package cmd

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

	"github.com/spf13/cobra"

	"git.metaunix.net/BitGoblin/mcst/util"
)

var (
	serverName string
	minecraftVersion string
)

var newCmd = &cobra.Command{
  Use:   "new",
  Short: "Create a new Minecraft server instance.",
  Long:  `Create a new Minecraft server instance.`,
  Run: func(cmd *cobra.Command, args []string) {
		log.Printf("Creating new server with name '%s', and version '%s'\n", serverName, minecraftVersion)

		serverDirectoryPath := util.ResolveTilde(fmt.Sprintf("~/%s", serverName))

		err := os.Mkdir(serverDirectoryPath, 0755)
		if err != nil && !os.IsExist(err) {
			log.Fatal(err)
		}

		var serverJarURL string = "https://piston-data.mojang.com/v1/objects/f69c284232d7c7580bd89a5a4931c3581eae1378/server.jar"
		var serverFilePath string = fmt.Sprintf("%s/server_%s.jar", serverDirectoryPath, minecraftVersion)

		log.Printf("Downloading %s to %s\n", serverJarURL, serverFilePath)
		file, err := os.Create(serverFilePath)
    if err != nil {
        log.Fatal(err)
    }

    client := http.Client{
			CheckRedirect: func(r *http.Request, via []*http.Request) error {
				r.URL.Opaque = r.URL.Path
				return nil
			},
    }

    // Put content on file
    resp, err := client.Get(serverJarURL)
    if err != nil {
        log.Fatal(err)
    }
    defer resp.Body.Close()

    _, err = io.Copy(file, resp.Body)
    defer file.Close()

		// create the shell script to start the server
		log.Printf("Creating start.sh shell script.\n")
		var scriptFilePath string = fmt.Sprintf("%s/start.sh", serverDirectoryPath)
		scriptFile, err := os.Create(scriptFilePath)
		if err != nil {
			log.Fatalf("Unable to open file: %v", err)
		}
		defer scriptFile.Close()

		// add text to the file
		_, err = scriptFile.WriteString(fmt.Sprintf("#!/bin/sh\n\ncd %s\njava -Xmx2048M -Xms2048M -jar server_%s.jar nogui", serverDirectoryPath, minecraftVersion))
		if err != nil {
			log.Fatalf("Unable to write data: %v", err)
		}

		// set permissions on the script
		err = os.Chmod(scriptFilePath, 0755)
		if err != nil {
			log.Fatalf("Unable to change script permissions: %v", err)
		}
  },
}

func init() {
	// bind flags to variables
	newCmd.Flags().StringVarP(&serverName, "server-name", "n", "", "The name for your new server.")
	newCmd.MarkFlagRequired("server-name")
	newCmd.Flags().StringVarP(&minecraftVersion, "minecraft-version", "m", "", "Minecraft Java Edition server version to use.")
	newCmd.MarkFlagRequired("minecraft-version")

	// add this command to the command root
  rootCmd.AddCommand(newCmd)
}