package main

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

	"github.com/go-chi/chi/v5"
	"github.com/go-chi/chi/v5/middleware"
	"github.com/go-chi/cors"
	"github.com/swaggo/http-swagger/v2"

	_ "git.kundeng.us/phoenix/textsender-api/docs"
	"git.kundeng.us/phoenix/textsender-api/internal/app"
	"git.kundeng.us/phoenix/textsender-api/internal/config"
	database "git.kundeng.us/phoenix/textsender-api/internal/db"
	"git.kundeng.us/phoenix/textsender-api/internal/handler"
	"git.kundeng.us/phoenix/textsender-api/internal/handler/endpoint"
	mdlware "git.kundeng.us/phoenix/textsender-api/internal/middleware"
	"git.kundeng.us/phoenix/textsender-api/internal/services"
	"git.kundeng.us/phoenix/textsender-api/internal/store"
)

// @title           textsender-api
// @version         1.0
// @description     Core API to send text messages

// @host      localhost:8080
// @BasePath  /api/v1

// @securityDefinitions.apikey  BearerAuth
// @in                          header
// @name                        Authorization
// @description                 JWT Bearer Token
func main() {
	cfg, tCfg, err := config.Load()
	if err != nil {
		log.Fatal("Error:", err)
	} else if cfg == nil {
		log.Fatal("Error initializing config")
	} else if cfg.JWTSecret == "" {
		log.Fatal("Error: JWTSecret not initialized")
	}

	apiApp := app.App{TwilioConfig: tCfg}

	db, err := database.NewDatabase(cfg.GetDBConnString())
	if err != nil {
		log.Fatal("Failed to connect to database:", err)
	}
	defer db.Close()

	ctx := context.Background()

	if cfg.ResetDB {
		log.Println("Resetting database")
		if err := db.ResetDatabase(ctx); err != nil {
			log.Fatal("Failed to reset database:", err)
		}
		log.Println("Database reset completed. Exiting.")
		return
	} else {
		if exists, err := database.TableExists(ctx, db.Pool, "contacts"); err == nil && !exists {
			log.Println("Resetting database")
			if err = db.ResetDatabase(ctx); err != nil {
				log.Fatal("Error:", err)
			}
		} else {
			log.Fatal("Error:", err)
		}
	}

	jwtService := services.NewJWTService(cfg.JWTSecret)

	contactStore := store.NewContactStore(db.Pool)
	messageStore := store.NewMessageStore(db.Pool)
	schStore := store.NewScheduledMessageStore(db.Pool)
	schMsgEventStore := store.NewScheduledMessageEventStore(db.Pool)
	merStore := store.NewMessageEventResponseStore(db.Pool)

	contactHandler := handler.NewContactHandler(&apiApp, contactStore)
	messageHandler := handler.NewMessageHandler(&apiApp, messageStore)
	scheduledMessageHandler := handler.NewScheduledMessageHandler(&apiApp, schStore)
	scheduledMessageEventHandler := handler.NewScheduledMessageEventHandler(&apiApp, schMsgEventStore, schStore)
	scheduledMessageStatusHandler := handler.NewScheduledMessageStatusHandler(&apiApp, schMsgEventStore, schStore)
	eventHandler := handler.NewEventResponseHandler(&apiApp, merStore)
	instantMessageHandler := handler.NewSendInstantMessageHandler(&apiApp, merStore, contactStore, messageStore)

	router := chi.NewRouter()

	// Configure CORS
	router.Use(cors.Handler(cors.Options{
		AllowedOrigins:   cfg.AllowedOrigins,
		AllowedMethods:   []string{"GET", "POST", "PUT", "DELETE", "OPTIONS", "PATCH"},
		AllowedHeaders:   []string{"Accept", "Authorization", "Content-Type", "X-CSRF-Token"},
		ExposedHeaders:   []string{"Link", "X-Total-Count"},
		AllowCredentials: true,
		MaxAge:           300, // 5 minutes
	}))
	router.Use(middleware.Logger)
	router.Use(middleware.Recoverer)
	router.Use(middleware.Timeout(60 * time.Second))
	router.Use(mdlware.JSONContentType)

	router.Method("POST", endpoint.ADD_CONTACT_ENDPOINT, mdlware.AuthMiddleware(jwtService)(http.HandlerFunc(contactHandler.AddContact)))
	router.Method("GET", endpoint.GET_CONTACT, mdlware.AuthMiddleware(jwtService)(http.HandlerFunc(contactHandler.GetContact)))
	router.Method("POST", endpoint.ADD_MESSAGE, mdlware.AuthMiddleware(jwtService)(http.HandlerFunc(messageHandler.AddMessage)))
	router.Method("GET", endpoint.GET_MESSAGE, mdlware.AuthMiddleware(jwtService)(http.HandlerFunc(messageHandler.GetMessage)))
	router.Method("POST", endpoint.ScheduleMessageEndpoint, mdlware.AuthMiddleware(jwtService)(http.HandlerFunc(scheduledMessageHandler.AddScheduledMessage)))
	router.Method("POST", endpoint.AddEventToScheduledMessageEndpoint, mdlware.AuthMiddleware(jwtService)(http.HandlerFunc(scheduledMessageEventHandler.AddScheduledMessageEvent)))
	router.Method("GET", endpoint.GetScheduledMessageEventEndpoint, mdlware.AuthMiddleware(jwtService)(http.HandlerFunc(scheduledMessageEventHandler.GetScheduledMessageEvent)))
	router.Method("DELETE", endpoint.DeleteScheduledMessageEventEndpoint, mdlware.AuthMiddleware(jwtService)(http.HandlerFunc(scheduledMessageEventHandler.DeleteScheduledMessageEvent)))
	router.Method("PATCH", endpoint.UpdateScheduledMessageStatusEndpoint, mdlware.AuthMiddleware(jwtService)(http.HandlerFunc(scheduledMessageStatusHandler.UpdateStatus)))
	router.Method("GET", endpoint.GetScheduledMessageEndpoint, mdlware.AuthMiddleware(jwtService)(http.HandlerFunc(scheduledMessageHandler.GetScheduledMessage)))
	router.Method("GET", endpoint.FetchNextScheduledMessageEndpoint, mdlware.AuthMiddleware(jwtService)(http.HandlerFunc(scheduledMessageHandler.FetchNextMessage)))
	router.Method("POST", endpoint.RecordEventResponse, mdlware.AuthMiddleware(jwtService)(http.HandlerFunc(eventHandler.RecordResponse)))
	router.Method("GET", endpoint.FetchMessageEventResponse, mdlware.AuthMiddleware(jwtService)(http.HandlerFunc(eventHandler.Fetch)))
	router.Method("POST", endpoint.SendInstantMessageEndpoint, mdlware.AuthMiddleware(jwtService)(http.HandlerFunc(instantMessageHandler.Send)))
	router.Method("PATCH", endpoint.Update_Names_Endpoint, mdlware.AuthMiddleware(jwtService)(http.HandlerFunc(contactHandler.UpdateName)))

	router.Method("GET", "/swagger/*", httpSwagger.Handler(
		httpSwagger.URL(fmt.Sprintf("http://localhost:%s/swagger/doc.json", config.PORT)),
	))

	// Start server
	server := &http.Server{
		Addr:         ":" + cfg.ServerPort,
		Handler:      router,
		ReadTimeout:  15 * time.Second,
		WriteTimeout: 15 * time.Second,
		IdleTimeout:  60 * time.Second,
	}

	// Graceful shutdown
	go func() {
		log.Printf("Server starting on port %s", cfg.ServerPort)
		if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			log.Fatalf("Server failed to start: %v", err)
		}
	}()

	// Wait for interrupt signal
	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(), 30*time.Second)
	defer cancel()

	if err := server.Shutdown(ctx); err != nil {
		log.Fatalf("Server forced to shutdown: %v", err)
	}

	log.Println("Server exited")
}