/* Spa libcamera client
 *
 * Copyright (C) 2020, Collabora Ltd.
 *     Author: Raghavendra Rao Sidlagatta <raghavendra.rao@collabora.com>
 *
 * libcamera-client.c
 *
 * 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.
 */

#include <errno.h>
#include <stddef.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#include <spa/support/log.h>
#include <spa/support/loop.h>
#include <spa/support/plugin.h>
#include <spa/utils/type.h>
#include <spa/utils/keys.h>
#include <spa/utils/names.h>
#include <spa/utils/string.h>
#include <spa/monitor/device.h>
#include <spa/monitor/utils.h>

#include "libcamera.h"

struct impl {
	struct spa_handle handle;
	struct spa_device device;

	struct spa_log *log;
	struct spa_loop *main_loop;

	struct spa_hook_list hooks;

	uint64_t info_all;
	struct spa_device_info info;

	struct spa_source source;
};

static int emit_object_info(struct impl *this, uint32_t id)
{
	struct spa_device_object_info info;
	struct spa_dict_item items[20];
	uint32_t n_items = 0;

	info = SPA_DEVICE_OBJECT_INFO_INIT();

	info.type = SPA_TYPE_INTERFACE_Device;
	info.factory_name = SPA_NAME_API_LIBCAMERA_DEVICE;
	info.change_mask = (SPA_DEVICE_OBJECT_CHANGE_MASK_FLAGS |
		SPA_DEVICE_OBJECT_CHANGE_MASK_PROPS);
	info.flags = 0;

	items[n_items++] = SPA_DICT_ITEM_INIT(SPA_KEY_DEVICE_ENUM_API,"libcamera-client");
	items[n_items++] = SPA_DICT_ITEM_INIT(SPA_KEY_DEVICE_API, "libcamera");
	items[n_items++] = SPA_DICT_ITEM_INIT(SPA_KEY_MEDIA_CLASS, "Video/Device");

	info.props = &SPA_DICT_INIT(items, n_items);
	spa_device_emit_object_info(&this->hooks, id, &info);

	return 1;
}

static const struct spa_dict_item device_info_items[] = {
	{ SPA_KEY_DEVICE_API, "libcamera" },
	{ SPA_KEY_DEVICE_NICK, "libcamera-client" },
	{ SPA_KEY_API_UDEV_MATCH, "libcamera" },
};


static void emit_device_info(struct impl *this, bool full)
{
	uint64_t old = full ? this->info.change_mask : 0;
	if (full)
		this->info.change_mask = this->info_all;
	if (this->info.change_mask) {
		this->info.props = &SPA_DICT_INIT_ARRAY(device_info_items);
		spa_device_emit_info(&this->hooks, &this->info);
		this->info.change_mask = old;
	}
}

static void impl_hook_removed(struct spa_hook *hook)
{
	return;
}

static int
impl_device_add_listener(void *object, struct spa_hook *listener,
		const struct spa_device_events *events, void *data)
{
	struct impl *this = object;
	struct spa_hook_list save;

	spa_return_val_if_fail(this != NULL, -EINVAL);
	spa_return_val_if_fail(events != NULL, -EINVAL);

	spa_hook_list_isolate(&this->hooks, &save, listener, events, data);

	emit_device_info(this, true);

	emit_object_info(this, 0);

	spa_hook_list_join(&this->hooks, &save);

	listener->removed = impl_hook_removed;
	listener->priv = this;

	return 0;
}

static const struct spa_device_methods impl_device = {
	SPA_VERSION_DEVICE_METHODS,
	.add_listener = impl_device_add_listener,
};

static int impl_get_interface(struct spa_handle *handle, const char *type, void **interface)
{
	struct impl *this;

	spa_return_val_if_fail(handle != NULL, -EINVAL);
	spa_return_val_if_fail(interface != NULL, -EINVAL);

	this = (struct impl *) handle;

	if (spa_streq(type, SPA_TYPE_INTERFACE_Device))
		*interface = &this->device;
	else
		return -ENOENT;

	return 0;
}

static int impl_clear(struct spa_handle *handle)
{
	struct impl *this = (struct impl *) handle;

	if(this->dev.camera) {
		deleteLibCamera(this->dev.camera);
		this->dev.camera = NULL;
	}
	return 0;
}

static size_t
impl_get_size(const struct spa_handle_factory *factory,
	      const struct spa_dict *params)
{
	return sizeof(struct impl);
}

static int
impl_init(const struct spa_handle_factory *factory,
	  struct spa_handle *handle,
	  const struct spa_dict *info,
	  const struct spa_support *support,
	  uint32_t n_support)
{
	struct impl *this;

	spa_return_val_if_fail(factory != NULL, -EINVAL);
	spa_return_val_if_fail(handle != NULL, -EINVAL);

	handle->get_interface = impl_get_interface;
	handle->clear = impl_clear;

	this = (struct impl *) handle;

	this->log = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_Log);
	libcamera_log_topic_init(this->log);

	this->main_loop = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_Loop);

	if (this->main_loop == NULL) {
		spa_log_error(this->log, "a main-loop is needed");
		return -EINVAL;
	}
	spa_hook_list_init(&this->hooks);

	this->device.iface = SPA_INTERFACE_INIT(
			SPA_TYPE_INTERFACE_Device,
			SPA_VERSION_DEVICE,
			&impl_device, this);

	this->info = SPA_DEVICE_INFO_INIT();
	this->info_all = SPA_DEVICE_CHANGE_MASK_FLAGS |
			SPA_DEVICE_CHANGE_MASK_PROPS;
	this->info.flags = 0;

	if(this->dev.camera == NULL)
		this->dev.camera = (LibCamera*)newLibCamera();
	if(this->dev.camera != NULL)
		libcamera_set_log(this->dev.camera, this->dev.log);

	return 0;
}

static const struct spa_interface_info impl_interfaces[] = {
	{SPA_TYPE_INTERFACE_Device,},
};

static int
impl_enum_interface_info(const struct spa_handle_factory *factory,
			 const struct spa_interface_info **info,
			 uint32_t *index)
{
	spa_return_val_if_fail(factory != NULL, -EINVAL);
	spa_return_val_if_fail(info != NULL, -EINVAL);
	spa_return_val_if_fail(index != NULL, -EINVAL);

	if (*index >= SPA_N_ELEMENTS(impl_interfaces))
		return 0;

	*info = &impl_interfaces[(*index)++];
	return 1;
}

const struct spa_handle_factory spa_libcamera_client_factory = {
	SPA_VERSION_HANDLE_FACTORY,
	SPA_NAME_API_LIBCAMERA_ENUM_CLIENT,
	NULL,
	impl_get_size,
	impl_init,
	impl_enum_interface_info,
};