// Copyright 2018 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#include <algorithm>
#include <array>
#include <cstring>
#include <memory>
#include <optional>
#include <string>
#include <vector>

#include <fmt/format.h>

#include "common/logging/log.h"
#include "common/settings.h"
#include "common/telemetry.h"
#include "core/core.h"
#include "core/core_timing.h"
#include "core/frontend/emu_window.h"
#include "core/telemetry_session.h"
#include "video_core/gpu.h"
#include "video_core/renderer_vulkan/renderer_vulkan.h"
#include "video_core/renderer_vulkan/vk_blit_screen.h"
#include "video_core/renderer_vulkan/vk_master_semaphore.h"
#include "video_core/renderer_vulkan/vk_rasterizer.h"
#include "video_core/renderer_vulkan/vk_scheduler.h"
#include "video_core/renderer_vulkan/vk_state_tracker.h"
#include "video_core/renderer_vulkan/vk_swapchain.h"
#include "video_core/vulkan_common/vulkan_debug_callback.h"
#include "video_core/vulkan_common/vulkan_device.h"
#include "video_core/vulkan_common/vulkan_instance.h"
#include "video_core/vulkan_common/vulkan_library.h"
#include "video_core/vulkan_common/vulkan_memory_allocator.h"
#include "video_core/vulkan_common/vulkan_surface.h"
#include "video_core/vulkan_common/vulkan_wrapper.h"

namespace Vulkan {
namespace {
std::string GetReadableVersion(u32 version) {
    return fmt::format("{}.{}.{}", VK_VERSION_MAJOR(version), VK_VERSION_MINOR(version),
                       VK_VERSION_PATCH(version));
}

std::string GetDriverVersion(const Device& device) {
    // Extracted from
    // https://github.com/SaschaWillems/vulkan.gpuinfo.org/blob/5dddea46ea1120b0df14eef8f15ff8e318e35462/functions.php#L308-L314
    const u32 version = device.GetDriverVersion();

    if (device.GetDriverID() == VK_DRIVER_ID_NVIDIA_PROPRIETARY_KHR) {
        const u32 major = (version >> 22) & 0x3ff;
        const u32 minor = (version >> 14) & 0x0ff;
        const u32 secondary = (version >> 6) & 0x0ff;
        const u32 tertiary = version & 0x003f;
        return fmt::format("{}.{}.{}.{}", major, minor, secondary, tertiary);
    }
    if (device.GetDriverID() == VK_DRIVER_ID_INTEL_PROPRIETARY_WINDOWS_KHR) {
        const u32 major = version >> 14;
        const u32 minor = version & 0x3fff;
        return fmt::format("{}.{}", major, minor);
    }
    return GetReadableVersion(version);
}

std::string BuildCommaSeparatedExtensions(std::vector<std::string> available_extensions) {
    std::sort(std::begin(available_extensions), std::end(available_extensions));

    static constexpr std::size_t AverageExtensionSize = 64;
    std::string separated_extensions;
    separated_extensions.reserve(available_extensions.size() * AverageExtensionSize);

    const auto end = std::end(available_extensions);
    for (auto extension = std::begin(available_extensions); extension != end; ++extension) {
        if (const bool is_last = extension + 1 == end; is_last) {
            separated_extensions += *extension;
        } else {
            separated_extensions += fmt::format("{},", *extension);
        }
    }
    return separated_extensions;
}

Device CreateDevice(const vk::Instance& instance, const vk::InstanceDispatch& dld,
                    VkSurfaceKHR surface) {
    const std::vector<VkPhysicalDevice> devices = instance.EnumeratePhysicalDevices();
    const s32 device_index = Settings::values.vulkan_device.GetValue();
    if (device_index < 0 || device_index >= static_cast<s32>(devices.size())) {
        LOG_ERROR(Render_Vulkan, "Invalid device index {}!", device_index);
        throw vk::Exception(VK_ERROR_INITIALIZATION_FAILED);
    }
    const vk::PhysicalDevice physical_device(devices[device_index], dld);
    return Device(*instance, physical_device, surface, dld);
}
} // Anonymous namespace

RendererVulkan::RendererVulkan(Core::TelemetrySession& telemetry_session_,
                               Core::Frontend::EmuWindow& emu_window,
                               Core::Memory::Memory& cpu_memory_, Tegra::GPU& gpu_,
                               std::unique_ptr<Core::Frontend::GraphicsContext> context_) try
    : RendererBase(emu_window, std::move(context_)), telemetry_session(telemetry_session_),
      cpu_memory(cpu_memory_), gpu(gpu_), library(OpenLibrary()),
      instance(CreateInstance(library, dld, VK_API_VERSION_1_1, render_window.GetWindowInfo().type,
                              true, Settings::values.renderer_debug.GetValue())),
      debug_callback(Settings::values.renderer_debug ? CreateDebugCallback(instance) : nullptr),
      surface(CreateSurface(instance, render_window)),
      device(CreateDevice(instance, dld, *surface)), memory_allocator(device, false),
      state_tracker(gpu), scheduler(device, state_tracker),
      swapchain(*surface, device, scheduler, render_window.GetFramebufferLayout().width,
                render_window.GetFramebufferLayout().height, false),
      blit_screen(cpu_memory, render_window, device, memory_allocator, swapchain, scheduler,
                  screen_info),
      rasterizer(render_window, gpu, gpu.MemoryManager(), cpu_memory, screen_info, device,
                 memory_allocator, state_tracker, scheduler) {
    Report();
} catch (const vk::Exception& exception) {
    LOG_ERROR(Render_Vulkan, "Vulkan initialization failed with error: {}", exception.what());
    throw std::runtime_error{fmt::format("Vulkan initialization error {}", exception.what())};
}

RendererVulkan::~RendererVulkan() {
    void(device.GetLogical().WaitIdle());
}

void RendererVulkan::SwapBuffers(const Tegra::FramebufferConfig* framebuffer) {
    if (!framebuffer) {
        return;
    }
    SCOPE_EXIT({ render_window.OnFrameDisplayed(); });
    if (!render_window.IsShown()) {
        return;
    }
    const VAddr framebuffer_addr = framebuffer->address + framebuffer->offset;
    const bool use_accelerated =
        rasterizer.AccelerateDisplay(*framebuffer, framebuffer_addr, framebuffer->stride);
    const bool is_srgb = use_accelerated && screen_info.is_srgb;

    const Layout::FramebufferLayout layout = render_window.GetFramebufferLayout();
    bool has_been_recreated = false;
    const auto recreate_swapchain = [&] {
        if (!has_been_recreated) {
            has_been_recreated = true;
            scheduler.WaitWorker();
        }
        swapchain.Create(layout.width, layout.height, is_srgb);
    };
    if (swapchain.NeedsRecreate() ||
        swapchain.HasDifferentLayout(layout.width, layout.height, is_srgb)) {
        recreate_swapchain();
    }
    bool needs_recreate;
    do {
        needs_recreate = false;
        swapchain.AcquireNextImage();
        if (swapchain.NeedsRecreate()) {
            recreate_swapchain();
            needs_recreate = true;
        }
    } while (needs_recreate);
    if (has_been_recreated) {
        blit_screen.Recreate();
    }
    const VkSemaphore render_semaphore = blit_screen.Draw(*framebuffer, use_accelerated);
    scheduler.Flush(render_semaphore);
    scheduler.WaitWorker();
    swapchain.Present(render_semaphore);

    gpu.RendererFrameEndNotify();
    rasterizer.TickFrame();
}

void RendererVulkan::Report() const {
    const std::string vendor_name{device.GetVendorName()};
    const std::string model_name{device.GetModelName()};
    const std::string driver_version = GetDriverVersion(device);
    const std::string driver_name = fmt::format("{} {}", vendor_name, driver_version);

    const std::string api_version = GetReadableVersion(device.ApiVersion());

    const std::string extensions = BuildCommaSeparatedExtensions(device.GetAvailableExtensions());

    LOG_INFO(Render_Vulkan, "Driver: {}", driver_name);
    LOG_INFO(Render_Vulkan, "Device: {}", model_name);
    LOG_INFO(Render_Vulkan, "Vulkan: {}", api_version);

    static constexpr auto field = Common::Telemetry::FieldType::UserSystem;
    telemetry_session.AddField(field, "GPU_Vendor", vendor_name);
    telemetry_session.AddField(field, "GPU_Model", model_name);
    telemetry_session.AddField(field, "GPU_Vulkan_Driver", driver_name);
    telemetry_session.AddField(field, "GPU_Vulkan_Version", api_version);
    telemetry_session.AddField(field, "GPU_Vulkan_Extensions", extensions);
}

} // namespace Vulkan