export function getBottomNavHTML() {
    return `
    <nav id="app-bottom-nav" aria-label="Główna nawigacja">
        <div class="bottom-dock">
            <div class="nav-slot">
                <button type="button" data-tab="planner" id="nav-planner" class="nav-tab is-active" aria-label="Planer" aria-current="page">
                    <i class="far fa-calendar-alt" aria-hidden="true"></i>
                    <span class="nav-label">Planer</span>
                </button>
            </div>
            <div class="nav-slot">
                <button type="button" data-tab="recipes" id="nav-recipes" class="nav-tab" aria-label="Katalog">
                    <i class="fas fa-search" aria-hidden="true"></i>
                    <span class="nav-label">Katalog</span>
                </button>
            </div>
            <div class="nav-slot">
                <button type="button" data-tab="pantry" id="nav-pantry" class="nav-tab" aria-label="Spiżarnia">
                    <i class="fas fa-warehouse" aria-hidden="true"></i>
                    <span class="nav-label">Spiżarnia</span>
                </button>
            </div>
            <div class="nav-slot" style="position:relative;">
                <button type="button" data-tab="shopping" id="nav-shopping" class="nav-tab" aria-label="Zakupy">
                    <i class="fas fa-cart-shopping" aria-hidden="true"></i>
                    <span class="nav-label">Zakupy</span>
                </button>
            </div>
        </div>
    </nav>
    `;
}

export function setupBottomNav({ refreshPantry, refreshShoppingList } = {}) {
    const main = document.getElementById('main-view');
    const planner = document.getElementById('planner-view');
    const pantry = document.getElementById('pantry-view');
    const shopping = document.getElementById('shopping-view');
    const nav = document.getElementById('app-bottom-nav');
    if (!main || !planner || !pantry || !shopping || !nav) return;

    const TABS = ['recipes', 'planner', 'pantry', 'shopping'];

    const apply = (tab) => {
        main.classList.toggle('hidden', tab !== 'recipes');
        planner.classList.toggle('hidden', tab !== 'planner');
        pantry.classList.toggle('hidden', tab !== 'pantry');
        shopping.classList.toggle('hidden', tab !== 'shopping');

        if (tab === 'pantry' && typeof refreshPantry === 'function') refreshPantry();
        if (tab === 'shopping' && typeof refreshShoppingList === 'function') refreshShoppingList();

        nav.querySelectorAll('.nav-tab[data-tab]').forEach((btn) => {
            const id = btn.getAttribute('data-tab');
            if (btn.hasAttribute('disabled')) return;
            if (TABS.includes(id)) {
                const isActive = id === tab;
                btn.classList.toggle('is-active', isActive);
                if (isActive) btn.setAttribute('aria-current', 'page');
                else btn.removeAttribute('aria-current');
            }
        });
    };

    nav.addEventListener('click', (e) => {
        const btn = e.target.closest('.nav-tab[data-tab]');
        if (!btn || btn.hasAttribute('disabled')) return;
        const tab = btn.getAttribute('data-tab');
        if (TABS.includes(tab)) apply(tab);
    });

    apply('planner');

    window.refreshStockViews = () => {
        if (typeof refreshPantry === 'function') refreshPantry();
    };
}