/**
 * Controller pour le tirage au sort du gros lot
 */
import { pool } from '../../db.js';
import { AppError, asyncHandler } from '../middleware/errorHandler.js';
import { sendDrawWinnerEmail } from '../services/email.service.js';

/**
 * Récupérer la liste des participants éligibles
 * GET /api/draw/eligible-participants
 */
export const getEligibleParticipants = asyncHandler(async (req, res) => {
  const { minTickets = 0, verified = true } = req.query;

  // Requête pour obtenir les utilisateurs éligibles
  // Pour le tirage au sort du gros lot, tous les participants ont une chance égale
  // Note: Les utilisateurs inactifs (compte supprimé) sont inclus s'ils ont des tickets validés
  const query = `
    SELECT
      u.id,
      u.email,
      u.first_name,
      u.last_name,
      u.is_verified,
      u.is_active,
      u.created_at,
      COALESCE(COUNT(DISTINCT t.id), 0) as tickets_played,
      COALESCE(COUNT(DISTINCT CASE WHEN t.status = 'CLAIMED' THEN t.id END), 0) as prizes_won
    FROM users u
    LEFT JOIN tickets t ON u.id = t.user_id AND t.played_at IS NOT NULL
    WHERE u.role = 'CLIENT'
      ${verified === 'true' ? 'AND u.is_verified = TRUE' : ''}
    GROUP BY u.id, u.email, u.first_name, u.last_name, u.is_verified, u.is_active, u.created_at
    ${parseInt(minTickets) > 0 ? 'HAVING COUNT(DISTINCT t.id) >= $1' : ''}
    ORDER BY u.created_at ASC
  `;

  const params = parseInt(minTickets) > 0 ? [parseInt(minTickets)] : [];
  const result = await pool.query(query, params);

  res.json({
    success: true,
    data: {
      participants: result.rows,
      total: result.rows.length,
      criteria: {
        minTickets: parseInt(minTickets),
        verified: verified === 'true',
      },
    },
  });
});

/**
 * Vérifier si un tirage a déjà été effectué
 * GET /api/draw/check-existing
 */
export const checkExistingDraw = asyncHandler(async (req, res) => {
  const result = await pool.query(`
    SELECT
      d.*,
      u.email as winner_email_current,
      u.first_name || ' ' || u.last_name as winner_name_current
    FROM grand_prize_draws d
    LEFT JOIN users u ON d.winner_id = u.id
    ORDER BY d.draw_date DESC
    LIMIT 1
  `);

  res.json({
    success: true,
    data: {
      hasExistingDraw: result.rows.length > 0,
      lastDraw: result.rows[0] || null,
    },
  });
});

/**
 * Lancer le tirage au sort
 * POST /api/draw/conduct
 */
export const conductDraw = asyncHandler(async (req, res) => {
  const { criteria, prizeName, prizeValue } = req.body;
  const adminId = req.user.id;

  // Vérifier que le lot "An de thé" existe
  const grandPrizeExists = await pool.query(
    "SELECT id FROM prizes WHERE type = 'GRAND_PRIZE' LIMIT 1"
  );

  if (grandPrizeExists.rows.length === 0) {
    throw new AppError('Le lot grand prize n\'existe pas dans la base de données', 400);
  }

  // Note: Le stock n'est plus vérifié pour permettre plusieurs tirages de test
  // L'administrateur peut annuler un tirage et en relancer un nouveau si nécessaire

  // Récupérer les participants éligibles
  const minTickets = criteria?.minTickets || 0;
  const verified = criteria?.verified !== false;

  const participantsQuery = `
    SELECT
      u.id,
      u.email,
      u.first_name,
      u.last_name,
      COALESCE(COUNT(DISTINCT t.id), 0) as tickets_played
    FROM users u
    LEFT JOIN tickets t ON u.id = t.user_id AND t.played_at IS NOT NULL
    WHERE u.role = 'CLIENT'
      ${verified ? 'AND u.is_verified = TRUE' : ''}
    GROUP BY u.id, u.email, u.first_name, u.last_name
    ${parseInt(minTickets) > 0 ? 'HAVING COUNT(DISTINCT t.id) >= $1' : ''}
  `;

  const params = parseInt(minTickets) > 0 ? [minTickets] : [];
  const participantsResult = await pool.query(participantsQuery, params);
  const eligibleParticipants = participantsResult.rows;

  if (eligibleParticipants.length === 0) {
    throw new AppError('Aucun participant éligible trouvé avec ces critères', 400);
  }

  // Sélection aléatoire du gagnant
  const randomIndex = Math.floor(Math.random() * eligibleParticipants.length);
  const winner = eligibleParticipants[randomIndex];

  // Compter le total de tous les participants (pour statistiques)
  const totalParticipantsResult = await pool.query(
    "SELECT COUNT(DISTINCT id) as total FROM users WHERE role = 'CLIENT'"
  );
  const totalParticipants = parseInt(totalParticipantsResult.rows[0].total);

  // Enregistrer le tirage dans la base de données dans une transaction
  const client = await pool.connect();

  try {
    await client.query('BEGIN');

    // Enregistrer le tirage
    const drawResult = await client.query(
      `INSERT INTO grand_prize_draws (
        conducted_by,
        winner_id,
        winner_email,
        winner_name,
        prize_name,
        prize_value,
        total_participants,
        eligible_participants,
        criteria,
        status
      ) VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, 'COMPLETED')
      RETURNING *`,
      [
        adminId,
        winner.id,
        winner.email,
        `${winner.first_name} ${winner.last_name}`,
        prizeName || 'Gros lot final',
        prizeValue || '',
        totalParticipants,
        eligibleParticipants.length,
        JSON.stringify(criteria),
      ]
    );

    // Note: Le stock n'est plus décrémenté pour permettre plusieurs tirages de test
    // En production, l'administrateur devra valider le tirage final définitif

    await client.query('COMMIT');

    const draw = drawResult.rows[0];
    client.release();

    console.log('🎉 Tirage au sort effectué!');
    console.log(`   Gagnant: ${winner.email}`);
    console.log(`   Participants éligibles: ${eligibleParticipants.length}`);
    console.log(`   Total participants: ${totalParticipants}`);

    // Envoyer l'email de notification au gagnant
    try {
      await sendDrawWinnerEmail(winner.email, winner.first_name, prizeName || 'Un an de thé d\'une valeur de 360€');
      console.log(`   📧 Email de notification envoyé à ${winner.email}`);
    } catch (error) {
      console.error('Erreur envoi email au gagnant:', error);
    }

    res.json({
      success: true,
      message: 'Tirage au sort effectué avec succès!',
      data: {
        draw: {
          id: draw.id,
          drawDate: draw.draw_date,
          status: draw.status,
        },
        winner: {
          id: winner.id,
          email: winner.email,
          name: `${winner.first_name} ${winner.last_name}`,
          ticketsPlayed: winner.tickets_played,
        },
        statistics: {
          totalParticipants,
          eligibleParticipants: eligibleParticipants.length,
          criteria,
        },
        prize: {
          name: prizeName || 'Gros lot final',
          value: prizeValue || '',
        },
      },
    });
  } catch (error) {
    await client.query('ROLLBACK');
    client.release();
    throw error;
  }
});

/**
 * Récupérer l'historique des tirages
 * GET /api/draw/history
 */
export const getDrawHistory = asyncHandler(async (req, res) => {
  const result = await pool.query(`
    SELECT
      d.*,
      u_admin.email as admin_email,
      u_admin.first_name || ' ' || u_admin.last_name as admin_name
    FROM grand_prize_draws d
    LEFT JOIN users u_admin ON d.conducted_by = u_admin.id
    ORDER BY d.draw_date DESC
  `);

  res.json({
    success: true,
    data: {
      draws: result.rows,
      total: result.rows.length,
    },
  });
});

/**
 * Marquer le gagnant comme notifié
 * PUT /api/draw/:id/notify
 */
export const markAsNotified = asyncHandler(async (req, res) => {
  const { id } = req.params;

  const result = await pool.query(
    `UPDATE grand_prize_draws
     SET status = 'NOTIFIED', notified_at = CURRENT_TIMESTAMP
     WHERE id = $1
     RETURNING *`,
    [id]
  );

  if (result.rows.length === 0) {
    throw new AppError('Tirage non trouvé', 404);
  }

  res.json({
    success: true,
    message: 'Gagnant marqué comme notifié',
    data: result.rows[0],
  });
});

/**
 * Marquer le lot comme récupéré
 * PUT /api/draw/:id/claim
 */
export const markAsClaimed = asyncHandler(async (req, res) => {
  const { id } = req.params;
  const { notes } = req.body;

  const result = await pool.query(
    `UPDATE grand_prize_draws
     SET status = 'CLAIMED', claimed_at = CURRENT_TIMESTAMP, notes = $2
     WHERE id = $1
     RETURNING *`,
    [id, notes || null]
  );

  if (result.rows.length === 0) {
    throw new AppError('Tirage non trouvé', 404);
  }

  res.json({
    success: true,
    message: 'Lot marqué comme récupéré',
    data: result.rows[0],
  });
});

/**
 * Générer un rapport du tirage au sort
 * GET /api/draw/:id/report
 */
export const generateReport = asyncHandler(async (req, res) => {
  const { id } = req.params;

  const drawResult = await pool.query(
    `SELECT
      d.*,
      u_admin.email as admin_email,
      u_admin.first_name || ' ' || u_admin.last_name as admin_name,
      u_winner.email as winner_email_current,
      u_winner.first_name as winner_first_name,
      u_winner.last_name as winner_last_name,
      u_winner.phone,
      u_winner.city
    FROM grand_prize_draws d
    LEFT JOIN users u_admin ON d.conducted_by = u_admin.id
    LEFT JOIN users u_winner ON d.winner_id = u_winner.id
    WHERE d.id = $1`,
    [id]
  );

  if (drawResult.rows.length === 0) {
    throw new AppError('Tirage non trouvé', 404);
  }

  const draw = drawResult.rows[0];

  // Récupérer les tickets du gagnant
  const ticketsResult = await pool.query(
    `SELECT
      t.code,
      t.played_at,
      t.status,
      p.name as prize_name
    FROM tickets t
    LEFT JOIN prizes p ON t.prize_id = p.id
    WHERE t.user_id = $1 AND t.played_at IS NOT NULL
    ORDER BY t.played_at DESC`,
    [draw.winner_id]
  );

  const report = {
    draw: {
      id: draw.id,
      date: draw.draw_date,
      conductedBy: {
        name: draw.admin_name,
        email: draw.admin_email,
      },
      status: draw.status,
      notifiedAt: draw.notified_at,
      claimedAt: draw.claimed_at,
      notes: draw.notes,
    },
    prize: {
      name: draw.prize_name,
      value: draw.prize_value,
    },
    winner: {
      id: draw.winner_id,
      email: draw.winner_email_current,
      firstName: draw.winner_first_name,
      lastName: draw.winner_last_name,
      phone: draw.phone,
      city: draw.city,
      tickets: ticketsResult.rows,
      totalTickets: ticketsResult.rows.length,
    },
    statistics: {
      totalParticipants: draw.total_participants,
      eligibleParticipants: draw.eligible_participants,
      criteria: draw.criteria,
    },
  };

  res.json({
    success: true,
    data: report,
  });
});

/**
 * Annuler/Supprimer un tirage au sort
 * DELETE /api/draw/:id
 */
export const deleteDraw = asyncHandler(async (req, res) => {
  const { id } = req.params;
  const adminId = req.user.id;

  // Vérifier que le tirage existe
  const drawCheck = await pool.query(
    'SELECT * FROM grand_prize_draws WHERE id = $1',
    [id]
  );

  if (drawCheck.rows.length === 0) {
    throw new AppError('Tirage non trouvé', 404);
  }

  const draw = drawCheck.rows[0];

  // Supprimer le tirage
  await pool.query('DELETE FROM grand_prize_draws WHERE id = $1', [id]);

  console.log('🗑️  Tirage au sort annulé!');
  console.log(`   ID du tirage: ${id}`);
  console.log(`   Gagnant: ${draw.winner_email}`);
  console.log(`   Annulé par: Admin ID ${adminId}`);

  res.json({
    success: true,
    message: 'Tirage au sort annulé avec succès',
    data: {
      deletedDrawId: id,
      deletedDraw: {
        winner: draw.winner_name,
        email: draw.winner_email,
        prize: draw.prize_name,
        date: draw.draw_date,
      },
    },
  });
});

export default {
  getEligibleParticipants,
  checkExistingDraw,
  conductDraw,
  getDrawHistory,
  markAsNotified,
  markAsClaimed,
  generateReport,
  deleteDraw,
};