use std::collections::BTreeSet;

use crank_core::WorkspaceId;
use crank_registry::{ArtifactSourceId, DetachArtifactSourceRequest, ImportJobSourceEnvelope};
use time::OffsetDateTime;

use crate::{error::ApiError, service::OpenApiUploadLocale};

use super::canonical_external_document_uri;

const MAX_IMPORT_JOB_DOCUMENTS: usize = 32;

pub(super) fn import_job_source(
    payload: &serde_json::Value,
    locale: OpenApiUploadLocale,
) -> Result<ImportJobSourceEnvelope, ApiError> {
    let source = payload
        .get("source")
        .ok_or_else(|| ApiError::openapi_upload(locale, "source_unavailable"))?;
    let source_id = source
        .get("source_id")
        .and_then(serde_json::Value::as_str)
        .filter(|value| value.len() <= 132)
        .ok_or_else(|| ApiError::openapi_upload(locale, "source_unavailable"))?;
    let digest = source
        .get("digest")
        .and_then(serde_json::Value::as_str)
        .and_then(|value| value.parse().ok())
        .ok_or_else(|| ApiError::openapi_upload(locale, "source_integrity"))?;
    Ok(ImportJobSourceEnvelope {
        source_id: ArtifactSourceId::new(source_id),
        digest,
    })
}

pub(super) fn import_job_dependencies(
    payload: &serde_json::Value,
    locale: OpenApiUploadLocale,
) -> Result<Vec<(String, ImportJobSourceEnvelope)>, ApiError> {
    let empty = Vec::new();
    let items = payload
        .get("dependency_snapshots")
        .and_then(serde_json::Value::as_array)
        .unwrap_or(&empty);
    if items.len() > MAX_IMPORT_JOB_DOCUMENTS {
        return Err(ApiError::openapi_upload(locale, "source_integrity"));
    }
    let mut canonical_uris = BTreeSet::new();
    items
        .iter()
        .map(|item| {
            let canonical_uri = item
                .get("canonical_uri")
                .and_then(serde_json::Value::as_str)
                .filter(|value| {
                    canonical_external_document_uri(None, value).as_deref() == Some(*value)
                })
                .ok_or_else(|| ApiError::openapi_upload(locale, "source_integrity"))?;
            if !canonical_uris.insert(canonical_uri.to_owned()) {
                return Err(ApiError::openapi_upload(locale, "source_integrity"));
            }
            let source_id = item
                .get("source_id")
                .and_then(serde_json::Value::as_str)
                .filter(|value| value.len() <= 132)
                .ok_or_else(|| ApiError::openapi_upload(locale, "source_integrity"))?;
            let digest = item
                .get("digest")
                .and_then(serde_json::Value::as_str)
                .and_then(|value| value.parse().ok())
                .ok_or_else(|| ApiError::openapi_upload(locale, "source_integrity"))?;
            Ok((
                canonical_uri.to_owned(),
                ImportJobSourceEnvelope {
                    source_id: ArtifactSourceId::new(source_id),
                    digest,
                },
            ))
        })
        .collect()
}

pub(super) fn import_job_normalization_config(
    payload: &serde_json::Value,
    current: &crank_import::rest::NormalizationConfig,
    legacy_v1: bool,
    locale: OpenApiUploadLocale,
) -> Result<crank_import::rest::NormalizationConfig, ApiError> {
    if legacy_v1 {
        return Ok(current.clone());
    }
    payload
        .pointer("/normalization/config")
        .cloned()
        .ok_or_else(|| ApiError::openapi_upload(locale, "source_integrity"))
        .and_then(|value| {
            serde_json::from_value(value)
                .map_err(|_| ApiError::openapi_upload(locale, "source_integrity"))
        })
}

pub(super) struct SourceDetachGuard {
    registry: crank_registry::PostgresRegistry,
    workspace_id: WorkspaceId,
    source_id: ArtifactSourceId,
    expected_updated_at: OffsetDateTime,
    armed: bool,
}

impl SourceDetachGuard {
    pub(super) fn new(
        registry: crank_registry::PostgresRegistry,
        workspace_id: WorkspaceId,
        source_id: ArtifactSourceId,
        expected_updated_at: OffsetDateTime,
    ) -> Self {
        Self {
            registry,
            workspace_id,
            source_id,
            expected_updated_at,
            armed: true,
        }
    }

    pub(super) fn disarm(&mut self) {
        self.armed = false;
    }

    pub(super) async fn detach_now(&mut self) {
        if !self.armed {
            return;
        }
        self.armed = false;
        let _ = self
            .registry
            .detach_artifact_source(DetachArtifactSourceRequest {
                workspace_id: &self.workspace_id,
                source_id: &self.source_id,
                expected_updated_at: Some(self.expected_updated_at),
                detached_at: OffsetDateTime::now_utc(),
            })
            .await;
    }
}

impl Drop for SourceDetachGuard {
    fn drop(&mut self) {
        if !self.armed {
            return;
        }
        let registry = self.registry.clone();
        let workspace_id = self.workspace_id.clone();
        let source_id = self.source_id.clone();
        let expected_updated_at = Some(self.expected_updated_at);
        if let Ok(handle) = tokio::runtime::Handle::try_current() {
            handle.spawn(async move {
                let _ = registry
                    .detach_artifact_source(DetachArtifactSourceRequest {
                        workspace_id: &workspace_id,
                        source_id: &source_id,
                        expected_updated_at,
                        detached_at: OffsetDateTime::now_utc(),
                    })
                    .await;
            });
        }
    }
}