<?php

require_once __DIR__ . '/MediaType.php';

class Music extends MediaType {
    protected function getType() {
        return 'Album';
    }
    
    protected function getTypeSpecificFields() {
        return ['artist', 'album_type', 'release_date'];
    }
    
    protected function validateTypeSpecificFields($data) {
        // Music spezifische Validierung
    }
    
    public function search($filters = [], $page = 1, $limit = 20) {
        // Nur Music suchen
        $filters['type'] = 'Album';
        return parent::search($filters, $page, $limit);
    }
    
    public function getWithTracks($id) {
        $media = $this->getWithRelations($id);
        if (!$media) {
            return null;
        }
        
        $media['tracks'] = $this->getTracks($id);
        
        return $media;
    }
    
    public function getTracks($mediaId) {
        $stmt = $this->pdo->prepare("
            SELECT * FROM tracks WHERE media_id = ? ORDER BY track_number
        ");
        $stmt->execute([$mediaId]);
        return $stmt->fetchAll();
    }
    
    public function addTrack($mediaId, $trackData) {
        $stmt = $this->pdo->prepare("
            INSERT INTO tracks (media_id, track_number, title, artist)
            VALUES (?, ?, ?, ?)
        ");
        $stmt->execute([
            $mediaId,
            $trackData['track_number'] ?? null,
            $trackData['title'] ?? null,
            //$trackData['duration'] ?? null,
            $trackData['artist'] ?? null
        ]);
        return $this->pdo->lastInsertId();
    }
    
    public function updateTrack($trackId, $trackData) {
        $fields = [];
        $params = [];
        
        foreach (['track_number', 'title', 'artist'] as $field) {
            if (array_key_exists($field, $trackData)) {
                $fields[] = "$field = ?";
                $params[] = $trackData[$field];
            }
        }
        
        if (!empty($fields)) {
            $params[] = $trackId;
            $stmt = $this->pdo->prepare("UPDATE tracks SET " . implode(', ', $fields) . " WHERE id = ?");
            $stmt->execute($params);
            return true;
        }
        return false;
    }
    
    public function deleteTrack($trackId) {
        $stmt = $this->pdo->prepare("DELETE FROM tracks WHERE id = ?");
        $stmt->execute([$trackId]);
        return $stmt->rowCount() > 0;
    }
    
    public function createWithRelations($data) {
        $mediaId = parent::createWithRelations($data);
        
        // Tracks speichern
        if (isset($data['tracks']) && is_array($data['tracks'])) {
            foreach ($data['tracks'] as $track) {
                $this->addTrack($mediaId, $track);
            }
        }
        
        return $mediaId;
    }
    
    public function updateWithRelations($id, $data) {
        parent::updateWithRelations($id, $data);
        
        // Tracks aktualisieren
        if (isset($data['tracks']) && is_array($data['tracks'])) {
            // Alle existierenden Tracks löschen
            $this->pdo->prepare("DELETE FROM tracks WHERE media_id = ?")->execute([$id]);
            // Neue Tracks hinzufügen
            foreach ($data['tracks'] as $track) {
                $this->addTrack($id, $track);
            }
        }
        
        return true;
    }
}