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

namespace Domain.Entities.Payments.Toss;

/// <summary>
/// 토스페이먼츠 결제 승인 요청 + 응답 통합
/// confirm API 호출 시 요청 데이터를 먼저 저장하고, 응답 수신 시 업데이트
/// </summary>
public class TossConfirm
{
    [ForeignKey(nameof(MemberID))]
    public virtual Member? Member { get; private set; }

    [ForeignKey(nameof(PaymentOrderID))]
    public virtual PaymentOrder? PaymentOrder { get; private set; }

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

    public int MemberID { get; private set; }

    public int PaymentOrderID { get; private set; }

    /// <summary>토스 결제 키 (unique — 취소·조회 API 호출에 필요)</summary>
    public string PaymentKey { get; private set; } = default!;

    /// <summary>가맹점 주문번호</summary>
    public string OrderID { get; private set; } = default!;

    /// <summary>승인 요청 금액 (서버 저장 주문 금액)</summary>
    public int Amount { get; private set; }

    // ── 응답 필드 (승인 완료/실패 시 업데이트) ──────────────────────

    /// <summary>응답 코드 (SUCCESS = 성공, 그 외 = Toss 에러 코드/EXCEPTION)</summary>
    public string? ResponseCode { get; private set; }

    /// <summary>응답 메시지 (실패 사유)</summary>
    public string? ResponseMessage { get; private set; }

    /// <summary>Toss Payment.status (DONE / WAITING_FOR_DEPOSIT / CANCELED / ABORTED / EXPIRED ...)</summary>
    public string? Status { get; private set; }

    /// <summary>결제수단 (Toss method 문자열 — 카드/가상계좌/간편결제 등)</summary>
    public string? Method { get; private set; }

    /// <summary>최종 승인 금액 (Toss totalAmount)</summary>
    public int? TotalAmount { get; private set; }

    /// <summary>승인 일시 (UTC)</summary>
    public DateTime? ApprovedAt { get; private set; }

    /// <summary>영수증 URL (Toss receipt.url)</summary>
    public string? ReceiptUrl { get; private set; }

    /// <summary>Toss Payment 객체 원문 JSON — 대사/CS 용</summary>
    public string? RawResponse { get; private set; }

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

    public DateTime? UpdatedAt { get; private set; }

    private TossConfirm() { }

    /// <summary>승인 요청 시 생성 (응답 전)</summary>
    public static TossConfirm CreateRequest(
        int memberID,
        int paymentOrderID,
        string paymentKey,
        string orderID,
        int amount
    ) {
        return new TossConfirm
        {
            MemberID = memberID,
            PaymentOrderID = paymentOrderID,
            PaymentKey = paymentKey,
            OrderID = orderID,
            Amount = amount
        };
    }

    /// <summary>승인 성공 응답 수신 시 업데이트</summary>
    public void SetResponse(
        string status,
        string? method = null,
        int? totalAmount = null,
        DateTime? approvedAt = null,
        string? receiptUrl = null,
        string? rawResponse = null
    ) {
        ResponseCode = "SUCCESS";
        ResponseMessage = null;
        Status = status;
        Method = method;
        TotalAmount = totalAmount;
        ApprovedAt = approvedAt;
        ReceiptUrl = receiptUrl;
        RawResponse = rawResponse;
        UpdatedAt = DateTime.UtcNow;
    }

    /// <summary>승인 실패/예외 시 업데이트</summary>
    public void SetError(string code, string message)
    {
        ResponseCode = code;
        ResponseMessage = message.Length > 500 ? message[..500] : message;
        UpdatedAt = DateTime.UtcNow;
    }

    /// <summary>
    /// 재승인(대사 재확인) 시 기존 요청 행을 재사용한다. PaymentKey/OrderID unique 인덱스 충돌을 피하려
    /// 새 행을 만들지 않고, 결제 키를 갱신하고 이전 응답을 초기화해 "요청 후 응답 미수신" 상태로 되돌린다. (Phase 1.5 승계)
    /// </summary>
    public void PrepareRetry(string paymentKey)
    {
        PaymentKey = paymentKey;
        ResponseCode = null;
        ResponseMessage = null;
        UpdatedAt = DateTime.UtcNow;
    }

    public bool IsSuccess => ResponseCode == "SUCCESS";
}