using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using Domain.Entities.Members;

namespace Domain.Entities.Store;

/// <summary>
/// 회원 배송 주소. AES-GCM 으로 PII 필드 암호화 (수령인명/연락처/주소). ZipCode 만 평문.
/// 키 회전 지원: 각 row 의 KeyVersion 컬럼으로 사용한 키 추적.
/// 수령인명 검색은 RecipientName_Hash (SHA-256 hex) 로 수행.
/// 1차 정책: 회원당 최대 5개 주소, IsDefault=true 는 정확히 1개.
/// </summary>
public class MemberAddress
{
    [ForeignKey(nameof(MemberID))]
    public virtual Member? Member { get; private set; }

    [Key]
    public int ID { get; private set; }

    public int MemberID { get; private set; }

    public bool IsDefault { get; private set; }

    // AES-GCM 암호화 컬럼 (Base64)
    public string RecipientName_Encrypted { get; private set; } = default!;

    /// <summary>수령인명 SHA-256 hex (검색용, 64자 대문자). 키 회전과 무관.</summary>
    public string RecipientName_Hash { get; private set; } = default!;

    public string Phone_Encrypted { get; private set; } = default!;

    public string ZipCode { get; private set; } = default!;

    public string Address1_Encrypted { get; private set; } = default!;

    public string Address2_Encrypted { get; private set; } = default!;

    /// <summary>암호화 시 사용한 키 버전 (IFieldEncryptor.CurrentKeyVersion 스냅샷).</summary>
    public int KeyVersion { get; private set; }

    public DateTime CreatedAt { get; private set; } = DateTime.UtcNow;

    public DateTime? UpdatedAt { get; private set; }

    private MemberAddress() { }

    public static MemberAddress Create(
        int memberID,
        string recipientNameEncrypted,
        string recipientNameHash,
        string phoneEncrypted,
        string zipCode,
        string address1Encrypted,
        string address2Encrypted,
        int keyVersion,
        bool isDefault = false
    ) {
        if (memberID <= 0)
        {
            throw new ArgumentOutOfRangeException(nameof(memberID));
        }

        ValidateEncryptedFields(recipientNameEncrypted, recipientNameHash, phoneEncrypted, zipCode, address1Encrypted, address2Encrypted, keyVersion);

        return new MemberAddress
        {
            MemberID = memberID,
            RecipientName_Encrypted = recipientNameEncrypted,
            RecipientName_Hash = recipientNameHash,
            Phone_Encrypted = phoneEncrypted,
            ZipCode = zipCode,
            Address1_Encrypted = address1Encrypted,
            Address2_Encrypted = address2Encrypted,
            KeyVersion = keyVersion,
            IsDefault = isDefault
        };
    }

    public void Update(
        string recipientNameEncrypted,
        string recipientNameHash,
        string phoneEncrypted,
        string zipCode,
        string address1Encrypted,
        string address2Encrypted,
        int keyVersion
    ) {
        ValidateEncryptedFields(recipientNameEncrypted, recipientNameHash, phoneEncrypted, zipCode, address1Encrypted, address2Encrypted, keyVersion);

        RecipientName_Encrypted = recipientNameEncrypted;
        RecipientName_Hash = recipientNameHash;
        Phone_Encrypted = phoneEncrypted;
        ZipCode = zipCode;
        Address1_Encrypted = address1Encrypted;
        Address2_Encrypted = address2Encrypted;
        KeyVersion = keyVersion;
        UpdatedAt = DateTime.UtcNow;
    }

    public void SetAsDefault()
    {
        IsDefault = true;
        UpdatedAt = DateTime.UtcNow;
    }

    public void UnsetDefault()
    {
        IsDefault = false;
        UpdatedAt = DateTime.UtcNow;
    }

    private static void ValidateEncryptedFields(
        string recipientNameEncrypted,
        string recipientNameHash,
        string phoneEncrypted,
        string zipCode,
        string address1Encrypted,
        string address2Encrypted,
        int keyVersion
    ) {
        if (string.IsNullOrWhiteSpace(recipientNameEncrypted))
        {
            throw new ArgumentException("RecipientName_Encrypted is required.", nameof(recipientNameEncrypted));
        }

        if (string.IsNullOrWhiteSpace(recipientNameHash))
        {
            throw new ArgumentException("RecipientName_Hash is required.", nameof(recipientNameHash));
        }

        if (recipientNameHash.Length != 64)
        {
            throw new ArgumentOutOfRangeException(nameof(recipientNameHash), "Hash must be 64 hex chars (SHA-256).");
        }

        if (string.IsNullOrWhiteSpace(phoneEncrypted))
        {
            throw new ArgumentException("Phone_Encrypted is required.", nameof(phoneEncrypted));
        }

        if (string.IsNullOrWhiteSpace(zipCode))
        {
            throw new ArgumentException("ZipCode is required.", nameof(zipCode));
        }

        if (zipCode.Length > 10)
        {
            throw new ArgumentOutOfRangeException(nameof(zipCode));
        }

        if (string.IsNullOrWhiteSpace(address1Encrypted))
        {
            throw new ArgumentException("Address1_Encrypted is required.", nameof(address1Encrypted));
        }

        if (string.IsNullOrWhiteSpace(address2Encrypted))
        {
            throw new ArgumentException("Address2_Encrypted is required.", nameof(address2Encrypted));
        }

        if (keyVersion <= 0)
        {
            throw new ArgumentOutOfRangeException(nameof(keyVersion));
        }
    }
}