package descriptors

import (
	"fmt"
	"strings"

	"github.com/gookit/color"

	ui "github.com/DegustatorPonos/RuinesOfRafdolon/UI"
	rl "github.com/gen2brain/raylib-go/raylib"
)

// Using this method instead of the base style structs allows us to use
// hex values as colours since golang's implimetation of JSON deserializer
// doesn't really like color.RGBA
type StyleDescriptor struct {
	BackgroundColor string
	FontColor string
	Padding *float32
	Roundness *float32
}

func (base *StyleDescriptor) Parse() ui.Style {
	var outp = ui.Style {
		BacgroundColor: base.getBackgroundColor(),
		FontColor: base.getFontColor(),
		Roundness: base.Roundness,
		Padding: base.Padding,
	}
	return outp
}

func (base *StyleDescriptor) getBackgroundColor() *rl.Color {
	if len(base.BackgroundColor) == 0 {
		return nil
	}
	var outp, err = parseColor(base.BackgroundColor)
	if err != nil {
		rl.TraceLog(rl.LogWarning, "Failed to parse the background color %s in style: %s", base.BackgroundColor, err.Error())
		return nil
	}
	return outp
}

func (base *StyleDescriptor) getFontColor() *rl.Color {
	if len(base.FontColor) == 0 {
		return nil
	}
	var outp, err = parseColor(base.FontColor)
	if err != nil {
		rl.TraceLog(rl.LogWarning, "Failed to parse the font color %s in style: %s", base.FontColor, err.Error())
		return nil
	}
	return outp
}

func parseColor(val string) (*rl.Color, error) {
	val = strings.TrimPrefix(val, "#")
	if !isColorValid(val) {
		return nil, fmt.Errorf("Invalid color notation") 
	}
	var parsed = color.HEX(val)
	var outp = rl.NewColor(parsed[0], parsed[1], parsed[2], parsed[3])
	// If there is no alpha cahnnel
	if len(val) % 2 == 0 {
		outp.A = 0xFF
	}
	return &outp, nil
}

func isColorValid(val string) bool {
	switch len(val) {
	// #RGB, #RGBA, #RRGGBB, #RRGGBBAA
	case 3, 4, 6, 8:
		return true
	}
	return false
}