/*
 * Copyright © 2011 Kristian Høgsberg
 * Copyright © 2011 Benjamin Franzke
 *
 * 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, sublicense,
 * 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
 * NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS 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.
 *
 * Authors:
 *    Kristian Høgsberg <krh@bitplanet.net>
 *    Benjamin Franzke <benjaminfranzke@googlemail.com>
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stddef.h>
#include <unistd.h>

#include <wayland-server.h>
#include "wayland-drm.h"
#include "wayland-drm-server-protocol.h"

#define MIN(x,y) (((x)<(y))?(x):(y))

struct wl_drm {
	struct wl_display *display;

	void *user_data;
	char *device_name;
        uint32_t flags;

	struct wayland_drm_callbacks *callbacks;
};

static void
destroy_buffer(struct wl_resource *resource)
{
	struct wl_drm_buffer *buffer = resource->data;
	struct wl_drm *drm = buffer->drm;

	drm->callbacks->release_buffer(drm->user_data, buffer);
	free(buffer);
}

static void
buffer_destroy(struct wl_client *client, struct wl_resource *resource)
{
	wl_resource_destroy(resource);
}

const static struct wl_buffer_interface drm_buffer_interface = {
	buffer_destroy
};

static void
create_buffer(struct wl_client *client, struct wl_resource *resource,
              uint32_t id, uint32_t name, int fd,
              int32_t width, int32_t height,
              uint32_t format,
              int32_t offset0, int32_t stride0,
              int32_t offset1, int32_t stride1,
              int32_t offset2, int32_t stride2)
{
	struct wl_drm *drm = resource->data;
	struct wl_drm_buffer *buffer;

	buffer = calloc(1, sizeof *buffer);
	if (buffer == NULL) {
		wl_resource_post_no_memory(resource);
		return;
	}

	buffer->drm = drm;
	buffer->width = width;
	buffer->height = height;
	buffer->format = format;
	buffer->offset[0] = offset0;
	buffer->stride[0] = stride0;
	buffer->offset[1] = offset1;
	buffer->stride[1] = stride1;
	buffer->offset[2] = offset2;
	buffer->stride[2] = stride2;

        drm->callbacks->reference_buffer(drm->user_data, name, fd, buffer);
	if (buffer->driver_buffer == NULL) {
		wl_resource_post_error(resource,
				       WL_DRM_ERROR_INVALID_NAME,
				       "invalid name");
		return;
	}

	buffer->resource =
		wl_resource_create(client, &wl_buffer_interface, 1, id);
	if (!buffer->resource) {
		wl_resource_post_no_memory(resource);
		free(buffer);
		return;
	}

	wl_resource_set_implementation(buffer->resource,
				       (void (**)(void)) &drm_buffer_interface,
				       buffer, destroy_buffer);
}

static void
drm_create_buffer(struct wl_client *client, struct wl_resource *resource,
		  uint32_t id, uint32_t name, int32_t width, int32_t height,
		  uint32_t stride, uint32_t format)
{
        switch (format) {
        case WL_DRM_FORMAT_ARGB8888:
        case WL_DRM_FORMAT_XRGB8888:
        case WL_DRM_FORMAT_YUYV:
                break;
        default:
                wl_resource_post_error(resource,
                                       WL_DRM_ERROR_INVALID_FORMAT,
                                       "invalid format");
           return;
        }

        create_buffer(client, resource, id,
                      name, -1, width, height, format, 0, stride, 0, 0, 0, 0);
}

static void
drm_create_planar_buffer(struct wl_client *client,
                         struct wl_resource *resource,
                         uint32_t id, uint32_t name,
                         int32_t width, int32_t height, uint32_t format,
                         int32_t offset0, int32_t stride0,
                         int32_t offset1, int32_t stride1,
                         int32_t offset2, int32_t stride2)
{
        switch (format) {
	case WL_DRM_FORMAT_YUV410:
	case WL_DRM_FORMAT_YUV411:
	case WL_DRM_FORMAT_YUV420:
	case WL_DRM_FORMAT_YUV422:
	case WL_DRM_FORMAT_YUV444:
	case WL_DRM_FORMAT_NV12:
        case WL_DRM_FORMAT_NV16:
                break;
        default:
                wl_resource_post_error(resource,
                                       WL_DRM_ERROR_INVALID_FORMAT,
                                       "invalid format");
           return;
        }

        create_buffer(client, resource, id, name, -1, width, height, format,
                      offset0, stride0, offset1, stride1, offset2, stride2);
}

static void
drm_create_prime_buffer(struct wl_client *client,
                        struct wl_resource *resource,
                        uint32_t id, int fd,
                        int32_t width, int32_t height, uint32_t format,
                        int32_t offset0, int32_t stride0,
                        int32_t offset1, int32_t stride1,
                        int32_t offset2, int32_t stride2)
{
        create_buffer(client, resource, id, 0, fd, width, height, format,
                      offset0, stride0, offset1, stride1, offset2, stride2);
        close(fd);
}

static void
drm_authenticate(struct wl_client *client,
		 struct wl_resource *resource, uint32_t id)
{
	struct wl_drm *drm = resource->data;

	if (drm->callbacks->authenticate(drm->user_data, id) < 0)
		wl_resource_post_error(resource,
				       WL_DRM_ERROR_AUTHENTICATE_FAIL,
				       "authenicate failed");
	else
		wl_resource_post_event(resource, WL_DRM_AUTHENTICATED);
}

const static struct wl_drm_interface drm_interface = {
	drm_authenticate,
	drm_create_buffer,
        drm_create_planar_buffer,
        drm_create_prime_buffer
};

static void
bind_drm(struct wl_client *client, void *data, uint32_t version, uint32_t id)
{
	struct wl_drm *drm = data;
	struct wl_resource *resource;
        uint32_t capabilities;

	resource = wl_resource_create(client, &wl_drm_interface,
				      MIN(version, 2), id);
	if (!resource) {
		wl_client_post_no_memory(client);
		return;
	}

	wl_resource_set_implementation(resource, &drm_interface, data, NULL);

	wl_resource_post_event(resource, WL_DRM_DEVICE, drm->device_name);
	wl_resource_post_event(resource, WL_DRM_FORMAT,
			       WL_DRM_FORMAT_ARGB8888);
	wl_resource_post_event(resource, WL_DRM_FORMAT,
			       WL_DRM_FORMAT_XRGB8888);
        wl_resource_post_event(resource, WL_DRM_FORMAT, WL_DRM_FORMAT_YUV410);
        wl_resource_post_event(resource, WL_DRM_FORMAT, WL_DRM_FORMAT_YUV411);
        wl_resource_post_event(resource, WL_DRM_FORMAT, WL_DRM_FORMAT_YUV420);
        wl_resource_post_event(resource, WL_DRM_FORMAT, WL_DRM_FORMAT_YUV422);
        wl_resource_post_event(resource, WL_DRM_FORMAT, WL_DRM_FORMAT_YUV444);
        wl_resource_post_event(resource, WL_DRM_FORMAT, WL_DRM_FORMAT_NV12);
        wl_resource_post_event(resource, WL_DRM_FORMAT, WL_DRM_FORMAT_NV16);
        wl_resource_post_event(resource, WL_DRM_FORMAT, WL_DRM_FORMAT_YUYV);

        capabilities = 0;
        if (drm->flags & WAYLAND_DRM_PRIME)
           capabilities |= WL_DRM_CAPABILITY_PRIME;

        if (version >= 2)
           wl_resource_post_event(resource, WL_DRM_CAPABILITIES, capabilities);
}

struct wl_drm_buffer *
wayland_drm_buffer_get(struct wl_resource *resource)
{
	if (resource == NULL)
		return NULL;

	if (wl_resource_instance_of(resource, &wl_buffer_interface,
				    &drm_buffer_interface))
		return wl_resource_get_user_data(resource);
	else
		return NULL;
}

struct wl_drm *
wayland_drm_init(struct wl_display *display, char *device_name,
                 struct wayland_drm_callbacks *callbacks, void *user_data,
                 uint32_t flags)
{
	struct wl_drm *drm;

	drm = malloc(sizeof *drm);

	drm->display = display;
	drm->device_name = strdup(device_name);
	drm->callbacks = callbacks;
	drm->user_data = user_data;
        drm->flags = flags;

	wl_global_create(display, &wl_drm_interface, 2, drm, bind_drm);

	return drm;
}

void
wayland_drm_uninit(struct wl_drm *drm)
{
	free(drm->device_name);

	/* FIXME: need wl_display_del_{object,global} */

	free(drm);
}

uint32_t
wayland_drm_buffer_get_format(struct wl_drm_buffer *buffer)
{
	return buffer->format;
}

void *
wayland_drm_buffer_get_buffer(struct wl_drm_buffer *buffer)
{
	return buffer->driver_buffer;
}