package main

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

	"github.com/gin-gonic/gin"
	"golang.org/x/time/rate"

	"tencent_ocr/pkg/config"
	"tencent_ocr/pkg/handler"
	"tencent_ocr/pkg/middleware"
	"tencent_ocr/pkg/service"
)

func main() {
	// Load configuration
	cfg, err := config.LoadConfig()
	if err != nil {
		log.Fatalf("Failed to load configuration: %v", err)
	}

	// Initialize services
	ocrService, err := service.NewOCRService(cfg.TencentSecretID, cfg.TencentSecretKey)
	if err != nil {
		log.Fatalf("Failed to initialize OCR service: %v", err)
	}
	defer ocrService.Close()

	geminiService, err := service.NewGeminiService(cfg.GeminiAPIKey)
	if err != nil {
		log.Fatalf("Failed to initialize Gemini service: %v", err)
	}
	defer geminiService.Close()

	uploadService, err := service.NewUploadService(
		cfg.R2AccessKey,
		cfg.R2SecretKey,
		cfg.R2Bucket,
		cfg.R2Endpoint,
		cfg.R2CustomDomain,
	)
	if err != nil {
		log.Fatalf("Failed to initialize upload service: %v", err)
	}
	defer uploadService.Close()

	// Initialize handlers
	ocrHandler := handler.NewOCRHandler(ocrService, geminiService)
	rateHandler := handler.NewRateHandler(geminiService)
	uploadHandler := handler.NewUploadHandler(uploadService, ocrService, geminiService)

	// Setup Gin router
	r := gin.Default()

	// Add middleware
	r.Use(middleware.APIKeyAuth(cfg.APIKey))
	r.Use(middleware.RateLimit(rate.Limit(10), 20)) // 10 requests per second with burst of 20

	// Register routes
	r.POST("/ocr", ocrHandler.HandleOCR)
	r.POST("/rate", rateHandler.HandleRate)
	r.POST("/upload", uploadHandler.HandleUpload)

	// Create server with graceful shutdown
	srv := &http.Server{
		Addr:    "localhost:8080",
		Handler: r,
	}

	// Graceful shutdown
	go func() {
		quit := make(chan os.Signal, 1)
		signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
		<-quit
		log.Println("Shutting down server...")

		ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
		defer cancel()

		if err := srv.Shutdown(ctx); err != nil {
			log.Fatal("Server forced to shutdown:", err)
		}
	}()

	log.Println("Server starting on localhost:8080")
	if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
		log.Fatalf("Failed to start server: %v", err)
	}
}