/**
===============================================================================
FILE: modules/web_api/static/js/tasks.js
ROLE: Управление боковой панелью задач (Drawer), фильтрация и рендеринг карточек.

AI-CONTEXT-ANCHORS:
  - ANCHOR[DRAWER_TOGGLE]: Открытие и закрытие выезжающей панели.
  - ANCHOR[TASKS_FILTER]: Фильтрация списка (ALL, IN_PROGRESS, BACKLOG, COMPLETED).
  - ANCHOR[TASKS_LOAD_FETCH]: Асинхронная загрузка задач через /api/v1/tasks.
  - ANCHOR[TASKS_RENDER_DOM]: Генерация HTML-карточек в боковом меню.
===============================================================================
*/

let currentFilter = 'ALL';
let allTasks = [];

// --- [SECTION 1: DRAWER TOGGLE] --- # ANCHOR[DRAWER_TOGGLE]
function toggleDrawer() {
    if (typeof IS_GUEST !== 'undefined' && IS_GUEST) return;
    const drawer = document.getElementById("task-drawer");
    const backdrop = document.getElementById("drawer-backdrop");
    if (!drawer) return;
    
    const isHidden = drawer.classList.contains("translate-x-full");
    if (isHidden) {
        drawer.classList.remove("translate-x-full");
        if (backdrop) backdrop.classList.remove("hidden");
        loadTasks();
    } else {
        drawer.classList.add("translate-x-full");
        if (backdrop) backdrop.classList.add("hidden");
    }
}

// --- [SECTION 2: FILTER CONTROL] --- # ANCHOR[TASKS_FILTER]
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();
}

// --- [SECTION 3: ASYNC DATA FETCH] --- # ANCHOR[TASKS_LOAD_FETCH]
async function loadTasks() {
    const badge = document.getElementById("task-count-badge");
    const container = document.getElementById("tasks-container");

    const token = typeof API_TOKEN !== 'undefined' && API_TOKEN ? API_TOKEN : localStorage.getItem("scud_api_auth_token");
    const isGuest = typeof IS_GUEST !== 'undefined' ? IS_GUEST : (localStorage.getItem("scud_is_guest") === "true");

    if (isGuest || !token) {
        if (badge) badge.innerText = "0";
        return;
    }

    try {
        const res = await fetch("/api/v1/tasks", {
            headers: { 
                "Authorization": "Bearer " + token,
                "Content-Type": "application/json"
            }
        });

        if (res.status === 401) {
            if (typeof logout === 'function') logout();
            return;
        }

        if (!res.ok) {
            throw new Error(`HTTP error! status: ${res.status}`);
        }

        const data = await res.json();

        if (Array.isArray(data)) {
            allTasks = data;
        } else if (data && Array.isArray(data.tasks)) {
            allTasks = data.tasks;
        } else if (data && typeof data === 'object') {
            allTasks = Object.values(data).find(val => Array.isArray(val)) || [];
        } else {
            allTasks = [];
        }

        if (badge) {
            badge.innerText = allTasks.length.toString();
        }

        renderTasks();

    } catch (err) {
        console.error("[Tasks Error]", err);
        if (badge) badge.innerText = "0";
        if (container) {
            container.innerHTML = `<div class="text-red-500 text-xs py-8 text-center font-medium">Ошибка обработки списка задач</div>`;
        }
    }
}

// --- [SECTION 4: DOM RENDERING] --- # ANCHOR[TASKS_RENDER_DOM]
function renderTasks() {
    const container = document.getElementById("tasks-container");
    if (!container) return;
    
    if (!Array.isArray(allTasks)) {
        allTasks = [];
    }

    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 statusLabel = "В планах";
        let cardBg = "bg-white";
        
        if (t.status === "COMPLETED") {
            statusBadge = "bg-emerald-50 text-emerald-700 border-emerald-300 font-semibold";
            statusLabel = "Завершено";
            cardBg = "bg-emerald-50/20";
        } else if (t.status === "IN_PROGRESS") {
            statusBadge = "bg-amber-50 text-amber-700 border-amber-300 font-bold";
            statusLabel = "В работе";
            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 || t.id || 'TASK'}</span>
                        <span class="text-[10px] uppercase px-1.5 py-0.5 rounded border ${priorityBadge}">${t.priority || 'MEDIUM'}</span>
                    </div>
                    <span class="text-[10px] uppercase px-2 py-0.5 rounded border ${statusBadge}">${statusLabel}</span>
                </div>
                <h3 class="text-xs font-semibold text-slate-800 mb-1 leading-snug">${t.title || t.description || ''}</h3>
                <div class="text-[10px] text-slate-400 font-mono flex items-center gap-1">
                    <i class="fa-solid fa-folder-closed text-slate-300"></i>
                    <span>${t.module || 'General'}</span>
                </div>
                ${dueDateHtml}
            </div>
        `;
    }).join("");
}