// Copyright 2021 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#pragma once

#include <algorithm>
#include <array>
#include <atomic>
#include <condition_variable>
#include <mutex>
#include <type_traits>

#include "common/thread_worker.h"
#include "shader_recompiler/shader_info.h"
#include "video_core/engines/maxwell_3d.h"
#include "video_core/renderer_vulkan/fixed_pipeline_state.h"
#include "video_core/renderer_vulkan/vk_buffer_cache.h"
#include "video_core/renderer_vulkan/vk_descriptor_pool.h"
#include "video_core/renderer_vulkan/vk_texture_cache.h"
#include "video_core/vulkan_common/vulkan_wrapper.h"

namespace Vulkan {

struct GraphicsPipelineCacheKey {
    std::array<u64, 6> unique_hashes;
    FixedPipelineState state;

    size_t Hash() const noexcept;

    bool operator==(const GraphicsPipelineCacheKey& rhs) const noexcept;

    bool operator!=(const GraphicsPipelineCacheKey& rhs) const noexcept {
        return !operator==(rhs);
    }

    size_t Size() const noexcept {
        return sizeof(unique_hashes) + state.Size();
    }
};
static_assert(std::has_unique_object_representations_v<GraphicsPipelineCacheKey>);
static_assert(std::is_trivially_copyable_v<GraphicsPipelineCacheKey>);
static_assert(std::is_trivially_constructible_v<GraphicsPipelineCacheKey>);

} // namespace Vulkan

namespace std {
template <>
struct hash<Vulkan::GraphicsPipelineCacheKey> {
    size_t operator()(const Vulkan::GraphicsPipelineCacheKey& k) const noexcept {
        return k.Hash();
    }
};
} // namespace std

namespace Vulkan {

class Device;
class RenderPassCache;
class VKScheduler;
class VKUpdateDescriptorQueue;

class GraphicsPipeline {
    static constexpr size_t NUM_STAGES = Tegra::Engines::Maxwell3D::Regs::MaxShaderStage;

public:
    explicit GraphicsPipeline(Tegra::Engines::Maxwell3D& maxwell3d,
                              Tegra::MemoryManager& gpu_memory, VKScheduler& scheduler,
                              BufferCache& buffer_cache, TextureCache& texture_cache,
                              const Device& device, DescriptorPool& descriptor_pool,
                              VKUpdateDescriptorQueue& update_descriptor_queue,
                              Common::ThreadWorker* worker_thread,
                              RenderPassCache& render_pass_cache,
                              const GraphicsPipelineCacheKey& key,
                              std::array<vk::ShaderModule, NUM_STAGES> stages,
                              const std::array<const Shader::Info*, NUM_STAGES>& infos);

    GraphicsPipeline& operator=(GraphicsPipeline&&) noexcept = delete;
    GraphicsPipeline(GraphicsPipeline&&) noexcept = delete;

    GraphicsPipeline& operator=(const GraphicsPipeline&) = delete;
    GraphicsPipeline(const GraphicsPipeline&) = delete;

    void AddTransition(GraphicsPipeline* transition);

    void Configure(bool is_indexed) {
        configure_func(this, is_indexed);
    }

    GraphicsPipeline* Next(const GraphicsPipelineCacheKey& current_key) noexcept {
        if (key == current_key) {
            return this;
        }
        const auto it{std::find(transition_keys.begin(), transition_keys.end(), current_key)};
        return it != transition_keys.end() ? transitions[std::distance(transition_keys.begin(), it)]
                                           : nullptr;
    }

    template <typename Spec>
    static auto MakeConfigureSpecFunc() {
        return [](GraphicsPipeline* pipeline, bool is_indexed) {
            pipeline->ConfigureImpl<Spec>(is_indexed);
        };
    }

private:
    template <typename Spec>
    void ConfigureImpl(bool is_indexed);

    void ConfigureDraw();

    void MakePipeline(VkRenderPass render_pass);

    void Validate();

    const GraphicsPipelineCacheKey key;
    Tegra::Engines::Maxwell3D& maxwell3d;
    Tegra::MemoryManager& gpu_memory;
    const Device& device;
    TextureCache& texture_cache;
    BufferCache& buffer_cache;
    VKScheduler& scheduler;
    VKUpdateDescriptorQueue& update_descriptor_queue;

    void (*configure_func)(GraphicsPipeline*, bool){};

    std::vector<GraphicsPipelineCacheKey> transition_keys;
    std::vector<GraphicsPipeline*> transitions;

    std::array<vk::ShaderModule, NUM_STAGES> spv_modules;
    std::array<Shader::Info, NUM_STAGES> stage_infos;
    vk::DescriptorSetLayout descriptor_set_layout;
    DescriptorAllocator descriptor_allocator;
    vk::PipelineLayout pipeline_layout;
    vk::DescriptorUpdateTemplateKHR descriptor_update_template;
    vk::Pipeline pipeline;

    std::condition_variable build_condvar;
    std::mutex build_mutex;
    std::atomic_bool is_built{false};
};

} // namespace Vulkan
