package sync

import (
	"context"
	"fmt"

	"github.com/jackc/pgx/v5"

	"git.fabledsword.com/bvandeusen/minstrel/internal/db/dbq"
)

// LogChange writes a row to library_changes inside the supplied transaction.
// Callers MUST pass the same tx that performed the underlying mutation —
// the change row and the mutation must commit or roll back together.
//
// entityID is the string form of the row's primary key. For composite-key
// entities (likes, playlist_tracks), use EncodeLikeID / EncodePlaylistTrackID
// to produce stable strings.
func LogChange(ctx context.Context, tx pgx.Tx, entityType EntityType, entityID string, op Op) error {
	q := dbq.New(tx)
	if err := q.InsertLibraryChange(ctx, dbq.InsertLibraryChangeParams{
		EntityType: string(entityType),
		EntityID:   entityID,
		Op:         string(op),
	}); err != nil {
		return fmt.Errorf("sync.LogChange(%s, %s, %s): %w", entityType, entityID, op, err)
	}
	return nil
}

// EncodeLikeID joins a user UUID and an entity UUID into the stable
// composite identifier used for like_* rows in library_changes. Both
// sides are UUID strings so no escaping is needed.
func EncodeLikeID(userID, entityID string) string {
	return userID + ":" + entityID
}

// EncodePlaylistTrackID joins a playlist UUID and a track UUID into the
// stable composite identifier used for playlist_track rows.
func EncodePlaylistTrackID(playlistID, trackID string) string {
	return playlistID + ":" + trackID
}