package utils_test

import (
	"testing"

	"git.sapphic.engineer/roleypoly/v4/utils"
	"github.com/stretchr/testify/assert"
)

const (
	WCAGAA float64 = 3
)

func TestIntToRgb(t *testing.T) {
	r, g, b := utils.IntToRgb(0x123456)
	assert.Equal(t, uint8(0x12), r, "red")
	assert.Equal(t, uint8(0x34), g, "green")
	assert.Equal(t, uint8(0x56), b, "blue")
}

func TestBrighten(t *testing.T) {
	r, g, b := utils.Brighten(0, 0, 0, 0.1)
	assert.Equal(t, uint8(0x19), r)
	assert.Equal(t, uint8(0x19), g)
	assert.Equal(t, uint8(0x19), b)

	r, g, b = utils.Brighten(0x88, 0x88, 0x88, -0.1)
	assert.Equal(t, uint8(0x88-0x19-1), r)
	assert.Equal(t, uint8(0x88-0x19-1), g)
	assert.Equal(t, uint8(0x88-0x19-1), b)
	assert.GreaterOrEqual(t, utils.WCAGRatio(
		utils.Luminance(0x88, 0x88, 0x88),
		utils.Luminance(r, g, b),
	), WCAGAA)
}

func TestRgbToString(t *testing.T) {
	assert.Equal(t, "#acab69", utils.RgbToString(0xac, 0xab, 0x69))
}

func TestAltColor(t *testing.T) {
	r, g, b := utils.AltColor(0xa2, 0xc2, 0x42)
	assert.Equal(t, uint8(0xf2), r, "red")
	assert.Equal(t, uint8(0xef), g, "green")
	assert.Equal(t, uint8(0xef), b, "blue")
	assert.GreaterOrEqual(t, utils.WCAGRatio(
		utils.Luminance(0xa2, 0xc2, 0x42),
		utils.Luminance(r, g, b),
	), WCAGAA)

	r, g, b = utils.AltColor(0xa2, 0x15, 0x18)
	assert.Equal(t, uint8(0xff), r, "red2")
	assert.Equal(t, uint8(0xed), g, "green2")
	assert.Equal(t, uint8(0xf0), b, "blue2")
	assert.GreaterOrEqual(t, utils.WCAGRatio(
		utils.Luminance(0xa2, 0x15, 0x18),
		utils.Luminance(r, g, b),
	), WCAGAA)

}