// Configuration et initialisation de la base de données PostgreSQL
const { Pool } = require('pg');
const bcrypt = require('bcrypt');
const logger = require('./logger');

// Configuration PostgreSQL depuis DATABASE_URL ou variables d'environnement
const DATABASE_URL = process.env.DATABASE_URL ||
  `postgresql://${process.env.PGUSER || 'noteflow'}:${process.env.PGPASSWORD || 'noteflow_secure_password_change_me'}@${process.env.PGHOST || 'localhost'}:${process.env.PGPORT || '5499'}/${process.env.PGDATABASE || 'noteflow'}`;

// Créer le pool de connexions PostgreSQL
const pool = new Pool({
  connectionString: DATABASE_URL,
  max: 20, // Maximum de connexions dans le pool
  idleTimeoutMillis: 30000,
  connectionTimeoutMillis: 2000,
});

// Gestion des erreurs du pool
pool.on('error', (err) => {
  logger.error('Erreur PostgreSQL pool:', err);
});

// Test de connexion
pool.connect((err, client, release) => {
  if (err) {
    logger.error('Erreur lors de la connexion à PostgreSQL:', err);
    process.exit(1);
  }
  release();
  logger.info(`✓ PostgreSQL connecté: ${DATABASE_URL.replace(/:[^:]*@/, ':***@')}`);
});

/**
 * Initialiser la base de données avec les tables nécessaires
 */
async function initDatabase() {
  const client = await pool.connect();

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

    // Table users
    await client.query(`
      CREATE TABLE IF NOT EXISTS users (
        id SERIAL PRIMARY KEY,
        username VARCHAR(255) UNIQUE NOT NULL,
        password_hash VARCHAR(255) NOT NULL,
        is_admin BOOLEAN DEFAULT FALSE,
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
      )
    `);

    // Table notes
    await client.query(`
      CREATE TABLE IF NOT EXISTS notes (
        id SERIAL PRIMARY KEY,
        user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
        title TEXT NOT NULL,
        content TEXT,
        image_filename TEXT,
        archived BOOLEAN DEFAULT FALSE,
        archived_at TIMESTAMP,
        priority INTEGER DEFAULT 0,
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
        updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
      )
    `);

    // Table note_todos
    await client.query(`
      CREATE TABLE IF NOT EXISTS note_todos (
        id SERIAL PRIMARY KEY,
        note_id INTEGER NOT NULL REFERENCES notes(id) ON DELETE CASCADE,
        text TEXT NOT NULL,
        completed BOOLEAN DEFAULT FALSE,
        completed_at TIMESTAMP,
        position INTEGER DEFAULT 0,
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
      )
    `);

    // Table global_todos
    await client.query(`
      CREATE TABLE IF NOT EXISTS global_todos (
        id SERIAL PRIMARY KEY,
        user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
        text TEXT NOT NULL,
        completed BOOLEAN DEFAULT FALSE,
        completed_at TIMESTAMP,
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
      )
    `);

    // Table note_images
    await client.query(`
      CREATE TABLE IF NOT EXISTS note_images (
        id SERIAL PRIMARY KEY,
        note_id INTEGER NOT NULL REFERENCES notes(id) ON DELETE CASCADE,
        filename TEXT NOT NULL,
        original_name TEXT,
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
      )
    `);

    // Table note_files
    await client.query(`
      CREATE TABLE IF NOT EXISTS note_files (
        id SERIAL PRIMARY KEY,
        note_id INTEGER NOT NULL REFERENCES notes(id) ON DELETE CASCADE,
        filename TEXT NOT NULL,
        original_name TEXT NOT NULL,
        file_size INTEGER,
        mime_type TEXT,
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
      )
    `);

    // Table settings
    await client.query(`
      CREATE TABLE IF NOT EXISTS settings (
        id SERIAL PRIMARY KEY,
        key VARCHAR(255) UNIQUE NOT NULL,
        value TEXT,
        updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
      )
    `);

    // Table rss_feeds
    await client.query(`
      CREATE TABLE IF NOT EXISTS rss_feeds (
        id SERIAL PRIMARY KEY,
        url TEXT UNIQUE NOT NULL,
        title TEXT,
        description TEXT,
        enabled BOOLEAN DEFAULT TRUE,
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
        last_fetched_at TIMESTAMP
      )
    `);

    // Table rss_articles
    await client.query(`
      CREATE TABLE IF NOT EXISTS rss_articles (
        id SERIAL PRIMARY KEY,
        feed_id INTEGER NOT NULL REFERENCES rss_feeds(id) ON DELETE CASCADE,
        title TEXT NOT NULL,
        link TEXT UNIQUE NOT NULL,
        description TEXT,
        pub_date TIMESTAMP,
        content TEXT,
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
      )
    `);

    // Table rss_summaries
    await client.query(`
      CREATE TABLE IF NOT EXISTS rss_summaries (
        id SERIAL PRIMARY KEY,
        summary TEXT NOT NULL,
        model TEXT,
        articles_count INTEGER DEFAULT 0,
        feed_title TEXT,
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
      )
    `);

    // Table calendar_events
    await client.query(`
      CREATE TABLE IF NOT EXISTS calendar_events (
        id SERIAL PRIMARY KEY,
        google_event_id VARCHAR(255) UNIQUE NOT NULL,
        user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
        title TEXT NOT NULL,
        description TEXT,
        start_time TIMESTAMP NOT NULL,
        end_time TIMESTAMP NOT NULL,
        location TEXT,
        color_id TEXT,
        html_link TEXT,
        all_day BOOLEAN DEFAULT FALSE,
        synced_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
      )
    `);

    // Table note_tags
    await client.query(`
      CREATE TABLE IF NOT EXISTS note_tags (
        id SERIAL PRIMARY KEY,
        note_id INTEGER NOT NULL REFERENCES notes(id) ON DELETE CASCADE,
        tag VARCHAR(255) NOT NULL,
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
        UNIQUE(note_id, tag)
      )
    `);

    // Table google_oauth_tokens
    await client.query(`
      CREATE TABLE IF NOT EXISTS google_oauth_tokens (
        id SERIAL PRIMARY KEY,
        user_id INTEGER NOT NULL UNIQUE REFERENCES users(id) ON DELETE CASCADE,
        access_token TEXT NOT NULL,
        refresh_token TEXT,
        token_type VARCHAR(50) DEFAULT 'Bearer',
        expiry_date BIGINT,
        scope TEXT,
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
        updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
      )
    `);

    // Créer les index pour la performance
    await client.query('CREATE INDEX IF NOT EXISTS idx_notes_user ON notes(user_id)');
    await client.query('CREATE INDEX IF NOT EXISTS idx_notes_priority ON notes(priority DESC, updated_at DESC)');
    await client.query('CREATE INDEX IF NOT EXISTS idx_note_todos ON note_todos(note_id)');
    await client.query('CREATE INDEX IF NOT EXISTS idx_global_todos_user ON global_todos(user_id)');
    await client.query('CREATE INDEX IF NOT EXISTS idx_note_images ON note_images(note_id)');
    await client.query('CREATE INDEX IF NOT EXISTS idx_note_files ON note_files(note_id)');
    await client.query('CREATE INDEX IF NOT EXISTS idx_note_tags ON note_tags(note_id)');
    await client.query('CREATE INDEX IF NOT EXISTS idx_note_tags_tag ON note_tags(tag)');
    await client.query('CREATE INDEX IF NOT EXISTS idx_settings_key ON settings(key)');
    await client.query('CREATE INDEX IF NOT EXISTS idx_rss_articles_feed ON rss_articles(feed_id)');
    await client.query('CREATE INDEX IF NOT EXISTS idx_rss_articles_date ON rss_articles(pub_date DESC)');
    await client.query('CREATE INDEX IF NOT EXISTS idx_calendar_events_user ON calendar_events(user_id)');
    await client.query('CREATE INDEX IF NOT EXISTS idx_calendar_events_start ON calendar_events(start_time)');

    logger.info('✓ Tables PostgreSQL créées avec succès');

    // Créer les triggers pour mise à jour automatique des dates de purge
    // Trigger pour notes.archived_at
    await client.query(`
      CREATE OR REPLACE FUNCTION update_notes_archived_at()
      RETURNS TRIGGER AS $$
      BEGIN
        IF NEW.archived = TRUE AND OLD.archived = FALSE THEN
          NEW.archived_at = CURRENT_TIMESTAMP;
        ELSIF NEW.archived = FALSE THEN
          NEW.archived_at = NULL;
        END IF;
        RETURN NEW;
      END;
      $$ LANGUAGE plpgsql;
    `);

    await client.query(`
      DROP TRIGGER IF EXISTS trigger_notes_archived_at ON notes;
      CREATE TRIGGER trigger_notes_archived_at
      BEFORE UPDATE ON notes
      FOR EACH ROW
      EXECUTE FUNCTION update_notes_archived_at();
    `);

    // Trigger pour global_todos.completed_at
    await client.query(`
      CREATE OR REPLACE FUNCTION update_global_todos_completed_at()
      RETURNS TRIGGER AS $$
      BEGIN
        IF NEW.completed = TRUE AND OLD.completed = FALSE THEN
          NEW.completed_at = CURRENT_TIMESTAMP;
        ELSIF NEW.completed = FALSE THEN
          NEW.completed_at = NULL;
        END IF;
        RETURN NEW;
      END;
      $$ LANGUAGE plpgsql;
    `);

    await client.query(`
      DROP TRIGGER IF EXISTS trigger_global_todos_completed_at ON global_todos;
      CREATE TRIGGER trigger_global_todos_completed_at
      BEFORE UPDATE ON global_todos
      FOR EACH ROW
      EXECUTE FUNCTION update_global_todos_completed_at();
    `);

    // Trigger pour note_todos.completed_at
    await client.query(`
      CREATE OR REPLACE FUNCTION update_note_todos_completed_at()
      RETURNS TRIGGER AS $$
      BEGIN
        IF NEW.completed = TRUE AND (OLD.completed IS NULL OR OLD.completed = FALSE) THEN
          NEW.completed_at = CURRENT_TIMESTAMP;
        ELSIF NEW.completed = FALSE THEN
          NEW.completed_at = NULL;
        END IF;
        RETURN NEW;
      END;
      $$ LANGUAGE plpgsql;
    `);

    await client.query(`
      DROP TRIGGER IF EXISTS trigger_note_todos_completed_at ON note_todos;
      CREATE TRIGGER trigger_note_todos_completed_at
      BEFORE UPDATE ON note_todos
      FOR EACH ROW
      EXECUTE FUNCTION update_note_todos_completed_at();
    `);

    logger.info('✓ Triggers de purge automatique créés');

    // Créer l'utilisateur admin par défaut si la table est vide
    const usersCount = await client.query('SELECT COUNT(*) as count FROM users');

    if (usersCount.rows[0].count === '0') {
      const defaultPassword = 'admin';
      const passwordHash = await bcrypt.hash(defaultPassword, 12);

      await client.query(
        'INSERT INTO users (username, password_hash, is_admin) VALUES ($1, $2, $3)',
        ['admin', passwordHash, true]
      );

      logger.info('✓ Utilisateur admin créé (username: admin, password: admin)');
      logger.warn('⚠️  IMPORTANT: Changez le mot de passe admin en production!');
    } else {
      logger.info('✓ Base de données déjà initialisée');
    }

    await client.query('COMMIT');
  } catch (error) {
    await client.query('ROLLBACK');
    logger.error('Erreur lors de l\'initialisation de la base de données:', error);
    throw error;
  } finally {
    client.release();
  }
}

/**
 * Exécuter une requête avec promesse
 */
async function runQuery(sql, params = []) {
  const client = await pool.connect();
  try {
    const result = await client.query(sql, params);

    // Si c'est un INSERT/UPDATE avec RETURNING, retourner la ligne complète
    if (result.rows && result.rows.length > 0) {
      logger.info(`[runQuery] Requête avec RETURNING - ID: ${result.rows[0].id}, rowCount: ${result.rowCount}`);
      return {
        ...result.rows[0], // Retourne toutes les colonnes de la première ligne
        changes: result.rowCount
      };
    }

    // Sinon, retourner juste le nombre de lignes affectées
    logger.info(`[runQuery] Requête sans RETURNING - rowCount: ${result.rowCount}`);
    return {
      id: result.rowCount,
      changes: result.rowCount
    };
  } catch (error) {
    logger.error('Erreur runQuery:', error);
    throw error;
  } finally {
    client.release();
  }
}

/**
 * Récupérer une seule ligne
 */
async function getOne(sql, params = []) {
  const client = await pool.connect();
  try {
    const result = await client.query(sql, params);
    return result.rows[0] || null;
  } catch (error) {
    logger.error('Erreur getOne:', error);
    throw error;
  } finally {
    client.release();
  }
}

/**
 * Récupérer toutes les lignes
 */
async function getAll(sql, params = []) {
  const client = await pool.connect();
  try {
    const result = await client.query(sql, params);
    return result.rows;
  } catch (error) {
    logger.error('Erreur getAll:', error);
    throw error;
  } finally {
    client.release();
  }
}

module.exports = {
  pool,
  initDatabase,
  runQuery,
  getOne,
  getAll
};