using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using VEPROMS.CSLA.Library;

namespace WinApp
{
	public partial class frmGroups : Form
	{
		public frmGroups(int gid)
		{
			InitializeComponent();
			_gid = gid;
		}
		private int _gid;
		private Group _group;
		private void frmGroup_Load(object sender, EventArgs e)
		{
			groupInfoListBindingSource.DataSource = GroupInfoList.Get();
			userInfoListBindingSource.DataSource = UserInfoList.Get();
			lbGroups.SelectedValue = _gid;
			SetupDetail();
			SetupButtons();
		}
		private void BeforeFormClosing(object sender, FormClosingEventArgs e)
		{
			e.Cancel = (SaveAsNeeded() == DialogResult.Cancel);
		}
		private DialogResult SaveAsNeeded()
		{
			if (_group != null && _group.IsSavable)
			{
				DialogResult dr = MessageBox.Show("Do you want to save changes", "Save Changes", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
				if (dr == DialogResult.Yes) Save();
				if (dr == DialogResult.No) Cancel();
				// TODO: Need a Cancel
				return dr;
			}
			return DialogResult.Yes;
		}
		private void SetupDetail()
		{
			if (lbGroups.SelectedValue != null)
			{
				int gid = (int)lbGroups.SelectedValue;
				if (_group == null || _group.GID != gid)
				{
					if (SaveAsNeeded() != DialogResult.Cancel)
					{
						_group = Group.Get(gid);
						groupBindingSource.DataSource = _group;
						groupMembershipsBindingSource.DataSource = _group.GroupMemberships;
						groupAssignmentsBindingSource.DataSource = _group.GroupAssignments;
					}
				}
			}
		}
		private void lbGroup_SelectedValueChanged(object sender, EventArgs e)
		{
			SetupDetail();
		}
		private void SetupButtons()
		{
			if (_group != null)
			{
				btnSave.Enabled = _group.IsSavable;
				btnCancel.Enabled = _group.IsDirty;
				btnNew.Enabled = _group.IsValid;
			}
			else
			{
				btnSave.Enabled = false;
				btnCancel.Enabled = false;
				btnNew.Enabled = true;
			}
		}
		private void CurrentItemChanged(object sender, EventArgs e)
		{
			SetupButtons();
		}
		private void btnCancel_Click(object sender, EventArgs e)
		{
			Cancel();
		}
		private void btnSave_Click(object sender, EventArgs e)
		{
			Save();
		}
		private void btnNew_Click(object sender, EventArgs e)
		{
			New();
		}
		private void Cancel()
		{
			_group.CancelEdit();
			_group.BeginEdit();
		}
		private void Save()
		{
			groupBindingSource.RaiseListChangedEvents = false;
			groupMembershipsBindingSource.RaiseListChangedEvents = false;
			groupBindingSource.EndEdit();
			groupMembershipsBindingSource.EndEdit();

			try
			{
				Group temp = _group.Clone();
				_group = temp.Save();
				_group.BeginEdit();
				groupBindingSource.DataSource = null;
				groupMembershipsBindingSource.DataSource = null;
				int gid = _group.GID;
				groupInfoListBindingSource.DataSource = GroupInfoList.Get();
				lbGroups.SelectedValue = gid;
				groupBindingSource.DataSource = _group;
				groupMembershipsBindingSource.DataSource = _group.GroupMemberships;
			}
			catch (Csla.DataPortalException ex)
			{
				MessageBox.Show(ex.BusinessException.ToString(),
				"Error saving", MessageBoxButtons.OK,
				MessageBoxIcon.Exclamation);
			}
			catch (Exception ex)
			{
				MessageBox.Show(ex.ToString(), "Error saving",
				MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
			}
			finally
			{
				groupBindingSource.RaiseListChangedEvents = true;
				groupMembershipsBindingSource.RaiseListChangedEvents = true;
				groupBindingSource.ResetBindings(false);
				groupMembershipsBindingSource.ResetBindings(false);
			}
			SetupButtons();
		}
		public void New()
		{
			if (SaveAsNeeded() != DialogResult.Cancel)
			{
				_group = Group.New();
				groupBindingSource.DataSource = _group;
				groupMembershipsBindingSource.DataSource = _group.GroupMemberships;
			}
		}
		private void btnNewGA_Click(object sender, EventArgs e)
		{
			using (frmUserSelect f = new frmUserSelect())
			{
				f.ShowDialog();
				if (f.DialogResult == DialogResult.OK)
				{
					_group.GroupMemberships.Add(User.Get(f.UID));   // KBR using?
					SetupButtons();
				}
			}
		}
		private void btnRemoveGA_Click(object sender, EventArgs e)
		{
			if (this.groupMembershipsDataGridView.SelectedRows.Count > 0)
			{
				int uid = int.Parse(
					this.groupMembershipsDataGridView.SelectedRows[0].Cells[0].Value.ToString());
				MessageBox.Show("Conversion error");
				//TODO KBR: _group.GroupMemberships.Remove(uid);
			}
		}

		private void btnRemoveAssign_Click(object sender, EventArgs e)
		{
			if (this.groupAssignmentsDataGridView.SelectedRows.Count > 0)
			{
				int rid = int.Parse(
					this.groupAssignmentsDataGridView.SelectedRows[0].Cells[1].Value.ToString());
				int folderid = int.Parse(
					this.groupAssignmentsDataGridView.SelectedRows[0].Cells[2].Value.ToString());
				MessageBox.Show("Conversion error");
				//TODO KBR: _group.GroupAssignments.Remove(folderid, rid);
			}

		}

		private void btnNewAssign_Click(object sender, EventArgs e)
		{
			using (frmAssignmentSelect f = new frmAssignmentSelect(_group))
			{
				f.ShowDialog();
				if (f.DialogResult == DialogResult.OK)
				{
					//TODO: Do I need to refresh Assignments?
				}
			}
		}
	}
}