namespace HSchool.People.Tests;

public class DressGeneratorTests
{
    [Fact]
    public void SameSeedCountryMapAndLanguage_YieldTheSameItemsColorsAndPlaces()
    {
        var map = Fixtures.Classrooms(11);
        var a = Fixtures.Generate(map);
        var b = Fixtures.Generate(map);

        Assert.Equal(ItemsSnapshot(a), ItemsSnapshot(b));
    }

    [Fact]
    public void WornLayers_DoNotOverlap_AndADressFillsBottomAndTop()
    {
        var catalog = Fixtures.Catalog();
        var roster = Fixtures.Generate(Fixtures.Classrooms(11));

        foreach (var person in roster.People)
        {
            var occupied = new HashSet<string>(StringComparer.Ordinal);
            foreach (var item in person.Items.Where(row => row.Location == ItemLocations.Worn))
            {
                Assert.True(catalog.Things.TryGetValue(item.Def, out var def));
                foreach (var layer in def.Layers)
                {
                    Assert.True(occupied.Add(layer), $"{person.Id} wears two things on {layer}.");
                }
            }
        }

        Assert.Contains(
            roster.People,
            person => person.Items.Any(item =>
                item.Location == ItemLocations.Worn && item.Def.Equals("Dress", StringComparison.Ordinal)));
        var dressed = roster.People.First(person =>
            person.Items.Any(item => item.Location == ItemLocations.Worn && item.Def == "Dress"));
        var worn = dressed.Items.Where(item => item.Location == ItemLocations.Worn).Select(item => item.Def).ToHashSet();
        Assert.DoesNotContain("TShirt", worn);
        Assert.DoesNotContain("Shirt", worn);
        Assert.DoesNotContain("Skirt", worn);
        Assert.DoesNotContain("Pants", worn);
    }

    [Fact]
    public void Men_DoNotWearSkirts_AndWornColors_AreNotBright()
    {
        var catalog = Fixtures.Catalog();
        var roster = Fixtures.Generate(Fixtures.Classrooms(11));

        foreach (var person in roster.People)
        {
            foreach (var item in person.Items.Where(row => row.Location == ItemLocations.Worn))
            {
                Assert.True(catalog.Things.TryGetValue(item.Def, out var def));
                if (!person.Female)
                {
                    Assert.False(
                        def.Sex is not null && def.Sex.Equals("female", StringComparison.OrdinalIgnoreCase),
                        $"{person.Id} wears {item.Def}.");
                }

                if (item.Color is { } color
                    && catalog.Colors.TryGetValue(color, out var colorDef))
                {
                    Assert.DoesNotContain(ColorTags.Bright, colorDef.Tags, StringComparer.Ordinal);
                }
            }
        }
    }

    [Fact]
    public void PupilInAMathematicsYear_HasAMathematicsTextbook()
    {
        var roster = Fixtures.Generate(Fixtures.Classrooms(11));
        var years = roster.Classes.ToDictionary(row => row.Id, row => row.Year, StringComparer.Ordinal);
        var pupil = roster.People.First(person =>
            person.IsStudent
            && person.ClassId is { } classId
            && years[classId] >= 5);

        Assert.Contains(
            pupil.Items,
            item => item.Def.Equals("Textbook", StringComparison.Ordinal)
                && item.Subject is not null
                && item.Subject.Equals("Mathematics", StringComparison.Ordinal));
    }

    [Fact]
    public void ParentsAndApplicants_AreDressed()
    {
        var catalog = Fixtures.Catalog();
        var roster = Fixtures.Generate(Fixtures.VanillaMap());
        var pool = ApplicantPool.Create(catalog, roster, Fixtures.SchoolSeed, "Russia", Fixtures.AsOf);

        Assert.Contains(roster.People, person => person.IsParent);
        Assert.All(
            roster.People.Where(person => person.IsParent),
            parent => Assert.Contains(parent.Items, item => item.Location == ItemLocations.Worn));
        Assert.NotEmpty(pool.Applicants);
        Assert.All(
            pool.Applicants,
            applicant => Assert.Contains(applicant.Person.Items, item => item.Location == ItemLocations.Worn));
    }

    [Fact]
    public void BagMass_DoesNotExceedCapacity()
    {
        var catalog = Fixtures.Catalog();
        var roster = Fixtures.Generate(Fixtures.Classrooms(11));
        var pool = ApplicantPool.Create(catalog, roster, Fixtures.SchoolSeed, "Russia", Fixtures.AsOf);

        foreach (var person in roster.People.Concat(pool.Applicants.Select(row => row.Person)))
        {
            var held = CarryMass.Held(catalog, person.Items);
            var cap = CarryMass.Capacity(catalog, person.Skills);
            Assert.True(held <= cap, $"{person.Id} carries {held} over {cap}.");
        }
    }

    [Fact]
    public void PeopleJsonWithoutInventory_IsDressedOnEnsure()
    {
        var catalog = Fixtures.Catalog();
        var roster = Fixtures.Generate(Fixtures.Classrooms(4));
        var stripped = new Roster(
            roster.People.Select(person => person with { Items = [] }).ToArray(),
            roster.Families,
            roster.Classes);

        Assert.True(DressGenerator.NeedsDressing(catalog, stripped, ApplicantPool.Empty));
        var dressed = DressGenerator.EnsureRoster(catalog, stripped, Fixtures.SchoolSeed, Fixtures.AsOf);
        Assert.False(DressGenerator.NeedsDressing(catalog, dressed, ApplicantPool.Empty));
        Assert.Equal(ItemsSnapshot(roster), ItemsSnapshot(dressed));
    }

    [Fact]
    public void Underwear_IsSplitBySex_AndAdultFemalesWearABra()
    {
        var roster = Fixtures.Generate(Fixtures.Classrooms(11));
        var bras = new HashSet<string>(StringComparer.Ordinal) { "Bra", "SportsBra", "SoftBra" };

        foreach (var person in roster.People)
        {
            var worn = person.Items
                .Where(item => item.Location == ItemLocations.Worn)
                .Select(item => item.Def)
                .ToHashSet(StringComparer.Ordinal);

            Assert.DoesNotContain("Underwear", worn);
            if (person.Female)
            {
                Assert.Contains("Panties", worn);
                Assert.DoesNotContain("Briefs", worn);
                Assert.DoesNotContain("Boxers", worn);
                if (person.AgeOn(Fixtures.AsOf) >= 11)
                {
                    Assert.True(worn.Overlaps(bras), $"{person.Id} age {person.AgeOn(Fixtures.AsOf)} has no bra.");
                }
                else
                {
                    Assert.False(worn.Overlaps(bras), $"{person.Id} is too young for a bra.");
                }
            }
            else
            {
                Assert.True(worn.Contains("Briefs") || worn.Contains("Boxers"), $"{person.Id} has no male underwear.");
                Assert.DoesNotContain("Panties", worn);
                Assert.False(worn.Overlaps(bras), $"{person.Id} wears a bra.");
            }
        }
    }

    [Fact]
    public void EveryoneHasHauling()
    {
        var roster = Fixtures.Generate(Fixtures.Classrooms(4));
        Assert.All(roster.People, person => Assert.True(person.Skills.ContainsKey("Hauling")));
    }

    [Fact]
    public void AbstractUnderwearInASave_IsRedressedOnEnsure()
    {
        var catalog = Fixtures.Catalog();
        var roster = Fixtures.Generate(Fixtures.Classrooms(4));
        var broken = new Roster(
            roster.People.Select(person =>
            {
                var items = person.Items.Select(item =>
                    item.Def.Equals("Briefs", StringComparison.Ordinal)
                    || item.Def.Equals("Boxers", StringComparison.Ordinal)
                    || item.Def.Equals("Panties", StringComparison.Ordinal)
                        ? item with { Def = "Underwear" }
                        : item).ToArray();
                return person with { Items = items };
            }).ToArray(),
            roster.Families,
            roster.Classes);

        Assert.True(DressGenerator.NeedsDressing(catalog, broken, ApplicantPool.Empty));
        var dressed = DressGenerator.EnsureRoster(catalog, broken, Fixtures.SchoolSeed, Fixtures.AsOf);
        Assert.False(DressGenerator.NeedsDressing(catalog, dressed, ApplicantPool.Empty));
        Assert.Equal(ItemsSnapshot(roster), ItemsSnapshot(dressed));
        Assert.DoesNotContain(
            dressed.People.SelectMany(person => person.Items),
            item => item.Def.Equals("Underwear", StringComparison.Ordinal));
    }

    private static string ItemsSnapshot(Roster roster) =>
        string.Join(
            '\n',
            roster.People.OrderBy(person => person.Id, StringComparer.Ordinal).Select(person =>
                $"{person.Id}|" + string.Join(
                    ',',
                    person.Items.Select(item =>
                        $"{item.Def}:{item.Color ?? "-"}:{item.Location}:{item.Subject ?? "-"}:{item.Condition}"))));
}