// go get github.com/rivo/tview@master
package tui

import (
	"errors"
	"fmt"
	"strings"

	node "git.zzyxyz.com/zzy/goncdu/node"
	"git.zzyxyz.com/zzy/goncdu/utils"
	"github.com/gdamore/tcell/v2"
	"github.com/rivo/tview"
)

type UI struct {
	app       *tview.Application
	main      *tview.Frame
	msg       string
	err       string
	list      *tview.List
	node      *node.NodeManager
	nodes     []*node.PathNode
	inputPath *tview.InputField
}

func NewUI(n *node.NodeManager) *UI {
	list := tview.NewList()
	list.ShowSecondaryText(false).
		SetTitleAlign(tview.AlignLeft).
		SetTitleColor(tcell.ColorWhite)
	frame := tview.NewFrame(list).
		SetBorders(0, 0, 0, 0, 1, 1)

	ui := &UI{
		app:  tview.NewApplication().SetRoot(frame, true),
		main: frame,
		msg:  "",
		err:  "",
		list: list,
		node: n,
	}

	ui.list.SetInputCapture(
		func(event *tcell.EventKey) *tcell.EventKey {
			switch event.Key() {
			case tcell.KeyRight:
				idx := ui.list.GetCurrentItem()
				if len(ui.nodes) == 0 {
					ui.err = errors.New("no children nodes").Error()
					break
				}
				name := ui.nodes[idx].GetPath()
				if err := ui.node.GoIn(name); err != nil {
					ui.err = err.Error()
					break
				}
			case tcell.KeyLeft:
				if err := ui.node.GoOut(); err != nil {
					ui.err = err.Error()
				}
			case tcell.KeyRune:
				switch event.Rune() {
				case 'q':
					ui.app.Stop()
				case '?':
					// show help
					ui.showHelp()
				case 'R':
					ui.app.SetRoot(ui.inputPath, true)
				case 'S':
					if err := ui.node.SaveToFile(); err != nil {
						ui.err = err.Error()
					}
				case 'L':
					if err := ui.node.LoadFromFile(); err != nil {
						ui.err = err.Error()
					}
				default:
					return event
				}
			default:
				return event
			}

			// END:
			ui.renderList()
			return nil
		})
	return ui
}

func (ui *UI) showHelp() {
	helpText := []string{
		"goncdu Help",
		"-------------------------",
		"Use the arrow keys to navigate:",
		"  ↑ (up)    : Move up",
		"  ↓ (down)  : Move down",
		"  → (right) : Enter directory",
		"  ← (left)  : Go up one directory",
		"-------------------------",
		"Other commands:",
		"  R         : ReInput scan path",
		"  f         : Refresh cache",
		"  q         : Quit",
		"  ?         : Show this help message",
		"-------------------------",
		"Press q, Enter, Esc key to return",
	}

	// 调整字符串长度使其一致
	maxLength := 0
	for _, line := range helpText {
		if len(line) > maxLength {
			maxLength = len(line)
		}
	}

	var helpContent strings.Builder
	for _, line := range helpText {
		paddedLine := fmt.Sprintf("%-*s", maxLength, line)
		helpContent.WriteString(paddedLine)
		helpContent.WriteString("\n")
	}

	// 创建一个模态窗口并添加 TextView
	modal := tview.NewModal().
		SetText(helpContent.String())

	modal.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
		if event.Key() == tcell.KeyEscape || event.Key() == tcell.KeyEnter ||
			(event.Key() == tcell.KeyRune && event.Rune() == 'q') {
			ui.app.SetRoot(ui.main, true)
		}
		return event
	})

	// 设置模态窗口为应用的根节点
	ui.app.SetRoot(modal, false)
}
func (ui *UI) drawHeaderFooter() {
	curNode := ui.node.GetCurrentNode()
	ui.main.Clear().
		AddText("goncdu test ~ Use the arrow keys to navigate, press ? for help",
			true, tview.AlignLeft, tcell.ColorWhite).
		AddText(fmt.Sprintf("--- %s", curNode.GetPath()),
			true, tview.AlignLeft, tcell.ColorWhite).
		AddText(fmt.Sprintf("Total Size = %s Items = %d --- Scaning time = %s",
			node.FormatSize(curNode.GetSize()), curNode.GetCount()-1, ui.node.GetScanTime()),
			false, tview.AlignLeft, tcell.ColorWhite).
		AddText(ui.err, false, tview.AlignLeft, tcell.ColorGrey)
}

func (ui *UI) drawList(items []string) {
	ui.list.Clear()
	for _, item := range items {
		ui.list.AddItem(item, "", 0, nil)
	}
}

func (ui *UI) run() {
	if err := ui.app.Run(); err != nil {
		panic(err)
	}
}

func (ui *UI) renderList() {
	icon_type := map[node.PathNodeType]string{
		node.DIR:     "📁",
		node.FILE:    "📄",
		node.UNKNOWN: "❓",
	}

	nodes := ui.node.GetChildrenWithSorted()
	ui.nodes = nodes

	renderLine := func(entry *node.PathNode) string {
		return fmt.Sprintf("%s %10s %10s %s\n", icon_type[entry.GetType()],
			node.FormatSize(entry.GetSize()),
			utils.FormatProgressBar(entry.GetSize(), nodes[0].GetSize(), 10,
				[]string{" ", "▏", "▎", "▍", "▌", "▋", "▊", "▉", "█"}),
			entry.GetPath())
	}

	str_list := make([]string, len(nodes))
	for idx, child := range nodes {
		ret := renderLine(child)
		str_list[idx] = ret
	}
	ui.drawList(str_list)
	ui.drawHeaderFooter()
}

func (ui *UI) scanPath() {
	err := ui.node.Scan()
	if err != nil {
		ui.err = err.Error()
	}
	ui.renderList()
}

func ShowMain(entry *node.NodeManager) {
	ui := NewUI(entry)

	// need input path
	inputPath := tview.NewInputField()
	ui.inputPath = inputPath
	inputPath.SetLabel("Input Path: ").
		SetFieldWidth(4096).
		SetDoneFunc(func(key tcell.Key) {
			if key == tcell.KeyEnter {
				path := inputPath.GetText()
				valid := ui.node.SetRootPath(path)
				if valid {
					ui.app.SetRoot(ui.main, true)
					ui.scanPath()
				} else {
					inputPath.SetLabel("Invalid Path")
				}
			}
		})

	if entry.VaildRoot() {
		ui.app.SetRoot(ui.main, true)
		ui.scanPath()
	} else {
		ui.app.SetRoot(inputPath, true)
	}
	ui.run()
}