Add opinions storage, morning drift, and Connections card tab.

src/HSchool.People/OpinionGenerator.cs

@@ -0,0 +1,97 @@
+using HSchool.Content;
+
+namespace HSchool.People;
+
+/// <summary>Seeds family opinions at generation or when an old save lacks them.</summary>
+public static class OpinionGenerator
+{
+    public static Roster SeedFamily(DefCatalog catalog, Roster roster)
+    {
+        ArgumentNullException.ThrowIfNull(catalog);
+        ArgumentNullException.ThrowIfNull(roster);
+
+        var rules = catalog.BehaviorRules;
+        if (rules is null)
+        {
+            return roster;
+        }
+
+        var people = new Person[roster.People.Count];
+        var changed = false;
+        for (var i = 0; i < roster.People.Count; i++)
+        {
+            var person = roster.People[i];
+            var updated = SeedPersonFamilyOpinions(roster, rules, roster.People, person);
+            people[i] = updated;
+            changed |= !ReferenceEquals(updated, person);
+        }
+
+        return changed ? roster with { People = people } : roster;
+    }
+
+    public static bool NeedsFamilyOpinions(Roster roster)
+    {
+        var people = roster.People.ToDictionary(person => person.Id, StringComparer.Ordinal);
+        foreach (var family in roster.Families)
+        {
+            foreach (var childId in family.ChildIds)
+            {
+                if (!people.TryGetValue(childId, out var child))
+                {
+                    continue;
+                }
+
+                foreach (var parentId in family.ParentIds)
+                {
+                    if (!child.Opinions.ContainsKey(parentId))
+                    {
+                        return true;
+                    }
+                }
+            }
+        }
+
+        return false;
+    }
+
+    public static Person EnsureMutableOpinions(Person person)
+    {
+        if (person.Opinions is Dictionary<string, int>)
+        {
+            return person;
+        }
+
+        return person with
+        {
+            Opinions = new Dictionary<string, int>(person.Opinions, StringComparer.Ordinal),
+        };
+    }
+
+    private static Person SeedPersonFamilyOpinions(
+        Roster roster,
+        BehaviorDef rules,
+        IReadOnlyList<Person> rosterPeople,
+        Person person)
+    {
+        var mutable = EnsureMutableOpinions(person);
+        var changed = !ReferenceEquals(mutable, person);
+        var peopleById = rosterPeople.ToDictionary(row => row.Id, StringComparer.Ordinal);
+        foreach (var targetId in OpinionStore.FamilyMemberIds(roster, person))
+        {
+            if (!peopleById.TryGetValue(targetId, out var target))
+            {
+                continue;
+            }
+
+            var basis = OpinionStore.FamilyBasis(roster, rules, mutable, target);
+            if (basis == 0 || mutable.Opinions.ContainsKey(targetId))
+            {
+                continue;
+            }
+
+            changed |= OpinionStore.Set(mutable, targetId, basis);
+        }
+
+        return changed ? mutable : person;
+    }
+}

src/HSchool.People/OpinionLabels.cs

@@ -0,0 +1,30 @@
+using HSchool.Content;
+
+namespace HSchool.People;
+
+/// <summary>Threshold captions live in the catalog. The client draws what it is told.</summary>
+public static class OpinionLabels
+{
+    public const int MinValue = -100;
+    public const int MaxValue = 100;
+
+    public static string BandId(BehaviorDef? rules, int value)
+    {
+        var bands = rules?.OpinionBands is { Count: > 0 } listed
+            ? listed
+            : BehaviorDef.DefaultOpinionBands;
+        OpinionBand? best = null;
+        foreach (var band in bands)
+        {
+            if (value >= band.Min && (best is null || band.Min > best.Min))
+            {
+                best = band;
+            }
+        }
+
+        return best?.Id ?? "OpinionAcquaintance";
+    }
+
+    public static string Label(DefCatalog catalog, string locale, int value) =>
+        catalog.Text(locale, BandId(catalog.BehaviorRules, value));
+}

src/HSchool.People/OpinionStore.cs

@@ -0,0 +1,147 @@
+using HSchool.Content;
+
+namespace HSchool.People;
+
+/// <summary>Sparse A→B opinions on a person. Zero is not stored.</summary>
+public static class OpinionStore
+{
+    public static int? Get(Person person, string targetId) =>
+        person.Opinions.TryGetValue(targetId, out var value) ? value : null;
+
+    public static bool Set(Person person, string targetId, int value)
+    {
+        value = Math.Clamp(value, OpinionLabels.MinValue, OpinionLabels.MaxValue);
+        if (value == 0)
+        {
+            return Remove(person, targetId);
+        }
+
+        if (person.Opinions is not IDictionary<string, int> dict)
+        {
+            throw new InvalidOperationException($"Cannot mutate opinions for {person.Id}.");
+        }
+
+        if (dict.IsReadOnly)
+        {
+            throw new InvalidOperationException($"Cannot mutate opinions for {person.Id}.");
+        }
+
+        if (dict.TryGetValue(targetId, out var existing) && existing == value)
+        {
+            return false;
+        }
+
+        dict[targetId] = value;
+        return true;
+    }
+
+    public static bool Remove(Person person, string targetId)
+    {
+        if (person.Opinions is not IDictionary<string, int> dict)
+        {
+            throw new InvalidOperationException($"Cannot mutate opinions for {person.Id}.");
+        }
+
+        if (dict.IsReadOnly)
+        {
+            throw new InvalidOperationException($"Cannot mutate opinions for {person.Id}.");
+        }
+
+        return dict.Remove(targetId);
+    }
+
+    public static int FamilyBasis(Roster roster, BehaviorDef rules, Person from, Person to)
+    {
+        var family = roster.Families.FirstOrDefault(candidate =>
+            candidate.Id.Equals(from.FamilyId, StringComparison.Ordinal)
+            && candidate.Id.Equals(to.FamilyId, StringComparison.Ordinal));
+        if (family is null)
+        {
+            return 0;
+        }
+
+        var fromParent = InFamily(family.ParentIds, from.Id);
+        var toParent = InFamily(family.ParentIds, to.Id);
+        var fromChild = InFamily(family.ChildIds, from.Id);
+        var toChild = InFamily(family.ChildIds, to.Id);
+
+        if (fromParent && toChild)
+        {
+            return rules.OpinionParentToChildStart;
+        }
+
+        if (fromChild && toParent)
+        {
+            return rules.OpinionChildToParentStart;
+        }
+
+        if (fromChild && toChild && !from.Id.Equals(to.Id, StringComparison.Ordinal))
+        {
+            return rules.OpinionSiblingStart;
+        }
+
+        if (fromParent && toParent && !from.Id.Equals(to.Id, StringComparison.Ordinal))
+        {
+            return rules.OpinionPartnerStart;
+        }
+
+        return 0;
+    }
+
+    public static int MoveToward(int current, int target, int step)
+    {
+        if (current == target)
+        {
+            return current;
+        }
+
+        if (current < target)
+        {
+            return Math.Min(current + step, target);
+        }
+
+        return Math.Max(current - step, target);
+    }
+
+    public static HashSet<string> FamilyMemberIds(Roster roster, Person person)
+    {
+        var family = roster.Families.FirstOrDefault(candidate =>
+            candidate.Id.Equals(person.FamilyId, StringComparison.Ordinal));
+        if (family is null)
+        {
+            return [];
+        }
+
+        var ids = new HashSet<string>(StringComparer.Ordinal);
+        foreach (var id in family.ParentIds)
+        {
+            if (!id.Equals(person.Id, StringComparison.Ordinal))
+            {
+                ids.Add(id);
+            }
+        }
+
+        foreach (var id in family.ChildIds)
+        {
+            if (!id.Equals(person.Id, StringComparison.Ordinal))
+            {
+                ids.Add(id);
+            }
+        }
+
+        return ids;
+    }
+
+    private static bool InFamily(IReadOnlyList<string> ids, string id)
+    {
+        foreach (var candidate in ids)
+        {
+            if (candidate.Equals(id, StringComparison.Ordinal))
+            {
+                return true;
+            }
+        }
+
+        return false;
+    }
+}

src/HSchool.People/Roster.cs

@@ -52,6 +52,9 @@ public sealed record Person
     /// <summary>Changing-room node when this pupil won a locker slot. Null for staff and the rest.</summary>
     public string? LockerRoomId { get; init; }
 
+    /// <summary>What this person thinks of others, A→B. Sparse; zero is not stored.</summary>
+    public IReadOnlyDictionary<string, int> Opinions { get; init; } = new Dictionary<string, int>(StringComparer.Ordinal);
+
     public int AgeOn(DateTime asOf) => SchoolYears.AgeYears(BirthDate, asOf);
 }
 

src/HSchool.People/RosterGenerator.cs

@@ -44,7 +44,8 @@ public static class RosterGenerator
         }
 
         var classes = FillClasses(demand.Classes, people);
-        return LockerAssigner.Apply(catalog, map, new Roster(people, families, classes));
+        var roster = LockerAssigner.Apply(catalog, map, new Roster(people, families, classes));
+        return OpinionGenerator.SeedFamily(catalog, roster);
     }
 
     /// <summary>