@page "/playouts/add"
@page "/playouts/add/{kind}"
@using System.Globalization
@using ErsatzTV.Application.Channels
@using ErsatzTV.Application.ProgramSchedules
@using ErsatzTV.Validators
@using FluentValidation.Results
@implements IDisposable
@inject NavigationManager NavigationManager
@inject ILogger<PlayoutEditor> Logger
@inject ISnackbar Snackbar
@inject IMediator Mediator

<MudForm @ref="_form" Validation="@(_validator.ValidateValue)" ValidationDelay="0" Style="max-height: 100%">
    <MudPaper Square="true" Style="display: flex; height: 64px; min-height: 64px; width: 100%; z-index: 100; align-items: center">
        <MudButton Class="ml-6" OnClick="@HandleSubmitAsync" Variant="Variant.Filled" Color="Color.Primary" StartIcon="@Icons.Material.Filled.Add">
            Add Playout
        </MudButton>
    </MudPaper>
    <div class="d-flex flex-column" style="height: 100vh; overflow-x: auto">
        <MudContainer MaxWidth="MaxWidth.ExtraLarge" Class="pt-8">
            <MudText Typo="Typo.h5" Class="mb-2">Playout</MudText>
            <MudDivider Class="mb-6"/>
            <MudStack Row="true" Breakpoint="Breakpoint.SmAndDown" Class="form-field-stack gap-md-8 mb-5">
                <div class="d-flex">
                    <MudText>Channel</MudText>
                </div>
                <MudSelect T="ChannelViewModel" @bind-value="_model.Channel" HelperText="Disabled channels already have a playout">
                    @foreach (ChannelViewModel channel in _channels)
                    {
                        <MudSelectItem Disabled="@(channel.PlayoutCount > 0)" Value="@channel">
                            @($"{channel.Number} - {channel.Name}")
                        </MudSelectItem>
                    }
                </MudSelect>
            </MudStack>
            @switch (Kind)
            {
                case PlayoutKind.ExternalJson:
                    <MudStack Row="true" Breakpoint="Breakpoint.SmAndDown" Class="form-field-stack gap-md-8 mb-5">
                        <div class="d-flex">
                            <MudText>JSON (dizqueTV) Schedule</MudText>
                        </div>
                        <MudTextField @bind-Value="_model.ScheduleFile" For="@(() => _model.ScheduleFile)"/>
                    </MudStack>
                    break;
                case PlayoutKind.Sequential:
                    <MudStack Row="true" Breakpoint="Breakpoint.SmAndDown" Class="form-field-stack gap-md-8 mb-5">
                        <div class="d-flex">
                            <MudText>Sequential Schedule</MudText>
                        </div>
                        <MudTextField @bind-Value="_model.ScheduleFile" For="@(() => _model.ScheduleFile)" HelperText="The full path to the sequential schedule (YAML) file" />
                    </MudStack>
                    break;
                case PlayoutKind.Scripted:
                    <MudStack Row="true" Breakpoint="Breakpoint.SmAndDown" Class="form-field-stack gap-md-8 mb-5">
                        <div class="d-flex">
                            <MudText>Scripted Schedule</MudText>
                        </div>
                        <MudTextField @bind-Value="_model.ScheduleFile" For="@(() => _model.ScheduleFile)"/>
                    </MudStack>
                    break;
                case PlayoutKind.Block:
                    <MudStack Row="true" Breakpoint="Breakpoint.SmAndDown" Class="form-field-stack gap-md-8 mb-5">
                        <div class="d-flex"></div>
                        <MudText Typo="Typo.caption" Style="font-weight: normal">Block templates are added later</MudText>
                    </MudStack>
                    break;
                default:
                    <MudStack Row="true" Breakpoint="Breakpoint.SmAndDown" Class="form-field-stack gap-md-8 mb-5">
                        <div class="d-flex">
                            <MudText>Classic Schedule</MudText>
                        </div>
                        <MudSelect T="ProgramScheduleViewModel" @bind-value="_model.ProgramSchedule">
                            @foreach (ProgramScheduleViewModel schedule in _programSchedules)
                            {
                                <MudSelectItem Value="@schedule">@schedule.Name</MudSelectItem>
                            }
                        </MudSelect>
                    </MudStack>
                    break;
            }
        </MudContainer>
    </div>
</MudForm>

@code {
    private CancellationTokenSource _cts;

    private readonly PlayoutEditViewModel _model = new();
    private readonly PlayoutEditViewModelValidator _validator = new();
    private MudForm _form;

    private List<ChannelViewModel> _channels = [];
    private List<ProgramScheduleViewModel> _programSchedules = [];

    [Parameter]
    public string Kind { get; set; }

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

    protected override async Task OnParametersSetAsync()
    {
        _cts?.Cancel();
        _cts?.Dispose();
        _cts = new CancellationTokenSource();
        var token = _cts.Token;

        try
        {
            _model.Kind = Kind;

            _channels = await Mediator.Send(new GetAllChannels(), token)
                .Map(list => list.OrderBy(vm => decimal.Parse(vm.Number, CultureInfo.InvariantCulture)).ToList());

            if (string.IsNullOrWhiteSpace(Kind))
            {
                _programSchedules = await Mediator.Send(new GetAllProgramSchedules(), token)
                    .Map(list => list.OrderBy(vm => vm.Name).ToList());
            }
        }
        catch (OperationCanceledException)
        {
            // do nothing
        }
    }

    private async Task HandleSubmitAsync()
    {
        await _form.Validate();
        ValidationResult result = await _validator.ValidateAsync(_model, _cts.Token);
        if (result.IsValid)
        {
            Seq<BaseError> errorMessage = (await Mediator.Send(_model.ToCreate(), _cts.Token)).LeftToSeq();

            errorMessage.HeadOrNone().Match(
                error =>
                {
                    Snackbar.Add(error.Value, Severity.Error);
                    Logger.LogError("Unexpected error saving playout: {Error}", error.Value);
                },
                () => NavigationManager.NavigateTo("playouts"));
        }
    }

}