// URTrator - Urban Terror server browser and game launcher, written in
// Go.
//
// Copyright (c) 2016-2020, Stanslav N. a.k.a pztrn (or p0z1tr0n) and
// URTrator contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject
// to the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
// OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

package launcher

import (
	// stdlib
	"errors"
	"fmt"
	"os"
	"os/exec"
	"path/filepath"
	"runtime"
	"strconv"
	"strings"

	// local
	"go.dev.pztrn.name/urtrator/datamodels"

	// Github
	"github.com/mattn/go-gtk/gtk"
)

type Launcher struct {
	// Flags.
	// Is Urban Terror launched ATM?
	launched bool
}

func (l *Launcher) CheckForLaunchedUrbanTerror() error {
	if l.launched {
		// Temporary disable all these modals on Linux.
		// See https://github.com/mattn/go-gtk/issues/289.
		if runtime.GOOS != "linux" {
			mbox_string := "Game is launched.\n\nCannot quit, because game is launched.\nQuit Urban Terror to exit URTrator!"
			m := gtk.NewMessageDialog(nil, gtk.DIALOG_MODAL, gtk.MESSAGE_ERROR, gtk.BUTTONS_OK, mbox_string)
			m.Response(func() {
				m.Destroy()
			})
			m.Run()
			return errors.New("User didn't select valid profile, mismatch with server's version.")
		}
	}

	return nil
}

func (l *Launcher) findFreeDisplay() string {
	current_display_raw := os.Getenv("DISPLAY")
	current_display, _ := strconv.Atoi(strings.Split(current_display_raw, ":")[1])
	current_display += 1
	return strconv.Itoa(current_display)
}

func (l *Launcher) Initialize() {
	fmt.Println("Initializing game launcher...")
}

func (l *Launcher) Launch(server_profile *datamodels.Server, user_profile *datamodels.Profile, password string, additional_parameters []string, callback func()) {
	// ToDo: only one instance of Urban Terror should be launched, so button
	// should be disabled.
	fmt.Println("Launching Urban Terror...")

	done := make(chan bool, 1)

	// Create launch string.
	var launch_bin string = ""
	launch_bin, err := exec.LookPath(user_profile.Binary)
	if err != nil {
		fmt.Println(err.Error())
	}

	server_address := server_profile.Ip + ":" + server_profile.Port

	var launch_params []string
	if len(server_address) > 0 {
		launch_params = append(launch_params, "+connect", server_address)
	}
	if len(password) > 0 {
		launch_params = append(launch_params, "+password", password)
	}
	if len(user_profile.Additional_params) > 0 {
		additional_params := strings.Split(user_profile.Additional_params, " ")
		launch_params = append(launch_params, additional_params...)
	}
	if len(additional_parameters) > 0 {
		for i := range additional_parameters {
			launch_params = append(launch_params, additional_parameters[i])
		}
	}
	if runtime.GOOS == "linux" && user_profile.Second_x_session == "1" {
		launch_params = append([]string{launch_bin}, launch_params...)
		display := l.findFreeDisplay()
		launch_bin, err = exec.LookPath("xinit")
		if err != nil {
			fmt.Println(err.Error())
		}
		launch_params = append(launch_params, "--", ":"+display)
	}
	if runtime.GOOS == "darwin" {
		// On macOS we should not start binary, but application bundle.
		// So we will obtain app bundle path.
		bundle_path := strings.Split(launch_bin, "/Contents")[0]
		// and create special launch string, which involves open.
		launch_bin = "/usr/bin/open"
		launch_params = append([]string{launch_bin, "-W", "-a", bundle_path, "--args"}, launch_params...)
	}
	fmt.Println(launch_bin, launch_params)
	go func() {
		go func() {
			cmd := exec.Command(launch_bin, launch_params...)
			// This workaround is required on Windows, otherwise ioq3
			// will not find game data.
			if runtime.GOOS == "windows" {
				dir := filepath.Dir(launch_bin)
				cmd.Dir = dir
			}
			out, err1 := cmd.Output()
			if err1 != nil {
				fmt.Println("Launch error: " + err1.Error())
			}
			fmt.Println(string(out))
			done <- true
		}()

		select {
		case <-done:
			callback()
		}
	}()
}