<?php

ini_set('display_errors', 1);

require_once '../../../../resources/base_path_include.php';

require_once $base_path_to_learning_resources . "includes/connect.php";
require_once $base_path_to_learning_resources . "lib/function.php";
require_once $base_path_to_learning_resources . "lib/validate_api_signature.php";
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_resources . "includes/specific_db_config.php";
require_once $base_path_to_learning_resources . 'lib/bucket_functions/bucket_functions.php';
require_once $base_path_to_learning . "vendor/autoload.php";
require_once $base_path_to_learning_resources . 'includes/aws_bucket_config.php';
require_once $base_path_to_learning . "user_management/functions/functions.php";
require_once $base_path_to_learning . "admin_api/modules/library_management/library_function.php";
require_once $base_path_to_learning . "admin_api/modules/transportation/fuel_expense/function_average_fuel_exepense.php";

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

checkIfNoPhpContentsReceive();

if (
    !isset($postdata['institution_id']) || !checkIfIssetAndNotEmpty($postdata['institution_id']) ||
    !isset($postdata['branch_id']) || !checkIfIssetAndNotEmpty($postdata['branch_id']) ||
    !isset($postdata['start_date']) || !checkIfIssetAndNotEmpty($postdata['start_date']) ||
    !isset($postdata['end_date']) || !checkIfIssetAndNotEmpty($postdata['end_date']) ||
    !isset($postdata['function_type']) || !checkIfIssetAndNotEmpty($postdata['function_type']) ||
    !isset($postdata['api_signature']) || !checkIfIssetAndNotEmpty($postdata['api_signature']) ||
    !isset($postdata['jwt_token']) || !checkIfIssetAndNotEmpty($postdata['jwt_token'])
) {
    errorreturn("All fields are required.");
}

// Validate API signature
validateApiSignature($postdata['api_signature']);

// Authenticate JWT token and extract user details
$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;
$name = $jwt_validate->data->name;
$institution_id = $jwt_validate->data->institution_id;
$branch_id = $jwt_validate->data->branch_id;

// Validate user access to the specific database
$specific_db_name = validateUserAccess($conn_rjllearning, $userid, $role, $workspace_id,['principal'], $institution_id);
if (!$specific_db_name) {
    errorreturn('Access denied.');
} else {
    // Establish dynamic DB connection
    $conn_rjllearning_specific = dynamicDbConnection($specific_db_name);
}

// Include necessary function files
require_once $base_path_to_learning . 'functions/common_functions.php';
require_once $base_path_to_learning . 'functions/get_branch_functions.php';
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);

// Validate academic session
$academicSessionId = CheckAcademicSession($conn_rjllearning_specific, $institution_id);
if (!$academicSessionId) {
    errorreturn("Invalid institution_id");
}

// Validate branch and institution combination
$isBranchClassSubjectValid = checkBranchClassSubject($conn_rjllearning_specific, $branch_id, null, null, $institution_id);
if (!$isBranchClassSubjectValid) {
    errorreturn("Invalid branch_id.");
}

// Handle different function types
if ($postdata['function_type'] == "fetch_specific_fuel_expense") {

    // Prepare variables
    $bus_id = isset($postdata['bus_id']) ? trim($postdata['bus_id']) : null; // Bus ID can be null
    $start_date = trim($postdata['start_date']);
    $end_date = trim($postdata['end_date']);

    if (!$start_date || !$end_date) {
        errorreturn("Start and end date are required.");
    }

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

    // Fetch fuel expenses and calculate average consumption
    //  calculateAverageFuelConsumption($conn_rjllearning_specific, $institution_id, $branch_id, $bus_id, $start_date, $end_date);
    $fetch_fuel_expense = calculateAverageFuelConsumption($conn_rjllearning_specific, $institution_id, $bus_id, $branch_id, $start_date, $end_date);

    if ($fetch_fuel_expense) {
        successreturn($fetch_fuel_expense);
    } else {
        errorreturn("No fuel expense found.");
    }

} else {
    errorreturn("Invalid function_type");
}

?>
