<?php
session_start();
include_once('../../config/database.php');

// Check if admin is logged in
if (!isset($_SESSION['user_id']) || ($_SESSION['role'] !== 'admin' && $_SESSION['role'] !== 'director')) {
    echo json_encode([
        'success' => false,
        'message' => 'Unauthorized access'
    ]);
    exit();
}

try {
    // Get all documents with student information
    $query = "
        SELECT 
            d.id,
            d.user_id,
            d.document_type,
            d.document_path,
            d.upload_date,
            d.status,
            d.admin_notes,
            u.first_name,
            u.last_name,
            u.email
        FROM 
            student_documents d
        JOIN 
            users u ON d.user_id = u.id
        ORDER BY 
            d.upload_date DESC
    ";
    
    $result = $conn->query($query);
    
    if (!$result) {
        throw new Exception("Database query error: " . $conn->error);
    }
    
    $documents = [];
    while ($row = $result->fetch_assoc()) {
        $documents[] = $row;
    }
    
    // Get all students who have uploaded documents
    $students_query = "
        SELECT DISTINCT 
            u.id,
            CONCAT(u.first_name, ' ', u.last_name) AS name
        FROM 
            users u
        JOIN 
            student_documents d ON u.id = d.user_id
        ORDER BY 
            u.first_name, u.last_name
    ";
    
    $students_result = $conn->query($students_query);
    
    if (!$students_result) {
        throw new Exception("Failed to retrieve students: " . $conn->error);
    }
    
    $students = [];
    while ($row = $students_result->fetch_assoc()) {
        $students[] = $row;
    }
    
    // Format documents for response
    $formattedDocuments = [];
    $documentTypes = [
        'id_proof' => 'ID Proof',
        'address_proof' => 'Address Proof',
        'educational_certificate' => 'Educational Certificate',
        'photograph' => 'Passport Size Photo',
        'other' => 'Other Document'
    ];
    
    foreach ($documents as $document) {
        // 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
        $documentType = isset($documentTypes[$document['document_type']]) 
            ? $documentTypes[$document['document_type']] 
            : ucfirst(str_replace('_', ' ', $document['document_type']));
        
        // Format student name
        $studentName = $document['first_name'] . ' ' . $document['last_name'];
        
        $formattedDocuments[] = [
            'id' => $document['id'],
            'user_id' => $document['user_id'],
            'document_type' => $document['document_type'],
            'document_type_display' => $documentType,
            'document_path' => $document['document_path'],
            'upload_date' => $uploadDate,
            'status' => $document['status'],
            'status_badge' => $statusBadge,
            'admin_notes' => $document['admin_notes'],
            'student_name' => $studentName,
            'student_email' => $document['email']
        ];
    }
    
    echo json_encode([
        'success' => true,
        'data' => $formattedDocuments,
        'students' => $students
    ]);
    
} catch (Exception $e) {
    echo json_encode([
        'success' => false,
        'message' => 'Error: ' . $e->getMessage()
    ]);
}
?>