// ===========================================
// 多班级版班级管理系统 - Go 后端
//
// 开发者: Canglan
// 联系方式: admin@sea-studio.top
// 版权归属: Sea Network Technology Studio
// 许可证: Apache License 2.0
//
// 版权所有 © Sea Network Technology Studio
// ===========================================

package main

import (
	"context"
	"fmt"
	"net/http"
	"os"
	"os/signal"
	"syscall"
	"time"

	"hz-gitea.sea-studio.top/canglan/SharedClassManager/internal/config"
	"hz-gitea.sea-studio.top/canglan/SharedClassManager/internal/handler"
	"hz-gitea.sea-studio.top/canglan/SharedClassManager/internal/repository"
	"hz-gitea.sea-studio.top/canglan/SharedClassManager/internal/router"
	"hz-gitea.sea-studio.top/canglan/SharedClassManager/internal/service"
	"hz-gitea.sea-studio.top/canglan/SharedClassManager/pkg/database"
	"hz-gitea.sea-studio.top/canglan/SharedClassManager/pkg/logger"
)

func main() {
	// ========== 1. 加载配置 ==========
	cfg, err := config.Load()
	if err != nil {
		fmt.Fprintf(os.Stderr, "加载配置失败: %v\n", err)
		os.Exit(1)
	}

	// ========== 2. 初始化日志 ==========
	logger.Init(cfg.LogLevel, cfg.IsProduction())
	defer logger.Sync()

	logger.Sugared.Infof("应用启动: %s (env=%s, port=%s)", cfg.AppName, cfg.AppEnv, cfg.AppPort)

	// ========== 3. 初始化 MySQL ==========
	mysqlDB, err := database.InitMySQL(cfg)
	if err != nil {
		logger.Sugared.Fatalf("初始化 MySQL 失败: %v", err)
	}
	logger.Sugared.Info("MySQL 连接成功")

	sqlDB, err := mysqlDB.DB()
	if err != nil {
		logger.Sugared.Fatalf("获取 sql.DB 失败: %v", err)
	}
	defer sqlDB.Close()

	// ========== 4. 初始化 Redis ==========
	redisClient, err := database.InitRedis(cfg)
	if err != nil {
		logger.Sugared.Fatalf("初始化 Redis 失败: %v", err)
	}
	logger.Sugared.Info("Redis 连接成功")
	defer redisClient.Close()

	// ========== 5. 初始化 Repository 层 ==========
	userRepo := repository.NewUserRepo(mysqlDB)
	studentRepo := repository.NewStudentRepo(mysqlDB)
	adminRoleRepo := repository.NewAdminRoleRepo(mysqlDB)
	classRepo := repository.NewClassRepo(mysqlDB)
	conductRepo := repository.NewConductRepo(mysqlDB)
	attendanceRepo := repository.NewAttendanceRepo(mysqlDB)
	semesterRepo := repository.NewSemesterRepo(mysqlDB)
	subjectRepo := repository.NewSubjectRepo(mysqlDB)
	assignmentRepo := repository.NewAssignmentRepo(mysqlDB)
	logRepo := repository.NewLogRepo(mysqlDB)
	superAdminRepo := repository.NewSuperAdminRepo(mysqlDB)
	settingRepo := repository.NewSystemSettingRepo(mysqlDB)

	// ========== 6. 初始化 Service 层 ==========
	logService := service.NewLogService(logRepo)

	authService := service.NewAuthService(
		userRepo, studentRepo, adminRoleRepo, classRepo, logService,
	)
	adminService := service.NewAdminService(
		userRepo, studentRepo, adminRoleRepo, classRepo,
	)
	conductService := service.NewConductService(
		conductRepo, studentRepo, adminRoleRepo, semesterRepo, classRepo,
	)
	attendanceService := service.NewAttendanceService(
		attendanceRepo, studentRepo, userRepo, conductRepo, semesterRepo, settingRepo, classRepo,
	)
	semesterService := service.NewSemesterService(
		semesterRepo, studentRepo, classRepo, attendanceRepo, assignmentRepo, logService,
	)
	classService := service.NewClassService(
		classRepo, userRepo, adminRoleRepo,
	)
	subjectService := service.NewSubjectService(subjectRepo)
	studentService := service.NewStudentService(
		studentRepo, conductRepo, attendanceRepo, semesterRepo,
	)
	parentService := service.NewParentService(
		userRepo, studentRepo, conductRepo, attendanceRepo,
	)
	rankingService := service.NewRankingService(
		studentRepo, conductRepo,
	)
	superAdminService := service.NewSuperAdminService(superAdminRepo, logService)
	configService := service.NewConfigService(classRepo)

	// 确保默认超级管理员存在
	if err := superAdminService.EnsureDefaultAdmin(); err != nil {
		logger.Sugared.Errorf("初始化默认超级管理员失败: %v", err)
	}

	// ========== 7. 初始化 Handler 层 ==========
	handlers := &router.Handlers{
		Auth:       handler.NewAuthHandler(authService, superAdminService),
		Admin:      handler.NewAdminHandler(adminService, conductService, attendanceService, rankingService, logService),
		Student:    handler.NewStudentHandler(studentService, classRepo),
		Parent:     handler.NewParentHandler(parentService, authService, classService),
		Subject:    handler.NewSubjectHandler(subjectService),
		Semester:   handler.NewSemesterHandler(semesterService),
		Class:      handler.NewClassHandler(classService),
		Config:     handler.NewConfigHandler(configService),
		SuperAdmin: handler.NewSuperAdminHandler(superAdminService),
		Cadre:      handler.NewCadreHandler(assignmentRepo, conductService, adminRoleRepo),
	}

	// ========== 8. 初始化路由 ==========
	r := router.SetupRouter(cfg, handlers)

	// ========== 9. 启动 HTTP 服务 ==========
	addr := fmt.Sprintf(":%s", cfg.AppPort)
	srv := &http.Server{
		Addr:         addr,
		Handler:      r,
		ReadTimeout:  30 * time.Second,
		WriteTimeout: 60 * time.Second,
		IdleTimeout:  120 * time.Second,
	}

	// 优雅关闭
	go func() {
		logger.Sugared.Infof("HTTP 服务启动: http://0.0.0.0%s", addr)
		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			logger.Sugared.Fatalf("HTTP 服务异常: %v", err)
		}
	}()

	// ========== 10. 等待中断信号 ==========
	quit := make(chan os.Signal, 1)
	signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)

	// ========== 自动周期重置定时任务 ==========
	// 每天凌晨 1:00 检查是否有班级需要执行周/月重置
	// 使用独立 done 通道避免与 quit 通道的竞态条件
	timerDone := make(chan struct{})
	go func() {
		runAutoPeriodReset := func() {
			defer func() {
				if r := recover(); r != nil {
					logger.Sugared.Errorf("自动周期重置 panic: %v", r)
				}
			}()
			semesterService.AutoPeriodReset()
		}

		// 计算距离下一个凌晨 1:00 的等待时间
		waitUntilNext1AM := func() time.Duration {
			now := time.Now()
			next := time.Date(now.Year(), now.Month(), now.Day(), 1, 0, 0, 0, now.Location())
			if now.After(next) {
				next = next.Add(24 * time.Hour)
			}
			return next.Sub(now)
		}

		timer := time.NewTimer(waitUntilNext1AM())
		defer timer.Stop()

		for {
			select {
			case <-timerDone:
				logger.Sugared.Info("定时任务收到退出信号，停止")
				return
			case <-timer.C:
				runAutoPeriodReset()
				timer.Reset(24 * time.Hour)
			}
		}
	}()

	sig := <-quit
	close(timerDone)
	logger.Sugared.Infof("收到信号 %v，正在关闭服务...", sig)

	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer cancel()

	if err := srv.Shutdown(ctx); err != nil {
		logger.Sugared.Errorf("服务关闭异常: %v", err)
	}

	logger.Sugared.Info("服务已安全停止")
}