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/*
 * Purple - Internet Messaging Library
 * Copyright (C) Pidgin Developers <devel@pidgin.im>
 *
 * Purple is the legal property of its developers, whose names are too numerous
 * to list here. Please refer to the COPYRIGHT file distributed with this
 * source distribution.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 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 General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this library; if not, see <https://www.gnu.org/licenses/>.
 */

#include <gio/gio.h>

#include "purpleattachments.h"
#include "util.h"

struct _PurpleAttachments {
	GObject parent;

	GPtrArray *attachments;
};

enum {
	PROP_0,
	PROP_ITEM_TYPE,
	PROP_N_ITEMS,
	N_PROPERTIES,
};
static GParamSpec *properties[N_PROPERTIES] = {NULL, };

/******************************************************************************
 * Helpers
 *****************************************************************************/
static gboolean
purple_attachments_equal(gconstpointer a, gconstpointer b) {
	PurpleAttachment *attachment1 = (gpointer)a;
	PurpleAttachment *attachment2 = (gpointer)b;

	return purple_attachment_equal(attachment1, attachment2);
}

/******************************************************************************
 * GListModel Implementation
 *****************************************************************************/
static GType
purple_attachments_get_item_type(G_GNUC_UNUSED GListModel *model) {
	return PURPLE_TYPE_ATTACHMENT;
}

static guint
purple_attachments_get_n_items(GListModel *model) {
	PurpleAttachments *attachments = PURPLE_ATTACHMENTS(model);

	return attachments->attachments->len;
}

static gpointer
purple_attachments_get_item(GListModel *model, guint position) {
	PurpleAttachments *attachments = PURPLE_ATTACHMENTS(model);
	PurpleAttachment *attachment = NULL;

	if(position < attachments->attachments->len) {
		attachment = g_ptr_array_index(attachments->attachments, position);

		if(PURPLE_IS_ATTACHMENT(attachment)) {
			g_object_ref(attachment);
		}
	}

	return attachment;
}

static void
purple_attachments_list_model_iface_init(GListModelInterface *iface) {
	iface->get_item_type = purple_attachments_get_item_type;
	iface->get_n_items = purple_attachments_get_n_items;
	iface->get_item = purple_attachments_get_item;
}

/******************************************************************************
 * GObject Implementation
 *****************************************************************************/
G_DEFINE_FINAL_TYPE_WITH_CODE(PurpleAttachments,
                              purple_attachments,
                              G_TYPE_OBJECT,
                              G_IMPLEMENT_INTERFACE(G_TYPE_LIST_MODEL,
                                                    purple_attachments_list_model_iface_init))

static void
purple_attachments_finalize(GObject *obj) {
	PurpleAttachments *attachments = PURPLE_ATTACHMENTS(obj);

	g_clear_pointer(&attachments->attachments, g_ptr_array_unref);

	G_OBJECT_CLASS(purple_attachments_parent_class)->finalize(obj);
}

static void
purple_attachments_get_property(GObject *obj, guint param_id, GValue *value,
                                GParamSpec *pspec)
{
	GListModel *model = G_LIST_MODEL(obj);

	switch(param_id) {
	case PROP_ITEM_TYPE:
		g_value_set_gtype(value, g_list_model_get_item_type(model));
		break;
	case PROP_N_ITEMS:
		g_value_set_uint(value, g_list_model_get_n_items(model));
		break;
	default:
		G_OBJECT_WARN_INVALID_PROPERTY_ID(obj, param_id, pspec);
		break;
	}
}

static void
purple_attachments_init(PurpleAttachments *attachments) {
	attachments->attachments = g_ptr_array_new_full(0, g_object_unref);
}

static void
purple_attachments_class_init(PurpleAttachmentsClass *klass) {
	GObjectClass *obj_class = G_OBJECT_CLASS(klass);

	obj_class->finalize = purple_attachments_finalize;
	obj_class->get_property = purple_attachments_get_property;

	/**
	 * PurpleAttachments:item-type:
	 *
	 * The type of items. See [vfunc@Gio.ListModel.get_item_type].
	 *
	 * Since: 3.0
	 */
	properties[PROP_ITEM_TYPE] = g_param_spec_gtype(
		"item-type", NULL, NULL,
		PURPLE_TYPE_ATTACHMENT,
		G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);

	/**
	 * PurpleAttachments:n-items:
	 *
	 * The number of items. See [vfunc@Gio.ListModel.get_n_items].
	 *
	 * Since: 3.0
	 */
	properties[PROP_N_ITEMS] = g_param_spec_uint(
		"n-items", NULL, NULL,
		0, G_MAXUINT, 0,
		G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);

	g_object_class_install_properties(obj_class, N_PROPERTIES, properties);
}

/******************************************************************************
 * Public API
 *****************************************************************************/
gboolean
purple_attachments_add_attachment(PurpleAttachments *attachments,
                                  PurpleAttachment *attachment)
{
	GObject *obj = NULL;
	gboolean found = FALSE;
	guint len = 0;

	g_return_val_if_fail(PURPLE_IS_ATTACHMENTS(attachments), FALSE);
	g_return_val_if_fail(PURPLE_IS_ATTACHMENT(attachment), FALSE);

	found = g_ptr_array_find_with_equal_func(attachments->attachments,
	                                         attachment,
	                                         purple_attachments_equal,
	                                         NULL);

	if(found) {
		return FALSE;
	}

	/* Store length before adding to make the math easier to understand. */
	len = attachments->attachments->len;

	g_ptr_array_add(attachments->attachments, g_object_ref(attachment));

	obj = G_OBJECT(attachments);
	g_object_freeze_notify(obj);
	g_list_model_items_changed(G_LIST_MODEL(attachments), len, 0, 1);
	g_object_notify_by_pspec(obj, properties[PROP_N_ITEMS]);
	g_object_thaw_notify(obj);

	return TRUE;
}

PurpleAttachment *
purple_attachments_find_with_id(PurpleAttachments *attachments, const char *id)
{
	g_return_val_if_fail(PURPLE_IS_ATTACHMENTS(attachments), NULL);

	for(guint i = 0; i < attachments->attachments->len; i++) {
		PurpleAttachment *attachment = NULL;

		attachment = g_ptr_array_index(attachments->attachments, i);

		if(purple_strequal(purple_attachment_get_id(attachment), id)) {
			return attachment;
		}
	}

	return NULL;
}

PurpleAttachments *
purple_attachments_new(void) {
	return g_object_new(PURPLE_TYPE_ATTACHMENTS, NULL);
}

gboolean
purple_attachments_remove_attachment(PurpleAttachments *attachments,
                                     PurpleAttachment *attachment)
{
	GObject *obj = NULL;
	gboolean found = FALSE;
	guint index = 0;

	g_return_val_if_fail(PURPLE_IS_ATTACHMENTS(attachments), FALSE);
	g_return_val_if_fail(PURPLE_IS_ATTACHMENT(attachment), FALSE);

	found = g_ptr_array_find_with_equal_func(attachments->attachments,
	                                         attachment,
	                                         purple_attachments_equal,
	                                         &index);
	if(!found) {
		return FALSE;
	}

	g_ptr_array_remove_index(attachments->attachments, index);

	obj = G_OBJECT(attachments);
	g_object_freeze_notify(obj);
	g_list_model_items_changed(G_LIST_MODEL(attachments), index, 1, 0);
	g_object_notify_by_pspec(obj, properties[PROP_N_ITEMS]);
	g_object_thaw_notify(obj);

	return TRUE;
}

void
purple_attachments_remove_all(PurpleAttachments *attachments) {
	guint removed = 0;

	g_return_if_fail(PURPLE_IS_ATTACHMENTS(attachments));

	removed = attachments->attachments->len;
	g_ptr_array_remove_range(attachments->attachments, 0, removed);

	if(removed > 0) {
		GObject *obj = G_OBJECT(attachments);
		g_object_freeze_notify(obj);
		g_list_model_items_changed(G_LIST_MODEL(attachments), 0, removed, 0);
		g_object_notify_by_pspec(obj, properties[PROP_N_ITEMS]);
		g_object_thaw_notify(obj);
	}
}