package main

import (
	"image/color"
	"log"

	"github.com/hajimehoshi/ebiten/v2"
	"github.com/hajimehoshi/ebiten/v2/inpututil"
	// "muhq.space/muhqs-game/go/game"
	"muhq.space/muhqs-game/go/ui"
)

const (
	START_BUTTON_WIDTH  = 150
	START_BUTTON_HEIGHT = 50
)

type StartMenu struct {
	app           *app
	width, height int

	playerName string
	startDeck  string
	remote     string
	mapPath    string
	widgets    []ui.Widget
}

func NewStartMenu(app *app) *StartMenu {
	m := &StartMenu{app: app}

	return m
}

func (m *StartMenu) build() {
	playerLabel := ui.NewCenteringFixedTextBox(
		(m.width-START_BUTTON_WIDTH)/2-START_BUTTON_WIDTH,
		(m.height-START_BUTTON_HEIGHT)/2-START_BUTTON_HEIGHT,
		START_BUTTON_WIDTH,
		START_BUTTON_HEIGHT,
		"name:",
	)
	playerLabel.Bg = color.Black
	m.widgets = append(m.widgets, playerLabel)

	playerInput := ui.NewTextInput(
		(m.width-START_BUTTON_WIDTH)/2,
		(m.height-START_BUTTON_HEIGHT)/2-START_BUTTON_HEIGHT,
		START_BUTTON_WIDTH,
		START_BUTTON_HEIGHT,
		"player name",
	)

	if m.playerName != "" {
		playerInput.AddInput([]rune(m.playerName))
	}

	m.widgets = append(m.widgets, playerInput)

	m.widgets = append(m.widgets, ui.NewSimpleButton(
		(m.width-START_BUTTON_WIDTH)/2,
		(m.height-START_BUTTON_HEIGHT)/2,
		START_BUTTON_WIDTH,
		START_BUTTON_HEIGHT,
		"Start",
		func(*ui.SimpleButton) {
			m.playerName = playerInput.Text()
			m.app.active = m.next()
		}))
}

func (m *StartMenu) Update() error {
	if m.widgets == nil {
		m.build()
	}

	x, y := ebiten.CursorPosition()

	var activeWidget ui.Widget
	for _, w := range m.widgets {
		if !w.Contains(x, y) {
			continue
		}
		activeWidget = w
		break
	}

	if activeWidget == nil {
		return nil
	}

	scrollX, scrollY := ebiten.Wheel()
	if scrollX != 0 || scrollY != 0 {
		if scrollable, ok := activeWidget.(ui.Scrollable); ok {
			scrollable.Scroll(int(scrollX), int(scrollY))
		}
	}

	if textInput, ok := activeWidget.(*ui.TextInput); ok {
		// var input []rune
		// ebiten.AppendInputChars(input)
		input := ebiten.InputChars()
		if len(input) > 0 {
			textInput.AddInput(input)
		}
		textInput.HandleKey()
	}

	if inpututil.IsMouseButtonJustPressed(ebiten.MouseButtonLeft) {
		if btn, ok := activeWidget.(ui.Button); ok {
			btn.Click(x, y)
		}
	}

	return nil
}

func (m *StartMenu) Draw(screen *ebiten.Image) {
	for _, w := range m.widgets {
		w.Draw(screen)
	}
}

func (m *StartMenu) Layout(width, height int) (int, int) {
	return m.width, m.height
}

func (m *StartMenu) next() ebiten.Game {
	if m.remote != "" {
		log.Fatal("Remote games are currently not implemented")
	}

	g := newGame(m.app).loadMap(m.mapPath).addActivePlayer(m.playerName, m.startDeck)

	if m.mapPath == "the-kraken" {
		idx := len(g.gameState.Players)
		color := playerColors[idx]
		g.gameState.AddKraken()
		g.gameState.Players[idx].Color = color
	}

	return g.Start()
}