新增資料庫、用戶註冊、登入的功能

lib/logger.ts

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+import fs from 'fs';
+import path from 'path';
+
+// 日誌級別
+export enum LogLevel {
+  ERROR = 0,
+  WARN = 1,
+  INFO = 2,
+  DEBUG = 3
+}
+
+// 日誌配置
+const LOG_LEVEL = (process.env.LOG_LEVEL as LogLevel) || LogLevel.INFO;
+const LOG_FILE = process.env.LOG_FILE || './logs/app.log';
+
+// 確保日誌目錄存在
+const logDir = path.dirname(LOG_FILE);
+if (!fs.existsSync(logDir)) {
+  fs.mkdirSync(logDir, { recursive: true });
+}
+
+// 日誌顏色
+const colors = {
+  reset: '\x1b[0m',
+  red: '\x1b[31m',
+  yellow: '\x1b[33m',
+  green: '\x1b[32m',
+  blue: '\x1b[34m',
+  magenta: '\x1b[35m',
+  cyan: '\x1b[36m'
+};
+
+// 日誌級別名稱
+const levelNames = {
+  [LogLevel.ERROR]: 'ERROR',
+  [LogLevel.WARN]: 'WARN',
+  [LogLevel.INFO]: 'INFO',
+  [LogLevel.DEBUG]: 'DEBUG'
+};
+
+// 日誌級別顏色
+const levelColors = {
+  [LogLevel.ERROR]: colors.red,
+  [LogLevel.WARN]: colors.yellow,
+  [LogLevel.INFO]: colors.green,
+  [LogLevel.DEBUG]: colors.blue
+};
+
+// 寫入檔案日誌
+function writeToFile(level: LogLevel, message: string, data?: any) {
+  const timestamp = new Date().toISOString();
+  const levelName = levelNames[level];
+  const logEntry = {
+    timestamp,
+    level: levelName,
+    message,
+    data: data || null
+  };
+
+  const logLine = JSON.stringify(logEntry) + '\n';
+  
+  try {
+    fs.appendFileSync(LOG_FILE, logLine);
+  } catch (error) {
+    console.error('Failed to write to log file:', error);
+  }
+}
+
+// 控制台輸出
+function consoleOutput(level: LogLevel, message: string, data?: any) {
+  const timestamp = new Date().toISOString();
+  const levelName = levelNames[level];
+  const color = levelColors[level];
+  
+  let output = `${color}[${levelName}]${colors.reset} ${timestamp} - ${message}`;
+  
+  if (data) {
+    output += `\n${color}Data:${colors.reset} ${JSON.stringify(data, null, 2)}`;
+  }
+  
+  console.log(output);
+}
+
+// 主日誌函數
+function log(level: LogLevel, message: string, data?: any) {
+  if (level <= LOG_LEVEL) {
+    consoleOutput(level, message, data);
+    writeToFile(level, message, data);
+  }
+}
+
+// 日誌類別
+export class Logger {
+  private context: string;
+
+  constructor(context: string = 'App') {
+    this.context = context;
+  }
+
+  error(message: string, data?: any) {
+    log(LogLevel.ERROR, `[${this.context}] ${message}`, data);
+  }
+
+  warn(message: string, data?: any) {
+    log(LogLevel.WARN, `[${this.context}] ${message}`, data);
+  }
+
+  info(message: string, data?: any) {
+    log(LogLevel.INFO, `[${this.context}] ${message}`, data);
+  }
+
+  debug(message: string, data?: any) {
+    log(LogLevel.DEBUG, `[${this.context}] ${message}`, data);
+  }
+
+  // API 請求日誌
+  logRequest(method: string, url: string, statusCode: number, duration: number, userId?: string) {
+    this.info('API Request', {
+      method,
+      url,
+      statusCode,
+      duration: `${duration}ms`,
+      userId
+    });
+  }
+
+  // 認證日誌
+  logAuth(action: string, email: string, success: boolean, ip?: string) {
+    this.info('Authentication', {
+      action,
+      email,
+      success,
+      ip
+    });
+  }
+
+  // 資料庫操作日誌
+  logDatabase(operation: string, table: string, duration: number, success: boolean) {
+    this.debug('Database Operation', {
+      operation,
+      table,
+      duration: `${duration}ms`,
+      success
+    });
+  }
+
+  // 錯誤日誌
+  logError(error: Error, context?: string) {
+    this.error('Application Error', {
+      message: error.message,
+      stack: error.stack,
+      context: context || this.context
+    });
+  }
+}
+
+// 預設日誌實例
+export const logger = new Logger();
+
+// 建立特定上下文的日誌實例
+export function createLogger(context: string): Logger {
+  return new Logger(context);
+}