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import { txasupabase } from '../../../lib/txasupabase.js';

// Decryption Helper for Browser Token
function decryptToken(token, key) {
  if (!token || !token.startsWith('tk_')) return null;
  try {
    const rawToken = token.substring(3);
    let str = rawToken.replace(/-/g, '+').replace(/_/g, '/');
    while (str.length % 4) str += '=';
    
    // Decode base64 to binary string
    const text = Buffer.from(str, 'base64').toString('binary');
    
    let utf8Text = '';
    for (let i = 0; i < text.length; i++) {
      const charCode = text.charCodeAt(i);
      const keyChar = key.charCodeAt(i % key.length);
      const decryptedChar = charCode ^ keyChar;
      utf8Text += String.fromCharCode(decryptedChar);
    }
    
    return decodeURIComponent(escape(utf8Text));
  } catch (e) {
    console.error('[Telemetry] Decryption failed:', e);
    return null;
  }
}

// User-Agent Parser for Device & Browser
function parseUserAgent(ua) {
  let device = 'Thiết bị khác';
  let browser = 'Trình duyệt khác';
  
  if (!ua) return { device, browser };

  // OS / Device detection
  if (ua.includes('Windows NT 10.0')) {
    device = 'Windows 10/11';
  } else if (ua.includes('Windows NT 6.1')) {
    device = 'Windows 7';
  } else if (ua.includes('Windows NT 6.2') || ua.includes('Windows NT 6.3')) {
    device = 'Windows 8/8.1';
  } else if (ua.includes('Android')) {
    const androidMatch = ua.match(/Android\s+([^;)]+)/);
    const modelMatch = ua.match(/Android\s+[^;]+;\s+([^;)]+)/);
    const deviceName = modelMatch ? modelMatch[1].trim() : (androidMatch ? androidMatch[0] : 'Android Device');
    device = `Android (${deviceName})`;
  } else if (ua.includes('iPhone')) {
    const iphoneMatch = ua.match(/iPhone;\s+CPU\s+iPhone\s+OS\s+([^;)]+)/);
    const osVer = iphoneMatch ? iphoneMatch[1].replace(/_/g, '.') : '';
    device = osVer ? `iPhone (iOS ${osVer})` : 'iPhone';
  } else if (ua.includes('iPad')) {
    device = 'iPad';
  } else if (ua.includes('Macintosh') || ua.includes('Mac OS X')) {
    device = 'macOS';
  } else if (ua.includes('Linux')) {
    device = 'Linux';
  }

  // Browser detection
  if (ua.includes('Edg/')) {
    browser = 'Microsoft Edge';
  } else if (ua.includes('Chrome/') && !ua.includes('Chromium')) {
    browser = 'Google Chrome';
  } else if (ua.includes('Safari/') && !ua.includes('Chrome')) {
    browser = 'Safari';
  } else if (ua.includes('Firefox/')) {
    browser = 'Mozilla Firefox';
  } else if (ua.includes('OPR/') || ua.includes('Opera/')) {
    browser = 'Opera';
  } else if (ua.includes('Zalo/')) {
    browser = 'Zalo Browser';
  }
  
  return { device, browser };
}

export const POST = async ({ request }) => {
  try {
    const body = await request.json();
    const { movie_slug, movie_name, episode_name, error_type, error_message, error_details, browser_token } = body;

    if (!error_type) {
      return new Response(JSON.stringify({ error: 'Error type is required!' }), {
        status: 400,
        headers: { 'Content-Type': 'application/json' }
      });
    }

    const userAgent = request.headers.get('user-agent') || '';
    const fallbackIp = request.headers.get('cf-connecting-ip') || 
                       request.headers.get('x-real-ip') || 
                       request.headers.get('x-forwarded-for')?.split(',')[0].trim() || 
                       '127.0.0.1';

    // Decrypt and parse browser, IP, location & device details
    let decryptedInfo = null;
    let parsedDevice = 'Không rõ';
    let parsedBrowser = 'Không rõ';
    let parsedIp = fallbackIp;
    let parsedLocation = null;

    if (browser_token) {
      if (browser_token.startsWith('tk_')) {
        decryptedInfo = decryptToken(browser_token, 'phimtxadinhvaikk');
        if (decryptedInfo) {
          const parts = decryptedInfo.split(' - ');
          const ua = parts[0] || '';
          
          // Get IP from token
          const ipPart = parts.find(p => p.startsWith('IP: '));
          if (ipPart) {
            parsedIp = ipPart.replace('IP: ', '');
          }
          
          // Get Location from token
          const locParts = parts.filter(p => !p.startsWith('IP: ') && p !== ua);
          if (locParts.length > 0) {
            parsedLocation = locParts.join(', ');
          }
          
          // Parse UA from token
          const parsed = parseUserAgent(ua);
          parsedDevice = parsed.device;
          parsedBrowser = parsed.browser;
        } else {
          // Decryption failed but we still have request UA
          const parsed = parseUserAgent(userAgent);
          parsedDevice = parsed.device;
          parsedBrowser = parsed.browser;
        }
      } else if (browser_token.startsWith('txanot-')) {
        // Fallback token format: txanot-[ip]-[uaHash]
        const parts = browser_token.split('-');
        if (parts[1]) {
          parsedIp = parts[1];
        }
        const parsed = parseUserAgent(userAgent);
        parsedDevice = parsed.device;
        parsedBrowser = parsed.browser;
      }
    } else {
      // No token provided, fallback to request headers
      const parsed = parseUserAgent(userAgent);
      parsedDevice = parsed.device;
      parsedBrowser = parsed.browser;
    }

    const enrichedDetails = {
      ...(error_details || {}),
      parsed_device: parsedDevice,
      parsed_browser: parsedBrowser,
      parsed_ip: parsedIp,
      parsed_location: parsedLocation,
      decrypted_raw: decryptedInfo
    };

    // Insert into txa_player_errors
    const { data, error } = await txasupabase.client
      .from('txa_player_errors')
      .insert({
        movie_slug: movie_slug || null,
        movie_name: movie_name || null,
        episode_name: episode_name || null,
        error_type,
        error_message: error_message || null,
        error_details: enrichedDetails,
        user_agent: userAgent,
        ip: parsedIp,
        browser_token: browser_token || null
      })
      .select()
      .single();

    if (error) {
      console.error('Error inserting player error into Supabase:', error);
      return new Response(JSON.stringify({ error: error.message }), {
        status: 500,
        headers: { 'Content-Type': 'application/json' }
      });
    }

    // Write a unified system log featuring decrypted info
    const locationStr = parsedLocation ? ` (${parsedLocation})` : '';
    const logMessage = `Lỗi Player (${error_type}) trên phim "${movie_name || 'Không rõ'}" (${episode_name || 'Không rõ'}): ${error_message || ''}. Thiết bị: ${parsedDevice} | Trình duyệt: ${parsedBrowser} | IP: ${parsedIp}${locationStr}`;

    try {
      if (typeof txasupabase.createLog === 'function') {
        await txasupabase.createLog(
          'player_error',
          'error',
          logMessage,
          { movie_slug, movie_name, episode_name, error_type, error_message, ip: parsedIp, browser_token, parsed_device: parsedDevice, parsed_browser: parsedBrowser }
        );
      } else {
        await txasupabase.client.from('logs').insert({
          action: 'player_error',
          level: 'error',
          message: logMessage,
          details: JSON.stringify({ movie_slug, movie_name, episode_name, error_type, error_message, ip: parsedIp, browser_token, parsed_device: parsedDevice, parsed_browser: parsedBrowser })
        });
      }
    } catch (logErr) {
      console.error('Failed to write to logs table:', logErr);
    }

    return new Response(JSON.stringify({
      success: true,
      message: 'Player error reported successfully.',
      data
    }), {
      status: 200,
      headers: { 'Content-Type': 'application/json' }
    });
  } catch (err) {
    console.error('Error in report-error API:', err);
    return new Response(JSON.stringify({ error: 'Internal system error!' }), {
      status: 500,
      headers: { 'Content-Type': 'application/json' }
    });
  }
};