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﻿// Copyright © Joerg Battermann 2014, Matt Hunt 2017
using System.Collections.Generic;
using System.Linq;
using Newtonsoft.Json;
using System;
using System.Collections.ObjectModel;
using GeoJSON.Net.Converters;
namespace GeoJSON.Net.Geometry
    /// <summary>
    /// Contains an array of <see cref="Point" />.
    /// </summary>
    /// <remarks>
    /// See https://tools.ietf.org/html/rfc7946#section-3.1.3
    /// </remarks>
    public class MultiPoint : GeoJSONObject, IGeometryObject, IEqualityComparer<MultiPoint>, IEquatable<MultiPoint>
        /// <summary>
        /// Initializes a new instance of the <see cref="MultiPoint" /> class.
        /// </summary>
        /// <param name="coordinates">The coordinates.</param>
        public MultiPoint(IEnumerable<Point> coordinates)
            Coordinates = new ReadOnlyCollection<Point>(coordinates?.ToArray() ?? new Point[0]);
        [JsonConstructor]
        public MultiPoint(IEnumerable<IEnumerable<double>> coordinates)
        : this(coordinates?.Select(position => new Point(position.ToPosition()))
               ?? throw new ArgumentNullException(nameof(coordinates)))
        public override GeoJSONObjectType Type => GeoJSONObjectType.MultiPoint;
        /// <summary>
        /// The points contained in this <see cref="MultiPoint"/>.
        /// </summary>
        [JsonProperty("coordinates", Required = Required.Always)]
        [JsonConverter(typeof(PointEnumerableConverter))]
        public ReadOnlyCollection<Point> Coordinates { get; }
        #region IEqualityComparer, IEquatable
        /// <summary>
        /// Determines whether the specified object is equal to the current object
        /// </summary>
        public override bool Equals(object obj)
            return Equals(this, obj as MultiPoint);
        /// <summary>
        /// Determines whether the specified object is equal to the current object
        /// </summary>
        public bool Equals(MultiPoint other)
            return Equals(this, other);
        /// <summary>
        /// Determines whether the specified object instances are considered equal
        /// </summary>
        public bool Equals(MultiPoint left, MultiPoint right)
            if (base.Equals(left, right))
                return left.Coordinates.SequenceEqual(right.Coordinates);
            return false;
        /// <summary>
        /// Determines whether the specified object instances are considered equal
        /// </summary>
        public static bool operator ==(MultiPoint left, MultiPoint right)
            if (ReferenceEquals(left, right))
                return true;
            if (ReferenceEquals(null, right))
                return false;
            return left != null && left.Equals(right);
        /// <summary>
        /// Determines whether the specified object instances are not considered equal
        /// </summary>
        public static bool operator !=(MultiPoint left, MultiPoint right)
            return !(left == right);
        /// <summary>
        /// Returns the hash code for this instance
        /// </summary>
        public override int GetHashCode()
            int hash = base.GetHashCode();
            foreach (var item in Coordinates)
                hash = (hash * 397) ^ item.GetHashCode();
            return hash;
        /// <summary>
        /// Returns the hash code for the specified object
        /// </summary>
        public int GetHashCode(MultiPoint other)
            return other.GetHashCode();
        #endregion

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