using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Media.Imaging;
using Comal.Classes;
using InABox.Clients;
using InABox.Core;
using InABox.DynamicGrid;
using InABox.WPF;

namespace PRSDesktop
{
    public class TimeSheetLeaveRequestGrid : DynamicDataGrid<LeaveRequest>
    {
        public DateTime From { get; set; }
        public DateTime To { get; set; }
        
        public TimeSheetLeaveRequestGrid() : base()
        {
            ColumnsTag = "TimeSheetLeaveRequest";
            
            Options
                .BeginUpdate()
                .Clear()
                .Add(DynamicGridOption.SelectColumns)
                .EndUpdate();
            ActionColumns.Add(new DynamicImageColumn(SelectedImage, SelectedAction));
            HiddenColumns.Add(x => x.EmployeeLink.ID);
            HiddenColumns.Add(x => x.LeaveType.ID);
            HiddenColumns.Add(x => x.From);
            HiddenColumns.Add(x => x.FromTime);
            HiddenColumns.Add(x => x.To);
            HiddenColumns.Add(x => x.ToTime);
            HiddenColumns.Add(x => x.Notes);
        }

        protected override void GenerateColumns(DynamicGridColumns columns)
        {
            columns.Add<LeaveRequest, String>(x => x.EmployeeLink.Name, 0, "Employee", "", Alignment.MiddleLeft);
            columns.Add<LeaveRequest, String>(x => x.LeaveType.Description, 200, "Type", "", Alignment.MiddleCenter);
            columns.Add<LeaveRequest, DateTime>(x => x.From, 80, "", "dd MMM yy", Alignment.MiddleCenter);
            columns.Add<LeaveRequest, DateTime>(x => x.To, 80, "", "dd MMM yy", Alignment.MiddleCenter);
        }

        private BitmapImage tick = PRSDesktop.Resources.tick.AsBitmapImage();
        private List<Guid> selectedrows = new List<Guid>();

        private bool SelectedAction(CoreRow? arg)
        {
            if (arg == null)
            {
                foreach (var row in Data.Rows)
                    ToggleRow(row);
            }
            else
                ToggleRow(arg);
            return false;
        }

        private void ToggleRow(CoreRow row)
        {
            Guid id = row.Get<LeaveRequest, Guid>(x => x.ID);
            if (selectedrows.Contains(id))
                selectedrows.Remove(id);
            else
                selectedrows.Add(id);
            InvalidateRow(row);
        }

        private BitmapImage? SelectedImage(CoreRow? arg)
        {
            return arg == null
                ? tick
                : selectedrows.Contains(arg.Get<LeaveRequest,Guid>(x=>x.ID))
                    ? tick
                    : null;
        }

        protected override void Reload(Filters<LeaveRequest> criteria, Columns<LeaveRequest> columns, ref SortOrder<LeaveRequest>? sort, Action<CoreTable?, Exception?> action)
        {
            criteria.Add(new InABox.Core.Filter<LeaveRequest>(x => x.From).IsLessThanOrEqualTo(To)
                .And(x => x.To).IsGreaterThanOrEqualTo(From)
                .And(x=>x.Status).IsEqualTo(LeaveRequestStatus.Approved)
                .And(x =>x.Processed).IsEqualTo(DateTime.MinValue));
            base.Reload(criteria, columns, ref sort, action);
        }

        public void Process(IProgress<String> progress)
        {
            if (!selectedrows.Any())
                return;

            var employeeids = Data.ToDictionary<LeaveRequest, Guid, Guid>(x => x.ID, x => x.EmployeeLink.ID)
                .Where(x=>selectedrows.Contains(x.Key))
                .Select(x=>x.Value)
                .Distinct()
                .ToArray();

            progress.Report("Loading Leave Requests");
            var employees = new Client<Employee>().Query(
                new Filter<Employee>(x=>x.ID).InList(employeeids),
                new Columns<Employee>(x => x.ID)
                    .Add(x=>x.Name)
                    .Add(x=>x.Roster)
                    .Add(x=>x.RosterStart)
                    .Add(x => x.StartDate)
                    .Add(x => x.FinishDate)
            ).Rows.Select(x=>x.ToObject<Employee>()).ToArray();

            var rosters = employees.ToDictionary<Employee, Guid, String>(x => x.ID, x => x.Roster);

            int i = 0;
            List<LeaveRequest> leaves = new List<LeaveRequest>();
            foreach (var row in Data.Rows)
            {
                if (selectedrows.Contains(row.Get<LeaveRequest, Guid>(x => x.ID)))
                {
                    var leave = row.ToObject<LeaveRequest>();
                    var employee = employees.FirstOrDefault(x => x.ID == leave.EmployeeLink.ID);
                    if (employee != null)
                    {
                        var roster = !String.IsNullOrWhiteSpace(rosters[employee.ID])
                            ? Serialization.Deserialize<List<EmployeeRosterItem>>(rosters[employee.ID])?.OrderBy(x => x.Day).ToArray()
                            : null;
                        progress.Report($"Processing Leave Request {((double)i * 100.0F / (double)selectedrows.Count):F2}");
                        var timesheets = RosterUtils.CreateLeaveTimesheets(
                            employee,
                            roster,
                            leave.From,
                            leave.FromTime,
                            leave.To,
                            leave.ToTime,
                            leave.LeaveType.ID,
                            (timesheet) =>
                            {
                                timesheet.Notes = leave.Notes;
                                timesheet.LeaveRequestLink.ID = leave.ID;
                            }
                        );
                        new Client<TimeSheet>().Save(timesheets, "Updated from TimeSheet leave Processor");
                    }

                    i++;
                    leave.Processed = DateTime.Now;
                    leaves.Add(leave);
                }
            }

            if (leaves.Any())
            {
                progress.Report("Saving Leave Requests");
                new Client<LeaveRequest>().Save(leaves, "Updated from TimeSheet leave Processor");
            }
        }
        
    }
}