using LiteCqrs;
using TeleWave.Api.Common;
using TeleWave.Application.Broadcast;
using TeleWave.Application.Broadcast.CreateChannel;
using TeleWave.Application.Broadcast.GetChannel;
using TeleWave.Application.Broadcast.GetSchedule;
using TeleWave.Application.Broadcast.ListChannels;
using TeleWave.Application.Broadcast.RegenerateSchedule;
using TeleWave.Application.Broadcast.UpdateChannelSettings;
using TeleWave.Domain.Broadcast;
using TeleWave.Infrastructure.Identity;

namespace TeleWave.Api.Endpoints;

/// <summary>
/// Админ-эндпоинты канала. Реализация разнесена по partial-файлам под-ресурсов:
/// <c>ChannelEndpoints.Shows.cs</c> (шоу+реклама), <c>ChannelEndpoints.Bumpers.cs</c>
/// (блоки/подблоки/файлы/preview), <c>ChannelEndpoints.Overrides.cs</c> (override'ы). Здесь —
/// регистрация всех маршрутов и хендлеры уровня канала (создание/список/настройки/расписание).
/// </summary>
public static partial class ChannelEndpoints
{
    public static IEndpointRouteBuilder MapChannelEndpoints(this IEndpointRouteBuilder app)
    {
        var admin = app.MapGroup("/api/admin/channels")
            .WithTags("Admin.Channels")
            .RequireAuthorization(policy => policy.RequireRole(RoleNames.Admin));

        admin.MapPost("", CreateChannel).Produces<CreatedIdResponse>(StatusCodes.Status201Created);
        admin.MapGet("", ListChannels).Produces<IReadOnlyList<ChannelSummaryDto>>();
        admin.MapGet("/{id:guid}", GetChannel).Produces<ChannelDto>();
        admin
            .MapPut("/{id:guid}/settings", UpdateSettings)
            .Produces(StatusCodes.Status204NoContent);

        admin
            .MapPost("/{id:guid}/shows", AddShow)
            .Produces<CreatedIdResponse>(StatusCodes.Status201Created);
        admin
            .MapPut("/{id:guid}/shows/{channelShowId:guid}", UpdateShow)
            .Produces(StatusCodes.Status204NoContent);
        admin
            .MapDelete("/{id:guid}/shows/{channelShowId:guid}", RemoveShow)
            .Produces(StatusCodes.Status204NoContent);

        admin
            .MapPost("/{id:guid}/ads", AddAd)
            .Produces<CreatedIdResponse>(StatusCodes.Status201Created);
        admin
            .MapDelete("/{id:guid}/ads/{channelAdId:guid}", RemoveAd)
            .Produces(StatusCodes.Status204NoContent);

        admin
            .MapPost("/{id:guid}/bumper/templates", AddBumperTemplate)
            .Produces<CreatedIdResponse>(StatusCodes.Status201Created);
        admin
            .MapPut("/{id:guid}/bumper/templates/{templateId:guid}", UpdateBumperTemplate)
            .Produces(StatusCodes.Status204NoContent);
        admin
            .MapDelete("/{id:guid}/bumper/templates/{templateId:guid}", RemoveBumperTemplate)
            .Produces(StatusCodes.Status204NoContent);
        admin
            .MapPut("/{id:guid}/bumper/templates/{templateId:guid}/audio", UploadTemplateAudio)
            .Produces(StatusCodes.Status204NoContent);
        admin
            .MapDelete("/{id:guid}/bumper/templates/{templateId:guid}/audio", ClearTemplateAudio)
            .Produces(StatusCodes.Status204NoContent);
        admin
            .MapPut(
                "/{id:guid}/bumper/templates/{templateId:guid}/background",
                SetTemplateBackground
            )
            .Produces(StatusCodes.Status204NoContent);
        admin
            .MapDelete(
                "/{id:guid}/bumper/templates/{templateId:guid}/background",
                ClearTemplateBackground
            )
            .Produces(StatusCodes.Status204NoContent);

        admin
            .MapPost("/{id:guid}/bumper/templates/{templateId:guid}/preview", RenderPreview)
            .Produces(StatusCodes.Status204NoContent);
        admin.MapGet(
            "/{id:guid}/bumper/templates/{templateId:guid}/preview/{variantId:guid}/index.m3u8",
            PreviewPlaylist
        );
        admin.MapGet(
            "/{id:guid}/bumper/templates/{templateId:guid}/preview/{variantId:guid}/{file}",
            PreviewSegment
        );

        admin
            .MapPost("/{id:guid}/bumper/templates/{templateId:guid}/variants", AddBumperVariant)
            .Produces<CreatedIdResponse>(StatusCodes.Status201Created);
        admin
            .MapPut(
                "/{id:guid}/bumper/templates/{templateId:guid}/variants/{variantId:guid}",
                UpdateBumperVariant
            )
            .Produces(StatusCodes.Status204NoContent);
        admin
            .MapDelete(
                "/{id:guid}/bumper/templates/{templateId:guid}/variants/{variantId:guid}",
                RemoveBumperVariant
            )
            .Produces(StatusCodes.Status204NoContent);

        admin
            .MapPost("/{id:guid}/overrides", CreateOverride)
            .Produces<CreatedIdResponse>(StatusCodes.Status201Created);
        admin
            .MapDelete("/{id:guid}/overrides/{overrideId:guid}", DeleteOverride)
            .Produces(StatusCodes.Status204NoContent);

        admin.MapPost("/{id:guid}/regenerate", Regenerate).Produces(StatusCodes.Status204NoContent);
        admin
            .MapGet("/{id:guid}/schedule", GetSchedule)
            .Produces<IReadOnlyList<ScheduleEntryDto>>();

        return app;
    }

    private static async Task<IResult> CreateChannel(
        CreateChannelCommand command,
        ISender sender,
        CancellationToken cancellationToken
    )
    {
        var result = await sender.Send(command, cancellationToken);
        return result.IsSuccess
            ? Results.Created(
                $"/api/admin/channels/{result.Value}",
                new CreatedIdResponse(result.Value)
            )
            : result.ToHttpResult();
    }

    private static async Task<IResult> ListChannels(
        ISender sender,
        CancellationToken cancellationToken
    )
    {
        var result = await sender.Send(new ListChannelsQuery(), cancellationToken);
        return Results.Ok(result);
    }

    private static async Task<IResult> GetChannel(
        Guid id,
        ISender sender,
        CancellationToken cancellationToken
    )
    {
        var result = await sender.Send(new GetChannelQuery(id), cancellationToken);
        return result.ToHttpResult();
    }

    private static async Task<IResult> UpdateSettings(
        Guid id,
        UpdateChannelSettingsBody body,
        ISender sender,
        CancellationToken cancellationToken
    )
    {
        var result = await sender.Send(
            new UpdateChannelSettingsCommand(
                id,
                body.Name,
                body.IsEnabled,
                body.AdInsertion,
                body.AdsPerBreak,
                body.BumpersEnabled,
                body.Bumper,
                body.FillerAssetId
            ),
            cancellationToken
        );
        return result.ToHttpResult();
    }

    private static async Task<IResult> Regenerate(
        Guid id,
        ISender sender,
        CancellationToken cancellationToken
    )
    {
        var result = await sender.Send(new RegenerateChannelScheduleCommand(id), cancellationToken);
        return result.ToHttpResult();
    }

    private static async Task<IResult> GetSchedule(
        Guid id,
        DateTimeOffset? from,
        DateTimeOffset? to,
        ISender sender,
        CancellationToken cancellationToken
    )
    {
        var fromUtc = from ?? DateTimeOffset.UtcNow;
        var toUtc = to ?? fromUtc.AddDays(1);
        var result = await sender.Send(
            new GetChannelScheduleQuery(id, fromUtc, toUtc),
            cancellationToken
        );
        return result.ToHttpResult();
    }
}

public sealed record UpdateChannelSettingsBody(
    string Name,
    bool IsEnabled,
    AdInsertion AdInsertion,
    int AdsPerBreak,
    bool BumpersEnabled,
    BumperSettingsInput Bumper,
    Guid? FillerAssetId
);