package help

import (
	"fmt"

	"git.brettb.xyz/goinv/client/internal/ui/style"
	"git.brettb.xyz/goinv/client/internal/ui/utils"
	"github.com/gdamore/tcell/v2"
	"github.com/rivo/tview"
)

type Help struct {
	*tview.Box
	title  string
	layout *tview.Flex
}

func NewHelp(appName string, appVersion string) *Help {
	help := &Help{
		Box:   tview.NewBox(),
		title: "help",
	}

	headerColor := style.HelpHeaderFgColor
	fgColor := style.FgColor
	bgColor := style.BgColor
	borderColor := style.BorderColor

	keyinfo := tview.NewTable()
	keyinfo.SetBackgroundColor(bgColor)
	keyinfo.SetFixed(1, 1)
	keyinfo.SetSelectable(false, false)

	appinfo := tview.NewTextView().
		SetDynamicColors(true).
		SetWrap(true).
		SetTextAlign(tview.AlignLeft)
	appinfo.SetBackgroundColor(bgColor)

	appInfoText := fmt.Sprintf("%s %s - (C) 2024 Brett Bender", appName, appVersion)
	appinfo.SetText(appInfoText)
	appinfo.SetTextColor(headerColor)

	rowIndex := 0
	colIndex := 0
	needInit := true
	maxRowIndex := len(utils.UIKeyBindings) / 2

	for i := 0; i < len(utils.UIKeyBindings); i++ {
		if i >= maxRowIndex {
			if needInit {
				colIndex = 2
				rowIndex = 0
				needInit = false
			}
		}

		keyinfo.SetCell(rowIndex, colIndex,
			tview.NewTableCell(fmt.Sprintf("%s:", utils.UIKeyBindings[i].Label())).
				SetAlign(tview.AlignRight).
				SetBackgroundColor(bgColor).
				SetSelectable(true).SetTextColor(headerColor))

		keyinfo.SetCell(rowIndex, colIndex+1,
			tview.NewTableCell(utils.UIKeyBindings[i].Description()).
				SetAlign(tview.AlignLeft).
				SetBackgroundColor(bgColor).
				SetSelectable(true).
				SetTextColor(fgColor))

		rowIndex++
	}

	mlayout := tview.NewFlex().SetDirection(tview.FlexRow)
	mlayout.AddItem(appinfo, 1, 0, false)
	mlayout.AddItem(utils.EmptyBoxSpace(bgColor), 1, 0, false)
	mlayout.AddItem(keyinfo, 0, 1, false)
	mlayout.AddItem(utils.EmptyBoxSpace(bgColor), 1, 0, false)

	help.layout = tview.NewFlex().SetDirection(tview.FlexColumn)
	help.layout.AddItem(utils.EmptyBoxSpace(bgColor), 1, 0, false)
	help.layout.AddItem(mlayout, 0, 1, false)
	help.layout.AddItem(utils.EmptyBoxSpace(bgColor), 1, 0, false)
	help.layout.SetBorder(true)
	help.layout.SetBackgroundColor(bgColor)
	help.layout.SetBorderColor(borderColor)

	return help
}

func (help *Help) GetTitle() string {
	return help.title
}

func (help *Help) HasFocus() bool {
	return utils.CheckFocus(help.Box, help.layout)
}

func (help *Help) Focus(delegate func(tview.Primitive)) {
	delegate(help.layout)
}

func (help *Help) Draw(screen tcell.Screen) {
	x, y, width, height := help.Box.GetInnerRect()
	if height <= 3 {
		return
	}

	help.Box.DrawForSubclass(screen, help)
	help.layout.SetRect(x, y, width, height)
	help.layout.Draw(screen)
}