//
// Copyright 2017 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//

// SystemInfo_mac.cpp: implementation of the Mac-specific parts of SystemInfo.h

#include "gpu_info_util/SystemInfo_internal.h"

#import <Cocoa/Cocoa.h>
#import <IOKit/IOKitLib.h>

namespace angle
{

namespace
{

std::string GetMachineModel()
{
    io_service_t platformExpert = IOServiceGetMatchingService(
        kIOMasterPortDefault, IOServiceMatching("IOPlatformExpertDevice"));

    if (platformExpert == IO_OBJECT_NULL)
    {
        return "";
    }

    CFDataRef modelData = static_cast<CFDataRef>(
        IORegistryEntryCreateCFProperty(platformExpert, CFSTR("model"), kCFAllocatorDefault, 0));
    if (modelData == nullptr)
    {
        IOObjectRelease(platformExpert);
        return "";
    }

    std::string result = reinterpret_cast<const char *>(CFDataGetBytePtr(modelData));

    IOObjectRelease(platformExpert);
    CFRelease(modelData);

    return result;
}

// Extracts one integer property from a registry entry.
bool GetEntryProperty(io_registry_entry_t entry, CFStringRef name, uint32_t *value)
{
    *value = 0;

    CFDataRef data = static_cast<CFDataRef>(
        IORegistryEntrySearchCFProperty(entry, kIOServicePlane, name, kCFAllocatorDefault,
                                        kIORegistryIterateRecursively | kIORegistryIterateParents));

    if (data == nullptr)
    {
        return false;
    }

    const uint32_t *valuePtr = reinterpret_cast<const uint32_t *>(CFDataGetBytePtr(data));

    if (valuePtr == nullptr)
    {
        CFRelease(data);
        return false;
    }

    *value = *valuePtr;
    CFRelease(data);
    return true;
}

// Gathers the vendor and device IDs for the PCI GPUs
bool GetPCIDevices(std::vector<GPUDeviceInfo> *devices)
{
    // matchDictionary will be consumed by IOServiceGetMatchingServices, no need to release it.
    CFMutableDictionaryRef matchDictionary = IOServiceMatching("IOPCIDevice");

    io_iterator_t entryIterator;
    if (IOServiceGetMatchingServices(kIOMasterPortDefault, matchDictionary, &entryIterator) !=
        kIOReturnSuccess)
    {
        return false;
    }

    io_registry_entry_t entry = IO_OBJECT_NULL;

    while ((entry = IOIteratorNext(entryIterator)) != IO_OBJECT_NULL)
    {
        constexpr uint32_t kClassCodeDisplayVGA = 0x30000;
        uint32_t classCode;
        GPUDeviceInfo info;

        if (GetEntryProperty(entry, CFSTR("class-code"), &classCode) &&
            classCode == kClassCodeDisplayVGA &&
            GetEntryProperty(entry, CFSTR("vendor-id"), &info.vendorId) &&
            GetEntryProperty(entry, CFSTR("device-id"), &info.deviceId))
        {
            devices->push_back(info);
        }

        IOObjectRelease(entry);
    }
    IOObjectRelease(entryIterator);

    return true;
}

}  // anonymous namespace

bool GetSystemInfo(SystemInfo *info)
{
    {
        int32_t major = 0;
        int32_t minor = 0;
        ParseMacMachineModel(GetMachineModel(), &info->machineModelName, &major, &minor);
        info->machineModelVersion = std::to_string(major) + "." + std::to_string(minor);
    }

    if (!GetPCIDevices(&(info->gpus)))
    {
        return false;
    }

    if (info->gpus.empty())
    {
        return false;
    }

    FindActiveGPU(info);

    // Figure out whether this is a dual-GPU system.
    //
    // TODO(kbr): this code was ported over from Chromium, and its correctness
    // could be improved - need to use Mac-specific APIs to determine whether
    // offline renderers are allowed, and whether these two GPUs are really the
    // integrated/discrete GPUs in a laptop.
    if (info->gpus.size() == 2 &&
        ((IsIntel(info->gpus[0].vendorId) && !IsIntel(info->gpus[1].vendorId)) ||
         (!IsIntel(info->gpus[0].vendorId) && IsIntel(info->gpus[1].vendorId))))
    {
        info->isMacSwitchable = true;
    }

    return true;
}

}  // namespace angle
