Profile System & Mod Loading Fixes

Added a full profile system and fixed a few critical mod loading issues.

What changed

Profiles — Implemented proper profile management (create, switch, delete). Each profile now has its own isolated mod list.

Mod Isolation — Fixed ModManager so mods are strictly scoped to the active profile. Browsing and installing only affects the selected profile.

Critical Fix — Fixed a path bug where mods were being saved to ~/AppData/Local on macOS (Windows path) instead of ~/Library/Application Support. Mods now save to the correct location and load correctly in-game.

Stability — Added an auto-sync step before every launch to make sure the physical mods folder always matches the active profile.

UI — Added a profile selector dropdown and a profile management modal.

backend/managers/profileManager.js

@@ -0,0 +1,209 @@
+const path = require('path');
+const fs = require('fs');
+const { v4: uuidv4 } = require('uuid');
+const { 
+  loadConfig, 
+  saveConfig, 
+  getModsPath 
+} = require('../core/config');
+
+// We'll lazy-load modManager to avoid circular dependencies if possible, 
+// or carefully structure our imports. 
+// For now, we might need to access mod paths directly or use helper functions.
+
+class ProfileManager {
+  constructor() {
+    this.initialized = false;
+  }
+
+  init() {
+    if (this.initialized) return;
+
+    const config = loadConfig();
+    
+    // Migration: specific check to see if we have profiles yet
+    if (!config.profiles || Object.keys(config.profiles).length === 0) {
+      this.migrateLegacyConfig(config);
+    }
+    
+    this.initialized = true;
+    console.log('[ProfileManager] Initialized');
+  }
+
+  migrateLegacyConfig(config) {
+    console.log('[ProfileManager] Migrating legacy config to profile system...');
+    
+    // Create a default profile with current settings
+    const defaultProfileId = 'default';
+    const defaultProfile = {
+      id: defaultProfileId,
+      name: 'Default',
+      created: new Date().toISOString(),
+      lastUsed: new Date().toISOString(),
+      
+      // settings specific to this profile
+      // If global settings existed, we copy them here
+      mods: config.installedMods || [], // Legacy mods are now part of default profile
+      javaPath: config.javaPath || '',
+      gameOptions: {
+        minMemory: '1G',
+        maxMemory: '4G',
+        args: []
+      }
+    };
+
+    const updates = {
+      profiles: {
+        [defaultProfileId]: defaultProfile
+      },
+      activeProfileId: defaultProfileId,
+      // We keep a global registry of "known" mods if we want, 
+      // but for now the current implementation implies 
+      // mods are just files in folders.
+      // We'll use the profile "mods" array to track ENABLED/KNOWN mods for that profile.
+    };
+
+    saveConfig(updates);
+    console.log('[ProfileManager] Migration complete. Created Default profile.');
+  }
+
+  createProfile(name) {
+    if (!name || typeof name !== 'string') {
+      throw new Error('Invalid profile name');
+    }
+
+    const config = loadConfig();
+    const id = uuidv4();
+    
+    const newProfile = {
+      id,
+      name: name.trim(),
+      created: new Date().toISOString(),
+      lastUsed: null,
+      mods: [], // Start with no mods enabled
+      javaPath: '', 
+      gameOptions: {
+        minMemory: '1G',
+        maxMemory: '4G',
+        args: []
+      }
+    };
+
+    const profiles = config.profiles || {};
+    profiles[id] = newProfile;
+
+    saveConfig({ profiles });
+    
+    console.log(`[ProfileManager] Created new profile: "${name}" (${id})`);
+    return newProfile;
+  }
+
+  getProfiles() {
+    const config = loadConfig();
+    return Object.values(config.profiles || {});
+  }
+
+  getProfile(id) {
+    const config = loadConfig();
+    return (config.profiles && config.profiles[id]) || null;
+  }
+
+  getActiveProfile() {
+    const config = loadConfig();
+    const activeId = config.activeProfileId;
+    if (!activeId || !config.profiles || !config.profiles[activeId]) {
+      // Fallback if something is corrupted
+      return this.getProfiles()[0] || null; 
+    }
+    return config.profiles[activeId];
+  }
+
+  async activateProfile(id) {
+    const config = loadConfig();
+    if (!config.profiles || !config.profiles[id]) {
+        throw new Error(`Profile not found: ${id}`);
+    }
+
+    if (config.activeProfileId === id) {
+        console.log(`[ProfileManager] Profile ${id} is already active.`);
+        return config.profiles[id];
+    }
+
+    console.log(`[ProfileManager] Switching to profile: ${config.profiles[id].name} (${id})`);
+    
+    // 1. Update config first
+    config.profiles[id].lastUsed = new Date().toISOString();
+    saveConfig({ 
+        activeProfileId: id,
+        profiles: config.profiles 
+    });
+
+    // 2. Trigger Mod Sync
+    // We need to require this here to ensure it uses the *newly saved* active profile ID
+    const { syncModsForCurrentProfile } = require('./modManager');
+    await syncModsForCurrentProfile();
+
+    return config.profiles[id];
+  }
+
+  deleteProfile(id) {
+    const config = loadConfig();
+    const profiles = config.profiles || {};
+    
+    if (!profiles[id]) {
+      throw new Error('Profile not found');
+    }
+
+    if (config.activeProfileId === id) {
+       throw new Error('Cannot delete the active profile');
+    }
+
+    // Don't allow deleting the last profile
+    if (Object.keys(profiles).length <= 1) {
+        throw new Error('Cannot delete the only remaining profile');
+    }
+
+    delete profiles[id];
+    saveConfig({ profiles });
+    console.log(`[ProfileManager] Deleted profile: ${id}`);
+    
+    return true;
+  }
+
+  updateProfile(id, updates) {
+    const config = loadConfig();
+    const profiles = config.profiles || {};
+    
+    if (!profiles[id]) {
+        throw new Error('Profile not found');
+    }
+
+    // Safety checks on updates
+    const allowedFields = ['name', 'javaPath', 'gameOptions', 'mods'];
+    const sanitizedUpdates = {};
+    
+    Object.keys(updates).forEach(key => {
+        if (allowedFields.includes(key)) {
+            sanitizedUpdates[key] = updates[key];
+        }
+    });
+
+    profiles[id] = { ...profiles[id], ...sanitizedUpdates };
+    
+    saveConfig({ profiles });
+    console.log(`[ProfileManager] Updated profile: ${id}`);
+    
+    // If we updated mods for the *active* profile, we might need to sync immediately
+    if (config.activeProfileId === id && updates.mods) {
+         // Optionally trigger sync? 
+         // Usually updates come from "Enabling/Disabling" a single mod, 
+         // which might call a more specific method. 
+         // But if we bulk update, we should sync.
+         // Let's leave sync invoke to the caller or specific methods for now.
+    }
+
+    return profiles[id];
+  }
+}
+
+module.exports = new ProfileManager();