Initial commit: Theriapolis baseline at port/godot branch point

Captures the pre-Godot-port state of the codebase. This is the rollback anchor for the Godot port (M0 of theriapolis-rpg-implementation-plan-godot-port.md). All Phase 0 through Phase 6.5 work is included; Phase 7 is in flight. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-04-30 20:40:51 -07:00
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+namespace Theriapolis.Core.Rules.Stats;
+
+/// <summary>
+/// Standard d20-adjacent skill list. Each skill is backed by a single
+/// ability — see <see cref="SkillAbility"/>.
+/// </summary>
+public enum SkillId : byte
+{
+    Acrobatics      = 0,
+    AnimalHandling  = 1,
+    Arcana          = 2,    // Theriapolis: "Advanced Engineering"
+    Athletics       = 3,
+    Deception       = 4,
+    History         = 5,
+    Insight         = 6,
+    Intimidation    = 7,
+    Investigation   = 8,
+    Medicine        = 9,
+    Nature          = 10,
+    Perception      = 11,
+    Performance     = 12,
+    Persuasion      = 13,
+    Religion        = 14,   // Theriapolis: Covenant lore
+    SleightOfHand   = 15,
+    Stealth         = 16,
+    Survival        = 17,
+}
+
+public static class SkillIdExtensions
+{
+    public static AbilityId Ability(this SkillId s) => s switch
+    {
+        SkillId.Acrobatics      => AbilityId.DEX,
+        SkillId.AnimalHandling  => AbilityId.WIS,
+        SkillId.Arcana          => AbilityId.INT,
+        SkillId.Athletics       => AbilityId.STR,
+        SkillId.Deception       => AbilityId.CHA,
+        SkillId.History         => AbilityId.INT,
+        SkillId.Insight         => AbilityId.WIS,
+        SkillId.Intimidation    => AbilityId.CHA,
+        SkillId.Investigation   => AbilityId.INT,
+        SkillId.Medicine        => AbilityId.WIS,
+        SkillId.Nature          => AbilityId.INT,
+        SkillId.Perception      => AbilityId.WIS,
+        SkillId.Performance     => AbilityId.CHA,
+        SkillId.Persuasion      => AbilityId.CHA,
+        SkillId.Religion        => AbilityId.INT,
+        SkillId.SleightOfHand   => AbilityId.DEX,
+        SkillId.Stealth         => AbilityId.DEX,
+        SkillId.Survival        => AbilityId.WIS,
+        _ => throw new ArgumentOutOfRangeException(nameof(s)),
+    };
+
+    /// <summary>Parses a snake_case JSON value (e.g. "animal_handling") into a SkillId.</summary>
+    public static SkillId FromJson(string raw) => raw.ToLowerInvariant() switch
+    {
+        "acrobatics"        => SkillId.Acrobatics,
+        "animal_handling"   => SkillId.AnimalHandling,
+        "arcana"            => SkillId.Arcana,
+        "athletics"         => SkillId.Athletics,
+        "deception"         => SkillId.Deception,
+        "history"           => SkillId.History,
+        "insight"           => SkillId.Insight,
+        "intimidation"      => SkillId.Intimidation,
+        "investigation"     => SkillId.Investigation,
+        "medicine"          => SkillId.Medicine,
+        "nature"            => SkillId.Nature,
+        "perception"        => SkillId.Perception,
+        "performance"       => SkillId.Performance,
+        "persuasion"        => SkillId.Persuasion,
+        "religion"          => SkillId.Religion,
+        "sleight_of_hand"   => SkillId.SleightOfHand,
+        "stealth"           => SkillId.Stealth,
+        "survival"          => SkillId.Survival,
+        _ => throw new ArgumentException($"Unknown skill: '{raw}'"),
+    };
+}