package hud

import (
	"fmt"

	"github.com/chompy/roguelike_rpg/internal/client/gfx"
	"github.com/hajimehoshi/ebiten/v2"
	"github.com/hajimehoshi/ebiten/v2/text/v2"
)

const (
	damageTextYOffset = 12
)

type DamageText struct {
	BaseElement
	Image  *ebiten.Image
	Start  float32
	Active bool
	font   *gfx.Font
}

func NewDamageText(gfx *gfx.Context, damage int) (*DamageText, error) {
	font, err := gfx.FontLibrary.GetOne("damage")
	if err != nil {
		return nil, err
	}

	op := &text.DrawOptions{}
	if damage < 0 {
		damage = -1 * damage
		op.ColorScale.Scale(0, 1, 0, 1)
	}

	damageText := fmt.Sprintf("%d", damage)
	w, h := text.Measure(damageText, font.Font, 0)
	image := ebiten.NewImage(int(w), int(h))

	text.Draw(image, damageText, font.Font, op)

	return &DamageText{
		Image:  image,
		Start:  GetTime(),
		Active: true,
		font:   font,
	}, nil
}

func (d *DamageText) Draw(time float32, screen *ebiten.Image) (bool, error) {
	op := &ebiten.DrawImageOptions{}
	op.GeoM.Translate(float64(d.X), float64(d.Y+damageTextYOffset))
	isPlaying, err := d.font.ApplyEffects(time-d.Start, op)
	if err != nil {
		return false, err
	}
	screen.DrawImage(d.Image, op)
	return isPlaying, nil
}