using MiaoJiZhang.Domain.Enums;

namespace MiaoJiZhang.Domain.Entities;

/// <summary>账本（支持多账本/共享账本）</summary>
public class Ledger
{
    public long Id { get; set; }
    public long OwnerId { get; set; }
    public User Owner { get; set; } = null!;
    public string Name { get; set; } = null!;
    public string IconKey { get; set; } = "wallet";
    public bool IsDefault { get; set; }
    public DateTime CreatedAt { get; set; }

    public List<Transaction> Transactions { get; set; } = [];
    public List<Budget> Budgets { get; set; } = [];
}

/// <summary>分类（系统默认分类 UserId 为 null；用户自定义分类挂 UserId）</summary>
public class Category
{
    public long Id { get; set; }
    /// <summary>null = 系统默认分类（后台可管理）</summary>
    public long? UserId { get; set; }
    public TransactionType Type { get; set; }
    public string Name { get; set; } = null!;
    public string IconKey { get; set; } = "tag";
    public string ColorKey { get; set; } = "mint";
    public int SortOrder { get; set; }
    public bool IsDeleted { get; set; }
}

/// <summary>账单</summary>
public class Transaction
{
    public long Id { get; set; }
    public long LedgerId { get; set; }
    public Ledger Ledger { get; set; } = null!;
    public long UserId { get; set; }
    public long CategoryId { get; set; }
    public Category Category { get; set; } = null!;

    public TransactionType Type { get; set; }
    public decimal Amount { get; set; }
    public string? Note { get; set; }
    public string? PaymentMethod { get; set; }
    public DateTime OccurredAt { get; set; }

    // ---- AI 来源追溯（决策：可核对、可撤销） ----
    public TransactionSource Source { get; set; } = TransactionSource.Manual;
    /// <summary>AI 记账时用户的原话（追溯用）</summary>
    public string? SourceText { get; set; }
    /// <summary>关联的聊天消息 Id（追溯用）</summary>
    public long? SourceChatMessageId { get; set; }
    public string? ClientRequestId { get; set; }

    // ---- 软删除（决策：直接入账 + 可撤销） ----
    public bool IsDeleted { get; set; }
    public DateTime? DeletedAt { get; set; }

    public DateTime CreatedAt { get; set; }
    public DateTime UpdatedAt { get; set; }
}

/// <summary>预算（CategoryId 为 null 表示总预算）</summary>
public class Budget
{
    public long Id { get; set; }
    public long LedgerId { get; set; }
    public Ledger Ledger { get; set; } = null!;
    public long UserId { get; set; }
    /// <summary>null = 月度总预算</summary>
    public long? CategoryId { get; set; }
    /// <summary>格式 yyyyMM；0 表示长期生效模板</summary>
    public int Period { get; set; }
    public decimal Amount { get; set; }
}

/// <summary>AI 聊天消息</summary>
public class ChatMessage
{
    public long Id { get; set; }
    public long UserId { get; set; }
    public ChatRole Role { get; set; }
    public ChatMessageType Type { get; set; }
    /// <summary>文本内容 / 表情包 key / 卡片 JSON</summary>
    public string Content { get; set; } = null!;
    /// <summary>该消息产生的账单 Id（BillCard 类型）</summary>
    public long? TransactionId { get; set; }
    public DateTime CreatedAt { get; set; }
}