package cmd

import (
	"crypto/subtle"
	"embed"
	"fmt"
	"html/template"
	"io"
	"log"

	"git.agecem.com/agecem/bottin-agenda/data"
	"git.agecem.com/agecem/bottin-agenda/models"
	"git.agecem.com/agecem/bottin-agenda/web"
	"git.agecem.com/agecem/bottin-agenda/web/webhandlers"
	"github.com/labstack/echo/v4"
	"github.com/labstack/echo/v4/middleware"
	"github.com/spf13/cobra"
	"github.com/spf13/viper"
)

var templatesFS embed.FS

type Template struct {
	templates *template.Template
}

func (t *Template) Render(w io.Writer, name string, data interface{}, c echo.Context) error {
	return t.templates.ExecuteTemplate(w, name, data)
}

// webCmd represents the web command
var webCmd = &cobra.Command{
	Use:   "web",
	Short: "Démarrer le client web",
	Args:  cobra.ExactArgs(0),
	Run: func(cmd *cobra.Command, args []string) {
		var config models.Config

		err := viper.Unmarshal(&config)
		if err != nil {
			log.Fatalf("Error during webCmd#viper.Unmarshal(): %s", err)
		}

		// Ping API server

		apiClient := data.NewApiClient(config.Web.Api.Key, config.Web.Api.Host, config.Web.Api.Protocol, config.Web.Api.Port)

		healthResult, err := apiClient.GetHealth()
		if err != nil {
			log.Fatalf("Error during webCmd#apiClient.GetHealth(): %s", err)
		}

		log.Println(healthResult)

		e := echo.New()

		// Middlewares

		e.Pre(middleware.AddTrailingSlash())

		e.Use(middleware.BasicAuth(func(user, password string, c echo.Context) (bool, error) {
			usersMatch := subtle.ConstantTimeCompare([]byte(user), []byte(config.Web.User)) == 1
			passwordsMatch := subtle.ConstantTimeCompare([]byte(password), []byte(config.Web.Password)) == 1
			return usersMatch && passwordsMatch, nil
		}))

		// Template

		t := &Template{
			templates: template.Must(template.ParseFS(templatesFS, "templates/*.html")),
		}

		e.Renderer = t

		// Routes

		e.GET("/", webhandlers.GetIndex)
		e.POST("/transaction/", webhandlers.PostTransaction)

		// Execution

		e.Logger.Fatal(e.Start(
			fmt.Sprintf(":%d", config.Web.Port)))
	},
}

func init() {
	rootCmd.AddCommand(webCmd)
	templatesFS = web.GetTemplates()
}