#include "Geometry.h"
#include "../../Include/RmlUi/Core/Context.h"
#include "../../Include/RmlUi/Core/Core.h"
#include "../../Include/RmlUi/Core/Geometry.h"
#include "../../Include/RmlUi/Core/MeshUtilities.h"
#include "../../Include/RmlUi/Core/RenderManager.h"

namespace Rml {
namespace Debugger {

static Context* g_context = nullptr;
static RenderManager* g_render_manager = nullptr;

Geometry::Geometry() {}

void Geometry::SetContext(Context* context)
{
	g_context = context;
	g_render_manager = context ? &context->GetRenderManager() : nullptr;
}

void Geometry::RenderOutline(const Vector2f origin, const Vector2f dimensions, const Colourb colour, float width)
{
	if (!g_context || !g_render_manager)
		return;

	Mesh mesh;
	mesh.vertices.reserve(4 * 4);
	mesh.indices.reserve(6 * 4);

	ColourbPremultiplied colour_pre = colour.ToPremultiplied();

	MeshUtilities::GenerateQuad(mesh, Vector2f(0, 0), Vector2f(dimensions.x, width), colour_pre);
	MeshUtilities::GenerateQuad(mesh, Vector2f(0, dimensions.y - width), Vector2f(dimensions.x, width), colour_pre);
	MeshUtilities::GenerateQuad(mesh, Vector2f(0, 0), Vector2f(width, dimensions.y), colour_pre);
	MeshUtilities::GenerateQuad(mesh, Vector2f(dimensions.x - width, 0), Vector2f(width, dimensions.y), colour_pre);

	g_render_manager->MakeGeometry(std::move(mesh)).Render(origin);
}

void Geometry::RenderBox(const Vector2f origin, const Vector2f dimensions, const Colourb colour)
{
	if (!g_context || !g_render_manager)
		return;

	Mesh mesh;
	MeshUtilities::GenerateQuad(mesh, Vector2f(0, 0), Vector2f(dimensions.x, dimensions.y), colour.ToPremultiplied());

	g_render_manager->MakeGeometry(std::move(mesh)).Render(origin);
}

void Geometry::RenderBox(const Vector2f origin, const Vector2f dimensions, const Vector2f hole_origin, const Vector2f hole_dimensions,
	const Colourb colour)
{
	// Top box.
	float top_y_dimensions = hole_origin.y - origin.y;
	if (top_y_dimensions > 0)
	{
		RenderBox(origin, Vector2f(dimensions.x, top_y_dimensions), colour);
	}

	// Bottom box.
	float bottom_y_dimensions = (origin.y + dimensions.y) - (hole_origin.y + hole_dimensions.y);
	if (bottom_y_dimensions > 0)
	{
		RenderBox(Vector2f(origin.x, hole_origin.y + hole_dimensions.y), Vector2f(dimensions.x, bottom_y_dimensions), colour);
	}

	// Left box.
	float left_x_dimensions = hole_origin.x - origin.x;
	if (left_x_dimensions > 0)
	{
		RenderBox(Vector2f(origin.x, hole_origin.y), Vector2f(left_x_dimensions, hole_dimensions.y), colour);
	}

	// Right box.
	float right_x_dimensions = (origin.x + dimensions.x) - (hole_origin.x + hole_dimensions.x);
	if (right_x_dimensions > 0)
	{
		RenderBox(Vector2f(hole_origin.x + hole_dimensions.x, hole_origin.y), Vector2f(right_x_dimensions, hole_dimensions.y), colour);
	}
}

} // namespace Debugger
} // namespace Rml