<?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_all_faculty_basic_salaries") {

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

    // Pagination params
    $limit_param  = isset($postdata['limit']) ? $postdata['limit'] : 50;
    $offset_param = isset($postdata['offset']) && is_numeric($postdata['offset']) ? (int)$postdata['offset'] : 0;

    // Branch filter param
    $branch_param = isset($postdata['branch_id']) ? $postdata['branch_id'] : 'all';

    // Base count query
    $count_query = "SELECT COUNT(*) AS total_rows 
                    FROM other_staff_details 
                    WHERE institution_id = ?";
    $count_params = [$institution_id];

    if ($branch_param !== 'all') {
        $count_query .= " AND branch_id = ?";
        $count_params[] = $branch_param;
    }

    $count_stmt = $conn_rjllearning_specific->prepare($count_query);
    $count_stmt->execute($count_params);
    $count_result = $count_stmt->fetch(PDO::FETCH_ASSOC);
    $total_rows = $count_result['total_rows'];

    // Base SQL
    $query = "SELECT id, faculty_id, branch_id, basic_salary, date_created, time_created 
              FROM other_staff_details 
              WHERE institution_id = ?";
    $query_params = [$institution_id];

    if ($branch_param !== 'all') {
        $query .= " AND branch_id = ?";
        $query_params[] = $branch_param;
    }

    $query .= " ORDER BY date_created DESC, time_created DESC";

    // Apply limit/offset only if numeric
    if (is_numeric($limit_param)) {
        $limit = (int)$limit_param;
        $offset = $offset_param;
        $query .= " LIMIT $offset, $limit";
    }

    $stmt = $conn_rjllearning_specific->prepare($query);
    $stmt->execute($query_params);
    $faculty_salaries = $stmt->fetchAll(PDO::FETCH_ASSOC);

    if (!$faculty_salaries) {
        errorreturn("No faculty data found.");
    }

    $data = [];
    foreach ($faculty_salaries as $row) {
        // Faculty name
        $faculty_stmt = $conn_rjllearning_specific->prepare("SELECT name FROM faculty_info WHERE id = ?");
        $faculty_stmt->execute([$row['faculty_id']]);
        $faculty_data = $faculty_stmt->fetch(PDO::FETCH_ASSOC);

        $row['name'] = $faculty_data ? $faculty_data['name'] : null;

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

        $data[] = $row;
    }

    // Max reach calculation (only matters if numeric limit)
    $maxreach = 0;
    if (is_numeric($limit_param)) {
        $maxreach = (($offset_param + count($data)) >= $total_rows) ? 1 : 0;
    }

    successreturn([
        'total_rows' => $total_rows,
        'faculty_salaries' => $data,
        'maxreach' => $maxreach
    ]);
}
