using System.ComponentModel.DataAnnotations;
using System.Text.Json;
using System.Text.Json.Serialization;
using System.Text.RegularExpressions;

namespace DAL.Values
{
	[JsonConverter(typeof(PhoneNumberJsonConverter))]
	public partial class PhoneNumber
	{
		[MaxLength(32)] private string _phoneNumber = null!;

		[JsonIgnore]
		[MaxLength(32)]
		public string value
		{
			get => _phoneNumber;
			set
			{
				if (phoneNumberConfirmation().IsMatch(value))
				{
					_phoneNumber = phoneNumberConfirmation().Replace(value, "$1 ($2) $3-$4");
					_phoneNumber = _phoneNumber.Trim();
				}
				else
				{
					throw new ValidationException("Phone number is invalid");
				}
			}
		}

		public static implicit operator string(PhoneNumber phoneNumber)
		{
			return phoneNumber.value;
		}
		public static implicit operator PhoneNumber(string str)
		{
			return new PhoneNumber { value = str };
		}

		// https://www.abstractapi.com/guides/phone-validation/c-validate-phone-number
		[GeneratedRegex(@"^([+]?[0-9]{1,3})?[-. ]?\(?([0-9]{3})\)?[-. ]?([0-9]{3})[-. ]?([0-9]{4})$")]
		public static partial Regex phoneNumberConfirmation();
	}

	public class PhoneNumberJsonConverter : JsonConverter<PhoneNumber>
	{
		public override PhoneNumber? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
		{
			string? phoneNumber = reader.GetString();
			if (phoneNumber != null)
			{
				if (!PhoneNumber.phoneNumberConfirmation().IsMatch(phoneNumber))
				{
					throw new JsonException("Phone number invalid. Match '^([+]?[0-9]{1,3})?[-. ]?\\(?([0-9]{3})\\)?[-. ]?([0-9]{3})[-. ]?([0-9]{4})$'");
				}

				return new PhoneNumber
				{
					value = phoneNumber
				};
			}

			throw new JsonException("Expected string for PhoneNumber deserialization.");
		}
		public override void Write(Utf8JsonWriter writer, PhoneNumber value, JsonSerializerOptions options)
		{
			writer.WriteStringValue(value);
		}
	}
}