const crypto = require('crypto');

const provisionSuperAdmin = async ({ pool, transporter, getStartupBaseUrl, retries = 10, delay = 10000 }) => {
  const email = 'suporte@blyzer.com.br';

  for (let i = 0; i < retries; i++) {
    let connection;
    try {
      connection = await pool.getConnection();

      await connection.query(`
        CREATE TABLE IF NOT EXISTS password_resets (
          email varchar(255) NOT NULL,
          token varchar(255) NOT NULL,
          expires_at timestamp NOT NULL,
          created_at timestamp NULL DEFAULT CURRENT_TIMESTAMP,
          PRIMARY KEY (token),
          KEY email (email)
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
      `);

      await connection.query(`
        CREATE TABLE IF NOT EXISTS pending_registrations (
          email varchar(255) NOT NULL,
          password_hash varchar(255) NOT NULL,
          full_name varchar(255) NOT NULL,
          organization_name varchar(255) NOT NULL,
          verification_code varchar(10) NOT NULL,
          expires_at timestamp NOT NULL,
          created_at timestamp NULL DEFAULT CURRENT_TIMESTAMP,
          PRIMARY KEY (email)
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
      `);

      await connection.query(`
        CREATE TABLE IF NOT EXISTS notifications (
          id varchar(36) NOT NULL,
          user_id varchar(36) NOT NULL,
          type enum('success', 'info', 'warning', 'error') DEFAULT 'info',
          title varchar(255) NOT NULL,
          message text NOT NULL,
          link varchar(255) DEFAULT NULL,
          is_read boolean DEFAULT false,
          created_at timestamp NULL DEFAULT CURRENT_TIMESTAMP,
          PRIMARY KEY (id),
          KEY user_id (user_id),
          KEY created_at (created_at)
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
      `);

      try {
        await connection.query('ALTER TABLE users ADD COLUMN slug VARCHAR(255) UNIQUE DEFAULT NULL');
      } catch (err) {
        if (err.code !== 'ER_DUP_FIELDNAME') console.log('Schema update note (slug):', err.message);
      }

      try {
        await connection.query(`UPDATE users SET slug = CONCAT(LOWER(REPLACE(name, ' ', '-')), '-', SUBSTRING(MD5(RAND()), 1, 8)) WHERE slug IS NULL`);
      } catch (err) {
        console.log('Schema update note (populate slugs):', err.message);
      }

      try {
        await connection.query("ALTER TABLE attendances MODIFY COLUMN origin VARCHAR(255) NOT NULL");
      } catch (err) {
        console.log('Schema update note (origin):', err.message);
      }

      try {
        await connection.query("ALTER TABLE attendances MODIFY COLUMN funnel_stage VARCHAR(255) NOT NULL");
      } catch (err) {
        console.log('Schema update note (funnel_stage):', err.message);
      }

      try {
        await connection.query("ALTER TABLE attendances ADD COLUMN full_summary TEXT DEFAULT NULL");
      } catch (err) {
        if (err.code !== 'ER_DUP_FIELDNAME') console.log('Schema update note (full_summary):', err.message);
      }

      await connection.query(`
        CREATE TABLE IF NOT EXISTS origin_groups (
          id varchar(36) NOT NULL,
          tenant_id varchar(36) NOT NULL,
          name varchar(255) NOT NULL,
          created_at timestamp NULL DEFAULT CURRENT_TIMESTAMP,
          PRIMARY KEY (id),
          KEY tenant_id (tenant_id)
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
      `);

      await connection.query(`
        CREATE TABLE IF NOT EXISTS origin_items (
          id varchar(36) NOT NULL,
          origin_group_id varchar(36) NOT NULL,
          name varchar(255) NOT NULL,
          color_class varchar(255) DEFAULT 'bg-zinc-100 text-zinc-800 border-zinc-200',
          created_at timestamp NULL DEFAULT CURRENT_TIMESTAMP,
          PRIMARY KEY (id),
          KEY origin_group_id (origin_group_id)
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
      `);

      try {
        await connection.query("ALTER TABLE origin_items ADD COLUMN color_class VARCHAR(255) DEFAULT 'bg-zinc-100 text-zinc-800 border-zinc-200'");
      } catch (err) {
        if (err.code !== 'ER_DUP_FIELDNAME') console.log('Schema update note (origin_items.color_class):', err.message);
      }

      try {
        await connection.query("ALTER TABLE teams ADD COLUMN origin_group_id VARCHAR(36) DEFAULT NULL");
      } catch (err) {
        if (err.code !== 'ER_DUP_FIELDNAME') console.log('Schema update note (teams.origin_group_id):', err.message);
      }

      try {
        await connection.query("ALTER TABLE attendances RENAME COLUMN summary TO title");
      } catch (err) {
        if (err.code !== 'ER_BAD_FIELD_ERROR' && err.code !== 'ER_DUP_FIELDNAME') {
          try {
            await connection.query("ALTER TABLE attendances CHANGE COLUMN summary title TEXT");
          } catch (e) {
            console.log('Schema update note (summary to title):', e.message);
          }
        }
      }

      await connection.query(`
        CREATE TABLE IF NOT EXISTS funnels (
          id varchar(36) NOT NULL,
          tenant_id varchar(36) NOT NULL,
          name varchar(255) NOT NULL,
          created_at timestamp NULL DEFAULT CURRENT_TIMESTAMP,
          PRIMARY KEY (id),
          KEY tenant_id (tenant_id)
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
      `);

      await connection.query(`
        CREATE TABLE IF NOT EXISTS funnel_stages (
          id varchar(36) NOT NULL,
          funnel_id varchar(36) NOT NULL,
          name varchar(255) NOT NULL,
          color_class varchar(255) DEFAULT 'bg-zinc-100 text-zinc-800 border-zinc-200',
          order_index int DEFAULT 0,
          created_at timestamp NULL DEFAULT CURRENT_TIMESTAMP,
          PRIMARY KEY (id),
          KEY funnel_id (funnel_id)
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
      `);

      await connection.query(`
        CREATE TABLE IF NOT EXISTS api_keys (
          id varchar(36) NOT NULL,
          tenant_id varchar(36) NOT NULL,
          name varchar(255) NOT NULL,
          secret_key varchar(255) NOT NULL,
          secret_hash varchar(64) DEFAULT NULL,
          created_at timestamp NULL DEFAULT CURRENT_TIMESTAMP,
          last_used_at timestamp NULL DEFAULT NULL,
          PRIMARY KEY (id),
          UNIQUE KEY secret_key (secret_key),
          UNIQUE KEY secret_hash (secret_hash),
          KEY tenant_id (tenant_id)
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
      `);

      try {
        await connection.query("ALTER TABLE api_keys ADD COLUMN secret_hash VARCHAR(64) DEFAULT NULL");
      } catch (err) {
        if (err.code !== 'ER_DUP_FIELDNAME') console.log('Schema update note (api_keys.secret_hash):', err.message);
      }

      try {
        await connection.query("ALTER TABLE api_keys ADD UNIQUE KEY secret_hash (secret_hash)");
      } catch (err) {
        if (err.code !== 'ER_DUP_KEYNAME') console.log('Schema update note (api_keys.secret_hash index):', err.message);
      }

      await connection.query(`
        CREATE TABLE IF NOT EXISTS refresh_tokens (
          id varchar(36) NOT NULL,
          user_id varchar(36) NOT NULL,
          token varchar(255) NOT NULL,
          token_hash varchar(64) DEFAULT NULL,
          expires_at timestamp NOT NULL,
          created_at timestamp NULL DEFAULT CURRENT_TIMESTAMP,
          PRIMARY KEY (id),
          UNIQUE KEY token (token),
          UNIQUE KEY token_hash (token_hash),
          KEY user_id (user_id)
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
      `);

      try {
        await connection.query("ALTER TABLE refresh_tokens ADD COLUMN token_hash VARCHAR(64) DEFAULT NULL");
      } catch (err) {
        if (err.code !== 'ER_DUP_FIELDNAME') console.log('Schema update note (refresh_tokens.token_hash):', err.message);
      }

      try {
        await connection.query("ALTER TABLE refresh_tokens ADD UNIQUE KEY token_hash (token_hash)");
      } catch (err) {
        if (err.code !== 'ER_DUP_KEYNAME') console.log('Schema update note (refresh_tokens.token_hash index):', err.message);
      }

      try {
        await connection.query("ALTER TABLE teams ADD COLUMN funnel_id VARCHAR(36) DEFAULT NULL");
      } catch (err) {
        if (err.code !== 'ER_DUP_FIELDNAME') console.log('Schema update note (teams.funnel_id):', err.message);
      }

      connection.release();
      connection = null;

      await pool.query('INSERT IGNORE INTO tenants (id, name, slug, admin_email, status) VALUES (?, ?, ?, ?, ?)', ['system', 'System Admin', 'system', email, 'active']);

      const [existing] = await pool.query('SELECT id, password_hash FROM users WHERE email = ?', [email]);
      if (existing.length === 0 || existing[0].password_hash === 'pending_setup') {
        console.log('Provisioning default super_admin or resending email...');

        if (existing.length === 0) {
          const uid = `u_${crypto.randomUUID().split('-')[0]}`;
          const placeholderHash = 'pending_setup';
          const superAdminSlug = 'suporte-blyzer';

          await pool.query(
            'INSERT INTO users (id, tenant_id, name, email, password_hash, slug, role, status) VALUES (?, ?, ?, ?, ?, ?, ?, ?)',
            [uid, 'system', 'Blyzer Suporte', email, placeholderHash, superAdminSlug, 'super_admin', 'active']
          );
        }

        const token = crypto.randomBytes(32).toString('hex');
        await pool.query('DELETE FROM password_resets WHERE email = ?', [email]);

        await pool.query(
          'INSERT INTO password_resets (email, token, expires_at) VALUES (?, ?, DATE_ADD(NOW(), INTERVAL 15 MINUTE))',
          [email, token]
        );

        const setupLink = `${getStartupBaseUrl()}/#/setup-account?token=${token}`;
        console.log(`\n\n=== SUPER ADMIN SETUP LINK ===\n${setupLink}\n==============================\n\n`);

        await transporter.sendMail({
          from: `"Fasto" <${process.env.MAIL_FROM || 'nao-responda@blyzer.com.br'}>`,
          to: email,
          subject: 'Conta Super Admin Criada - Fasto',
          html: `
            <div style="font-family: sans-serif; max-width: 600px; margin: 0 auto; padding: 20px; border: 1px solid #e2e8f0; border-radius: 12px; background: #ffffff; color: #0f172a;">
              <h2 style="color: #0f172a;">Conta Super Admin Gerada</h2>
              <p style="color: #475569;">Sua conta de suporte (super_admin) foi criada no Fasto.</p>
              <div style="text-align: center; margin: 30px 0;">
                <a href="${setupLink}" style="background-color: #0f172a; color: white; padding: 12px 24px; text-decoration: none; border-radius: 8px; font-weight: bold; display: inline-block;">Finalizar Cadastro</a>
              </div>
              <p style="font-size: 12px; color: #94a3b8;">Este link expira em 15 minutos.</p>
            </div>
          `
        }).catch(err => console.error("Failed to send super_admin email:", err));
      }
      return;
    } catch (error) {
      if (connection) connection.release();
      console.error(`Failed to provision super_admin (Attempt ${i + 1}/${retries}):`, error.message);
      if (i < retries - 1) {
        await new Promise(res => setTimeout(res, delay));
      }
    }
  }
};

module.exports = {
  provisionSuperAdmin,
};