package main

import (
	"fmt"
	"os"
	"runtime"
	"sync"

	"fyne.io/fyne/v2"
	"fyne.io/fyne/v2/app"
	"fyne.io/fyne/v2/container"
	"fyne.io/fyne/v2/data/binding"
	"fyne.io/fyne/v2/dialog"
	"fyne.io/fyne/v2/theme"
	"fyne.io/fyne/v2/widget"
)

var supported = []string{"jpg", "jpeg", "png", "bmp", "webp"}

func main() {
	a := app.New()
	w := a.NewWindow("Photomator")
	a.SetIcon(resourceLogoPng)

	w.CenterOnScreen()
	w.SetIcon(resourceLogoPng)
	w.Resize(fyne.NewSize(600, 600))

	folderEntry := widget.NewEntry()
	folderEntry.SetPlaceHolder("Bilderordner")
	folderEntry.ActionItem = widget.NewButtonWithIcon("", theme.FolderOpenIcon(), func() {
		selectFolder("Bilderordner", a, folderEntry, w)
	})

	outputEntry := widget.NewEntry()
	outputEntry.SetPlaceHolder("Zielordner")
	outputEntry.ActionItem = widget.NewButtonWithIcon("", theme.FolderOpenIcon(), func() {
		selectFolder("Zielordner", a, outputEntry, w)
	})

	runButton := widget.NewButtonWithIcon("Ausführen", theme.MediaPlayIcon(), func() {
		images, err := os.ReadDir(folderEntry.Text)
		if checkError(err, w) {
			return
		}

		outputPath := outputEntry.Text
		_, err = os.Stat(outputPath)
		if err != nil {
			if checkError(os.Mkdir(outputPath, 0777), w) {
				return
			}
		}

		unconverted := binding.NewStringList()

		progress := binding.NewFloat()
		d := dialog.NewCustomWithoutButtons("Konvertierung läuft...", widget.NewProgressBarWithData(progress), w)
		d.Show()

		n := runtime.NumCPU()
		var wg sync.WaitGroup
		for i := 0; i < n; i++ {
			wg.Add(1)
			go convertRange(folderEntry.Text, outputPath, images, n, i, progress, unconverted, &wg)
		}

		wg.Wait()

		d.Hide()

		if unconverted.Length() == 0 {
			dialog.ShowInformation("Konvertierung abgeschlossen", "Alle Bilder wurden erfolgreich konvertiert", w)
		} else {
			label := widget.NewLabel("Folgende Dateien konnten nicht konvertiert werden:")
			list := widget.NewList(
				func() int {
					return unconverted.Length()
				},
				func() fyne.CanvasObject {
					return widget.NewLabel("template")
				},
				func(i widget.ListItemID, o fyne.CanvasObject) {
					item, _ := unconverted.GetValue(i)
					o.(*widget.Label).SetText(item)
				},
			)
			d := dialog.NewCustom("Konvertierung abgeschlossen", "Schließen", container.NewVBox(
				label,
				container.NewWithoutLayout(
					list,
				),
			), w)
			list.Resize(fyne.NewSize(label.MinSize().Width, 630))
			d.Resize(fyne.NewSize(d.MinSize().Width, 800))
			d.Show()
		}
	})

	w.SetContent(container.NewPadded(container.NewVBox(
		folderEntry,
		outputEntry,
		runButton,
		widget.NewSeparator(),
	)))

	w.ShowAndRun()
}

func selectFolder(title string, a fyne.App, i *widget.Entry, w fyne.Window) {
	fdw := a.NewWindow(fmt.Sprintf("%s wählen", title))
	fdw.CenterOnScreen()
	fdw.SetIcon(resourceLogoPng)
	fdw.Resize(fyne.NewSize(1600, 900))
	fd := dialog.NewFolderOpen(func(lu fyne.ListableURI, err error) {
		fdw.Close()
		if checkError(err, w) || lu == nil {
			return
		}
		i.SetText(lu.Path())
	}, fdw)
	fd.Resize(fyne.NewSize(1600, 900))
	fd.SetOnClosed(func() {})
	fd.SetConfirmText("Öffnen")
	fd.SetDismissText("Abbrechen")
	fdw.Show()
	fd.Show()
}

func checkError(err error, w fyne.Window) bool {
	if err != nil {
		dialog.ShowError(err, w)
		return true
	}

	return false
}