aether-shards/src/units/Explorer.js

import { Unit } from "./Unit.js";

/**
 * Explorer.js
 * Player character class supporting Multi-Class Mastery and Persistent Progression.
 */
export class Explorer extends Unit {
  constructor(id, name, startingClassId, classDefinition) {
    super(id, name, "EXPLORER", `${startingClassId}_MODEL`);

    this.activeClassId = startingClassId;

    // Persistent Mastery: Tracks progress for EVERY class this character has played
    // Key: ClassID, Value: { level, xp, skillPoints, unlockedNodes[] }
    this.classMastery = {};

    // Initialize the starting class entry
    this.initializeMastery(startingClassId);

    // Hydrate stats based on the provided definition
    if (classDefinition) {
      this.recalculateBaseStats(classDefinition);
      this.currentHealth = this.baseStats.health;
    }

    // Inventory
    this.equipment = {
      weapon: null,
      armor: null,
      utility: null,
      relic: null,
    };

    // Active Skills (Populated by Skill Tree)
    this.actions = [];
    this.passives = [];
  }

  initializeMastery(classId) {
    if (!this.classMastery[classId]) {
      this.classMastery[classId] = {
        level: 1,
        xp: 0,
        skillPoints: 0,
        unlockedNodes: [],
      };
    }
  }

  /**
   * Updates base stats based on the active class's base + growth rates * level.
   * @param {Object} classDef - The JSON definition of the class stats.
   */
  recalculateBaseStats(classDef) {
    if (classDef.id !== this.activeClassId) {
      console.warn(
        `Mismatch: Recalculating stats for ${this.activeClassId} using definition for ${classDef.id}`
      );
    }

    const mastery = this.classMastery[this.activeClassId];

    // 1. Start with Class Defaults
    let stats = { ...classDef.base_stats };

    // 2. Add Level Growth
    // (Level 1 is base, so growth applies for levels 2+)
    const levelsGained = mastery.level - 1;
    if (levelsGained > 0) {
      for (let stat in classDef.growth_rates) {
        if (stats[stat] !== undefined) {
          stats[stat] += classDef.growth_rates[stat] * levelsGained;
        }
      }
    }

    this.baseStats = stats;
    this.maxHealth = stats.health; // Update MaxHP cap
  }

  /**
   * Swaps the active class logic.
   * NOTE: Does NOT check unlock requirements (handled by UI/MetaSystem).
   */
  changeClass(newClassId, newClassDef) {
    // 1. Ensure mastery record exists
    this.initializeMastery(newClassId);

    // 2. Switch ID
    this.activeClassId = newClassId;

    // 3. Update Model ID (Visuals)
    this.voxelModelID = `${newClassId}_MODEL`;

    // 4. Recalculate Stats for the new job
    this.recalculateBaseStats(newClassDef);

    // 5. Reset Current HP to new Max (or keep percentage? Standard is reset)
    this.currentHealth = this.baseStats.health;
  }

  /**
   * Adds XP to the *current* class.
   */
  gainExperience(amount) {
    const mastery = this.classMastery[this.activeClassId];
    mastery.xp += amount;
    // Level up logic would be handled by a system checking XP curves
  }

  getLevel() {
    return this.classMastery[this.activeClassId].level;
  }
}