using System;
using System.Collections.Generic;
using System.Data.Common;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Sarand.Core.App;
using Sarand.Core.Base;
using Sarand.Core.Bus;
using Sarand.Core.Dbas.Base;
using Sarand.Win.Dbas.Base;
using Sarand.PatientMgr.Core.App;
using Sarand.PatientMgr.Core.Bus;
using Sarand.PatientMgr.Core.Mgr;
using Sarand.PatientMgr.Win.Dbas.Bus;
using Sarand.PatientMgr.Win.Dbas.Internal;
//using Sarand.PatientMgr.Win.Dbas.UpdateLog;
using Sarand.Win.Dbas.Data;

namespace Sarand.PatientMgr.Win.Dbas.Mgr
{
	//=======================================================================
	internal partial class SpmInstitutionMgr_Dbas : SpmInstitutionMgr
	{
		//*******************************************************************
		//                          E m p l o y e e
		//*******************************************************************
		// Utilities.

		//-------------------------------------------------------------------
		// Create Employee.
		public override SpmEmployee CreateEmployee(SysId id, SysId institutionId)
		{
			return new SpmEmployee_Dbas(UserContext, id, institutionId, 0);
		}
		private SpmEmployee_Dbas CreateEmployee(SwmEmployee_Db dbEmployee)
		{
			ClearErrorState();
			SpmEmployee_Dbas employee = new SpmEmployee_Dbas(UserContext, new SysId(dbEmployee._Id), new SysId(dbEmployee._InstitutionId), (ushort)dbEmployee._Flags);
			PopulateFrom(dbEmployee, employee);
			return employee;
		}

		//-------------------------------------------------------------------
		// Get Employee.
		public override SpmEmployee GetEmployee(SpmEmployee.Params prm)
		{
			return GetEmployee(GetEmployeeQueryFilter(prm).Concat(" AND ", "(", ")"));
		}
		private SpmEmployee GetEmployee(String filter)
		{
			ClearErrorState();
			long count = GetEmployeeCount(filter);
			if (count == 0) return null;
			if (count != 1)
			{
				SetErrorState("Multiple Employeees found");
				return null;
			}
			SpmEmployee employee = null;
			// Query data.
			using (var dbConnection = Database.CreateConnection())
			using (var dbCommand = dbConnection.CreateCommand())
			{
				try
				{
					dbConnection.Open();
					SwmEmployee_Db dbEmployee = new SwmEmployee_Db(DbInfo);
					dbEmployee.PopulateFrom(dbCommand, aliasEmployee, filter);
					employee = CreateEmployee(dbEmployee);
				}
				catch (Exception exc)
				{
					SetErrorState("Database query exception");
					Logger.Warn(GetType().Name + ".GetEmployee\n\tQuery: " + dbCommand.CommandText + "\n\tException: " + exc.Message);
				}
			}
			return employee;
		}

		//-------------------------------------------------------------------
		// Validate Employee.
		public override bool IsValidEmployeeData(SpmEmployee.Data data, SpmEmployee.ErrField errField)
		{
			ClearErrorState();
			if (!base.IsValidEmployeeData(data, errField)) return false;
			return true;
		}

		//-------------------------------------------------------------------
		// Insert Employee.
		public override bool InsertEmployee(SpmEmployee employee, DbUpdateInfo dbUpdateInfo)
		{
			ClearErrorState();
			if (!IsValidEmployee(employee)) return false;
			if (SysId.IsValid(employee.Id)) return SetErrorState(ErrorMessage.ValiditemId);
			using (var dbConnection = Database.CreateConnection())
			using (var dbCommand = dbConnection.CreateCommand())
			{
				try
				{
					dbConnection.Open();
					SwmEmployee_Db dbEmployee = new SwmEmployee_Db(DbInfo);
					PopulateTo(dbEmployee, employee, dbUpdateInfo);
					if (SwmEmployee_Db.FieldsNonId.Contains("Id"))
					{
						// Generate next Id.
						dbEmployee._Id = SysId.ToInt(Database.GetNextId("Employee", dbUpdateInfo));
					}
					dbEmployee.ExecuteInsertCommand(dbCommand);
					employee.Id = new SysId(dbEmployee._Id);
				}
				catch (Exception exc) { SetErrorState(exc.Message); }
			}
			return !HasErrorState();
		}

		//-------------------------------------------------------------------
		// Update Employee.
		public override bool UpdateEmployee(SpmEmployee employee, DbUpdateInfo dbUpdateInfo)
		{
			ClearErrorState();
			if (!IsValidEmployee(employee)) return false;
			if (!SysId.IsValid(employee.Id)) return SetErrorState(ErrorMessage.InvalidItemId);
			using (var dbConnection = Database.CreateConnection())
			using (var dbCommand = dbConnection.CreateCommand())
			{
				try
				{
					// Retrieve Employee.
					dbConnection.Open();
					SwmEmployee_Db dbEmployee = new SwmEmployee_Db(DbInfo);
					dbEmployee.PopulateFrom(dbCommand, aliasEmployee, "Id=" + SysId.ToString(employee.Id));
					//SpmUpdateLogItemMonitor_Employee updateLogMonitor = new SpmUpdateLogItemMonitor_Employee(UserContext, CreateEmployee(dbEmployee));

					// Update properties.
					PopulateTo(dbEmployee, employee, dbUpdateInfo);
					dbEmployee.ExecuteUpdateCommand(dbCommand);

					/* Record updates.
					updateLogMonitor.RecordUpdatedValues(employee);
					updateLogMonitor.LogUpdates();*/
				}
				catch (Exception exc) { SetErrorState(exc.Message); }
			}
			return !HasErrorState();
		}

		//-------------------------------------------------------------------
		// Delete Employee.
		public override bool EmployeeCanBeDeleted(SpmEmployee employee)
		{
			ClearErrorState();
			if (!base.EmployeeCanBeDeleted(employee)) return false;
			return true;
		}
		public override bool DeleteEmployee(SpmEmployee employee, DbUpdateInfo dbUpdateInfo)
		{
			ClearErrorState();
			if (!EmployeeCanBeDeleted(employee)) return false;
			using (var dbConnection = Database.CreateConnection())
			using (var dbCommand = dbConnection.CreateCommand())
			{
				try
				{
					// Retrieve Employee.
					dbConnection.Open();
					SwmEmployee_Db dbEmployee = new SwmEmployee_Db(DbInfo);
					dbEmployee.PopulateFrom(dbCommand, aliasEmployee, "Id=" + employee.Id.ToString());
					// Delete Employee.
					dbCommand.CommandType = System.Data.CommandType.Text;
					dbCommand.CommandText = "DELETE FROM " + SpmDbDfn.GetTableName(SpmDbDfn.TableIdx.SwmEmployee) + " WHERE Id=" + SysId.ToString(employee.Id) + ";";
					dbCommand.ExecuteNonQuery();
				}
				catch (Exception exc) { SetErrorState(exc.Message); }
			}
			return !HasErrorState();
		}

		//-------------------------------------------------------------------
		// Copy data properties to and from database.
		private void PopulateTo(SwmEmployee_Db dbEmployee, SpmEmployee employee, DbUpdateInfo dbUpdateInfo)
		{
			dbEmployee._Id = employee.Id.ToInt();
			dbEmployee._EmployeeNo = employee.EmployeeNo;
			dbEmployee._Code = employee.Code;
			dbEmployee._Initials = employee.Initials;
			dbEmployee._Title = employee.Title;
			dbEmployee._Surname = employee.Surname;
			dbEmployee._Forename = employee.Forename;

			dbEmployee._Notes = employee.Notes;
			dbEmployee._Status = SacsSystem.GetStatusCode(employee.Status);
			dbEmployee._Flags = (short)employee.Flags;
			if (!SysId.IsValid(employee.Id))
			{
				dbEmployee._CreateOn = DateTime.UtcNow;
				dbEmployee._CreateBy = dbUpdateInfo.UserId.ToInt();
				dbEmployee._CreateHost = dbUpdateInfo.Host;
			}
			dbEmployee._UpdateOn = DateTime.UtcNow;
			dbEmployee._UpdateBy = dbUpdateInfo.UserId.ToInt();
			dbEmployee._UpdateHost = dbUpdateInfo.Host;
		}
		private void PopulateFrom(SwmEmployee_Db dbEmployee, SpmEmployee employee)
		{
			employee.Id = new SysId(dbEmployee._Id);
			employee.EmployeeNo = dbEmployee._EmployeeNo;
			employee.Code = dbEmployee._Code;
			employee.Initials = dbEmployee._Initials;
			employee.Title = dbEmployee._Title;
			employee.Surname = dbEmployee._Surname;
			employee.Forename = dbEmployee._Forename;

			employee.Notes = dbEmployee._Notes;
			employee.Status = SacsSystem.GetStatusForCode(dbEmployee._Status);
			employee.SetCreateStamp(dbEmployee._CreateOn, new SysId(dbEmployee._CreateBy), dbEmployee._CreateHost);
			employee.SetUpdateStamp(dbEmployee._UpdateOn, new SysId(dbEmployee._UpdateBy), dbEmployee._UpdateHost);
			employee.AcceptChanges();
		}

		//-------------------------------------------------------------------
		// Employee column definitions.
		private static readonly String aliasEmployee = "aAdmAct";
		private void SetEmployeeColDfn
			(ColumnDfn col, String caption, int width, SpmDbDfn.ColumnIdx dbCol,
			ColumnAlignment align = ColumnAlignment.Default, DataValue.DataType dataType = DataValue.DataType.String,
			String alias = "", String prefix = "")
		{
			if (String.IsNullOrEmpty(alias) && SpmDbDfn.GetTableForColumn(dbCol) == SpmDbDfn.TableIdx.SwmEmployee)
				alias = aliasEmployee;
			col.Set(caption, width, (int)dbCol, prefix + SpmDbDfn.GetColumnName(dbCol, false), SpmDbDfn.GetColumnNameQual(dbCol, alias), dataType, align);
			if (dataType == DataValue.DataType.String && dbCol != SpmDbDfn.ColumnIdx.Unknown)
				col.MaxLength = (int)SpmDbDfn.GetColTextLen(dbCol);
		}
		//-------------------------------------------------------------------
		// Getting prmEmployee column definition.
		public override ColumnDfn GetEmployeeColumnDfn(SpmEmployee.Column columnId, string caption = "", int width = 0)
		{
			ColumnDfn columnDfn = new ColumnDfn((int)columnId, caption, width);
			switch (columnId)
			{
				case SpmEmployee.Column.Pos:
					SetEmployeeColDfn(columnDfn, "Pos", 42, SpmDbDfn.ColumnIdx.Unknown, ColumnAlignment.Right);
					columnDfn.SortMode = ColumnDfn.ColumnSortMode.Off;
					columnDfn.ReadOnly = true;
					columnDfn.Resizable = false;
					break;
				case SpmEmployee.Column.Id:
					SetEmployeeColDfn(columnDfn, "Id", 40, SpmDbDfn.ColumnIdx.SwmEmployee_Id, ColumnAlignment.Right, DataValue.DataType.Long);
					columnDfn.ReadOnly = true;
					break;

				// Employee Properties.
				case SpmEmployee.Column.InstitutionId:
					SetEmployeeColDfn(columnDfn, "InstitutionId", 40, SpmDbDfn.ColumnIdx.SwmEmployee_InstitutionId, ColumnAlignment.Right, DataValue.DataType.Long);
					columnDfn.ReadOnly = true;
					break;
				case SpmEmployee.Column.EmployeeNo:
					SetEmployeeColDfn(columnDfn, "EmployeeNo", 60, SpmDbDfn.ColumnIdx.SwmEmployee_EmployeeNo, ColumnAlignment.Center, DataValue.DataType.String);
					break;
				case SpmEmployee.Column.Code:
					SetEmployeeColDfn(columnDfn, "Code", 60, SpmDbDfn.ColumnIdx.SwmEmployee_Code, ColumnAlignment.Center, DataValue.DataType.String);
					break;
				case SpmEmployee.Column.Initials:
					SetEmployeeColDfn(columnDfn, "Initials", 90, SpmDbDfn.ColumnIdx.SwmEmployee_Initials);
					break;
				case SpmEmployee.Column.Title:
					SetEmployeeColDfn(columnDfn, "Title", 90, SpmDbDfn.ColumnIdx.SwmEmployee_Title);
					break;
				case SpmEmployee.Column.Surname:
					SetEmployeeColDfn(columnDfn, "Surname", 90, SpmDbDfn.ColumnIdx.SwmEmployee_Surname);
					break;
				case SpmEmployee.Column.Forename:
					SetEmployeeColDfn(columnDfn, "Forename", 90, SpmDbDfn.ColumnIdx.SwmEmployee_Forename);
					break;

				// Common properties.
				case SpmEmployee.Column.Notes:
					SetEmployeeColDfn(columnDfn, "Notes", 200, SpmDbDfn.ColumnIdx.SwmEmployee_Notes);
					break;
				case SpmEmployee.Column.Status:
					SetEmployeeColDfn(columnDfn, "Status", 50, SpmDbDfn.ColumnIdx.SwmEmployee_Status, ColumnAlignment.Center);
					break;
				case SpmEmployee.Column.Status_Desc:
					SetEmployeeColDfn(columnDfn, "Status", 50, SpmDbDfn.ColumnIdx.SwmEmployee_Status, ColumnAlignment.Center);
					break;
				case SpmEmployee.Column.Status_Ind:
					SetEmployeeColDfn(columnDfn, "Status", 50, SpmDbDfn.ColumnIdx.SwmEmployee_Status, ColumnAlignment.Center, DataValue.DataType.TriState);
					columnDfn.TriStateFormat = ColumnTriStateFormat.Lights;
					break;
				case SpmEmployee.Column.CreateOn_Date:
					SetEmployeeColDfn(columnDfn, "Created", 65, SpmDbDfn.ColumnIdx.SwmEmployee_CreateOn, ColumnAlignment.Center, DataValue.DataType.Date);
					columnDfn.ReadOnly = true;
					break;
				case SpmEmployee.Column.UpdateOn_Date:
					SetEmployeeColDfn(columnDfn, "Updated", 65, SpmDbDfn.ColumnIdx.SwmEmployee_UpdateOn, ColumnAlignment.Center, DataValue.DataType.Date);
					columnDfn.ReadOnly = true;
					break;
			}
			if (!String.IsNullOrEmpty(caption))
				columnDfn.Caption = caption;
			if (width > 0)
				columnDfn.Width = width;
			return columnDfn;
		}

		//-------------------------------------------------------------------
		// Employee query filter.
		public override List<string> GetEmployeeQueryFilter(SpmEmployee.Params prm)
		{
			List<String> filters = new List<String>();

			// Employee Id.
			String includedIds = prm.IncludedIds.Concat(",");
			if (!includedIds.IsEmpty())
				filters.Add(SpmDbDfn.GetColumnNameQual(SpmDbDfn.ColumnIdx.SwmEmployee_Id, aliasEmployee) + " IN (" + includedIds + ")");
			String excludedIds = prm.ExcludedIds.Concat(",");
			if (!excludedIds.IsEmpty())
				filters.Add(SpmDbDfn.GetColumnNameQual(SpmDbDfn.ColumnIdx.SwmEmployee_Id, aliasEmployee) + " NOT IN (" + excludedIds + ")");

			// Institution Id.
			String colInstitutionId = SpmDbDfn.GetColumnNameQual(SpmDbDfn.ColumnIdx.SwmOperation_InstitutionId, aliasOperation);
			if (SysId.IsValid(prm.InstitutionId))
				filters.Add(colInstitutionId + "=" + prm.InstitutionId.ToString());

			// Employee Number.
			String employeeNo = DbQuery.FormatForCondition(prm.EmployeeNo);
			String colEmployeeNo = SpmDbDfn.GetColumnNameQual(SpmDbDfn.ColumnIdx.SwmEmployee_EmployeeNo, aliasEmployee);
			if (!StringUtil.IsEmpty(employeeNo))
				filters.Add(DbQuery.FormatFn_Left(colEmployeeNo, employeeNo.Length) + "='" + employeeNo + "'");

			// Code.
			String code = DbQuery.FormatForCondition(prm.Code);
			String sColCode = SpmDbDfn.GetColumnNameQual(SpmDbDfn.ColumnIdx.SwmEmployee_Code, aliasEmployee);
			if (!StringUtil.IsEmpty(code))
				filters.Add(DbQuery.FormatFn_Left(sColCode, code.Length) + "='" + code + "'");

			// Partial name.
			String surname = DbQuery.FormatForCondition(prm.Surname);
			String sColName = SpmDbDfn.GetColumnNameQual(SpmDbDfn.ColumnIdx.SwmEmployee_Surname, aliasEmployee);
			if (!StringUtil.IsEmpty(surname))
				filters.Add(DbQuery.FormatFn_Left(sColName, surname.Length) + "='" + surname + "'");

			if (filters.Count < 1) filters.Add("1=1");
			return filters;
		}

		//-------------------------------------------------------------------
		// Employee sort columns.
		public List<String> GetEmployeeSortColumns(SpmEmployee.Params prm)
		{
			// Sort sequence:
			List<String> sortColumnNames = new List<String>();
			foreach (var columnDfn in prm.SortColumns)
			{
				// Need to ensure correct alias used for Employee columns in case of conflict.
				String sortCol = String.Empty;
				if (SpmDbDfn.GetTableForColumn((SpmDbDfn.ColumnIdx)columnDfn.DbColumn) == SpmDbDfn.TableIdx.SwmEmployee)
				{
					sortCol = SpmDbDfn.GetColumnNameQual((SpmDbDfn.ColumnIdx)columnDfn.DbColumn, aliasEmployee);
				}
				else
				{
					sortCol = columnDfn.DataName;
					if (!StringUtil.IsEmpty(columnDfn.SortDataName))
						sortCol = columnDfn.SortDataName;
				}
				if (!sortCol.IsEmpty())
				{
					DbOrderByNullMode orderByNullMode = DbOrderByNullMode.Default; // eSaOrderByDemoteNulls, eSaOrderByPromoteNulls
					sortColumnNames.Add(DbQuery.FormatForOrderBy(sortCol, columnDfn.SortAscending, orderByNullMode).Concat(", "));
				}
			}
			sortColumnNames.RemoveBlanks();
			if (sortColumnNames.IsEmpty())
			{
				// Default sort columns:
				//sortColumnNames.Add(SpmDbDfn.GetColumnNameQual(SpmDbDfn.ColumnIdx.SwmEmployee_Type, aliasEmployee) + " ASC");
			}
			return sortColumnNames;
		}

		//-------------------------------------------------------------------
		// Employee count.
		private long GetEmployeeCount(String filter)
		{
			ClearErrorState();
			return Database.GetRowCount(SpmDbDfn.GetTableName(SpmDbDfn.TableIdx.SwmEmployee) + " As " + aliasEmployee, filter);
		}
		public override long GetEmployeeCount(SpmEmployee.Params prm)
		{
			ClearErrorState();
			return GetEmployeeCount(GetEmployeeQueryFilter(prm).Concat(" AND ", "(", ")"));
		}

		//-------------------------------------------------------------------
		// Employee list.
		public override List<SpmEmployee> GetEmployeeList(SpmEmployee.Params prm)
		{
			List<SpmEmployee> Employeees = new List<SpmEmployee>();
			DbQuery qry = new DbQuery(Database.DbmsType);
			qry.Tables.Add(SpmDbDfn.GetTableName(SpmDbDfn.TableIdx.SwmEmployee), aliasEmployee);
			qry.Columns.AddRange(SwmEmployee_Db.Fields);
			qry.Filters.AddRange(GetEmployeeQueryFilter(prm));
			// Query data.
			using (var dbConnection = Database.CreateConnection())
			using (var dbCommand = dbConnection.CreateCommand())
			{
				try
				{
					dbConnection.Open();
					dbCommand.CommandText = qry.BuildQuery();
					using (DbDataReader dbDataReader = dbCommand.ExecuteReader())
					{
						while (dbDataReader.Read())
						{
							SwmEmployee_Db dbEmployee = new SwmEmployee_Db(DbInfo);
							dbEmployee.PopulateFrom(dbDataReader);
							Employeees.Add(CreateEmployee(dbEmployee));
						}
					}
				}
				catch (Exception exc)
				{
					Logger.Warn(GetType().Name + ".GetEmployeeList\n\tQuery: " + dbCommand.CommandText + "\n\tException: " + exc.Message);
				}
			}
			return Employeees;
		}

		//-------------------------------------------------------------------
		// Employee query execution.
		public override DbResultSet ExecuteEmployeeQuery(List<ColumnDfn> columns, SpmEmployee.Params prm)
		{
			ClearErrorState();

			//---------------------------------------------------------------
			// Construct query.
			DbQuery query = new DbQuery(Database.DbmsType);
			query.Tables.Add(SpmDbDfn.GetTableName(SpmDbDfn.TableIdx.SwmEmployee), aliasEmployee);

			// Employee Properties - add columns as defined in query list.
			if (columns.HasId((int)SpmEmployee.Column.Id))
				query.Columns.Add(SpmDbDfn.GetColumnNameQual(SpmDbDfn.ColumnIdx.SwmEmployee_Id, aliasEmployee));
			if (columns.HasId((int)SpmEmployee.Column.EmployeeNo))
				query.Columns.Add(SpmDbDfn.GetColumnNameQual(SpmDbDfn.ColumnIdx.SwmEmployee_EmployeeNo, aliasEmployee));
			if (columns.HasId((int)SpmEmployee.Column.Code))
				query.Columns.Add(SpmDbDfn.GetColumnNameQual(SpmDbDfn.ColumnIdx.SwmEmployee_Code, aliasEmployee));
			if (columns.HasId((int)SpmEmployee.Column.Initials))
				query.Columns.Add(SpmDbDfn.GetColumnNameQual(SpmDbDfn.ColumnIdx.SwmEmployee_Initials, aliasEmployee));
			if (columns.HasId((int)SpmEmployee.Column.Title))
				query.Columns.Add(SpmDbDfn.GetColumnNameQual(SpmDbDfn.ColumnIdx.SwmEmployee_Title, aliasEmployee));
			if (columns.HasId((int)SpmEmployee.Column.Forename))
				query.Columns.Add(SpmDbDfn.GetColumnNameQual(SpmDbDfn.ColumnIdx.SwmEmployee_Forename, aliasEmployee));
			if (columns.HasId((int)SpmEmployee.Column.Surname))
				query.Columns.Add(SpmDbDfn.GetColumnNameQual(SpmDbDfn.ColumnIdx.SwmEmployee_Surname, aliasEmployee));

			// Common Properties
								if (columns.HasId((int)SpmEmployee.Column.Notes))
					query.Columns.Add(SpmDbDfn.GetColumnNameQual(SpmDbDfn.ColumnIdx.SwmEmployee_Notes, aliasEmployee));
			if (columns.HasId((int)SpmEmployee.Column.Status) || columns.HasId((int)SpmEmployee.Column.Status_Desc) || columns.HasId((int)SpmEmployee.Column.Status_Ind))
				query.Columns.Add(SpmDbDfn.GetColumnNameQual(SpmDbDfn.ColumnIdx.SwmEmployee_Status, aliasEmployee));
			if (columns.HasId((int)SpmEmployee.Column.CreateOn_Date))
				query.Columns.Add(SpmDbDfn.GetColumnNameQual(SpmDbDfn.ColumnIdx.SwmEmployee_CreateOn, aliasEmployee));
			if (columns.HasId((int)SpmEmployee.Column.UpdateOn_Date))
				query.Columns.Add(SpmDbDfn.GetColumnNameQual(SpmDbDfn.ColumnIdx.SwmEmployee_UpdateOn, aliasEmployee));

			//---------------------------------------------------------------
			// Populate filter.
			query.Filters.AddRange(GetEmployeeQueryFilter(prm));

			if (prm.IncludedIds.Count != 1)
			{
				// Configure sort sequence.
				foreach (String sortColumn in GetEmployeeSortColumns(prm))
					query.OrderBy.Add(sortColumn);
			}

			//---------------------------------------------------------------
			//return new DbResultSet_DataTableReader(Database, query.BuildQuery());
			return new Sarand.Win.Dbas.Data.DbResultSet_DataReader(Database, query.BuildQuery());
		}

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