<?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 . 'academic_session/functions/validate_faculty.php';
// require_once $base_path_to_learning . 'academic_session/functions/functions.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';

$postdata = json_decode(file_get_contents("php://input"), true);
//print_r($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);
$userid = $jwt_validate->data->id;
$workspace_id = $jwt_validate->data->workspace_id;
$username = $jwt_validate->data->username;
$role = $jwt_validate->data->role;

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

function deleteHomeworkDetails($conn_rjllearning_specific, $s3_learning_bucket, $learning_bucketName, $institution_id, $homework_id)
{
    $sql_select = "SELECT attachment FROM homework WHERE id = ? AND institution_id = ?";
    $stmt_select = $conn_rjllearning_specific->prepare($sql_select);
    $stmt_select->execute(array($homework_id, $institution_id));
    $homework_data = $stmt_select->fetch(PDO::FETCH_ASSOC);
    
    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 = ?";
    $stmt = $conn_rjllearning_specific->prepare($sql);
    $stmt->execute(array($homework_id, $institution_id));
    $count = $stmt->rowCount();
    
    if($count == 1) {
        successreturn("Delete Homework Successfully");
    } else {
        errorreturn("Unable to delete Homework");
    }
}

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