package hero

import (
	"bytes"
	"github.com/hajimehoshi/ebiten/v2"
	"gitlab.com/kbr4/9heroja/configuration"
	"gitlab.com/kbr4/9heroja/resources"
	"image"
	"log"
	"time"
)

const WalkSpeedMs = 300

var (
	heroImage  *ebiten.Image
	walkTicker *time.Ticker
)

type Hero struct {
	step      int
	direction configuration.Direction
	IsWalking bool
}

type spritePosition struct {
	x int
	y int
}

func (h *Hero) DrawHero(screen *ebiten.Image) {

	// set movement positions to be hashmap of sprite positions for each direction

	movementPositions := map[configuration.Direction][]spritePosition{}
	movementPositions[configuration.North] = []spritePosition{
		{0, 166},
		{33, 166},
		{66, 166},
		{99, 166},
		{132, 166},
		{99, 166},
		{66, 166},
		{33, 166},
	}
	movementPositions[configuration.NorthEast] = []spritePosition{
		{168, 0},
		{201, 0},
		{0, 33},
		{33, 33},
		{66, 33},
		{33, 33},
		{0, 33},
		{201, 0},
	}

	movementPositions[configuration.East] = []spritePosition{
		{132, 99},
		{165, 99},
		{198, 99},
		{0, 132},
		{33, 132},
		{0, 132},
		{198, 99},
		{165, 99},
	}

	movementPositions[configuration.SouthEast] = []spritePosition{
		{33, 66},
		{66, 66},
		{99, 66},
		{132, 66},
		{165, 66},
		{132, 66},
		{99, 66},
		{66, 66},
	}

	movementPositions[configuration.South] = []spritePosition{
		{66, 132},
		{0, 99},
		{33, 99},
		{66, 99},
		{99, 99},
		{66, 99},
		{33, 99},
		{0, 99},
	}

	movementPositions[configuration.SouthWest] = []spritePosition{
		{99, 33},
		{33, 0},
		{66, 0},
		{99, 0},
		{132, 0},
		{99, 0},
		{66, 0},
		{33, 0},
	}

	movementPositions[configuration.West] = []spritePosition{
		{198, 66},
		{99, 132},
		{132, 132},
		{165, 132},
		{198, 132},
		{165, 132},
		{132, 132},
		{99, 132},
	}

	movementPositions[configuration.NorthWest] = []spritePosition{
		{0, 0},
		{132, 33},
		{165, 33},
		{198, 33},
		{0, 66},
		{198, 33},
		{165, 33},
		{132, 33},
	}
	p := movementPositions[h.direction][h.step%8]

	op := &ebiten.DrawImageOptions{}
	screenWidth := screen.Bounds().Max.X
	screenHeight := screen.Bounds().Max.Y

	// ground
	op.GeoM.Reset()
	op.GeoM.Translate(float64(screenWidth/2-16), float64(screenHeight/2-16))
	//op.GeoM.Translate(float64(i*tileSize-floorMod(g.cameraX, tileSize)),
	//		float64((ny-1)*tileSize-floorMod(g.cameraY, tileSize)))

	screen.DrawImage(heroImage.SubImage(image.Rect(p.x+1, p.y, p.x+resources.HeroTileSize, p.y+resources.HeroTileSize)).(*ebiten.Image), op)
}

func init() {
	img, _, err := image.Decode(bytes.NewReader(resources.Hero_png))
	if err != nil {
		log.Fatal(err)
	}
	heroImage = ebiten.NewImageFromImage(img)
	walkTicker = time.NewTicker(WalkSpeedMs * time.Millisecond)
	// go routine that runs on every tick and increases step

}

func NewHero() *Hero {
	hero := &Hero{
		step:      0,
		IsWalking: false,
	}

	go func() {
		for {
			select {
			case <-walkTicker.C:
				hero.step++
				if hero.step > 7 {
					hero.step = 0
				}
			}
		}
	}()
	return hero
}

func (h *Hero) Walk() {

	if !h.IsWalking {
		walkTicker.Reset(WalkSpeedMs * time.Millisecond)
		h.IsWalking = true
	}

}

func (h *Hero) ChangeDirection(d configuration.Direction) {
	if d != configuration.PreviouslyHeld {
		h.direction = d
	}
}

func (h *Hero) Stop() {
	h.step = 2
	walkTicker.Stop()
	h.IsWalking = false
}