package list

import (
	"bufio"
	"fmt"
	"os"
	"regexp"
	"sort"
	"strconv"

	"github.com/nicksnyder/go-i18n/v2/i18n"
	"golang.org/x/term"
)

var regex = regexp.MustCompile("\033\\[[0-9;]+m")

func removeANSIEscapeCodes(input string) string {
	return regex.ReplaceAllString(input, "")
}

type ListData struct {
	pages       []ListPage
	history     []int
	currentPage int
	strLengths  []int
	localizer   *i18n.Localizer
}

type ListPage struct {
	Title  string
	Items  []ListItem
	Render func() []ListItem
	Cache  []ListItem
}

type ListItem struct {
	Label  string
	Notice string
	Order  int
	Render func() ListItem
	LinkTo int
	Value  interface{}
}

func New(localizer *i18n.Localizer) ListData {
	return ListData{
		pages:     []ListPage{},
		history:   []int{},
		localizer: localizer,
	}
}

func (l *ListData) Execute() interface{} {
	return l.listRunner()
}

func (l *ListData) AddPage(page ListPage) {
	l.pages = append(l.pages, page)
}

func (l *ListData) listRunner() interface{} {

	var option interface{}

	for {

		var tempItemStore []ListItem

		for _, item := range l.pages[l.currentPage].Items {

			if len(l.pages[l.currentPage].Cache) == 0 {
				if item.Render != nil {
					renderedItem := item.Render()
					renderedItem.Value = item.Value
					tempItemStore = append(tempItemStore, renderedItem)
				} else {
					tempItemStore = append(tempItemStore, item)
				}

				sort.SliceStable(tempItemStore, func(i, j int) bool {
					return tempItemStore[i].Order < tempItemStore[j].Order
				})
			}

		}

		if len(tempItemStore) != 0 {
			l.pages[l.currentPage].Cache = append(l.pages[l.currentPage].Cache, tempItemStore...)

			if l.currentPage != 0 {
				l.pages[l.currentPage].Cache = append(
					l.pages[l.currentPage].Cache,
					[]ListItem{
						{
							Label: "Back",
							Value: "action_back",
						},
					}...,
				)
			}

		}

		l.renderList()

		chosen := l.inputHandler(l.pages[l.currentPage].Cache)

		if chosen.LinkTo != 0 {

			width, _, _ := term.GetSize(0)

			var totalLineNum int

			if width == 0 {
				totalLineNum = len(l.strLengths)
			} else {
				for _, strLength := range l.strLengths {
					totalLineNum += ((strLength) / width)
				}
			}
			totalLineNum++ //User input line

			for i := 0; i < totalLineNum; i++ {
				fmt.Printf("\033[A\033[K\033[0G")
			}

			l.history = append(l.history, l.currentPage)
			l.currentPage = chosen.LinkTo

			continue

		}

		if chosen.Value != nil {

			if _, ok := chosen.Value.(string); ok {
				if chosen.Value == "action_home" {

					l.currentPage = 0
					l.history = []int{}

					width, _, _ := term.GetSize(0)

					var totalLineNum int

					if width == 0 {
						totalLineNum = len(l.strLengths)
					} else {
						for _, strLength := range l.strLengths {
							totalLineNum += ((strLength) / width)
						}
					}
					totalLineNum++ //User input line

					for i := 0; i < totalLineNum; i++ {
						fmt.Printf("\033[A\033[K\033[0G")
					}

					continue

				}

				if chosen.Value == "action_back" {

					l.currentPage = l.history[len(l.history)-1]

					if len(l.history) == 1 {
						l.history = []int{}
					} else {
						l.history = l.history[0 : len(l.history)-2]
					}

					width, _, _ := term.GetSize(0)

					var totalLineNum int

					if width == 0 {
						totalLineNum = len(l.strLengths)
					} else {
						for _, strLength := range l.strLengths {
							totalLineNum += ((strLength) / width)
						}
					}
					totalLineNum++ //User input line

					for i := 0; i < totalLineNum; i++ {
						fmt.Printf("\033[A\033[K\033[0G")
					}

					continue

				}
			}

			option = chosen.Value
			break

		}

	}

	return option

}

func (l *ListData) renderList() {

	l.strLengths = []int{}

	currentPage := l.pages[l.currentPage]

	listNotice := fmt.Sprintf("\033[1m\033[38;5;247m[\033[38;5;214m!\033[38;5;247m]\033[22m \033[3mPlease choose an option from 1 - %d\033[0m\n", len(currentPage.Cache))
	l.strLengths = append(l.strLengths, len(removeANSIEscapeCodes(listNotice)))
	fmt.Print(listNotice)

	listTitle := fmt.Sprintf("\033[1m\033[38;5;247m\033[4m%s:\033[0m\n", currentPage.Title)
	l.strLengths = append(l.strLengths, len(removeANSIEscapeCodes(listTitle)))
	fmt.Print(listTitle)

	longestStrLength := 0

	for _, item := range currentPage.Cache {
		formattedLabel := removeANSIEscapeCodes(item.Label)
		if len([]rune(formattedLabel)) > longestStrLength {
			longestStrLength = len([]rune(formattedLabel))
		}
	}

	for index, item := range currentPage.Cache {
		var listItem string

		var userInputColor string
		if index == len(currentPage.Cache)-1 {
			userInputColor = "\033[3m\033[38;5;214m"
		}

		if _, ok := item.Value.(string); ok {
			if item.Value == "action_back" {
				listItem = fmt.Sprintf("  \033[38;5;247m[\033[1m\033[38;5;167m%d\033[22m\033[38;5;247m]\033[0m %-*s \033[3m\033[38;5;247m%s\033[0m%s\n", index+1, longestStrLength, item.Label, item.Notice, userInputColor)
			} else {
				listItem = fmt.Sprintf("  \033[38;5;247m[\033[1m\033[38;5;214m%d\033[22m\033[38;5;247m]\033[0m %-*s \033[3m\033[38;5;247m%s\033[0m%s\n", index+1, longestStrLength, item.Label, item.Notice, userInputColor)
			}
		} else {
			listItem = fmt.Sprintf("  \033[38;5;247m[\033[1m\033[38;5;214m%d\033[22m\033[38;5;247m]\033[0m %-*s \033[3m\033[38;5;247m%s\033[0m%s\n", index+1, longestStrLength, item.Label, item.Notice, userInputColor)
		}

		l.strLengths = append(l.strLengths, len(removeANSIEscapeCodes(listItem)))
		fmt.Print(listItem)
	}

}

func (l *ListData) inputHandler(items []ListItem) ListItem {

	scanner := bufio.NewScanner(os.Stdin)
	scanner.Split(bufio.ScanLines)

	var input int

	for scanner.Scan() {

		text := scanner.Text()

		inputAnswer, err := strconv.Atoi(text)
		if err != nil {
			width, _, _ := term.GetSize(0)

			var totalLineNum int

			if width == 0 {
				totalLineNum = len(l.strLengths)
			} else {
				for _, strLength := range l.strLengths {
					totalLineNum += ((strLength) / width)
				}
			}
			totalLineNum++ //User input line

			for i := 0; i < totalLineNum; i++ {
				fmt.Printf("\033[0m\033[A\033[K\033[0G")
			}

			fmt.Printf("\033[1m\033[38;5;247m[\033[38;5;167m!\033[38;5;247m]\033[0m Invalid input, please try again!\n")
			l.strLengths = []int{}

			l.renderList()
			continue
		}

		if inputAnswer < 1 || inputAnswer > len(items) {
			width, _, _ := term.GetSize(0)

			var totalLineNum int

			if width == 0 {
				totalLineNum = len(l.strLengths)
			} else {
				for _, strLength := range l.strLengths {
					totalLineNum += ((strLength) / width)
				}
			}
			totalLineNum++ //User input line

			for i := 0; i < totalLineNum; i++ {
				fmt.Printf("\033[A\033[K\033[0G")
			}

			fmt.Printf("\033[1m\033[38;5;247m[\033[38;5;167m!\033[38;5;247m]\033[0m Invalid input, please try again!\n")
			l.strLengths = []int{}

			l.renderList()
			continue
		}

		input = inputAnswer

		break

	}

	chosenItem := items[input-1]

	return chosenItem
}