/*
 * Copyright (c) 2007 Intel Corporation. All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 * 
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
 * IN NO EVENT SHALL PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR
 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#define _GNU_SOURCE 1
#include "sysdeps.h"
#include "va.h"
#include "va_backend.h"
#include "va_internal.h"
#include "va_trace.h"
#include "va_fool.h"
#include "va_android.h"
#include "va_drmcommon.h"
#include "va_drm_utils.h"
#include <stdarg.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <dlfcn.h>
#include <errno.h>


#define CHECK_SYMBOL(func) { if (!func) printf("func %s not found\n", #func); return VA_STATUS_ERROR_UNKNOWN; }
#define DEVICE_NAME "/dev/dri/renderD128"

static int open_device (char *dev_name)
{
    struct stat st;
    int fd;

    if (-1 == stat (dev_name, &st))
    {
        printf ("Cannot identify '%s': %d, %s\n",
                dev_name, errno, strerror (errno));
        return -1;
    }

    if (!S_ISCHR (st.st_mode))
    {
        printf ("%s is no device\n", dev_name);
        return -1;
    }

    fd = open (dev_name, O_RDWR);

    if (-1 == fd)
    {
        fprintf (stderr, "Cannot open '%s': %d, %s\n",
                 dev_name, errno, strerror (errno));
        return -1;
    }

    return fd;
}

static int va_DisplayContextIsValid (
    VADisplayContextP pDisplayContext
                                  )
{
    return (pDisplayContext != NULL &&
            pDisplayContext->pDriverContext != NULL);
}

static void va_DisplayContextDestroy (
    VADisplayContextP pDisplayContext
)
{
    struct drm_state *drm_state;

    if (pDisplayContext == NULL)
        return;

    /* close the open-ed DRM fd */
    drm_state = (struct drm_state *)pDisplayContext->pDriverContext->drm_state;
    close(drm_state->fd);

    free(pDisplayContext->pDriverContext->drm_state);
    free(pDisplayContext->pDriverContext);
    free(pDisplayContext);
}

static VAStatus va_DisplayContextGetNumCandidates(
    VADisplayContextP pDisplayContext,
    int *num_candidates
)
{
    VADriverContextP const ctx = pDisplayContext->pDriverContext;
    struct drm_state * drm_state = (struct drm_state *)ctx->drm_state;

    memset(drm_state, 0, sizeof(*drm_state));
    drm_state->fd = open_device((char *)DEVICE_NAME);

    if (drm_state->fd < 0) {
        fprintf(stderr,"can't open DRM devices\n");
        return VA_STATUS_ERROR_UNKNOWN;
    }
    drm_state->auth_type = VA_DRM_AUTH_CUSTOM;
    return VA_DRM_GetNumCandidates(ctx, num_candidates);
}

static VAStatus va_DisplayContextGetDriverNameByIndex (
    VADisplayContextP pDisplayContext,
    char **driver_name,
    int candidate_index
)
{
    VADriverContextP const ctx = pDisplayContext->pDriverContext;

    return VA_DRM_GetDriverName(ctx, driver_name, candidate_index);
}


VADisplay vaGetDisplay (
    void *native_dpy /* implementation specific */
)
{
    VADisplayContextP pDisplayContext;
    VADriverContextP  pDriverContext;
    struct drm_state *drm_state;

    if (!native_dpy)
        return NULL;

    pDisplayContext = va_newDisplayContext();
    if (!pDisplayContext)
        return NULL;

    pDisplayContext->vaIsValid       = va_DisplayContextIsValid;
    pDisplayContext->vaDestroy       = va_DisplayContextDestroy;
    pDisplayContext->vaGetDriverNameByIndex = va_DisplayContextGetDriverNameByIndex;
    pDisplayContext->vaGetNumCandidates = va_DisplayContextGetNumCandidates;

    pDriverContext = va_newDriverContext(pDisplayContext);
    if (!pDriverContext) {
        free(pDisplayContext);
        return NULL;
    }

    pDriverContext->native_dpy   = (void *)native_dpy;
    pDriverContext->display_type = VA_DISPLAY_ANDROID;

    drm_state = (struct drm_state*)calloc(1, sizeof(*drm_state));
    if (!drm_state) {
        free(pDisplayContext);
        free(pDriverContext);
        return NULL;
    }

    pDriverContext->drm_state = drm_state;

    return (VADisplay)pDisplayContext;
}