package main

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

	"github.com/rs/zerolog/log"
	"gorm.io/gorm"

	"github.com/treytartt/casera-api/internal/config"
	"github.com/treytartt/casera-api/internal/database"
	"github.com/treytartt/casera-api/internal/push"
	"github.com/treytartt/casera-api/internal/router"
	"github.com/treytartt/casera-api/internal/services"
	"github.com/treytartt/casera-api/pkg/utils"
)

func main() {
	// Load configuration
	cfg, err := config.Load()
	if err != nil {
		fmt.Printf("Failed to load configuration: %v\n", err)
		os.Exit(1)
	}

	// Initialize logger
	utils.InitLogger(cfg.Server.Debug)

	log.Info().
		Bool("debug", cfg.Server.Debug).
		Int("port", cfg.Server.Port).
		Str("db_host", cfg.Database.Host).
		Int("db_port", cfg.Database.Port).
		Str("db_name", cfg.Database.Database).
		Str("db_user", cfg.Database.User).
		Str("redis_url", cfg.Redis.URL).
		Msg("Starting MyCrib API server")

	// Connect to database (retry with backoff)
	var db *gorm.DB
	var dbErr error
	for i := 0; i < 3; i++ {
		db, dbErr = database.Connect(&cfg.Database, cfg.Server.Debug)
		if dbErr == nil {
			break
		}
		log.Warn().Err(dbErr).Int("attempt", i+1).Msg("Failed to connect to database, retrying...")
		time.Sleep(time.Duration(i+1) * time.Second)
	}
	if dbErr != nil {
		log.Error().Err(dbErr).Msg("Failed to connect to database - API will start but database operations will fail")
	} else {
		defer database.Close()
		// Run database migrations only if connected
		if err := database.Migrate(); err != nil {
			log.Error().Err(err).Msg("Failed to run database migrations")
		}
	}

	// Connect to Redis (optional - don't fail if unavailable)
	var cache *services.CacheService
	cache, err = services.NewCacheService(&cfg.Redis)
	if err != nil {
		log.Warn().Err(err).Msg("Failed to connect to Redis - caching disabled")
		cache = nil
	} else {
		defer cache.Close()
	}

	// Initialize email service
	var emailService *services.EmailService
	log.Info().
		Str("email_host", cfg.Email.Host).
		Str("email_user", cfg.Email.User).
		Str("email_from", cfg.Email.From).
		Int("email_port", cfg.Email.Port).
		Msg("Email config loaded")
	if cfg.Email.Host != "" && cfg.Email.User != "" {
		emailService = services.NewEmailService(&cfg.Email)
		log.Info().
			Str("host", cfg.Email.Host).
			Msg("Email service initialized")
	} else {
		log.Warn().
			Str("host", cfg.Email.Host).
			Str("user", cfg.Email.User).
			Msg("Email service not configured - emails will not be sent")
	}

	// Initialize storage service for file uploads
	var storageService *services.StorageService
	if cfg.Storage.UploadDir != "" {
		storageService, err = services.NewStorageService(&cfg.Storage)
		if err != nil {
			log.Warn().Err(err).Msg("Failed to initialize storage service - uploads disabled")
		} else {
			log.Info().
				Str("upload_dir", cfg.Storage.UploadDir).
				Str("base_url", cfg.Storage.BaseURL).
				Int64("max_file_size", cfg.Storage.MaxFileSize).
				Msg("Storage service initialized")
		}
	}

	// Initialize PDF service for report generation
	pdfService := services.NewPDFService()
	log.Info().Msg("PDF service initialized")

	// Initialize push notification client (APNs + FCM)
	var pushClient *push.Client
	pushClient, err = push.NewClient(&cfg.Push)
	if err != nil {
		log.Warn().Err(err).Msg("Failed to initialize push client - push notifications disabled")
	} else {
		log.Info().
			Bool("ios_enabled", pushClient.IsIOSEnabled()).
			Bool("android_enabled", pushClient.IsAndroidEnabled()).
			Msg("Push notification client initialized")
	}

	// Setup router with dependencies (includes admin panel at /admin)
	deps := &router.Dependencies{
		DB:             db,
		Cache:          cache,
		Config:         cfg,
		EmailService:   emailService,
		PDFService:     pdfService,
		PushClient:     pushClient,
		StorageService: storageService,
	}
	r := router.SetupRouter(deps)

	// Create HTTP server
	srv := &http.Server{
		Addr:         fmt.Sprintf(":%d", cfg.Server.Port),
		Handler:      r,
		ReadTimeout:  30 * time.Second,
		WriteTimeout: 30 * time.Second,
		IdleTimeout:  60 * time.Second,
	}

	// Start server in goroutine
	go func() {
		log.Info().
			Str("addr", srv.Addr).
			Msg("HTTP server listening")

		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			log.Fatal().Err(err).Msg("Failed to start HTTP server")
		}
	}()

	// Wait for interrupt signal for graceful shutdown
	quit := make(chan os.Signal, 1)
	signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
	<-quit

	log.Info().Msg("Shutting down server...")

	// Graceful shutdown with timeout
	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
	defer cancel()

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

	log.Info().Msg("Server exited")
}