import Database from 'bun:sqlite';
import { drizzle } from 'drizzle-orm/bun-sqlite';
import * as schema from './db/schema/index.js';
import { join, dirname } from 'path';
import { existsSync, mkdirSync, appendFile } from 'fs';
import { fileURLToPath } from 'url';

// ===================================================================
// Configuration
// ===================================================================

// ES module equivalent of __dirname
const __filename = fileURLToPath(import.meta.url);
const __dirname = dirname(__filename);

const isDevelopment = process.env.NODE_ENV !== 'production';

// SECURITY: Require JWT_SECRET in production - no fallback for security
// This prevents JWT token forgery if environment variable is not set
if (!process.env.JWT_SECRET && !isDevelopment) {
  throw new Error(
    'FATAL: JWT_SECRET environment variable must be set in production. ' +
    'Generate one with: openssl rand -base64 32'
  );
}

export const JWT_SECRET = process.env.JWT_SECRET || 'dev-secret-key-change-in-production';
export const LOG_LEVEL = process.env.LOG_LEVEL || (isDevelopment ? 'debug' : 'info');

// ===================================================================
// Logger
// ===================================================================

const logLevels = { debug: 0, info: 1, warn: 2, error: 3 };
const currentLogLevel = logLevels[LOG_LEVEL] ?? 1;

// Log file paths
const logsDir = join(__dirname, '../../logs');
const backendLogFile = join(logsDir, 'backend.log');

// Ensure log directory exists
if (!existsSync(logsDir)) {
  mkdirSync(logsDir, { recursive: true });
}

function formatLogMessage(level, message, data) {
  const timestamp = new Date().toISOString();
  let logMessage = `[${timestamp}] ${level.toUpperCase()}: ${message}`;

  if (data && Object.keys(data).length > 0) {
    logMessage += ' ' + JSON.stringify(data, null, 2);
  }

  return logMessage + '\n';
}

function log(level, message, data) {
  if (logLevels[level] < currentLogLevel) return;

  const logMessage = formatLogMessage(level, message, data);

  // Append to file asynchronously (fire and forget for performance)
  appendFile(backendLogFile, logMessage, (err) => {
    if (err) console.error('Failed to write to log file:', err);
  });

  // Also log to console in development
  if (isDevelopment) {
    const timestamp = new Date().toISOString();
    const consoleMessage = `[${timestamp}] ${level.toUpperCase()}: ${message}`;

    if (data && Object.keys(data).length > 0) {
      console.log(consoleMessage, data);
    } else {
      console.log(consoleMessage);
    }
  }
}

export const logger = {
  debug: (message, data) => log('debug', message, data),
  info: (message, data) => log('info', message, data),
  warn: (message, data) => log('warn', message, data),
  error: (message, data) => log('error', message, data),
};

// Frontend logger - writes to separate log file
const frontendLogFile = join(logsDir, 'frontend.log');

export function logToFrontend(level, message, data = null, context = {}) {
  if (logLevels[level] < currentLogLevel) return;

  const timestamp = new Date().toISOString();
  let logMessage = `[${timestamp}] [${context.userAgent || 'unknown'}] [${context.userId || 'anonymous'}] ${level.toUpperCase()}: ${message}`;

  if (data && Object.keys(data).length > 0) {
    logMessage += ' ' + JSON.stringify(data, null, 2);
  }

  logMessage += '\n';

  // Append to frontend log file
  appendFile(frontendLogFile, logMessage, (err) => {
    if (err) console.error('Failed to write to frontend log file:', err);
  });
}

export default logger;

// ===================================================================
// Database
// ===================================================================

// Get the directory containing this config file, then go to parent for db location
const dbPath = join(__dirname, 'award.db');

const sqlite = new Database(dbPath);
sqlite.exec('PRAGMA foreign_keys = ON');

export const db = drizzle({
  client: sqlite,
  schema,
});

export { sqlite };

export async function closeDatabase() {
  sqlite.close();
}