namespace HSchool.People.Tests;

public class HealthConditionTests
{
    [Fact]
    public void SameSeed_YieldsSameSeverityCurve()
    {
        var started = new DateTime(2012, 4, 3, 8, 0, 0, DateTimeKind.Utc);
        var first = Blank("p1");
        var second = Blank("p1");
        HealthConditions.Add(first, Artificial(started, severity: 0.2f));
        HealthConditions.Add(second, Artificial(started, severity: 0.2f));

        Assert.True(HealthConditions.Tick(first, peopleSeed: 7, dayNumber: 100, gameMinutes: 24 * 60));
        Assert.True(HealthConditions.Tick(second, peopleSeed: 7, dayNumber: 100, gameMinutes: 24 * 60));

        Assert.Equal(first.Conditions![0].Severity, second.Conditions![0].Severity);
        Assert.True(first.Conditions[0].Severity > 0.2f);
    }

    [Fact]
    public void DifferentDaySeed_ChangesTheCurve()
    {
        var started = new DateTime(2012, 4, 3, 8, 0, 0, DateTimeKind.Utc);
        var a = Blank("p1");
        var b = Blank("p1");
        HealthConditions.Add(a, Artificial(started, severity: 0.2f));
        HealthConditions.Add(b, Artificial(started, severity: 0.2f));

        HealthConditions.Tick(a, peopleSeed: 7, dayNumber: 100, gameMinutes: 24 * 60);
        HealthConditions.Tick(b, peopleSeed: 7, dayNumber: 101, gameMinutes: 24 * 60);

        Assert.NotEqual(a.Conditions![0].Severity, b.Conditions![0].Severity);
    }

    [Fact]
    public void RosterJson_RoundTripsConditions_AndOmitsHealthy()
    {
        var roster = Fixtures.Generate(Fixtures.Classrooms(4));
        var pupil = roster.People.First(person => person.IsStudent && !person.IsParent);
        var started = new DateTime(2012, 4, 3, 9, 0, 0, DateTimeKind.Utc);
        HealthConditions.Add(pupil, Artificial(started, severity: 0.35f, defName: "TestCold"));
        HealthConditions.Add(
            pupil,
            new HealthCondition
            {
                DefName = "TestStomach",
                Severity = 0.15f,
                Progress = 0.05f,
                Source = "idiopathic",
                StartedAt = started.AddHours(1),
                SeverityPerDay = 0.05f,
                ProgressPerDay = 0.02f,
            });

        var json = RosterJson.Serialize(RosterDocument.From(1, roster));
        Assert.Contains("\"conditions\"", json, StringComparison.Ordinal);
        Assert.Contains("\"defName\": \"TestCold\"", json, StringComparison.Ordinal);
        Assert.Contains("\"defName\": \"TestStomach\"", json, StringComparison.Ordinal);

        var healthy = roster.People.First(person => person.Conditions is null || person.Conditions.Count == 0);
        var healthySlice = PersonJsonSlice(json, healthy.Id);
        Assert.DoesNotContain("\"conditions\"", healthySlice, StringComparison.Ordinal);

        var loaded = RosterJson.Parse(json).ToRoster();
        var loadedPupil = loaded.People.First(person => person.Id.Equals(pupil.Id, StringComparison.Ordinal));
        Assert.NotNull(loadedPupil.Conditions);
        Assert.Equal(2, loadedPupil.Conditions!.Count);
        Assert.Equal("TestCold", loadedPupil.Conditions[0].DefName);
        Assert.Equal(0.35f, loadedPupil.Conditions[0].Severity);
        Assert.Equal("cold", loadedPupil.Conditions[0].Source);
        Assert.Equal(started, loadedPupil.Conditions[0].StartedAt);
        Assert.Equal("TestStomach", loadedPupil.Conditions[1].DefName);
        Assert.Equal(0.15f, loadedPupil.Conditions[1].Severity);
    }

    [Fact]
    public void TwoConditions_DoNotOverwriteEachOther()
    {
        var person = Blank("p1");
        var started = new DateTime(2012, 4, 3, 8, 0, 0, DateTimeKind.Utc);
        HealthConditions.Add(person, Artificial(started, severity: 0.4f, defName: "A"));
        HealthConditions.Add(person, Artificial(started, severity: 0.1f, defName: "B"));

        Assert.Equal(2, person.Conditions!.Count);
        Assert.Equal("A", person.Conditions[0].DefName);
        Assert.Equal(0.4f, person.Conditions[0].Severity);
        Assert.Equal("B", person.Conditions[1].DefName);
        Assert.Equal(0.1f, person.Conditions[1].Severity);

        HealthConditions.Tick(person, peopleSeed: 3, dayNumber: 50, gameMinutes: 60);
        Assert.Equal(2, person.Conditions.Count);
        Assert.Equal("A", person.Conditions[0].DefName);
        Assert.Equal("B", person.Conditions[1].DefName);
        Assert.True(person.Conditions[0].Severity > 0.4f);
        Assert.True(person.Conditions[1].Severity > 0.1f);
    }

    private static HealthCondition Artificial(
        DateTime started,
        float severity,
        string defName = "TestCold") =>
        new()
        {
            DefName = defName,
            Severity = severity,
            Progress = 0f,
            Source = "cold",
            StartedAt = DateTime.SpecifyKind(started, DateTimeKind.Utc),
            SeverityPerDay = 0.2f,
            ProgressPerDay = 0.1f,
        };

    private static string PersonJsonSlice(string json, string personId)
    {
        var marker = $"\"id\": \"{personId}\"";
        var start = json.IndexOf(marker, StringComparison.Ordinal);
        Assert.True(start >= 0);
        var end = json.IndexOf("},", start, StringComparison.Ordinal);
        if (end < 0)
        {
            end = json.Length;
        }

        return json[start..end];
    }

    private static Person Blank(string id)
    {
        var cases = new CaseTable
        {
            Nom = id,
            Gen = id,
            Dat = id,
            Acc = id,
            Ins = id,
            Pre = id,
        };
        return new Person
        {
            Id = id,
            FamilyId = "f",
            Female = false,
            BirthDate = new DateTime(2000, 1, 1, 0, 0, 0, DateTimeKind.Utc),
            Name = new PersonName(id, id, id, cases, cases, cases),
            IsStudent = true,
            IsStaff = false,
            IsParent = false,
            Numbers = new Dictionary<string, int>(StringComparer.Ordinal),
            Choices = new Dictionary<string, string>(StringComparer.Ordinal),
            Skills = new Dictionary<string, int>(StringComparer.Ordinal),
            Traits = [],
            Needs = new Dictionary<string, float>(StringComparer.Ordinal),
            Opinions = new Dictionary<string, int>(StringComparer.Ordinal),
        };
    }
}