using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using Domain.Entities.Developers.ValueObject;

namespace Domain.Entities.Developers;

/// <summary>
/// NICE 통합인증 1회 진행 세션. StartKyc 시 생성 → callback 에서 매칭 → Completed/Failed/Expired.
///
/// 가이드: .claude/plan/nice-auth-integration.md §5
/// </summary>
public class NiceAuthSession
{
    /// <summary>유효기간: 10분 (NICE transaction_id 의 효력과 동일).</summary>
    public static readonly TimeSpan DefaultLifetime = TimeSpan.FromMinutes(10);

    [ForeignKey(nameof(DeveloperID))]
    public virtual Developer? Developer { get; private set; }

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

    public int DeveloperID { get; private set; }

    /// <summary>
    /// 가맹점 측 세션 식별자. NICE return_url path segment 로 embed → callback 매칭.
    /// URL-safe (Base64Url no-padding 22 char).
    /// </summary>
    public string SessionToken { get; private set; } = default!;

    /// <summary>NICE auth/url request 의 request_no.</summary>
    public string RequestNo { get; private set; } = default!;

    /// <summary>NICE auth/url 응답의 transaction_id.</summary>
    public string TransactionID { get; private set; } = default!;

    /// <summary>NICE 표준창이 return_url 로 넘긴 web_transaction_id (callback 시점에 set).</summary>
    public string? WebTransactionID { get; private set; }

    /// <summary>auth/url 호출 시점 token 의 ticket. result 복호화 KDF 입력.</summary>
    public string Ticket { get; private set; } = default!;

    /// <summary>auth/url 호출 시점 token 의 iterators. result 복호화 KDF 입력.</summary>
    public int Iterators { get; private set; }

    public NiceAuthSessionStatus Status { get; private set; } = NiceAuthSessionStatus.Pending;

    public string? FailReason { get; private set; }

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

    public DateTime ExpiresAt { get; private set; }

    public DateTime? CompletedAt { get; private set; }

    private NiceAuthSession() { }

    public static NiceAuthSession Create(
        int developerID,
        string sessionToken,
        string requestNo,
        string transactionID,
        string ticket,
        int iterators
    ) {
        if (string.IsNullOrWhiteSpace(sessionToken))
        {
            throw new ArgumentException("Session token is required.", nameof(sessionToken));
        }
        if (string.IsNullOrWhiteSpace(requestNo))
        {
            throw new ArgumentException("Request no is required.", nameof(requestNo));
        }
        if (string.IsNullOrWhiteSpace(transactionID))
        {
            throw new ArgumentException("Transaction ID is required.", nameof(transactionID));
        }
        if (string.IsNullOrWhiteSpace(ticket))
        {
            throw new ArgumentException("Ticket is required.", nameof(ticket));
        }
        if (iterators <= 0)
        {
            throw new ArgumentOutOfRangeException(nameof(iterators), iterators, "iterators must be positive.");
        }

        var now = DateTime.UtcNow;
        return new NiceAuthSession
        {
            DeveloperID = developerID,
            SessionToken = sessionToken,
            RequestNo = requestNo,
            TransactionID = transactionID,
            Ticket = ticket,
            Iterators = iterators,
            Status = NiceAuthSessionStatus.Pending,
            CreatedAt = now,
            ExpiresAt = now + DefaultLifetime
        };
    }

    /// <summary>callback 에서 web_transaction_id 받아 기록 — result 호출 직전 단계.</summary>
    public void MarkWebTransactionReceived(string webTransactionID)
    {
        if (string.IsNullOrWhiteSpace(webTransactionID))
        {
            throw new ArgumentException("Web transaction ID is required.", nameof(webTransactionID));
        }
        WebTransactionID = webTransactionID;
    }

    public void MarkCompleted()
    {
        Status = NiceAuthSessionStatus.Completed;
        CompletedAt = DateTime.UtcNow;
    }

    public void MarkFailed(string reason)
    {
        Status = NiceAuthSessionStatus.Failed;
        FailReason = reason;
        CompletedAt = DateTime.UtcNow;
    }

    public void MarkExpired()
    {
        Status = NiceAuthSessionStatus.Expired;
        FailReason = "유효시간이 만료되었습니다.";
        CompletedAt = DateTime.UtcNow;
    }

    public bool IsExpired(DateTime utcNow) => utcNow >= ExpiresAt;

    public bool CanProcessCallback() => Status == NiceAuthSessionStatus.Pending;
}