import Database from 'better-sqlite3';
import path from 'path';
import fs from 'fs';
import crypto from 'crypto';
import { fileURLToPath } from 'url';
import { dirname } from 'path';

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

// ANSI color codes for terminal output
const colors = {
    reset: '\x1b[0m',
    bright: '\x1b[1m',
    cyan: '\x1b[36m',
    dim: '\x1b[2m',
};

const c = {
    info: (text) => `${colors.cyan}${text}${colors.reset}`,
    bright: (text) => `${colors.bright}${text}${colors.reset}`,
    dim: (text) => `${colors.dim}${text}${colors.reset}`,
};

// Use DATABASE_PATH environment variable if set, otherwise use default location
const DB_PATH = process.env.DATABASE_PATH || path.join(__dirname, 'auth.db');
const INIT_SQL_PATH = path.join(__dirname, 'init.sql');

// Ensure database directory exists if custom path is provided
if (process.env.DATABASE_PATH) {
  const dbDir = path.dirname(DB_PATH);
  try {
    if (!fs.existsSync(dbDir)) {
      fs.mkdirSync(dbDir, { recursive: true });
      console.log(`Created database directory: ${dbDir}`);
    }
  } catch (error) {
    console.error(`Failed to create database directory ${dbDir}:`, error.message);
    throw error;
  }
}

// Create database connection
const db = new Database(DB_PATH);

// Show app installation path prominently
const appInstallPath = path.join(__dirname, '../..');
console.log('');
console.log(c.dim('═'.repeat(60)));
console.log(`${c.info('[INFO]')} App Installation: ${c.bright(appInstallPath)}`);
console.log(`${c.info('[INFO]')} Database: ${c.dim(path.relative(appInstallPath, DB_PATH))}`);
if (process.env.DATABASE_PATH) {
  console.log(`       ${c.dim('(Using custom DATABASE_PATH from environment)')}`);
}
console.log(c.dim('═'.repeat(60)));
console.log('');

// Initialize database with schema
const initializeDatabase = async () => {
  try {
    const initSQL = fs.readFileSync(INIT_SQL_PATH, 'utf8');
    db.exec(initSQL);
    console.log('Database initialized successfully');
  } catch (error) {
    console.error('Error initializing database:', error.message);
    throw error;
  }
};

// User database operations
const userDb = {
  // Check if any users exist
  hasUsers: () => {
    try {
      const row = db.prepare('SELECT COUNT(*) as count FROM users').get();
      return row.count > 0;
    } catch (err) {
      throw err;
    }
  },

  // Create a new user
  createUser: (username, passwordHash) => {
    try {
      const stmt = db.prepare('INSERT INTO users (username, password_hash) VALUES (?, ?)');
      const result = stmt.run(username, passwordHash);
      return { id: result.lastInsertRowid, username };
    } catch (err) {
      throw err;
    }
  },

  // Get user by username
  getUserByUsername: (username) => {
    try {
      const row = db.prepare('SELECT * FROM users WHERE username = ? AND is_active = 1').get(username);
      return row;
    } catch (err) {
      throw err;
    }
  },

  // Update last login time
  updateLastLogin: (userId) => {
    try {
      db.prepare('UPDATE users SET last_login = CURRENT_TIMESTAMP WHERE id = ?').run(userId);
    } catch (err) {
      throw err;
    }
  },

  // Get user by ID
  getUserById: (userId) => {
    try {
      const row = db.prepare('SELECT id, username, created_at, last_login FROM users WHERE id = ? AND is_active = 1').get(userId);
      return row;
    } catch (err) {
      throw err;
    }
  },

  getFirstUser: () => {
    try {
      const row = db.prepare('SELECT id, username, created_at, last_login FROM users WHERE is_active = 1 LIMIT 1').get();
      return row;
    } catch (err) {
      throw err;
    }
  }
};

// API Keys database operations
const apiKeysDb = {
  // Generate a new API key
  generateApiKey: () => {
    return 'ck_' + crypto.randomBytes(32).toString('hex');
  },

  // Create a new API key
  createApiKey: (userId, keyName) => {
    try {
      const apiKey = apiKeysDb.generateApiKey();
      const stmt = db.prepare('INSERT INTO api_keys (user_id, key_name, api_key) VALUES (?, ?, ?)');
      const result = stmt.run(userId, keyName, apiKey);
      return { id: result.lastInsertRowid, keyName, apiKey };
    } catch (err) {
      throw err;
    }
  },

  // Get all API keys for a user
  getApiKeys: (userId) => {
    try {
      const rows = db.prepare('SELECT id, key_name, api_key, created_at, last_used, is_active FROM api_keys WHERE user_id = ? ORDER BY created_at DESC').all(userId);
      return rows;
    } catch (err) {
      throw err;
    }
  },

  // Validate API key and get user
  validateApiKey: (apiKey) => {
    try {
      const row = db.prepare(`
        SELECT u.id, u.username, ak.id as api_key_id
        FROM api_keys ak
        JOIN users u ON ak.user_id = u.id
        WHERE ak.api_key = ? AND ak.is_active = 1 AND u.is_active = 1
      `).get(apiKey);

      if (row) {
        // Update last_used timestamp
        db.prepare('UPDATE api_keys SET last_used = CURRENT_TIMESTAMP WHERE id = ?').run(row.api_key_id);
      }

      return row;
    } catch (err) {
      throw err;
    }
  },

  // Delete an API key
  deleteApiKey: (userId, apiKeyId) => {
    try {
      const stmt = db.prepare('DELETE FROM api_keys WHERE id = ? AND user_id = ?');
      const result = stmt.run(apiKeyId, userId);
      return result.changes > 0;
    } catch (err) {
      throw err;
    }
  },

  // Toggle API key active status
  toggleApiKey: (userId, apiKeyId, isActive) => {
    try {
      const stmt = db.prepare('UPDATE api_keys SET is_active = ? WHERE id = ? AND user_id = ?');
      const result = stmt.run(isActive ? 1 : 0, apiKeyId, userId);
      return result.changes > 0;
    } catch (err) {
      throw err;
    }
  }
};

// User credentials database operations (for GitHub tokens, GitLab tokens, etc.)
const credentialsDb = {
  // Create a new credential
  createCredential: (userId, credentialName, credentialType, credentialValue, description = null) => {
    try {
      const stmt = db.prepare('INSERT INTO user_credentials (user_id, credential_name, credential_type, credential_value, description) VALUES (?, ?, ?, ?, ?)');
      const result = stmt.run(userId, credentialName, credentialType, credentialValue, description);
      return { id: result.lastInsertRowid, credentialName, credentialType };
    } catch (err) {
      throw err;
    }
  },

  // Get all credentials for a user, optionally filtered by type
  getCredentials: (userId, credentialType = null) => {
    try {
      let query = 'SELECT id, credential_name, credential_type, description, created_at, is_active FROM user_credentials WHERE user_id = ?';
      const params = [userId];

      if (credentialType) {
        query += ' AND credential_type = ?';
        params.push(credentialType);
      }

      query += ' ORDER BY created_at DESC';

      const rows = db.prepare(query).all(...params);
      return rows;
    } catch (err) {
      throw err;
    }
  },

  // Get active credential value for a user by type (returns most recent active)
  getActiveCredential: (userId, credentialType) => {
    try {
      const row = db.prepare('SELECT credential_value FROM user_credentials WHERE user_id = ? AND credential_type = ? AND is_active = 1 ORDER BY created_at DESC LIMIT 1').get(userId, credentialType);
      return row?.credential_value || null;
    } catch (err) {
      throw err;
    }
  },

  // Delete a credential
  deleteCredential: (userId, credentialId) => {
    try {
      const stmt = db.prepare('DELETE FROM user_credentials WHERE id = ? AND user_id = ?');
      const result = stmt.run(credentialId, userId);
      return result.changes > 0;
    } catch (err) {
      throw err;
    }
  },

  // Toggle credential active status
  toggleCredential: (userId, credentialId, isActive) => {
    try {
      const stmt = db.prepare('UPDATE user_credentials SET is_active = ? WHERE id = ? AND user_id = ?');
      const result = stmt.run(isActive ? 1 : 0, credentialId, userId);
      return result.changes > 0;
    } catch (err) {
      throw err;
    }
  }
};

// Backward compatibility - keep old names pointing to new system
const githubTokensDb = {
  createGithubToken: (userId, tokenName, githubToken, description = null) => {
    return credentialsDb.createCredential(userId, tokenName, 'github_token', githubToken, description);
  },
  getGithubTokens: (userId) => {
    return credentialsDb.getCredentials(userId, 'github_token');
  },
  getActiveGithubToken: (userId) => {
    return credentialsDb.getActiveCredential(userId, 'github_token');
  },
  deleteGithubToken: (userId, tokenId) => {
    return credentialsDb.deleteCredential(userId, tokenId);
  },
  toggleGithubToken: (userId, tokenId, isActive) => {
    return credentialsDb.toggleCredential(userId, tokenId, isActive);
  }
};

export {
  db,
  initializeDatabase,
  userDb,
  apiKeysDb,
  credentialsDb,
  githubTokensDb // Backward compatibility
};