package main

import (
	ui "github.com/VladimirMarkelov/clui"
	term "github.com/nsf/termbox-go"
)

const (
	LoginOk = iota
	LoginCanceled
	LoginInvalid
)

type LoginDialog struct {
	View     *ui.Window
	Username string
	Password string
	Action   int

	result      int
	beforeClose func()
	onClose     func()
	onCheck     func(string, string) bool
}

func CreateLoginDialog(title string) *LoginDialog {
	dlg := new(LoginDialog)

	sWidth, sHeight := ui.ScreenSize()
	wWidth, wHeight := 40, 15
	dlg.View = ui.AddWindow(sWidth/2-wWidth/2, sHeight/2-wHeight/2, wWidth, wHeight, title)
	ui.WindowManager().BeginUpdate()
	defer ui.WindowManager().EndUpdate()

	dlg.View.SetModal(true)
	dlg.View.SetSizable(false)
	dlg.View.SetTitleButtons(ui.ButtonDefault)
	dlg.View.SetPack(ui.Vertical)

	userfrm := ui.CreateFrame(dlg.View, 1, 1, ui.BorderNone, ui.Fixed)
	userfrm.SetPaddings(1, 1)
	userfrm.SetPack(ui.Horizontal)
	userfrm.SetGaps(1, 0)
	ui.CreateLabel(userfrm, ui.AutoSize, ui.AutoSize, "   Login", ui.Fixed)
	edUser := ui.CreateEditField(userfrm, 20, "", 1)

	passfrm := ui.CreateFrame(dlg.View, 1, 1, ui.BorderNone, 1)
	passfrm.SetPaddings(1, 1)
	passfrm.SetPack(ui.Horizontal)
	passfrm.SetGaps(1, 0)
	ui.CreateLabel(passfrm, ui.AutoSize, ui.AutoSize, "Password", ui.Fixed)
	edPass := ui.CreateEditField(passfrm, 20, "", 1)
	edPass.SetPasswordMode(true)

	filler := ui.CreateFrame(dlg.View, 1, 1, ui.BorderNone, 1)
	filler.SetPack(ui.Horizontal)
	lbRes := ui.CreateLabel(filler, ui.AutoSize, ui.AutoSize, "", 1)

	blist := ui.CreateFrame(dlg.View, 1, 1, ui.BorderNone, ui.Fixed)
	blist.SetPack(ui.Horizontal)
	blist.SetPaddings(1, 1)
	btnOk := ui.CreateButton(blist, 20, 4, "Authenticate me", 1)

	btnOk.OnClick(func(ev ui.Event) {
		if dlg.onCheck != nil && !dlg.onCheck(edUser.Title(), edPass.Title()) {
			lbRes.SetTitle("Invalid username or password")
			dlg.Action = LoginInvalid
			return
		}

		dlg.Action = LoginOk
		if dlg.onCheck == nil {
			dlg.Username = edUser.Title()
			dlg.Password = edPass.Title()
		}

		if dlg.beforeClose != nil {
			dlg.beforeClose()
		}
		ui.WindowManager().DestroyWindow(dlg.View)
		ui.WindowManager().BeginUpdate()

		closeFunc := dlg.onClose
		ui.WindowManager().EndUpdate()
		if closeFunc != nil {
			closeFunc()
		}
	})

	dlg.View.OnKeyDown(func(ev ui.Event, data interface{}) bool {
		if ev.Key == term.KeyEnter {
			if edUser.Title() == "" {
				ui.ActivateControl(dlg.View, edUser)
			} else if edPass.Title() == "" {
				ui.ActivateControl(dlg.View, edPass)
			} else {
				if dlg.beforeClose != nil {
					dlg.beforeClose()
				}
				ui.WindowManager().DestroyWindow(dlg.View)
				ui.WindowManager().BeginUpdate()

				closeFunc := dlg.onClose
				ui.WindowManager().EndUpdate()
				if closeFunc != nil {
					closeFunc()
				}
			}
			return true
		}
		return false
	}, nil)

	edUser.OnChange(func(ev ui.Event) {
		lbRes.SetTitle("")
	})
	edPass.OnChange(func(ev ui.Event) {
		lbRes.SetTitle("")
	})

	ui.ActivateControl(dlg.View, edUser)

	return dlg
}