<?php
ini_set('display_errors', 1);

require_once '../../../resources/base_path_include.php';
require_once $base_path_to_learning_resources . "includes/connect.php"; // Use require for mandatory files
require_once $base_path_to_learning_resources . 'lib/function.php';
require_once $base_path_to_learning_resources . 'lib/validate_api_signature.php';

// Validation file
require_once $base_path_to_learning_resources . 'lib/validate_function.php';
require_once $base_path_to_learning . 'user_management/authenticate.php';
require_once $base_path_to_learning . 'functions/common_functions.php';

// Database access function
require_once $base_path_to_learning_resources . 'includes/specific_db_config.php';
require_once $base_path_to_learning . 'faculty_api/modules/subjectwise_attendance/subjectwise_functions.php';
require_once $base_path_to_learning . "faculty_api/faculty_function/common_faculty_function.php";
require_once $base_path_to_learning . "principal_api/principal_function/principal_function.php";

$postdata = json_decode(file_get_contents("php://input"), true);
checkIfNoPhpContentsReceive();

$required_fields = ['class_id', 'section_id', 'subject_id', 'date', 'api_signature', 'function_type', 'jwt_token'];
foreach ($required_fields as $field) {
    if (!isset($postdata[$field]) || !checkIfIssetAndNotEmpty($postdata[$field])) {
        errorreturn("Missing required field: $field");
    }
}

validateApiSignature($postdata['api_signature']);

$jwttoken = $postdata['jwt_token'];
$jwt_validate = authenticate_jwt($jwttoken);

if (!$jwt_validate) {
    errorreturn("Invalid JWT token.");
}

$userid = $jwt_validate->data->id;
$workspace_id = $jwt_validate->data->workspace_id;
$username = $jwt_validate->data->username;
$role = $jwt_validate->data->role;
$branch_id = $jwt_validate->data->branch_id;
$institution_id = $jwt_validate->data->institution_id;

$specific_db_name = validateUserAccess($conn_rjllearning, $userid, $role, $workspace_id, ["teacher"], null);
if (!$specific_db_name) {
    errorreturn('Access denied.');
} else {
    $conn_rjllearning_specific = dynamicDbConnection($specific_db_name);
}

require_once $base_path_to_learning . 'user_management/user_versioning.php';

$version = isset($_POST['version']) ? $_POST['version'] : (isset($postdata['version']) ? $postdata['version'] : null);
$updated_time = isset($_POST['updated_time']) ? $_POST['updated_time'] : (isset($postdata['updated_time']) ? $postdata['updated_time'] : null);

$response = user_data_refresh($conn_rjllearning,$conn_rjllearning_specific, $version, $updated_time, $userid, $institution_id);

$class_id = trim($postdata['class_id']);
$section_id = trim($postdata['section_id']);
$subject_id = trim($postdata['subject_id']);
$function_type = trim($postdata['function_type']);

$Faculty_Codes = $conn_rjllearning_specific->prepare("SELECT id FROM faculty_info WHERE userid = ? AND institution_id = ? AND branch_id = ?");
$Faculty_Codes->execute(array($userid, $institution_id, $branch_id));

// Fetch a single row instead of all
$result_faculty = $Faculty_Codes->fetch(PDO::FETCH_ASSOC);

// Check if the faculty exists
if ($result_faculty === false) {
    errorreturn("Faculty Not Found.");
}

// Retrieve the faculty_id from the result
$faculty_id = $result_faculty['id'];
$teacher_data = getClassSectionSubjectsAndInChargeRoles($conn_rjllearning, $conn_rjllearning_specific, $institution_id, $userid);
$class_section_subjects  = $teacher_data['class_section_subjects'];

$class_incharge_roles = $teacher_data['class_incharge_roles'];
$staff_access_modules = $teacher_data['staff_access_modules'];

$check_faculty_status = checkFacultyModuleGranted($function_type, $class_section_subjects, $class_incharge_roles, $staff_access_modules, $class_id, $section_id, $subject_id, $conn_rjllearning);
if ($check_faculty_status == false) {
    errorreturn("Access denied: You do not have the required permissions.");
}

if ($postdata['function_type'] == "specific_subjectwise_attendance") {

    $date = $postdata['date'];
    $result = getDateSpecificAttendance($conn_rjllearning_specific, $institution_id, $branch_id, $class_id, $section_id, $date, $subject_id);

    if ($result === false) {
        errorreturn("Error fetching specific subjectwise attendance.");
    } else {
        successreturn(['attendance_info' => $result]);
    }
} else {
    errorreturn("Invalid function type.");
}
