/*-------------------------------------------------------------------------
HslColor provides a color object that can be directly consumed by NeoPixelBus

Written by Michael C. Miller.

I invest time and resources providing this open source code,
please support me by dontating (see https://github.com/Makuna/NeoPixelBus)

-------------------------------------------------------------------------
This file is part of the Makuna/NeoPixelBus library.

NeoPixelBus is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation, either version 3 of
the License, or (at your option) any later version.

NeoPixelBus is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with NeoPixel.  If not, see
<http://www.gnu.org/licenses/>.
-------------------------------------------------------------------------*/
#pragma once

// ------------------------------------------------------------------------
// HslColor represents a color object that is represented by Hue, Saturation, Lightness
// component values.  It contains helpful color routines to manipulate the 
// color.
// ------------------------------------------------------------------------
struct HslColor
{

    // ------------------------------------------------------------------------
    // Construct a HslColor using H, S, L values (0.0 - 1.0)
    // L should be limited to between (0.0 - 0.5)
    // ------------------------------------------------------------------------
    HslColor(float h, float s, float l) :
        H(h), S(s), L(l)
    {
    };

    // ------------------------------------------------------------------------
    // Construct a HslColor using RgbColor
    // ------------------------------------------------------------------------
    HslColor(const RgbColor& color);

    // ------------------------------------------------------------------------
    // Construct a HslColor using Rgb48Color
    // ------------------------------------------------------------------------
    HslColor(const Rgb48Color& color);

    // ------------------------------------------------------------------------
    // Construct a HslColor that will have its values set in latter operations
    // CAUTION:  The H,S,L members are not initialized and may not be consistent
    // ------------------------------------------------------------------------
    HslColor()
    {
    };

    // ------------------------------------------------------------------------
    // LinearBlend between two colors by the amount defined by progress variable
    // left - the color to start the blend at
    // right - the color to end the blend at
    // progress - (0.0 - 1.0) value where 0.0 will return left and 1.0 will return right
    //     and a value between will blend the color weighted linearly between them
    // ------------------------------------------------------------------------
    template <typename T_NEOHUEBLEND> static HslColor LinearBlend(const HslColor& left,
        const HslColor& right,
        float progress)
    {
        return HslColor(T_NEOHUEBLEND::HueBlend(left.H, right.H, progress),
            left.S + ((right.S - left.S) * progress),
            left.L + ((right.L - left.L) * progress));
    };

    // ------------------------------------------------------------------------
    // BilinearBlend between four colors by the amount defined by 2d variable
    // c00 - upper left quadrant color
    // c01 - upper right quadrant color
    // c10 - lower left quadrant color
    // c11 - lower right quadrant color
    // x - unit value (0.0 - 1.0) that defines the blend progress in horizontal space
    // y - unit value (0.0 - 1.0) that defines the blend progress in vertical space
    // ------------------------------------------------------------------------
    template <typename T_NEOHUEBLEND> static HslColor BilinearBlend(const HslColor& c00,
        const HslColor& c01,
        const HslColor& c10,
        const HslColor& c11,
        float x,
        float y)
    {
        float v00 = (1.0f - x) * (1.0f - y);
        float v10 = x * (1.0f - y);
        float v01 = (1.0f - x) * y;
        float v11 = x * y;

        return HslColor(
            T_NEOHUEBLEND::HueBlend(
                T_NEOHUEBLEND::HueBlend(c00.H, c10.H, x),
                T_NEOHUEBLEND::HueBlend(c01.H, c11.H, x),
                y),
            c00.S * v00 + c10.S * v10 + c01.S * v01 + c11.S * v11,
            c00.L * v00 + c10.L * v10 + c01.L * v01 + c11.L * v11);
    };

    // ------------------------------------------------------------------------
    // Hue, Saturation, Lightness color members 
    // ------------------------------------------------------------------------
    float H;
    float S;
    float L;

private:
    static void _RgbToHsl(float r, float g, float b, HslColor* color);

};

