<?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';

//valdation 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';

require_once $base_path_to_learning . "vendor/autoload.php";
require_once $base_path_to_learning_resources . 'lib/bucket_functions/bucket_functions.php';
require_once $base_path_to_learning_resources . 'includes/aws_bucket_config.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";
require_once $base_path_to_learning . 'functions/common_functions.php';

use Aws\S3\S3Client;
use Aws\S3\Exception\S3Exception;
//db access function
require_once $base_path_to_learning_resources . 'includes/specific_db_config.php';

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

checkIfNoPhpContentsReceive();

if (
    // !isset($postdata['institution_id']) or !checkIfIssetAndNotEmpty($postdata['institution_id']) or
    !isset($postdata['api_signature']) or !checkIfIssetAndNotEmpty($postdata['api_signature']) or
    !isset($postdata['function_type']) or !checkIfIssetAndNotEmpty($postdata['function_type'])  or
    !isset($postdata['jwt_token']) or  !checkIfIssetAndNotEmpty($postdata['jwt_token'])
) {
    errorreturn("All * fields are required.");
}


validateApiSignature($postdata['api_signature']);

$jwttoken = $postdata['jwt_token'];
$jwt_validate = authenticate_jwt($jwttoken);
//then workspace_id is iin decodede data of jwt use from there
$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);

$function_type = trim($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'];

function getAllSubject($conn_rjllearning_specific, $institution_id, $class_id, $search_string, $faculty_id, $function_type, $conn_rjllearning, $userid, $limit, $offset)
{
    // Get teacher's permissions and assigned classes/sections/subjects
    $teacher_data = getClassSectionSubjectsAndInChargeRoles($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 if faculty has access to this function
    checkFacultyModuleGranted($function_type, $class_section_subjects, $class_incharge_roles, $staff_access_modules, $class_id, null, null, $conn_rjllearning);

    // Base SQL query for counting total rows
    $count_sql = "SELECT COUNT(DISTINCT id) as total_rows FROM subject_info 
                 WHERE institution_id = ? AND class_id = ? AND subject_name LIKE ?";
    $count_params = [$institution_id, $class_id, '%' . $search_string . '%'];
    
    // Apply faculty filters to the count query
    $count_sql_append = facultyFilterQueryAppend($count_sql, $count_params, $function_type, 
        $class_section_subjects, $class_incharge_roles, $staff_access_modules, 
        $class_id, null, null, $conn_rjllearning, 1, 1, 1, 1, true);
    
    $stmt = $conn_rjllearning_specific->prepare($count_sql_append['sql']);
    $stmt->execute($count_sql_append['array_params']);
    $result_total = $stmt->fetch();
    $totalrows = $result_total['total_rows'];

    // Main query to fetch subjects
    $sql = "SELECT DISTINCT id, class_id, type, subject_name FROM subject_info 
           WHERE institution_id = ? AND class_id = ? AND subject_name LIKE ?";
    $array_params = [$institution_id, $class_id, '%' . $search_string . '%'];

    // Apply LIMIT if not fetching all records
    if ($limit !== 'all') {
        $sql .= " LIMIT " . $offset . ", " . $limit;
    }

    // Apply faculty filters to the main query
    $sql_append_data = facultyFilterQueryAppend($sql, $array_params, $function_type, 
        $class_section_subjects, $class_incharge_roles, $staff_access_modules, 
        $class_id, null, null, $conn_rjllearning, 1, 1, 1, 1, true);
    
    $stmt = $conn_rjllearning_specific->prepare($sql_append_data['sql']);
    $stmt->execute($sql_append_data['array_params']);
    $result = $stmt->fetchAll();

    // Process results
    $array_return = [];
    foreach ($result as $rows) {
        $class_info = getClass($conn_rjllearning_specific, $institution_id, $rows['class_id']);
        
        $array_return[] = [
            'subject_id' => $rows['id'],
            'class_id' => $class_info,
            'type' => $rows['type'],
            'subject_name' => $rows['subject_name']
        ];
    }

    // Determine if we've reached the end of the list
    $maxreach = (count($result) < 50) ? 1 : 0;

    return [
        'total_rows' => $totalrows,
        'subject_info' => $array_return,
        'maxreach' => $maxreach
    ];
}

if ($postdata['function_type']  == "fetch_subject") {
   
    // $institution_id = trim($postdata['institution_id']);
     $check_academic_confirmation = CheckAcademicSession($conn_rjllearning_specific,$institution_id);
    if($check_academic_confirmation != true){
         errorreturn("Access denied. Academic session not active.");
    }
    // $branch_id = ($postdata['branch_id']);
    // $class_id = ($postdata['class_id']);
     if (isset($postdata['class_id']) and !empty($postdata['class_id'])) {
        $class_id = trim($postdata['class_id']);
    } else {
        $class_id = null;
    }
    if (isset($postdata['search_string']) and !empty($postdata['search_string'])) {
        $search_string = trim($postdata['search_string']);
    } else {
        $search_string = null;
    }

    $limit = $postdata['limit'];

    $page = (isset($postdata['page']) and isNumeric($postdata['page'])) ? (int)$postdata['page'] : 1;
    if($limit != 'all'){
        $offset = ($page - 1) * $limit;
        $success['data'] = getAllSubject($conn_rjllearning_specific, $institution_id,$class_id, $search_string, $faculty_id, $function_type, $conn_rjllearning, $userid,  $limit, $offset);
        successreturn($success);
    }else{
        $success['data'] = getAllSubject($conn_rjllearning_specific, $institution_id,$class_id, $search_string, $faculty_id, $function_type, $conn_rjllearning, $userid,  $limit, null);
        successreturn($success);
        
    }
}
