namespace AgriculturalPlatform.Api.Models;

/// <summary>农产品反向开票（收购发票：收购方向农户开具）</summary>
public class Invoice
{
    public int Id { get; set; }

    /// <summary>发票号码（如 FP20260812-0001）</summary>
    public string InvoiceNo { get; set; } = string.Empty;

    /// <summary>开票批次号（批量开票时同一批共用）</summary>
    public string BatchNo { get; set; } = string.Empty;

    /// <summary>票种：农产品收购发票</summary>
    public string InvoiceKind { get; set; } = "农产品收购发票";

    /// <summary>销售方（农户）</summary>
    public int FarmerId { get; set; }

    public Farmer? Farmer { get; set; }

    /// <summary>收购方（公司/站/个体）</summary>
    public int PurchaserOrgId { get; set; }

    public Organization? PurchaserOrg { get; set; }

    /// <summary>关联收购单（可空）</summary>
    public int? PurchaseOrderId { get; set; }

    public PurchaseOrder? PurchaseOrder { get; set; }

    /// <summary>品名（冗余，便于发票展示）</summary>
    public int ProductId { get; set; }

    public Product? Product { get; set; }

    /// <summary>数量</summary>
    public decimal Quantity { get; set; }

    public string Unit { get; set; } = "公斤";

    public decimal UnitPrice { get; set; }

    /// <summary>价税合计（元）</summary>
    public decimal Amount { get; set; }

    /// <summary>税率（%），农产品收购发票免税为 0</summary>
    public decimal TaxRate { get; set; } = 0m;

    public decimal TaxAmount { get; set; }

    public DateTime IssueDate { get; set; } = DateTime.Now;

    public InvoiceStatus Status { get; set; } = InvoiceStatus.Issued;

    /// <summary>开票人</summary>
    public int? OperatorId { get; set; }

    public User? Operator { get; set; }

    public DateTime? ReversedAt { get; set; }

    public string ReverseReason { get; set; } = string.Empty;

    public DateTime CreatedAt { get; set; } = DateTime.Now;
}