using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Sarand.Core.Bus;
using Sarand.PatientMgr.Core.Bus;
using Sarand.Win.Forms.Utils;
using Sarand.Core.Base;
using Sarand.PatientMgr.Core.App;
using Sarand.PatientMgr.Win.Forms.Maint;
using Sarand.PatientMgr.Win.Forms.Controls;
using Sarand.PatientMgr.Win.Forms.TabPages;
using Sarand.PatientMgr.Win.Forms.Filters;
using Sarand.PatientMgr.Win.Forms.Base;

namespace Sarand.PatientMgr.Win.Forms.Panels
{
	//=======================================================================
	public partial class SpmPanel_Employees : SpmPanel_Items
	{
		//-------------------------------------------------------------------
		// Configuration.
		public enum PanelMode
		{
			Search,
			Maintain,
		}
		public new class Config : SpmPanel_Items.Config
		{
			public Config (PanelMode mode)
			{
				Mode = mode;
				// Defaults based on mode.
				DisplayFilter = false; // Mode == PanelMode.Maintain || Mode == PanelMode.Search;
				DisplayTabs = Mode == PanelMode.Maintain;
				DisplayActionButtons = Mode == PanelMode.Maintain;
				DisplayNavigationButtons = Mode == PanelMode.Search;
			}
			public PanelMode Mode { get; } = PanelMode.Maintain;
			public SpmForm SearchForm { get; set; }
			// Display options.
			public bool DisplayFilter { get; set; } = false;
			public bool DisplayContextMenu { get; set; } = true;
			public bool DisplayActionButtons { get; set; } = false;
			public bool DisplayNavigationButtons { get; set; } = false;
			public bool DisplayTabs { get; set; } = false;
		}

		//-------------------------------------------------------------------
		// Data members.
		private Config config = new Config(PanelMode.Search);
		private readonly List<SpmTabPage_Employee> tabPages = new List<SpmTabPage_Employee>();

		//-------------------------------------------------------------------
		// Construction.
		private SpmPanel_Employees () : this(new Config(PanelMode.Search)) { }
		public SpmPanel_Employees (Config config) : base(config)
		{
			this.config = config;
			InitializeComponent();
		}
		protected override void Dispose (bool disposing)
		{
			if (disposing)
			{
				if (components != null) components.Dispose();
			}
			base.Dispose(disposing);
		}

		//-------------------------------------------------------------------
		// Properties.
		protected override String DefaultMessageTitle { get { return "Employee"; } }
		public override int ItemTotal { get { return listViewEmployee.ItemTotal; } }
		public override int ItemCount { get { return listViewEmployee.ItemCount; } }
		public override int SelectedItemCount { get { return listViewEmployee.SelectedItemCount; } }
		public SysId SelectedItemId { get { return listViewEmployee.SelectedItemId; } }
		public List<SysId> SelectedItemIds { get { return listViewEmployee.SelectedItemIds; } }
		public SpmEmployee SelectedEmployee { get { return listViewEmployee.SelectedEmployee; } }

		//-------------------------------------------------------------------
		// Configure.
		public void SetConfig (Config config)
		{
			base.SetConfig(config);
			this.config = config;
			ConfigurePanel();
		}

		//-------------------------------------------------------------------
		//                    I n i t i a l i s a t i o n
		//-------------------------------------------------------------------
		protected override void OnCreateControl ()
		{
			base.OnCreateControl();
			if (this.IsDesignerHosted()) return;

			ConfigurePanel();
		}

		private void ConfigurePanel ()
		{
			if (!Created || this.IsDesignerHosted()) return;

			// Configure filter.
			if (config.DisplayFilter)
			{
				SpmItemListFilter_Employee.Config configFilter = new SpmItemListFilter_Employee.Config();
				configFilter.Internals = Internals;
				listFilterEmployee.SetConfig(configFilter);
			}
			listFilterEmployee.Visible = config.DisplayFilter;

			// Configure list.
			SpmItemListView_Employee.Config configList = new SpmItemListView_Employee.Config();
			configList.Internals = Internals;
			configList.Mode = SpmItemListView_Employee.ListMode.General;
			listViewEmployee.SetConfig(configList);

			// Tabs.
			tabControl.TabPages.Clear();
			tabControl.Visible = config.DisplayTabs;
			RefreshTabs();

			// Configure buttons.
			buttonCreate.Visible = config.DisplayActionButtons && SecurityProfile.Admin.CanManageConfig();
			buttonUpdate.Visible = config.DisplayActionButtons;
			buttonRemove.Visible = config.DisplayActionButtons && buttonCreate.Visible;
			buttonOk.Visible = config.DisplayNavigationButtons && config.Mode == PanelMode.Search;
			buttonCancel.Visible = config.DisplayNavigationButtons;

			// Complete form initialisation.
			RefreshDataItems();
			SetControlActivity();
			PositionControls();
		}

		//-------------------------------------------------------------------
		// Initialise tabs.
		private void InitTabs ()
		{
			String fn = GetType().Name + ".InitTabs";
			tabControl.TabPages.Clear();
			tabPages.Clear();
			if (!config.DisplayTabs)
			{
				tabPages.Clear();
				tabControl.TabPages.Clear();
				tabControl.Visible = false;
				return;
			}

			// Selected Employee.
			SpmEmployee employee = SelectedEmployee;

			// Updates.
			List<SpmTabPage_Employee.PanelType> panelTypes_Updates = new List<SpmTabPage_Employee.PanelType>();
			panelTypes_Updates.Add(SpmTabPage_Employee.PanelType.Updates);
			if (panelTypes_Updates.Count > 0)
			{
				SpmTabPage_Employee.Config configTabPage = new SpmTabPage_Employee.Config();
				configTabPage.Internals = Internals;
				configTabPage.ReadOnly = ReadOnly;
				configTabPage.PanelTypes.AddRange(panelTypes_Updates);
				SpmTabPage_Employee tabPage = new SpmTabPage_Employee(configTabPage) { Text = "Updates" };
				tabPages.Add(tabPage);
			}

			// Populate tab pages.
			tabControl.Visible = tabPages.Count > 0;
			foreach (var tabPage in tabPages)
				tabControl.TabPages.Add(tabPage);
		}

		//-------------------------------------------------------------------
		//                   P a n e l   I n t e r f a c e
		//-------------------------------------------------------------------
		private String previouslySelectedTabPageText = "";
		private void RefreshTabs ()
		{
			if (tabControl.SelectedTab != null)
				previouslySelectedTabPageText = tabControl.SelectedTab.Text;

			// Reinitialise tabs whenever the selection changes in case the set of tab pages displayed needs to be changed.
			InitTabs();

			// Select previous tab page if still present.
			if (!StringUtil.IsEmpty(previouslySelectedTabPageText))
			{
				foreach (TabPage tabPage in tabControl.TabPages)
				{
					if (tabPage.Text.Equals(previouslySelectedTabPageText))
					{
						tabControl.SelectTab(tabPage);
						break;
					}
				}
			}
			RefreshTabPages();

			SetControlActivity();
			PositionControls();
		}
		private void RefreshTabPages ()
		{
			// Selected Employee - populated when needed.
			SpmEmployee employee = null;

			// Refresh tabs.
			if (tabControl.Visible)
			{
				if (employee == null) employee = SelectedEmployee;
				SpmEmployee.Data employeeData = employee != null ? employee.GetData() : new SpmEmployee.Data();
				tabPages.PopulateToControls(employeeData);
			}
		}

		//-------------------------------------------------------------------
		//                            F i l t e r
		//-------------------------------------------------------------------
		public bool ParamsAreValid (SpmEmployee.Params prmEmployee)
		{
			return true;
		}
		public SpmEmployee.Params GetParams ()
		{
			SpmEmployee.Params prmEmployee = new SpmEmployee.Params();

			// Sort columns.
			prmEmployee.SortColumns.AddRange(listViewEmployee.GetSortColumns());
			return prmEmployee;
		}

		//-------------------------------------------------------------------
		//                           A c t i o n s
		//-------------------------------------------------------------------
		// Refresh.
		public override void RefreshDataItems ()
		{
			SpmEmployee.Params prmEmployee = GetParams();
			if (!ParamsAreValid(prmEmployee)) prmEmployee = null;
			listViewEmployee.RefreshEmployees(prmEmployee);
		}
		public override void RefreshDataItem (SysId id)
		{
			listViewEmployee.RefreshEmployee(id);
		}
		public override void RemoveDataItem (SysId id)
		{
			listViewEmployee.RemoveItemById(id);
		}

		//-------------------------------------------------------------------
		// Create item.
		public override bool CanCreateItem ()
		{
			if (ReadOnly) return false;
			if (!SecurityProfile.Admin.CanManageConfig()) return false;
			return true;
		}
		public override void CreateItem ()
		{
			if (!CanCreateItem()) return;
			if (config.Mode == PanelMode.Search) return;
			// Create new Employee.
			SpmForm_Employee.Config configEmployee = new SpmForm_Employee.Config();
			using (var form = new SpmForm_Employee(configEmployee))
			{
				if (form.ShowDialog() == DialogResult.OK)
				{
					RefreshDataItem(form.NewItemId);
					InvokeItemCreatedEvent(Spm.DataItemType.Employee, form.NewItemId);
				}
			}
		}

		//-------------------------------------------------------------------
		// View/Update item.
		public override bool CanViewItem ()
		{
			return true;
		}
		public override bool CanUpdateItem ()
		{
			if (ReadOnly) return false;
			if (!SecurityProfile.Admin.CanManageConfig()) return false;
			return true;
		}
		public override void UpdateItem (bool updateItem = true)
		{
			if (config.Mode == PanelMode.Search) return;
			SpmEmployee employee = SelectedEmployee;
			if (SelectedItemCount != 1) return;
			if (!CanUpdateItem() && !CanViewItem()) return;
			if (!CanUpdateItem()) updateItem = false;
			if (employee == null)
			{
				MessageConsole.ShowMessageWarning("Failed to retrieve selected item");
				return;
			}
			SpmForm_Employee.Config configEmployee = new SpmForm_Employee.Config();
			configEmployee.EmployeeToUpdate = employee;
			configEmployee.ReadOnly = (config.ReadOnly || !updateItem);
			using (SpmForm_Employee formEmployee = new SpmForm_Employee(configEmployee))
			{
				// Perform the update.
				if (formEmployee.ShowDialog() == DialogResult.OK)
				{
					// Employee has been updated.
					RefreshDataItem(employee.Id);
					listViewEmployee.RefreshEmployee(employee.Id);
					InvokeItemUpdatedEvent(Spm.DataItemType.Employee, employee.Id);
				}
			}
		}

		//-------------------------------------------------------------------
		// Delete item.
		public override bool CanDeleteItem ()
		{
			if (ReadOnly) return false;
			if (!SecurityProfile.Admin.CanManageConfig()) return false;
			return true;
		}
		public override void DeleteItem ()
		{
			if (!CanDeleteItem()) return;
			if (config.Mode == PanelMode.Search) return;
			if (SelectedItemCount != 1) return;
			SpmEmployee employee = SelectedEmployee;
			if (employee == null)
			{
				MessageConsole.ShowMessageWarning("Failed to retrieve item for deletion.");
				return;
			}
			if (!InstitutionMgr.EmployeeCanBeDeleted(employee))
			{
				MessageConsole.ShowMessageError("Unable to remove employee - " + InstitutionMgr.ErrorStateMessage + ".");
				return;
			}
			if (MessageConsole.ShowMessageConfirm("Are you sure that this employee should be removed from the system?"))
			{
				if (InstitutionMgr.DeleteEmployee(employee, DbUpdateInfo))
				{
					int selectIdx = listViewEmployee.SelectedIndex;
					listViewEmployee.RemoveItemById(employee.Id.ToString());
					if (selectIdx >= listViewEmployee.ItemCount - 1) selectIdx--;
					listViewEmployee.SelectedIndices.Clear();
					listViewEmployee.SelectedIndices.Add(selectIdx);
				}
				else MessageConsole.ShowMessageError("Failed to remove employee - " + InstitutionMgr.ErrorStateMessage + ".");
			}
		}

		//-------------------------------------------------------------------
		// Import data.
		public override bool CanImportData ()
		{
			return false;
		}
		public override void ImportData ()
		{
			if (!CanImportData()) return;
		}

		//-------------------------------------------------------------------
		// Export data.
		public override bool CanExportData ()
		{
			return false;
		}
		public override void ExportData ()
		{
		}

		//-------------------------------------------------------------------
		//                      C o n t e x t   M e n u
		//-------------------------------------------------------------------
		private SpmContextMenuStrip contextMenuStrip = new SpmContextMenuStrip();
		private void RefreshContextMenu ()
		{
			contextMenuStrip.Name = "Employee";
			contextMenuStrip.Items.Clear();
			if (CanCreateItem())
				contextMenuStrip.Items.Add("Create", null, CreateItem);
			if (SysId.IsValid(listViewEmployee.SelectedItemId))
			{
				SpmEmployee employee = SelectedEmployee;
				if (employee != null)
				{
					if (CanUpdateItem() || CanDeleteItem())
					{
						if (contextMenuStrip.Items.Count > 0)
							contextMenuStrip.Items.Add(new ToolStripSeparator());
						contextMenuStrip.Items.Add(CanUpdateItem() ? "Update" : "View", null, UpdateItem);
						if (CanDeleteItem())
							contextMenuStrip.Items.Add("Remove", null, DeleteItem);
					}
				}
			}
			if (CanExportData() || CanImportData())
			{
				if (contextMenuStrip.Items.Count > 0)
					contextMenuStrip.Items.Add(new ToolStripSeparator());
				if (CanImportData())
					contextMenuStrip.Items.Add("Import", null, ImportData);
				if (CanExportData())
					contextMenuStrip.Items.Add("Export", null, ExportData);
			}
		}

		//-------------------------------------------------------------------
		//                  C o n t r o l   A c t i v i t y
		//-------------------------------------------------------------------
		protected override void SetControlActivity ()
		{
			SetControlsReadOnly();
			bool itemSelected = SysId.IsValid(SelectedItemId);

			listViewEmployee.Enabled = Enabled;
			buttonCreate.Enabled = Enabled;
			buttonUpdate.Enabled = Enabled && itemSelected;
			buttonRemove.Enabled = Enabled && itemSelected;
			buttonOk.Enabled = Enabled;
			buttonCancel.Enabled = Enabled;
		}
		protected override void SetControlsReadOnly ()
		{
		}

		//-------------------------------------------------------------------
		//                 P o s i t i o n   C o n t r o l s
		//-------------------------------------------------------------------
		protected override void PositionControls ()
		{
			if (this.IsDesignerHosted() || !Created) return;
			Rectangle clientRect = ClientRectangle;

			//---------------------------------------------------------------
			// Filter panel.
			if (listFilterEmployee.Visible)
			{
				listFilterEmployee.PositionAtTopLeftOf(this);
				listFilterEmployee.SetFullWidthOf(this);
				listFilterEmployee.ResizeToBottomControl();
				listViewEmployee.PositionBelow(listFilterEmployee);
			}
			else
			{
				listViewEmployee.PositionAtTopLeftOf(this);
			}

			//---------------------------------------------------------------
			// List view.
			int buttonLeft = clientRect.Width - buttonCreate.Width - buttonCreate.Margin.Right - Padding.Right;
			listViewEmployee.Left = listViewEmployee.Margin.Left;
			listViewEmployee.Width = buttonLeft - buttonCreate.Margin.Left - listViewEmployee.Left - listViewEmployee.Margin.Right;
			if (!(buttonCreate.Visible || buttonUpdate.Visible || buttonRemove.Visible || buttonOk.Visible || buttonCancel.Visible))
				listViewEmployee.Width = clientRect.Width - Padding.Right - listViewEmployee.Left - listViewEmployee.Margin.Right;

			//---------------------------------------------------------------
			// Tab control.
			if (tabControl.Visible)
			{
				tabControl.Left = listViewEmployee.Left;
				tabControl.Width = clientRect.Width - (tabControl.Left * 2);
				listViewEmployee.Height = (int)((clientRect.Height - listViewEmployee.Top) * 0.40);
				tabControl.Top = listViewEmployee.Bottom + listViewEmployee.Margin.Bottom + tabControl.Margin.Top;
				tabControl.Height = clientRect.Height - tabControl.Top - tabControl.Margin.Bottom - Padding.Bottom;
			}
			else
			{
				listViewEmployee.Height = clientRect.Height - listViewEmployee.Top - listViewEmployee.Margin.Bottom - Padding.Bottom;
			}

			//---------------------------------------------------------------
			// Create button.
			int buttonTop = listViewEmployee.Top + listViewEmployee.HeaderHeight;
			buttonCreate.Top = buttonTop;
			buttonCreate.Left = buttonLeft;
			if (buttonCreate.Visible)
				buttonTop += buttonCreate.Height + buttonCreate.Margin.Bottom;

			// Update button.
			buttonUpdate.Top = buttonTop;
			buttonUpdate.Left = buttonLeft;
			if (buttonUpdate.Visible)
				buttonTop += buttonUpdate.Height + buttonUpdate.Margin.Bottom;

			// Remove button.
			buttonRemove.Top = buttonTop;
			buttonRemove.Left = buttonLeft;
			if (buttonRemove.Visible)
				buttonTop += buttonRemove.Height + buttonRemove.Margin.Bottom;

			//---------------------------------------------------------------
			// Navigation buttons.
			// Cancel  button.
			buttonCancel.Top = clientRect.Bottom - Padding.Bottom - buttonCancel.Margin.Bottom - buttonCancel.Height;
			buttonCancel.Left = buttonLeft;

			// OK button.
			buttonOk.Top = buttonCancel.Top - buttonOk.Height - buttonCancel.Padding.Top - buttonCancel.Margin.Bottom;
			buttonOk.Left = buttonLeft;
			if (buttonOk.Visible)
				buttonTop += buttonOk.Height + buttonOk.Margin.Bottom;

			//---------------------------------------------------------------
		}

		//-------------------------------------------------------------------
		//                      P a n e l   E v e n t s
		//-------------------------------------------------------------------
		// Filter.
		private void listFilterEmployee_FilterChanged (object sender, EventArgs e)
		{
			RefreshDataItems();
			SetControlActivity();
		}

		//-------------------------------------------------------------------
		// Item list.
		private void listViewEmployee_ColumnClick (object sender, ColumnClickEventArgs e)
		{
			RefreshDataItems();
		}
		private void listViewEmployee_ItemCountChanged (object sender, Sarand.Win.Forms.Controls.SacsListView.ItemCountChangedEventArgs e)
		{
			InvokeItemCountChangedEvent(e);
		}
		private void listViewEmployee_SelectedIndexChanged (object sender, EventArgs e)
		{
			RefreshTabs();
			InvokeItemSelectionChangedEvent(e);
			SetControlActivity();
		}
		private void listViewEmployee_DoubleClick (object sender, EventArgs e)
		{
			if (config.Mode == PanelMode.Search)
			{
				//if (config.SearchForm != null) config.SearchForm.OnOK();
			}
			else
				UpdateItem();
			SetControlActivity();
		}
		private void listViewEmployee_MouseUp (object sender, MouseEventArgs e)
		{
			switch (e.Button)
			{
				case MouseButtons.Right:
					// Refresh the context menu and display at pointer position.
					RefreshContextMenu();
					contextMenuStrip.Show(listViewEmployee, new Point(e.X, e.Y), ToolStripDropDownDirection.Default);
					break;
			}
			SetControlActivity();
		}

		//-------------------------------------------------------------------
		// Actions.
		private void buttonCreate_Click (object sender, EventArgs e)
		{
			CreateItem();
			SetControlActivity();
		}
		private void buttonUpdate_Click (object sender, EventArgs e)
		{
			UpdateItem();
			SetControlActivity();
		}
		private void buttonRemove_Click (object sender, EventArgs e)
		{
			DeleteItem();
			SetControlActivity();
		}
		private void buttonOk_Click (object sender, EventArgs e)
		{
			if (config.SearchForm != null)
			{
				//config.SearchForm.OnOK();
				return;
			}
			SetControlActivity();
		}
		private void buttonCancel_Click (object sender, EventArgs e)
		{
			if (config.SearchForm != null)
			{
				//config.SearchForm.OnCancel();
				return;
			}
			SetControlActivity();
		}

		//-------------------------------------------------------------------
	}
	//=======================================================================
}