esphome-xiaomi_bslamp2/rgb_light.h

#pragma once

#include <array>
#include <stdexcept>
#include <cmath>

namespace esphome {
namespace rgbww {
namespace yeelight_bs2 {

struct RGB {
    float red;
    float green;
    float blue;
};

struct RGBPoint {
    RGB low;
    RGB high;
};

using RGBRing = std::array<RGBPoint, 24>;

using RGBCircle = std::array<RGBRing, 7>;

/**
 * The following table contains GPIO PWM duty cycles as used for driving
 * the LEDs in the device in RGB mode.
 *
 * The base for this table are measurements against the original
 * device firmware, using the RGB color circle as used in
 * Home Assistant as the color space model.
 *
 * This circle has 7 colored rings around a white center point.
 * The outer ring, with the highest saturation, is numbered as 1.
 * The inner ring around the white center point is numbered as 7.
 *
 * For each ring, there are 24 color positions, starting at the
 * color red (0°), going around the circle clockwise via
 * green (120°) and blue (240°).
 *
 * For each color position, two RGB measurements are registered:
 * - one defining the duty cycles at 1% brightness
 * - one defining the duty cycles at 100% brightness
 */
static const RGBCircle rgb_circle_ {{
    // Ring 1, min value RGB component value = 0
    {{ 
        {{ 0.8998, 0.9997, 0.9997 }, { 0.0000, 0.9997, 0.9997 }}, // 0°   [255,0,0] (red)
        {{ 0.8727, 0.9404, 0.9682 }, { 0.0000, 0.6758, 0.9539 }}, // 15°  [255,0,63]
        {{ 0.8727, 0.8967, 0.9677 }, { 0.0000, 0.2389, 0.9506 }}, // 30°  [255,0,126]
        {{ 0.9030, 0.8727, 0.9682 }, { 0.3040, 0.0000, 0.9536 }}, // 45°  [255,0,190]
        {{ 0.9270, 0.8727, 0.9685 }, { 0.5426, 0.0000, 0.9570 }}, // 60°  [255,0,255]
        {{ 0.9404, 0.8727, 0.9687 }, { 0.6753, 0.0000, 0.9590 }}, // 75°  [190,0,255]
        {{ 0.9491, 0.8727, 0.9687 }, { 0.7638, 0.0000, 0.9601 }}, // 90°  [126,0,255]
        {{ 0.9539, 0.8727, 0.9689 }, { 0.8115, 0.0000, 0.9609 }}, // 105° [63,0,255]
        {{ 0.9997, 0.8998, 0.9997 }, { 0.9997, 0.0000, 0.9997 }}, // 120° [0,0,255] (green)
        {{ 0.9553, 0.8727, 0.9672 }, { 0.8264, 0.0000, 0.9452 }}, // 135° [0,63,255]
        {{ 0.9555, 0.8727, 0.9621 }, { 0.8266, 0.0000, 0.8937 }}, // 150° [0,126,255]
        {{ 0.9555, 0.8727, 0.9524 }, { 0.8273, 0.0000, 0.7964 }}, // 165° [0,190,255]
        {{ 0.9555, 0.8727, 0.9375 }, { 0.8285, 0.0000, 0.6469 }}, // 180° [0,255,255]
        {{ 0.9557, 0.8727, 0.9091 }, { 0.8301, 0.0000, 0.3648 }}, // 195° [0,255,190]
        {{ 0.9606, 0.9037, 0.8727 }, { 0.8782, 0.3091, 0.0000 }}, // 210° [0,255,126]
        {{ 0.9677, 0.9514, 0.8727 }, { 0.9486, 0.7856, 0.0000 }}, // 225° [0,255,63]
        {{ 0.9997, 0.9997, 0.8998 }, { 0.9997, 0.9997, 0.0000 }}, // 240° [0,255,0] (blue)
        {{ 0.9652, 0.9652, 0.8727 }, { 0.9245, 0.9252, 0.0000 }}, // 255° [63,255,0]
        {{ 0.9501, 0.9631, 0.8727 }, { 0.7746, 0.9029, 0.0000 }}, // 270° [126,255,0]
        {{ 0.9219, 0.9587, 0.8727 }, { 0.4919, 0.8601, 0.0000 }}, // 285° [190,255,0]
        {{ 0.8786, 0.9521, 0.8727 }, { 0.0584, 0.7946, 0.0000 }}, // 300° [255,255,0]
        {{ 0.8727, 0.9531, 0.9152 }, { 0.0000, 0.8022, 0.4250 }}, // 315° [255,190,0]
        {{ 0.8727, 0.9542, 0.9467 }, { 0.0000, 0.8145, 0.7889 }}, // 330° [255,126,0]
        {{ 0.8728, 0.9547, 0.9631 }, { 0.0000, 0.8207, 0.9044 }}  // 345° [255,63,0]
    }},
    // Ring 2, min value RGB component value = 35
    {{
        {{ 0.8727, 0.9499, 0.9660 }, { 0.0000, 0.7714, 0.9337 }}, // 0°   [255,35,39] (red)
        {{ 0.8727, 0.9255, 0.9665 }, { 0.0000, 0.5268, 0.9365 }}, // 15°  [255,35,90]
        {{ 0.8727, 0.8793, 0.9662 }, { 0.0000, 0.0664, 0.9345 }}, // 30°  [255,35,145]
        {{ 0.9079, 0.8727, 0.9672 }, { 0.3515, 0.0000, 0.9455 }}, // 45°  [255,35,200]
        {{ 0.9270, 0.8727, 0.9680 }, { 0.5429, 0.0000, 0.9519 }}, // 60°  [255,35,255]
        {{ 0.9386, 0.8727, 0.9680 }, { 0.6593, 0.0000, 0.9534 }}, // 75°  [200,35,255]
        {{ 0.9470, 0.8727, 0.9682 }, { 0.7433, 0.0000, 0.9546 }}, // 90°  [145,35,255]
        {{ 0.9524, 0.8727, 0.9682 }, { 0.7961, 0.0000, 0.9552 }}, // 105° [90,35,255]
        {{ 0.9547, 0.8727, 0.9682 }, { 0.8212, 0.0000, 0.9555 }}, // 120° [39,35,255] (green)
        {{ 0.9547, 0.8727, 0.9655 }, { 0.8215, 0.0000, 0.9284 }}, // 135° [35,90,255]
        {{ 0.9550, 0.8727, 0.9600 }, { 0.8217, 0.0000, 0.8712 }}, // 150° [35,145,255]
        {{ 0.9550, 0.8727, 0.9506 }, { 0.8225, 0.0000, 0.7788 }}, // 165° [35,200,255]
        {{ 0.9551, 0.8727, 0.9375 }, { 0.8235, 0.0000, 0.6469 }}, // 180° [35,255,255]
        {{ 0.9547, 0.8727, 0.9150 }, { 0.8212, 0.0000, 0.4226 }}, // 195° [35,255,200]
        {{ 0.9560, 0.8828, 0.8727 }, { 0.8322, 0.1003, 0.0000 }}, // 210° [35,255,145]
        {{ 0.9639, 0.9357, 0.8727 }, { 0.9104, 0.6289, 0.0000 }}, // 225° [35,255,90]
        {{ 0.9675, 0.9610, 0.8727 }, { 0.9475, 0.8803, 0.0000 }}, // 240° [35,255,35] (blue)
        {{ 0.9596, 0.9597, 0.8727 }, { 0.8686, 0.8686, 0.0000 }}, // 255° [90,255,35]
        {{ 0.9430, 0.9570, 0.8727 }, { 0.7023, 0.8435, 0.0000 }}, // 270° [145,255,35]
        {{ 0.9160, 0.9530, 0.8727 }, { 0.4332, 0.8032, 0.0000 }}, // 285° [200,255,35]
        {{ 0.8780, 0.9472, 0.8728 }, { 0.0518, 0.7458, 0.0000 }}, // 300° [255,255,35]
        {{ 0.8727, 0.9477, 0.9099 }, { 0.0000, 0.7497, 0.3717 }}, // 315° [255,200,35]
        {{ 0.8727, 0.9490, 0.9396 }, { 0.0000, 0.7612, 0.6689 }}, // 330° [255,145,35]
        {{ 0.8727, 0.9496, 0.9580 }, { 0.0000, 0.7683, 0.8512 }}  // 345° [255,90,35]
    }},
    // Ring 3, min value RGB component value = 73
    {{
        {{ 0.8727, 0.9352, 0.9609 }, { 0.0000, 0.6244, 0.8822 }}, // 0°   [255,73,76] (red)
        {{ 0.8727, 0.9035, 0.9616 }, { 0.0000, 0.3068, 0.8888 }}, // 15°  [255,73,119]
        {{ 0.8847, 0.8727, 0.9629 }, { 0.1189, 0.0000, 0.9004 }}, // 30°  [255,73,164]
        {{ 0.9121, 0.8727, 0.9650 }, { 0.3936, 0.0000, 0.9237 }}, // 45°  [255,73,209]
        {{ 0.9270, 0.8727, 0.9665 }, { 0.5431, 0.0000, 0.9367 }}, // 60°  [255,73,255]
        {{ 0.9370, 0.8727, 0.9665 }, { 0.6428, 0.0000, 0.9377 }}, // 75°  [209,73,255]
        {{ 0.9445, 0.8727, 0.9665 }, { 0.7182, 0.0000, 0.9386 }}, // 90°  [164,73,255]
        {{ 0.9499, 0.8727, 0.9667 }, { 0.7722, 0.0000, 0.9391 }}, // 105° [119,73,255]
        {{ 0.9534, 0.8727, 0.9667 }, { 0.8066, 0.0000, 0.9396 }}, // 120° [73,73,255] (green)
        {{ 0.9534, 0.8727, 0.9631 }, { 0.8068, 0.0000, 0.9024 }}, // 135° [73,119,255]
        {{ 0.9536, 0.8727, 0.9570 }, { 0.8073, 0.0000, 0.8435 }}, // 150° [73,164,255]
        {{ 0.9536, 0.8727, 0.9487 }, { 0.8081, 0.0000, 0.7602 }}, // 165° [73,209,255]
        {{ 0.9536, 0.8727, 0.9375 }, { 0.8088, 0.0000, 0.6474 }}, // 180° [73,255,255]
        {{ 0.9526, 0.8727, 0.9201 }, { 0.7990, 0.0000, 0.4736 }}, // 195° [73,255,209]
        {{ 0.9509, 0.8727, 0.8866 }, { 0.7804, 0.0000, 0.1383 }}, // 210° [73,255,164]
        {{ 0.9557, 0.9109, 0.8727 }, { 0.8291, 0.3813, 0.0000 }}, // 225° [73,255,119]
        {{ 0.9606, 0.9455, 0.8727 }, { 0.8798, 0.7268, 0.0000 }}, // 240° [73,255,73] (blue)
        {{ 0.9499, 0.9439, 0.8727 }, { 0.7714, 0.7107, 0.0000 }}, // 255° [119,255,73]
        {{ 0.9329, 0.9414, 0.8727 }, { 0.6005, 0.6855, 0.0000 }}, // 270° [164,255,73]
        {{ 0.9086, 0.9377, 0.8727 }, { 0.5381, 0.6496, 0.0000 }}, // 285° [209,255,73]
        {{ 0.8760, 0.9329, 0.8727 }, { 0.0314, 0.6013, 0.0000 }}, // 300° [255,255,73]
        {{ 0.8727, 0.9331, 0.9052 }, { 0.0000, 0.6027, 0.3248 }}, // 315° [255,209,73]
        {{ 0.8727, 0.9340, 0.9316 }, { 0.0000, 0.6130, 0.5876 }}, // 330° [255,164,73]
        {{ 0.8727, 0.9347, 0.9499 }, { 0.0000, 0.6202, 0.7717 }}  // 345° [255,119,73]
    }},
    // Ring 4, min value RGB component value = 109
    {{
        {{ 0.8727, 0.9114, 0.9526 }, { 0.0000, 0.3850, 0.7983 }}, // 0°   [255,109,112] (red)
        {{ 0.8727, 0.8788, 0.9541 }, { 0.0000, 0.0615, 0.8125 }}, // 15°  [255,109,145]
        {{ 0.8979, 0.8727, 0.9587 }, { 0.2526, 0.0000, 0.8586 }}, // 30°  [255,109,182]
        {{ 0.9160, 0.8727, 0.9619 }, { 0.4311, 0.0000, 0.8906 }}, // 45°  [255,109,218]
        {{ 0.9272, 0.8727, 0.9639 }, { 0.6254, 0.0000, 0.9111 }}, // 60°  [255,109,255]
        {{ 0.9352, 0.8727, 0.9639 }, { 0.6254, 0.0000, 0.9111 }}, // 75°  [218,109,255]
        {{ 0.9419, 0.8727, 0.9639 }, { 0.6909, 0.0000, 0.9116 }}, // 90°  [182,109,255]
        {{ 0.9472, 0.8727, 0.9639 }, { 0.7438, 0.0000, 0.9119 }}, // 105° [145,109,255]
        {{ 0.9509, 0.8727, 0.9640 }, { 0.7814, 0.0000, 0.9121 }}, // 120° [109,109,255] (green)
        {{ 0.9509, 0.7827, 0.9599 }, { 0.7819, 0.0000, 0.7813 }}, // 135° [109,145,255]
        {{ 0.9509, 0.7827, 0.9541 }, { 0.7824, 0.0000, 0.8135 }}, // 150° [109,182,255]
        {{ 0.9511, 0.7827, 0.9467 }, { 0.7829, 0.0000, 0.7409 }}, // 165° [109,218,255]
        {{ 0.9512, 0.7827, 0.9376 }, { 0.7837, 0.0000, 0.6484 }}, // 180° [109,255,255]
        {{ 0.9494, 0.7827, 0.9245 }, { 0.7661, 0.0000, 0.5188 }}, // 195° [109,255,218]
        {{ 0.9465, 0.7827, 0.9035 }, { 0.7373, 0.0000, 0.3073 }}, // 210° [109,255,182]
        {{ 0.9435, 0.8810, 0.8727 }, { 0.7077, 0.0083, 0.0000 }}, // 225° [109,255,145]
        {{ 0.9491, 0.9190, 0.8727 }, { 0.7633, 0.4624, 0.0000 }}, // 240° [109,255,109] (blue)
        {{ 0.9372, 0.9171, 0.8727 }, { 0.6443, 0.4450, 0.0000 }}, // 255° [145,255,109]
        {{ 0.9204, 0.9147, 0.8727 }, { 0.4760, 0.4209, 0.0000 }}, // 270° [182,255,109]
        {{ 0.8991, 0.9119, 0.8727 }, { 0.2651, 0.3906, 0.0000 }}, // 285° [218,255,109]
        {{ 0.8727, 0.9081, 0.8730 }, { 0.0000, 0.3540, 0.0034 }}, // 300° [255,255,109]
        {{ 0.8727, 0.9094, 0.9016 }, { 0.0000, 0.3652, 0.2871 }}, // 315° [255,218,109]
        {{ 0.8727, 0.9101, 0.9236 }, { 0.0000, 0.3737, 0.5083 }}, // 330° [255,182,109]
        {{ 0.8727, 0.9109, 0.9411 }, { 0.0000, 0.3805, 0.6833 }}  // 345° [255,145,109]
    }},
    // Ring 5, min value RGB component value = 145
    {{
        {{ 0.8727, 0.8783, 0.9416 }, { 0.0000, 0.0566, 0.6879 }}, // 0°   [255,145,147] (red)
        {{ 0.8916, 0.8727, 0.9484 }, { 0.1869, 0.0000, 0.7575 }}, // 15°  [255,145,172]
        {{ 0.9081, 0.8727, 0.9539 }, { 0.3550, 0.0000, 0.8110 }}, // 30°  [255,145,200]
        {{ 0.9191, 0.8727, 0.9572 }, { 0.4646, 0.0000, 0.8460 }}, // 45°  [255,145,227]
        {{ 0.9272, 0.8727, 0.9600 }, { 0.5444, 0.0000, 0.8712 }}, // 60°  [255,145,255]
        {{ 0.9336, 0.8727, 0.9600 }, { 0.6074, 0.0000, 0.8713 }}, // 75°  [227,145,255]
        {{ 0.9387, 0.8727, 0.9600 }, { 0.6603, 0.0000, 0.8712 }}, // 90°  [200,145,255]
        {{ 0.9435, 0.8727, 0.9600 }, { 0.7071, 0.0000, 0.8712 }}, // 105° [172,145,255]
        {{ 0.9472, 0.8727, 0.9600 }, { 0.7442, 0.0000, 0.8713 }}, // 120° [145,145,255] (green)
        {{ 0.9472, 0.8727, 0.9557 }, { 0.7446, 0.0000, 0.8311 }}, // 135° [145,172,255]
        {{ 0.9472, 0.8727, 0.9506 }, { 0.7451, 0.0000, 0.7798 }}, // 150° [145,200,255]
        {{ 0.9472, 0.8727, 0.9447 }, { 0.7456, 0.0000, 0.7208 }}, // 165° [145,227,255]
        {{ 0.9475, 0.8727, 0.9377 }, { 0.7463, 0.0000, 0.6498 }}, // 180° [145,255,255]
        {{ 0.9450, 0.8727, 0.9286 }, { 0.7228, 0.0000, 0.5588 }}, // 195° [145,255,227]
        {{ 0.9419, 0.8727, 0.9160 }, { 0.6904, 0.0000, 0.4319 }}, // 210° [145,255,200]
        {{ 0.9367, 0.8727, 0.8960 }, { 0.6393, 0.0000, 0.2328 }}, // 225° [145,255,172]
        {{ 0.9316, 0.8793, 0.8727 }, { 0.5890, 0.0666, 0.0000 }}, // 240° [145,255,145] (blue)
        {{ 0.9199, 0.8778, 0.8727 }, { 0.4716, 0.0505, 0.0000 }}, // 255° [172,255,145]
        {{ 0.9050, 0.8757, 0.8727 }, { 0.3227, 0.0003, 0.0000 }}, // 270° [200,255,145]
        {{ 0.8878, 0.8735, 0.8727 }, { 0.1513, 0.0064, 0.0000 }}, // 285° [227,255,145]
        {{ 0.8727, 0.8760, 0.8781 }, { 0.0000, 0.0316, 0.0528 }}, // 300° [255,255,145]
        {{ 0.8727, 0.8766, 0.8990 }, { 0.0000, 0.0398, 0.2607 }}, // 315° [255,227,145]
        {{ 0.8727, 0.8775, 0.9160 }, { 0.0000, 0.0465, 0.4316 }}, // 330° [255,200,145]
        {{ 0.8727, 0.8778, 0.9306 }, { 0.0000, 0.0523, 0.5798 }}  // 345° [255,172,145]
    }},
    // Ring 6, min value RGB component value = 181
    {{
        {{ 0.8980, 0.8727, 0.9391 }, { 0.5784, 0.4409, 0.8030 }}, // 0°   [255,181,182] (red)
        {{ 0.9079, 0.8727, 0.9445 }, { 0.6330, 0.4409, 0.8327 }}, // 15°  [255,181,199]
        {{ 0.9162, 0.8727, 0.9486 }, { 0.6774, 0.4409, 0.8556 }}, // 30°  [255,181,218]
        {{ 0.9221, 0.8727, 0.9519 }, { 0.7104, 0.4409, 0.8725 }}, // 45°  [255,181,236]
        {{ 0.9272, 0.8727, 0.9545 }, { 0.7382, 0.4409, 0.8866 }}, // 60°  [255,181,255]
        {{ 0.9316, 0.8727, 0.9545 }, { 0.7618, 0.4409, 0.8863 }}, // 75°  [236,181,255]
        {{ 0.9355, 0.8727, 0.9544 }, { 0.7827, 0.4409, 0.8861 }}, // 90°  [218,181,255]
        {{ 0.9391, 0.8727, 0.9542 }, { 0.8025, 0.4409, 0.8859 }}, // 105° [199,181,255]
        {{ 0.9421, 0.8727, 0.9542 }, { 0.8191, 0.4409, 0.8859 }}, // 120° [181,181,255] (green)
        {{ 0.9421, 0.8727, 0.9509 }, { 0.8193, 0.4409, 0.8676 }}, // 135° [181,199,255]
        {{ 0.9421, 0.8727, 0.9470 }, { 0.8195, 0.4409, 0.8458 }}, // 150° [181,218,255]
        {{ 0.9424, 0.8727, 0.9429 }, { 0.8197, 0.4409, 0.8230 }}, // 165° [181,236,255]
        {{ 0.9424, 0.8727, 0.9380 }, { 0.8202, 0.4409, 0.7961 }}, // 180° [181,255,255]
        {{ 0.9399, 0.8727, 0.9321 }, { 0.8071, 0.4409, 0.7651 }}, // 195° [181,255,236]
        {{ 0.9370, 0.8727, 0.9252 }, { 0.7912, 0.4409, 0.7274 }}, // 210° [181,255,218]
        {{ 0.9331, 0.8727, 0.9160 }, { 0.7697, 0.4409, 0.6767 }}, // 225° [181,255,199]
        {{ 0.9282, 0.8727, 0.9045 }, { 0.7431, 0.4409, 0.6135 }}, // 240° [181,255,181] (blue)
        {{ 0.9221, 0.8727, 0.9050 }, { 0.7094, 0.4409, 0.6164 }}, // 255° [199,255,181]
        {{ 0.9147, 0.8727, 0.9057 }, { 0.6700, 0.4409, 0.6200 }}, // 270° [218,255,181]
        {{ 0.9074, 0.8727, 0.9062 }, { 0.6296, 0.4409, 0.6240 }}, // 285° [236,255,181]
        {{ 0.8988, 0.8727, 0.9072 }, { 0.5834, 0.4409, 0.6282 }}, // 300° [255,255,181]
        {{ 0.8986, 0.8727, 0.9166 }, { 0.5820, 0.4409, 0.6807 }}, // 315° [255,236,181]
        {{ 0.8985, 0.8727, 0.9250 }, { 0.5805, 0.4409, 0.7258 }}, // 330° [255,218,181]
        {{ 0.8981, 0.8727, 0.9329 }, { 0.5793, 0.4409, 0.7687 }}  // 345° [255,199,181]
    }},
    // Ring 7, min value RGB component value = 219
    {{
        {{ 0.9167, 0.8727, 0.9389 }, { 0.4399, 0.0000, 0.6606 }}, // 0°   [255,219,219] (red)
        {{ 0.9199, 0.8727, 0.9414 }, { 0.4711, 0.0000, 0.6850 }}, // 15°  [255,219,228]
        {{ 0.9226, 0.8727, 0.9432 }, { 0.4992, 0.0000, 0.7068 }}, // 30°  [255,219,237]
        {{ 0.9252, 0.8727, 0.9452 }, { 0.5241, 0.0000, 0.7262 }}, // 45°  [255,219,246]
        {{ 0.9275, 0.8727, 0.9472 }, { 0.5465, 0.0000, 0.7437 }}, // 60°  [255,219,255]
        {{ 0.9294, 0.8727, 0.9470 }, { 0.5675, 0.0000, 0.7432 }}, // 75°  [246,219,255]
        {{ 0.9316, 0.8727, 0.9470 }, { 0.5879, 0.0000, 0.7427 }}, // 90°  [237,219,255]
        {{ 0.9335, 0.8727, 0.9470 }, { 0.6074, 0.0000, 0.7424 }}, // 105° [228,219,255]
        {{ 0.9352, 0.8727, 0.9470 }, { 0.6259, 0.0000, 0.7419 }}, // 120° [219,219,255] (green)
        {{ 0.9352, 0.8727, 0.9450 }, { 0.6262, 0.0000, 0.7217 }}, // 135° [219,228,255]
        {{ 0.9355, 0.8727, 0.9429 }, { 0.6264, 0.0000, 0.7002 }}, // 150° [219,237,255]
        {{ 0.9355, 0.8727, 0.9406 }, { 0.6269, 0.0000, 0.6777 }}, // 165° [219,246,255]
        {{ 0.9355, 0.8727, 0.9381 }, { 0.6272, 0.0000, 0.6540 }}, // 180° [219,255,255]
        {{ 0.9339, 0.8727, 0.9357 }, { 0.6111, 0.0000, 0.6291 }}, // 195° [219,255,246]
        {{ 0.9321, 0.8727, 0.9329 }, { 0.5929, 0.0000, 0.6013 }}, // 210° [219,255,237]
        {{ 0.9301, 0.8727, 0.9299 }, { 0.5729, 0.0000, 0.5703 }}, // 225° [219,255,228]
        {{ 0.9277, 0.8727, 0.9263 }, { 0.5503, 0.0000, 0.5354 }}, // 240° [219,255,219] (blue)
        {{ 0.9252, 0.8727, 0.9265 }, { 0.5249, 0.0000, 0.5368 }}, // 255° [228,255,219]
        {{ 0.9226, 0.8727, 0.9265 }, { 0.4985, 0.0000, 0.5383 }}, // 270° [237,255,219]
        {{ 0.9199, 0.8727, 0.9267 }, { 0.4711, 0.0000, 0.5399 }}, // 285° [246,255,219]
        {{ 0.9170, 0.8727, 0.9270 }, { 0.4426, 0.0000, 0.5414 }}, // 300° [255,255,219]
        {{ 0.9170, 0.8727, 0.9301 }, { 0.4419, 0.0000, 0.5734 }}, // 315° [255,246,219]
        {{ 0.9170, 0.8727, 0.9331 }, { 0.4411, 0.0000, 0.6039 }}, // 330° [255,237,219]
        {{ 0.9167, 0.8727, 0.9360 }, { 0.4406, 0.0000, 0.6330 }}  // 345° [255,228,219]
    }}
}};

class RGBLight
{
public:
    float red = 0;
    float green = 0;
    float blue = 0;
    float white = 0;

    void set_color(float red, float green, float blue, float brightness, float state)
    {
        // Determine the ring level for the color. This is a value between
        // 0 and 7, determining in what ring of the RGB circle the requested
        // color resides.
        auto rgb_min = min(min(red, green), blue);
        auto ring_level = 7.0f * rgb_min;
        auto ring_level_a = floor(ring_level);
        auto ring_level_b = ceil(ring_level);

        // While the default color circle in Home Assistant presents only a
        // subset of colors, it is possible to request colors outside this
        // subset as well. Therefore, the ring level might contain a fractional
        // value instead of a plain integer. To accomodate for this,
        // interpolation will be done to get the final outputs.
        // We'll start here by determining the ring above and below the
        // ring level.
        auto ring_a = rgb_circle_[ring_level_a];
        auto ring_b = rgb_circle_[ring_level_b];

        // Now we have the two rings to work with, we'll have to look at the
        // positions on these rings to determine the RGB value to use for
        // each ring. Here, we have to accomodate as well for the fact that
        // we only have a subset of all colors available in the configuration
        // tables. Therefore, some interpolation is done here as well.
 
        // The ring_pos is basically a hue representation of the requested
        // RGB color. This is expressed as a number of degrees around the
        // color circle, starting with red (at 0°). Since we have 24
        // measurements for each ring, each measurement covers 360°/24 = 15°.
        // Using that knowledge, the measurements to work with can be picked
        // from the rings.
        auto ring_pos = ring_pos_(red, green, blue) / 15.0f;
        auto ring_pos_x = floor(ring_pos);
        auto ring_pos_y = ceil(ring_pos);

        // Find RGB values for ring a.
        auto rgb_a_x = ring_a[ring_pos_x];
        auto rgb_a_y = ring_a[ring_pos_y > 23 ? 0 : ring_pos_y];
        RGBPoint rgbp_a;
        if (ring_pos_x == ring_pos_y) {
            rgbp_a.low.red = rgb_a_x.low.red;
            rgbp_a.low.green = rgb_a_x.low.green;
            rgbp_a.low.blue = rgb_a_x.low.blue;
            rgbp_a.high.red = rgb_a_x.high.red;
            rgbp_a.high.green = rgb_a_x.high.green;
            rgbp_a.high.blue = rgb_a_x.high.blue;
        } else {
            auto d_value = ring_pos - ring_pos_x;
            rgbp_a.low.red = rgb_a_x.low.red + d_value * (rgb_a_y.low.red - rgb_a_x.low.red);
            rgbp_a.low.green = rgb_a_x.low.green + d_value * (rgb_a_y.low.green - rgb_a_x.low.green);
            rgbp_a.low.blue = rgb_a_x.low.blue + d_value * (rgb_a_y.low.blue - rgb_a_x.low.blue);
            rgbp_a.high.red = rgb_a_x.high.red + d_value * (rgb_a_y.high.red - rgb_a_x.high.red);
            rgbp_a.high.green = rgb_a_x.high.green + d_value * (rgb_a_y.high.green - rgb_a_x.high.green);
            rgbp_a.high.blue = rgb_a_x.high.blue + d_value * (rgb_a_y.high.blue - rgb_a_x.high.blue);
        }

        // Find RGB values for ring b.
        auto rgb_b_x = ring_b[ring_pos_x];
        auto rgb_b_y = ring_b[ring_pos_y > 23 ? 0 : ring_pos_y];
        RGBPoint rgbp_b;
        if (ring_pos_x == ring_pos_y) {
            rgbp_b.low.red = rgb_b_x.low.red;
            rgbp_b.low.green = rgb_b_x.low.green;
            rgbp_b.low.blue = rgb_b_x.low.blue;
            rgbp_b.high.red = rgb_b_x.high.red;
            rgbp_b.high.green = rgb_b_x.high.green;
            rgbp_b.high.blue = rgb_b_x.high.blue;
        } else {
            auto d_value = ring_pos - ring_pos_x;
            rgbp_b.low.red = rgb_b_x.low.red + d_value * (rgb_b_y.low.red - rgb_b_x.low.red);
            rgbp_b.low.green = rgb_b_x.low.green + d_value * (rgb_b_y.low.green - rgb_b_x.low.green);
            rgbp_b.low.blue = rgb_b_x.low.blue + d_value * (rgb_b_y.low.blue - rgb_b_x.low.blue);
            rgbp_b.high.red = rgb_b_x.high.red + d_value * (rgb_b_y.high.red - rgb_b_x.high.red);
            rgbp_b.high.green = rgb_b_x.high.green + d_value * (rgb_b_y.high.green - rgb_b_x.high.green);
            rgbp_b.high.blue = rgb_b_x.high.blue + d_value * (rgb_b_y.high.blue - rgb_b_x.high.blue);
        }

        // Now we have the RGB values to use for the two rings, we can
        // apply the requested brightness to the RGB values. Brightness
        // values 0.01 to 1.00 make the RGB values scale linearly. In our
        // RGB values, we have the low (0.01) and high (1.00) value for
        // the RGB values. Combined with the brightness input, the required
        // RGB values can be computed.
        RGB rgb_a;
        rgb_a.red = rgbp_a.low.red + (brightness - 0.01) * (rgbp_a.high.red - rgbp_a.low.red);
        rgb_a.green = rgbp_a.low.green + (brightness - 0.01) * (rgbp_a.high.green - rgbp_a.low.green);
        rgb_a.blue = rgbp_a.low.blue + (brightness - 0.01) * (rgbp_a.high.blue - rgbp_a.low.blue);
        RGB rgb_b;
        rgb_b.red = rgbp_b.low.red + (brightness - 0.01) * (rgbp_b.high.red - rgbp_b.low.red);
        rgb_b.green = rgbp_b.low.green + (brightness - 0.01) * (rgbp_b.high.green - rgbp_b.low.green);
        rgb_b.blue = rgbp_b.low.blue + (brightness - 0.01) * (rgbp_b.high.blue - rgbp_b.low.blue);

        // Almost there! We now have the correct RGB values for the
        // two rings that we were looking at. The last step will interpolate
        // these two values based on the ring level.
        RGB rgb;
        if (ring_level_a == ring_level_b) {
            rgb.red = rgb_a.red;
            rgb.green = rgb_a.green;
            rgb.blue = rgb_a.blue;
        } else {
            auto d_value = ring_level - ring_level_a;
            rgb.red = rgb_a.red + d_value * (rgb_b.red - rgb_a.red);
            rgb.green = rgb_a.green + d_value * (rgb_b.green - rgb_a.green);
            rgb.blue = rgb_a.blue + d_value * (rgb_b.blue - rgb_a.blue);
        }
        if (rgb.red < 0.01f) {
            rgb.red = 0.0f;
        }

        this->red = rgb.red;
        this->green = rgb.green;
        this->blue = rgb.blue;
        this->white = 0.0f;

        ESP_LOGD("rgb", "RGB [%f,%f,%f]", rgb.red, rgb.green, rgb.blue);
    }

protected:
    /**
     * Returns the position on an RGB ring in degrees (0 - 359).
     */
    float ring_pos_(float red, float green, float blue) {
        auto rgb_min = min(min(red, green), blue);
        auto rgb_max = max(max(red, green), blue);
        auto delta = rgb_max - rgb_min;
        float pos; 
        if (delta == 0.0f)
            pos = 0.0f;
        else if (red == rgb_max)
            pos = 60.0f * fmod((green - blue) / delta, 6);
        else if (green == rgb_max)
            pos = 60.0f * ((blue - red) / delta + 2.0f);
        else
            pos = 60.0f * ((red - green) / delta + 4.0f);
        if (pos < 0)
            pos = pos + 360;
        return pos;
    }
};


} // namespace yeelight_bs2
} // namespace rgbww
} // namespace esphome