use std::{
    convert::Infallible,
    sync::Arc,
    time::{Duration, Instant},
};

use axum::{
    Json, Router,
    extract::{Path, State},
    http::{
        HeaderMap, HeaderValue, StatusCode,
        header::{self, ACCEPT, AUTHORIZATION},
    },
    response::{
        IntoResponse, Response,
        sse::{Event, KeepAlive, Sse},
    },
    routing::get,
};
use base64::{Engine as _, engine::general_purpose::URL_SAFE_NO_PAD};
use crank_core::{
    AsyncJobHandle, AsyncJobId, InvocationLevel, InvocationLog, InvocationLogId, InvocationSource,
    InvocationStatus, JobStatus, PlatformApiKeyScope, StreamSession, StreamSessionId, StreamStatus,
};
use crank_registry::{
    CreateAsyncJobRequest, CreateInvocationLogRequest, CreateStreamSessionRequest,
    PostgresRegistry, PublishedAgentTool, UpdateAsyncJobStatusRequest,
    UpdateStreamSessionStateRequest,
};
use crank_runtime::{RuntimeError, RuntimeExecutor, RuntimeOperation};
use futures_util::stream;
use serde::{Deserialize, Serialize};
use serde_json::{Value, json};
use sha2::{Digest, Sha256};
use time::{OffsetDateTime, format_description::well_known::Rfc3339};

use crate::{
    catalog::PublishedToolCatalog,
    jsonrpc::{
        CURRENT_PROTOCOL_VERSION, DEFAULT_PROTOCOL_VERSION, is_notification, is_request,
        is_response, jsonrpc_error, jsonrpc_result, method_name, negotiated_protocol_version,
        params, request_id,
    },
    session::{SessionState, SessionStore},
};

const HEADER_MCP_SESSION_ID: &str = "MCP-Session-Id";
const HEADER_MCP_PROTOCOL_VERSION: &str = "MCP-Protocol-Version";

#[derive(Clone, Copy)]
enum ResponseMode {
    Json,
    Sse,
}

#[derive(Clone)]
pub struct AppState {
    registry: PostgresRegistry,
    catalog: PublishedToolCatalog,
    runtime: RuntimeExecutor,
    sessions: SessionStore,
    allowed_origins: AllowedOrigins,
}

#[derive(Clone)]
pub struct AllowedOrigins {
    public_origin: Option<String>,
}

#[derive(Debug, Serialize, Deserialize)]
struct InitializeParams {
    #[serde(rename = "protocolVersion")]
    protocol_version: String,
}

#[derive(Debug, Serialize, Deserialize)]
struct ToolCallParams {
    name: String,
    #[serde(default)]
    arguments: Value,
}

#[derive(Clone, Copy)]
enum GeneratedToolKind {
    Base,
    SessionStart,
    SessionPoll,
    SessionStop,
    AsyncJobStart,
    AsyncJobStatus,
    AsyncJobResult,
    AsyncJobCancel,
}

#[derive(Clone)]
struct ResolvedToolCall {
    tool: PublishedAgentTool,
    kind: GeneratedToolKind,
}

#[derive(Debug, Deserialize)]
struct SessionControlArgs {
    session_id: String,
}

#[derive(Debug, Deserialize)]
struct AsyncJobControlArgs {
    job_id: String,
}

#[derive(Clone, Debug, Deserialize)]
struct AgentRoutePath {
    workspace_slug: String,
    agent_slug: String,
}

pub fn build_app(
    registry: PostgresRegistry,
    refresh_interval: Duration,
    public_base_url: Option<String>,
) -> Router {
    let state = Arc::new(AppState {
        registry: registry.clone(),
        catalog: PublishedToolCatalog::new(registry, refresh_interval),
        runtime: RuntimeExecutor::new(),
        sessions: SessionStore::new(),
        allowed_origins: AllowedOrigins::new(public_base_url),
    });

    Router::new()
        .route("/health", get(health))
        .route(
            "/v1/{workspace_slug}/{agent_slug}",
            get(mcp_get).post(mcp_post).delete(mcp_delete),
        )
        .with_state(state)
}

async fn health() -> Json<Value> {
    Json(json!({
        "service": "mcp-server",
        "status": "ok"
    }))
}

async fn mcp_get(
    Path(path): Path<AgentRoutePath>,
    State(state): State<Arc<AppState>>,
    headers: HeaderMap,
) -> Response {
    if let Err(status) = validate_origin(&state.allowed_origins, &headers) {
        return status.into_response();
    }

    if let Err(status) = validate_get_accept_header(&headers) {
        return status.into_response();
    }

    if let Err(status) =
        require_platform_api_key(&state, &path, &headers, PlatformApiKeyScope::Read).await
    {
        return status.into_response();
    }

    let session_id = match session_id_from_headers(&headers) {
        Ok(Some(session_id)) => session_id,
        Ok(None) => return StatusCode::BAD_REQUEST.into_response(),
        Err(status) => return status.into_response(),
    };

    let Some(session) = state.sessions.get(&session_id).await else {
        return StatusCode::NOT_FOUND.into_response();
    };

    if session.workspace_slug != path.workspace_slug || session.agent_slug != path.agent_slug {
        return StatusCode::NOT_FOUND.into_response();
    }

    if !session.initialized {
        return StatusCode::BAD_REQUEST.into_response();
    }

    if let Err(status) = validate_session_protocol_version(&headers, &session.protocol_version) {
        return status.into_response();
    }

    sse_response(
        StatusCode::OK,
        stream::pending::<Result<Event, Infallible>>(),
        Some(&session_id),
        Some(&session.protocol_version),
    )
}

async fn mcp_delete(
    Path(path): Path<AgentRoutePath>,
    State(state): State<Arc<AppState>>,
    headers: HeaderMap,
) -> Response {
    if let Err(status) =
        require_platform_api_key(&state, &path, &headers, PlatformApiKeyScope::Read).await
    {
        return status.into_response();
    }

    match session_id_from_headers(&headers) {
        Ok(Some(session_id)) => match state.sessions.get(&session_id).await {
            Some(session)
                if session.workspace_slug == path.workspace_slug
                    && session.agent_slug == path.agent_slug =>
            {
                if state.sessions.delete(&session_id).await {
                    StatusCode::NO_CONTENT.into_response()
                } else {
                    StatusCode::NOT_FOUND.into_response()
                }
            }
            Some(_) => StatusCode::NOT_FOUND.into_response(),
            None => StatusCode::NOT_FOUND.into_response(),
        },
        Ok(None) => StatusCode::BAD_REQUEST.into_response(),
        Err(status) => status.into_response(),
    }
}

async fn mcp_post(
    Path(path): Path<AgentRoutePath>,
    State(state): State<Arc<AppState>>,
    headers: HeaderMap,
    Json(message): Json<Value>,
) -> Response {
    if let Err(status) = validate_origin(&state.allowed_origins, &headers) {
        return status.into_response();
    }

    let response_mode = match negotiate_post_response_mode(&headers) {
        Ok(mode) => mode,
        Err(status) => return status.into_response(),
    };

    if is_response(&message) || is_notification(&message) && method_name(&message).is_none() {
        return StatusCode::ACCEPTED.into_response();
    }

    let protocol_version = match protocol_version_from_headers(&headers) {
        Ok(value) => value,
        Err(status) => return status.into_response(),
    };

    if let Some(session_id) = headers.get(HEADER_MCP_SESSION_ID) {
        if let Ok(session_id) = session_id.to_str() {
            if let Some(session) = state.sessions.get(session_id).await {
                if let Err(status) =
                    validate_session_protocol_version(&headers, &session.protocol_version)
                {
                    return status.into_response();
                }
            }
        }
    }

    let required_scope = match method_name(&message) {
        Some("tools/call") => PlatformApiKeyScope::Write,
        _ => PlatformApiKeyScope::Read,
    };
    if let Err(status) = require_platform_api_key(&state, &path, &headers, required_scope).await {
        return status.into_response();
    }

    match method_name(&message) {
        Some("initialize") if is_request(&message) => {
            handle_initialize(state, &path, &message, response_mode).await
        }
        Some("notifications/initialized") if is_notification(&message) => {
            handle_initialized_notification(state, &path, &headers).await
        }
        Some("ping") if is_request(&message) => {
            let session = match require_initialized_session(&state, &path, &headers, &message).await
            {
                Ok(session) => session,
                Err(response) => return response,
            };

            transport_response(
                StatusCode::OK,
                jsonrpc_result(
                    request_id(&message),
                    json!({ "protocolVersion": session.protocol_version }),
                ),
                response_mode,
                None,
                Some(&session.protocol_version),
            )
        }
        Some("tools/list") if is_request(&message) => {
            let session = match require_initialized_session(&state, &path, &headers, &message).await
            {
                Ok(session) => session,
                Err(response) => return response,
            };

            match state
                .catalog
                .list_tools(&session.workspace_slug, &session.agent_slug)
                .await
            {
                Ok(tools) => {
                    let definitions = tools.iter().flat_map(tool_definitions).collect::<Vec<_>>();

                    transport_response(
                        StatusCode::OK,
                        jsonrpc_result(request_id(&message), json!({ "tools": definitions })),
                        response_mode,
                        None,
                        Some(&session.protocol_version),
                    )
                }
                Err(error) => internal_jsonrpc_error(&message, error),
            }
        }
        Some("tools/call") if is_request(&message) => {
            let session = match require_initialized_session(&state, &path, &headers, &message).await
            {
                Ok(session) => session,
                Err(response) => return response,
            };
            let tool_call_params: ToolCallParams = match serde_json::from_value(params(&message)) {
                Ok(value) => value,
                Err(error) => {
                    return transport_response(
                        StatusCode::OK,
                        jsonrpc_error(request_id(&message), -32602, error.to_string()),
                        response_mode,
                        None,
                        Some(&session.protocol_version),
                    );
                }
            };

            let arguments = if tool_call_params.arguments.is_null() {
                json!({})
            } else {
                tool_call_params.arguments
            };

            match state
                .catalog
                .list_tools(&session.workspace_slug, &session.agent_slug)
                .await
            {
                Ok(tools) => match resolve_generated_tool(&tools, &tool_call_params.name) {
                    Some(resolved) => {
                        handle_tool_call(
                            state.clone(),
                            &session,
                            &message,
                            response_mode,
                            resolved,
                            arguments,
                        )
                        .await
                    }
                    None => transport_response(
                        StatusCode::OK,
                        jsonrpc_error(
                            request_id(&message),
                            -32602,
                            format!("tool {} was not found", tool_call_params.name),
                        ),
                        response_mode,
                        None,
                        Some(&session.protocol_version),
                    ),
                },
                Err(error) => internal_jsonrpc_error(&message, error),
            }
        }
        Some(method) if is_notification(&message) => {
            let _ = method;
            StatusCode::ACCEPTED.into_response()
        }
        Some(method) => transport_response(
            StatusCode::OK,
            jsonrpc_error(
                request_id(&message),
                -32601,
                format!("method {method} is not supported"),
            ),
            response_mode,
            None,
            Some(&protocol_version),
        ),
        None => transport_response(
            StatusCode::BAD_REQUEST,
            jsonrpc_error(Value::Null, -32600, "invalid JSON-RPC message"),
            response_mode,
            None,
            Some(&protocol_version),
        ),
    }
}

async fn handle_tool_call(
    state: Arc<AppState>,
    session: &SessionState,
    message: &Value,
    response_mode: ResponseMode,
    resolved: ResolvedToolCall,
    arguments: Value,
) -> Response {
    match resolved.kind {
        GeneratedToolKind::Base => {
            handle_base_tool_call(
                state,
                session,
                message,
                response_mode,
                resolved.tool,
                arguments,
            )
            .await
        }
        GeneratedToolKind::SessionStart => {
            handle_session_start_call(
                state,
                session,
                message,
                response_mode,
                resolved.tool,
                arguments,
            )
            .await
        }
        GeneratedToolKind::SessionPoll => {
            handle_session_poll_call(
                state,
                session,
                message,
                response_mode,
                resolved.tool,
                arguments,
            )
            .await
        }
        GeneratedToolKind::SessionStop => {
            handle_session_stop_call(
                state,
                session,
                message,
                response_mode,
                resolved.tool,
                arguments,
            )
            .await
        }
        GeneratedToolKind::AsyncJobStart => {
            handle_async_job_start_call(
                state,
                session,
                message,
                response_mode,
                resolved.tool,
                arguments,
            )
            .await
        }
        GeneratedToolKind::AsyncJobStatus => {
            handle_async_job_status_call(
                state,
                session,
                message,
                response_mode,
                resolved.tool,
                arguments,
            )
            .await
        }
        GeneratedToolKind::AsyncJobResult => {
            handle_async_job_result_call(
                state,
                session,
                message,
                response_mode,
                resolved.tool,
                arguments,
            )
            .await
        }
        GeneratedToolKind::AsyncJobCancel => {
            handle_async_job_cancel_call(
                state,
                session,
                message,
                response_mode,
                resolved.tool,
                arguments,
            )
            .await
        }
    }
}

#[derive(Debug, Serialize, Deserialize)]
struct StoredSessionState {
    input: Value,
    summary: Value,
    items: Vec<Value>,
    next_index: usize,
    batch_size: usize,
}

async fn handle_base_tool_call(
    state: Arc<AppState>,
    session: &SessionState,
    message: &Value,
    response_mode: ResponseMode,
    tool: PublishedAgentTool,
    arguments: Value,
) -> Response {
    let operation = runtime_operation(&tool);
    let request_preview = build_request_preview(&state.runtime, &operation, &arguments);
    let started_at = Instant::now();
    let is_window_mode = matches!(
        operation
            .execution_config
            .streaming
            .as_ref()
            .map(|streaming| streaming.mode),
        Some(crank_core::ExecutionMode::Window)
    );

    let result = if is_window_mode {
        state
            .runtime
            .execute_window(&operation, &arguments)
            .await
            .map(|output| {
                json!({
                    "summary": output.summary,
                    "items": output.items,
                    "cursor": output.cursor,
                    "window_complete": output.window_complete,
                    "truncated": output.truncated,
                    "has_more": output.has_more,
                })
            })
    } else {
        state.runtime.execute(&operation, &arguments).await
    };

    match result {
        Ok(output) => {
            let _ = persist_invocation(
                &state,
                &tool,
                InvocationRecord {
                    tool_name: &tool.tool_name,
                    status: InvocationStatus::Ok,
                    level: InvocationLevel::Info,
                    message: "agent tool call completed",
                    status_code: None,
                    error_kind: None,
                    duration: started_at.elapsed(),
                    request_preview,
                    response_preview: output.clone(),
                },
            )
            .await;

            success_tool_response(message, response_mode, &session.protocol_version, output)
        }
        Err(error) => {
            let _ = persist_invocation(
                &state,
                &tool,
                InvocationRecord {
                    tool_name: &tool.tool_name,
                    status: InvocationStatus::Error,
                    level: InvocationLevel::Error,
                    message: &error.to_string(),
                    status_code: None,
                    error_kind: Some(runtime_error_code(&error)),
                    duration: started_at.elapsed(),
                    request_preview,
                    response_preview: Value::Null,
                },
            )
            .await;

            tool_error_response(
                message,
                response_mode,
                &session.protocol_version,
                runtime_error_code(&error),
                error.to_string(),
            )
        }
    }
}

async fn handle_session_start_call(
    state: Arc<AppState>,
    session: &SessionState,
    message: &Value,
    response_mode: ResponseMode,
    tool: PublishedAgentTool,
    arguments: Value,
) -> Response {
    let runtime_operation = runtime_operation(&tool);
    let request_preview = build_request_preview(&state.runtime, &runtime_operation, &arguments);
    let started_at = Instant::now();
    let Some(streaming) = runtime_operation.execution_config.streaming.as_ref() else {
        return tool_error_response(
            message,
            response_mode,
            &session.protocol_version,
            "streaming_config_error",
            "streaming config is required for session tools".to_owned(),
        );
    };

    match state
        .runtime
        .execute_session_seed(&runtime_operation, &arguments)
        .await
    {
        Ok(seed) => {
            let batch_size = streaming.max_items.unwrap_or(10).max(1) as usize;
            let preview_count = seed.items.len().min(batch_size);
            let preview_items = seed.items[..preview_count].to_vec();
            let next_index = preview_count;
            let session_id =
                StreamSessionId::new(format!("sess_{}", uuid::Uuid::now_v7().simple()));
            let now = now_rfc3339();
            let expires_at = add_millis(&now, streaming.max_session_lifetime_ms.unwrap_or(60_000));
            let session_record = StreamSession {
                id: session_id.clone(),
                workspace_id: tool.workspace_id.clone(),
                agent_id: Some(tool.agent_id.clone()),
                operation_id: tool.operation.id.clone(),
                protocol: tool.operation.protocol,
                mode: crank_core::ExecutionMode::Session,
                status: StreamStatus::Running,
                cursor: (next_index < seed.items.len()).then(|| json!(next_index)),
                state: json!(StoredSessionState {
                    input: arguments.clone(),
                    summary: seed.summary.clone(),
                    items: seed.items.clone(),
                    next_index,
                    batch_size,
                }),
                expires_at: expires_at.clone(),
                last_poll_at: Some(now.clone()),
                created_at: now.clone(),
                closed_at: None,
            };

            if let Err(error) = state
                .registry
                .create_stream_session(CreateStreamSessionRequest {
                    session: &session_record,
                })
                .await
            {
                return internal_jsonrpc_error(message, error);
            }

            let output = json!({
                "session_id": session_id.as_str(),
                "status": "running",
                "expires_at": expires_at,
                "poll_after_ms": streaming.poll_interval_ms.unwrap_or(1000),
                "preview": {
                    "summary": seed.summary,
                    "items": preview_items,
                }
            });

            let _ = persist_invocation(
                &state,
                &tool,
                InvocationRecord {
                    tool_name: streaming
                        .tool_family
                        .start_tool_name
                        .as_deref()
                        .unwrap_or(&tool.tool_name),
                    status: InvocationStatus::Ok,
                    level: InvocationLevel::Info,
                    message: "stream session started",
                    status_code: None,
                    error_kind: None,
                    duration: started_at.elapsed(),
                    request_preview,
                    response_preview: output.clone(),
                },
            )
            .await;

            success_tool_response(message, response_mode, &session.protocol_version, output)
        }
        Err(error) => {
            let _ = persist_invocation(
                &state,
                &tool,
                InvocationRecord {
                    tool_name: streaming
                        .tool_family
                        .start_tool_name
                        .as_deref()
                        .unwrap_or(&tool.tool_name),
                    status: InvocationStatus::Error,
                    level: InvocationLevel::Error,
                    message: &error.to_string(),
                    status_code: None,
                    error_kind: Some(runtime_error_code(&error)),
                    duration: started_at.elapsed(),
                    request_preview,
                    response_preview: Value::Null,
                },
            )
            .await;

            tool_error_response(
                message,
                response_mode,
                &session.protocol_version,
                runtime_error_code(&error),
                error.to_string(),
            )
        }
    }
}

async fn handle_session_poll_call(
    state: Arc<AppState>,
    session: &SessionState,
    message: &Value,
    response_mode: ResponseMode,
    tool: PublishedAgentTool,
    arguments: Value,
) -> Response {
    let control: SessionControlArgs = match serde_json::from_value(arguments.clone()) {
        Ok(value) => value,
        Err(error) => {
            return transport_response(
                StatusCode::OK,
                jsonrpc_error(request_id(message), -32602, error.to_string()),
                response_mode,
                None,
                Some(&session.protocol_version),
            );
        }
    };

    let Some(streaming) = tool.operation.execution_config.streaming.as_ref() else {
        return tool_error_response(
            message,
            response_mode,
            &session.protocol_version,
            "streaming_config_error",
            "streaming config is required for session tools".to_owned(),
        );
    };

    let now = now_rfc3339();
    let loaded = match state
        .registry
        .get_stream_session(&StreamSessionId::new(control.session_id.clone()))
        .await
    {
        Ok(Some(session_record)) => session_record,
        Ok(None) => {
            return tool_error_response(
                message,
                response_mode,
                &session.protocol_version,
                "stream_session_not_found",
                format!("stream session {} was not found", control.session_id),
            );
        }
        Err(error) => return internal_jsonrpc_error(message, error),
    };

    if loaded.is_expired(&now) {
        let _ = state
            .registry
            .update_stream_session_state(UpdateStreamSessionStateRequest {
                session_id: &loaded.id,
                current_status: loaded.status,
                next_status: StreamStatus::Expired,
                cursor: loaded.cursor.as_ref(),
                state: &loaded.state,
                expires_at: None,
                last_poll_at: Some(&now),
                closed_at: Some(&now),
            })
            .await;

        return tool_error_response(
            message,
            response_mode,
            &session.protocol_version,
            "stream_session_expired",
            format!("stream session {} has expired", control.session_id),
        );
    }

    if !loaded.can_poll(&now) {
        return tool_error_response(
            message,
            response_mode,
            &session.protocol_version,
            "stream_session_not_found",
            format!("stream session {} is not running", control.session_id),
        );
    }

    let mut state_payload: StoredSessionState = match serde_json::from_value(loaded.state.clone()) {
        Ok(value) => value,
        Err(error) => {
            return tool_error_response(
                message,
                response_mode,
                &session.protocol_version,
                "streaming_payload_error",
                error.to_string(),
            );
        }
    };

    let next_end =
        (state_payload.next_index + state_payload.batch_size).min(state_payload.items.len());
    let items = state_payload.items[state_payload.next_index..next_end].to_vec();
    state_payload.next_index = next_end;
    let has_more = state_payload.next_index < state_payload.items.len();
    let next_status = if has_more {
        StreamStatus::Running
    } else {
        StreamStatus::Stopped
    };
    let cursor = has_more.then(|| json!(state_payload.next_index));

    let updated = match state
        .registry
        .update_stream_session_state(UpdateStreamSessionStateRequest {
            session_id: &loaded.id,
            current_status: loaded.status,
            next_status,
            cursor: cursor.as_ref(),
            state: &json!(state_payload),
            expires_at: Some(&add_millis(
                &now,
                streaming.max_session_lifetime_ms.unwrap_or(60_000),
            )),
            last_poll_at: Some(&now),
            closed_at: matches!(next_status, StreamStatus::Stopped).then_some(now.as_str()),
        })
        .await
    {
        Ok(session_record) => session_record,
        Err(error) => return internal_jsonrpc_error(message, error),
    };

    let output = json!({
        "session_id": updated.id.as_str(),
        "status": serialize_stream_status(updated.status),
        "expires_at": updated.expires_at,
        "summary": serde_json::from_value::<StoredSessionState>(updated.state.clone()).map(|value| value.summary).unwrap_or(Value::Null),
        "items": items,
        "cursor": updated.cursor,
        "has_more": updated.status == StreamStatus::Running,
    });

    let _ = persist_invocation(
        &state,
        &tool,
        InvocationRecord {
            tool_name: streaming
                .tool_family
                .poll_tool_name
                .as_deref()
                .unwrap_or(&tool.tool_name),
            status: InvocationStatus::Ok,
            level: InvocationLevel::Info,
            message: "stream session polled",
            status_code: None,
            error_kind: None,
            duration: Duration::ZERO,
            request_preview: json!({ "session_id": control.session_id }),
            response_preview: output.clone(),
        },
    )
    .await;

    success_tool_response(message, response_mode, &session.protocol_version, output)
}

async fn handle_session_stop_call(
    state: Arc<AppState>,
    session: &SessionState,
    message: &Value,
    response_mode: ResponseMode,
    _tool: PublishedAgentTool,
    arguments: Value,
) -> Response {
    let control: SessionControlArgs = match serde_json::from_value(arguments.clone()) {
        Ok(value) => value,
        Err(error) => {
            return transport_response(
                StatusCode::OK,
                jsonrpc_error(request_id(message), -32602, error.to_string()),
                response_mode,
                None,
                Some(&session.protocol_version),
            );
        }
    };

    match state
        .registry
        .close_stream_session(
            &StreamSessionId::new(control.session_id.clone()),
            &now_rfc3339(),
        )
        .await
    {
        Ok(()) => success_tool_response(
            message,
            response_mode,
            &session.protocol_version,
            json!({
                "session_id": control.session_id,
                "status": "stopped"
            }),
        ),
        Err(error) => internal_jsonrpc_error(message, error),
    }
}

async fn handle_async_job_start_call(
    state: Arc<AppState>,
    session: &SessionState,
    message: &Value,
    response_mode: ResponseMode,
    tool: PublishedAgentTool,
    arguments: Value,
) -> Response {
    let operation = runtime_operation(&tool);
    let request_preview = build_request_preview(&state.runtime, &operation, &arguments);
    let Some(streaming) = tool.operation.execution_config.streaming.as_ref() else {
        return tool_error_response(
            message,
            response_mode,
            &session.protocol_version,
            "streaming_config_error",
            "streaming config is required for async job tools".to_owned(),
        );
    };

    let now = now_rfc3339();
    let job = AsyncJobHandle {
        id: AsyncJobId::new(format!("job_{}", uuid::Uuid::now_v7().simple())),
        workspace_id: tool.workspace_id.clone(),
        agent_id: Some(tool.agent_id.clone()),
        operation_id: tool.operation.id.clone(),
        status: JobStatus::Running,
        progress: json!({ "pct": 0 }),
        result: None,
        error: None,
        expires_at: Some(add_millis(&now, 300_000)),
        created_at: now.clone(),
        updated_at: now.clone(),
        finished_at: None,
    };

    if let Err(error) = state
        .registry
        .create_async_job(CreateAsyncJobRequest { job: &job })
        .await
    {
        return internal_jsonrpc_error(message, error);
    }

    let registry = state.registry.clone();
    let tool_for_task = tool.clone();
    let arguments_for_task = arguments.clone();
    let job_id = job.id.clone();
    tokio::spawn(async move {
        let runtime = RuntimeExecutor::new();
        let task_operation = runtime_operation(&tool_for_task);
        let result = runtime.execute(&task_operation, &arguments_for_task).await;
        let finished_at = now_rfc3339();

        let update_result = match result {
            Ok(output) => {
                registry
                    .update_async_job_status(UpdateAsyncJobStatusRequest {
                        job_id: &job_id,
                        current_status: JobStatus::Running,
                        next_status: JobStatus::Completed,
                        progress: &json!({ "pct": 100 }),
                        result: Some(&output),
                        error: None,
                        expires_at: None,
                        updated_at: &finished_at,
                        finished_at: Some(&finished_at),
                    })
                    .await
            }
            Err(error) => {
                registry
                    .update_async_job_status(UpdateAsyncJobStatusRequest {
                        job_id: &job_id,
                        current_status: JobStatus::Running,
                        next_status: JobStatus::Failed,
                        progress: &json!({ "pct": 100 }),
                        result: None,
                        error: Some(&json!({
                            "code": runtime_error_code(&error),
                            "message": error.to_string()
                        })),
                        expires_at: None,
                        updated_at: &finished_at,
                        finished_at: Some(&finished_at),
                    })
                    .await
            }
        };

        let _ = update_result;
    });

    let output = json!({
        "job_id": job.id.as_str(),
        "status": "running",
        "progress": job.progress,
    });

    let _ = persist_invocation(
        &state,
        &tool,
        InvocationRecord {
            tool_name: streaming
                .tool_family
                .start_tool_name
                .as_deref()
                .unwrap_or(&tool.tool_name),
            status: InvocationStatus::Ok,
            level: InvocationLevel::Info,
            message: "async job started",
            status_code: None,
            error_kind: None,
            duration: Duration::ZERO,
            request_preview,
            response_preview: output.clone(),
        },
    )
    .await;

    success_tool_response(message, response_mode, &session.protocol_version, output)
}

async fn handle_async_job_status_call(
    state: Arc<AppState>,
    session: &SessionState,
    message: &Value,
    response_mode: ResponseMode,
    _tool: PublishedAgentTool,
    arguments: Value,
) -> Response {
    let control: AsyncJobControlArgs = match serde_json::from_value(arguments.clone()) {
        Ok(value) => value,
        Err(error) => {
            return transport_response(
                StatusCode::OK,
                jsonrpc_error(request_id(message), -32602, error.to_string()),
                response_mode,
                None,
                Some(&session.protocol_version),
            );
        }
    };

    let job = match state
        .registry
        .get_async_job(&AsyncJobId::new(control.job_id.clone()))
        .await
    {
        Ok(Some(job)) => job,
        Ok(None) => {
            return tool_error_response(
                message,
                response_mode,
                &session.protocol_version,
                "async_job_not_found",
                format!("async job {} was not found", control.job_id),
            );
        }
        Err(error) => return internal_jsonrpc_error(message, error),
    };

    success_tool_response(
        message,
        response_mode,
        &session.protocol_version,
        json!({
            "job_id": job.id.as_str(),
            "status": serialize_job_status(job.status),
            "progress": job.progress,
            "updated_at": job.updated_at,
            "finished_at": job.finished_at,
        }),
    )
}

async fn handle_async_job_result_call(
    state: Arc<AppState>,
    session: &SessionState,
    message: &Value,
    response_mode: ResponseMode,
    _tool: PublishedAgentTool,
    arguments: Value,
) -> Response {
    let control: AsyncJobControlArgs = match serde_json::from_value(arguments.clone()) {
        Ok(value) => value,
        Err(error) => {
            return transport_response(
                StatusCode::OK,
                jsonrpc_error(request_id(message), -32602, error.to_string()),
                response_mode,
                None,
                Some(&session.protocol_version),
            );
        }
    };

    let job = match state
        .registry
        .get_async_job(&AsyncJobId::new(control.job_id.clone()))
        .await
    {
        Ok(Some(job)) => job,
        Ok(None) => {
            return tool_error_response(
                message,
                response_mode,
                &session.protocol_version,
                "async_job_not_found",
                format!("async job {} was not found", control.job_id),
            );
        }
        Err(error) => return internal_jsonrpc_error(message, error),
    };

    match job.status {
        JobStatus::Completed => success_tool_response(
            message,
            response_mode,
            &session.protocol_version,
            job.result.unwrap_or(Value::Null),
        ),
        JobStatus::Failed => tool_error_response(
            message,
            response_mode,
            &session.protocol_version,
            "async_job_failed",
            job.error
                .and_then(|value| value.get("message").cloned())
                .and_then(|value| value.as_str().map(ToOwned::to_owned))
                .unwrap_or_else(|| "async job failed".to_owned()),
        ),
        JobStatus::Cancelled => tool_error_response(
            message,
            response_mode,
            &session.protocol_version,
            "async_job_cancelled",
            "async job was cancelled".to_owned(),
        ),
        _ => tool_error_response(
            message,
            response_mode,
            &session.protocol_version,
            "async_job_not_ready",
            "async job result is not ready".to_owned(),
        ),
    }
}

async fn handle_async_job_cancel_call(
    state: Arc<AppState>,
    session: &SessionState,
    message: &Value,
    response_mode: ResponseMode,
    _tool: PublishedAgentTool,
    arguments: Value,
) -> Response {
    let control: AsyncJobControlArgs = match serde_json::from_value(arguments.clone()) {
        Ok(value) => value,
        Err(error) => {
            return transport_response(
                StatusCode::OK,
                jsonrpc_error(request_id(message), -32602, error.to_string()),
                response_mode,
                None,
                Some(&session.protocol_version),
            );
        }
    };

    match state
        .registry
        .cancel_async_job(&AsyncJobId::new(control.job_id.clone()), &now_rfc3339())
        .await
    {
        Ok(()) => success_tool_response(
            message,
            response_mode,
            &session.protocol_version,
            json!({
                "job_id": control.job_id,
                "status": "cancelled"
            }),
        ),
        Err(error) => internal_jsonrpc_error(message, error),
    }
}

async fn handle_initialize(
    state: Arc<AppState>,
    path: &AgentRoutePath,
    message: &Value,
    response_mode: ResponseMode,
) -> Response {
    let initialize_params: InitializeParams = match serde_json::from_value(params(message)) {
        Ok(value) => value,
        Err(error) => {
            return transport_response(
                StatusCode::OK,
                jsonrpc_error(request_id(message), -32602, error.to_string()),
                response_mode,
                None,
                Some(DEFAULT_PROTOCOL_VERSION),
            );
        }
    };
    let Some(protocol_version) = negotiated_protocol_version(&initialize_params.protocol_version)
    else {
        return transport_response(
            StatusCode::OK,
            jsonrpc_error(
                request_id(message),
                -32602,
                format!(
                    "unsupported protocol version {}",
                    initialize_params.protocol_version
                ),
            ),
            response_mode,
            None,
            Some(DEFAULT_PROTOCOL_VERSION),
        );
    };
    let session_id = state
        .sessions
        .create(protocol_version, &path.workspace_slug, &path.agent_slug)
        .await;

    transport_response(
        StatusCode::OK,
        jsonrpc_result(
            request_id(message),
            json!({
                "protocolVersion": protocol_version,
                "capabilities": {
                    "tools": {
                        "listChanged": false
                    }
                },
                "serverInfo": {
                    "name": "crank-mcp-server",
                    "version": env!("CARGO_PKG_VERSION")
                }
            }),
        ),
        response_mode,
        Some(&session_id),
        Some(protocol_version),
    )
}

async fn handle_initialized_notification(
    state: Arc<AppState>,
    path: &AgentRoutePath,
    headers: &HeaderMap,
) -> Response {
    match session_id_from_headers(headers) {
        Ok(Some(session_id)) => match state.sessions.get(&session_id).await {
            Some(session)
                if session.workspace_slug == path.workspace_slug
                    && session.agent_slug == path.agent_slug =>
            {
                if state.sessions.mark_initialized(&session_id).await {
                    StatusCode::ACCEPTED.into_response()
                } else {
                    StatusCode::NOT_FOUND.into_response()
                }
            }
            Some(_) => StatusCode::NOT_FOUND.into_response(),
            None => StatusCode::NOT_FOUND.into_response(),
        },
        Ok(None) => StatusCode::BAD_REQUEST.into_response(),
        Err(status) => status.into_response(),
    }
}

async fn require_initialized_session(
    state: &Arc<AppState>,
    path: &AgentRoutePath,
    headers: &HeaderMap,
    message: &Value,
) -> Result<SessionState, Response> {
    let session_id = match session_id_from_headers(headers) {
        Ok(Some(session_id)) => session_id,
        Ok(None) => return Err(StatusCode::BAD_REQUEST.into_response()),
        Err(status) => return Err(status.into_response()),
    };

    let Some(session) = state.sessions.get(&session_id).await else {
        return Err(StatusCode::NOT_FOUND.into_response());
    };

    if session.workspace_slug != path.workspace_slug || session.agent_slug != path.agent_slug {
        return Err(StatusCode::NOT_FOUND.into_response());
    }

    if !session.initialized {
        return Err(json_response(
            StatusCode::OK,
            jsonrpc_error(request_id(message), -32002, "session is not initialized"),
            None,
            Some(&session.protocol_version),
        ));
    }

    Ok(session)
}

async fn require_platform_api_key(
    state: &Arc<AppState>,
    path: &AgentRoutePath,
    headers: &HeaderMap,
    required_scope: PlatformApiKeyScope,
) -> Result<(), StatusCode> {
    let secret = bearer_token(headers).ok_or(StatusCode::UNAUTHORIZED)?;
    let secret_hash = hash_access_secret(secret);
    let Some(api_key) = state
        .registry
        .get_platform_api_key_by_secret_for_workspace_slug(&path.workspace_slug, &secret_hash)
        .await
        .map_err(|_| StatusCode::INTERNAL_SERVER_ERROR)?
    else {
        return Err(StatusCode::UNAUTHORIZED);
    };

    if !allows_scope(&api_key.api_key.scopes, required_scope) {
        return Err(StatusCode::FORBIDDEN);
    }

    let used_at = OffsetDateTime::now_utc()
        .format(&Rfc3339)
        .map_err(|_| StatusCode::INTERNAL_SERVER_ERROR)?;
    state
        .registry
        .touch_platform_api_key(&api_key.api_key.workspace_id, &api_key.api_key.id, &used_at)
        .await
        .map_err(|_| StatusCode::INTERNAL_SERVER_ERROR)?;

    Ok(())
}

fn bearer_token(headers: &HeaderMap) -> Option<&str> {
    let value = headers.get(AUTHORIZATION)?.to_str().ok()?;
    let (scheme, token) = value.split_once(' ')?;
    if !scheme.eq_ignore_ascii_case("Bearer") || token.is_empty() {
        return None;
    }

    Some(token)
}

fn allows_scope(scopes: &[PlatformApiKeyScope], required_scope: PlatformApiKeyScope) -> bool {
    match required_scope {
        PlatformApiKeyScope::Read => scopes.iter().any(|scope| {
            matches!(
                scope,
                PlatformApiKeyScope::Read
                    | PlatformApiKeyScope::Write
                    | PlatformApiKeyScope::Deploy
            )
        }),
        PlatformApiKeyScope::Write => scopes.iter().any(|scope| {
            matches!(
                scope,
                PlatformApiKeyScope::Write | PlatformApiKeyScope::Deploy
            )
        }),
        PlatformApiKeyScope::Deploy => scopes
            .iter()
            .any(|scope| matches!(scope, PlatformApiKeyScope::Deploy)),
    }
}

fn validate_origin(
    allowed_origins: &AllowedOrigins,
    headers: &HeaderMap,
) -> Result<(), StatusCode> {
    let Some(origin) = headers.get(header::ORIGIN) else {
        return Ok(());
    };
    let Ok(origin) = origin.to_str() else {
        return Err(StatusCode::FORBIDDEN);
    };

    if allowed_origins.is_allowed(origin) {
        return Ok(());
    }

    Err(StatusCode::FORBIDDEN)
}

fn negotiate_post_response_mode(headers: &HeaderMap) -> Result<ResponseMode, StatusCode> {
    let Some(accept) = headers.get(ACCEPT) else {
        return Err(StatusCode::BAD_REQUEST);
    };
    let Ok(accept) = accept.to_str() else {
        return Err(StatusCode::BAD_REQUEST);
    };

    let mut saw_json = false;
    let mut saw_sse = false;
    let mut preferred = None;

    for part in accept.split(',') {
        let media_type = part
            .split(';')
            .next()
            .unwrap_or_default()
            .trim()
            .to_ascii_lowercase();

        match media_type.as_str() {
            "application/json" => {
                saw_json = true;
                if preferred.is_none() {
                    preferred = Some(ResponseMode::Json);
                }
            }
            "text/event-stream" => {
                saw_sse = true;
                if preferred.is_none() {
                    preferred = Some(ResponseMode::Sse);
                }
            }
            _ => {}
        }
    }

    if saw_json && saw_sse {
        return preferred.ok_or(StatusCode::NOT_ACCEPTABLE);
    }

    Err(StatusCode::NOT_ACCEPTABLE)
}

fn validate_get_accept_header(headers: &HeaderMap) -> Result<(), StatusCode> {
    let Some(accept) = headers.get(ACCEPT) else {
        return Err(StatusCode::BAD_REQUEST);
    };
    let Ok(accept) = accept.to_str() else {
        return Err(StatusCode::BAD_REQUEST);
    };

    if accept
        .split(',')
        .map(|part| {
            part.split(';')
                .next()
                .unwrap_or_default()
                .trim()
                .to_ascii_lowercase()
        })
        .any(|media_type| media_type == "text/event-stream")
    {
        return Ok(());
    }

    Err(StatusCode::NOT_ACCEPTABLE)
}

fn protocol_version_from_headers(headers: &HeaderMap) -> Result<String, StatusCode> {
    let Some(version) = headers.get(HEADER_MCP_PROTOCOL_VERSION) else {
        return Ok(DEFAULT_PROTOCOL_VERSION.to_owned());
    };
    let Ok(version) = version.to_str() else {
        return Err(StatusCode::BAD_REQUEST);
    };

    if negotiated_protocol_version(version).is_some() {
        return Ok(version.to_owned());
    }

    Err(StatusCode::BAD_REQUEST)
}

fn validate_session_protocol_version(
    headers: &HeaderMap,
    negotiated_session_version: &str,
) -> Result<(), StatusCode> {
    let Some(version) = headers.get(HEADER_MCP_PROTOCOL_VERSION) else {
        return Ok(());
    };
    let Ok(version) = version.to_str() else {
        return Err(StatusCode::BAD_REQUEST);
    };

    if negotiated_protocol_version(version).is_none() {
        return Err(StatusCode::BAD_REQUEST);
    }

    if version != negotiated_session_version {
        return Err(StatusCode::BAD_REQUEST);
    }

    Ok(())
}

fn session_id_from_headers(headers: &HeaderMap) -> Result<Option<String>, StatusCode> {
    let Some(session_id) = headers.get(HEADER_MCP_SESSION_ID) else {
        return Ok(None);
    };
    let Ok(session_id) = session_id.to_str() else {
        return Err(StatusCode::BAD_REQUEST);
    };

    Ok(Some(session_id.to_owned()))
}

fn internal_jsonrpc_error(message: &Value, error: impl std::fmt::Display) -> Response {
    transport_response(
        StatusCode::INTERNAL_SERVER_ERROR,
        jsonrpc_error(request_id(message), -32603, error.to_string()),
        ResponseMode::Json,
        None,
        Some(DEFAULT_PROTOCOL_VERSION),
    )
}

fn build_request_preview(
    runtime: &RuntimeExecutor,
    operation: &RuntimeOperation,
    arguments: &Value,
) -> Value {
    match runtime.prepare_request(operation, arguments) {
        Ok(prepared) => json!({
            "path": prepared.path_params,
            "query": prepared.query_params,
            "headers": prepared.headers,
            "grpc": prepared.grpc.unwrap_or(Value::Null),
            "variables": prepared.variables.unwrap_or(Value::Null),
            "body": prepared.body.unwrap_or(Value::Null)
        }),
        Err(_) => Value::Null,
    }
}

struct InvocationRecord<'a> {
    tool_name: &'a str,
    status: InvocationStatus,
    level: InvocationLevel,
    message: &'a str,
    status_code: Option<u16>,
    error_kind: Option<&'a str>,
    duration: Duration,
    request_preview: Value,
    response_preview: Value,
}

async fn persist_invocation(
    state: &Arc<AppState>,
    tool: &PublishedAgentTool,
    record: InvocationRecord<'_>,
) -> Result<(), crank_registry::RegistryError> {
    let created_at = OffsetDateTime::now_utc()
        .format(&Rfc3339)
        .unwrap_or_else(|_| "1970-01-01T00:00:00Z".to_owned());
    let duration_ms = u64::try_from(record.duration.as_millis()).unwrap_or(u64::MAX);
    let log = InvocationLog {
        id: InvocationLogId::new(format!("log_{}", uuid::Uuid::now_v7().simple())),
        workspace_id: tool.workspace_id.clone(),
        agent_id: Some(tool.agent_id.clone()),
        operation_id: tool.operation.id.clone(),
        source: InvocationSource::AgentToolCall,
        level: record.level,
        status: record.status,
        tool_name: record.tool_name.to_owned(),
        message: record.message.to_owned(),
        request_id: None,
        status_code: record.status_code,
        duration_ms,
        error_kind: record.error_kind.map(ToOwned::to_owned),
        request_preview: record.request_preview,
        response_preview: record.response_preview,
        created_at,
    };

    state
        .registry
        .create_invocation_log(CreateInvocationLogRequest { log: &log })
        .await
}

fn success_tool_response(
    message: &Value,
    response_mode: ResponseMode,
    protocol_version: &str,
    output: Value,
) -> Response {
    transport_response(
        StatusCode::OK,
        jsonrpc_result(
            request_id(message),
            json!({
                "content": [
                    {
                        "type": "text",
                        "text": serde_json::to_string_pretty(&output).unwrap_or_else(|_| "{}".to_owned())
                    }
                ],
                "structuredContent": output,
                "isError": false
            }),
        ),
        response_mode,
        None,
        Some(protocol_version),
    )
}

fn tool_error_response(
    message: &Value,
    response_mode: ResponseMode,
    protocol_version: &str,
    code: &str,
    error_message: String,
) -> Response {
    transport_response(
        StatusCode::OK,
        jsonrpc_result(
            request_id(message),
            json!({
                "content": [
                    {
                        "type": "text",
                        "text": error_message
                    }
                ],
                "structuredContent": {
                    "error": {
                        "code": code,
                        "message": error_message
                    }
                },
                "isError": true
            }),
        ),
        response_mode,
        None,
        Some(protocol_version),
    )
}

fn now_rfc3339() -> String {
    OffsetDateTime::now_utc()
        .format(&Rfc3339)
        .unwrap_or_else(|_| "1970-01-01T00:00:00Z".to_owned())
}

fn add_millis(timestamp: &str, millis: u64) -> String {
    let Ok(parsed) = OffsetDateTime::parse(timestamp, &Rfc3339) else {
        return timestamp.to_owned();
    };
    let delta = time::Duration::milliseconds(i64::try_from(millis).unwrap_or(i64::MAX));

    (parsed + delta)
        .format(&Rfc3339)
        .unwrap_or_else(|_| timestamp.to_owned())
}

fn serialize_stream_status(status: StreamStatus) -> &'static str {
    match status {
        StreamStatus::Created => "created",
        StreamStatus::Running => "running",
        StreamStatus::Stopped => "stopped",
        StreamStatus::Failed => "failed",
        StreamStatus::Expired => "expired",
    }
}

fn serialize_job_status(status: JobStatus) -> &'static str {
    match status {
        JobStatus::Created => "created",
        JobStatus::Running => "running",
        JobStatus::Completed => "completed",
        JobStatus::Failed => "failed",
        JobStatus::Cancelled => "cancelled",
        JobStatus::Expired => "expired",
    }
}

fn runtime_error_code(error: &RuntimeError) -> &'static str {
    match error {
        RuntimeError::Schema(_) => "schema_validation_error",
        RuntimeError::Mapping(_) => "mapping_error",
        RuntimeError::GraphqlAdapter(_) => "adapter_execution_error",
        RuntimeError::GrpcAdapter(_) => "adapter_execution_error",
        RuntimeError::RestAdapter(_) => "adapter_execution_error",
        RuntimeError::UnsupportedProtocol { .. } => "unsupported_protocol",
        RuntimeError::MissingStreamingConfig { .. } => "streaming_config_error",
        RuntimeError::UnsupportedExecutionMode { .. } => "streaming_mode_error",
        RuntimeError::InvalidPreparedRequest { .. } => "runtime_error",
        RuntimeError::InvalidStreamingPayload { .. } => "streaming_payload_error",
    }
}

fn hash_access_secret(secret: &str) -> String {
    let digest = Sha256::digest(secret.as_bytes());
    URL_SAFE_NO_PAD.encode(digest)
}

fn json_response(
    status: StatusCode,
    payload: Value,
    session_id: Option<&str>,
    protocol_version: Option<&str>,
) -> Response {
    let mut response = (status, Json(payload)).into_response();

    if let Some(session_id) = session_id {
        response.headers_mut().insert(
            HEADER_MCP_SESSION_ID,
            HeaderValue::from_str(session_id)
                .unwrap_or_else(|_| HeaderValue::from_static("invalid")),
        );
    }

    if let Some(protocol_version) = protocol_version {
        response.headers_mut().insert(
            HEADER_MCP_PROTOCOL_VERSION,
            HeaderValue::from_str(protocol_version)
                .unwrap_or_else(|_| HeaderValue::from_static(CURRENT_PROTOCOL_VERSION)),
        );
    }

    response
}

fn transport_response(
    status: StatusCode,
    payload: Value,
    response_mode: ResponseMode,
    session_id: Option<&str>,
    protocol_version: Option<&str>,
) -> Response {
    if status == StatusCode::OK && matches!(response_mode, ResponseMode::Sse) {
        let payload = payload.to_string();
        let stream = stream::once(async move { Ok(Event::default().data(payload)) });

        return sse_response(status, stream, session_id, protocol_version);
    }

    json_response(status, payload, session_id, protocol_version)
}

fn sse_response<S>(
    status: StatusCode,
    stream: S,
    session_id: Option<&str>,
    protocol_version: Option<&str>,
) -> Response
where
    S: futures_util::stream::Stream<Item = Result<Event, Infallible>> + Send + 'static,
{
    let mut response = (
        status,
        Sse::new(stream).keep_alive(KeepAlive::new().interval(Duration::from_secs(15))),
    )
        .into_response();

    if let Some(session_id) = session_id {
        response.headers_mut().insert(
            HEADER_MCP_SESSION_ID,
            HeaderValue::from_str(session_id)
                .unwrap_or_else(|_| HeaderValue::from_static("invalid")),
        );
    }

    if let Some(protocol_version) = protocol_version {
        response.headers_mut().insert(
            HEADER_MCP_PROTOCOL_VERSION,
            HeaderValue::from_str(protocol_version)
                .unwrap_or_else(|_| HeaderValue::from_static(CURRENT_PROTOCOL_VERSION)),
        );
    }

    response
}

fn tool_definitions(tool: &PublishedAgentTool) -> Vec<Value> {
    let mut definitions = Vec::new();
    let operation = &tool.operation;

    match operation
        .execution_config
        .streaming
        .as_ref()
        .map(|value| value.mode)
    {
        Some(crank_core::ExecutionMode::Session) => {
            let streaming = operation
                .execution_config
                .streaming
                .as_ref()
                .expect("streaming");
            if let (Some(start), Some(poll), Some(stop)) = (
                streaming.tool_family.start_tool_name.as_ref(),
                streaming.tool_family.poll_tool_name.as_ref(),
                streaming.tool_family.stop_tool_name.as_ref(),
            ) {
                definitions.push(tool_definition(
                    start,
                    &format!("{} Start", tool.tool_title),
                    &format!("Start session for {}", tool.tool_description),
                    schema_to_json_schema(&operation.input_schema),
                ));
                definitions.push(tool_definition(
                    poll,
                    &format!("{} Poll", tool.tool_title),
                    &format!("Poll session for {}", tool.tool_description),
                    id_input_schema("session_id"),
                ));
                definitions.push(tool_definition(
                    stop,
                    &format!("{} Stop", tool.tool_title),
                    &format!("Stop session for {}", tool.tool_description),
                    id_input_schema("session_id"),
                ));
            }
        }
        Some(crank_core::ExecutionMode::AsyncJob) => {
            let streaming = operation
                .execution_config
                .streaming
                .as_ref()
                .expect("streaming");
            if let (Some(start), Some(status), Some(result), Some(cancel)) = (
                streaming.tool_family.start_tool_name.as_ref(),
                streaming.tool_family.status_tool_name.as_ref(),
                streaming.tool_family.result_tool_name.as_ref(),
                streaming.tool_family.cancel_tool_name.as_ref(),
            ) {
                definitions.push(tool_definition(
                    start,
                    &format!("{} Start", tool.tool_title),
                    &format!("Start async job for {}", tool.tool_description),
                    schema_to_json_schema(&operation.input_schema),
                ));
                definitions.push(tool_definition(
                    status,
                    &format!("{} Status", tool.tool_title),
                    &format!("Get job status for {}", tool.tool_description),
                    id_input_schema("job_id"),
                ));
                definitions.push(tool_definition(
                    result,
                    &format!("{} Result", tool.tool_title),
                    &format!("Get async job result for {}", tool.tool_description),
                    id_input_schema("job_id"),
                ));
                definitions.push(tool_definition(
                    cancel,
                    &format!("{} Cancel", tool.tool_title),
                    &format!("Cancel async job for {}", tool.tool_description),
                    id_input_schema("job_id"),
                ));
            }
        }
        _ => {
            definitions.push(tool_definition(
                &tool.tool_name,
                &tool.tool_title,
                &tool.tool_description,
                schema_to_json_schema(&operation.input_schema),
            ));
        }
    }

    definitions
}

fn tool_definition(name: &str, title: &str, description: &str, input_schema: Value) -> Value {
    json!({
        "name": name,
        "title": title,
        "description": description,
        "inputSchema": input_schema
    })
}

fn id_input_schema(field_name: &str) -> Value {
    json!({
        "type": "object",
        "properties": {
            field_name: {
                "type": "string"
            }
        },
        "required": [field_name]
    })
}

fn resolve_generated_tool(
    tools: &[PublishedAgentTool],
    tool_name: &str,
) -> Option<ResolvedToolCall> {
    for tool in tools {
        if tool.tool_name == tool_name {
            return Some(ResolvedToolCall {
                tool: tool.clone(),
                kind: GeneratedToolKind::Base,
            });
        }

        let Some(streaming) = tool.operation.execution_config.streaming.as_ref() else {
            continue;
        };

        match streaming.mode {
            crank_core::ExecutionMode::Session => {
                if streaming.tool_family.start_tool_name.as_deref() == Some(tool_name) {
                    return Some(ResolvedToolCall {
                        tool: tool.clone(),
                        kind: GeneratedToolKind::SessionStart,
                    });
                }
                if streaming.tool_family.poll_tool_name.as_deref() == Some(tool_name) {
                    return Some(ResolvedToolCall {
                        tool: tool.clone(),
                        kind: GeneratedToolKind::SessionPoll,
                    });
                }
                if streaming.tool_family.stop_tool_name.as_deref() == Some(tool_name) {
                    return Some(ResolvedToolCall {
                        tool: tool.clone(),
                        kind: GeneratedToolKind::SessionStop,
                    });
                }
            }
            crank_core::ExecutionMode::AsyncJob => {
                if streaming.tool_family.start_tool_name.as_deref() == Some(tool_name) {
                    return Some(ResolvedToolCall {
                        tool: tool.clone(),
                        kind: GeneratedToolKind::AsyncJobStart,
                    });
                }
                if streaming.tool_family.status_tool_name.as_deref() == Some(tool_name) {
                    return Some(ResolvedToolCall {
                        tool: tool.clone(),
                        kind: GeneratedToolKind::AsyncJobStatus,
                    });
                }
                if streaming.tool_family.result_tool_name.as_deref() == Some(tool_name) {
                    return Some(ResolvedToolCall {
                        tool: tool.clone(),
                        kind: GeneratedToolKind::AsyncJobResult,
                    });
                }
                if streaming.tool_family.cancel_tool_name.as_deref() == Some(tool_name) {
                    return Some(ResolvedToolCall {
                        tool: tool.clone(),
                        kind: GeneratedToolKind::AsyncJobCancel,
                    });
                }
            }
            _ => {}
        }
    }

    None
}

fn runtime_operation(tool: &PublishedAgentTool) -> RuntimeOperation {
    let mut operation = RuntimeOperation::from(tool.operation.clone());
    operation.tool_name = tool.tool_name.clone();
    operation.tool_description.title = tool.tool_title.clone();
    operation.tool_description.description = tool.tool_description.clone();
    operation
}

fn schema_to_json_schema(schema: &crank_schema::Schema) -> Value {
    match schema.kind {
        crank_schema::SchemaKind::Object => {
            let mut properties = serde_json::Map::new();
            let mut required = Vec::new();

            for (field_name, field_schema) in &schema.fields {
                properties.insert(field_name.clone(), schema_to_json_schema(field_schema));

                if field_schema.required {
                    required.push(Value::String(field_name.clone()));
                }
            }

            json!({
                "type": "object",
                "properties": properties,
                "required": required
            })
        }
        crank_schema::SchemaKind::Array => json!({
            "type": "array",
            "items": schema
                .items
                .as_deref()
                .map(schema_to_json_schema)
                .unwrap_or_else(|| json!({}))
        }),
        crank_schema::SchemaKind::String => json!({ "type": "string" }),
        crank_schema::SchemaKind::Integer => json!({ "type": "integer" }),
        crank_schema::SchemaKind::Number => json!({ "type": "number" }),
        crank_schema::SchemaKind::Boolean => json!({ "type": "boolean" }),
        crank_schema::SchemaKind::Enum => json!({
            "type": "string",
            "enum": schema.enum_values
        }),
        crank_schema::SchemaKind::Null => json!({ "type": "null" }),
        crank_schema::SchemaKind::Oneof => json!({
            "anyOf": schema.variants.iter().map(schema_to_json_schema).collect::<Vec<_>>()
        }),
    }
}

impl AllowedOrigins {
    fn new(public_base_url: Option<String>) -> Self {
        Self {
            public_origin: public_base_url.and_then(|value| extract_origin(&value)),
        }
    }

    fn is_allowed(&self, origin: &str) -> bool {
        if origin.starts_with("http://localhost")
            || origin.starts_with("http://127.0.0.1")
            || origin.starts_with("https://localhost")
            || origin.starts_with("https://127.0.0.1")
        {
            return true;
        }

        match &self.public_origin {
            Some(public_origin) => public_origin == origin,
            None => false,
        }
    }
}

fn extract_origin(url: &str) -> Option<String> {
    let mut parts = url.split('/');
    let scheme = parts.next()?;
    let empty = parts.next()?;
    let authority = parts.next()?;

    if empty.is_empty() {
        return Some(format!("{scheme}//{authority}"));
    }

    None
}