<?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/check_username_availability.php';
require_once $base_path_to_learning . 'user_management/authenticate.php';
require_once $base_path_to_learning . 'admin_api/academic_session/functions/registration_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 . 'user_management/faculty/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';

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

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

if (
    !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;

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

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

if($role == 'principal' or $role == 'teacher'){
    $institution_id = $jwt_validate->data->institution_id;
    $branch_id = $jwt_validate->data->branch_id;
    

    $version = isset($_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);
}

if($role == 'admin' or $role == 'superadmin'){
      if(!isset($postdata['institution_id']) or !checkIfIssetAndNotEmpty($postdata['institution_id']))
      {
           errorreturn("institution field is required.");
      }else{
            $institution_id = $postdata['institution_id'];
             if (isset($postdata['branch_id']) and !empty($postdata['branch_id'])) {
                $branch_id = trim($postdata['branch_id']);
            } else {
                $branch_id = "all";
            }
      }
}

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

    // Validate academic session
    $check_academic_confirmation = CheckAcademicSession($conn_rjllearning_specific, $institution_id);
    if ($check_academic_confirmation != true) {
        errorreturn("Access denied. Academic session not active.");
    }

    // Validate required parameter
    if (!isset($postdata['faculty_user_id']) || !is_numeric($postdata['faculty_user_id'])) {
        errorreturn("faculty_id is required and must be numeric.");
    }

    $faculty_id = (int)$postdata['faculty_user_id'];

    // Fetch current/active salary record from other_staff_details
    $query = "SELECT id, faculty_id, branch_id, basic_salary, date_created, time_created 
              FROM other_staff_details 
              WHERE institution_id = ? AND faculty_id = ?
              ORDER BY date_created DESC, time_created DESC
              LIMIT 1";
    $stmt = $conn_rjllearning_specific->prepare($query);
    $stmt->execute([$institution_id, $faculty_id]);
    $new_log = $stmt->fetch(PDO::FETCH_ASSOC);
    
    if (!$new_log) {
        errorreturn("No current salary record found for the given faculty.");
    }

    // Convert new_log time_created into readable time format
    if (!empty($new_log['time_created'])) {
        $new_log['time_created'] = date("H:i:s", strtotime($new_log['time_created']));
    }

    // Faculty name
    $faculty_stmt = $conn_rjllearning_specific->prepare("SELECT name FROM faculty_info WHERE id = ?");
    $faculty_stmt->execute([$faculty_id]);
    $faculty_data = $faculty_stmt->fetch(PDO::FETCH_ASSOC);
    $new_log['name'] = $faculty_data ? $faculty_data['name'] : null;

    // Branch info
    $new_log['branch_info'] = getBranchInfo($conn_rjllearning_specific, $institution_id, $new_log['branch_id']);

    // Fetch old salary history from staff_logs table
    $log_query = "SELECT id, faculty_id, branch_id, basic_salary, date_created, time_created
                  FROM staff_logs 
                  WHERE institution_id = ? AND faculty_id = ? 
                  ORDER BY date_created DESC, time_created DESC";
    $log_stmt = $conn_rjllearning_specific->prepare($log_query);
    $log_stmt->execute([$institution_id, $faculty_id]);
    $old_log = $log_stmt->fetchAll(PDO::FETCH_ASSOC);

    // Convert timestamp (time_created) into readable time format
    foreach ($old_log as &$log) {
        if (!empty($log['time_created'])) {
            $log['time_created'] = date("H:i:s", strtotime($log['time_created']));
        }
    }
    unset($log); // break reference

    // Return wrapped in salary_data
    successreturn([
        'salary_data' => [
            'new_log' => $new_log,
            'old_log' => $old_log
        ]
    ]);
}
