// Copyright ©2015 The Gonum Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Copyright ©2011-2012 The bíogo Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package palette

import (
	"image/color"
	"reflect"
	"testing"
)

func TestRainbow(t *testing.T) {
	if !reflect.DeepEqual(Rainbow(10, 0, 1, 1, 1, 1), palette{
		color.NRGBA{R: 0xff, G: 0x00, B: 0x00, A: 0xff}, // "#FF0000FF"
		color.NRGBA{R: 0xff, G: 0xaa, B: 0x00, A: 0xff}, // "#FFAA00FF"
		color.NRGBA{R: 0xaa, G: 0xff, B: 0x00, A: 0xff}, // "#AAFF00FF"
		color.NRGBA{R: 0x00, G: 0xff, B: 0x00, A: 0xff}, // "#00FF00FF"
		color.NRGBA{R: 0x00, G: 0xff, B: 0xaa, A: 0xff}, // "#00FFAAFF"
		color.NRGBA{R: 0x00, G: 0xaa, B: 0xff, A: 0xff}, // "#00AAFFFF"
		color.NRGBA{R: 0x00, G: 0x00, B: 0xff, A: 0xff}, // "#0000FFFF"
		color.NRGBA{R: 0xaa, G: 0x00, B: 0xff, A: 0xff}, // "#AA00FFFF"
		color.NRGBA{R: 0xff, G: 0x00, B: 0xaa, A: 0xff}, // "#FF00AAFF"
		color.NRGBA{R: 0xff, G: 0x00, B: 0x00, A: 0xff}, // "#FF0000FF"
	}) {
		t.Error("Rainbow does not agree with R rainbow")
	}
}

func TestHeat(t *testing.T) {
	if !reflect.DeepEqual(Heat(10, 1), palette{
		color.NRGBA{R: 0xff, G: 0x00, B: 0x00, A: 0xff}, // "#FF0000FF"
		color.NRGBA{R: 0xff, G: 0x24, B: 0x00, A: 0xff}, // "#FF2400FF"
		color.NRGBA{R: 0xff, G: 0x49, B: 0x00, A: 0xff}, // "#FF4900FF"
		color.NRGBA{R: 0xff, G: 0x6d, B: 0x00, A: 0xff}, // "#FF6D00FF"
		color.NRGBA{R: 0xff, G: 0x92, B: 0x00, A: 0xff}, // "#FF9200FF"
		color.NRGBA{R: 0xff, G: 0xb6, B: 0x00, A: 0xff}, // "#FFB600FF"
		color.NRGBA{R: 0xff, G: 0xdb, B: 0x00, A: 0xff}, // "#FFDB00FF"
		color.NRGBA{R: 0xff, G: 0xff, B: 0x00, A: 0xff}, // "#FFFF00FF"
		color.NRGBA{R: 0xff, G: 0xff, B: 0x3f, A: 0xff}, // "#FFFF40FF" Off by one compared to R.
		color.NRGBA{R: 0xff, G: 0xff, B: 0xbF, A: 0xff}, // "#FFFFBFFF"
	}) {
		t.Error("Heat does not agree with R heat.colors (ish)")
	}
}

func TestRadial(t *testing.T) {
	rad := Radial(10, Cyan, Magenta, 1)
	if !reflect.DeepEqual(rad, divergingPalette{
		color.NRGBA{R: 0x7f, G: 0xff, B: 0xff, A: 0xff}, // "#80FFFFFF" Off by one compared to R.
		color.NRGBA{R: 0x99, G: 0xff, B: 0xff, A: 0xff}, // "#99FFFFFF"
		color.NRGBA{R: 0xb3, G: 0xff, B: 0xff, A: 0xff}, // "#B3FFFFFF"
		color.NRGBA{R: 0xcc, G: 0xff, B: 0xff, A: 0xff}, // "#CCFFFFFF"
		color.NRGBA{R: 0xe6, G: 0xff, B: 0xff, A: 0xff}, // "#E6FFFFFF" - middle low
		color.NRGBA{R: 0xff, G: 0xe6, B: 0xff, A: 0xff}, // "#FFE6FFFF" - middle high
		color.NRGBA{R: 0xff, G: 0xcc, B: 0xff, A: 0xff}, // "#FFCCFFFF"
		color.NRGBA{R: 0xff, G: 0xb3, B: 0xff, A: 0xff}, // "#FFB3FFFF"
		color.NRGBA{R: 0xff, G: 0x99, B: 0xff, A: 0xff}, // "#FF99FFFF"
		color.NRGBA{R: 0xff, G: 0x7f, B: 0xff, A: 0xff}, // "#FF80FFFF" Off by one compared to R.
	}) {
		t.Error("Radial does not agree with R cm.colors (ish)")
	}
	if l, h := rad.CriticalIndex(); l != 4 || h != 5 {
		t.Errorf("Radial(10...) gives unexpected critical index values: %d and %d", l, h)
	}
}