package main

import (
	"vultras.su/core/gg"
	"github.com/hajimehoshi/ebiten/v2/examples/resources/images"
	"github.com/hajimehoshi/ebiten/v2/examples/resources/fonts"
	//_ "github.com/silbinarywolf/preferdiscretegpu"
	"bytes"
	"log"
	"fmt"
)

type Context = gg.Context

type Grid struct {
	gg.Sprite
	Cage, Width gg.Float
}

func (grid *Grid) Update(c *Context) {
	//d := c.IsPressed(gg.KeyShift)
	for _, ev := range c.Events { switch e := ev.(type){
	case *gg.KeyDown : switch e.Key {
	case gg.Key9 :
		grid.Cage /= 10
		grid.Width /= 5
	case gg.Key0 :
		grid.Cage *= 10
		grid.Width *= 5
	}}}
}

func (grid *Grid) Draw(c *Context) []gg.EVertex {
	scale := c.Camera.Scale()
	pos := c.Camera.Position()
	grid.Uniforms["Zoom"] = gg.Float(scale.X)
	grid.Uniforms["PosX"] = pos.X
	grid.Uniforms["PosY"] = pos.Y
	grid.Uniforms["Cage"] = grid.Cage
	grid.Uniforms["Width"] = grid.Width
	return grid.Sprite.Draw(c)
}

const (
	HighestL gg.Layer = -iota
	DebugL
	TriangleL
	PlayerL
	RectL
	BackgroundLayer
	LowestL
)

const (
	Stand gg.AnimationId = iota
	Walk
)

var (
	playerAnimations gg.AnimationSet
	playerImg *gg.Image
	player    *Player
	rectMove  gg.Rectangle
	rect      *Rect
	tri       *Tri
)

func main() {
	e := gg.NewEngine(&gg.WindowConfig{
		Title:  "Test title",
		Width:  720,
		Height: 480,
		VSync:  true,
		Fullscreen: false,
	})

	var err error
	playerImg, err = gg.LoadImage(bytes.NewReader(images.Runner_png))
	if err != nil {
		log.Fatal(err)
	}

	rect = NewRect()

	playerAnimations, _ = gg.AnimationSetFromImage(
		playerImg,
		8, 3,
		10, 1,
		gg.AD(Stand).DefRow(0, 0, 1, 2, 3, 4),
		gg.AD(Walk).DefRow(1, 0, 1, 2, 3, 4, 5, 6, 7),
	)
	player = NewPlayer()
	tri = NewTri()

	e.Spawn(&Debug{})
	e.Spawn(player)
	e.Spawn(rect)
	e.Spawn(tri)

	/*circle := &gg.Circle{}
	circle.Transform = gg.T()
	circle.Rotation = 300
	circle.Color = gg.Rgba(1, 1, 1, 1)
	circle.Antialias = true
	circle.Layer = HighestL
	circle.Visible = true*/
	//e.Spawn(circle)

	bgShader := gg.MustNewShader([]byte(`
		package main

		//kage:unit pixels

		//var cameraScaleX, cameraScaleY
		var Zoom float
		var PosX, PosY float
		var Cage float
		var Width float

		const (
		)

		func Fragment(dst vec4, src vec2, _ vec4) vec4 {
			c := imageSrc0UnsafeAt(src)
			dstSize := imageDstSize()/Zoom
			absDst := vec2(
				dst.x/Zoom - dstSize.x/2 - PosX,
				dst.y/Zoom - dstSize.y/2 - PosY,
			)
			cx := c*step(Cage-Width, mod(absDst.x-Width/2, Cage))
			cy := c*step(Cage-Width, mod(absDst.y-Width/2, Cage))
			if cx.a == 0 {
				return cy
			}
			return cx
		}
	`))
	grid := &Grid{}
	grid.Transform = gg.T()
	grid.SetAround(gg.V2(0))
	grid.Layer = BackgroundLayer
	grid.Images[0] = gg.NewImage(720, 480)
	grid.Images[0].Fill(gg.Rgba(1, 1, 1, 1))
	grid.Shader = bgShader
	grid.Uniforms = map[string] any{}
	//bg.Floating = true
	grid.Visible = true
	grid.Floating = true
	grid.Cage = 100
	grid.Width = 5
	e.Spawn(grid)

	txt := &Text{}
	txt.Transform = gg.T()
	//txt.Position = gg.V2(400)
	txt.Color = gg.Rgba(1, 1, 1, 1)
	txt.Layer = HighestL
	txt.Visible = true
	txt.Data = "Hello, World!\nПривет, Мир!"
	txt.Face, err = gg.MakeFaceFromTtf(
		bytes.NewReader(fonts.MPlus1pRegular_ttf),
		&gg.TtfFaceOptions{
			Size: 32,
			DPI: 72,
			Hinting: gg.FontHintingNone,
		},
	)
	if err != nil {
		panic(err)
	}
	e.Spawn(txt)

	//fmt.Println(rect.GetLayer(), player.GetLayer())
	fmt.Println("Starting...")
	err = e.Run()
	if err != nil {
		panic(err)
	}
}