package cmd

import (
	"fmt"
	"log"
	"net/http"
	"os"
	"strings"

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

// serverCmd represents the server command
var serverCmd = &cobra.Command{
	Use:   "server",
	Short: "Démarrer le serveur web",
	Run: func(cmd *cobra.Command, args []string) {
		runServer()
	},
}

func init() {
	rootCmd.AddCommand(serverCmd)
	declareFlags()
}

func declareFlags() {
	serverCmd.Flags().IntP("port", "p", 8080, "Port réseau à utiliser (config: \"server.port\")")
	viper.BindPFlag("server.port", serverCmd.Flags().Lookup("port"))

	serverCmd.Flags().String("contenu_dir", "contenu", "Répertoire du contenu à exposer (config: \"server.contenu_dir\")")
	viper.BindPFlag("server.contenu_dir", serverCmd.Flags().Lookup("contenu_dir"))

	serverCmd.Flags().String("static_dir", "static", "Répertoire des fichiers statiques à exposer (config: \"server.static_dir\")")
	viper.BindPFlag("server.static_dir", serverCmd.Flags().Lookup("static_dir"))
}

func runServer() {
	log.Print("[I] Starting webserver")

	port := fmt.Sprintf(":%d", viper.GetInt("server.port"))
	static_dir := viper.GetString("server.static_dir")

	e := echo.New()

	g := e.Group("")

	e.Pre(middleware.RemoveTrailingSlash())

	g.Static("/", static_dir)

	g.GET("/api", showAPISpecs)
	g.GET("/api/contenu", showContenu)
	g.GET("/api/contenu/:filename", showFile)

	e.Logger.Fatal(e.Start(port))

}

func listContenu(path string) ([]string, error) {
	var files []string
	f, err_open := os.Open(path)
	defer f.Close()

	if err_open != nil {
		return nil, err_open
	}
	fileInfo, err_read := f.Readdir(-1)
	if err_read != nil {
		return nil, err_read
	}

	for _, file := range fileInfo {
		if file.Name() != ".gitkeep" && file.Name() != "messages.txt" {
			files = append(files, file.Name())
		}
	}
	return files, nil
}

// Handlers

func showAPISpecs(c echo.Context) error {
	apispec := `agecem/babillard
API Specifications
-----
'/'                       | GET | Affiche l'application 'slider'
'/api'                    | GET | Affiche les spécifications API
'/api/contenu'            | GET | Affiche le nom des fichiers dans 'contenu/'
'/api/contenu/{filename}' | GET | Affiche le fichier 'contenu/{filename}'
-----`

	return c.String(http.StatusOK, apispec)
}

func showContenu(c echo.Context) error {
	contenu_dir := viper.GetString("server.contenu_dir")
	files, err := listContenu(contenu_dir)

	if err != nil {
		log.Fatal(err)
	}

	return c.String(http.StatusOK, strings.Join(files, ";"))
}

func showFile(c echo.Context) error {
	filename := c.Param("filename")
	contenu_dir := viper.GetString("server.contenu_dir")

	if filename == ".gitkeep" {
		return c.String(http.StatusOK, "invalid file requested")
	}

	return c.File(fmt.Sprintf("%s/%s", contenu_dir, filename))
}