const HabitTrackerApp = {
    elements: {
        habitGrid: null,
        addHabitForm: null,
        addHabbitButton: null,
        filterButtons: []
    },

    currentFilter: 'all',

    init: function() {
        this.loadElements();
        this.render();
        this.setupEventListeners();
    },

    setupEventListeners: function() {
        // Обработчики для кнопок фильтров
        this.elements.filterButtons.forEach(button => {
            button.addEventListener('click', (event) => {
                const filter = event.target.dataset.filter;
                this.applyFilter(filter);
            });
        });

        // Делегирование событий для кнопок в карточках привычек
        this.elements.habitGrid.addEventListener('click', (event) => {
            const habitCard = event.target.closest('.habit-card');
            if (!habitCard) return;

            const habitId = parseInt(habitCard.dataset.habitId);

            if (event.target.classList.contains('js-habit-done')) {
                HabitManager.markHabitDone(habitId);
                HabitManager.saveToLocalStorage();
                this.render();
            } else if (event.target.classList.contains('js-habit-delete')) {
                HabitManager.deleteHabit(habitId);
                HabitManager.saveToLocalStorage();
                this.render();
            }
        });
    },

    loadElements: function() {
        this.elements.habitGrid = document.getElementById('habits-grid');
        this.elements.filterButtons = document.querySelectorAll('.filters__button');
    },

    applyFilter: function(filter) {
        this.currentFilter = filter;
        
        // Обновление активной кнопки фильтра
        this.elements.filterButtons.forEach(button => {
            if (button.dataset.filter === filter) {
                button.classList.remove('button--secondary');
                button.classList.add('button--primary');
            } else {
                button.classList.remove('button--primary');
                button.classList.add('button--secondary');
            }
        });

        this.render();
    },

    render: function() {
        const filteredHabits = HabitManager.getFilteredHabits(this.currentFilter);
        
        const habitsHTML = filteredHabits.map(habit => {
            const progress = (habit.currentCount / habit.targetCount) * 100;
            
            // Определение классов для карточки
            const cardClasses = ['habit-card'];
            if (habit.isCompleted) cardClasses.push('habit-card--completed');
            if (habit.isImportant) cardClasses.push('habit-card--important');
            if (habit.currentStreak >= 3) cardClasses.push('habit-card--streak');
            if (habit.currentCount === 0) cardClasses.push('habit-card--new');

            // Выбор иконки в зависимости от названия привычки
            let icon = '⭐';
            if (habit.name.includes('Медитация')) icon = '🧘';
            if (habit.name.includes('Учить')) icon = '💻';
            if (habit.name.includes('Спорт')) icon = '💪';
            if (habit.name.includes('Чтение')) icon = '📚';

            return `
                <div class="${cardClasses.join(' ')}" data-habit-id="${habit.id}">
                    <div class="habit-card__header">
                        <div class="habit-card__icon">${icon}</div>
                        <h3 class="habit-card__title">${habit.name}</h3>
                    </div>
                    <p class="habit-card__description">${habit.description}</p>
                    <div class="habit-card__progress">
                        <div class="habit-card__progress-info">
                            <span>Прогресс</span>
                            <span>${Math.round(progress)}%</span>
                        </div>
                        <div class="habit-card__progress-bar">
                            <div class="habit-card__progress-fill" style="width: ${progress}%"></div>
                        </div>
                    </div>
                    <div class="habit-card__actions">
                        <button class="button ${habit.isCompleted ? 'button--success' : 'button--primary'} js-habit-done">
                            ${habit.isCompleted ? 'Выполнено' : 'Отметить выполнение'}
                        </button>
                        <button class="button button--danger js-habit-delete">Удалить</button>
                    </div>
                </div>
            `;
        }).join('');

        this.elements.habitGrid.innerHTML = habitsHTML;
        
        // Обновление статистики в заголовке
        this.updateStats();
    },

    updateStats: function() {
        const totalHabits = HabitManager.habits.length;
        const completedHabits = HabitManager.habits.filter(h => h.isCompleted).length;
        const totalProgress = totalHabits > 0 ? Math.round((completedHabits / totalHabits) * 100) : 0;

        document.querySelector('.stats-panel__value:nth-child(1)').textContent = totalHabits;
        document.querySelector('.stats-panel__value:nth-child(2)').textContent = `${totalProgress}%`;
        document.querySelector('.stats-panel__value:nth-child(3)').textContent = HabitManager.stats.currentStreak;
    }
}

HabitTrackerApp.loadFromLocalStorage = function() {
    HabitManager.loadFromLocalStorage();

    if (HabitManager.habits.length === 0) {
        // Создание демо-привычек
        HabitManager.createHabit('Учить JavaScript', 'Писать код каждый день', 5, true);
        HabitManager.createHabit('Медитация', 'Ежедневная практика медитации по 10 минут', 1, false);
        HabitManager.createHabit('Спорт', 'Тренировка 30 минут', 3, true);
        HabitManager.createHabit('Чтение', 'Читать 20 страниц в день', 7, false);
        HabitManager.saveToLocalStorage();
    }
}

function openModal() {
    const modal = document.getElementById('habit-modal');
    modal.classList.add('modal--open');
    document.body.style.overflow = 'hidden';
    document.getElementById('habit-name').focus();
}

function closeModal() {
    const modal = document.getElementById('habit-modal');
    modal.classList.remove('modal--open');
    document.body.style.overflow = '';
}

    document.getElementById('add-habbit-button').addEventListener('click', openModal);
    document.querySelector('.modal__close').addEventListener('click', closeModal);
    document.getElementById('cancel-button').addEventListener('click', closeModal);
    
    document.querySelector('.modal__overlay').addEventListener('click',closeModal);
    
    document.addEventListener('keydown', function(event) {
        if (event.key === 'Escape') {
            closeModal();
        }
    });

    document.getElementById('habit-form').addEventListener('submit', function(event) {
        event.preventDefault();

        alert('Привычка добавлена!');
        closeModal();
    });