first commit

RS_system/Models/ViewModels/RegistroCultoViewModel.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace Rs_system.Models.ViewModels;
+
+/// <summary>
+/// ViewModel for creating/editing offering records
+/// </summary>
+public class RegistroCultoViewModel
+{
+    public long? Id { get; set; }
+    
+    [Required(ErrorMessage = "La fecha es requerida")]
+    [Display(Name = "Fecha del Culto")]
+    [DataType(DataType.Date)]
+    public DateOnly Fecha { get; set; } = DateOnly.FromDateTime(DateTime.Today);
+    
+    [Display(Name = "Observaciones")]
+    [StringLength(500, ErrorMessage = "Las observaciones no pueden exceder 500 caracteres")]
+    public string? Observaciones { get; set; }
+    
+    public List<OfrendaItemViewModel> Ofrendas { get; set; } = new();
+    
+    // Calculated properties for display
+    public decimal TotalOfrendas => Ofrendas?.Sum(o => o.Monto) ?? 0;
+    public decimal TotalDescuentos => Ofrendas?.Sum(o => o.TotalDescuentos) ?? 0;
+    public decimal MontoNeto => TotalOfrendas - TotalDescuentos;
+}
+
+/// <summary>
+/// ViewModel for an individual offering
+/// </summary>
+public class OfrendaItemViewModel
+{
+    public long? Id { get; set; }
+    
+    [Required(ErrorMessage = "El monto es requerido")]
+    [Display(Name = "Monto")]
+    [Range(0.01, 999999.99, ErrorMessage = "El monto debe ser mayor a 0")]
+    [DataType(DataType.Currency)]
+    public decimal Monto { get; set; }
+    
+    [Required(ErrorMessage = "El concepto es requerido")]
+    [Display(Name = "Concepto")]
+    [StringLength(200, ErrorMessage = "El concepto no puede exceder 200 caracteres")]
+    public string Concepto { get; set; } = string.Empty;
+    
+    public List<DescuentoItemViewModel> Descuentos { get; set; } = new();
+    
+    // Calculated properties
+    public decimal TotalDescuentos => Descuentos?.Sum(d => d.Monto) ?? 0;
+    public decimal MontoNeto => Monto - TotalDescuentos;
+}
+
+/// <summary>
+/// ViewModel for a deduction from an offering
+/// </summary>
+public class DescuentoItemViewModel
+{
+    public long? Id { get; set; }
+    
+    [Required(ErrorMessage = "El monto es requerido")]
+    [Display(Name = "Monto")]
+    [Range(0.01, 999999.99, ErrorMessage = "El monto debe ser mayor a 0")]
+    [DataType(DataType.Currency)]
+    public decimal Monto { get; set; }
+    
+    [Required(ErrorMessage = "El concepto es requerido")]
+    [Display(Name = "Concepto")]
+    [StringLength(200, ErrorMessage = "El concepto no puede exceder 200 caracteres")]
+    public string Concepto { get; set; } = string.Empty;
+}