/*
 * X11DRV display device functions
 *
 * Copyright 2019 Zhiyi Zhang for CodeWeavers
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

#include "config.h"

#include <stdarg.h>

#include "windef.h"
#include "winbase.h"
#include "winuser.h"
#include "rpc.h"
#include "winreg.h"
#include "initguid.h"
#include "devguid.h"
#include "devpkey.h"
#include "setupapi.h"
#define WIN32_NO_STATUS
#include "winternl.h"
#include "wine/debug.h"
#include "wine/unicode.h"
#include "x11drv.h"

WINE_DEFAULT_DEBUG_CHANNEL(x11drv);

/* Wine specific monitor properties */
DEFINE_DEVPROPKEY(WINE_DEVPROPKEY_MONITOR_STATEFLAGS, 0x233a9ef3, 0xafc4, 0x4abd, 0xb5, 0x64, 0xc3, 0x2f, 0x21, 0xf1, 0x53, 0x5b, 2);

static const WCHAR driver_descW[] = {'D','r','i','v','e','r','D','e','s','c',0};
static const WCHAR video_idW[] = {'V','i','d','e','o','I','D',0};
static const WCHAR symbolic_link_valueW[]= {'S','y','m','b','o','l','i','c','L','i','n','k','V','a','l','u','e',0};
static const WCHAR gpu_idW[] = {'G','P','U','I','D',0};
static const WCHAR mointor_id_fmtW[] = {'M','o','n','i','t','o','r','I','D','%','d',0};
static const WCHAR state_flagsW[] = {'S','t','a','t','e','F','l','a','g','s',0};
static const WCHAR guid_fmtW[] = {
    '{','%','0','8','x','-','%','0','4','x','-','%','0','4','x','-','%','0','2','x','%','0','2','x','-',
    '%','0','2','x','%','0','2','x','%','0','2','x','%','0','2','x','%','0','2','x','%','0','2','x','}',0};
static const WCHAR gpu_instance_fmtW[] = {
    'P','C','I','\\',
    'V','E','N','_','%','0','4','X','&',
    'D','E','V','_','%','0','4','X','&',
    'S','U','B','S','Y','S','_','%','0','8','X','&',
    'R','E','V','_','%','0','2','X','\\',
    '%','0','8','X',0};
static const WCHAR gpu_hardware_id_fmtW[] = {
    'P','C','I','\\',
    'V','E','N','_','%','0','4','X','&',
    'D','E','V','_','%','0','4','X','&',
    'S','U','B','S','Y','S','_','0','0','0','0','0','0','0','0','&',
    'R','E','V','_','0','0',0};
static const WCHAR video_keyW[] = {
    'H','A','R','D','W','A','R','E','\\',
    'D','E','V','I','C','E','M','A','P','\\',
    'V','I','D','E','O',0};
static const WCHAR adapter_key_fmtW[] = {
    'S','y','s','t','e','m','\\',
    'C','u','r','r','e','n','t','C','o','n','t','r','o','l','S','e','t','\\',
    'C','o','n','t','r','o','l','\\',
    'V','i','d','e','o','\\',
    '%','s','\\',
    '%','0','4','x',0};
static const WCHAR device_video_fmtW[] = {
    '\\','D','e','v','i','c','e','\\',
    'V','i','d','e','o','%','d',0};
static const WCHAR machine_prefixW[] = {
    '\\','R','e','g','i','s','t','r','y','\\',
    'M','a','c','h','i','n','e','\\',0};
static const WCHAR nt_classW[] = {
    '\\','R','e','g','i','s','t','r','y','\\',
    'M','a','c','h','i','n','e','\\',
    'S','y','s','t','e','m','\\',
    'C','u','r','r','e','n','t','C','o','n','t','r','o','l','S','e','t','\\',
    'C','o','n','t','r','o','l','\\',
    'C','l','a','s','s','\\',0};
static const WCHAR monitor_instance_fmtW[] = {
    'D','I','S','P','L','A','Y','\\',
    'D','e','f','a','u','l','t','_','M','o','n','i','t','o','r','\\',
    '%','0','4','X','&','%','0','4','X',0};
static const WCHAR monitor_hardware_idW[] = {
    'M','O','N','I','T','O','R','\\',
    'D','e','f','a','u','l','t','_','M','o','n','i','t','o','r',0,0};

static struct x11drv_display_device_handler handler;

void X11DRV_DisplayDevices_SetHandler(const struct x11drv_display_device_handler *new_handler)
{
    if (new_handler->priority > handler.priority)
    {
        handler = *new_handler;
        TRACE("Display device functions are now handled by: %s\n", handler.name);
    }
}

/* Initialize a GPU instance and return its GUID string in guid_string and driver value in driver parameter */
static BOOL X11DRV_InitGpu(HDEVINFO devinfo, const struct x11drv_gpu *gpu, INT gpu_index, WCHAR *guid_string,
                           WCHAR *driver)
{
    static const BOOL present = TRUE;
    SP_DEVINFO_DATA device_data = {sizeof(device_data)};
    WCHAR instanceW[MAX_PATH];
    WCHAR bufferW[1024];
    HKEY hkey = NULL;
    GUID guid;
    INT written;
    DWORD size;
    BOOL ret = FALSE;

    sprintfW(instanceW, gpu_instance_fmtW, gpu->vendor_id, gpu->device_id, gpu->subsys_id, gpu->revision_id, gpu_index);
    if (!SetupDiOpenDeviceInfoW(devinfo, instanceW, NULL, 0, &device_data))
    {
        SetupDiCreateDeviceInfoW(devinfo, instanceW, &GUID_DEVCLASS_DISPLAY, gpu->name, NULL, 0, &device_data);
        if (!SetupDiRegisterDeviceInfo(devinfo, &device_data, 0, NULL, NULL, NULL))
            goto done;
    }

    /* Write HardwareID registry property, REG_MULTI_SZ */
    written = sprintfW(bufferW, gpu_hardware_id_fmtW, gpu->vendor_id, gpu->device_id);
    bufferW[written + 1] = 0;
    if (!SetupDiSetDeviceRegistryPropertyW(devinfo, &device_data, SPDRP_HARDWAREID, (const BYTE *)bufferW,
                                           (written + 2) * sizeof(WCHAR)))
        goto done;

    /* Write DEVPKEY_Device_IsPresent property */
    if (!SetupDiSetDevicePropertyW(devinfo, &device_data, &DEVPKEY_Device_IsPresent, DEVPROP_TYPE_BOOLEAN,
                                   (const BYTE *)&present, sizeof(present), 0))
        goto done;

    /* Open driver key.
     * This is where HKLM\System\CurrentControlSet\Control\Video\{GPU GUID}\{Adapter Index} links to */
    hkey = SetupDiCreateDevRegKeyW(devinfo, &device_data, DICS_FLAG_GLOBAL, 0, DIREG_DRV, NULL, NULL);

    /* Write DriverDesc value */
    if (RegSetValueExW(hkey, driver_descW, 0, REG_SZ, (const BYTE *)gpu->name,
                       (strlenW(gpu->name) + 1) * sizeof(WCHAR)))
        goto done;
    RegCloseKey(hkey);

    /* Retrieve driver value for adapters */
    if (!SetupDiGetDeviceRegistryPropertyW(devinfo, &device_data, SPDRP_DRIVER, NULL, (BYTE *)bufferW, sizeof(bufferW),
                                           NULL))
        goto done;
    lstrcpyW(driver, nt_classW);
    lstrcatW(driver, bufferW);

    /* Write GUID in VideoID in .../instance/Device Parameters, reuse the GUID if it's existent */
    hkey = SetupDiCreateDevRegKeyW(devinfo, &device_data, DICS_FLAG_GLOBAL, 0, DIREG_DEV, NULL, NULL);

    size = sizeof(bufferW);
    if (RegQueryValueExW(hkey, video_idW, 0, NULL, (BYTE *)bufferW, &size))
    {
        UuidCreate(&guid);
        sprintfW(bufferW, guid_fmtW, guid.Data1, guid.Data2, guid.Data3, guid.Data4[0], guid.Data4[1], guid.Data4[2],
                 guid.Data4[3], guid.Data4[4], guid.Data4[5], guid.Data4[6], guid.Data4[7]);
        if (RegSetValueExW(hkey, video_idW, 0, REG_SZ, (const BYTE *)bufferW, (strlenW(bufferW) + 1) * sizeof(WCHAR)))
            goto done;
    }
    lstrcpyW(guid_string, bufferW);

    ret = TRUE;
done:
    RegCloseKey(hkey);
    if (!ret)
        ERR("Failed to initialize GPU\n");
    return ret;
}

static BOOL X11DRV_InitAdapter(HKEY video_hkey, INT video_index, INT gpu_index, INT adapter_index, INT monitor_count,
                               const struct x11drv_gpu *gpu, const WCHAR *guid_string,
                               const WCHAR *gpu_driver, const struct x11drv_adapter *adapter)
{
    WCHAR adapter_keyW[MAX_PATH];
    WCHAR key_nameW[MAX_PATH];
    WCHAR bufferW[1024];
    HKEY hkey = NULL;
    BOOL ret = FALSE;
    LSTATUS ls;
    INT i;

    sprintfW(key_nameW, device_video_fmtW, video_index);
    lstrcpyW(bufferW, machine_prefixW);
    sprintfW(adapter_keyW, adapter_key_fmtW, guid_string, adapter_index);
    lstrcatW(bufferW, adapter_keyW);

    /* Write value of \Device\Video? (adapter key) in HKLM\HARDWARE\DEVICEMAP\VIDEO\ */
    if (RegSetValueExW(video_hkey, key_nameW, 0, REG_SZ, (const BYTE *)bufferW, (strlenW(bufferW) + 1) * sizeof(WCHAR)))
        goto done;

    /* Create HKLM\System\CurrentControlSet\Control\Video\{GPU GUID}\{Adapter Index} link to GPU driver */
    ls = RegCreateKeyExW(HKEY_LOCAL_MACHINE, adapter_keyW, 0, NULL, REG_OPTION_VOLATILE | REG_OPTION_CREATE_LINK,
                         KEY_ALL_ACCESS, NULL, &hkey, NULL);
    if (ls == ERROR_ALREADY_EXISTS)
        RegCreateKeyExW(HKEY_LOCAL_MACHINE, adapter_keyW, 0, NULL, REG_OPTION_VOLATILE | REG_OPTION_OPEN_LINK,
                        KEY_ALL_ACCESS, NULL, &hkey, NULL);
    if (RegSetValueExW(hkey, symbolic_link_valueW, 0, REG_LINK, (const BYTE *)gpu_driver,
                       strlenW(gpu_driver) * sizeof(WCHAR)))
        goto done;
    RegCloseKey(hkey);
    hkey = NULL;

    /* FIXME:
     * Following information is Wine specific, it doesn't really exist on Windows. It is used so that we can
     * implement EnumDisplayDevices etc by querying registry only. This information is most likely reported by the
     * device driver on Windows */
    RegCreateKeyExW(HKEY_CURRENT_CONFIG, adapter_keyW, 0, NULL, REG_OPTION_VOLATILE, KEY_WRITE, NULL, &hkey, NULL);

    /* Write GPU instance path so that we can find the GPU instance via adapters quickly. Another way is trying to match
     * them via the GUID in Device Paramters/VideoID, but it would required enumrating all GPU instances */
    sprintfW(bufferW, gpu_instance_fmtW, gpu->vendor_id, gpu->device_id, gpu->subsys_id, gpu->revision_id, gpu_index);
    if (RegSetValueExW(hkey, gpu_idW, 0, REG_SZ, (const BYTE *)bufferW, (strlenW(bufferW) + 1) * sizeof(WCHAR)))
        goto done;

    /* Write all monitor instances paths under this adapter */
    for (i = 0; i < monitor_count; i++)
    {
        sprintfW(key_nameW, mointor_id_fmtW, i);
        sprintfW(bufferW, monitor_instance_fmtW, video_index, i);
        if (RegSetValueExW(hkey, key_nameW, 0, REG_SZ, (const BYTE *)bufferW, (strlenW(bufferW) + 1) * sizeof(WCHAR)))
            goto done;
    }

    /* Write StateFlags */
    if (RegSetValueExW(hkey, state_flagsW, 0, REG_DWORD, (const BYTE *)&adapter->state_flags,
                       sizeof(adapter->state_flags)))
        goto done;

    ret = TRUE;
done:
    RegCloseKey(hkey);
    if (!ret)
        ERR("Failed to initialize adapter\n");
    return ret;
}

static BOOL X11DRV_InitMonitor(HDEVINFO devinfo, const struct x11drv_monitor *monitor, int monitor_index,
                               int video_index)
{
    SP_DEVINFO_DATA device_data = {sizeof(SP_DEVINFO_DATA)};
    WCHAR bufferW[MAX_PATH];
    HKEY hkey;
    BOOL ret = FALSE;

    /* Create GUID_DEVCLASS_MONITOR instance */
    sprintfW(bufferW, monitor_instance_fmtW, video_index, monitor_index);
    SetupDiCreateDeviceInfoW(devinfo, bufferW, &GUID_DEVCLASS_MONITOR, monitor->name, NULL, 0, &device_data);
    if (!SetupDiRegisterDeviceInfo(devinfo, &device_data, 0, NULL, NULL, NULL))
        goto done;

    /* Write HardwareID registry property */
    if (!SetupDiSetDeviceRegistryPropertyW(devinfo, &device_data, SPDRP_HARDWAREID,
                                           (const BYTE *)monitor_hardware_idW, sizeof(monitor_hardware_idW)))
        goto done;

    /* Create driver key */
    hkey = SetupDiCreateDevRegKeyW(devinfo, &device_data, DICS_FLAG_GLOBAL, 0, DIREG_DRV, NULL, NULL);
    RegCloseKey(hkey);

    /* FIXME:
     * Following properties are Wine specific, see comments in X11DRV_InitAdapter for details */
    /* StateFlags */
    if (!SetupDiSetDevicePropertyW(devinfo, &device_data, &WINE_DEVPROPKEY_MONITOR_STATEFLAGS, DEVPROP_TYPE_UINT32,
                                   (const BYTE *)&monitor->state_flags, sizeof(monitor->state_flags), 0))
        goto done;

    ret = TRUE;
done:
    if (!ret)
        ERR("Failed to initialize monitor\n");
    return ret;
}

static void prepare_devices(HKEY video_hkey)
{
    static const BOOL not_present = FALSE;
    SP_DEVINFO_DATA device_data = {sizeof(device_data)};
    HDEVINFO devinfo;
    DWORD i = 0;

    /* Remove all monitors */
    devinfo = SetupDiGetClassDevsW(&GUID_DEVCLASS_MONITOR, NULL, NULL, 0);
    while (SetupDiEnumDeviceInfo(devinfo, i++, &device_data))
    {
        if (!SetupDiRemoveDevice(devinfo, &device_data))
            ERR("Failed to remove monitor\n");
    }
    SetupDiDestroyDeviceInfoList(devinfo);

    /* Clean up old adapter keys for reinitialization */
    RegDeleteTreeW(video_hkey, NULL);

    /* FIXME:
     * Currently SetupDiGetClassDevsW with DIGCF_PRESENT is unsupported, So we need to clean up not present devices in
     * case application uses SetupDiGetClassDevsW to enumerate devices. Wrong devices could exist in registry as a result
     * of prefix copying or having devices unplugged. But then we couldn't simply delete GPUs because we need to retain
     * the same GUID for the same GPU. */
    i = 0;
    devinfo = SetupDiGetClassDevsW(&GUID_DEVCLASS_DISPLAY, NULL, NULL, 0);
    while (SetupDiEnumDeviceInfo(devinfo, i++, &device_data))
    {
        if (!SetupDiSetDevicePropertyW(devinfo, &device_data, &DEVPKEY_Device_IsPresent, DEVPROP_TYPE_BOOLEAN,
                                       (const BYTE *)&not_present, sizeof(not_present), 0))
            ERR("Failed to set GPU present property\n");
    }
    SetupDiDestroyDeviceInfoList(devinfo);
}

static void cleanup_devices(void)
{
    SP_DEVINFO_DATA device_data = {sizeof(device_data)};
    HDEVINFO devinfo;
    DWORD type;
    DWORD i = 0;
    BOOL present;

    devinfo = SetupDiGetClassDevsW(&GUID_DEVCLASS_DISPLAY, NULL, NULL, 0);
    while (SetupDiEnumDeviceInfo(devinfo, i++, &device_data))
    {
        present = FALSE;
        SetupDiGetDevicePropertyW(devinfo, &device_data, &DEVPKEY_Device_IsPresent, &type, (BYTE *)&present,
                                  sizeof(present), NULL, 0);
        if (!present && !SetupDiRemoveDevice(devinfo, &device_data))
            ERR("Failed to remove GPU\n");
    }
    SetupDiDestroyDeviceInfoList(devinfo);
}

void X11DRV_DisplayDevices_Init(BOOL force)
{
    static const WCHAR init_mutexW[] = {'d','i','s','p','l','a','y','_','d','e','v','i','c','e','_','i','n','i','t',0};
    HANDLE mutex;
    struct x11drv_gpu *gpus = NULL;
    struct x11drv_adapter *adapters = NULL;
    struct x11drv_monitor *monitors = NULL;
    INT gpu_count, adapter_count, monitor_count;
    INT gpu, adapter, monitor;
    HDEVINFO gpu_devinfo = NULL, monitor_devinfo = NULL;
    HKEY video_hkey = NULL;
    INT video_index = 0;
    DWORD disposition = 0;
    WCHAR guidW[40];
    WCHAR driverW[1024];

    mutex = CreateMutexW(NULL, FALSE, init_mutexW);
    WaitForSingleObject(mutex, INFINITE);

    if (RegCreateKeyExW(HKEY_LOCAL_MACHINE, video_keyW, 0, NULL, REG_OPTION_VOLATILE, KEY_ALL_ACCESS, NULL, &video_hkey,
                        &disposition))
    {
        ERR("Failed to create video device key\n");
        goto done;
    }

    /* Avoid unnecessary reinit */
    if (!force && disposition != REG_CREATED_NEW_KEY)
        goto done;

    TRACE("via %s\n", wine_dbgstr_a(handler.name));

    prepare_devices(video_hkey);

    gpu_devinfo = SetupDiCreateDeviceInfoList(&GUID_DEVCLASS_DISPLAY, NULL);
    monitor_devinfo = SetupDiCreateDeviceInfoList(&GUID_DEVCLASS_MONITOR, NULL);

    /* Initialize GPUs */
    if (!handler.pGetGpus(&gpus, &gpu_count))
        goto done;

    for (gpu = 0; gpu < gpu_count; gpu++)
    {
        if (!X11DRV_InitGpu(gpu_devinfo, &gpus[gpu], gpu, guidW, driverW))
            goto done;

        /* Initialize adapters */
        if (!handler.pGetAdapters(gpus[gpu].id, &adapters, &adapter_count))
            goto done;

        for (adapter = 0; adapter < adapter_count; adapter++)
        {
            if (!handler.pGetMonitors(adapters[adapter].id, &monitors, &monitor_count))
                goto done;

            if (!X11DRV_InitAdapter(video_hkey, video_index, gpu, adapter, monitor_count,
                                    &gpus[gpu], guidW, driverW, &adapters[adapter]))
                goto done;

            /* Initialize monitors */
            for (monitor = 0; monitor < monitor_count; monitor++)
            {
                if (!X11DRV_InitMonitor(monitor_devinfo, &monitors[monitor], monitor, video_index))
                    goto done;
            }

            handler.pFreeMonitors(monitors);
            monitors = NULL;
            video_index++;
        }

        handler.pFreeAdapters(adapters);
        adapters = NULL;
    }

done:
    cleanup_devices();
    SetupDiDestroyDeviceInfoList(monitor_devinfo);
    SetupDiDestroyDeviceInfoList(gpu_devinfo);
    RegCloseKey(video_hkey);
    ReleaseMutex(mutex);
    CloseHandle(mutex);
    if (gpus)
        handler.pFreeGpus(gpus);
    if (adapters)
        handler.pFreeAdapters(adapters);
    if (monitors)
        handler.pFreeMonitors(monitors);
}