<?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';
//db access function
require_once $base_path_to_learning_resources . 'includes/specific_db_config.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";


use Aws\S3\S3Client;
use Aws\S3\Exception\S3Exception;

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



if (
    // !isset($postdata['institution_id']) or !checkIfIssetAndNotEmpty($postdata['institution_id']) or
    !isset($postdata['homework_id']) or !checkIfIssetAndNotEmpty($postdata['homework_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);
// print_r($jwt_validate);

//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']);

$sql_codes = $conn_rjllearning_specific->prepare("SELECT id FROM faculty_info WHERE userid = ? AND institution_id = ? AND branch_id = ?");
    $sql_codes->execute(array($userid, $institution_id, $branch_id));
    $result_faculty = $sql_codes->fetch(PDO::FETCH_ASSOC);

    if ($result_faculty === false) {
        errorreturn("Faculty Not Found.");
    }
    $faculty_id = $result_faculty['id'];

function delete_HomeworkDetails($conn_rjllearning, $conn_rjllearning_specific, $s3_learning_bucket, $learning_bucketName, $userid, $institution_id, $branch_id, $homework_id, $function_type)
{
    $sql_select = "SELECT attachment, class_id, section_id, subject_id FROM homework WHERE id = ? AND institution_id = ? AND branch_id = ?";
    $stmt_select = $conn_rjllearning_specific->prepare($sql_select);
    $stmt_select->execute(array($homework_id, $institution_id, $branch_id));
    $homework_data = $stmt_select->fetch(PDO::FETCH_ASSOC);
    
    $class_id = $homework_data['class_id'];
    $section_id = !empty($homework_data['section_id']) ? json_decode($homework_data['section_id'], true) : [];
    $subject_id = $homework_data['subject_id'];
        
    $section_ids = [];
    foreach ($section_id as $section) {
        $section_ids[] = (int)$section; 
    }
    
    $teacher_data = getClassSectionSubjectsAndInChargeRoles($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 ($homework_data && !empty($homework_data['attachment'])) {
        $attachment_data = json_decode($homework_data['attachment'], true);
        
        if ($attachment_data && isset($attachment_data['filepath'])) {
            try {
                awsS3UserUploadDelete($s3_learning_bucket, $learning_bucketName, $conn_rjllearning_specific, $institution_id, $attachment_data['filepath'], null, null);
            } catch (Exception $e) {
                error_log("Failed to delete S3 file: " . $e->getMessage());
            }
        }
    }
   
    $sql = "DELETE FROM homework WHERE id = ? AND institution_id = ? AND branch_id = ?";
    $stmt = $conn_rjllearning_specific->prepare($sql);
    $stmt->execute(array($homework_id, $institution_id, $branch_id));
    $count = $stmt->rowCount();
    
    if($count == 1) {
        successreturn("Delete Homework Successfully");
    } else {
        errorreturn("Unable to delete Homework");
    }
}

if ($function_type  == "delete_homework") {
    $homework_id = trim($postdata['homework_id']);
    $check_academic_confirmation = CheckAcademicSession($conn_rjllearning_specific, $institution_id);
    if ($check_academic_confirmation != true) {
        errorreturn("Access denied. Academic session not active.");
    }
    
    $success['data'] = delete_HomeworkDetails($conn_rjllearning, $conn_rjllearning_specific, $s3_learning_bucket, $learning_bucketName, $userid, $institution_id, $branch_id, $homework_id, $function_type);
    successreturn($success);
}
