#include "gpu.h"
#include "common/io.h"

#include <private/drivers/poke.h>

const char* ffDetectGPUImpl(FF_A_UNUSED const FFGPUOptions* options, FFlist* gpus) {
    FF_AUTO_CLOSE_FD int pokefd = open(POKE_DEVICE_FULLNAME, O_RDWR | O_CLOEXEC);
    if (pokefd < 0) {
        return "open(POKE_DEVICE_FULLNAME) failed";
    }

    pci_info dev;
    pci_info_args cmd = {
        .signature = POKE_SIGNATURE,
        .info = &dev,
    };

    for (cmd.index = 0; ioctl(pokefd, POKE_GET_NTH_PCI_INFO, &cmd, sizeof(cmd)) == B_OK && cmd.status == B_OK; ++cmd.index) {
        if (dev.class_base != 0x03 /*PCI_BASE_CLASS_DISPLAY*/) {
            continue;
        }

        if (dev.function > 0 && dev.class_sub == 0x80 /*PCI_CLASS_DISPLAY_OTHER*/) {
            continue; // Likely an auxiliary display controller (#2034)
        }

        FFGPUResult* gpu = FF_LIST_ADD(FFGPUResult, *gpus);
        ffStrbufInitStatic(&gpu->vendor, ffGPUGetVendorString(dev.vendor_id));
        ffStrbufInit(&gpu->name);
        ffStrbufInit(&gpu->driver);
        ffStrbufInitStatic(&gpu->platformApi, POKE_DEVICE_FULLNAME);
        ffStrbufInit(&gpu->memoryType);
        gpu->temperature = FF_GPU_TEMP_UNSET;
        gpu->coreCount = FF_GPU_CORE_COUNT_UNSET;
        gpu->coreUsage = FF_GPU_CORE_USAGE_UNSET;
        gpu->type = FF_GPU_TYPE_UNKNOWN;
        gpu->dedicated.total = gpu->dedicated.used = gpu->shared.total = gpu->shared.used = FF_GPU_VMEM_SIZE_UNSET;
        gpu->deviceId = ffGPUPciAddr2Id(0, dev.bus, dev.device, dev.function);
        gpu->frequency = FF_GPU_FREQUENCY_UNSET;

        if (gpu->vendor.chars == FF_GPU_VENDOR_NAME_AMD) {
            ffGPUQueryAmdGpuName(dev.device_id, dev.revision, gpu);
        }

        if (gpu->name.length == 0) {
            ffGPUFillVendorAndName(dev.class_sub, dev.vendor_id, dev.device_id, gpu);
        }
    }

    return NULL;
}
