package mvg

import "image/color"
import "github.com/hajimehoshi/ebiten/v2"

type Color color.RGBA

func (c Color) Eval(gc *GraphicContext) Value {
	return c
}

type Compliance int

const ComplianceSVG = Compliance(1)
const ComplianceMVG = Compliance(2)

type Stroke int

const StrokeNone = 0
const StrokeSolid = 1

type FillRule = ebiten.FillRule

const FillRuleAll = FillRule(0)
const FillRuleEvenOdd = FillRule(1)

type GradientUnits int

const (
	GradientUnitUserSpace         = GradientUnits(iota)
	GradientUnitUserSpaceOnUse    = GradientUnits(iota)
	GradientUnitObjectBoundingBox = GradientUnits(iota)
)

func (LinearGradient) IsDef() {
}

type Encoding int

// only utf-8 is supported for now.
const EncodingUtf8 = Encoding(0)

type Box struct {
	X, Y, W, H float32
}

type Coord struct {
	X, Y float32
}

type GraphicContext struct {
	Parent    *GraphicContext
	Children  []*GraphicContext
	Variables map[string]Value
	Name      string
	Compliance
	Fill        Color
	FillOpacity float32
	Stroke
	StrokeWidth float32
	FillRule
	Encoding
	ViewBox    Box
	Affine     ebiten.GeoM
	Defs       map[string]DefValue
	FontSize   float32
	FontStyle  string
	FontWeight string
	FontFamily string
}

type Def interface {
	IsDef()
}

type DefValue struct {
	Def
}

func (d DefValue) Eval(gc *GraphicContext) Value {
	return d
}

type Stop []struct {
	Name  string
	Index int
	Color Color
}

type CommonGradient struct {
	Name  string
	Stops []Stop
	GradientUnits
	Affine ebiten.GeoM
}

func (CommonGradient) IsDef() {
}

type LinearGradient struct {
	From Coord
	To   Coord
	CommonGradient
}

type RadialGradient struct {
	CommonGradient
	Center Coord
	Focus  Coord
	Radius float32
}

/*
push graphic-context "svg5"
compliance "SVG"
fill "black"
fill-opacity 1
stroke "none"
stroke-width 1
stroke-opacity 1
fill-rule nonzero
encoding "UTF-8"
viewbox 0 0 794 1123
affine 3.78095 0 0 3.78114 0 0
push defs
push gradient "linearGradient5432" linear 0,0 0,0
stop-color "#ffff00" 0
stop-color "#ffff00" 1
pop gradient
push gradient "linearGradient5344" linear 0,0 0,0
stop-color "#0000ff" 0
stop-color "#0000ff" 1
pop gradient
push gradient "linearGradient5346" linear 89.1931,92.1651 177.979,92.1651
gradient-units "userSpaceOnUse"
pop gradient
push gradient "radialGradient5434" radial 70.2149,52.3642 70.2149,52.3642 39.4705
affine 1 0 0 0.954439 0 2.38575
gradient-units "userSpaceOnUse"
pop gradient
pop defs
push graphic-context "layer1"
push graphic-context "path49"
fill "url(#radialGradient5434)"
stroke-width 0.264583
fill-opacity "1"
class "ellipse"
ellipse 70.2149,52.3642 39.4705,37.6722 0,360
pop graphic-context
push graphic-context "text1574"
class "text"
translate 59.1728,104.719
font-size 10.5833
font-style "normal"
font-weight "normal"
font-size 10.5833
font-family "sans-serif"
fill "#000000"
fill-opacity "1"
stroke "none"
stroke-width 0.264583
text 0,0 "     "
push graphic-context "tspan1576"
stroke-width 0.264583
class "tspan"
text 0,0 "hello"
pop graphic-context
pop graphic-context
push graphic-context "rect4440"
fill "url(#linearGradient5346)"
stroke-width 0.264583
fill-opacity "1"
class "rect"
rectangle 89.1931,51.9326 177.979,132.398
pop graphic-context
push graphic-context "rect5458"
fill "#0000ff"
stroke-width 0.264583
class "rect"
rectangle 31.8962,133.123 68.7693,155.595
pop graphic-context
pop graphic-context
pop graphic-context
*/