@page "/playouts/{Id:int}/alternate-schedules"
@using ErsatzTV.Application.ProgramSchedules
@using ErsatzTV.Application.Playouts
@using Microsoft.AspNetCore.Components
@using ErsatzTV.Application.Channels
@using System.Text
@using System.Globalization
@implements IDisposable
@inject NavigationManager NavigationManager
@inject ILogger<ScheduleItemsEditor> Logger
@inject ISnackbar Snackbar
@inject IMediator Mediator

<MudContainer MaxWidth="MaxWidth.ExtraLarge" Class="pt-8">
<MudTable Hover="true" Items="_items.OrderBy(i => i.Index)" Dense="true" @bind-SelectedItem="_selectedItem">
    <ToolBarContent>
        <MudText Typo="Typo.h6">@_channelName Alternate Schedules</MudText>
        <MudSpacer />
        <MudText Typo="Typo.subtitle1" Class="mr-3">In priority order from top to bottom</MudText>
    </ToolBarContent>
    <ColGroup>
        <col/>
        <col/>
        <col/>
        <col/>
        <col style="width: 60px;"/>
        <col style="width: 60px;"/>
        <col style="width: 60px;"/>
    </ColGroup>
    <HeaderContent>
        <MudTh>Schedule</MudTh>
        <MudTh>Days of the Week</MudTh>
        <MudTh>Days of the Month</MudTh>
        <MudTh>Months</MudTh>
        <MudTh/>
        <MudTh/>
        <MudTh/>
    </HeaderContent>
    <RowTemplate>
        <MudTd DataLabel="Schedule">
            <MudText Typo="@(context == _selectedItem ? Typo.subtitle2 : Typo.body2)">
                @context.ProgramSchedule.Name
            </MudText>
        </MudTd>
        <MudTd DataLabel="Days of the Week">
            <MudText Typo="@(context == _selectedItem ? Typo.subtitle2 : Typo.body2)">
                @ToDaysOfWeekString(context.DaysOfWeek)
            </MudText>
        </MudTd>
        <MudTd DataLabel="Days of the Month">
            <MudText Typo="@(context == _selectedItem ? Typo.subtitle2 : Typo.body2)">
                @ToDaysOfMonthString(context.DaysOfMonth)
            </MudText>
        </MudTd>
        <MudTd DataLabel="Months">
            <MudText Typo="@(context == _selectedItem ? Typo.subtitle2 : Typo.body2)">
                @ToMonthsOfYearString(context.MonthsOfYear)
            </MudText>
        </MudTd>
        <MudTd>
            <MudIconButton Icon="@Icons.Material.Filled.ArrowUpward"
                           OnClick="@(_ => MoveItemUp(context))"
                           Disabled="@(_items.All(x => x.Index >= context.Index))">
            </MudIconButton>
        </MudTd>
        <MudTd>
            <MudIconButton Icon="@Icons.Material.Filled.ArrowDownward"
                           OnClick="@(_ => MoveItemDown(context))"
                           Disabled="@(_items.All(x => x.Index <= context.Index))">
            </MudIconButton>
        </MudTd>
        <MudTd>
            <MudIconButton Icon="@Icons.Material.Filled.Delete"
                           OnClick="@(_ => RemoveAlternateSchedule(context))"
                           Disabled="@(_items.Count == 1)">
            </MudIconButton>
        </MudTd>
    </RowTemplate>
</MudTable>
<MudButton Variant="Variant.Filled" Color="Color.Default" OnClick="@(_ => AddAlternateSchedule())" Class="mt-4">
    Add Alternate Schedule
</MudButton>
<MudButton Variant="Variant.Filled" Color="Color.Primary" OnClick="@(_ => SaveChanges())" Class="mt-4 ml-4">
    Save Changes
</MudButton>

@if (_selectedItem is not null)
{
    <EditForm Model="_selectedItem">
    <FluentValidator/>
    <div style="display: flex; flex-direction: row;" class="mt-6">
        <div style="flex-grow: 1; max-width: 400px;" class="mr-6">
            <MudCard>
                <MudCardContent>
                    <MudSelect Label="Schedule" @bind-Value="_selectedItem.ProgramSchedule" For="@(() => _selectedItem.ProgramSchedule)">
                        @foreach (ProgramScheduleViewModel schedule in _schedules)
                        {
                            <MudSelectItem Value="@schedule">@schedule.Name</MudSelectItem>
                        }
                    </MudSelect>
                </MudCardContent>
            </MudCard>
            <MudCard Class="mt-4">
                <MudCardContent>
                    <MudElement HtmlTag="div" Class="mt-3">
                        <MudCheckBox T="bool" Label="@_dtf.GetDayName(DayOfWeek.Monday)"
                                     Checked="@(_selectedItem.DaysOfWeek.Contains(DayOfWeek.Monday))"
                                     CheckedChanged="@(c => DayOfWeekChanged(DayOfWeek.Monday, c))"/>
                    </MudElement>
                    <MudElement HtmlTag="div" Class="mt-2">
                        <MudCheckBox T="bool" Label="@_dtf.GetDayName(DayOfWeek.Tuesday)"
                                     Checked="@(_selectedItem.DaysOfWeek.Contains(DayOfWeek.Tuesday))"
                                     CheckedChanged="@(c => DayOfWeekChanged(DayOfWeek.Tuesday, c))"/>
                    </MudElement>
                    <MudElement HtmlTag="div" Class="mt-2">
                        <MudCheckBox T="bool" Label="@_dtf.GetDayName(DayOfWeek.Wednesday)"
                                     Checked="@(_selectedItem.DaysOfWeek.Contains(DayOfWeek.Wednesday))"
                                     CheckedChanged="@(c => DayOfWeekChanged(DayOfWeek.Wednesday, c))"/>
                    </MudElement>
                    <MudElement HtmlTag="div" Class="mt-2">
                        <MudCheckBox T="bool" Label="@_dtf.GetDayName(DayOfWeek.Thursday)"
                                     Checked="@(_selectedItem.DaysOfWeek.Contains(DayOfWeek.Thursday))"
                                     CheckedChanged="@(c => DayOfWeekChanged(DayOfWeek.Thursday, c))"/>
                    </MudElement>
                    <MudElement HtmlTag="div" Class="mt-2">
                        <MudCheckBox T="bool" Label="@_dtf.GetDayName(DayOfWeek.Friday)"
                                     Checked="@(_selectedItem.DaysOfWeek.Contains(DayOfWeek.Friday))"
                                     CheckedChanged="@(c => DayOfWeekChanged(DayOfWeek.Friday, c))"/>
                    </MudElement>
                    <MudElement HtmlTag="div" Class="mt-2">
                        <MudCheckBox T="bool" Label="@_dtf.GetDayName(DayOfWeek.Saturday)"
                                     Checked="@(_selectedItem.DaysOfWeek.Contains(DayOfWeek.Saturday))"
                                     CheckedChanged="@(c => DayOfWeekChanged(DayOfWeek.Saturday, c))"/>
                    </MudElement>
                    <MudElement HtmlTag="div" Class="mt-2">
                        <MudCheckBox T="bool" Label="@_dtf.GetDayName(DayOfWeek.Sunday)"
                                     Checked="@(_selectedItem.DaysOfWeek.Contains(DayOfWeek.Sunday))"
                                     CheckedChanged="@(c => DayOfWeekChanged(DayOfWeek.Sunday, c))"/>
                    </MudElement>
                </MudCardContent>
                <MudCardActions>
                    <MudButton Variant="Variant.Text" Color="Color.Primary" OnClick="@(_ => SelectWeekdays())">
                        Weekdays
                    </MudButton>
                    <MudButton Variant="Variant.Text" Color="Color.Primary" OnClick="@(_ => SelectWeekends())">
                        Weekends
                    </MudButton>
                    <MudButton Variant="Variant.Text" Color="Color.Primary" OnClick="@(_ => SelectAllDaysOfWeek())">
                        All
                    </MudButton>
                    <MudButton Variant="Variant.Text" Color="Color.Primary" OnClick="@(_ => SelectNoDaysOfWeek())">
                        None
                    </MudButton>
                </MudCardActions>
            </MudCard>
        </div>
        <div style="flex-grow: 1; max-width: 400px;" class="mr-6">
            <MudCard>
                <MudCardContent>
                    <MudGrid Justify="Justify.FlexStart" Class="mt-3">
                        @foreach (int day in Enumerable.Range(1, 31))
                        {
                            <MudItem xs="3">
                                <MudCheckBox T="bool" Label="@day.ToString()"
                                             Checked="@(_selectedItem.DaysOfMonth.Contains(day))"
                                             CheckedChanged="@(c => DayOfMonthChanged(day, c))"/>
                            </MudItem>
                        }
                    </MudGrid>
                </MudCardContent>
                <MudCardActions>
                    <MudButton Variant="Variant.Text" Color="Color.Primary" OnClick="@(_ => SelectAllDaysOfMonth())">
                        All
                    </MudButton>
                    <MudButton Variant="Variant.Text" Color="Color.Primary" OnClick="@(_ => SelectNoDaysOfMonth())">
                        None
                    </MudButton>
                </MudCardActions>
            </MudCard>
        </div>
        <div style="flex-grow: 1; max-width: 400px;">
            <MudCard>
                <MudCardContent>
                    <MudElement HtmlTag="div" Class="mt-3">
                        <MudCheckBox T="bool" Label="@_dtf.GetMonthName(1)"
                                     Checked="@(_selectedItem.MonthsOfYear.Contains(1))"
                                     CheckedChanged="@(c => MonthOfYearChanged(1, c))"/>
                    </MudElement>
                    @foreach (int month in Enumerable.Range(2, 11))
                    {
                        <MudElement HtmlTag="div" Class="mt-2">
                            <MudCheckBox T="bool" Label="@_dtf.GetMonthName(month)"
                                         Checked="@(_selectedItem.MonthsOfYear.Contains(month))"
                                         CheckedChanged="@(c => MonthOfYearChanged(month, c))"/>
                        </MudElement>
                    }
                </MudCardContent>
                <MudCardActions>
                    <MudButton Variant="Variant.Text" Color="Color.Primary" OnClick="@(_ => SelectAllMonthsOfYear())">
                        All
                    </MudButton>
                    <MudButton Variant="Variant.Text" Color="Color.Primary" OnClick="@(_ => SelectNoMonthsOfYear())">
                        None
                    </MudButton>
                </MudCardActions>
            </MudCard>
        </div>
    </div>
    </EditForm>
}
</MudContainer>

@code {
    private readonly CancellationTokenSource _cts = new();

    private readonly DateTimeFormatInfo _dtf = CultureInfo.CurrentUICulture.DateTimeFormat;

    [Parameter]
    public int Id { get; set; }

    private string _channelName;
    private List<PlayoutAlternateScheduleEditViewModel> _items;
    private List<ProgramScheduleViewModel> _schedules;

    private PlayoutAlternateScheduleEditViewModel _selectedItem;

    public void Dispose()
    {
        _cts.Cancel();
        _cts.Dispose();
    }

    protected override async Task OnParametersSetAsync() => await LoadScheduleItems();

    private async Task LoadScheduleItems()
    {
        _schedules = await Mediator.Send(new GetAllProgramSchedules(), _cts.Token)
            .Map(list => list.OrderBy(vm => vm.Name, StringComparer.CurrentCultureIgnoreCase).ToList());

        _channelName = (await Mediator.Send(new GetChannelNameByPlayoutId(Id), _cts.Token)).IfNone(string.Empty);

        List<PlayoutAlternateScheduleViewModel> results = await Mediator.Send(new GetPlayoutAlternateSchedules(Id), _cts.Token);
        _items = results.Map(ProjectToEditViewModel).ToList();
        if (_items.Count == 1)
        {
            _selectedItem = _items.Head();
        }
    }

    private PlayoutAlternateScheduleEditViewModel ProjectToEditViewModel(PlayoutAlternateScheduleViewModel item) =>
        new()
        {
            Id = item.Id,
            Index = item.Index,
            ProgramSchedule = _schedules.Find(vm => vm.Id == item.ProgramScheduleId),
            DaysOfWeek = item.DaysOfWeek.OrderBy(x => ((int)x + 6) % 7).ToList(),
            DaysOfMonth = item.DaysOfMonth.ToList(),
            MonthsOfYear = item.MonthsOfYear.ToList()
        };

    private void DayOfWeekChanged(DayOfWeek dayOfWeek, bool isChecked)
    {
        if (isChecked && !_selectedItem.DaysOfWeek.Contains(dayOfWeek))
        {
            _selectedItem.DaysOfWeek.Add(dayOfWeek);
            _selectedItem.DaysOfWeek = _selectedItem.DaysOfWeek.OrderBy(x => ((int)x + 6) % 7).ToList();
        }

        if (!isChecked)
        {
            _selectedItem.DaysOfWeek.Remove(dayOfWeek);
        }
    }

    private void SelectWeekdays()
    {
        _selectedItem.DaysOfWeek.Clear();
        _selectedItem.DaysOfWeek.AddRange(new[]
        {
            DayOfWeek.Monday,
            DayOfWeek.Tuesday,
            DayOfWeek.Wednesday,
            DayOfWeek.Thursday,
            DayOfWeek.Friday
        });
    }

    private void SelectWeekends()
    {
        _selectedItem.DaysOfWeek.Clear();
        _selectedItem.DaysOfWeek.AddRange(new[]
        {
            DayOfWeek.Saturday,
            DayOfWeek.Sunday
        });
    }

    private void SelectAllDaysOfWeek()
    {
        _selectedItem.DaysOfWeek.Clear();
        _selectedItem.DaysOfWeek.AddRange(ProgramScheduleAlternate.AllDaysOfWeek());
    }

    private void SelectNoDaysOfWeek()
    {
        _selectedItem.DaysOfWeek.Clear();
    }
    
    private void DayOfMonthChanged(int dayOfMonth, bool isChecked)
    {
        if (isChecked && !_selectedItem.DaysOfMonth.Contains(dayOfMonth))
        {
            _selectedItem.DaysOfMonth.Add(dayOfMonth);
            _selectedItem.DaysOfMonth.Sort();
        }

        if (!isChecked)
        {
            _selectedItem.DaysOfMonth.Remove(dayOfMonth);
        }
    }
    
    private void SelectAllDaysOfMonth()
    {
        _selectedItem.DaysOfMonth.Clear();
        _selectedItem.DaysOfMonth.AddRange(ProgramScheduleAlternate.AllDaysOfMonth());
    }

    private void SelectNoDaysOfMonth()
    {
        _selectedItem.DaysOfMonth.Clear();
    }
    
    private void MonthOfYearChanged(int monthOfYear, bool isChecked)
    {
        if (isChecked && !_selectedItem.MonthsOfYear.Contains(monthOfYear))
        {
            _selectedItem.MonthsOfYear.Add(monthOfYear);
            _selectedItem.MonthsOfYear.Sort();
        }

        if (!isChecked)
        {
            _selectedItem.MonthsOfYear.Remove(monthOfYear);
        }
    }

    private void SelectAllMonthsOfYear()
    {
        _selectedItem.MonthsOfYear.Clear();
        _selectedItem.MonthsOfYear.AddRange(ProgramScheduleAlternate.AllMonthsOfYear());
    }

    private void SelectNoMonthsOfYear()
    {
        _selectedItem.MonthsOfYear.Clear();
    }

    private void AddAlternateSchedule()
    {
        var item = new PlayoutAlternateScheduleEditViewModel
        {
            Index = _items.Map(i => i.Index).DefaultIfEmpty().Max() + 1,
            ProgramSchedule = _schedules.Head(),
            DaysOfWeek = ProgramScheduleAlternate.AllDaysOfWeek(),
            DaysOfMonth = ProgramScheduleAlternate.AllDaysOfMonth(),
            MonthsOfYear = ProgramScheduleAlternate.AllMonthsOfYear()
        };

        _items.Add(item);
        _selectedItem = item;
    }

    private void RemoveAlternateSchedule(PlayoutAlternateScheduleEditViewModel item)
    {
        _selectedItem = null;
        _items.Remove(item);
    }

    private void MoveItemUp(PlayoutAlternateScheduleEditViewModel item)
    {
        // swap with lower index
        PlayoutAlternateScheduleEditViewModel toSwap = _items.OrderByDescending(x => x.Index).First(x => x.Index < item.Index);
        (toSwap.Index, item.Index) = (item.Index, toSwap.Index);
    }

    private void MoveItemDown(PlayoutAlternateScheduleEditViewModel item)
    {
        // swap with higher index
        PlayoutAlternateScheduleEditViewModel toSwap = _items.OrderBy(x => x.Index).First(x => x.Index > item.Index);
        (toSwap.Index, item.Index) = (item.Index, toSwap.Index);
    }

    private async Task SaveChanges()
    {
        var items = _items.Map(item => new ReplacePlayoutAlternateSchedule(
            item.Id,
            item.Index,
            item.ProgramSchedule.Id,
            item.DaysOfWeek,
            item.DaysOfMonth,
            item.MonthsOfYear)).ToList();

        Seq<BaseError> errorMessages = await Mediator.Send(new ReplacePlayoutAlternateScheduleItems(Id, items), _cts.Token)
            .Map(e => e.LeftToSeq());

        errorMessages.HeadOrNone().Match(
            error =>
            {
                Snackbar.Add($"Unexpected error saving alternate schedules: {error.Value}", Severity.Error);
                Logger.LogError("Unexpected error saving alternate schedules: {Error}", error.Value);
            },
            () => NavigationManager.NavigateTo("/playouts"));
    }

    private string ToDaysOfWeekString(List<DayOfWeek> daysOfWeek)
    {
        if (daysOfWeek.Count is 0 or 7)
        {
            return "*any*";
        }

        daysOfWeek.Sort();

        return string.Join(", ", daysOfWeek.Map(_dtf.GetAbbreviatedDayName));
    }
    
    private string ToDaysOfMonthString(List<int> daysOfMonth)
    {
        if (daysOfMonth.Count is 0 or 31)
        {
            return "*any*";
        }

        return ToRangeString(daysOfMonth);
    }
    
    private string ToMonthsOfYearString(List<int> monthsOfYear)
    {
        if (monthsOfYear.Count is 0 or 12)
        {
            return "*any*";
        }

        monthsOfYear.Sort();

        return string.Join(", ", monthsOfYear.Map(_dtf.GetAbbreviatedMonthName));
    }

    private static string ToRangeString(List<int> list)
    {
        list = list.Distinct().ToList();
        list.Sort();

        var result = new StringBuilder();
        for (var i = 0; i < list.Count; i++)
        {
            int temp = list[i];

            //add a number
            result.Append(list[i]);

            //skip number(s) between a range
            while (i < list.Count - 1 && list[i + 1] == list[i] + 1)
            {
                i++;
            }

            //add the range
            if (temp != list[i])
            {
                result.Append("-").Append(list[i]);
            }

            //add comma
            if (i != list.Count - 1)
            {
                result.Append(", ");
            }

        }

        return result.ToString();
    }

}