using System;

namespace Contacts
{
    /// <summary>
    /// Represents an address for a contact. Contains methods to determine if two addresses are equal.
    /// </summary>
    public class Address : IEquatable<Address>
    {
        private readonly string _abbr;
        private readonly string _city;
        private readonly string _street;
        private readonly string _zip;
        public AddressType Type { get; }

        /// <summary>
        /// Accepts input string in format "123 Example St,City,ST,12345".
        /// </summary>
        /// <param name="address">Full address</param>
        /// <param name="type">If null, defaults to "Other"</param>
        public Address(string address, AddressType? type)
        {
            string[] parsedAddress = address.Split(",");
            if (parsedAddress.Length != 4)
                throw new ArgumentException("Address must be in the format of \"123 Example St,City,ST,12345\"");

            _street = parsedAddress[0];
            _city = parsedAddress[1];
            _abbr = parsedAddress[2];
            _zip = parsedAddress[3];

            this.Type = type ?? AddressType.Other;
        }

        /// <summary>
        /// Accepts input strings for each part of an address to create a new Address object.
        /// </summary>
        /// <param name="street"></param>
        /// <param name="city"></param>
        /// <param name="abbr"></param>
        /// <param name="zip"></param>
        /// <param name="type">If null, defaults to "Other"</param>
        public Address(string street, string city, string abbr, string zip, AddressType? type)
        {
            this._street = street;
            this._city = city;
            this._abbr = abbr;
            this._zip = zip;

            this.Type = type ?? AddressType.Other;
        }

        /// <summary>
        /// Determines if two addresses are equal, to avoid potential duplication.
        /// </summary>
        /// <param name="otherAddr">Address to compare to. If null, returns false.</param>
        /// <returns>Whether or not the two addresses are the same.</returns>
        public bool Equals(Address? otherAddr)
        {
            if (otherAddr == null)
                return false;

            return this.ToString().Equals(otherAddr.ToString());
        }

        /// <summary>
        /// Formats address object to "123 Example St, City, ST 12345".
        /// </summary>
        /// <returns></returns>
        /// <exception cref="NotImplementedException"></exception>
        public override string ToString()
        {
            return _street + ", " + _city + ", " + _abbr + " " + _zip;
        }
    }
}