const fs = require('fs');

function sortM3uByGroupTitle(filePath) {
    // Read the file
    const content = fs.readFileSync(filePath, 'utf8');
    const lines = content.split('\n');
    
    // First line should be #EXTM3U
    const header = lines[0];
    if (!header.startsWith('#EXTM3U')) {
        throw new Error('Invalid M3U file: Missing #EXTM3U header');
    }
    
    // Group the entries
    const entries = [];
    let currentEntry = [];
    
    for (let i = 1; i < lines.length; i++) {
        const line = lines[i].trim();
        if (!line) continue;
        
        if (line.startsWith('#EXTINF')) {
            if (currentEntry.length === 2) {
                entries.push(currentEntry);
            }
            currentEntry = [line];
        } else if (currentEntry.length === 1) {
            currentEntry.push(line);
        }
    }
    
    // Add the last entry if exists
    if (currentEntry.length === 2) {
        entries.push(currentEntry);
    }
    
    // Sort entries by group-title
    entries.sort((a, b) => {
        const groupTitleA = (a[0].match(/group-title="([^"]*)"/) || [])[1] || '';
        const groupTitleB = (b[0].match(/group-title="([^"]*)"/) || [])[1] || '';
        return groupTitleA.localeCompare(groupTitleB);
    });
    
    // Rebuild the file content
    const sortedContent = [
        header,
        ...entries.flatMap(entry => entry)
    ].join('\n');
    
    // Write back to file
    fs.writeFileSync(filePath, sortedContent);
    console.log('M3U file has been sorted by group-title');
}

// Get file path from command line argument
const filePath = process.argv[2];
if (!filePath) {
    console.error('Please provide a file path');
    process.exit(1);
}

try {
    sortM3uByGroupTitle(filePath);
} catch (error) {
    console.error('Error:', error.message);
    process.exit(1);
}