use serde::{Deserialize, Serialize};
use serde_json::Value;
use time::OffsetDateTime;

use crate::{AgentId, OperationId, WorkspaceId};

#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum InvocationSource {
    AdminTestRun,
    AgentToolCall,
}

#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum InvocationLevel {
    Debug,
    Info,
    Warn,
    Error,
}

#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum InvocationStatus {
    Ok,
    Error,
}

#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize)]
pub enum UsagePeriod {
    #[serde(rename = "30m")]
    Last30Minutes,
    #[serde(rename = "1h")]
    LastHour,
    #[serde(rename = "6h")]
    Last6Hours,
    #[serde(rename = "24h")]
    Last24Hours,
    #[serde(rename = "7d")]
    Last7Days,
    #[serde(rename = "30d")]
    Last30Days,
    #[serde(rename = "90d")]
    Last90Days,
    #[serde(rename = "this_month")]
    ThisMonth,
}

#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
pub struct InvocationLog {
    pub id: crate::ids::InvocationLogId,
    pub workspace_id: WorkspaceId,
    pub agent_id: Option<AgentId>,
    pub operation_id: OperationId,
    pub source: InvocationSource,
    pub level: InvocationLevel,
    pub status: InvocationStatus,
    pub tool_name: String,
    pub message: String,
    pub request_id: Option<String>,
    pub status_code: Option<u16>,
    pub duration_ms: u64,
    pub error_kind: Option<String>,
    pub request_preview: Value,
    pub response_preview: Value,
    #[serde(with = "time::serde::rfc3339")]
    pub created_at: OffsetDateTime,
}

#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
pub struct UsageRollup {
    pub workspace_id: WorkspaceId,
    pub agent_id: Option<AgentId>,
    pub operation_id: Option<OperationId>,
    pub period: UsagePeriod,
    pub calls_total: u64,
    pub calls_ok: u64,
    pub calls_error: u64,
    pub p50_ms: u64,
    pub p95_ms: u64,
    pub p99_ms: u64,
}

#[cfg(test)]
mod tests {
    use serde_json::json;
    use time::{OffsetDateTime, format_description::well_known::Rfc3339};

    use super::{InvocationLevel, InvocationLog, InvocationSource, InvocationStatus, UsagePeriod};
    use crate::{AgentId, OperationId, WorkspaceId, ids::InvocationLogId};

    fn timestamp(value: &str) -> OffsetDateTime {
        OffsetDateTime::parse(value, &Rfc3339).unwrap()
    }

    #[test]
    fn invocation_log_serializes_timestamps_as_rfc3339() {
        let log = InvocationLog {
            id: InvocationLogId::new("log_01"),
            workspace_id: WorkspaceId::new("ws_01"),
            agent_id: Some(AgentId::new("agent_01")),
            operation_id: OperationId::new("op_01"),
            source: InvocationSource::AdminTestRun,
            level: InvocationLevel::Info,
            status: InvocationStatus::Ok,
            tool_name: "create_lead".to_owned(),
            message: "ok".to_owned(),
            request_id: Some("req_01".to_owned()),
            status_code: Some(200),
            duration_ms: 123,
            error_kind: None,
            request_preview: json!({"input": "value"}),
            response_preview: json!({"ok": true}),
            created_at: timestamp("2026-04-19T12:34:56Z"),
        };

        let value = serde_json::to_value(&log).unwrap();

        assert_eq!(value["created_at"], "2026-04-19T12:34:56Z");
        assert_eq!(value["source"], "admin_test_run");
        assert_eq!(value["level"], "info");
        assert_eq!(value["status"], "ok");
    }

    #[test]
    fn usage_period_serializes_compact_labels() {
        let value = serde_json::to_value(UsagePeriod::Last7Days).unwrap();

        assert_eq!(value, "7d");
    }
}