#pragma once

#include <algorithm>
#include <cstdint>
#include <iomanip>
#include <sstream>
#include <string>

namespace OpenVic {
	/* Colour represented by an unsigned integer, either 24-bit RGB or 32-bit ARGB. */
	using colour_t = uint32_t;

	/* When colour_t is used as an identifier, NULL_COLOUR is disallowed
	 * and should be reserved as an error value.
	 * When colour_t is used in a purely graphical context, NULL_COLOUR
	 * should be allowed.
	 */
	static constexpr colour_t NULL_COLOUR = 0, FULL_COLOUR = 0xFF,
		MAX_COLOUR_RGB = 0xFFFFFF, MAX_COLOUR_ARGB = 0xFFFFFFFF;

	constexpr colour_t float_to_colour_byte(float f, float min = 0.0f, float max = 1.0f) {
		return static_cast<colour_t>(std::clamp(min + f * (max - min), min, max) * 255.0f);
	}

	constexpr colour_t fraction_to_colour_byte(int n, int d, float min = 0.0f, float max = 1.0f) {
		return float_to_colour_byte(static_cast<float>(n) / static_cast<float>(d), min, max);
	}

	constexpr colour_t float_to_alpha_value(float a) {
		return float_to_colour_byte(a) << 24;
	}

	constexpr float colour_byte_to_float(colour_t colour) {
		return std::clamp(static_cast<float>(colour) / 255.0f, 0.0f, 1.0f);
	}

	inline std::string colour_to_hex_string(colour_t colour, bool alpha = false) {
		std::ostringstream stream;
		stream << std::uppercase << std::hex << std::setfill('0') << std::setw(!alpha ? 6 : 8) << colour;
		return stream.str();
	}
}