namespace PowderCoating.Core.Entities;

/// <summary>
/// Records actual powder consumption against a specific coat on a job.
/// Links the InventoryTransaction (the deduction) to the JobItemCoat (what the powder was used on).
/// This is the bridge that enables prediction vs actual reporting per powder SKU.
/// </summary>
public class PowderUsageLog : BaseEntity
{
    public int JobId { get; set; }
    public int JobItemId { get; set; }
    public int JobItemCoatId { get; set; }
    public int? InventoryItemId { get; set; }           // null for custom/vendor powder
    public int? InventoryTransactionId { get; set; }    // FK to the inventory deduction (if auto-linked)

    public decimal ActualLbsUsed { get; set; }
    public decimal EstimatedLbs { get; set; }           // Snapshot of PowderToOrder at time of recording
    public decimal VarianceLbs { get; set; }            // ActualLbsUsed - EstimatedLbs (positive = used more than estimated)

    public string RecordedByUserId { get; set; } = string.Empty;
    public DateTime RecordedAt { get; set; } = DateTime.UtcNow;
    public string? Notes { get; set; }

    // Navigation
    public virtual Job Job { get; set; } = null!;
    public virtual JobItem JobItem { get; set; } = null!;
    public virtual JobItemCoat JobItemCoat { get; set; } = null!;
    public virtual InventoryItem? InventoryItem { get; set; }
    public virtual InventoryTransaction? InventoryTransaction { get; set; }
}