// =======================================================================
// Notes Application - Feedback & Dev Bug Tracker Widget (Native ES Module)
// ChipDip-style floating chat for instant bug reporting & feature requests
// =======================================================================

import { api } from './api.js';
import { escapeHtml, showToast } from './ui.js';

let activeCategory = 'bug';
let isWidgetOpen = false;

function getCurrentContext() {
    const hash = window.location.hash || '#dictionary';
    const width = window.innerWidth;
    const height = window.innerHeight;
    const isMobile = width <= 768;

    let friendlyName = 'Главная';
    if (hash.startsWith('#reader/book/')) {
        const titleEl = document.getElementById('reader-book-title');
        const bookTitle = titleEl ? titleEl.textContent : 'Книга';
        friendlyName = `Читалка: ${bookTitle}`;
    } else if (hash.startsWith('#reader')) {
        friendlyName = 'Полка книг';
    } else if (hash.startsWith('#srs')) {
        friendlyName = 'SRS Тренировка';
    } else if (hash.startsWith('#grammar')) {
        friendlyName = 'Грамматика';
    } else if (hash.startsWith('#cefr')) {
        friendlyName = 'CEFR Тестирование';
    } else if (hash.startsWith('#lesson')) {
        friendlyName = 'Урок';
    } else if (hash.startsWith('#dictionary')) {
        friendlyName = 'Словарь & Поиск';
    }

    return {
        url: hash,
        friendlyName: friendlyName,
        data: {
            screen: `${width}×${height}`,
            device: isMobile ? 'Mobile' : 'Desktop',
            userAgent: navigator.userAgent.slice(0, 150),
            timestamp: new Date().toISOString()
        }
    };
}

function updateContextDisplay() {
    const indicator = document.getElementById('feedback-context-text');
    if (!indicator) return;
    const ctx = getCurrentContext();
    indicator.textContent = `${ctx.friendlyName} • ${ctx.data.device} (${ctx.data.screen})`;
}

function formatRelativeTime(isoString) {
    if (!isoString) return '';
    try {
        const date = new Date(isoString);
        return date.toLocaleDateString('ru-RU', {
            day: 'numeric',
            month: 'short',
            hour: '2-digit',
            minute: '2-digit'
        });
    } catch {
        return isoString;
    }
}

function createReportCard(r) {
    const card = document.createElement('div');
    card.className = 'feedback-msg-card';
    card.dataset.reportId = r.id;

    const catLabels = {
        bug: { label: '🐛 Баг', cls: 'bug' },
        feature: { label: '💡 Фича', cls: 'feature' },
        note: { label: '📝 Заметка', cls: 'note' }
    };
    const cat = catLabels[r.category] || catLabels.bug;

    const statusLabels = {
        new: { label: '🆕 Новый', cls: 'new' },
        in_progress: { label: '⏳ В работе', cls: 'in_progress' },
        resolved: { label: '✅ Исправлено', cls: 'resolved' },
        closed: { label: '✕ Закрыт', cls: 'resolved' }
    };
    const st = statusLabels[r.status] || statusLabels.new;

    const timeStr = formatRelativeTime(r.created_at);
    const contextStr = r.context_url ? escapeHtml(r.context_url) : '';

    card.innerHTML = `
        <div class="feedback-msg-header">
            <span class="feedback-msg-badge ${cat.cls}">${cat.label}</span>
            <span class="feedback-msg-status ${st.cls}">${st.label}</span>
        </div>
        <div class="feedback-msg-text">${escapeHtml(r.message)}</div>
        <div class="feedback-msg-meta">
            <span>${timeStr}</span>
            ${contextStr ? `<span>${contextStr}</span>` : ''}
        </div>
    `;
    return card;
}

export async function loadFeedbackList() {
    const listEl = document.getElementById('feedback-messages-list');
    const badgeEl = document.getElementById('feedback-badge');
    if (!listEl) return;

    try {
        const reports = await api.feedback.getAll();
        const activeCount = reports.filter(r => r.status === 'new' || r.status === 'in_progress').length;

        if (badgeEl) {
            if (activeCount > 0) {
                badgeEl.textContent = activeCount;
                badgeEl.classList.remove('hidden');
            } else {
                badgeEl.classList.add('hidden');
            }
        }

        listEl.innerHTML = '';
        if (reports.length === 0) {
            listEl.innerHTML = `
                <div class="feedback-empty-state">
                    <span class="empty-icon">📝</span>
                    <p>Нашли баг или есть идея для фичи?</p>
                    <small>Напишите сообщение ниже — оно сразу синхронизируется с AI-разработчиком.</small>
                </div>
            `;
            return;
        }

        reports.forEach(r => {
            listEl.appendChild(createReportCard(r));
        });

        // Scroll to bottom
        listEl.scrollTop = listEl.scrollHeight;
    } catch (err) {
        console.error('Failed to load feedback reports:', err);
    }
}

export function openFeedbackWidget() {
    const widget = document.getElementById('feedback-widget');
    const input = document.getElementById('feedback-input');
    if (!widget) return;

    isWidgetOpen = true;
    widget.classList.remove('hidden');
    updateContextDisplay();
    loadFeedbackList();

    setTimeout(() => {
        if (input) input.focus();
    }, 100);
}

export function closeFeedbackWidget() {
    const widget = document.getElementById('feedback-widget');
    if (!widget) return;
    isWidgetOpen = false;
    widget.classList.add('hidden');
}

export function toggleFeedbackWidget() {
    if (isWidgetOpen) {
        closeFeedbackWidget();
    } else {
        openFeedbackWidget();
    }
}

export function initFeedbackWidget() {
    const triggerBtn = document.getElementById('feedback-trigger-btn');
    const closeBtn = document.getElementById('feedback-close-btn');
    const widget = document.getElementById('feedback-widget');
    const form = document.getElementById('feedback-form');
    const input = document.getElementById('feedback-input');
    const sendBtn = document.getElementById('feedback-send-btn');
    const catChips = document.querySelectorAll('.feedback-cat-chip');

    if (triggerBtn) {
        triggerBtn.addEventListener('click', (e) => {
            e.stopPropagation();
            toggleFeedbackWidget();
        });
    }

    if (closeBtn) {
        closeBtn.addEventListener('click', (e) => {
            e.stopPropagation();
            closeFeedbackWidget();
        });
    }

    // Category chips selection
    catChips.forEach(chip => {
        chip.addEventListener('click', () => {
            catChips.forEach(c => c.classList.remove('active'));
            chip.classList.add('active');
            activeCategory = chip.dataset.category || 'bug';
            if (input) input.focus();
        });
    });

    // Close on Escape
    document.addEventListener('keydown', (e) => {
        if (e.key === 'Escape' && isWidgetOpen) {
            closeFeedbackWidget();
        }
    });

    // Enter to send, Shift+Enter for new line
    if (input) {
        input.addEventListener('keydown', (e) => {
            if (e.key === 'Enter' && !e.shiftKey) {
                e.preventDefault();
                if (form) form.requestSubmit();
            }
        });
    }

    // Form submit
    if (form) {
        form.addEventListener('submit', async (e) => {
            e.preventDefault();
            const text = input ? input.value.trim() : '';
            if (!text) return;

            const ctx = getCurrentContext();

            if (sendBtn) sendBtn.disabled = true;

            try {
                await api.feedback.create(activeCategory, text, ctx.url, ctx.data);
                showToast('✅ Репорт отправлен в бэклог AI-разработчику!', 'success');
                if (input) input.value = '';
                await loadFeedbackList();
            } catch (err) {
                console.error('Feedback submit error:', err);
                showToast(err.message || 'Ошибка отправки репорта', 'error');
            } finally {
                if (sendBtn) sendBtn.disabled = false;
                if (input) input.focus();
            }
        });
    }

    // Hash change updates context indicator if open
    window.addEventListener('hashchange', () => {
        if (isWidgetOpen) updateContextDisplay();
    });

    // Initial check of badge count
    loadFeedbackList();
}