#pragma once

#include "../api/ParticleEmitter.h"

namespace crepe {

/**
 	* \brief ParticleSystem class responsible for managing particle emission, updates, and bounds checking.
 	*/
class ParticleSystem {
public:
	/**
		* \brief Default constructor.
		*/
	ParticleSystem();

	/**
		* \brief Updates all particle emitters by emitting particles, updating particle states, and checking bounds.
		*/
	void update();

private:
	/**
		* \brief Emits a particle from the specified emitter based on its emission properties.
		* 
		* \param emitter Reference to the ParticleEmitter.
		* \param transform Const reference to the Transform component associated with the emitter.
		*/
	void emit_particle(ParticleEmitter & emitter, const Transform& transform);

	/**
		* \brief Calculates the number of times particles should be emitted based on emission rate and update count.
		* 
		* \param count Current update count.
		* \param emission Emission rate.
		* \return The number of particles to emit.
		*/
	int calculate_update(int count, double emission) const;

	/**
		* \brief Checks whether particles are within the emitter’s boundary, resets or stops particles if they exit.
		* 
		* \param emitter Reference to the ParticleEmitter.
		* \param transform Const reference to the Transform component associated with the emitter.
		*/
	void check_bounds(ParticleEmitter & emitter, const Transform& transform);

	/**
		* \brief Generates a random angle for particle emission within the specified range.
		* 
		* \param min_angle Minimum emission angle in degrees.
		* \param max_angle Maximum emission angle in degrees.
		* \return Random angle in degrees.
		*/
	double generate_random_angle(double min_angle, double max_angle) const;

	/**
		* \brief Generates a random speed for particle emission within the specified range.
		* 
		* \param min_speed Minimum emission speed.
		* \param max_speed Maximum emission speed.
		* \return Random speed.
		*/
	double generate_random_speed(double min_speed, double max_speed) const;

private:
	//! Counter to count updates to determine how many times emit_particle is called.
	uint32_t update_count = 0;
	//! Determines the lowest amount of emission rate (1000 = 0.001 = 1 particle per 1000 updates).
	static constexpr uint32_t MAX_UPDATE_COUNT = 100;
};

} // namespace crepe