#include <engine.h>
#include <rlgl.h>
#include <raymath.h>
//#define RAYGUI_IMPLEMENTATION
//#include <raygui.h>

RenderCtx ctx;

/*
	Audio
	Video
	Gameplay
	Control
	Accessibility
	Filter
*/
void	RenderOption() {

}

void	RenderInventory() {
	//DrawTextureRec();
}

void	DebugInterface() {
	DrawFPS(10, 10);
}

void	UserInterface() {
}



void	MainMenu() {
	int current_state;
	switch (current_state) {
		case(0): {
			break;
		}
		default:
			break;
	}
}

void	LoadCameraMode(int mode) {
	switch (mode) {
		case(0): {
			break;
		}
		default:
			break;
	}
}

void	LoadPipeline() {
	ctx.width = 800;
	ctx.height = 480;

	ctx.hud_on = true;
	ctx.debug_on = true;
	InitWindow(ctx.width, ctx.height, "GAME!!");
	assert(IsWindowReady());
	ctx.window = GetWindowHandle();
	
	ctx.shader.deferred = LoadShader("source/shader/deferred.vs", "source/shader/deferred.fs");
	ctx.shader.gbuffer = LoadShader("source/shader/gbuffer.vs", "source/shader/gbuffer.fs");
	ctx.shader.filter = LoadShader("", "source/shader/Screen_filter.fs");

	ctx.gbuffer.framebufferId = rlLoadFramebuffer();
	assert(ctx.gbuffer.framebufferId);

	rlEnableFramebuffer(ctx.gbuffer.framebufferId);
	ctx.gbuffer.depth_tex_id = rlLoadTextureDepth(ctx.width, ctx.height, false);
	// If Artefact appear on Normal, may need to change to RL_PIXELFORMAT_UNCOMPRESSED_R32G32B32
	ctx.gbuffer.normal_tex_id = rlLoadTexture(NULL, ctx.width, ctx.height, RL_PIXELFORMAT_UNCOMPRESSED_R16G16B16, 1);
    // The color in RGB, and the specular strength in the alpha channel
	ctx.gbuffer.albedoSpec_tex_id = rlLoadTexture(NULL, ctx.width, ctx.height, RL_PIXELFORMAT_UNCOMPRESSED_R8G8B8A8, 1);
	rlActiveDrawBuffers(3);

	rlFramebufferAttach(ctx.gbuffer.framebufferId, ctx.gbuffer.depth_tex_id, RL_ATTACHMENT_DEPTH, RL_ATTACHMENT_TEXTURE2D, 0);
	rlFramebufferAttach(ctx.gbuffer.framebufferId, ctx.gbuffer.normal_tex_id, RL_ATTACHMENT_COLOR_CHANNEL0, RL_ATTACHMENT_TEXTURE2D, 0);
	rlFramebufferAttach(ctx.gbuffer.framebufferId, ctx.gbuffer.albedoSpec_tex_id, RL_ATTACHMENT_COLOR_CHANNEL1, RL_ATTACHMENT_TEXTURE2D, 0);
	assert(rlFramebufferComplete(ctx.gbuffer.framebufferId));

	rlEnableShader(ctx.shader.deferred.id);
    int texUnitDepth = 0;
    int texUnitNormal = 1;
    int texUnitAlbedoSpec = 2;
    SetShaderValue(ctx.shader.deferred, rlGetLocationUniform(ctx.shader.deferred.id, "gDepth"), &texUnitDepth, RL_SHADER_UNIFORM_SAMPLER2D);
    SetShaderValue(ctx.shader.deferred, rlGetLocationUniform(ctx.shader.deferred.id, "gNormal"), &texUnitNormal, RL_SHADER_UNIFORM_SAMPLER2D);
    SetShaderValue(ctx.shader.deferred, rlGetLocationUniform(ctx.shader.deferred.id, "gAlbedoSpec"), &texUnitAlbedoSpec, RL_SHADER_UNIFORM_SAMPLER2D);
    rlDisableShader();
	//now need to set this to things that use this Material, and add light used in the scene.

	rlEnableDepthTest();
	rlEnableBackfaceCulling();
	TraceLog(LOG_INFO, "Render Pipeline Built");
	SetTargetFPS(120);//may change
}

void	UnloadPipeline() {
	rlUnloadFramebuffer(ctx.gbuffer.framebufferId);
	rlUnloadTexture(ctx.gbuffer.depth_tex_id);
	rlUnloadTexture(ctx.gbuffer.normal_tex_id);
	rlUnloadTexture(ctx.gbuffer.albedoSpec_tex_id);
	UnloadShader(ctx.shader.deferred);
	UnloadShader(ctx.shader.gbuffer);
	UnloadShader(ctx.shader.filter);
	CloseWindow();
}


void	Rendering() {
	BeginDrawing();
	ClearBackground(BLACK);
	rlEnableDepthMask();
	rlEnableFramebuffer(ctx.gbuffer.framebufferId);
	rlEnableShader(ctx.shader.gbuffer.id);
	BeginMode3D(ctx.camera);
	//MainGeamoetry;
	EndMode3D();
	rlDisableShader();
	rlDisableFramebuffer();
	rlDisableDepthMask();//may not be usefull
	//rlDisableDepthTest();

	//Light Pass and forward pass;
	//I should build a shader that take every light in the scene and make a 3D heightmap of lighting then compute it once for all static light allowing to cheat computing everylight
	//light is computed into a scalar field

	//Light Pass

	//Screen Filter Pass
	BeginShaderMode(ctx.shader.filter);//may be good to have this disabled for accessibility
	//DrawTextureRec();
	EndShaderMode();

	//render ui
	EndDrawing();
}

void	LoadAssets() {
	//Font
	//Textures
	//Models
	//Sound
	//Data
	TraceLog(LOG_INFO, "Assets Loaded");
}

void	UnloadAssets() {

}