const Soundcloud = require('soundcloud.ts').default;
const fs = require('fs');
const path = require('path');
const slugify = require('slugify');

// Configuration
const PLAYLIST_URL = 'https://soundcloud.com/snxraven/sets/raven-scott-rap'; // Metal playlist URL
const CACHE_FILE = path.join(__dirname, 'cache_rap.json'); // Cache file for metal playlist

// Helper function to create a slug from track title
function generateSlug(title) {
    try {
        const slug = slugify(title, {
            lower: true,
            strict: true,
            remove: /[*+~.()'"!:@]/g
        });
        if (!slug || slug.trim() === '') {
            console.warn(`Empty slug for title: "${title}". Using fallback.`);
            return 'track-' + Date.now();
        }
        console.log(`Generated slug for "${title}": "${slug}"`);
        return slug;
    } catch (err) {
        console.error(`Error generating slug for title: "${title}"`, err);
        return 'track-' + Date.now();
    }
}

// Helper function to sanitize track data
function sanitizeTrackData(track) {
    return {
        title: typeof track.title === 'string' ? track.title : 'Unknown Title',
        description: typeof track.description === 'string' ? track.description : 'No description available',
        url: typeof track.permalink_url === 'string' ? track.permalink_url : '',
        playCount: Number.isFinite(track.playback_count) ? track.playback_count : 0,
        publishedAt: typeof track.created_at === 'string' ? track.created_at : new Date().toISOString(),
        slug: generateSlug(track.title || 'Unknown')
    };
}

// Helper function to save cache
function saveCache(cacheFile, data) {
    try {
        // Filter out invalid tracks
        const validTracks = data.tracks.filter(track => {
            try {
                JSON.stringify(track);
                return true;
            } catch (err) {
                console.error(`Invalid track data for "${track.title}":`, err);
                return false;
            }
        });
        const cacheData = { tracks: validTracks, timestamp: data.timestamp };
        console.log(`Saving cache with ${validTracks.length} tracks to ${cacheFile}`);
        console.log('Cached track titles:', validTracks.map(t => t.title));
        const jsonString = JSON.stringify(cacheData, null, 2);
        fs.writeFileSync(cacheFile, jsonString, { encoding: 'utf8' });
        console.log(`Cache saved to ${cacheFile}`);
    } catch (err) {
        console.error(`Error saving cache to ${cacheFile}:`, err);
        console.error('Problematic cache data:', data);
    }
}

// Fetch all tracks from a SoundCloud playlist
async function fetchPlaylist(playlistUrl) {
    try {
        const soundcloud = new Soundcloud(); // No client ID or OAuth token
        const playlist = await soundcloud.playlists.getAlt(playlistUrl);
        console.log(`Fetched playlist with ${playlist.tracks.length} tracks:`, playlist.tracks.map(t => t.title));

        const tracks = [];
        for (const track of playlist.tracks) {
            try {
                console.log(`Processing track: "${track.title || 'Unknown'}"`);
                const trackData = sanitizeTrackData(track);
                tracks.push(trackData);
                console.log(`Successfully processed track: "${track.title || 'Unknown'}"`);
            } catch (err) {
                console.error(`Error processing track "${track.title || 'Unknown'}":`, err);
                continue;
            }
        }

        console.log(`Total fetched tracks: ${tracks.length}`);
        if (tracks.length < 56) {
            console.warn(`Expected ~56 tracks, but only ${tracks.length} were fetched. Verify playlist URL or check for private tracks.`);
        }
        return tracks;
    } catch (err) {
        console.error(`Error fetching playlist ${playlistUrl}:`, err);
        return [];
    }
}

// Main function to generate cache
async function generateCache() {
    const tracks = await fetchPlaylist(PLAYLIST_URL);
    saveCache(CACHE_FILE, { tracks, timestamp: Date.now() });
}

// Run the cache generation
generateCache().catch(err => {
    console.error('Error generating cache:', err);
    process.exit(1);
});