/*
 * Copyright (c) 2016 Samsung Electronics Co., Ltd All Rights Reserved
 *
 * Licensed under the Apache License, Version 2.0 (the License);
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an AS IS BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

using System;
using System.Collections.Generic;

namespace Tizen.Maps
{
    /// <summary>
    /// List of <see cref="PlaceAddress"/> objects to be used in <see cref="MapService"/> APIs.
    /// </summary>
    internal class PlaceAddressList : IDisposable
    {
        internal Interop.AddressListHandle handle;
        private List<PlaceAddress> _list;

        /// <summary>
        /// Constructs a map address list object.
        /// </summary>
        /// <exception cref="System.NotSupportedException">Thrown when the required feature is not supported.</exception>
        /// <exception cref="System.InvalidOperationException">Thrown when native operation failed to allocate memory.</exception>
        public PlaceAddressList()
        {
            handle = new Interop.AddressListHandle();
        }

        internal PlaceAddressList(Interop.AddressListHandle nativeHandle)
        {
            handle = nativeHandle;
        }

        /// <summary>
        /// Destroy the PlaceAddressList object.
        /// </summary>
        ~PlaceAddressList()
        {
            Dispose(false);
        }

        /// <summary>
        /// Gets an iterator for addresses in this list.
        /// </summary>
        public IEnumerable<PlaceAddress> Addresses
        {
            get
            {
                if (_list == null)
                {
                    _list = new List<PlaceAddress>();
                    handle.Foreach(addressHandle => _list.Add(new PlaceAddress(addressHandle)));
                }
                return _list;
            }
        }

        #region IDisposable Support
        private bool _disposedValue = false;

        /// <summary>
        /// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
        /// </summary>
        /// <param name="disposing">If true, managed and unmanaged resources can be disposed, otherwise only unmanaged resources can be disposed.</param>
        protected virtual void Dispose(bool disposing)
        {
            if (!_disposedValue)
            {
                if (disposing)
                {
                    _list?.Clear();
                }
                handle?.Dispose();
                _disposedValue = true;
            }
        }

        /// <summary>
        /// Releases all the resources used by this object.
        /// </summary>
        /// <since_tizen> 3 </since_tizen>
        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }
        #endregion
    }
}