package main

import (
	"fmt"
	"io/fs"
	"os"
	"path/filepath"
	"strings"

	"fyne.io/fyne/v2"
	"fyne.io/fyne/v2/app"
	"fyne.io/fyne/v2/container"
	"fyne.io/fyne/v2/dialog"
	"fyne.io/fyne/v2/theme"
	"fyne.io/fyne/v2/widget"
	"gopkg.in/yaml.v3"

	cp "github.com/otiai10/copy"
)

type Config struct {
	ProfilesRoot string `yaml:"profiles_root"`
	ArchiveRoot  string `yaml:"archive_root"`
}

func saveConfig(cfg Config) {
	d, err := yaml.Marshal(cfg)
	if err != nil {
		fmt.Println(err)
	}

	err = os.WriteFile("config.yaml", d, 0775)
	if err != nil {
		fmt.Println(err)
	}
}

func loadConfig() *Config {
	_, err := os.Stat("config.yaml")
	if err != nil {
		fmt.Println(err)
		saveConfig(Config{ProfilesRoot: "", ArchiveRoot: ""})
	}

	d, err := os.ReadFile("config.yaml")
	if err != nil {
		fmt.Println(err)
	}

	cfg := Config{}
	err = yaml.Unmarshal(d, &cfg)
	if err != nil {
		fmt.Println(err)
		return &Config{}
	}

	return &cfg
}

var cfg = loadConfig()

func main() {
	ap := app.New()
	wp := ap.NewWindow("Cyberpunk Mod Switcher")
	wp.Resize(fyne.NewSize(1024, 768))
	wp.CenterOnScreen()

	grid := container.NewVBox()
	scroll := container.NewVScroll(grid)
	scroll.SetMinSize(fyne.NewSize(-1, 768))

	//load grid
	fillGrid(grid, wp)

	profilesrootentry := widget.NewEntry()
	profilesrootentry.SetText(cfg.ProfilesRoot)
	profilesrootentry.Disable()

	archiverootentry := widget.NewEntry()
	archiverootentry.SetText(cfg.ArchiveRoot)
	archiverootentry.Disable()

	container := container.NewVBox(
		widget.NewForm(widget.NewFormItem("Profiles Directory", profilesrootentry)),
		widget.NewButtonWithIcon("Select", theme.FolderIcon(), func() {
			dialog.NewFolderOpen(func(lu fyne.ListableURI, err error) {
				if err != nil {
					fmt.Println(err)
				}
				if lu == nil {
					return
				}
				profilesrootentry.SetText(lu.Path())
				cfg.ProfilesRoot = lu.Path()
				saveConfig(*cfg)
				fillGrid(grid, wp)
			}, wp).Show()
		}),
		widget.NewForm(widget.NewFormItem("Archive Directory", archiverootentry)),
		widget.NewButtonWithIcon("Select", theme.FolderIcon(), func() {
			dialog.NewFolderOpen(func(lu fyne.ListableURI, err error) {
				if err != nil {
					fmt.Println(err)
				}
				if lu == nil {
					return
				}
				archiverootentry.SetText(lu.Path())
				cfg.ArchiveRoot = lu.Path()
				saveConfig(*cfg)
				fillGrid(grid, wp)
			}, wp).Show()
		}),
		widget.NewSeparator(),
		widget.NewButton("Reload Profiles", func() {
			fillGrid(grid, wp)
		}),
		scroll,
	)
	wp.SetContent(container)
	wp.ShowAndRun()
}

func fillGrid(grid *fyne.Container, parent fyne.Window) {
	profiles := scanProfiles(cfg.ProfilesRoot)
	archive := cfg.ArchiveRoot
	grid.Hide()
	defer grid.Show()
	grid.RemoveAll()
	for _, profile := range profiles {
		profilename := strings.TrimSuffix(filepath.Base(profile), ".cpms")
		grid.Add(widget.NewButton(profilename, makeIFunc(profile, archive, parent)))
	}
}

func scanProfiles(profilesroot string) []string {
	dir := filepath.Join(profilesroot, "*.cpms/")
	m, err := filepath.Glob(dir)
	if err != nil {
		fmt.Println(err)
	}

	return m
}

func makeIFunc(profile, archive string, parent fyne.Window) func() {
	return func() {
		if cfg.ArchiveRoot == "" || cfg.ProfilesRoot == "" {
			d := dialog.NewInformation("Notice", "you must select a archive root and profiles root before", parent)
			d.Show()

			return
		}

		dialog.NewConfirm("Are You Sure?", fmt.Sprintf("the current contents of %s will be lost", archive), func(b bool) {
			if b {
				err := walk(archive, func(path string, info fs.FileInfo, err error) error {
					if err != nil {
						return err
					}
					err = os.Remove(path)
					if err != nil {
						fmt.Println(err)
					}
					return nil
				})
				if err != nil {
					fmt.Println(err)
				}

				err = cp.Copy(profile, archive)
				if err != nil {
					fmt.Println(err)
				}

				dialog.NewInformation("Success", fmt.Sprintf("copied all files from %s to %s", filepath.Base(profile), archive), parent).Show()
			}
		}, parent).Show()
	}
}

func walk(root string, fn filepath.WalkFunc) error {
	initial := false

	return filepath.Walk(root, func(path string, info fs.FileInfo, err error) error {
		if !initial {
			initial = true
			return nil
		}

		return fn(path, info, err)
	})
}