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

namespace ErsatzTV.Tests.Application.Channels;

[TestFixture]
public class UpdateChannelNumbersHandlerTests : ChannelHandlerTestBase
{
    private UpdateChannelNumbersHandler MakeHandler() => new(Db.Factory, Worker);

    [Test]
    public async Task Should_Renumber_All_Channels()
    {
        await SeedChannel(1, "5");
        await SeedChannel(2, "6");

        Option<BaseError> result = await MakeHandler().Handle(
            new UpdateChannelNumbers(
            [
                new ChannelSortViewModel { Id = 1, Number = "10" },
                new ChannelSortViewModel { Id = 2, Number = "11.1" }
            ]),
            CancellationToken.None);

        result.IsNone.ShouldBeTrue();

        await using TvContext context = Db.CreateContext();
        var channels = await context.Channels
            .OrderBy(c => c.Id)
            .Select(c => new { c.Number, c.SortNumber })
            .ToListAsync();
        channels[0].Number.ShouldBe("10");
        channels[0].SortNumber.ShouldBe(10);
        channels[1].Number.ShouldBe("11.1");
        channels[1].SortNumber.ShouldBe(11.1);
    }

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

        Option<BaseError> result = await MakeHandler().Handle(
            new UpdateChannelNumbers(
            [
                new ChannelSortViewModel { Id = 1, Number = "10" },
                new ChannelSortViewModel { Id = 99, Number = "11" }
            ]),
            CancellationToken.None);

        BaseError error = ErrorOf(result);
        error.ShouldBeOfType<NotFoundError>();

        await using TvContext context = Db.CreateContext();
        string number = await context.Channels.Where(c => c.Id == 1).Select(c => c.Number).SingleAsync();
        number.ShouldBe("5");
    }

    [Test]
    public async Task Should_Reject_Duplicate_Numbers_And_Not_Renumber()
    {
        await SeedChannel(1, "5");
        await SeedChannel(2, "6");

        Option<BaseError> result = await MakeHandler().Handle(
            new UpdateChannelNumbers(
            [
                new ChannelSortViewModel { Id = 1, Number = "10" },
                new ChannelSortViewModel { Id = 2, Number = "10" }
            ]),
            CancellationToken.None);

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

        await using TvContext context = Db.CreateContext();
        List<string> numbers = await context.Channels.OrderBy(c => c.Id).Select(c => c.Number).ToListAsync();
        numbers.ShouldBe(["5", "6"]);
    }

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

        Option<BaseError> result = await MakeHandler().Handle(
            new UpdateChannelNumbers([new ChannelSortViewModel { Id = 1, Number = "10.123" }]),
            CancellationToken.None);

        BaseError error = ErrorOf(result);
        error.ShouldNotBeOfType<NotFoundError>();
        error.Value.ShouldContain("Invalid channel number");

        await using TvContext context = Db.CreateContext();
        string number = await context.Channels.Where(c => c.Id == 1).Select(c => c.Number).SingleAsync();
        number.ShouldBe("5");
    }

    private static BaseError ErrorOf(Option<BaseError> result) =>
        result.Match(
            Some: error => error,
            None: () => throw new AssertionException("Expected an error"));
}