// 场景：表单保存校验（客户非空、分录数量>0）
// 适用：AbstractBillPlugIn 界面保存
// 依赖 API：BeforeDoOperation、Model.GetValue、View.ShowErrMessage
// 相关：enterprise-plugin-shape.md · FormPluginTemplate.cs
//
// 必须：
//   - 事件 BeforeDoOperation（OperateKey=Save）或 BeforeSave
// 禁止：
//   - BeforeExecuteOperationTransaction（操作事务，属操作插件）
//   - OnValidate 等未在 Form 手册中作为保存主路径的事件名

using System;
using System.ComponentModel;
using Kingdee.BOS.Core.Bill.PlugIn;
using Kingdee.BOS.Core.DynamicForm.PlugIn.Args;
using Kingdee.BOS.Orm.DataEntity;
using Kingdee.BOS.Util;

namespace MyCompany.MyProject.BillPlugIn
{
    [Description("保存校验样例"), HotUpdate]
    public class SaveValidateSample : AbstractBillPlugIn
    {
        // Key（GetValue/SetValue）— 以元数据为准
        private const string KEY_CUST = "FCustId";
        private const string KEY_QTY = "FQty";
        private const string KEY_ENTRY = "FSaleOrderEntry";

        public override void BeforeDoOperation(BeforeDoOperationEventArgs e)
        {
            base.BeforeDoOperation(e);
            if (!e.OperateKey.EqualsIgnoreCase("Save"))
                return;

            object cust = this.Model.GetValue(KEY_CUST);
            if (cust == null)
            {
                e.Cancel = true;
                this.View.ShowErrMessage("保存失败：客户不能为空。");
                return;
            }

            int rowCount = this.Model.GetEntryRowCount(KEY_ENTRY);
            if (rowCount <= 0)
            {
                e.Cancel = true;
                this.View.ShowErrMessage("保存失败：分录至少一行。");
                return;
            }

            for (int i = 0; i < rowCount; i++)
            {
                object qtyObj = this.Model.GetValue(KEY_QTY, i);
                decimal qty = qtyObj != null ? Convert.ToDecimal(qtyObj) : 0m;
                if (qty <= 0m)
                {
                    e.Cancel = true;
                    this.View.ShowErrMessage($"保存失败：第 {i + 1} 行数量必须大于 0。");
                    return;
                }
            }
        }
    }
}