package server

import (
	"context"
	"errors"
	"fmt"
	"net/http"
	"os"
	"os/signal"
	"strings"
	"time"

	"github.com/a-h/templ"
	"github.com/labstack/echo/v4"
	"github.com/labstack/echo/v4/middleware"
	"gorm.io/gorm"

	"github.com/rjNemo/rentease/constants"
	"github.com/rjNemo/rentease/internal/domains/booking"
)

type Server struct {
	Router *echo.Echo
	db     *gorm.DB
	bs     *booking.Service
	addr   string
}

func New(db *gorm.DB) *Server {
	return &Server{
		Router: echo.New(),
		db:     db,
		bs:     booking.NewService(db),
		addr:   fmt.Sprintf("0.0.0.0:%s", os.Getenv("PORT")),
	}
}

func (s Server) MountHandlers() {
	// config
	s.Router.HideBanner = true
	s.Router.Debug = strings.ToLower(os.Getenv("DEBUG")) == "true"
	s.Router.Use(middleware.LoggerWithConfig(middleware.LoggerConfig{
		Format: "${time_rfc3339} [${method}: ${status}] ${uri}; ip=${remote_ip}; ${latency_human}; ${user_agent}\n",
	}))
	s.Router.HTTPErrorHandler = s.customHTTPErrorHandler
	// middlewares
	s.Router.Use(middleware.Recover())
	s.Router.Use(middleware.Secure())
	// static assets
	s.Router.Static("/static", "assets")
	// landing page
	s.Router.GET("/", s.handleHomePage())
	s.Router.GET(constants.RouteNewBooking, s.handleNewBookingPage())
	s.Router.POST(constants.RouteNewBooking, s.handleCreateBooking())
	s.Router.GET(fmt.Sprintf("%s/:id", constants.RouteBooking), s.handleBookingPage())
	s.Router.POST(fmt.Sprintf("%s/:id/items", constants.RouteBooking), s.handleCreateItem())
}

func (s Server) Start() {
	go func() {
		if err := s.Router.Start(s.addr); err != nil && !errors.Is(err, http.ErrServerClosed) {
			s.Router.Logger.Fatal("shutting down the server")
		}
	}()

	quit := make(chan os.Signal, 1)
	signal.Notify(quit, os.Interrupt)
	<-quit
	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer cancel()
	if err := s.Router.Shutdown(ctx); err != nil {
		s.Router.Logger.Fatal(err)
	}
}

func (s Server) renderTempl(c echo.Context, status int, t templ.Component) error {
	c.Response().Writer.WriteHeader(status)

	err := t.Render(context.Background(), c.Response().Writer)
	if err != nil {
		return c.String(http.StatusInternalServerError, "failed to render response template")
	}

	return nil
}

func (s Server) customHTTPErrorHandler(err error, c echo.Context) {
	code := http.StatusInternalServerError
	var he *echo.HTTPError
	if errors.As(err, &he) {
		code = he.Code
	}
	s.Router.Logger.Error(err)

	errorPage := fmt.Sprintf("assets/html/HTTP%d.html", code)
	if err := c.File(errorPage); err != nil {
		c.Logger().Error(err)
	}
}