using System.Collections.Generic;
using System.Linq;
 
namespace Microsoft.Maui.ApplicationModel.Communication
{
	/// <summary>
	/// Represents a contact on the user's device.
	/// </summary>
	public class Contact
	{
		string displayName;
 
		/// <summary>
		/// Initializes a new instance of the <see cref="Contact"/> class.
		/// </summary>
		public Contact()
		{
		}
 
		/// <summary>
		/// Initializes a new instance of the <see cref="Contact"/> class with the given data.
		/// </summary>
		/// <param name="id">The identifier of the contact.</param>
		/// <param name="namePrefix">The prefix of the contact.</param>
		/// <param name="givenName">The given name (or first name) of the contact.</param>
		/// <param name="middleName">The middle name(s) of the contact.</param>
		/// <param name="familyName">The family name (or last name) of the contact.</param>
		/// <param name="nameSuffix">The suffix of the contact.</param>
		/// <param name="phones">A collection of phone numbers for the contact.</param>
		/// <param name="email">A collection of email addresses for the contact.</param>
		/// <param name="displayName">The display name of the contact.</param>
		public Contact(
			string id,
			string namePrefix,
			string givenName,
			string middleName,
			string familyName,
			string nameSuffix,
			IEnumerable<ContactPhone> phones,
			IEnumerable<ContactEmail> email,
			string displayName = null)
		{
			Id = id;
			NamePrefix = namePrefix;
			GivenName = givenName;
			MiddleName = middleName;
			FamilyName = familyName;
			NameSuffix = nameSuffix;
			Phones.AddRange(phones?.ToList());
			Emails.AddRange(email?.ToList());
			DisplayName = displayName;
		}
 
		/// <summary>
		/// Gets or sets the identifier of the contact.
		/// </summary>
		public string Id { get; set; }
 
		/// <summary>
		/// Gets or sets the display name of the contact.
		/// </summary>
		/// <remarks>If no display name is set, a display name is inferred from <see cref="GivenName"/> and <see cref="FamilyName"/>.</remarks>
		public string DisplayName
		{
			get => !string.IsNullOrWhiteSpace(displayName) ? displayName : BuildDisplayName();
			private set => displayName = value;
		}
 
		/// <summary>
		/// Gets or sets the name prefix of the contact.
		/// </summary>
		public string NamePrefix { get; set; }
 
		/// <summary>
		/// Gets or sets the given name (or first name) of the contact.
		/// </summary>
		public string GivenName { get; set; }
 
		/// <summary>
		/// Gets or sets the middle name(s) of the contact.
		/// </summary>
		public string MiddleName { get; set; }
 
		/// <summary>
		/// Gets or sets the family name (or last name) of the contact.
		/// </summary>
		public string FamilyName { get; set; }
 
		/// <summary>
		/// Gets or sets the name suffix of the contact.
		/// </summary>
		public string NameSuffix { get; set; }
 
		/// <summary>
		/// Gets or sets a collection of phone numbers of the contact.
		/// </summary>
		public List<ContactPhone> Phones { get; set; } = new List<ContactPhone>();
 
		/// <summary>
		/// Gets or sets a collection of email addresses of the contact.
		/// </summary>
		public List<ContactEmail> Emails { get; set; } = new List<ContactEmail>();
 
		/// <summary>
		/// Returns a string representation of the current values of <see cref="Contact"/>.
		/// </summary>
		/// <returns>A string representation of this instance. The return value is the current value of <see cref="DisplayName"/>.</returns>
		public override string ToString() => DisplayName;
 
		string BuildDisplayName()
		{
			if (string.IsNullOrWhiteSpace(GivenName))
				return FamilyName;
			if (string.IsNullOrWhiteSpace(FamilyName))
				return GivenName;
 
			return $"{GivenName} {FamilyName}";
		}
	}
 
	/// <summary>
	/// Represents an email address that is associated with a <see cref="Contact"/>.
	/// </summary>
	public class ContactEmail
	{
		/// <summary>
		/// Initializes a new instance of the <see cref="ContactEmail"/> class.
		/// </summary>
		public ContactEmail()
		{
		}
 
		/// <summary>
		/// Initializes a new instance of the <see cref="ContactEmail"/> class with the given data.
		/// </summary>
		/// <param name="emailAddress">The email address.</param>
		public ContactEmail(string emailAddress)
		{
			EmailAddress = emailAddress;
		}
 
		/// <summary>
		/// Gets or sets the email address.
		/// </summary>
		public string EmailAddress { get; set; }
 
		/// <summary>
		/// Returns a string representation of the current values of <see cref="Contact"/>.
		/// </summary>
		/// <returns>A string representation of this instance. The return value is the current value of <see cref="EmailAddress"/>.</returns>
		public override string ToString() => EmailAddress;
	}
 
	/// <summary>
	/// Represents a phone number that is associated with a <see cref="Contact"/>.
	/// </summary>
	public class ContactPhone
	{
		/// <summary>
		/// Initializes a new instance of the <see cref="ContactPhone"/> class.
		/// </summary>
		public ContactPhone()
		{
		}
 
		/// <summary>
		/// Initializes a new instance of the <see cref="ContactPhone"/> class with the given data.
		/// </summary>
		/// <param name="phoneNumber">The phone number.</param>
		public ContactPhone(string phoneNumber)
		{
			PhoneNumber = phoneNumber;
		}
 
		/// <summary>
		/// Gets or sets the phone number.
		/// </summary>
		public string PhoneNumber { get; set; }
 
		/// <summary>
		/// Returns a string representation of the current values of <see cref="Contact"/>.
		/// </summary>
		/// <returns>A string representation of this instance. The return value is the current value of <see cref="PhoneNumber"/>.</returns>
		public override string ToString() => PhoneNumber;
	}
}