package kernel

import (
	"bufio"
	"errors"
	"fyne.io/fyne/v2"
	"fyne.io/fyne/v2/canvas"
	"fyne.io/fyne/v2/container"
	"fyne.io/fyne/v2/theme"
	"fyne.io/fyne/v2/widget"
	"github.com/nicksnyder/go-i18n/v2/i18n"
	"image/color"
	"io"
	"regexp"
	"strconv"
	"strings"
)

type BlockProgressbarContract interface {
	GetContainer() *fyne.Container
	GetProgressbar(totalDuration float64, filePath string, localizerService LocalizerContract) Progress
	ProcessEndedWithError(errorText string)
	ProcessEndedWithSuccess(filePath string)
}

type BlockProgressbar struct {
	container     *fyne.Container
	label         *widget.Label
	progressbar   *widget.ProgressBar
	errorBlock    *container.Scroll
	messageError  *canvas.Text
	statusMessage *canvas.Text
	buttonPlay    *widget.Button
	statusesText  *BlockProgressbarStatusesText
	ffplayService FFplayContract
}

func NewBlockProgressbar(statusesText *BlockProgressbarStatusesText, ffplayService FFplayContract) *BlockProgressbar {
	label := widget.NewLabel("")
	progressbar := widget.NewProgressBar()

	statusMessage := canvas.NewText("", theme.Color(theme.ColorNamePrimary))
	messageError := canvas.NewText("", theme.Color(theme.ColorNameError))
	buttonPlay := widget.NewButtonWithIcon("", theme.Icon(theme.IconNameMediaPlay), func() {

	})
	buttonPlay.Hide()

	errorBlock := container.NewHScroll(messageError)
	errorBlock.Hide()

	content := container.NewVBox(
		container.NewHScroll(label),
		progressbar,
		container.NewHScroll(container.NewHBox(
			buttonPlay,
			statusMessage,
		)),
		errorBlock,
	)
	content.Hide()

	return &BlockProgressbar{
		container:     content,
		label:         label,
		progressbar:   progressbar,
		errorBlock:    errorBlock,
		messageError:  messageError,
		statusMessage: statusMessage,
		buttonPlay:    buttonPlay,
		statusesText:  statusesText,
		ffplayService: ffplayService,
	}
}

func (block BlockProgressbar) GetContainer() *fyne.Container {
	return block.container
}

func (block BlockProgressbar) GetProgressbar(totalDuration float64, filePath string, localizerService LocalizerContract) Progress {
	block.label.Text = filePath
	block.statusMessage.Color = theme.Color(theme.ColorNamePrimary)
	block.statusMessage.Text = block.statusesText.inProgress
	block.messageError.Text = ""
	fyne.Do(func() {
		block.buttonPlay.Hide()
		if block.errorBlock.Visible() {
			block.errorBlock.Hide()
		}
		block.statusMessage.Refresh()
		block.container.Refresh()
		block.errorBlock.Refresh()
	})

	block.progressbar.Value = 0
	return NewProgress(totalDuration, block.progressbar, localizerService)
}

func (block BlockProgressbar) ProcessEndedWithError(errorText string) {
	fyne.Do(func() {
		block.statusMessage.Color = theme.Color(theme.ColorNameError)
		block.statusMessage.Text = block.statusesText.error
		block.messageError.Text = errorText
		block.errorBlock.Show()
	})
}

func (block BlockProgressbar) ProcessEndedWithSuccess(filePath string) {
	fyne.Do(func() {
		block.statusMessage.Color = color.RGBA{R: 49, G: 127, B: 114, A: 255}
		block.statusMessage.Text = block.statusesText.completed
		block.buttonPlay.Show()
		block.buttonPlay.OnTapped = func() {
			block.buttonPlay.Disable()
			go func() {
				_ = block.ffplayService.Run(FFplaySetting{
					PathToFile: filePath,
				})
				fyne.Do(func() {
					block.buttonPlay.Enable()
				})
			}()
		}
	})
}

type Progress struct {
	totalDuration    float64
	progressbar      *widget.ProgressBar
	protocol         string
	localizerService LocalizerContract
}

func NewProgress(totalDuration float64, progressbar *widget.ProgressBar, localizerService LocalizerContract) Progress {
	return Progress{
		totalDuration:    totalDuration,
		progressbar:      progressbar,
		protocol:         "pipe:",
		localizerService: localizerService,
	}
}

func (p Progress) GetProtocole() string {
	return p.protocol
}

func (p Progress) Run(stdOut io.ReadCloser, stdErr io.ReadCloser) error {
	isProcessCompleted := false
	var errorText string

	p.progressbar.Value = 0
	p.progressbar.Max = p.totalDuration
	fyne.Do(func() {
		p.progressbar.Refresh()
	})
	progress := 0.0

	go func() {
		scannerErr := bufio.NewReader(stdErr)
		for {
			line, _, err := scannerErr.ReadLine()
			if err != nil {
				if err == io.EOF {
					break
				}
				continue
			}
			data := strings.TrimSpace(string(line))
			errorText = data
		}
	}()

	scannerOut := bufio.NewReader(stdOut)
	for {
		line, _, err := scannerOut.ReadLine()
		if err != nil {
			if err == io.EOF {
				break
			}
			continue
		}
		data := strings.TrimSpace(string(line))
		if strings.Contains(data, "progress=end") {
			p.progressbar.Value = p.totalDuration
			fyne.Do(func() {
				p.progressbar.Refresh()
			})
			isProcessCompleted = true
			break
		}

		re := regexp.MustCompile(`frame=(\d+)`)
		a := re.FindAllStringSubmatch(data, -1)

		if len(a) > 0 && len(a[len(a)-1]) > 0 {
			c, err := strconv.Atoi(a[len(a)-1][len(a[len(a)-1])-1])
			if err != nil {
				continue
			}
			progress = float64(c)
		}
		if p.progressbar.Value != progress {
			p.progressbar.Value = progress
			fyne.Do(func() {
				p.progressbar.Refresh()
			})
		}
	}

	if isProcessCompleted == false {
		if len(errorText) == 0 {
			errorText = p.localizerService.GetMessage(&i18n.LocalizeConfig{
				MessageID: "errorConverter",
			})
		}
		return errors.New(errorText)
	}

	return nil
}

type BlockProgressbarStatusesText struct {
	inProgress string
	completed  string
	error      string
}

func GetBlockProgressbarStatusesText(localizerService LocalizerContract) *BlockProgressbarStatusesText {
	statusesText := &BlockProgressbarStatusesText{
		inProgress: localizerService.GetMessage(&i18n.LocalizeConfig{
			MessageID: "inProgressQueue",
		}),
		completed: localizerService.GetMessage(&i18n.LocalizeConfig{
			MessageID: "completedQueue",
		}),
		error: localizerService.GetMessage(&i18n.LocalizeConfig{
			MessageID: "errorQueue",
		}),
	}

	localizerService.AddChangeCallback("inProgressQueue", func(text string) {
		statusesText.inProgress = text
	})

	localizerService.AddChangeCallback("completedQueue", func(text string) {
		statusesText.completed = text
	})

	localizerService.AddChangeCallback("errorQueue", func(text string) {
		statusesText.error = text
	})

	return statusesText
}