namespace HSchool.Simulation.Tests;

/// <summary>
/// What used to be checked through <c>SchoolRegistry</c>. The registry is gone — the server gives
/// every school its own worker — but the name and start-date rules it guarded are still the ones
/// the create endpoint applies.
/// </summary>
public class SchoolNamesTests
{
    [Theory]
    [InlineData(null)]
    [InlineData("")]
    [InlineData("   ")]
    [InlineData("\u0009\u000A")]
    public void BlankNames_AreRejected(string? name)
    {
        Assert.False(SchoolNames.TryNormalize(name, out _));
    }

    [Fact]
    public void OverlongNames_AreRejected()
    {
        Assert.False(SchoolNames.TryNormalize(new string('ш', School.MaxNameLength + 1), out _));
        Assert.True(SchoolNames.TryNormalize(new string('ш', School.MaxNameLength), out _));
    }

    [Fact]
    public void SurroundingSpaceAndControlCharacters_AreStripped()
    {
        Assert.True(SchoolNames.TryNormalize("  Лицей  ", out var normalized));
        Assert.Equal("Лицей", normalized);
    }

    [Fact]
    public void StartDatesOutsideTheSupportedRange_AreRejected()
    {
        Assert.False(GameClock.IsValidStartDate(new DateTime(1500, 1, 1, 0, 0, 0, DateTimeKind.Utc)));
        Assert.False(GameClock.IsValidStartDate(new DateTime(3200, 1, 1, 0, 0, 0, DateTimeKind.Utc)));
        Assert.True(GameClock.IsValidStartDate(new DateTime(2012, 4, 3, 6, 0, 0, DateTimeKind.Utc)));
    }

    [Fact]
    public void SuggestedNames_AreUsableAndNeverRepeatATakenOne()
    {
        var generator = new SchoolNameGenerator(new Random(1234));
        var taken = new List<string>();

        for (var i = 0; i < 20; i++)
        {
            var suggestion = generator.Next(taken, SchoolNameLanguage.Russian);
            Assert.True(SchoolNames.TryNormalize(suggestion, out _), $"\"{suggestion}\" is not a usable name.");
            Assert.DoesNotContain(suggestion, taken, StringComparer.OrdinalIgnoreCase);
            taken.Add(suggestion);
        }
    }

    [Fact]
    public void SuggestedNames_FitTheNameLimitInBothLanguages()
    {
        var generator = new SchoolNameGenerator(new Random(1234));

        foreach (var language in new[] { SchoolNameLanguage.Russian, SchoolNameLanguage.English })
        {
            for (var i = 0; i < 200; i++)
            {
                Assert.InRange(generator.Next([], language).Length, 1, School.MaxNameLength);
            }
        }
    }

    [Fact]
    public void SuggestedEnglishNames_AreAscii()
    {
        var generator = new SchoolNameGenerator(new Random(1234));

        for (var i = 0; i < 50; i++)
        {
            Assert.Matches("^[A-Za-z0-9 .]+$", generator.Next([], SchoolNameLanguage.English));
        }
    }
}