package main

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

	"github.com/labstack/echo/v4"
	"github.com/labstack/echo/v4/middleware"
	"github.com/spf13/cobra"
	"github.com/spf13/viper"
)

var (
	apiPort int
	apiKey  string
)

// apiCmd represents the api command
var apiCmd = &cobra.Command{
	Use:   "api",
	Short: "Démarrer le serveur API",
	Args:  cobra.ExactArgs(0),
	Run: func(cmd *cobra.Command, args []string) {
		apiKey = viper.GetString(ViperAPIKey)
		apiPort = viper.GetInt(ViperAPIPort)

		e := echo.New()

		// Middlewares

		e.Pre(middleware.AddTrailingSlash())

		if apiKey != "" {
			e.Use(middleware.KeyAuth(func(key string, c echo.Context) (bool, error) {
				return subtle.ConstantTimeCompare([]byte(key), []byte(apiKey)) == 1, nil
			}))
		}

		// DataClient
		/*
			client, err := data.NewDataClientFromViper()
			if err != nil {
				log.Fatalf("Could not establish database connection.\n	Error: %s\n", err)
			}
			defer client.DB.Close()

			err = client.DB.Ping()
			if err != nil {
				log.Fatalf("Database was supposed to be ready but Ping() failed.\n  Error: %s\n", err)
			}

			_, err = client.Seed()
			if err != nil {
				log.Fatalf("Error during client.Seed(): %s", err)
			}
		*/

		// Routes
		/*
			h := handlers.New(client)

			e.GET("/v7/health/", h.GetHealth)

			e.POST("/v7/membres/", h.PostMembres)

			e.GET("/v7/membres/", h.ListMembres)

			e.GET("/v7/membres/:membre_id/", h.ReadMembre)

			e.PUT("/v7/membres/:membre_id/prefered_name/", h.PutMembrePreferedName)

			e.POST("/v7/programmes/", h.PostProgrammes)

			e.POST("/v7/seed/", h.PostSeed)
		*/

		// Execution

		e.Logger.Fatal(e.Start(fmt.Sprintf(":%d", apiPort)))
	},
}

func init() {
	rootCmd.AddCommand(apiCmd)

	// api.key
	apiCmd.Flags().String(FlagAPIKey, DefaultAPIKey, DescriptionAPIKey)
	if err := viper.BindPFlag(ViperAPIKey, apiCmd.Flags().Lookup(FlagAPIKey)); err != nil {
		log.Fatal(err)
	}

	// api.port
	apiCmd.Flags().Int(FlagAPIPort, DefaultAPIPort, DescriptionAPIPort)
	if err := viper.BindPFlag(ViperAPIPort, apiCmd.Flags().Lookup(FlagAPIPort)); err != nil {
		log.Fatal(err)
	}

	// db.database
	apiCmd.Flags().String(FlagDBDatabase, DefaultDBDatabase, DescriptionDBDatabase)
	if err := viper.BindPFlag(ViperDBDatabase, apiCmd.Flags().Lookup(FlagDBDatabase)); err != nil {
		log.Fatal(err)
	}

	// db.sslmode
	apiCmd.Flags().String(FlagDBSSLMode, DefaultDBSSLMode, DescriptionDBSSLMode)
	if err := viper.BindPFlag(ViperDBSSLMode, apiCmd.Flags().Lookup(FlagDBSSLMode)); err != nil {
		log.Fatal(err)
	}

	// db.host
	apiCmd.Flags().String(FlagDBHost, DefaultDBHost, DescriptionDBHost)
	if err := viper.BindPFlag(ViperDBHost, apiCmd.Flags().Lookup(FlagDBHost)); err != nil {
		log.Fatal(err)
	}

	// db.password
	apiCmd.Flags().String(FlagDBPassword, DefaultDBPassword, DescriptionDBPassword)
	if err := viper.BindPFlag(ViperDBPassword, apiCmd.Flags().Lookup(FlagDBPassword)); err != nil {
		log.Fatal(err)
	}

	// db.port
	apiCmd.Flags().Int(FlagDBPort, DefaultDBPort, DescriptionDBPort)
	if err := viper.BindPFlag(ViperDBPort, apiCmd.Flags().Lookup(FlagDBPort)); err != nil {
		log.Fatal(err)
	}

	// db.user
	apiCmd.Flags().String(FlagDBUser, DefaultDBUser, DescriptionDBUser)
	if err := viper.BindPFlag(ViperDBUser, apiCmd.Flags().Lookup(FlagDBUser)); err != nil {
		log.Fatal(err)
	}
}

var cfgFile string

// rootCmd represents the base command when called without any subcommands
var rootCmd = &cobra.Command{
	Use:   "bottin",
	Short: "Bottin étudiant de l'AGECEM",
}

// Execute adds all child commands to the root command and sets flags appropriately.
// This is called by main.main(). It only needs to happen once to the rootCmd.
func Execute() {
	err := rootCmd.Execute()
	if err != nil {
		os.Exit(1)
	}
}

func init() {
	cobra.OnInitialize(initConfig)

	rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.bottin.yaml)")
}

// initConfig reads in config file and ENV variables if set.
func initConfig() {
	if cfgFile != "" {
		// Use config file from the flag.
		viper.SetConfigFile(cfgFile)
	} else {
		// Find home directory.
		home, err := os.UserHomeDir()
		cobra.CheckErr(err)

		// Search config in home directory with name ".bottin" (without extension).
		viper.AddConfigPath(home)
		viper.SetConfigType("yaml")
		viper.SetConfigName(".bottin")
	}

	viper.SetEnvPrefix("BOTTIN")
	viper.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
	viper.AutomaticEnv() // read in environment variables that match

	// If a config file is found, read it in.
	if err := viper.ReadInConfig(); err == nil {
		fmt.Fprintln(os.Stderr, "Using config file:", viper.ConfigFileUsed())
	}
}

var (
	webUser        string
	webPassword    string
	webPort        int
	webApiHost     string
	webApiKey      string
	webApiPort     int
	webApiProtocol string
)

//go:embed templates/*
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) {
		webApiHost = viper.GetString(ViperWebAPIHost)
		webApiKey = viper.GetString(ViperWebAPIKey)
		webApiPort = viper.GetInt(ViperWebAPIPort)
		webApiProtocol = viper.GetString(ViperWebAPIProtocol)
		webPassword = viper.GetString(ViperWebPassword)
		webPort = viper.GetInt(ViperWebPort)
		webUser = viper.GetString(ViperWebUser)

		// Ping API server
		/*
			client := http.DefaultClient
			defer client.CloseIdleConnections()

			apiClient := data.NewApiClient(client, webApiKey, webApiHost, webApiProtocol, webApiPort)

			pingResult, err := apiClient.GetHealth()
			if err != nil {
				log.Fatal(err)
			}

			log.Println(pingResult)
		*/

		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(webUser)) == 1
			passwordsMatch := subtle.ConstantTimeCompare([]byte(password), []byte(webPassword)) == 1
			return usersMatch && passwordsMatch, nil
		}))

		// Template

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

		e.Renderer = t

		// Routes
		/*
			handler := webhandlers.Handler{APIClient: apiClient}

			e.GET("/", handler.GetIndex)
			e.GET("/membre/", handler.GetMembre)
		*/

		// Execution

		e.Logger.Fatal(e.Start(
			fmt.Sprintf(":%d", webPort)))
	},
}

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

	// web.api.host
	webCmd.Flags().String(FlagWebAPIHost, DefaultWebAPIHost, DescriptionWebAPIHost)
	if err := viper.BindPFlag(ViperWebAPIHost, webCmd.Flags().Lookup(FlagWebAPIHost)); err != nil {
		log.Fatal(err)
	}

	// web.api.key
	webCmd.Flags().String(FlagWebAPIKey, DefaultWebAPIKey, DescriptionWebAPIKey)
	if err := viper.BindPFlag(ViperWebAPIKey, webCmd.Flags().Lookup(FlagWebAPIKey)); err != nil {
		log.Fatal(err)
	}

	// web.api.protocol
	webCmd.Flags().String(FlagWebAPIProtocol, DefaultWebAPIProtocol, DescriptionWebAPIProtocol)
	if err := viper.BindPFlag(ViperWebAPIProtocol, webCmd.Flags().Lookup(FlagWebAPIProtocol)); err != nil {
		log.Fatal(err)
	}

	// web.api.port
	webCmd.Flags().Int(FlagWebAPIPort, DefaultWebAPIPort, DescriptionWebAPIPort)
	if err := viper.BindPFlag(ViperWebAPIPort, webCmd.Flags().Lookup(FlagWebAPIPort)); err != nil {
		log.Fatal(err)
	}

	// web.password
	webCmd.Flags().String(FlagWebPassword, DefaultWebPassword, DescriptionWebPassword)
	if err := viper.BindPFlag(ViperWebPassword, webCmd.Flags().Lookup(FlagWebPassword)); err != nil {
		log.Fatal(err)
	}

	// web.port
	webCmd.Flags().Int(FlagWebPort, DefaultWebPort, DescriptionWebPort)
	if err := viper.BindPFlag(ViperWebPort, webCmd.Flags().Lookup(FlagWebPort)); err != nil {
		log.Fatal(err)
	}

	// web.user
	webCmd.Flags().String(FlagWebUser, DefaultWebUser, DescriptionWebUser)
	if err := viper.BindPFlag(ViperWebUser, webCmd.Flags().Lookup(FlagWebUser)); err != nil {
		log.Fatal(err)
	}
}