<?php
/**
 * MSPE Portfolio API
 */

require_once 'config.php';

$method = $_SERVER['REQUEST_METHOD'];
$id = $_GET['id'] ?? null;

// CSRF protection for write operations
if ($method !== 'GET') {
    requireSameOriginRequest();
}

switch ($method) {
    case 'GET':
        if ($id) {
            getProject($id);
        } else {
            getProjects();
        }
        break;
        
    case 'POST':
        requireAuth();
        if (!empty($_POST['id'])) {
            updateProject($_POST['id']);
        } else {
            createProject();
        }
        break;
        
    case 'PUT':
        requireAuth();
        if (!$id) {
            jsonResponse(['success' => false, 'message' => 'Project ID required'], 400);
        }
        updateProject($id);
        break;
        
    case 'DELETE':
        requireAuth();
        if (!$id) {
            jsonResponse(['success' => false, 'message' => 'Project ID required'], 400);
        }
        deleteProject($id);
        break;
        
    default:
        jsonResponse(['success' => false, 'message' => 'Method not allowed'], 405);
}

function getProjects() {
    global $db;
    
    $projects = $db->getAll('portfolio');
    
    // Apply filters
    $category = $_GET['category'] ?? null;
    $featured = $_GET['featured'] ?? null;
    $limit = (int)($_GET['limit'] ?? 20);
    $offset = (int)($_GET['offset'] ?? 0);
    
    if ($category) {
        $projects = array_filter($projects, function($p) use ($category) {
            return $p['category'] === $category;
        });
    }
    
    if ($featured !== null) {
        $projects = array_filter($projects, function($p) use ($featured) {
            return ($p['featured'] ?? false) == ($featured === 'true' || $featured === '1');
        });
    }
    
    // Public view: only published/active projects
    if (!checkAuth()) {
        $projects = array_filter($projects, function($p) {
            return ($p['status'] ?? 'published') === 'published';
        });
    }
    
    // Sort by order or date
    usort($projects, function($a, $b) {
        $orderA = $a['order'] ?? 999;
        $orderB = $b['order'] ?? 999;
        if ($orderA !== $orderB) {
            return $orderA - $orderB;
        }
        return strtotime($b['created_at']) - strtotime($a['created_at']);
    });
    
    $total = count($projects);
    $projects = array_slice(array_values($projects), $offset, $limit);
    
    jsonResponse([
        'success' => true,
        'data' => $projects,
        'total' => $total,
        'limit' => $limit,
        'offset' => $offset
    ]);
}

function getProject($id) {
    global $db;
    
    $project = $db->get('portfolio', $id);
    
    if (!$project) {
        jsonResponse(['success' => false, 'message' => 'Project not found'], 404);
    }
    
    jsonResponse([
        'success' => true,
        'data' => $project
    ]);
}

function createProject() {
    global $db;
    
    // Handle multipart form data or JSON
    if (!empty($_FILES)) {
        $data = $_POST;
    } else {
        $data = getRequestBody();
    }
    
    // Validate required fields
    if (empty($data['title'])) {
        jsonResponse(['success' => false, 'message' => 'Title is required'], 400);
    }
    
    // Sanitize text fields (allow HTML in description)
    $data['title'] = sanitize($data['title']);
    $data['category'] = sanitize($data['category'] ?? '');
    $data['client'] = sanitize($data['client'] ?? '');
    $data['technologies'] = sanitize($data['technologies'] ?? '');
    // Sanitize description: allow only safe formatting tags
    $data['description'] = sanitizeRichText($data['description'] ?? '');
    
    // Handle image upload
    if (!empty($_FILES['image'])) {
        $upload = handleFileUpload($_FILES['image'], 'portfolio');
        if ($upload['success']) {
            $data['image'] = $upload['path'];
        }
    }

    // Parse results JSON (JS sends as a serialised string)
    $data['results'] = json_decode($data['results'] ?? '[]', true) ?? [];

    // Gallery: merge existing-keep list + newly uploaded files
    $gallery = json_decode($_POST['gallery_keep'] ?? '[]', true) ?? [];
    if (!empty($_FILES['gallery_images']['tmp_name'])) {
        foreach ($_FILES['gallery_images']['tmp_name'] as $key => $tmpName) {
            if ($_FILES['gallery_images']['error'][$key] !== UPLOAD_ERR_OK) continue;
            $file = [
                'name'     => $_FILES['gallery_images']['name'][$key],
                'type'     => $_FILES['gallery_images']['type'][$key],
                'tmp_name' => $tmpName,
                'error'    => $_FILES['gallery_images']['error'][$key],
                'size'     => $_FILES['gallery_images']['size'][$key],
            ];
            $upload = handleFileUpload($file, 'portfolio');
            if ($upload['success']) {
                $gallery[] = $upload['path'];
            }
        }
    }
    $data['gallery'] = $gallery;

    // Set defaults
    $data['featured'] = $data['featured'] ?? false;
    $data['order'] = (int)($data['order'] ?? 0);
    $data['status'] = $data['status'] ?? 'published';
    
    $project = $db->insert('portfolio', $data);
    
    jsonResponse([
        'success' => true,
        'message' => 'Project created successfully',
        'data' => $project
    ], 201);
}

function updateProject($id) {
    global $db;
    
    $existing = $db->get('portfolio', $id);
    if (!$existing) {
        jsonResponse(['success' => false, 'message' => 'Project not found'], 404);
    }
    
    // Handle multipart form data or JSON
    if (!empty($_FILES)) {
        $data = $_POST;
    } else {
        $data = getRequestBody();
    }
    
    // Handle image upload
    if (!empty($_FILES['image'])) {
        $upload = handleFileUpload($_FILES['image'], 'portfolio');
        if ($upload['success']) {
            $data['image'] = $upload['path'];
        }
    }

    // Sanitize editable text fields
    if (isset($data['title'])) $data['title'] = sanitize($data['title']);
    if (isset($data['category'])) $data['category'] = sanitize($data['category']);
    if (isset($data['client'])) $data['client'] = sanitize($data['client']);
    if (isset($data['technologies'])) $data['technologies'] = sanitize($data['technologies']);
    if (isset($data['description'])) $data['description'] = sanitizeRichText($data['description']);

    // Parse results JSON
    if (isset($data['results'])) {
        $data['results'] = json_decode($data['results'], true) ?? $existing['results'] ?? [];
    }

    // Gallery: merge existing-keep list + newly uploaded files
    if (array_key_exists('gallery_keep', $_POST)) {
        $gallery = json_decode($_POST['gallery_keep'], true) ?? [];
        if (!empty($_FILES['gallery_images']['tmp_name'])) {
            foreach ($_FILES['gallery_images']['tmp_name'] as $key => $tmpName) {
                if ($_FILES['gallery_images']['error'][$key] !== UPLOAD_ERR_OK) continue;
                $file = [
                    'name'     => $_FILES['gallery_images']['name'][$key],
                    'type'     => $_FILES['gallery_images']['type'][$key],
                    'tmp_name' => $tmpName,
                    'error'    => $_FILES['gallery_images']['error'][$key],
                    'size'     => $_FILES['gallery_images']['size'][$key],
                ];
                $upload = handleFileUpload($file, 'portfolio');
                if ($upload['success']) {
                    $gallery[] = $upload['path'];
                }
            }
        }
        $data['gallery'] = $gallery;
    }

    $project = $db->update('portfolio', $id, $data);
    
    jsonResponse([
        'success' => true,
        'message' => 'Project updated successfully',
        'data' => $project
    ]);
}

function deleteProject($id) {
    global $db;
    
    $existing = $db->get('portfolio', $id);
    if (!$existing) {
        jsonResponse(['success' => false, 'message' => 'Project not found'], 404);
    }
    
    $db->delete('portfolio', $id);
    
    jsonResponse([
        'success' => true,
        'message' => 'Project deleted successfully'
    ]);
}