package main

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

	"git.warky.dev/wdevs/whatshooked/internal/config"
	"git.warky.dev/wdevs/whatshooked/internal/eventlogger"
	"git.warky.dev/wdevs/whatshooked/internal/events"
	"git.warky.dev/wdevs/whatshooked/internal/hooks"
	"git.warky.dev/wdevs/whatshooked/internal/logging"
	"git.warky.dev/wdevs/whatshooked/internal/utils"
	"git.warky.dev/wdevs/whatshooked/internal/whatsapp"
	"go.mau.fi/whatsmeow/types"
)

var (
	configPath = flag.String("config", "", "Path to configuration file (optional, defaults to user home directory)")
)

type Server struct {
	config      *config.Config
	configPath  string
	whatsappMgr *whatsapp.Manager
	hookMgr     *hooks.Manager
	httpServer  *http.Server
	eventBus    *events.EventBus
	eventLogger *eventlogger.Logger
}

// resolveConfigPath determines the config file path to use
// Priority: 1) provided path (if exists), 2) config.json in current dir, 3) .whatshooked/config.json in user home
func resolveConfigPath(providedPath string) (string, error) {
	// If a path was explicitly provided, check if it exists
	if providedPath != "" {
		if _, err := os.Stat(providedPath); err == nil {
			return providedPath, nil
		}
		// Directory doesn't exist, fall through to default locations
		logging.Info("Provided config path directory does not exist, using default locations", "path", providedPath)
	}

	// Check for config.json in current directory
	currentDirConfig := "config.json"
	if _, err := os.Stat(currentDirConfig); err == nil {
		return currentDirConfig, nil
	}

	// Fall back to user home directory
	homeDir, err := os.UserHomeDir()
	if err != nil {
		return "", fmt.Errorf("failed to get user home directory: %w", err)
	}

	// Create .whatshooked directory if it doesn't exist
	configDir := filepath.Join(homeDir, ".whatshooked")
	if err := os.MkdirAll(configDir, 0755); err != nil {
		return "", fmt.Errorf("failed to create config directory: %w", err)
	}

	return filepath.Join(configDir, "config.json"), nil
}

func main() {
	flag.Parse()

	// Resolve config path
	cfgPath, err := resolveConfigPath(*configPath)
	if err != nil {
		fmt.Fprintf(os.Stderr, "Failed to resolve config path: %v\n", err)
		os.Exit(1)
	}

	// Load configuration
	cfg, err := config.Load(cfgPath)
	if err != nil {
		fmt.Fprintf(os.Stderr, "Failed to load config from %s: %v\n", cfgPath, err)
		os.Exit(1)
	}

	// Initialize logging
	logging.Init(cfg.LogLevel)
	logging.Info("Starting WhatsHooked server", "config_path", cfgPath)

	// Create event bus
	eventBus := events.NewEventBus()

	// Create server with config update callback
	srv := &Server{
		config:     cfg,
		configPath: cfgPath,
		eventBus:   eventBus,
		whatsappMgr: whatsapp.NewManager(eventBus, cfg.Media, cfg, cfgPath, func(updatedCfg *config.Config) error {
			return config.Save(cfgPath, updatedCfg)
		}),
		hookMgr: hooks.NewManager(eventBus),
	}

	// Initialize event logger if enabled
	if cfg.EventLogger.Enabled && len(cfg.EventLogger.Targets) > 0 {
		evtLogger, err := eventlogger.NewLogger(cfg.EventLogger, cfg.Database)
		if err != nil {
			logging.Error("Failed to initialize event logger", "error", err)
		} else {
			srv.eventLogger = evtLogger
			// Subscribe to all events
			srv.eventBus.SubscribeAll(func(event events.Event) {
				srv.eventLogger.Log(event)
			})
			logging.Info("Event logger initialized", "targets", cfg.EventLogger.Targets)
		}
	}

	// Load hooks
	srv.hookMgr.LoadHooks(cfg.Hooks)

	// Start hook manager to listen for events
	srv.hookMgr.Start()

	// Subscribe to hook success events to handle webhook responses
	srv.eventBus.Subscribe(events.EventHookSuccess, srv.handleHookResponse)

	// Start HTTP server for CLI BEFORE connecting to WhatsApp
	// This ensures all infrastructure is ready before events start flowing
	srv.startHTTPServer()

	// Give HTTP server a moment to start
	time.Sleep(100 * time.Millisecond)
	logging.Info("HTTP server ready, connecting to WhatsApp accounts")

	// Connect to WhatsApp accounts
	ctx := context.Background()
	for _, waCfg := range cfg.WhatsApp {
		if err := srv.whatsappMgr.Connect(ctx, waCfg); err != nil {
			logging.Error("Failed to connect to WhatsApp", "account_id", waCfg.ID, "error", err)
		}
	}

	// Wait for interrupt signal
	sigChan := make(chan os.Signal, 1)
	signal.Notify(sigChan, os.Interrupt, syscall.SIGTERM)
	<-sigChan

	logging.Info("Shutting down server")

	// Graceful shutdown
	shutdownCtx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer cancel()

	if srv.httpServer != nil {
		srv.httpServer.Shutdown(shutdownCtx)
	}

	srv.whatsappMgr.DisconnectAll()

	// Close event logger
	if srv.eventLogger != nil {
		if err := srv.eventLogger.Close(); err != nil {
			logging.Error("Failed to close event logger", "error", err)
		}
	}

	logging.Info("Server stopped")
}

// handleHookResponse processes hook success events to handle two-way communication
func (s *Server) handleHookResponse(event events.Event) {
	// Use event context for sending message
	ctx := event.Context
	if ctx == nil {
		ctx = context.Background()
	}

	// Extract response from event data
	responseData, ok := event.Data["response"]
	if !ok || responseData == nil {
		return
	}

	// Try to cast to HookResponse
	resp, ok := responseData.(hooks.HookResponse)
	if !ok {
		return
	}

	if !resp.SendMessage {
		return
	}

	// Determine which account to use - default to first available if not specified
	targetAccountID := resp.AccountID
	if targetAccountID == "" && len(s.config.WhatsApp) > 0 {
		targetAccountID = s.config.WhatsApp[0].ID
	}

	// Format phone number to JID format
	formattedJID := utils.FormatPhoneToJID(resp.To, s.config.Server.DefaultCountryCode)

	// Parse JID
	jid, err := types.ParseJID(formattedJID)
	if err != nil {
		logging.Error("Invalid JID in hook response", "jid", formattedJID, "error", err)
		return
	}

	// Send message with context
	if err := s.whatsappMgr.SendTextMessage(ctx, targetAccountID, jid, resp.Text); err != nil {
		logging.Error("Failed to send message from hook response", "error", err)
	} else {
		logging.Info("Message sent from hook response", "account_id", targetAccountID, "to", resp.To)
	}
}