using ErsatzTV.Application.Channels;
using ErsatzTV.Core;
using LanguageExt;
using ErsatzTV.Core.Domain;
using ErsatzTV.Core.Errors;
using ErsatzTV.Infrastructure.Data;
using ErsatzTV.Tests.Support;
using Microsoft.EntityFrameworkCore;
using NSubstitute;
using NUnit.Framework;
using Shouldly;
using static LanguageExt.Prelude;

namespace ErsatzTV.Tests.Application.Channels;

[TestFixture]
public class CreateChannelHandlerTests : ChannelHandlerTestBase
{
    private CreateChannelHandler MakeHandler() => new(Worker, Db.Factory, SearchTargets, RemoteLogoCacher);

    [Test]
    public async Task Should_Create_Channel_When_Valid()
    {
        await SeedFFmpegProfile();

        Either<BaseError, CreateChannelResult> result =
            await MakeHandler().Handle(MakeCreate(number: "7", name: "News"), CancellationToken.None);

        result.IsRight.ShouldBeTrue();

        await using TvContext context = Db.CreateContext();
        Channel channel = await context.Channels.SingleAsync(c => c.Number == "7" && c.Name == "News");
        channel.Origin.ShouldBe(ChannelOrigin.UserCreated);
    }

    [Test]
    public async Task Should_Reject_Duplicate_Number_With_422_Error()
    {
        await SeedFFmpegProfile();
        await SeedChannel(1, "5");

        Either<BaseError, CreateChannelResult> result =
            await MakeHandler().Handle(MakeCreate(number: "5"), CancellationToken.None);

        BaseError error = LeftOf(result);
        error.ShouldNotBeOfType<NotFoundError>();
        error.Value.ShouldContain("unique");
    }

    [Test]
    public async Task Should_Reject_ShowInEpg_When_Disabled()
    {
        await SeedFFmpegProfile();

        Either<BaseError, CreateChannelResult> result =
            await MakeHandler().Handle(
                MakeCreate(number: "8", isEnabled: false, showInEpg: true),
                CancellationToken.None);

        BaseError error = LeftOf(result);
        error.ShouldNotBeOfType<NotFoundError>();
        error.Value.ShouldContain("EPG");
    }

    [Test]
    public async Task Should_Reject_Invalid_External_Logo_Url()
    {
        await SeedFFmpegProfile();

        Either<BaseError, CreateChannelResult> result =
            await MakeHandler().Handle(
                MakeCreate(number: "9", logoPath: "ftp://example.com/logo.png"),
                CancellationToken.None);

        BaseError error = LeftOf(result);
        error.ShouldNotBeOfType<NotFoundError>();
        error.Value.ShouldContain("logo");
    }

    [Test]
    public async Task Should_Reject_Empty_Group()
    {
        await SeedFFmpegProfile();

        Either<BaseError, CreateChannelResult> result =
            await MakeHandler().Handle(MakeCreate(number: "11", group: "  "), CancellationToken.None);

        BaseError error = LeftOf(result);
        error.ShouldNotBeOfType<NotFoundError>();
        error.Value.ShouldContain("group");
    }

    [Test]
    public async Task Should_Reject_Nonexistent_FFmpegProfile()
    {
        // intentionally do not seed an FFmpegProfile
        Either<BaseError, CreateChannelResult> result =
            await MakeHandler().Handle(MakeCreate(number: "12", ffmpegProfileId: 999), CancellationToken.None);

        BaseError error = LeftOf(result);
        error.ShouldNotBeOfType<NotFoundError>();
        error.Value.ShouldContain("FFmpegProfile");
    }

    [Test]
    public async Task Should_Download_External_Url_Logo_And_Store_Cache_Name()
    {
        await SeedFFmpegProfile();
        RemoteLogoCacher.CacheFromUrl(Arg.Any<Uri>(), Arg.Any<CancellationToken>())
            .Returns(Right<BaseError, string>("cachedhash"));

        Either<BaseError, CreateChannelResult> result = await MakeHandler().Handle(
            MakeCreate(number: "20", logoPath: "https://example.com/logo.png"),
            CancellationToken.None);

        result.IsRight.ShouldBeTrue();
        await using TvContext db = Db.CreateContext();
        Artwork logo = db.Channels.Include(c => c.Artwork).Single(c => c.Number == "20")
            .Artwork.Single(a => a.ArtworkKind == ArtworkKind.Logo);
        logo.Path.ShouldBe("cachedhash");
        logo.IsExternalUrl().ShouldBeFalse();
    }

    [Test]
    public async Task Should_Fail_The_Create_When_The_Logo_Download_Fails()
    {
        await SeedFFmpegProfile();
        RemoteLogoCacher.CacheFromUrl(Arg.Any<Uri>(), Arg.Any<CancellationToken>())
            .Returns(Left<BaseError, string>(BaseError.New("Could not download logo: host timed out")));

        Either<BaseError, CreateChannelResult> result = await MakeHandler().Handle(
            MakeCreate(number: "21", logoPath: "https://example.com/logo.png"),
            CancellationToken.None);

        result.IsLeft.ShouldBeTrue();
        LeftOf(result).Value.ShouldContain("Could not download logo");

        await using TvContext db = Db.CreateContext();
        (await db.Channels.AnyAsync(c => c.Number == "21")).ShouldBeFalse();
    }

    [Test]
    public async Task Should_Not_Call_The_Cacher_For_An_Uploaded_Logo_Path()
    {
        await SeedFFmpegProfile();

        Either<BaseError, CreateChannelResult> result = await MakeHandler().Handle(
            MakeCreate(number: "22", logoPath: "iptv/logos/deadbeef"),
            CancellationToken.None);

        result.IsRight.ShouldBeTrue();
        await RemoteLogoCacher.DidNotReceive().CacheFromUrl(Arg.Any<Uri>(), Arg.Any<CancellationToken>());

        await using TvContext db = Db.CreateContext();
        Artwork logo = db.Channels.Include(c => c.Artwork).Single(c => c.Number == "22")
            .Artwork.Single(a => a.ArtworkKind == ArtworkKind.Logo);
        logo.Path.ShouldBe("deadbeef");
    }

    private static BaseError LeftOf<TR>(Either<BaseError, TR> either) =>
        either.Match(Left: e => e, Right: _ => throw new AssertionException("Expected a Left result"));
}