package database

import (
	"database/sql"
	"time"

	"git.noroutes.net/NoRoutes/vibetunes/internal/idgen"
)

// GetCachedExternalMetadata returns a previously fetched MusicBrainz/
// Cover Art Archive response for (entityType, mbid, source), if any.
// found is false when nothing has been cached yet — callers decide
// whether/how to refresh, this layer never guesses an age-based expiry.
func GetCachedExternalMetadata(db *sql.DB, entityType, mbid, source string) (dataJSON string, fetchedAt time.Time, found bool, err error) {
	var fetchedAtStr string
	err = db.QueryRow(`SELECT data_json, fetched_at FROM external_metadata_cache WHERE entity_type = ? AND mbid = ? AND source = ?`,
		entityType, mbid, source).Scan(&dataJSON, &fetchedAtStr)
	if err == sql.ErrNoRows {
		return "", time.Time{}, false, nil
	}
	if err != nil {
		return "", time.Time{}, false, err
	}
	fetchedAt, _ = time.Parse("2006-01-02T15:04:05.000Z", fetchedAtStr)
	return dataJSON, fetchedAt, true, nil
}

// PutCachedExternalMetadata stores (or replaces) the cached response
// for (entityType, mbid, source).
func PutCachedExternalMetadata(db *sql.DB, entityType, mbid, source, dataJSON string) error {
	_, err := db.Exec(`
		INSERT INTO external_metadata_cache (id, entity_type, mbid, source, data_json, fetched_at)
		VALUES (?, ?, ?, ?, ?, strftime('%Y-%m-%dT%H:%M:%fZ','now'))
		ON CONFLICT(entity_type, mbid, source) DO UPDATE SET
			data_json = excluded.data_json,
			fetched_at = excluded.fetched_at`,
		idgen.New("emc"), entityType, mbid, source, dataJSON)
	return err
}