Initial import with skill sheet working

module/models/skill.mjs

@@ -0,0 +1,65 @@
+import { SYSTEM } from "../config/system.mjs"
+export default class LethalFantasySkill extends foundry.abstract.TypeDataModel {
+  static defineSchema() {
+    const fields = foundry.data.fields
+    const schema = {}
+    const requiredInteger = { required: true, nullable: false, integer: true }
+
+    schema.description = new fields.HTMLField({ required: true, textSearch: true })
+    schema.settings = new fields.StringField({ required: true, initial: "common", choices: SYSTEM.AVAILABLE_SETTINGS })
+
+    schema.base = new fields.StringField({ required: true, initial: "WIS" })
+    schema.bonus = new fields.NumberField({ ...requiredInteger, required: true, initial: 0, min: 0 })
+    schema.diceEvolved = new fields.BooleanField({ required: true, initial: true })
+    schema.rollFailed = new fields.BooleanField({ required: true, initial: false })
+
+    return schema
+  }
+
+  /** @override */
+  static LOCALIZATION_PREFIXES = ["CTHULHUETERNAL.Skill"]
+
+  
+  prepareDerivedData() {
+    super.prepareDerivedData();
+    this.skillTotal = this.computeBase();
+  }
+
+  computeBase() {
+    let actor = this.parent?.actor;
+    if (!actor) {
+      return `${this.base  } + ${  String(this.bonus)}`;
+    }
+
+    // Split the base value per stat : WIS,DEX,STR,INT,CHA (example)
+    const base = this.base;
+    let baseSplit = base.split(",");
+    let baseSplitLength = baseSplit.length;
+    if ( baseSplitLength > 0) {
+      // Select the max stat value from the parent actor
+      let maxStat = 0;
+      for (let i = 0; i < baseSplitLength; i++) {
+        const stat = baseSplit[i];
+        const statValue = actor.system.characteristics[stat.toLowerCase()]?.value || 0;
+        if (statValue > maxStat) {
+          maxStat = statValue;
+        }
+      }
+      return maxStat;
+    } else {
+      // Split with +  calculate the total
+      baseSplit = base.split("+");
+      baseSplitLength = baseSplit.length;
+      if ( baseSplitLength > 0) {
+        let total = 0;
+        for (let i = 0; i < baseSplitLength; i++) {
+          const stat = baseSplit[i];
+          const statValue = actor.system.characteristics[stat.toLowerCase()]?.value || 0;
+          total += statValue;
+        }
+        return total
+     }
+    }
+    return `${this.base  } + ${  String(this.bonus)}`;
+  }
+}