using Fengling.Backend.Domain.AggregatesModel.MemberAggregate;

namespace Fengling.Backend.Domain.AggregatesModel.PointsTransactionAggregate;

/// <summary>
/// 积分交易ID
/// </summary>
public partial record PointsTransactionId : IGuidStronglyTypedId;

/// <summary>
/// 积分交易聚合根
/// </summary>
public class PointsTransaction : Entity<PointsTransactionId>, IAggregateRoot
{
    protected PointsTransaction() { }

    /// <summary>
    /// 创建积分交易记录
    /// </summary>
    public static PointsTransaction CreateEarnTransaction(
        MemberId memberId,
        int amount,
        string source,
        string reason,
        Guid relatedId,
        DateTime expiryDate)
    {
        if (amount <= 0)
            throw new KnownException("积分数量必须大于0");

        return new PointsTransaction
        {
            MemberId = memberId,
            Type = PointsTransactionType.Earn,
            Amount = amount,
            Source = source,
            Reason = reason,
            RelatedId = relatedId,
            ExpiryDate = expiryDate,
            CreatedAt = DateTime.UtcNow
        };
    }

    /// <summary>
    /// 创建积分消费记录
    /// </summary>
    public static PointsTransaction CreateConsumeTransaction(
        MemberId memberId,
        int amount,
        string reason,
        Guid orderId)
    {
        if (amount <= 0)
            throw new KnownException("积分数量必须大于0");

        return new PointsTransaction
        {
            MemberId = memberId,
            Type = PointsTransactionType.Consume,
            Amount = amount,
            Source = "兑换消费",
            Reason = reason,
            RelatedId = orderId,
            CreatedAt = DateTime.UtcNow
        };
    }

    /// <summary>
    /// 创建积分退还记录
    /// </summary>
    public static PointsTransaction CreateRefundTransaction(
        MemberId memberId,
        int amount,
        string reason,
        Guid orderId)
    {
        if (amount <= 0)
            throw new KnownException("积分数量必须大于0");

        return new PointsTransaction
        {
            MemberId = memberId,
            Type = PointsTransactionType.Refund,
            Amount = amount,
            Source = "订单退还",
            Reason = reason,
            RelatedId = orderId,
            CreatedAt = DateTime.UtcNow
        };
    }

    /// <summary>
    /// 创建积分过期记录
    /// </summary>
    public static PointsTransaction CreateExpireTransaction(
        MemberId memberId,
        int amount,
        Guid batchId)
    {
        if (amount <= 0)
            throw new KnownException("积分数量必须大于0");

        return new PointsTransaction
        {
            MemberId = memberId,
            Type = PointsTransactionType.Expire,
            Amount = amount,
            Source = "积分过期",
            Reason = "积分已过期自动失效",
            RelatedId = batchId,
            CreatedAt = DateTime.UtcNow
        };
    }

    /// <summary>
    /// 会员ID
    /// </summary>
    public MemberId MemberId { get; private set; } = default!;

    /// <summary>
    /// 交易类型
    /// </summary>
    public PointsTransactionType Type { get; private set; }

    /// <summary>
    /// 积分数量
    /// </summary>
    public int Amount { get; private set; }

    /// <summary>
    /// 来源
    /// </summary>
    public string Source { get; private set; } = string.Empty;

    /// <summary>
    /// 原因描述
    /// </summary>
    public string Reason { get; private set; } = string.Empty;

    /// <summary>
    /// 关联ID(营销码ID/订单ID等)
    /// </summary>
    public Guid RelatedId { get; private set; }

    /// <summary>
    /// 过期时间(仅获取类型有效)
    /// </summary>
    public DateTime? ExpiryDate { get; private set; }

    /// <summary>
    /// 创建时间
    /// </summary>
    public DateTime CreatedAt { get; private set; }

    public Deleted Deleted { get; private set; } = new();
    public RowVersion RowVersion { get; private set; } = new(0);
}

/// <summary>
/// 积分交易类型
/// </summary>
public enum PointsTransactionType
{
    /// <summary>
    /// 获得
    /// </summary>
    Earn = 1,

    /// <summary>
    /// 消费
    /// </summary>
    Consume = 2,

    /// <summary>
    /// 过期
    /// </summary>
    Expire = 3,

    /// <summary>
    /// 退还
    /// </summary>
    Refund = 4
}