package style

import (
	"fmt"
	"math"
	"regexp"

	"oss.terrastruct.com/d2/d2target"
	"oss.terrastruct.com/d2/lib/color"
	"oss.terrastruct.com/d2/lib/svg"
)

func ShapeStyle(shape d2target.Shape) string {
	out := ""

	out += fmt.Sprintf(`opacity:%f;`, shape.Opacity)
	out += fmt.Sprintf(`stroke-width:%d;`, shape.StrokeWidth)
	if shape.StrokeDash != 0 {
		dashSize, gapSize := svg.GetStrokeDashAttributes(float64(shape.StrokeWidth), shape.StrokeDash)
		out += fmt.Sprintf(`stroke-dasharray:%f,%f;`, dashSize, gapSize)
	}

	return out
}

func ShapeTheme(shape d2target.Shape) (fill, stroke string) {
	if shape.Type == d2target.ShapeSQLTable || shape.Type == d2target.ShapeClass {
		// Fill is used for header fill in these types
		// This fill property is just background of rows
		fill = shape.Stroke
		// Stroke (border) of these shapes should match the header fill
		stroke = shape.Fill
	} else {
		fill = shape.Fill
		stroke = shape.Stroke
	}
	return fill, stroke
}

func ConnectionStyle(connection d2target.Connection) string {
	out := ""

	out += fmt.Sprintf(`opacity:%f;`, connection.Opacity)
	out += fmt.Sprintf(`stroke-width:%d;`, connection.StrokeWidth)
	if connection.StrokeDash != 0 {
		dashSize, gapSize := svg.GetStrokeDashAttributes(float64(connection.StrokeWidth), connection.StrokeDash)
		out += fmt.Sprintf(`stroke-dasharray:%f,%f;`, dashSize, gapSize)
	}

	return out
}

func ConnectionTheme(connection d2target.Connection) (stroke string) {
	return connection.Stroke
}

// ThemableElement is a helper class for creating new XML elements.
// This should be preffered over formatting and must be used
// whenever Fill, Stroke, BackgroundColor or Color contains a color from a theme.
// i.e. N[1-7] | B[1-6] | AA[245] | AB[45]
type ThemableElement struct {
	tag string

	X      float64
	X1     float64
	X2     float64
	Y      float64
	Y1     float64
	Y2     float64
	Width  float64
	Height float64
	R      float64
	Rx     float64
	Ry     float64
	Cx     float64
	Cy     float64

	D         string
	Mask      string
	Points    string
	Transform string
	Href      string
	Xmlns     string

	Fill            string
	Stroke          string
	BackgroundColor string
	Color           string

	Class      string
	Style      string
	Attributes string

	Content string
}

func NewThemableElement(tag string) *ThemableElement {
	return &ThemableElement{
		tag,
		math.MaxFloat64,
		math.MaxFloat64,
		math.MaxFloat64,
		math.MaxFloat64,
		math.MaxFloat64,
		math.MaxFloat64,
		math.MaxFloat64,
		math.MaxFloat64,
		math.MaxFloat64,
		math.MaxFloat64,
		math.MaxFloat64,
		math.MaxFloat64,
		math.MaxFloat64,
		"",
		"",
		"",
		"",
		"",
		"",
		color.Empty,
		color.Empty,
		color.Empty,
		color.Empty,
		"",
		"",
		"",
		"",
	}
}

func (el *ThemableElement) Render() string {
	re := regexp.MustCompile(`^N[1-7]|B[1-6]|AA[245]|AB[45]$`)

	out := "<" + el.tag

	if el.X != math.MaxFloat64 {
		out += fmt.Sprintf(` x="%f"`, el.X)
	}
	if el.X1 != math.MaxFloat64 {
		out += fmt.Sprintf(` x1="%f"`, el.X1)
	}
	if el.X2 != math.MaxFloat64 {
		out += fmt.Sprintf(` x2="%f"`, el.X2)
	}
	if el.Y != math.MaxFloat64 {
		out += fmt.Sprintf(` y="%f"`, el.Y)
	}
	if el.Y1 != math.MaxFloat64 {
		out += fmt.Sprintf(` y1="%f"`, el.Y1)
	}
	if el.Y2 != math.MaxFloat64 {
		out += fmt.Sprintf(` y2="%f"`, el.Y2)
	}
	if el.Width != math.MaxFloat64 {
		out += fmt.Sprintf(` width="%f"`, el.Width)
	}
	if el.Height != math.MaxFloat64 {
		out += fmt.Sprintf(` height="%f"`, el.Height)
	}
	if el.R != math.MaxFloat64 {
		out += fmt.Sprintf(` r="%f"`, el.R)
	}
	if el.Rx != math.MaxFloat64 {
		out += fmt.Sprintf(` rx="%f"`, el.Rx)
	}
	if el.Ry != math.MaxFloat64 {
		out += fmt.Sprintf(` ry="%f"`, el.Ry)
	}
	if el.Cx != math.MaxFloat64 {
		out += fmt.Sprintf(` cx="%f"`, el.Cx)
	}
	if el.Cy != math.MaxFloat64 {
		out += fmt.Sprintf(` cy="%f"`, el.Cy)
	}

	if len(el.D) > 0 {
		out += fmt.Sprintf(` d="%s"`, el.D)
	}
	if len(el.Mask) > 0 {
		out += fmt.Sprintf(` mask="%s"`, el.Mask)
	}
	if len(el.Points) > 0 {
		out += fmt.Sprintf(` points="%s"`, el.Points)
	}
	if len(el.Transform) > 0 {
		out += fmt.Sprintf(` transform="%s"`, el.Transform)
	}
	if len(el.Href) > 0 {
		out += fmt.Sprintf(` href="%s"`, el.Href)
	}
	if len(el.Xmlns) > 0 {
		out += fmt.Sprintf(` xmlns="%s"`, el.Xmlns)
	}

	class := el.Class
	style := el.Style

	// Add class {property}-{theme color} if the color is from a theme, set the property otherwise
	if re.MatchString(el.Stroke) {
		class += fmt.Sprintf(" stroke-%s", el.Stroke)
	} else if len(el.Stroke) > 0 {
		out += fmt.Sprintf(` stroke="%s"`, el.Stroke)
	}
	if re.MatchString(el.Fill) {
		class += fmt.Sprintf(" fill-%s", el.Fill)
	} else if len(el.Fill) > 0 {
		out += fmt.Sprintf(` fill="%s"`, el.Fill)
	}
	if re.MatchString(el.BackgroundColor) {
		class += fmt.Sprintf(" background-color-%s", el.BackgroundColor)
	} else if len(el.BackgroundColor) > 0 {
		out += fmt.Sprintf(` background-color="%s"`, el.BackgroundColor)
	}
	if re.MatchString(el.Color) {
		class += fmt.Sprintf(" color-%s", el.Color)
	} else if len(el.Color) > 0 {
		out += fmt.Sprintf(` color="%s"`, el.Color)
	}

	if len(class) > 0 {
		out += fmt.Sprintf(` class="%s"`, class)
	}
	if len(style) > 0 {
		out += fmt.Sprintf(` style="%s"`, style)
	}
	if len(el.Attributes) > 0 {
		out += fmt.Sprintf(` %s`, el.Attributes)
	}

	if len(el.Content) > 0 {
		return fmt.Sprintf("%s>%s</%s>", out, el.Content, el.tag)
	}
	return out + " />"
}