#pragma once

#include <memory>
#include "gfx/shader.hpp"
#include "game/world.hpp"
#include "game/sector.hpp"

namespace gfx
{
	struct DrawSectorParams
	{
		const game::Sector* sector;
		const game::Portal* entry_portal;
		glm::vec4 clip_plane;
		collision::AABB2 screen_aabb;
		size_t recursion;
		glm::mat4 view;
		glm::mat4 view_proj;
		glm::vec3 eye;
	};

	class Renderer
	{
	public:
		Renderer();

		void Begin(size_t width, size_t height);

		void DrawWorld(
			const game::World& world,
			size_t sector_idx,
			const glm::vec3& eye,
			const glm::vec3& dir,
			const glm::vec3& up,
			float aspect,
			float fov);

	private:
		std::unique_ptr<Shader> sector_shader_;
		std::unique_ptr<Shader> portal_shader_;

		std::shared_ptr<VertexArray> portal_vao_;
		void SetupPortalVAO();

		glm::mat4 proj_;

		void DrawSector(const DrawSectorParams& params);
		void DrawPortal(const DrawSectorParams& params, const game::Portal& portal);
		
		static bool ComputePortalScreenAABB(const game::Portal& portal, const glm::mat4 view_proj, collision::AABB2& aabb);
		void DrawPortalPlane(const DrawSectorParams& params, const game::Portal& portal, bool clear_depth);
	};

}