GmRelayBot/tests/GmRelay.Bot.Tests/Features/Sessions/CreateSession/Wizard/CreateSessionHandlerBuildCommandTests.cs

using GmRelay.Bot.Features.Sessions.CreateSession;
using GmRelay.Shared.Features.Sessions.CreateSession.Wizard;
using Xunit;

namespace GmRelay.Bot.Tests.Features.Sessions.CreateSession.Wizard;

/// <summary>
/// Regression coverage for <see cref="CreateSessionHandler.BuildCommand"/>:
/// when the wizard payload carries no player limit (e.g. user picked
/// «♾ Без лимита» on the Capacity step), the resulting
/// <c>CreateSessionCommand.MaxPlayers</c> must be <c>null</c> — never <c>0</c>.
/// <c>0</c> would violate the DB CHECK constraint
/// (<c>ck_sessions_max_players</c> in V006) by inserting <c>0</c> instead of
/// <c>NULL</c>, which is the wire-level representation of "no limit".
/// </summary>
public sealed class CreateSessionHandlerBuildCommandTests
{
    [Fact]
    public void BuildCommand_WhenSingleMaxPlayersIsNull_PropagatesNull()
    {
        var draft = new WizardDraft
        {
            Id = Guid.NewGuid(),
            ChatId = "42",
            OwnerId = "100",
            Step = "confirm",
        };
        var payload = new WizardPayload
        {
            Type = WizardCreationType.Single,
            Title = "T",
            System = "Dnd5e",
            DurationMinutes = 240,
            Visibility = WizardVisibility.Public,
            Single = new WizardSingleInput
            {
                ScheduledAt = DateTimeOffset.UtcNow.AddDays(1),
                MaxPlayers = null,
            },
        };

        var cmd = CreateSessionHandler.BuildCommand(
            draft,
            payload,
            new[] { payload.Single!.ScheduledAt!.Value },
            payload.Single.MaxPlayers,
            isOneShot: true);

        Assert.Null(cmd.MaxPlayers);
    }

    [Fact]
    public void BuildCommand_WhenSingleMaxPlayersIsSet_PropagatesValue()
    {
        var draft = new WizardDraft
        {
            Id = Guid.NewGuid(),
            ChatId = "42",
            OwnerId = "100",
            Step = "confirm",
        };
        var payload = new WizardPayload
        {
            Type = WizardCreationType.Single,
            Title = "T",
            System = "Dnd5e",
            DurationMinutes = 240,
            Visibility = WizardVisibility.Public,
            Single = new WizardSingleInput
            {
                ScheduledAt = DateTimeOffset.UtcNow.AddDays(1),
                MaxPlayers = 5,
            },
        };

        var cmd = CreateSessionHandler.BuildCommand(
            draft,
            payload,
            new[] { payload.Single!.ScheduledAt!.Value },
            payload.Single.MaxPlayers,
            isOneShot: true);

        Assert.Equal(5, cmd.MaxPlayers);
    }

    [Fact]
    public void BuildCommand_WhenFormatIsOnline_PropagatesFormatAndJoinLink()
    {
        var draft = new WizardDraft
        {
            Id = Guid.NewGuid(),
            ChatId = "42",
            OwnerId = "100",
            Step = "confirm",
        };
        var payload = new WizardPayload
        {
            Type = WizardCreationType.Single,
            Title = "T",
            System = "Dnd5e",
            DurationMinutes = 240,
            Visibility = WizardVisibility.Public,
            Format = WizardSessionFormat.Online,
            JoinLink = "https://vtt.example/game",
            Single = new WizardSingleInput
            {
                ScheduledAt = DateTimeOffset.UtcNow.AddDays(1),
                MaxPlayers = 4,
            },
        };

        var cmd = CreateSessionHandler.BuildCommand(
            draft,
            payload,
            new[] { payload.Single!.ScheduledAt!.Value },
            payload.Single.MaxPlayers,
            isOneShot: true);

        Assert.Equal("Online", cmd.Format);
        Assert.Equal("https://vtt.example/game", cmd.Link);
        Assert.Null(cmd.LocationAddress);
    }

    [Fact]
    public void BuildCommand_WhenFormatIsOffline_PropagatesFormatAndAddress()
    {
        var draft = new WizardDraft
        {
            Id = Guid.NewGuid(),
            ChatId = "42",
            OwnerId = "100",
            Step = "confirm",
        };
        var payload = new WizardPayload
        {
            Type = WizardCreationType.Single,
            Title = "T",
            System = "Dnd5e",
            DurationMinutes = 240,
            Visibility = WizardVisibility.Public,
            Format = WizardSessionFormat.Offline,
            LocationAddress = "Москва, ул. Кубиков, 12",
            Single = new WizardSingleInput
            {
                ScheduledAt = DateTimeOffset.UtcNow.AddDays(1),
                MaxPlayers = 4,
            },
        };

        var cmd = CreateSessionHandler.BuildCommand(
            draft,
            payload,
            new[] { payload.Single!.ScheduledAt!.Value },
            payload.Single.MaxPlayers,
            isOneShot: true);

        Assert.Equal("Offline", cmd.Format);
        Assert.Equal(string.Empty, cmd.Link);
        Assert.Equal("Москва, ул. Кубиков, 12", cmd.LocationAddress);
    }
}