package svg

import "encoding/xml"
import "fmt"

type CoreAttributes struct {
	Chardata string `xml:",chardata"`
	ID       string `xml:"id,attr"`
}

type Stop struct {
	CoreAttributes
	Style  Style  `xml:"style,attr"`
	Offset string `xml:"offset,attr"`
}

type LinearGradient struct {
	CoreAttributes
	Href          string `xml:"href,attr"`
	X1            string `xml:"x1,attr"`
	Y1            string `xml:"y1,attr"`
	X2            string `xml:"x2,attr"`
	Y2            string `xml:"y2,attr"`
	GradientUnits string `xml:"gradientUnits,attr"`
	Stop          []Stop `xml:"stop"`
}

type RadialGradient struct {
	CoreAttributes
	Href              string `xml:"href,attr"`
	Cx                string `xml:"cx,attr"`
	Cy                string `xml:"cy,attr"`
	Fx                string `xml:"fx,attr"`
	Fy                string `xml:"fy,attr"`
	R                 string `xml:"r,attr"`
	GradientTransform string `xml:"gradientTransform,attr"`
	GradientUnits     string `xml:"gradientUnits,attr"`
	Stop              []Stop `xml:"stop"`
}

type Defs struct {
	CoreAttributes
	LinearGradient []LinearGradient `xml:"linearGradient"`
	RadialGradient []RadialGradient `xml:"radialGradient"`
	Drawable       []Drawable
}

type Ellipse struct {
	CoreAttributes
	Style string `xml:"style,attr"`
	Cx    string `xml:"cx,attr"`
	Cy    string `xml:"cy,attr"`
	Rx    string `xml:"rx,attr"`
	Ry    string `xml:"ry,attr"`
}

type Text struct {
	CoreAttributes
	Space string `xml:"space,attr"`
	Style string `xml:"style,attr"`
	X     string `xml:"x,attr"`
	Y     string `xml:"y,attr"`
	Tspan struct {
		CoreAttributes
		Style string `xml:"style,attr"`
		X     string `xml:"x,attr"`
		Y     string `xml:"y,attr"`
	} `xml:"tspan"`
}

type Rect struct {
	Text   string `xml:",chardata"`
	Style  string `xml:"style,attr"`
	ID     string `xml:"id,attr"`
	Width  string `xml:"width,attr"`
	Height string `xml:"height,attr"`
	X      string `xml:"x,attr"`
	Y      string `xml:"y,attr"`
}

type Drawable struct {
	*Rect
	*Ellipse
	*Text
}

func (d *Drawable) UnmarshalXML(dec *xml.Decoder, start xml.StartElement) error {
	var err error
	switch start.Name.Local {
	case "rect":
		r := Rect{}
		err = dec.DecodeElement(&r, &start)
		d.Rect = &r
	case "ellipse":
		r := Ellipse{}
		err = dec.DecodeElement(&r, &start)
		d.Ellipse = &r
	case "text":
		r := Text{}
		err = dec.DecodeElement(&r, &start)
		d.Text = &r
	default:
		return fmt.Errorf("drawable not supported: %s", start)
	}
	return err
}

type G struct {
	CoreAttributes
	Drawable []Drawable `xml:",any"`
}

type SVG struct {
	CoreAttributes
	XMLName xml.Name `xml:"svg"`
	Width   Length   `xml:"width,attr"`
	Height  Length   `xml:"height,attr"`
	ViewBox string   `xml:"viewBox,attr"`
	Version string   `xml:"version,attr"`
	Xlink   string   `xml:"xlink,attr"`
	Xmlns   string   `xml:"xmlns,attr"`
	SVG     string   `xml:"svg,attr"`
	Defs    []Defs   `xml:"defs"`
	G       G        `xml:"g"`
}