package ui

import (
	"log"

	"github.com/hajimehoshi/ebiten/v2"
	"github.com/hajimehoshi/ebiten/v2/inpututil"
)

type InputType int

const (
	Click InputType = iota + 1
	Scroll
	Text
)

type InputEvent struct {
	kind InputType
	x, y int
	ctx  any
}

type ClickCtx struct {
	btn ebiten.MouseButton
}

type ScrollCtx struct {
	scrollX, scrollY int
}

type TextCtx struct {
	in []rune
}

// Input queue
var Input []InputEvent

func consumeInput(i int) {
	log.Println("consume input", i)
	if len(Input) == 1 {
		Input = []InputEvent{}
	} else {
		Input[i] = Input[len(Input)-1]
	}
}

// Update all ui singletons and collect all occurred input
func Update() error {
	Input = []InputEvent{}
	if err := TouchManager.Update(); err != nil {
		return err
	}

	// TODO: make hover detector a singleton

	x, y := ebiten.CursorPosition()
	scrollX, scrollY := ebiten.Wheel()
	if scrollX != 0 || scrollY != 0 {
		Input = append(Input, InputEvent{Scroll, x, y, ScrollCtx{int(scrollX), int(scrollY)}})
	}

	var in []rune
	in = ebiten.AppendInputChars(in)
	if len(in) > 0 {
		Input = append(Input, InputEvent{Text, x, y, TextCtx{in}})
	}

	if inpututil.IsMouseButtonJustPressed(ebiten.MouseButtonLeft) {
		Input = append(Input, InputEvent{Click, x, y, ClickCtx{ebiten.MouseButtonLeft}})
	}

	return nil
}