package server

import (
	"context"
	"embed"
	"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"

	"github.com/rjNemo/rentease/config"
	"github.com/rjNemo/rentease/internal/booking"
	"github.com/rjNemo/rentease/internal/pdf"
)

type Server struct {
	Router *echo.Echo
	bs     *booking.Service
	ps     *pdf.PdfService
	hc     *config.Host
	fs     *embed.FS
	addr   string
}

func New(fs *embed.FS, bs *booking.Service, ps *pdf.PdfService, hc *config.Host) *Server {
	s := &Server{
		Router: NewRouter(*fs),
		bs:     bs,
		ps:     ps,
		hc:     hc,
		addr:   fmt.Sprintf("0.0.0.0:%s", os.Getenv("PORT")),
	}
	s.MountHandlers()
	return s
}

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

	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 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 NewRouter(fs embed.FS) *echo.Echo {
	e := echo.New()
	// config
	e.HideBanner = true
	e.Debug = strings.ToLower(os.Getenv("DEBUG")) == "true"
	e.Use(middleware.LoggerWithConfig(middleware.LoggerConfig{
		Format: "${time_rfc3339} [${method}: ${status}] ${uri}; ip=${remote_ip}; ${latency_human}; ${user_agent}\n",
	}))
	e.HTTPErrorHandler = customHTTPErrorHandler(e)
	// middlewares
	e.Use(middleware.Recover())
	e.Use(middleware.Secure())
	// static assets
	e.StaticFS("/static", echo.MustSubFS(fs, "assets"))

	return e
}

func customHTTPErrorHandler(e *echo.Echo) echo.HTTPErrorHandler {
	return func(err error, c echo.Context) {
		code := http.StatusInternalServerError
		var he *echo.HTTPError
		if errors.As(err, &he) {
			code = he.Code
		}

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