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#include "cl_dll.h"
#include "com_model.h"
#include "r_studioint.h"

#include <array>

extern engine_studio_api_t IEngineStudio;

typedef std::array<unsigned char, 3> rgb_color;

// Converts hue (in degrees) to 8bpc linear RGB, with 100% saturation and brightness
constexpr rgb_color hueToRgb(int hue) {
	rgb_color result{};

	if (hue < 0 || hue >= 360) { // Out of range, make it red
		hue = 0;
	}
	
	const int cycleProgress = hue % 120;
	const int channelA = hue / 120;
	const int channelB = (channelA + 1) % result.size();
	if (cycleProgress < 60) {
		// If hue is between   0 and  59 inclusive, channelA is 0. The result is between #FF0000 and #FFFA00 inclusive
		// If hue is between 120 and 179 inclusive, channelA is 1. The result is between #00FF00 and #00FFFA inclusive
		// If hue is between 240 and 299 inclusive, channelA is 2. The result is between #0000FF and #FA00FF inclusive
		result[channelA] = 255;
		result[channelB] = (unsigned char) ((cycleProgress * 255) / 60);
	} else {
		// If hue is between  60 and 119 inclusive, channelA is 0. The result is between #FFFF00 and #04FF00 inclusive
		// If hue is between 180 and 239 inclusive, channelA is 1. The result is between #00FFFF and #0004FF inclusive
		// If hue is between 300 and 359 inclusive, channelA is 2. The result is between #FF00FF and #FF0004 inclusive
		result[channelA] = (unsigned char) (((120 - cycleProgress) * 255) / 60);
		result[channelB] = 255;
	}
	return result;
}

rgb_color getPlayerTopColorRgb(int playerIndex) {
	rgb_color result { 255, 255, 255 };

	if (playerIndex >= 0 && playerIndex < gEngfuncs.GetMaxClients())
		const player_info_t * const playerInfo = IEngineStudio.PlayerInfo(playerIndex);
		if (playerInfo) {
			const int topColorHue = playerInfo->topcolor;
			result = hueToRgb(topColorHue);
		}
	}

	return result;
}

rgb_color getLocalPlayerTopColorRgb() {
	rgb_color result { 255, 255, 255 };

	const cl_entity_t * const localPlayer = gEngfuncs.GetLocalPlayer();
	if (localPlayer) {
		const int playerEntityIndex = localPlayer->index;
		const int playerIndex = playerEntityIndex - 1;
		result = getPlayerTopColorRgb(playerIndex);
	}

	return result;
}