// Copyright (C) 2020  Raziman

package main

import (
	"fmt"
	"regexp"
	"strings"
	"time"

	"github.com/gdamore/tcell"
	"github.com/rivo/tview"
	"github.com/sahilm/fuzzy"
	"github.com/spf13/viper"
)

// this is used to make the popup unique
// this mitigates the issue of closing all popups when timeout ends
var (
	popupCounter = 0
)

// Simple stack data structure
type Stack struct {
	popups []tview.Primitive
}

// Push popup to the stack and focus
func (s *Stack) push(p tview.Primitive) {
	s.popups = append(s.popups, p)
	gomu.app.SetFocus(p)
}

// Show item on the top of the stack
func (s *Stack) peekTop() tview.Primitive {

	if len(s.popups)-1 < 0 {
		return nil
	}

	return s.popups[len(s.popups)-1]
}

// Remove popup from the stack and focus previous popup
func (s *Stack) pop() tview.Primitive {

	if len(s.popups) == 0 {
		return nil
	}

	last := s.popups[len(s.popups)-1]
	res := s.popups[:len(s.popups)-1]
	s.popups = res

	// focus previous popup
	if len(s.popups) > 0 {
		gomu.app.SetFocus(s.popups[len(s.popups)-1])
	} else {
		// focus the panel if no popup left
		gomu.app.SetFocus(gomu.prevPanel.(tview.Primitive))
	}

	return last
}

// Gets popup timeout from config file
func getPopupTimeout() time.Duration {

	dur := viper.GetString("general.popup_timeout")
	m, err := time.ParseDuration(dur)

	if err != nil {
		logError(err)
		return time.Second * 5
	}

	return m
}

// Simple confirmation popup. Accepts callback
func confirmationPopup(
	text string,
	handler func(buttonIndex int, buttonLabel string),
) {

	modal := tview.NewModal().
		SetText(text).
		SetBackgroundColor(gomu.popupBg).
		AddButtons([]string{"no", "yes"}).
		SetButtonBackgroundColor(gomu.popupBg).
		SetButtonTextColor(gomu.accentColor).
		SetDoneFunc(func(indx int, label string) {
			handler(indx, label)
			gomu.pages.RemovePage("confirmation-popup")
			gomu.popups.pop()
		})

	gomu.pages.
		AddPage("confirmation-popup", center(modal, 40, 10), true, true)

	gomu.popups.push(modal)

}

func center(p tview.Primitive, width, height int) tview.Primitive {
	return tview.NewFlex().
		AddItem(nil, 0, 1, false).
		AddItem(tview.NewFlex().SetDirection(tview.FlexRow).
			AddItem(nil, 0, 1, false).
			AddItem(p, height, 1, false).
			AddItem(nil, 0, 1, false), width, 1, false).
		AddItem(nil, 0, 1, false)
}

func topRight(p tview.Primitive, width, height int) tview.Primitive {
	return tview.NewFlex().
		AddItem(nil, 0, 23, false).
		AddItem(tview.NewFlex().SetDirection(tview.FlexRow).
			AddItem(nil, 0, 1, false).
			AddItem(p, height, 1, false).
			AddItem(nil, 0, 15, false), width, 1, false).
		AddItem(nil, 0, 1, false)
}

// Width and height parameter are optional, provide 0 for both to use deault values.
// It defaults to 70 and 7 respectively.
func timedPopup(
	title string, desc string, timeout time.Duration, width, height int,
) {

	// Wait until app is not suspended
	for {
		if !gomu.isSuspend {
			break
		}
	}

	if width == 0 && height == 0 {
		width = 70
		height = 7
	}

	textView := tview.NewTextView().
		SetText(desc).
		SetTextColor(gomu.accentColor)

	textView.SetTextAlign(tview.AlignCenter).SetBackgroundColor(gomu.popupBg)

	box := tview.NewFrame(textView).SetBorders(1, 0, 0, 0, 0, 0)
	box.SetTitle(title).SetBorder(true).SetBackgroundColor(gomu.popupBg)
	popupId := fmt.Sprintf("%s %d", "timeout-popup", popupCounter)

	popupCounter++
	gomu.pages.AddPage(popupId, topRight(box, width, height), true, true)
	gomu.app.SetFocus(gomu.prevPanel.(tview.Primitive))

	go func() {
		time.Sleep(timeout)
		gomu.pages.RemovePage(popupId)
		gomu.app.Draw()

		// timed popup shouldn't get focused
		// this here check if another popup exists and focus that instead of panel
		// if none continue focus panel
		topPopup := gomu.popups.peekTop()
		if topPopup == nil {
			gomu.app.SetFocus(gomu.prevPanel.(tview.Primitive))
		} else {
			gomu.app.SetFocus(topPopup)
		}
	}()
}

// Shows popup for the current volume
func volumePopup(volume float64) {

	currVol := volToHuman(volume)
	maxVol := 100
	// max progress bar length
	maxLength := 50

	progressBar := progresStr(currVol, maxVol, maxLength, "█", "-")

	progress := fmt.Sprintf("\n%d |%s| %d",
		currVol,
		progressBar,
		maxVol,
	)

	timedPopup(" Volume ", progress, getPopupTimeout(), 0, 0)
}

// Shows a list of keybind. The upper list is the local keybindings to specific
// panel only. The lower list is the global keybindings
func helpPopup(panel Panel) {

	helpText := panel.help()

	genHelp := []string{
		" ",
		"tab    change panel",
		"space  toggle play/pause",
		"esc    close popup",
		"n      skip",
		"q      quit",
		"+      volume up",
		"-      volume down",
		"?      toggle help",
	}

	list := tview.NewList().ShowSecondaryText(false)
	list.SetBackgroundColor(gomu.popupBg).SetTitle(" Help ").
		SetBorder(true)
	list.SetSelectedBackgroundColor(gomu.popupBg).
		SetSelectedTextColor(gomu.accentColor)

	for _, v := range append(helpText, genHelp...) {
		list.AddItem(v, "", 0, nil)
	}

	prev := func() {
		currIndex := list.GetCurrentItem()
		list.SetCurrentItem(currIndex - 1)
	}

	next := func() {
		currIndex := list.GetCurrentItem()
		idx := currIndex + 1
		if currIndex == list.GetItemCount()-1 {
			idx = 0
		}
		list.SetCurrentItem(idx)
	}

	list.SetInputCapture(func(e *tcell.EventKey) *tcell.EventKey {

		switch e.Rune() {
		case 'j':
			next()
		case 'k':
			prev()
		}

		switch e.Key() {
		case tcell.KeyEsc:
			gomu.pages.RemovePage("help-page")
			gomu.popups.pop()
		}

		return nil
	})

	gomu.pages.AddPage("help-page", center(list, 50, 30), true, true)
	gomu.popups.push(list)
}

// Input popup. Takes video url from youtube to be downloaded
func downloadMusicPopup(selPlaylist *tview.TreeNode) {

	re := regexp.MustCompile(`^((?:https?:)?\/\/)?((?:www|m)\.)?((?:youtube\.com|youtu.be))(\/(?:[\w\-]+\?v=|embed\/|v\/)?)([\w\-]+)(\S+)?$`)

	inputField := tview.NewInputField().
		SetLabel("Youtube url: ").
		SetFieldWidth(0).
		SetAcceptanceFunc(tview.InputFieldMaxLength(50)).
		SetFieldBackgroundColor(gomu.accentColor).
		SetFieldTextColor(tcell.ColorBlack)

	inputField.SetBackgroundColor(gomu.popupBg).
		SetBorder(true).SetTitle(" Ytdl ")

	inputField.SetDoneFunc(func(key tcell.Key) {

		switch key {
		case tcell.KeyEnter:
			url := inputField.GetText()

			// check if valid youtube url was given
			if re.MatchString(url) {
				go func() {
					if err := ytdl(url, selPlaylist); err != nil {
						logError(err)
					}
				}()
			} else {
				timedPopup("Invalid url", "Invalid youtube url was given",
					getPopupTimeout(), 0, 0)
			}

			gomu.pages.RemovePage("download-input-popup")
			gomu.popups.pop()

		case tcell.KeyEscape:
			gomu.pages.RemovePage("download-input-popup")
			gomu.popups.pop()
		}

		gomu.app.SetFocus(gomu.prevPanel.(tview.Primitive))

	})

	gomu.pages.
		AddPage("download-input-popup", center(inputField, 50, 4), true, true)

	gomu.popups.push(inputField)

}

// Input popup that takes the name of directory to be created
func createPlaylistPopup() {

	inputField := tview.NewInputField().
		SetLabel("Enter a playlist name: ").
		SetFieldWidth(0).
		SetAcceptanceFunc(tview.InputFieldMaxLength(50)).
		SetFieldBackgroundColor(gomu.accentColor).
		SetFieldTextColor(tcell.ColorBlack)

	inputField.
		SetBackgroundColor(gomu.popupBg).
		SetBorder(true).
		SetTitle(" New Playlist ")

	inputField.SetDoneFunc(func(key tcell.Key) {

		switch key {
		case tcell.KeyEnter:
			playListName := inputField.GetText()
			err := gomu.playlist.createPlaylist(playListName)

			if err != nil {
				logError(err)
			}

			gomu.pages.RemovePage("mkdir-input-popup")
			gomu.popups.pop()

		case tcell.KeyEsc:
			gomu.pages.RemovePage("mkdir-input-popup")
			gomu.popups.pop()
		}

	})

	gomu.pages.
		AddPage("mkdir-input-popup", center(inputField, 50, 4), true, true)

	gomu.popups.push(inputField)

}

func exitConfirmation(args Args) {

	confirmationPopup("Are you sure to exit?", func(_ int, label string) {

		if label == "no" || label == "" {
			return
		}

		err := gomu.quit(args)
		if err != nil {
			logError(err)
		}
	})
}

func searchPopup(stringsToMatch []string, handler func(selected string)) {

	list := tview.NewList().ShowSecondaryText(false)
	list.SetSelectedBackgroundColor(gomu.accentColor)
	list.SetHighlightFullLine(true)

	for _, v := range stringsToMatch {
		list.AddItem(v, v, 0, nil)
	}

	input := tview.NewInputField()
	input.SetFieldBackgroundColor(gomu.bgColor).
		SetLabel("[red]>[-] ")
	input.SetChangedFunc(func(text string) {

		list.Clear()

		// list all item if input is empty
		if len(text) == 0 {
			for _, v := range stringsToMatch {
				list.AddItem(v, v, 0, nil)
			}
			return
		}

		pattern := input.GetText()
		matches := fuzzy.Find(pattern, stringsToMatch)
		const highlight = "[red]%s[-]"

		for _, match := range matches {
			var text strings.Builder
			for i := 0; i < len(match.Str); i++ {
				currChar := string(match.Str[i])
				if contains(i, match.MatchedIndexes) {
					text.WriteString(fmt.Sprintf(highlight, currChar))
				} else {
					text.WriteString(currChar)
				}
			}
			list.AddItem(text.String(), match.Str, 0, nil)
		}
	})

	input.SetInputCapture(func(e *tcell.EventKey) *tcell.EventKey {

		switch e.Key() {
		case tcell.KeyCtrlN:
			currIndx := list.GetCurrentItem()
			// if last index
			if currIndx == list.GetItemCount()-1 {
				currIndx = 0
			} else {
				currIndx++
			}
			list.SetCurrentItem(currIndx)

		case tcell.KeyCtrlP:
			currIndx := list.GetCurrentItem()

			if currIndx == 0 {
				currIndx = list.GetItemCount() - 1
			} else {
				currIndx--
			}
			list.SetCurrentItem(currIndx)

		case tcell.KeyEnter:
			if list.GetItemCount() > 0 {
				_, selected := list.GetItemText(list.GetCurrentItem())
				handler(selected)
				gomu.pages.RemovePage("search-input-popup")
				gomu.popups.pop()
			}

		case tcell.KeyEscape:
			gomu.pages.RemovePage("search-input-popup")
			gomu.popups.pop()
		}

		return e
	})

	popup := tview.NewFlex().SetDirection(tview.FlexRow).
		AddItem(input, 2, 1, true).
		AddItem(list, 0, 1, false)

	popup.SetBorder(true).
		SetBackgroundColor(gomu.popupBg).
		SetBorderPadding(1, 1, 2, 2).
		SetTitle(" Find In Playlist ")

	gomu.pages.AddPage("search-input-popup", center(popup, 70, 40), true, true)
	gomu.popups.push(popup)
}