package postgres

import (
	"context"
	"errors"
	"fmt"

	"github.com/jackc/pgx/v5"

	"knowledge-governance/internal/workflows/artifactfetch"
)

// LoadArtifactFetchManifest resolves one pending intent plus its live source
// coordinates for the fetch script, keyed by the connection-stable node id.
func (s *Store) LoadArtifactFetchManifest(ctx context.Context, connectionID, nodeID string) (artifactfetch.Manifest, error) {
	return loadArtifactFetchManifest(ctx, s.db, connectionID, nodeID)
}

func loadArtifactFetchManifest(ctx context.Context, db interface {
	QueryRow(context.Context, string, ...any) pgx.Row
}, connectionID, nodeID string) (artifactfetch.Manifest, error) {
	var manifest artifactfetch.Manifest
	var fetchState string
	err := db.QueryRow(ctx, `SELECT connection.source_type,connection.name,intent.relative_path,intent.name,
	       intent.size_bytes,intent.modified_at,intent.locator_hash,intent.fetch_state
FROM catalog_import_intents intent
JOIN source_connections connection ON connection.id=intent.source_connection_id
WHERE intent.source_connection_id=$1 AND intent.node_id=$2`, connectionID, nodeID).
		Scan(&manifest.SourceType, &manifest.SourceName, &manifest.RelativePath, &manifest.Name,
			&manifest.SizeBytes, &manifest.ModifiedAt, &manifest.LocatorHash, &fetchState)
	if errors.Is(err, pgx.ErrNoRows) {
		return artifactfetch.Manifest{}, artifactfetch.ErrManifestGone
	}
	if err != nil {
		return artifactfetch.Manifest{}, fmt.Errorf("load artifact fetch manifest: %w", err)
	}
	if fetchState == "filtered" {
		return artifactfetch.Manifest{}, artifactfetch.ErrManifestFiltered
	}
	var filtered bool
	if err := db.QueryRow(ctx, `SELECT filename_is_filtered($1,$2,$3)`, connectionID, manifest.RelativePath, manifest.Name).Scan(&filtered); err != nil {
		return artifactfetch.Manifest{}, fmt.Errorf("evaluate artifact filename filter: %w", err)
	}
	if filtered {
		return artifactfetch.Manifest{}, artifactfetch.ErrManifestFiltered
	}
	manifest.ConnectionID = connectionID
	manifest.NodeID = nodeID
	return manifest, nil
}