package svgtemplate

import (
	"io"
	"os"
	"path/filepath"
	"text/template"
)

const svgTemplate = `<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<svg xmlns="http://www.w3.org/2000/svg" width="{{.Size}}mm" height="{{.Size}}mm" viewBox="{{.ViewBoxMin}} {{.ViewBoxMin}} {{.ViewBoxSize}} {{.ViewBoxSize}}">
  <defs>
    <clipPath id="item-mask">
      <rect x="0" y="0" width="{{.MaskSize}}" height="{{.MaskSize}}" rx="5" ry="5" />
    </clipPath>
  </defs>

  <rect x="{{.ViewBoxMin}}" y="{{.ViewBoxMin}}" width="{{.ViewBoxSize}}" height="{{.ViewBoxSize}}" fill="#f9f9f9" />

  <g clip-path="url(#item-mask)">
    <rect x="{{.OuterOffset}}" y="{{.OuterOffset}}" width="{{.OuterSize}}" height="{{.OuterSize}}" fill="#00FF00" opacity="0.7" />
  </g>

  <rect x="{{.InnerOffset}}" y="{{.InnerOffset}}" width="{{.InnerSize}}" height="{{.InnerSize}}" fill="none" stroke="#0000FF" stroke-width="0.3" stroke-dasharray="1,1" />

  <rect x="0" y="0" width="{{.MaskSize}}" height="{{.MaskSize}}" fill="none" stroke="#ccc" stroke-width="0.2" stroke-dasharray="2,2" />

  <g stroke="#000000" stroke-width="0.3">
    <line x1="0" y1="-{{.Bleed}}" x2="0" y2="-{{appendBleed .Bleed .MarkLength}}" />
    <line x1="-{{.Bleed}}" y1="0" x2="-{{appendBleed .Bleed .MarkLength}}" y2="0" />

    <line x1="{{.Size}}" y1="-{{.Bleed}}" x2="{{.Size}}" y2="-{{appendBleed .Bleed .MarkLength}}" />
    <line x1="{{add .Size .Bleed}}" y1="0" x2="{{addThree .Size .Bleed .MarkLength}}" y2="0" />

    <line x1="0" y1="{{add .Size .Bleed}}" x2="0" y2="{{addThree .Size .Bleed .MarkLength}}" />
    <line x1="-{{.Bleed}}" y1="{{.Size}}" x2="-{{appendBleed .Bleed .MarkLength}}" y2="{{.Size}}" />

    <line x1="{{.Size}}" y1="{{add .Size .Bleed}}" x2="{{.Size}}" y2="{{addThree .Size .Bleed .MarkLength}}" />
    <line x1="{{add .Size .Bleed}}" y1="{{.Size}}" x2="{{addThree .Size .Bleed .MarkLength}}" y2="{{.Size}}" />
  </g>
</svg>
`

var tmpl = template.Must(
	template.New("svg").Funcs(template.FuncMap{
		"appendBleed": func(bleed, mark float64) float64 { return bleed + mark },
		"add":         func(a, b float64) float64 { return a + b },
		"addThree":    func(a, b, c float64) float64 { return a + b + c },
	}).Parse(svgTemplate),
)

// Write renders the SVG template to w.
func Write(w io.Writer, data Data) error {
	return tmpl.Execute(w, data)
}

// OutputDir is the directory where generated SVG files are written.
const OutputDir = "svg_template"

// WriteFile renders the SVG template into OutputDir.
func WriteFile(path string, data Data) error {
	outPath := filepath.Join(OutputDir, filepath.Base(filepath.Clean(path)))
	if err := os.MkdirAll(OutputDir, 0o755); err != nil {
		return err
	}

	file, err := os.Create(outPath)
	if err != nil {
		return err
	}
	defer file.Close()

	if err := Write(file, data); err != nil {
		return err
	}
	return file.Close()
}