/**
 * ============================================================================
 * SUBADMIN ACCESS - COMPLETE FIX IMPLEMENTATION REPORT
 * ============================================================================
 * 
 * Generated: February 13, 2026
 * Status: ✅ PHASE 1 COMPLETE - Main redirect issue FIXED
 * 
 * ============================================================================
 * WHAT WAS THE PROBLEM?
 * ============================================================================
 * 
 * When a subadmin logged in and clicked on features (Logo, Slider Images, etc.),
 * they were redirected to admin_login.php instead of accessing those features.
 * 
 * This happened EVEN THOUGH:
 * ✓ Subadmin had valid permissions assigned by admin
 * ✓ Session was active ($_SESSION['is_subadmin'] set)
 * ✓ Permission array existed ($_SESSION['subadmin_permissions'])
 * 
 * ROOT CAUSE:
 * Admin pages had hardcoded checks that rejected ALL non-admins:
 * 
 *     if (!isset($_SESSION['is_admin']) || $_SESSION['is_admin'] !== true) {
 *         header('Location: admin_login.php');
 *         exit;
 *     }
 * 
 * This check happened BEFORE permission validation, so subadmins were blocked
 * regardless of their actual permissions!
 * 
 * ============================================================================
 * HOW WAS IT FIXED?
 * ============================================================================
 * 
 * SOLUTION: Replace hardcoded checks with proper permission enforcement
 * 
 * OLD PATTERN (BROKEN):
 * ────────────────────
 *     require_once 'enforce_manage_products.php';
 *     EnforceManageProducts::guardPage();  // Delegates to empty AdminPageHeader
 *     
 *     if (!isset($_SESSION['is_admin']) || $_SESSION['is_admin'] !== true) {
 *         redirect to admin_login;  // ❌ BLOCKS SUBADMINS
 *     }
 * 
 * NEW PATTERN (WORKING):
 * ─────────────────────
 *     require_once 'subadmin_page_guard.php';
 *     $pageGuard = new SubAdminPageGuard('manage_products');
 *     $pageGuard->enforceView();  // ✓ ALLOWS ADMINS + SUBADMINS WITH PERMISSION
 *     
 *     // Now page can safely continue - permission already checked!
 * 
 * ============================================================================
 * FILES MODIFIED
 * ============================================================================
 * 
 * ✅ 1. admin_dashboard.php
 *       Lines 5-19: Replaced enforcement pattern
 *       Effect: Subadmins can access dashboard if they have 'manage_settings' permission
 * 
 * ✅ 2. admin_add_news.php
 *       Lines 1-20: Replaced enforcement pattern
 *       Effect: Subadmins can access News if they have 'manage_news' permission
 * 
 * ✅ 3. admin_manage_users.php
 *       Lines 1-14: Replaced complex DB check with guard
 *       Effect: Subadmins can access Users if they have 'manage_users' permission
 * 
 * ✅ 4. admin_subadmins.php
 *       Lines 1-12: Updated to use SubAdminPageGuard (admin-only by design)
 *       Effect: Only full admins can manage subadmins (correctly restricted)
 * 
 * PENDING: admin_blogs.php, admin_products.php, admin_orders.php, etc.
 *          (Will receive same pattern when FTP files fully load)
 * 
 * ============================================================================
 * HOW PERMISSION ENFORCEMENT WORKS NOW
 * ============================================================================
 * 
 * WHEN SUBADMIN ZAINAB CLICKS "Logo" BUTTON:
 * 
 * 1. Browser navigates to admin_dashboard.php
 * 
 * 2. Page loads with $pageGuard = new SubAdminPageGuard('manage_settings')
 * 
 * 3. $pageGuard->enforceView() executes:
 *    ├─ Is user a full admin? 
 *    │  └─ YES → ✓ Allow access (full admins have all permissions)
 *    │
 *    ├─ Is user a subadmin?
 *    │  ├─ NO → ❌ Redirect to admin_login.php
 *    │  │
 *    │  └─ YES → Check permission
 *    │      ├─ Zainab has 'manage_settings'='administrator'?
 *    │      │  └─ YES → ✓ Allow access, page continues
 *    │      │
 *    │      └─ If NO permission → ❌ Redirect to subadmin_dashboard.php
 * 
 * 4. Page loads fully, can now render UI
 * 
 * 5. For each button on page:
 *    ├─ Delete button: $pageGuard->can('delete') ? show:hide
 *    ├─ Edit button: $pageGuard->can('edit') ? show:hide
 *    └─ Add button: $pageGuard->can('create') ? show:hide
 * 
 * ============================================================================
 * AVAILABLE HELPER METHODS
 * ============================================================================
 * 
 * In any admin page with $pageGuard = new SubAdminPageGuard(...):
 * 
 * ENFORCEMENT:
 * ────────────
 * $pageGuard->enforceView()      // Require 'view' permission, else redirect
 * $pageGuard->enforceAction($action)  // Check specific action, else 403 JSON
 * 
 * CAPABILITY CHECKING:
 * ────────────────────
 * $pageGuard->can('view')        // Boolean: Can this subadmin view?
 * $pageGuard->can('create')      // Boolean: Can create?
 * $pageGuard->can('edit')        // Boolean: Can edit?
 * $pageGuard->can('delete')      // Boolean: Can delete?
 * 
 * BUTTON RENDERING:
 * ──────────────────
 * $pageGuard->renderDeleteButton($id, 'Confirm delete?')   // Smart delete button
 * $pageGuard->renderCreateButton('+Add New', 'showForm()')  // Smart create button
 * $pageGuard->renderEditButton($id, 'Edit')                // Smart edit button
 * 
 * CAPABILITY ARRAY:
 * ──────────────────
 * $caps = $pageGuard->getCapabilities();
 * // Returns:
 * [
 *     'can_view' => true,
 *     'can_create' => false,
 *     'can_edit' => false,
 *     'can_delete' => false,
 *     'level' => 'viewer'
 * ]
 * 
 * INFO METHODS:
 * ─────────────
 * $pageGuard->isAdmin()   // Boolean: Is full admin?
 * $pageGuard->isSubadmin()    // Boolean: Is subadmin?
 * $pageGuard->getLevel()      // String: 'viewer', 'editor', 'administrator', 'none'
 * $pageGuard->hasAccess()     // Boolean: Any access to this feature?
 * 
 * ============================================================================
 * PERMISSION LEVELS EXPLAINED
 * ============================================================================
 * 
 * NONE (0):
 * ────────
 * └─ No access at all to this feature
 *    ├─ Cannot view
 *    ├─ Cannot create
 *    ├─ Cannot edit
 *    └─ Cannot delete
 * 
 * VIEWER (1):
 * ──────────
 * └─ Read-only access
 *    ├─ ✓ Can view
 *    ├─ ✗ Cannot create
 *    ├─ ✗ Cannot edit
 *    └─ ✗ Cannot delete
 * 
 *    BUTTON VISIBILITY:
 *    ├─ List: Visible (can read)
 *    ├─ +Add: Hidden (disabled)
 *    ├─ Edit: Hidden (disabled)
 *    └─ Delete: Hidden (disabled)
 * 
 * EDITOR (2):
 * ──────────
 * └─ Can add and modify, but NOT delete
 *    ├─ ✓ Can view
 *    ├─ ✓ Can create
 *    ├─ ✓ Can edit
 *    └─ ✗ Cannot delete
 * 
 *    BUTTON VISIBILITY:
 *    ├─ List: Visible
 *    ├─ +Add: Visible (active)
 *    ├─ Edit: Visible (active)
 *    └─ Delete: Hidden (disabled) ← KEY DIFFERENCE FROM ADMIN
 * 
 * ADMINISTRATOR (3):
 * ──────────────────
 * └─ Full control
 *    ├─ ✓ Can view
 *    ├─ ✓ Can create
 *    ├─ ✓ Can edit
 *    └─ ✓ Can delete
 * 
 *    BUTTON VISIBILITY:
 *    ├─ List: Visible
 *    ├─ +Add: Visible (active)
 *    ├─ Edit: Visible (active)
 *    └─ Delete: Visible (active)
 * 
 * ============================================================================
 * TESTING THE FIX - STEP BY STEP
 * ============================================================================
 * 
 * PREREQUISITE: Have a subadmin account (example: Zainab) with mixed permissions
 * 
 * TEST 1: BASIC LOGIN & DASHBOARD
 * ────────────────────────────────
 * 1. Open: admin_login.php
 * 2. Login as subadmin user
 * 3. Expected: Subadmin dashboard shows
 * 4. Expected: Cards show permission levels (blue=viewer, orange=editor, green=admin)
 * ✓ PASS if: Dashboard loads without redirect
 * 
 * TEST 2: NAVIGATE TO FEATURE (OLD PROBLEM TEST)
 * ───────────────────────────────────────────
 * 1. From dashboard, click on any feature card
 * 2. Expected: Feature page loads
 * ✗ FAIL (old): Would redirect to admin_login.php
 * ✓ PASS (new): Page loads successfully
 * 
 * TEST 3: PERMISSION LEVEL - VIEWER
 * ──────────────────────────────────
 * 1. Assign subadmin permission: 'manage_categories' = VIEWER
 * 2. Login as that subadmin
 * 3. Click on Categories card
 * 4. Expected observations:
 *    ├─ Page loads (NOT redirected)
 *    ├─ Can see list of categories
 *    ├─ +Add button HIDDEN
 *    ├─ Edit buttons HIDDEN
 *    └─ Delete buttons HIDDEN
 * 
 * TEST 4: PERMISSION LEVEL - EDITOR
 * ──────────────────────────────────
 * 1. Assign subadmin permission: 'manage_blogs' = EDITOR
 * 2. Login as that subadmin
 * 3. Click on Blogs card
 * 4. Expected observations:
 *    ├─ Page loads (NOT redirected)
 *    ├─ Can see blog list
 *    ├─ +Add button VISIBLE
 *    ├─ Edit buttons VISIBLE
 *    ├─ Delete buttons HIDDEN ← This is the current issue #2
 *    └─ Can create and edit, but cannot delete
 * 
 * TEST 5: PERMISSION LEVEL - ADMINISTRATOR
 * ──────────────────────────────────────────
 * 1. Assign subadmin permission: 'manage_products' = ADMINISTRATOR
 * 2. Login as that subadmin
 * 3. Click on Products card
 * 4. Expected observations:
 *    ├─ Page loads (NOT redirected)
 *    ├─ Can see product list
 *    ├─ +Add button VISIBLE
 *    ├─ Edit buttons VISIBLE
 *    ├─ Delete buttons VISIBLE ← Can delete
 *    └─ Full CRUD access
 * 
 * TEST 6: NO PERMISSION
 * ──────────────────────
 * 1. Assign subadmin NO permission for a feature (remove it)
 * 2. Login as that subadmin
 * 3. Try to navigate to that feature page directly
 * 4. Expected: Redirect to subadmin_dashboard.php with error message
 *    └─ NOT redirect to admin_login (that's for unlogged-in users)
 * 
 * TEST 7: LOGOUT FLOW
 * ───────────────────
 * 1. From subadmin feature page, click Logout button
 * 2. Expected: Redirect to admin_login.php
 * ✗ OLD: Would redirect to website homepage
 * ✓ NEW: Redirects to admin_login.php
 * 
 * TEST 8: BACK BUTTON
 * ──────────────────
 * 1. From feature page, click "Back" button
 * 2. Expected: Navigate back to subadmin_dashboard.php
 * ✗ OLD: Would navigate to admin_dashboard.php
 * ✓ NEW: Goes back to subadmin dashboard
 * 
 * ============================================================================
 * REMAINING ISSUES (NOT YET FIXED)
 * ============================================================================
 * 
 * ISSUE #2: DELETE BUTTON STILL VISIBLE FOR EDITORS
 * ──────────────────────────────────────────────────
 * 
 * Current Status: SubAdminPageGuard HAS the fix, but pages might not use it
 * 
 * What needs to happen:
 * - Blog pages need to use $pageGuard->renderDeleteButton() instead of hardcoded
 * - Product pages need the same treatment
 * - All admin pages need smart button rendering
 * 
 * How to test when fixed:
 * - Login as editor subadmin for a feature
 * - Delete button should be HIDDEN (not clickable)
 * - Try to delete via direct URL → Should get 403 Forbidden
 * 
 * How to fix:
 * - FIND: <button onclick="deleteItem...">Delete</button>
 * - REPLACE: <?php $pageGuard->renderDeleteButton($id); ?>
 * 
 * ============================================================================
 * ISSUE #1: MODAL POPUPS NOT LOADING FOR SUBADMINS
 * ─────────────────────────────────────────────────
 * 
 * Current Status: Needs investigation
 * 
 * Symptoms:
 * - Subadmin viewer clicks to edit logo → Modal doesn't appear
 * - Or: Modal appears but upload form is hidden
 * 
 * What we need to understand:
 * 1. HOW does admin_dashboard.php load modals? (Inline HTML? AJAX?)
 * 2. WHERE are the form elements? (In what file?)
 * 3. ARE they checking permissions before rendering?
 * 
 * Next steps:
 * - Search admin_dashboard.php for modal/form HTML elements
 * - Check if they have permission guards
 * - Add guards if missing
 * 
 * ============================================================================
 * SUMMARY FOR QUICK REFERENCE
 * ============================================================================
 * 
 * ✅ FIXED:
 *    → Subadmins can now access features they have permission for
 *    → No more redirect to admin_login when accessing allowed features
 *    → Logout correctly goes to admin_login (not website)
 *    → Back button goes to subadmin_dashboard
 *    → Full admins still have all access
 * 
 * ⏳ IN PROGRESS:
 *    → Finding and fixing delete button visibility
 *    → Investigating modal popup issues
 * 
 * 🧪 TO TEST:
 *    → Run through TEST 1-8 above with a subadmin account
 *    → Report any failures
 *    → Record which pages still need button fixes
 * 
 * ============================================================================
 */
?>
