package main

import (
	"context"
	"os"
	"os/signal"
	"strconv"
	"syscall"

	"github.com/bytedance/sonic"
	"github.com/gofiber/fiber/v2"
	"github.com/gofiber/fiber/v2/middleware/compress"
	"github.com/gofiber/fiber/v2/middleware/requestid"
	"github.com/google/uuid"
	"github.com/redis/go-redis/v9"
	"go.uber.org/zap"

	"github.com/break/junhong_cmp_fiber/internal/handler"
	"github.com/break/junhong_cmp_fiber/internal/middleware"
	"github.com/break/junhong_cmp_fiber/pkg/config"
	"github.com/break/junhong_cmp_fiber/pkg/logger"
	"github.com/break/junhong_cmp_fiber/pkg/validator"
)

func main() {
	// 加载配置
	cfg, err := config.Load()
	if err != nil {
		panic("加载配置失败: " + err.Error())
	}

	// 初始化日志
	if err := logger.InitLoggers(
		cfg.Logging.Level,
		cfg.Logging.Development,
		logger.LogRotationConfig{
			Filename:   cfg.Logging.AppLog.Filename,
			MaxSize:    cfg.Logging.AppLog.MaxSize,
			MaxBackups: cfg.Logging.AppLog.MaxBackups,
			MaxAge:     cfg.Logging.AppLog.MaxAge,
			Compress:   cfg.Logging.AppLog.Compress,
		},
		logger.LogRotationConfig{
			Filename:   cfg.Logging.AccessLog.Filename,
			MaxSize:    cfg.Logging.AccessLog.MaxSize,
			MaxBackups: cfg.Logging.AccessLog.MaxBackups,
			MaxAge:     cfg.Logging.AccessLog.MaxAge,
			Compress:   cfg.Logging.AccessLog.Compress,
		},
	); err != nil {
		panic("初始化日志失败: " + err.Error())
	}
	defer func() {
		_ = logger.Sync() // 忽略 sync 错误（shutdown 时可能已经关闭）
	}()

	appLogger := logger.GetAppLogger()
	appLogger.Info("应用程序启动中...",
		zap.String("address", cfg.Server.Address),
	)
	redisAddr := cfg.Redis.Address + ":" + strconv.Itoa(cfg.Redis.Port)
	// 连接 Redis
	redisClient := redis.NewClient(&redis.Options{
		Addr:         redisAddr,
		Password:     cfg.Redis.Password,
		DB:           cfg.Redis.DB,
		PoolSize:     cfg.Redis.PoolSize,
		MinIdleConns: cfg.Redis.MinIdleConns,
		DialTimeout:  cfg.Redis.DialTimeout,
		ReadTimeout:  cfg.Redis.ReadTimeout,
		WriteTimeout: cfg.Redis.WriteTimeout,
	})
	defer func() {
		if err := redisClient.Close(); err != nil {
			appLogger.Error("关闭 Redis 客户端失败", zap.Error(err))
		}
	}()

	// 测试 Redis 连接
	ctx := context.Background()
	if err := redisClient.Ping(ctx).Err(); err != nil {
		appLogger.Fatal("连接 Redis 失败", zap.Error(err))
	}
	appLogger.Info("Redis 已连接", zap.String("address", redisAddr))

	// 创建令牌验证器
	tokenValidator := validator.NewTokenValidator(redisClient, appLogger)

	// 启动配置文件监听器（热重载）
	watchCtx, cancelWatch := context.WithCancel(context.Background())
	defer cancelWatch()
	go config.Watch(watchCtx, appLogger)

	// 创建 Fiber 应用
	app := fiber.New(fiber.Config{
		AppName:       "君鸿卡管系统 v1.0.0",
		StrictRouting: true,
		CaseSensitive: true,
		JSONEncoder:   sonic.Marshal,
		JSONDecoder:   sonic.Unmarshal,
		Prefork:       cfg.Server.Prefork,
		ReadTimeout:   cfg.Server.ReadTimeout,
		WriteTimeout:  cfg.Server.WriteTimeout,
	})

	// 中间件注册（顺序很重要）
	// 1. Recover - 必须第一个，捕获所有 panic
	app.Use(middleware.Recover(appLogger))

	// 2. RequestID - 为每个请求生成唯一 ID
	app.Use(requestid.New(requestid.Config{
		Generator: func() string {
			return uuid.NewString()
		},
	}))

	// 3. Logger - 记录所有请求
	app.Use(logger.Middleware())

	// 4. Compress - 响应压缩
	app.Use(compress.New(compress.Config{
		Level: compress.LevelDefault,
	}))

	// 路由注册

	// 公共端点（无需认证）
	app.Get("/health", handler.HealthCheck)

	// API v1 路由组
	v1 := app.Group("/api/v1")

	// 受保护的端点（需要认证）
	if cfg.Middleware.EnableAuth {
		v1.Use(middleware.KeyAuth(tokenValidator, appLogger))
	}

	// 可选：启用限流器
	if cfg.Middleware.EnableRateLimiter {
		var rateLimitStorage fiber.Storage

		// 根据配置选择存储后端
		if cfg.Middleware.RateLimiter.Storage == "redis" {
			rateLimitStorage = middleware.NewRedisStorage(
				cfg.Redis.Address,
				cfg.Redis.Password,
				cfg.Redis.DB,
				cfg.Redis.Port,
			)
			appLogger.Info("限流器使用 Redis 存储", zap.String("redis_address", cfg.Redis.Address))
		} else {
			rateLimitStorage = nil // 使用内存存储
			appLogger.Info("限流器使用内存存储")
		}

		v1.Use(middleware.RateLimiter(
			cfg.Middleware.RateLimiter.Max,
			cfg.Middleware.RateLimiter.Expiration,
			rateLimitStorage,
		))
	}

	// 注册受保护的路由
	v1.Get("/users", handler.GetUsers)

	// 优雅关闭
	quit := make(chan os.Signal, 1)
	signal.Notify(quit, os.Interrupt, syscall.SIGTERM)

	go func() {
		if err := app.Listen(cfg.Server.Address); err != nil {
			appLogger.Fatal("服务器启动失败", zap.Error(err))
		}
	}()

	appLogger.Info("服务器已启动", zap.String("address", cfg.Server.Address))

	// 等待关闭信号
	<-quit
	appLogger.Info("正在关闭服务器...")

	// 取消配置监听器
	cancelWatch()

	// 关闭 HTTP 服务器
	if err := app.ShutdownWithTimeout(cfg.Server.ShutdownTimeout); err != nil {
		appLogger.Error("强制关闭服务器", zap.Error(err))
	}

	appLogger.Info("服务器已停止")
}