/* Copyright (c) 2019-2025, Arm Limited and Contributors
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Licensed under the Apache License, Version 2.0 the "License";
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#pragma once

#include "common/vk_common.h"
#include "core/buffer.h"

namespace vkb
{
namespace core
{
template <vkb::BindingType bindingType>
class Buffer;
using BufferC = Buffer<vkb::BindingType::C>;

class ImageView;
class Sampler;
}        // namespace core

/**
 * @brief A resource info is a struct containing the actual resource data.
 *
 * This will be referenced by a buffer info or image info descriptor inside a descriptor set.
 */
struct ResourceInfo
{
	bool dirty{false};

	const vkb::core::BufferC *buffer{nullptr};

	VkDeviceSize offset{0};

	VkDeviceSize range{0};

	const core::ImageView *image_view{nullptr};

	const core::Sampler *sampler{nullptr};
};

/**
 * @brief A resource set is a set of bindings containing resources that were bound
 *        by a command buffer.
 *
 * The ResourceSet has a one to one mapping with a DescriptorSet.
 */
class ResourceSet
{
  public:
	void reset();

	bool is_dirty() const;

	void clear_dirty();

	void clear_dirty(uint32_t binding, uint32_t array_element);

	void bind_buffer(const vkb::core::BufferC &buffer, VkDeviceSize offset, VkDeviceSize range, uint32_t binding, uint32_t array_element);

	void bind_image(const core::ImageView &image_view, const core::Sampler &sampler, uint32_t binding, uint32_t array_element);

	void bind_image(const core::ImageView &image_view, uint32_t binding, uint32_t array_element);

	void bind_input(const core::ImageView &image_view, uint32_t binding, uint32_t array_element);

	const BindingMap<ResourceInfo> &get_resource_bindings() const;

  private:
	bool dirty{false};

	BindingMap<ResourceInfo> resource_bindings;
};

/**
 * @brief The resource binding state of a command buffer.
 *
 * Keeps track of all the resources bound by the command buffer. The ResourceBindingState is used by
 * the command buffer to create the appropriate descriptor sets when it comes to draw.
 */
class ResourceBindingState
{
  public:
	void reset();

	bool is_dirty();

	void clear_dirty();

	void clear_dirty(uint32_t set);

	void bind_buffer(const vkb::core::BufferC &buffer, VkDeviceSize offset, VkDeviceSize range, uint32_t set, uint32_t binding, uint32_t array_element);

	void bind_image(const core::ImageView &image_view, const core::Sampler &sampler, uint32_t set, uint32_t binding, uint32_t array_element);

	void bind_image(const core::ImageView &image_view, uint32_t set, uint32_t binding, uint32_t array_element);

	void bind_input(const core::ImageView &image_view, uint32_t set, uint32_t binding, uint32_t array_element);

	const std::unordered_map<uint32_t, ResourceSet> &get_resource_sets();

  private:
	bool dirty{false};

	std::unordered_map<uint32_t, ResourceSet> resource_sets;
};
}        // namespace vkb