using Microsoft.EntityFrameworkCore;
using TeleWave.Application.Broadcast;
using TeleWave.Application.Broadcast.AddChannelAd;
using TeleWave.Application.Broadcast.AddChannelShow;
using TeleWave.Application.Broadcast.CreateChannel;
using TeleWave.Application.Broadcast.CreateOverride;
using TeleWave.Application.Broadcast.DeleteOverride;
using TeleWave.Application.Broadcast.RemoveChannelShow;
using TeleWave.Application.Broadcast.UpdateChannelSettings;
using TeleWave.Application.Broadcast.UpdateChannelShow;
using TeleWave.Application.Tests.Support;
using TeleWave.Domain.Broadcast;
using TeleWave.Domain.Library;
using TeleWave.Domain.Media;
using Xunit;

namespace TeleWave.Application.Tests.Broadcast;

public class ChannelHandlersTests
{
    private static readonly DateTimeOffset T0 = new(2026, 1, 1, 0, 0, 0, TimeSpan.Zero);

    [Fact]
    public async Task CreateChannel_Succeeds_AndRejectsDuplicateSlug()
    {
        var fixture = new TestDb();
        await using var db = fixture.New();

        var ok = await new CreateChannelCommandHandler(db).Handle(
            new CreateChannelCommand("News", "news"),
            CancellationToken.None
        );
        Assert.True(ok.IsSuccess);
        await db.SaveChangesAsync(CancellationToken.None);

        var dup = await new CreateChannelCommandHandler(db).Handle(
            new CreateChannelCommand("Other", "news"),
            CancellationToken.None
        );
        Assert.False(dup.IsSuccess);
        Assert.Equal(ChannelErrors.DuplicateSlug, dup.Error);
    }

    [Fact]
    public async Task AddChannelShow_HappyPath_AndErrors()
    {
        var fixture = new TestDb();
        var channel = Channel.Create("c", "c", T0);
        var show = Show.Create("S", ShowKind.Series);
        await using (var seed = fixture.New())
        {
            seed.Channels.Add(channel);
            seed.Shows.Add(show);
            await seed.SaveChangesAsync(CancellationToken.None);
        }

        await using var db = fixture.New();
        var handler = new AddChannelShowCommandHandler(db);

        // неизвестный канал
        var noChannel = await handler.Handle(
            new AddChannelShowCommand(Guid.NewGuid(), show.Id, 1, BlockMode.Count, 1),
            CancellationToken.None
        );
        Assert.Equal(ChannelErrors.NotFound, noChannel.Error);

        // неизвестное шоу
        var noShow = await handler.Handle(
            new AddChannelShowCommand(channel.Id, Guid.NewGuid(), 1, BlockMode.Count, 1),
            CancellationToken.None
        );
        Assert.Equal(ChannelErrors.ShowNotFound, noShow.Error);

        // ок
        var ok = await handler.Handle(
            new AddChannelShowCommand(channel.Id, show.Id, 2, BlockMode.Count, 3),
            CancellationToken.None
        );
        Assert.True(ok.IsSuccess);
        await db.SaveChangesAsync(CancellationToken.None);

        // повторно — уже добавлено
        await using var db2 = fixture.New();
        var dup = await new AddChannelShowCommandHandler(db2).Handle(
            new AddChannelShowCommand(channel.Id, show.Id, 1, BlockMode.Count, 1),
            CancellationToken.None
        );
        Assert.Equal(ChannelErrors.ShowAlreadyAdded, dup.Error);
    }

    [Fact]
    public async Task RemoveChannelShow_RemovesOrReportsNotFound()
    {
        var fixture = new TestDb();
        var channel = Channel.Create("c", "c", T0);
        var cs = channel.AddShow(Guid.NewGuid(), 1, BlockMode.Count, 1);
        await using (var seed = fixture.New())
        {
            seed.Channels.Add(channel);
            await seed.SaveChangesAsync(CancellationToken.None);
        }

        await using var db = fixture.New();
        var handler = new RemoveChannelShowCommandHandler(db);

        var missing = await handler.Handle(
            new RemoveChannelShowCommand(channel.Id, Guid.NewGuid()),
            CancellationToken.None
        );
        Assert.Equal(ChannelErrors.ChannelShowNotFound, missing.Error);

        var ok = await handler.Handle(
            new RemoveChannelShowCommand(channel.Id, cs.Id),
            CancellationToken.None
        );
        Assert.True(ok.IsSuccess);
    }

    [Fact]
    public async Task AddChannelAd_HappyPath_AndAssetNotFound()
    {
        var fixture = new TestDb();
        var channel = Channel.Create("c", "c", T0);
        var asset = MediaAsset.Register("clip.mp4", ".mp4", MediaSource.Upload);
        await using (var seed = fixture.New())
        {
            seed.Channels.Add(channel);
            seed.MediaAssets.Add(asset);
            await seed.SaveChangesAsync(CancellationToken.None);
        }

        await using var db = fixture.New();
        var handler = new AddChannelAdCommandHandler(db);

        var noAsset = await handler.Handle(
            new AddChannelAdCommand(channel.Id, Guid.NewGuid()),
            CancellationToken.None
        );
        Assert.Equal(ChannelErrors.AssetNotFound, noAsset.Error);

        var ok = await handler.Handle(
            new AddChannelAdCommand(channel.Id, asset.Id),
            CancellationToken.None
        );
        Assert.True(ok.IsSuccess);
    }

    [Fact]
    public async Task UpdateChannelSettings_UpdatesBumperChances()
    {
        var fixture = new TestDb();
        var channel = Channel.Create("c", "c", T0);
        await using (var seed = fixture.New())
        {
            seed.Channels.Add(channel);
            await seed.SaveChangesAsync(CancellationToken.None);
        }

        await using var db = fixture.New();
        var result = await new UpdateChannelSettingsCommandHandler(db).Handle(
            new UpdateChannelSettingsCommand(
                channel.Id,
                "c",
                true,
                AdInsertion.BetweenBlocks,
                1,
                true,
                new BumperSettingsInput(
                    BumperFont.Sans,
                    5,
                    BumperSelection.WeightedRandom,
                    0.5,
                    0.2
                ),
                null
            ),
            CancellationToken.None
        );
        Assert.True(result.IsSuccess);
        await db.SaveChangesAsync(CancellationToken.None);

        await using var verify = fixture.New();
        var stored = await verify.Channels.FindAsync(channel.Id);
        Assert.Equal(0.5, stored!.BumperShowChangeChance);
        Assert.Equal(0.2, stored.BumperEpisodeChangeChance);
        Assert.Equal(BumperSelection.WeightedRandom, stored.BumperSelection);
    }

    [Fact]
    public async Task UpdateChannelShow_SetsPreferredHours()
    {
        var fixture = new TestDb();
        var channel = Channel.Create("c", "c", T0);
        var cs = channel.AddShow(Guid.NewGuid(), 1, BlockMode.Count, 1);
        await using (var seed = fixture.New())
        {
            seed.Channels.Add(channel);
            await seed.SaveChangesAsync(CancellationToken.None);
        }

        await using var db = fixture.New();
        var result = await new UpdateChannelShowCommandHandler(db).Handle(
            new UpdateChannelShowCommand(
                channel.Id,
                cs.Id,
                3,
                BlockMode.Count,
                2,
                true,
                4,
                [new HourWindowInput(18, 23)]
            ),
            CancellationToken.None
        );
        Assert.True(result.IsSuccess);
        await db.SaveChangesAsync(CancellationToken.None);

        await using var verify = fixture.New();
        var stored = await verify
            .Channels.Include(c => c.Shows)
                .ThenInclude(s => s.PreferredHours)
            .FirstAsync(c => c.Id == channel.Id);
        var show = Assert.Single(stored.Shows);
        Assert.Equal(4, show.PreferredWeightMultiplier);
        Assert.Single(show.PreferredHours);
    }

    [Fact]
    public async Task CreateOverride_OneTime_Weekly_AndValidation()
    {
        var fixture = new TestDb();
        var channel = Channel.Create("c", "c", T0);
        var show = Show.Create("S", ShowKind.Series);
        await using (var seed = fixture.New())
        {
            seed.Channels.Add(channel);
            seed.Shows.Add(show);
            await seed.SaveChangesAsync(CancellationToken.None);
        }

        await using var db = fixture.New();
        var handler = new CreateProgrammingOverrideCommandHandler(db);
        OverrideShowInput[] shows = [new OverrideShowInput(show.Id, 1)];

        // Разовое окно — ок.
        var oneTime = await handler.Handle(
            new CreateProgrammingOverrideCommand(
                channel.Id,
                OverrideMode.Exclusive,
                OverrideRecurrence.OneTime,
                T0,
                T0.AddHours(2),
                null,
                null,
                null,
                shows
            ),
            CancellationToken.None
        );
        Assert.True(oneTime.IsSuccess);

        // Еженедельное — ок.
        var weekly = await handler.Handle(
            new CreateProgrammingOverrideCommand(
                channel.Id,
                OverrideMode.Boost,
                OverrideRecurrence.Weekly,
                null,
                null,
                6,
                600,
                720,
                shows
            ),
            CancellationToken.None
        );
        Assert.True(weekly.IsSuccess);

        // Невалидное окно (end <= start).
        var bad = await handler.Handle(
            new CreateProgrammingOverrideCommand(
                channel.Id,
                OverrideMode.Exclusive,
                OverrideRecurrence.OneTime,
                T0.AddHours(2),
                T0,
                null,
                null,
                null,
                shows
            ),
            CancellationToken.None
        );
        Assert.Equal(ChannelErrors.InvalidOverrideWindow, bad.Error);
    }

    [Fact]
    public async Task DeleteOverride_RemovesOrReportsNotFound()
    {
        var fixture = new TestDb();
        var channel = Channel.Create("c", "c", T0);
        var ovr = channel.AddOverride(OverrideMode.Exclusive, T0, T0.AddHours(1));
        await using (var seed = fixture.New())
        {
            seed.Channels.Add(channel);
            await seed.SaveChangesAsync(CancellationToken.None);
        }

        await using var db = fixture.New();
        var handler = new DeleteProgrammingOverrideCommandHandler(db);

        var missing = await handler.Handle(
            new DeleteProgrammingOverrideCommand(channel.Id, Guid.NewGuid()),
            CancellationToken.None
        );
        Assert.Equal(ChannelErrors.OverrideNotFound, missing.Error);

        var ok = await handler.Handle(
            new DeleteProgrammingOverrideCommand(channel.Id, ovr.Id),
            CancellationToken.None
        );
        Assert.True(ok.IsSuccess);
    }
}