#include <netools.h>
#include <pci.h>
#include <io.h>

#include "../../../Kernel/DAPI.hpp"
#include "../../../Kernel/Fex.hpp"

extern "C" int DriverEntry(void *Data);
int CallbackHandler(KernelCallback *Data);

HEAD(FexFormatType_Driver, FexOSType_Fennix, DriverEntry);

#pragma GCC diagnostic ignored "-Wmissing-field-initializers"

__attribute__((section(".extended"))) FexExtended ExtendedHeader = {
    .Driver = {
        .Name = "Virtio Network",
        .Type = FexDriverType_Network,
        .Callback = CallbackHandler,
        .Bind = {
            .Type = BIND_PCI,
            .PCI = {
                .VendorID = {0x1AF4},
                .DeviceID = {0x1000},
                .Class = 0x2,
                .SubClass = 0x0,
                .ProgIF = 0x0,
            }}}};

KernelAPI *KAPI;

#define print(msg) KAPI->Util.DebugPrint((char *)(msg), KAPI->Info.DriverUID)

/* --------------------------------------------------------------------------------------------------------- */

struct BARData
{
    uint8_t Type;
    uint64_t IOBase;
    uint64_t MemoryBase;
};

PCIDeviceHeader *PCIBaseAddress;
BARData BAR;

MediaAccessControl MAC;
InternetProtocol4 IP;

int DriverEntry(void *Data)
{
    if (!Data)
        return INVALID_KERNEL_API;
    KAPI = (KernelAPI *)Data;
    if (KAPI->Version.Major < 0 || KAPI->Version.Minor < 0 || KAPI->Version.Patch < 0)
        return KERNEL_API_VERSION_NOT_SUPPORTED;
    return OK;
}

int CallbackHandler(KernelCallback *Data)
{
    switch (Data->Reason)
    {
    case AcknowledgeReason:
    {
        print("Kernel acknowledged the driver.");
        break;
    }
    case ConfigurationReason:
    {
        print("Kernel received configuration data.");
        PCIBaseAddress = reinterpret_cast<PCIDeviceHeader *>(Data->RawPtr);
        if (PCIBaseAddress->VendorID == 0x1AF4 && PCIBaseAddress->DeviceID == 0x1000)
        {
            print("Found Virtio Network.");
            return NOT_IMPLEMENTED;
        }
        else
            return DEVICE_NOT_SUPPORTED;
        break;
    }
    case InterruptReason:
    {
        break;
    }
    case SendReason:
    {
        break;
    }
    case StopReason:
    {
        // TODO: Stop the driver.
        print("Driver stopped.");
        break;
    }
    default:
    {
        print("Unknown reason.");
        break;
    }
    }
    return OK;
}