package botService

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

	"gitea.cybertalant.ru/VisionCareerMiniapp/MiniappGoService/internal/config"
	profileRepository "gitea.cybertalant.ru/VisionCareerMiniapp/MiniappGoService/internal/domains/profile/repository"
	profileService "gitea.cybertalant.ru/VisionCareerMiniapp/MiniappGoService/internal/domains/profile/service"
	profileHandler "gitea.cybertalant.ru/VisionCareerMiniapp/MiniappGoService/internal/infrastructure/botService/handlers/profile"
	tele "gopkg.in/telebot.v4"
)

func Start(
	botCfg *config.Bot,
	loggerInstance loggerInstance,
	pgDBInstance pgDBInstance,
	minioDBInstance minioDBInstance,
	supportAPIInstance supportAPIInstance,
) error {
	// Create bot instance with optimized settings
	bot, err := tele.NewBot(tele.Settings{
		Token: botCfg.BotToken,
		// Optimal number of updates for high load
		Updates: 100,
		// Asynchronous processing for maximum performance
		Synchronous: false,
		// Error handler with error type separation
		OnError: func(err error, c tele.Context) {
			// Filter out common API errors to avoid log spam
			if c == nil {
				log.Printf("🚨 Critical error: %v", err)
				return
			}
			log.Printf("⚠️ Error in update: %v (Chat: %d)", err, c.Chat().ID)
		},
		// Telegram API URL
		URL: "https://api.telegram.org",
		// HTTP client with performance optimizations
		Client: &http.Client{
			Timeout: 30 * time.Second, // Reduced from 50s for faster failover
			Transport: &http.Transport{
				MaxIdleConns:        100,              // Increased for better connection reuse
				MaxIdleConnsPerHost: 20,               // Added for connection pooling
				IdleConnTimeout:     90 * time.Second, // Reduced for faster cleanup
				MaxConnsPerHost:     50,               // Added to limit connections per host
			},
		},
		// Default parse mode for messages
		ParseMode: tele.ModeHTML,
		// Long poller configuration
		Poller: &tele.LongPoller{
			Timeout: 10 * time.Second, // Reduced timeout for faster update retrieval
			AllowedUpdates: []string{
				"message",              // text messages
				"callback_query",       // callback from buttons
				"inline_query",         // inline queries
				"chosen_inline_result", // chosen inline result
				"edited_message",       // edited messages
			},
		},
	})

	if err != nil {
		return err
	}
	// Create repositories
	profileRepository := profileRepository.New(pgDBInstance)
	// Create services
	profileService := profileService.New(loggerInstance, minioDBInstance, supportAPIInstance, profileRepository)
	// Create handlers
	profileHandler := profileHandler.New(bot, loggerInstance, profileService)
	// Init handlers
	profileHandler.Init()
	// Start cron jobs

	// Create channels for graceful shutdown
	errChan := make(chan error, 1)
	quit := make(chan os.Signal, 1)
	signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
	// Start bot in goroutine
	go func() {
		log.Println("🤖 Starting Telegram bot...")
		bot.Start()
	}()
	// Wait for shutdown signal or error
	select {
	case <-quit:
		log.Println("🛑 Received shutdown signal, stopping bot...")
		bot.Stop()
		log.Println("✅ Bot stopped gracefully")
		return nil
	case err := <-errChan:
		log.Printf("❌ Bot error: %v", err)
		return err
	}
}