using Forks.EnterpriseServices.BusinessInterfaces;
using Forks.EnterpriseServices.DomainObjects2;
using Forks.EnterpriseServices.DomainObjects2.DQuery;
using Forks.Utils;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web.UI;
using System.Web.UI.WebControls;
using TSingSoft.WebControls2;
using TSingSoft.WebPluginFramework;

namespace BWP.Web.WebControls
{
  public class SelectNamedValueRelationBox<T> : WebControl, INamingContainer
  {
    interface IEditor
    {
      object GetData();
    }

    IEditor mEditor;

    class Editor1<T1> : IEditor
    {
      Type mRelationType;
      string mSelfField;
      long mSelfValue;
      string mOtherField;
      public Editor1(Type relationType, string selfField, long selfValue, string otherField)
      {
        this.mRelationType = relationType;
        this.mSelfField = selfField;
        this.mSelfValue = selfValue;
        this.mOtherField = otherField;
      }

      public object GetData()
      {
        var query = new DQueryDom(new JoinAlias(mRelationType));
        query.Where.Conditions.Add(DQCondition.EQ(mSelfField, mSelfValue));
        query.Columns.Add(DQSelectColumn.Field(mOtherField));
        return query.EExecuteList<NamedValue<T1>>();
      }
    }



    long mSelfValue;
    public SelectNamedValueRelationBox(bool canEdit, Type relationType, string selfField, long selfValue, string otherField)
    {
      CanEdit = canEdit;
      mSelfValue = selfValue;
      mEditor = new Editor1<T>(relationType, selfField, selfValue, otherField);
    }


    class RepeaterTemplate : ITemplate
    {
      public bool CanEdit;

      Label label;
      LinkButton linkButton;

      public void InstantiateIn(Control container)
      {
        label = new Label();
        linkButton = new LinkButton() { Text = "x", Visible = CanEdit };
        container.Controls.Add(linkButton);
        container.Controls.Add(new LiteralControl(" "));
        container.Controls.Add(label);
        container.Controls.Add(new LiteralControl(" "));
        container.DataBinding += new EventHandler(container_DataBinding);
      }

      void container_DataBinding(object sender, EventArgs e)
      {
        var item = (RepeaterItem)sender;
        var dataItem = item.DataItem as NamedValue<T>?;
        label.Text = dataItem.Value.Name;
        linkButton.CommandName = "Delete";
        linkButton.CommandArgument = dataItem.Value.Value.ToString();
      }
    }

    Repeater repeater;

    NamedValueInput<T> box;

    public bool CanEdit;

    protected override void CreateChildControls()
    {
      repeater = new Repeater();
      repeater.ItemTemplate = new RepeaterTemplate() { CanEdit = this.CanEdit };
      Controls.Add(repeater);
      repeater.ItemCommand += (sender, e) =>
      {
        var value = new NamedValue<T>(short.Parse(e.CommandArgument.ToString()));
        using (var context = new TransactionContext())
        {
          DeleteRelationAction(context.Session, mSelfValue, value);
          context.Commit();
        }
        RepeaterDataBind();
      };
      box = new NamedValueInput<T>() { EnableTopItem = true, Width = Unit.Pixel(120) };
      box.AutoPostBack = true;
      box.Visible = CanEdit;
      box.SelectedValueChanged += (sender, e) =>
      {
        if (box.IsEmpty)
        {
          return;
        }

        using (var context = new TransactionContext())
        {
          AddRelationAction(context.Session, mSelfValue, box.Value.Value);
          context.Commit();
        }
        RepeaterDataBind();
        box.Clear();
      };

      Controls.Add(box);
    }

    public Action<IDmoSession, long, NamedValue<T>> AddRelationAction;

    public Action<IDmoSession, long, NamedValue<T>> DeleteRelationAction;

    void RepeaterDataBind()
    {
      EnsureChildControls();
      repeater.DataSource = (IList<NamedValue<T>>)mEditor.GetData();
      repeater.DataBind();
    }

    protected override void OnLoad(EventArgs e)
    {
      base.OnLoad(e);
      if (!Page.IsPostBack)
      {
        RepeaterDataBind();
      }
    }
  }
}