package main

import (
	"context"
	"fmt"
	"net/http"

	"carrot_bbs/internal/config"
	"carrot_bbs/internal/grpc/runner"
	"carrot_bbs/internal/router"
	"carrot_bbs/internal/service"

	"go.uber.org/zap"
	"gorm.io/gorm"
)

// App 应用程序结构体
type App struct {
	Config        *config.Config
	DB            *gorm.DB
	Router        *router.Router
	PushService   service.PushService
	HotRankWorker *service.HotRankWorker
	GRPCServer    *runner.Server
	Server        *http.Server
	Logger        *zap.Logger
}

// NewApp 创建应用程序
func NewApp(
	cfg *config.Config,
	db *gorm.DB,
	r *router.Router,
	pushService service.PushService,
	hotRankWorker *service.HotRankWorker,
	grpcServer *runner.Server,
	logger *zap.Logger,
) *App {
	return &App{
		Config:        cfg,
		DB:            db,
		Router:        r,
		PushService:   pushService,
		HotRankWorker: hotRankWorker,
		GRPCServer:    grpcServer,
		Logger:        logger,
	}
}

// Start 启动应用程序
func (a *App) Start(ctx context.Context) error {
	// 1. 启动 gRPC 服务器（在 HTTP 服务器之前）
	if a.GRPCServer != nil {
		a.Logger.Info("Starting gRPC server")
		if err := a.GRPCServer.Start(); err != nil {
			return fmt.Errorf("failed to start gRPC server: %w", err)
		}
	}

	// 2. 启动推送 Worker
	a.PushService.StartPushWorker(ctx)

	// 2.1 热门榜定时重算
	if a.HotRankWorker != nil {
		a.HotRankWorker.Start(ctx)
	}

	// 3. 创建 HTTP 服务器
	addr := fmt.Sprintf("%s:%d", a.Config.Server.Host, a.Config.Server.Port)
	a.Logger.Info("Starting HTTP server",
		zap.String("address", addr),
	)

	a.Server = &http.Server{
		Addr:    addr,
		Handler: a.Router.Engine(),
	}

	// 4. 启动 HTTP 服务器
	go func() {
		if err := a.Server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			a.Logger.Fatal("HTTP server listen error",
				zap.Error(err),
			)
		}
	}()

	return nil
}

// Stop 停止应用程序
func (a *App) Stop(ctx context.Context) error {
	a.Logger.Info("Shutting down server")

	// 1. 停止 HTTP 服务器
	if a.Server != nil {
		a.Logger.Info("Stopping HTTP server")
		if err := a.Server.Shutdown(ctx); err != nil {
			a.Logger.Error("HTTP server forced to shutdown",
				zap.Error(err),
			)
		}
	}

	// 2. 停止 gRPC 服务器
	if a.GRPCServer != nil {
		a.Logger.Info("Stopping gRPC server")
		a.GRPCServer.Stop()
	}

	// 3. 停止推送 Worker
	a.Logger.Info("Stopping push worker")
	a.PushService.StopPushWorker()

	if a.HotRankWorker != nil {
		a.Logger.Info("Stopping hot rank worker")
		a.HotRankWorker.Stop()
	}

	// 4. 关闭数据库连接
	a.Logger.Info("Closing database connection")
	sqlDB, err := a.DB.DB()
	if err == nil {
		sqlDB.Close()
	}

	a.Logger.Info("Server exited")
	return nil
}