// Task Manager Class
class TaskManager {
    constructor() {
        this.tasks = this.loadTasks();
        this.currentFilter = 'all';
        this.init();
    }

    init() {
        this.setupEventListeners();
        this.renderTasks();
        this.updateStats();
        this.startReminderScheduler();
    }

    setupEventListeners() {
        // Add task
        document.getElementById('addTaskBtn').addEventListener('click', () => this.addTask());
        document.getElementById('taskInput').addEventListener('keypress', (e) => {
            if (e.key === 'Enter') this.addTask();
        });

        // Filter buttons
        document.querySelectorAll('.filter-btn').forEach(btn => {
            btn.addEventListener('click', (e) => {
                this.setFilter(e.target.dataset.filter);
            });
        });

        // Email modal
        document.getElementById('closeEmailModal').addEventListener('click', () => {
            document.getElementById('emailModal').classList.add('hidden');
        });

        // Close modal on outside click
        document.getElementById('emailModal').addEventListener('click', (e) => {
            if (e.target.id === 'emailModal') {
                document.getElementById('emailModal').classList.add('hidden');
            }
        });
    }

    addTask() {
        const taskInput = document.getElementById('taskInput');
        const emailInput = document.getElementById('emailInput');
        const taskText = taskInput.value.trim();
        const email = emailInput.value.trim();

        if (!taskText) {
            this.showToast('Please enter a task', 'error');
            return;
        }

        if (!email || !this.isValidEmail(email)) {
            this.showToast('Please enter a valid email address', 'error');
            return;
        }

        const task = {
            id: Date.now(),
            text: taskText,
            email: email,
            completed: false,
            hasReminder: false,
            reminderStopped: false,
            createdAt: new Date().toISOString(),
            completedAt: null
        };

        this.tasks.push(task);
        this.saveTasks();
        this.renderTasks();
        this.updateStats();

        // Clear inputs
        taskInput.value = '';
        emailInput.value = '';

        this.showToast('Task added successfully!', 'success');
    }
    toggleTask(id) {
        const task = this.tasks.find(t => t.id === id);
        if (task) {
            task.completed = !task.completed;
            task.completedAt = task.completed ? new Date().toISOString() : null;
            
            // When task is completed, automatically stop reminders
            if (task.completed) {
                task.hasReminder = false;
                task.reminderStopped = true;
            }
            
            this.saveTasks();
            this.renderTasks();
            this.updateStats();

            if (task.completed) {
                this.showToast('Task completed! Great job! 🎉', 'success');
            } else {
                // If unchecking a completed task, reset reminder status
                task.reminderStopped = false;
                this.showToast('Task marked as incomplete', 'info');
            }
        }
    }
    toggleReminder(id) {
        const task = this.tasks.find(t => t.id === id);
        if (task) {
            if (task.completed) {
                this.showToast('Cannot set reminder for completed task', 'error');
                return;
            }
            
            if (task.hasReminder && !task.reminderStopped) {
                // Stop reminder
                task.hasReminder = false;
                task.reminderStopped = true;
                this.showToast('Reminder stopped', 'info');
            } else {
                // Start reminder
                task.hasReminder = true;
                task.reminderStopped = false;
                this.showToast('Reminder started! You\'ll receive email notifications every 30 seconds', 'success');
                this.showEmailPreview(task);
            }
            this.saveTasks();
            this.renderTasks();
            this.updateStats();
        }
    }
deleteTask(id) {
        if (confirm('Are you sure you want to delete this task?')) {
            this.tasks = this.tasks.filter(t => t.id !== id);
            this.saveTasks();
            this.renderTasks();
            this.updateStats();
            this.showToast('Task deleted', 'info');
        }
    }

    setFilter(filter) {
        this.currentFilter = filter;
        
        // Update button styles
        document.querySelectorAll('.filter-btn').forEach(btn => {
            if (btn.dataset.filter === filter) {
                btn.className = 'filter-btn px-4 py-2 bg-primary-500 text-white rounded-lg transition-colors';
            } else {
                btn.className = 'filter-btn px-4 py-2 bg-gray-200 text-gray-700 rounded-lg hover:bg-gray-300 transition-colors';
            }
        });
        
        this.renderTasks();
    }

    getFilteredTasks() {
        switch (this.currentFilter) {
            case 'pending':
                return this.tasks.filter(t => !t.completed);
            case 'completed':
                return this.tasks.filter(t => t.completed);
            case 'reminders':
                return this.tasks.filter(t => t.hasReminder && !t.reminderStopped && !t.completed);
            default:
                return this.tasks;
        }
    }

    renderTasks() {
        const container = document.getElementById('tasksContainer');
        const emptyState = document.getElementById('emptyState');
        const filteredTasks = this.getFilteredTasks();

        if (filteredTasks.length === 0) {
            container.innerHTML = '';
            emptyState.style.display = 'block';
            return;
        }

        emptyState.style.display = 'none';
        container.innerHTML = filteredTasks.map(task => `
            <task-card 
                id="${task.id}"
                text="${this.escapeHtml(task.text)}"
                email="${this.escapeHtml(task.email)}"
                completed="${task.completed}"
                has-reminder="${task.hasReminder}"
                reminder-stopped="${task.reminderStopped}"
                created-at="${task.createdAt}"
            ></task-card>
        `).join('');

        // Re-initialize feather icons for new elements
        feather.replace();
    }

    updateStats() {
        const total = this.tasks.length;
        const completed = this.tasks.filter(t => t.completed).length;
        const pending = total - completed;
        const reminders = this.tasks.filter(t => t.hasReminder && !t.reminderStopped && !t.completed).length;

        document.getElementById('totalTasks').textContent = total;
        document.getElementById('completedTasks').textContent = completed;
        document.getElementById('pendingTasks').textContent = pending;
        document.getElementById('activeReminders').textContent = reminders;
    }

    showEmailPreview(task) {
        document.getElementById('emailTo').textContent = task.email;
        document.getElementById('emailSubject').textContent = task.text;
        document.getElementById('emailTask').textContent = task.text;
        document.getElementById('emailModal').classList.remove('hidden');
    }
    startReminderScheduler() {
        // Simulate sending reminders every 30 seconds for demo
        setInterval(() => {
            this.tasks.forEach(task => {
                if (task.hasReminder && !task.reminderStopped && !task.completed) {
                    // In a real app, this would send an email
                    console.log(`Sending reminder for task: ${task.text} to ${task.email}`);
                    // Show a notification in the browser for demo purposes
                    this.showToast(`Reminder: ${task.text}`, 'info');
                }
            });
        }, 30000); // 30 seconds
    }
showToast(message, type = 'info') {
        const toast = document.createElement('div');
        const bgColor = type === 'success' ? 'bg-green-500' : type === 'error' ? 'bg-red-500' : 'bg-blue-500';
        
        toast.className = `fixed bottom-4 right-4 ${bgColor} text-white px-6 py-3 rounded-lg shadow-lg z-50 flex items-center gap-2 task-card-enter`;
        
        const icon = type === 'success' ? 'check-circle' : type === 'error' ? 'alert-circle' : 'info';
        toast.innerHTML = `
            <i data-feather="${icon}" class="w-5 h-5"></i>
            <span>${message}</span>
        `;
        
        document.body.appendChild(toast);
        feather.replace();
        
        setTimeout(() => {
            toast.style.opacity = '0';
            setTimeout(() => toast.remove(), 300);
        }, 3000);
    }

    isValidEmail(email) {
        return /^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(email);
    }

    escapeHtml(text) {
        const div = document.createElement('div');
        div.textContent = text;
        return div.innerHTML;
    }

    saveTasks() {
        localStorage.setItem('tasks', JSON.stringify(this.tasks));
    }

    loadTasks() {
        const saved = localStorage.getItem('tasks');
        return saved ? JSON.parse(saved) : [];
    }
}

// Custom event delegation for dynamic task cards
document.addEventListener('click', (e) => {
    if (e.target.closest('[data-action="toggle"]')) {
        const card = e.target.closest('task-card');
        taskManager.toggleTask(parseInt(card.id));
    } else if (e.target.closest('[data-action="reminder"]')) {
        const card = e.target.closest('task-card');
        taskManager.toggleReminder(parseInt(card.id));
    } else if (e.target.closest('[data-action="delete"]')) {
        const card = e.target.closest('task-card');
        taskManager.deleteTask(parseInt(card.id));
    }
});

// Initialize the app
const taskManager = new TaskManager();