namespace HSchool.People.Tests;

public class OpinionGeneratorTests
{
    [Fact]
    public void ParentAndChild_HavePositiveOpinionsBothWays_AfterGeneration()
    {
        var roster = Fixtures.Generate(Fixtures.Classrooms(4));
        var people = roster.People.ToDictionary(person => person.Id, StringComparer.Ordinal);

        var child = roster.People.First(person => person.IsStudent && !person.IsParent);
        var family = roster.Families.Single(row => row.Id.Equals(child.FamilyId, StringComparison.Ordinal));
        Assert.NotEmpty(family.ParentIds);

        foreach (var parentId in family.ParentIds)
        {
            Assert.True(child.Opinions.TryGetValue(parentId, out var toParent));
            Assert.True(toParent > 0);

            var parent = people[parentId];
            Assert.True(parent.Opinions.TryGetValue(child.Id, out var toChild));
            Assert.True(toChild > 0);
        }
    }

    [Fact]
    public void Classmates_HaveNoOpinionEntry_AfterGeneration()
    {
        var roster = Fixtures.Generate(Fixtures.Classrooms(4));
        var pupils = roster.People.Where(person => person.IsStudent).ToArray();
        Assert.True(pupils.Length >= 2);

        var first = pupils[0];
        var classmate = pupils.First(person =>
            person.Id != first.Id
            && !OpinionStore.FamilyMemberIds(roster, first).Contains(person.Id));

        Assert.False(first.Opinions.ContainsKey(classmate.Id));
        Assert.False(classmate.Opinions.ContainsKey(first.Id));
    }

    [Fact]
    public void ParentToChild_AndChildToParent_CanDiffer()
    {
        var roster = Fixtures.Generate(Fixtures.Classrooms(4));
        var people = roster.People.ToDictionary(person => person.Id, StringComparer.Ordinal);
        var child = roster.People.First(person => person.IsStudent && !person.IsParent);
        var parentId = roster.Families.Single(row => row.Id.Equals(child.FamilyId, StringComparison.Ordinal)).ParentIds[0];
        var parent = people[parentId];

        Assert.True(parent.Opinions.TryGetValue(child.Id, out var parentView));
        Assert.True(child.Opinions.TryGetValue(parentId, out var childView));
        Assert.NotEqual(parentView, childView);
    }
}