AiDOPWarehouse/server/Plugins/Admin.NET.Plugin.AiDOP/Infrastructure/AdoS0MfgBomRules.cs

using Admin.NET.Plugin.AiDOP.Dto.S0.Manufacturing;

namespace Admin.NET.Plugin.AiDOP.Infrastructure;

/// <summary>
/// BOM 聚合保存前校验（对齐 Batch3 §9 / §19 题 5 要点，深度成环需结合全库 BOM 图扩展）。
/// </summary>
public static class AdoS0MfgBomRules
{
    public static string? ValidateUpsert(AdoS0MfgBomUpsertDto dto)
    {
        if (dto.Items == null || dto.Items.Count == 0)
            return "BOM 至少包含一行子项";

        var childIds = dto.Items.Select(i => i.MaterialId).ToList();
        if (childIds.Count != childIds.Distinct().Count())
            return "同一 BOM 下子项物料不能重复";

        if (dto.MaterialId.HasValue && childIds.Contains(dto.MaterialId.Value))
            return "父项物料不能同时作为本子项出现";

        foreach (var it in dto.Items)
        {
            if (it.QtyDenominator == 0)
                return "数量分母不能为 0";
        }

        return null;
    }
}