import fs from 'fs';
import path from 'path';
import { fileURLToPath } from 'url';

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

// Function to extract seat number from filename
export const extractSeatNumber = (filename) => {
  // Try to find a number in the filename
  const matches = filename.match(/\d+/);
  return matches ? parseInt(matches[0], 10) : null;
};

// Function to find the correct PDF for a seat number
export const findPdfForSeat = async (matchId, seatNumber) => {
  try {
    // Get the match's PDF files from the database
    const [match] = await query('SELECT pdfFiles FROM matches WHERE id = ?', [matchId]);
    if (!match || !match.pdfFiles) return null;

    const pdfFiles = JSON.parse(match.pdfFiles);
    
    // First try to find a PDF with the seat number in the filename
    for (const pdfFile of pdfFiles) {
      const filename = path.basename(pdfFile);
      const pdfSeatNumber = extractSeatNumber(filename);
      if (pdfSeatNumber === seatNumber) {
        return path.join(__dirname, '..', 'uploads', pdfFile);
      }
    }

    // If no match found, return the first PDF (admin will need to manually match)
    if (pdfFiles.length > 0) {
      return path.join(__dirname, '..', 'uploads', pdfFiles[0]);
    }

    return null;
  } catch (error) {
    console.error('Error finding PDF for seat:', error);
    return null;
  }
};

// Function to store uploaded PDFs
export const storePdf = async (file, matchId) => {
  try {
    const uploadDir = path.join(__dirname, '..', 'uploads', matchId);
    
    // Create directory if it doesn't exist
    if (!fs.existsSync(uploadDir)) {
      fs.mkdirSync(uploadDir, { recursive: true });
    }

    const filename = `${Date.now()}-${file.originalname}`;
    const filepath = path.join(uploadDir, filename);
    
    // Move the file to the upload directory
    await fs.promises.writeFile(filepath, file.buffer);
    
    return path.join(matchId, filename);
  } catch (error) {
    console.error('Error storing PDF:', error);
    throw error;
  }
};