<?php

function h($value): string
{
    return htmlspecialchars((string)($value ?? ''), ENT_QUOTES, 'UTF-8');
}

function won($value): string
{
    return number_format((float)$value, 0) . '원';
}

function money_plain($value, int $decimals = 0): string
{
    return number_format((float)$value, $decimals);
}

function numf($value, int $decimals = 0): string
{
    return number_format((float)$value, $decimals);
}

function intvalf($value): string
{
    return number_format((int)$value);
}

function percentf($value, int $decimals = 1): string
{
    return number_format((float)$value, $decimals) . '%';
}

function blank_to_dash($value): string
{
    $value = trim((string)($value ?? ''));
    return $value === '' ? '-' : $value;
}

function ymd($value): string
{
    if (empty($value)) {
        return '-';
    }

    $ts = strtotime((string)$value);
    if ($ts === false) {
        return h((string)$value);
    }

    return date('Y-m-d', $ts);
}

function ym($value): string
{
    if (empty($value)) {
        return '-';
    }

    $ts = strtotime((string)$value . '-01');
    if ($ts === false) {
        return h((string)$value);
    }

    return date('Y-m', $ts);
}

function redirect(string $url): void
{
    header("Location: {$url}");
    exit;
}

function set_flash_message(string $type, string $message): void
{
    if (session_status() === PHP_SESSION_NONE) {
        session_start();
    }

    $_SESSION['flash_message'] = [
        'type' => $type,
        'message' => $message,
    ];
}

function get_flash_message(): ?array
{
    if (session_status() === PHP_SESSION_NONE) {
        session_start();
    }

    if (empty($_SESSION['flash_message'])) {
        return null;
    }

    $flash = $_SESSION['flash_message'];
    unset($_SESSION['flash_message']);
    return $flash;
}