function toggleDrawer() {
    if (IS_GUEST) return;
    const drawer = document.getElementById('task-drawer');
    const backdrop = document.getElementById('drawer-backdrop');
    const isHidden = drawer.classList.contains('translate-x-full');
    if (isHidden) {
        drawer.classList.remove('translate-x-full');
        backdrop.classList.remove('hidden');
    } else {
        drawer.classList.add('translate-x-full');
        backdrop.classList.add('hidden');
    }
}

function setFilter(status) {
    currentFilter = status;
    ['ALL', 'IN_PROGRESS', 'BACKLOG', 'COMPLETED'].forEach(f => {
        const btn = document.getElementById(`filter-${f}`);
        if (btn) {
            btn.className = (f === status)
                ? "px-3 py-1.5 rounded-t-lg border-b-2 border-indigo-600 text-indigo-600 font-bold whitespace-nowrap"
                : "px-3 py-1.5 rounded-t-lg border-b-2 border-transparent whitespace-nowrap";
        }
    });
    renderTasks();
}

async function loadTasks() {
    if (IS_GUEST || !API_TOKEN) return;
    try {
        const res = await fetch('/api/v1/tasks', {
            headers: { 'Authorization': `Bearer ${API_TOKEN}` }
        });
        if (res.status === 401) {
            logout();
            return;
        }
        allTasks = await res.json();
        document.getElementById('task-count-badge').innerText = allTasks.length;
        renderTasks();
    } catch (err) {
        document.getElementById('tasks-container').innerHTML = `<div class="text-red-500 text-xs py-4 text-center">Ошибка загрузки задач</div>`;
    }
}

function renderTasks() {
    const container = document.getElementById('tasks-container');
    const filtered = allTasks.filter(t => currentFilter === 'ALL' || t.status === currentFilter);

    if (filtered.length === 0) {
        container.innerHTML = `<div class="text-slate-400 text-xs py-8 text-center">Нет задач с выбранным фильтром</div>`;
        return;
    }

    container.innerHTML = filtered.map(t => {
        let statusBadge = 'bg-slate-100 text-slate-600 border-slate-200';
        let cardBg = 'bg-white';
        if (t.status === 'COMPLETED') {
            statusBadge = 'bg-emerald-50 text-emerald-700 border-emerald-300 font-semibold';
            cardBg = 'bg-emerald-50/20';
        } else if (t.status === 'IN_PROGRESS') {
            statusBadge = 'bg-amber-50 text-amber-700 border-amber-300 font-bold';
            cardBg = 'bg-amber-50/20 border-amber-200';
        }

        let priorityBadge = 'text-slate-500 bg-slate-100 border-slate-200';
        if (t.priority === 'HIGH') priorityBadge = 'text-red-700 bg-red-50 border-red-200 font-bold';

        let dueDateHtml = t.due_date ? `
            <div class="mt-2 text-[11px] text-amber-800 bg-amber-50 border border-amber-200 px-2 py-0.5 rounded-md flex items-center gap-1.5 w-fit font-medium">
                <i class="fa-solid fa-clock text-amber-600"></i>
                <span>Срок: ${t.due_date}</span>
            </div>` : '';

        return `
            <div class="${cardBg} border border-slate-200 rounded-xl p-3.5 shadow-sm hover:shadow-md transition">
                <div class="flex justify-between items-center mb-1.5">
                    <div class="flex items-center gap-1.5">
                        <span class="font-mono text-xs font-bold text-slate-900 bg-slate-100 px-2 py-0.5 rounded border border-slate-200">${t.task_id}</span>
                        <span class="text-[10px] uppercase px-1.5 py-0.5 rounded border ${priorityBadge}">${t.priority || 'HIGH'}</span>
                    </div>
                    <span class="text-[10px] uppercase px-2 py-0.5 rounded border ${statusBadge}">${t.status}</span>
                </div>
                <h3 class="text-xs font-semibold text-slate-800 mb-1 leading-snug">${t.title}</h3>
                <div class="text-[10px] text-slate-400 font-mono flex items-center gap-1">
                    <i class="fa-solid fa-folder-closed text-slate-300"></i>
                    <span>${t.module}</span>
                </div>
                ${dueDateHtml}
            </div>
        `;
    }).join('');
}