package main

import (
	"crm-go/internal/handlers"
	"crm-go/internal/middleware"
	"crm-go/internal/storage"
	"log"
	"net/http"
	"os"
	"path/filepath"
	"strings"
)

func main() {
	// Initialize storage
	customerStorage := storage.NewCustomerStorage("./data/customers.json")

	// Initialize handlers
	customerHandler := handlers.NewCustomerHandler(customerStorage)
	authHandler := handlers.NewAuthHandler()

	// Enable CORS manually
	corsHandler := func(h http.Handler) http.Handler {
		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			w.Header().Set("Access-Control-Allow-Origin", "*")
			w.Header().Set("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS")
			w.Header().Set("Access-Control-Allow-Headers", "Content-Type, Authorization")

			if r.Method == "OPTIONS" {
				w.WriteHeader(http.StatusOK)
				return
			}

			h.ServeHTTP(w, r)
		})
	}

	// Auth routes
	http.HandleFunc("/api/login", authHandler.Login)

	// Set up routes using standard http
	http.HandleFunc("/api/customers", func(w http.ResponseWriter, r *http.Request) {
		switch r.Method {
		case "GET":
			customerHandler.GetCustomers(w, r)
		case "POST":
			customerHandler.CreateCustomer(w, r)
		default:
			http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		}
	})

	http.HandleFunc("/api/customers/", func(w http.ResponseWriter, r *http.Request) {
		path := r.URL.Path

		// Handle import endpoint
		if path == "/api/customers/import" {
			if r.Method == "POST" {
				customerHandler.ImportCustomers(w, r)
				return
			}
		}

		// Handle customer ID endpoints
		if strings.HasPrefix(path, "/api/customers/") && path != "/api/customers/" {
			// Extract customer ID from URL
			id := strings.TrimPrefix(path, "/api/customers/")

			// Remove query parameters if any
			if idx := strings.Index(id, "?"); idx != -1 {
				id = id[:idx]
			}

			if id != "" {
				if r.Method == "GET" {
					customerHandler.GetCustomerByID(w, r)
					return
				}
				if r.Method == "PUT" {
					customerHandler.UpdateCustomer(w, r)
					return
				}
				if r.Method == "DELETE" {
					customerHandler.DeleteCustomer(w, r)
					return
				}
			}
		}

		http.NotFound(w, r)
	})

	// Serve static files for the frontend
	staticDir := "./frontend"
	if _, err := os.Stat(staticDir); os.IsNotExist(err) {
		// Create basic frontend directory if it doesn't exist
		os.MkdirAll(staticDir, 0755)
	}

	// Serve static files
	http.Handle("/static/", http.StripPrefix("/static/", http.FileServer(http.Dir("./frontend"))))

	// Serve index page
	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		http.ServeFile(w, r, filepath.Join("./frontend", "index.html"))
	})

	// Assemble final handler chain: DefaultServeMux -> AuthMiddleware -> CorsHandler
	finalHandler := middleware.AuthMiddleware(http.DefaultServeMux)

	log.Println("Server starting on :8081")
	log.Fatal(http.ListenAndServe(":8081", corsHandler(finalHandler)))
}