const API_TOKEN = "scud_secret_token_2026";
const SESSION_ID = "web_session_main";
const STORAGE_KEY = 'scud_chat_input_history';

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

// === ИСТОРИЯ КОМАНД (LOCALSTORAGE + СТРЕЛКИ ВВЕРХ/ВНИЗ) ===
let inputHistory = JSON.parse(localStorage.getItem(STORAGE_KEY) || '[]');
let historyIndex = -1;

document.addEventListener('DOMContentLoaded', () => {
    const userInputEl = document.getElementById('user-input');

    if (userInputEl) {
        // Динамическое расширение высоты поля до 4 строк (~96px)
        userInputEl.addEventListener('input', function() {
            this.style.height = 'auto';
            this.style.height = Math.min(this.scrollHeight, 96) + 'px';
        });

        userInputEl.addEventListener('keydown', function(e) {
            if (e.key === 'Enter' && !e.shiftKey) {
                e.preventDefault();
                document.getElementById('chat-form').requestSubmit();
            }
            else if (e.key === 'ArrowUp') {
                if (inputHistory.length > 0 && historyIndex < inputHistory.length - 1) {
                    e.preventDefault();
                    if (historyIndex === -1) {
                        this.dataset.draft = this.value;
                    }
                    historyIndex++;
                    this.value = inputHistory[inputHistory.length - 1 - historyIndex];
                    this.dispatchEvent(new Event('input'));
                    setTimeout(() => this.setSelectionRange(this.value.length, this.value.length), 0);
                }
            }
            else if (e.key === 'ArrowDown') {
                if (historyIndex !== -1) {
                    e.preventDefault();
                    if (historyIndex > 0) {
                        historyIndex--;
                        this.value = inputHistory[inputHistory.length - 1 - historyIndex];
                    } else {
                        historyIndex = -1;
                        this.value = this.dataset.draft || '';
                    }
                    this.dispatchEvent(new Event('input'));
                    setTimeout(() => this.setSelectionRange(this.value.length, this.value.length), 0);
                }
            }
        });
    }

    loadTasks();
});

function toggleDrawer() {
    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 (f === status) {
            btn.className = "px-3 py-1.5 rounded-t-lg border-b-2 border-indigo-600 text-indigo-600 font-bold";
        } else {
            btn.className = "px-3 py-1.5 rounded-t-lg border-b-2 border-transparent hover:text-slate-700";
        }
    });
    renderTasks();
}

async function loadTasks() {
    try {
        const res = await fetch('/api/v1/tasks', {
            headers: { 'Authorization': `Bearer ${API_TOKEN}` }
        });
        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 = '';
        if (t.due_date) {
            dueDateHtml = `
                <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('');
}

async function sendMessage(e) {
    e.preventDefault();
    const input = document.getElementById('user-input');
    const chatWindow = document.getElementById('chat-window');
    const sendBtn = document.getElementById('send-btn');
    const text = input.value.trim();

    if (!text) return;

    if (inputHistory[inputHistory.length - 1] !== text) {
        inputHistory.push(text);
        if (inputHistory.length > 50) inputHistory.shift();
        localStorage.setItem(STORAGE_KEY, JSON.stringify(inputHistory));
    }
    historyIndex = -1;

    chatWindow.innerHTML += `
        <div class="flex justify-end">
            <div class="bg-indigo-600 text-white rounded-xl px-4 py-2.5 max-w-2xl text-sm shadow-sm">
                ${text}
            </div>
        </div>
    `;
    input.value = '';
    input.style.height = 'auto';
    chatWindow.scrollTop = chatWindow.scrollHeight;

    sendBtn.disabled = true;
    sendBtn.classList.add('opacity-50');

    try {
        const res = await fetch('/api/v1/chat', {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json',
                'Authorization': `Bearer ${API_TOKEN}`
            },
            body: JSON.stringify({ session_id: SESSION_ID, message: text })
        });

        const data = await res.json();

        chatWindow.innerHTML += `
            <div class="bg-white border border-slate-200 rounded-xl p-4 max-w-2xl shadow-sm">
                <p class="text-xs font-bold text-indigo-600 uppercase tracking-wider mb-1"><i class="fa-solid fa-robot mr-1"></i> ИИ-Ассистент</p>
                <p class="text-slate-700 text-sm whitespace-pre-wrap leading-relaxed">${data.reply}</p>
            </div>
        `;
        chatWindow.scrollTop = chatWindow.scrollHeight;
        loadTasks();

    } catch (err) {
        chatWindow.innerHTML += `
            <div class="bg-red-50 border border-red-200 rounded-xl p-4 max-w-2xl text-red-700 text-sm">
                Ошибка связи с сервером API.
            </div>
        `;
    } finally {
        sendBtn.disabled = false;
        sendBtn.classList.remove('opacity-50');
    }
}