#pragma once


#include <cstdlib>
#include <cmath>
#include <numbers>
#include <QObject>
#include <QMutex>
#include <QElapsedTimer>
#include <bgtu/computer_graphics_lab_work/renderer_api/point.hpp>
#include <bgtu/computer_graphics_lab_work/renderer_api/sprite.hpp>
#include <bgtu/computer_graphics_lab_work/utilities/matrix.hpp>
#include <bgtu/computer_graphics_lab_work/utilities/default_renderer_linear.hpp>
#include <bgtu/computer_graphics_lab_work/utilities/zoomed_voxel_painter.hpp>


namespace BGTU::ComputerGraphicsLabWork::Impl {
	class _Lab5SpriteData_Provider;


	struct SpriteData {
	public:
		using Provider = _Lab5SpriteData_Provider;

		Utilities::Matrix4d transform;
		bool is_projection_enabled;
		double x_radius;
		double y_radius;

		explicit SpriteData(Utilities::Matrix4d transform, bool is_projection_enabled, double x_radius, double y_radius) :
				transform{transform}, is_projection_enabled{is_projection_enabled}, x_radius{x_radius}, y_radius{y_radius} {}

		[[nodiscard]] inline RendererApi::PointI<2> project_point(RendererApi::PointF<3> p) const {
			if (this->is_projection_enabled)
				return {static_cast<RendererApi::PointI<2>::component_t>((p.x - this->x_radius) / (p.z * (1 / this->x_radius) + 1) + this->x_radius), static_cast<RendererApi::PointI<2>::component_t>((p.y - this->y_radius) / (p.z * (1 / this->y_radius) + 1) + this->y_radius)};
			else
				return RendererApi::PointI<2>{static_cast<RendererApi::PointI<2>::component_t>(p.x), static_cast<RendererApi::PointI<2>::component_t>(p.y)};
		};
	};


	class _Lab5SpriteData_Provider : public QObject, public RendererApi::Sprite<SpriteData, Utilities::DefaultVoxelDrawerCache::VoxelPainterImpl>::SpriteDataProvider {
	Q_OBJECT
	private:
		QMutex sync;
		double x_angle;
		double y_angle;
		double scale;

		double x_angle_step;
		double y_angle_step;
		double scale_step;
		bool is_projection_enabled;

		RendererApi::VirtualVoxelPainter::visible_pixel_coordinate_fast_t w, h;

	public:
		explicit _Lab5SpriteData_Provider(
				double x_angle_step,
				double y_angle_step,
				double scale_step
		) : x_angle{0}, y_angle{0}, scale{1}, x_angle_step{x_angle_step}, y_angle_step{y_angle_step}, scale_step{scale_step},
			w{0}, h{0}, is_projection_enabled{false} {}

		SpriteData get_sprite_data() override {
			this->sync.lock();
			double radius = (((this->w < this->h) ? this->w : this->h) * 7 / 16.0);
			SpriteData cached{
					Utilities::Matrix4d::shift(0, 0, this->scale) * Utilities::Matrix4d::shift(this->w / 2, this->h / 2, radius * 2) * Utilities::Matrix4d::rotate_x(this->x_angle) * Utilities::Matrix4d::rotate_y(this->y_angle) * Utilities::Matrix4d::scale(radius),
					this->is_projection_enabled, this->w * 7 / 16.0,  this->h * 7 / 16.0,
			};
			this->sync.unlock();
			return cached;
		}

	public slots:

		void set_frame_size(RendererApi::VirtualVoxelPainter::visible_pixel_coordinate_fast_t ww, RendererApi::VirtualVoxelPainter::visible_pixel_coordinate_fast_t hh) {
			this->sync.lock();
			this->w = ww;
			this->h = hh;
			this->sync.unlock();
		}

		void inc_x_angle() {
			this->sync.lock();
			this->x_angle += this->x_angle_step;
			this->sync.unlock();
		}

		void dec_x_angle() {
			this->sync.lock();
			this->x_angle -= this->x_angle_step;
			this->sync.unlock();
		}

		void inc_y_angle() {
			this->sync.lock();
			this->y_angle += this->y_angle_step;
			this->sync.unlock();
		}

		void dec_y_angle() {
			this->sync.lock();
			this->y_angle -= this->y_angle_step;
			this->sync.unlock();
		}

		void inc_scale() {
			this->sync.lock();
			this->scale += this->scale_step;
			this->sync.unlock();
		}

		void dec_scale() {
			this->sync.lock();
			this->scale -= this->scale_step;
			this->sync.unlock();
		}

		void switch_projection() {
			this->sync.lock();
			this->is_projection_enabled = !this->is_projection_enabled;
			this->sync.unlock();
		}
	};
}