<?php
session_start();
require_once '../../config/db_config.php';

// Check if user is logged in
if (!isset($_SESSION['user_id'])) {
    echo json_encode(['success' => false, 'message' => 'You must be logged in to view documents']);
    exit;
}

$userId = $_SESSION['user_id'];

try {
    // Create connection
    $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    
    // Get all documents for the user
    $stmt = $conn->prepare("
        SELECT id, document_type, file_path, upload_date, status, admin_notes 
        FROM student_documents 
        WHERE user_id = ? 
        ORDER BY upload_date DESC
    ");
    $stmt->execute([$userId]);
    $documents = $stmt->fetchAll(PDO::FETCH_ASSOC);
    
    // Get the required document types
    $requiredDocuments = [
        'id_proof' => 'ID Proof',
        'address_proof' => 'Address Proof',
        'qualification_certificate' => 'Qualification Certificate',
        'passport_photo' => 'Passport Size Photo'
    ];
    
    // Format documents for response
    $formattedDocuments = [];
    $uploadedTypes = [];
    
    foreach ($documents as $document) {
        // Only include the most recent document of each type that's not rejected
        if (!in_array($document['document_type'], $uploadedTypes)) {
            $uploadedTypes[] = $document['document_type'];
            
            // Format the document status
            $statusBadge = '';
            switch ($document['status']) {
                case 'pending':
                    $statusBadge = '<span class="badge bg-warning text-dark">Pending</span>';
                    break;
                case 'verified':
                    $statusBadge = '<span class="badge bg-success">Verified</span>';
                    break;
                case 'rejected':
                    $statusBadge = '<span class="badge bg-danger">Rejected</span>';
                    break;
                default:
                    $statusBadge = '<span class="badge bg-secondary">Unknown</span>';
            }
            
            // Format the upload date
            $uploadDate = date('M d, Y', strtotime($document['upload_date']));
            
            // Format the document type
            $documentType = isset($requiredDocuments[$document['document_type']]) 
                ? $requiredDocuments[$document['document_type']] 
                : ucfirst(str_replace('_', ' ', $document['document_type']));
            
            $formattedDocuments[] = [
                'id' => $document['id'],
                'document_type' => $document['document_type'],
                'document_type_display' => $documentType,
                'file_path' => $document['file_path'],
                'upload_date' => $uploadDate,
                'status' => $document['status'],
                'status_badge' => $statusBadge,
                'admin_notes' => $document['admin_notes']
            ];
        }
    }
    
    // Check which required documents are missing
    $missingDocuments = [];
    foreach ($requiredDocuments as $type => $displayName) {
        if (!in_array($type, $uploadedTypes)) {
            $missingDocuments[] = [
                'document_type' => $type,
                'document_type_display' => $displayName
            ];
        }
    }
    
    // Get application status
    $stmt = $conn->prepare("
        SELECT status 
        FROM enrollment_applications 
        WHERE user_id = ? 
        ORDER BY application_date DESC 
        LIMIT 1
    ");
    $stmt->execute([$userId]);
    $application = $stmt->fetch(PDO::FETCH_ASSOC);
    $applicationStatus = $application ? $application['status'] : null;
    
    echo json_encode([
        'success' => true,
        'documents' => $formattedDocuments,
        'missing_documents' => $missingDocuments,
        'application_status' => $applicationStatus
    ]);
    
} catch (PDOException $e) {
    echo json_encode(['success' => false, 'message' => 'Database error: ' . $e->getMessage()]);
} catch (Exception $e) {
    echo json_encode(['success' => false, 'message' => 'Error: ' . $e->getMessage()]);
}
?>