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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Student Daily Planner</title>
    <script src="https://cdn.tailwindcss.com"></script>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
    <style>
        @import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700&display=swap');
        
        body {
            font-family: 'Poppins', sans-serif;
            background-image: url('');
            background-size: cover;
            background-attachment: fixed;
            background-position: center;
            min-height: 100vh;
        }
        
        .glass-card {
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(10px);
            border-radius: 15px;
            box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.15);
        }
        
        .timeline-item::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            width: 2px;
            height: 100%;
            background-color: #4f46e5;
        }
        
        .period-card {
            transition: all 0.3s ease;
        }
        
        .period-card:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        }
        
        .notification-badge {
            position: absolute;
            top: -8px;
            right: -8px;
            width: 20px;
            height: 20px;
            background-color: #ef4444;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 10px;
        }
        
        @media (max-width: 768px) {
            .routine-grid {
                grid-template-columns: repeat(1, minmax(0, 1fr));
            }
        }
    </style>
</head>
<body class="py-8 px-4">
    <div class="max-w-6xl mx-auto">
        <!-- Header -->
        <header class="mb-8 text-center">
            <h1 class="text-4xl font-bold text-indigo-800 mb-2">Student Daily Planner</h1>
            <p class="text-lg text-indigo-600">Organize your tasks efficiently</p>
            <div class="mt-4 flex justify-center space-x-4">
                <button id="tasksTab" class="px-4 py-2 bg-indigo-600 text-white rounded-lg font-medium">Tasks</button>
            </div>
        </header>

        <!-- Main Content -->
        <main>
            <!-- Tasks Section -->
            <section id="tasksSection" class="glass-card p-6 mb-8">
                <div class="flex justify-between items-center mb-6">
                    <h2 class="text-2xl font-semibold text-indigo-700 flex items-center">
                        <i class="fas fa-tasks mr-2"></i> Today's Tasks
                    </h2>
                    <button id="addTaskBtn" class="px-4 py-2 bg-indigo-600 text-white rounded-lg hover:bg-indigo-700 flex items-center">
                        <i class="fas fa-plus mr-2"></i> Add Task
                    </button>
                </div>

                <!-- Add Task Modal -->
                <div id="taskModal" class="hidden fixed inset-0 bg-black bg-opacity-50 flex items-center justify-center z-50">
                    <div class="glass-card p-6 rounded-lg w-full max-w-md">
                        <div class="flex justify-between items-center mb-4">
                            <h3 class="text-xl font-semibold text-indigo-700">Add New Task</h3>
                            <button id="closeTaskModal" class="text-gray-500 hover:text-gray-700">
                                <i class="fas fa-times"></i>
                            </button>
                        </div>
                        <form id="taskForm" class="space-y-4">
                            <div>
                                <label for="taskTitle" class="block text-sm font-medium text-gray-700">Task Title</label>
                                <input type="text" id="taskTitle" class="mt-1 block w-full rounded-md border-gray-300 shadow-sm focus:border-indigo-500 focus:ring-indigo-500 p-2 border" required>
                            </div>
                            <div>
                                <label for="taskTime" class="block text-sm font-medium text-gray-700">Time</label>
                                <input type="time" id="taskTime" class="mt-1 block w-full rounded-md border-gray-300 shadow-sm focus:border-indigo-500 focus:ring-indigo-500 p-2 border" required>
                            </div>
                            <div>
                                <label for="taskTopic" class="block text-sm font-medium text-gray-700">Topic/Details</label>
                                <input type="text" id="taskTopic" class="mt-1 block w-full rounded-md border-gray-300 shadow-sm focus:border-indigo-500 focus:ring-indigo-500 p-2 border">
                            </div>
                            <div>
                                <label for="taskReminder" class="block text-sm font-medium text-gray-700">Reminder Before (minutes)</label>
                                <select id="taskReminder" class="mt-1 block w-full rounded-md border-gray-300 shadow-sm focus:border-indigo-500 focus:ring-indigo-500 p-2 border">
                                    <option value="5">5 minutes</option>
                                    <option value="10" selected>10 minutes</option>
                                    <option value="15">15 minutes</option>
                                </select>
                            </div>
                            <div class="flex justify-end space-x-3">
                                <button type="button" id="cancelTask" class="px-4 py-2 bg-gray-200 text-gray-700 rounded-lg hover:bg-gray-300">Cancel</button>
                                <button type="submit" class="px-4 py-2 bg-indigo-600 text-white rounded-lg hover:bg-indigo-700">Save Task</button>
                            </div>
                        </form>
                    </div>
                </div>

                <!-- Tasks Timeline -->
                <div id="tasksContainer" class="space-y-4">
                    <!-- Sample tasks will be inserted here by JavaScript -->
                    <div class="text-center py-8 text-gray-500" id="noTasksMessage">
                        <i class="fas fa-clipboard-list text-4xl mb-2"></i>
                        <p>No tasks added yet. Click "Add Task" to get started!</p>
                    </div>
                </div>
            </section>

    <script>
        // DOM Elements
        const tasksTab = document.getElementById('tasksTab');
        const routineTab = document.getElementById('routineTab');
        const tasksSection = document.getElementById('tasksSection');
        const routineSection = document.getElementById('routineSection');
        
        const addTaskBtn = document.getElementById('addTaskBtn');
        const taskModal = document.getElementById('taskModal');
        const closeTaskModal = document.getElementById('closeTaskModal');
        const cancelTask = document.getElementById('cancelTask');
        const taskForm = document.getElementById('taskForm');
        const tasksContainer = document.getElementById('tasksContainer');
        const noTasksMessage = document.getElementById('noTasksMessage');
        
        const addDayBtn = document.getElementById('addDayBtn');
        const dayModal = document.getElementById('dayModal');
        const closeDayModal = document.getElementById('closeDayModal');
        const cancelDay = document.getElementById('cancelDay');
        const dayForm = document.getElementById('dayForm');
        const periodsModal = document.getElementById('periodsModal');
        const closePeriodsModal = document.getElementById('closePeriodsModal');
        const cancelPeriods = document.getElementById('cancelPeriods');
        const periodsForm = document.getElementById('periodsForm');
        const periodsContainer = document.getElementById('periodsContainer');
        const routineContainer = document.getElementById('routineContainer');
        const noRoutineMessage = document.getElementById('noRoutineMessage');
        const periodsModalTitle = document.getElementById('periodsModalTitle');

        // Data
        let tasks = JSON.parse(localStorage.getItem('tasks')) || [];
        let routine = JSON.parse(localStorage.getItem('routine')) || {};
        let currentDay = '';
        let notificationTimeouts = {};

        // Initialize
        document.addEventListener('DOMContentLoaded', () => {
            renderTasks();
            renderRoutine();
            checkForNotifications();
        });

        // Tab Navigation
        tasksTab.addEventListener('click', () => {
            tasksSection.classList.remove('hidden');
            routineSection.classList.add('hidden');
            tasksTab.classList.add('bg-indigo-600', 'text-white');
            tasksTab.classList.remove('bg-white', 'text-indigo-600');
            routineTab.classList.add('bg-white', 'text-indigo-600');
            routineTab.classList.remove('bg-indigo-600', 'text-white');
        });

        routineTab.addEventListener('click', () => {
            routineSection.classList.remove('hidden');
            tasksSection.classList.add('hidden');
            routineTab.classList.add('bg-indigo-600', 'text-white');
            routineTab.classList.remove('bg-white', 'text-indigo-600');
            tasksTab.classList.add('bg-white', 'text-indigo-600');
            tasksTab.classList.remove('bg-indigo-600', 'text-white');
        });

        // Task Modal
        addTaskBtn.addEventListener('click', () => {
            taskModal.classList.remove('hidden');
        });

        closeTaskModal.addEventListener('click', () => {
            taskModal.classList.add('hidden');
        });

        cancelTask.addEventListener('click', () => {
            taskModal.classList.add('hidden');
        });

        // Task Form Submission
        taskForm.addEventListener('submit', (e) => {
            e.preventDefault();
            
            const title = document.getElementById('taskTitle').value;
            const time = document.getElementById('taskTime').value;
            const topic = document.getElementById('taskTopic').value;
            const reminder = parseInt(document.getElementById('taskReminder').value);
            
            const newTask = {
                id: Date.now(),
                title,
                time,
                topic,
                reminder,
                completed: false
            };
            
            tasks.push(newTask);
            saveTasks();
            renderTasks();
            scheduleNotification(newTask);
            
            taskForm.reset();
            taskModal.classList.add('hidden');
        });

        // Day Modal
        addDayBtn.addEventListener('click', () => {
            dayModal.classList.remove('hidden');
        });

        closeDayModal.addEventListener('click', () => {
            dayModal.classList.add('hidden');
        });

        cancelDay.addEventListener('click', () => {
            dayModal.classList.add('hidden');
        });

        // Day Form Submission
        dayForm.addEventListener('submit', (e) => {
            e.preventDefault();
            
            const day = document.getElementById('daySelect').value;
            const periodCount = parseInt(document.getElementById('periodCount').value);
            
            currentDay = day;
            periodsModalTitle.textContent = `Add Periods for ${day}`;
            
            // Clear previous inputs
            periodsContainer.innerHTML = '';
            
            // Create inputs for each period
            for (let i = 1; i <= periodCount; i++) {
                const periodDiv = document.createElement('div');
                periodDiv.className = 'space-y-2 p-4 bg-gray-50 rounded-lg mb-4';
                
                periodDiv.innerHTML = `
                    <h4 class="font-medium text-indigo-600">Period ${i}</h4>
                    <div>
                        <label for="subject-${i}" class="block text-sm font-medium text-gray-700">Subject</label>
                        <input type="text" id="subject-${i}" class="mt-1 block w-full rounded-md border-gray-300 shadow-sm focus:border-indigo-500 focus:ring-indigo-500 p-2 border" required>
                    </div>
                    <div class="grid grid-cols-2 gap-4">
                        <div>
                            <label for="startTime-${i}" class="block text-sm font-medium text-gray-700">Start Time</label>
                            <input type="time" id="startTime-${i}" class="mt-1 block w-full rounded-md border-gray-300 shadow-sm focus:border-indigo-500 focus:ring-indigo-500 p-2 border" required>
                        </div>
                        <div>
                            <label for="endTime-${i}" class="block text-sm font-medium text-gray-700">End Time</label>
                            <input type="time" id="endTime-${i}" class="mt-1 block w-full rounded-md border-gray-300 shadow-sm focus:border-indigo-500 focus:ring-indigo-500 p-2 border" required>
                        </div>
                    </div>
                `;
                
                periodsContainer.appendChild(periodDiv);
            }
            
            dayModal.classList.add('hidden');
            periodsModal.classList.remove('hidden');
        });

        // Periods Form Submission
        periodsForm.addEventListener('submit', (e) => {
            e.preventDefault();
            
            const periodCount = parseInt(document.getElementById('periodCount').value);
            const periods = [];
            
            for (let i = 1; i <= periodCount; i++) {
                const subject = document.getElementById(`subject-${i}`).value;
                const startTime = document.getElementById(`startTime-${i}`).value;
                const endTime = document.getElementById(`endTime-${i}`).value;
                
                periods.push({
                    number: i,
                    subject,
                    startTime,
                    endTime
                });
            }
            
            routine[currentDay] = periods;
            saveRoutine();
            renderRoutine();
            
            periodsModal.classList.add('hidden');
            dayForm.reset();
        });

        closePeriodsModal.addEventListener('click', () => {
            periodsModal.classList.add('hidden');
        });

        cancelPeriods.addEventListener('click', () => {
            periodsModal.classList.add('hidden');
        });

        // Render Tasks
        function renderTasks() {
            if (tasks.length === 0) {
                noTasksMessage.classList.remove('hidden');
                tasksContainer.innerHTML = '';
                return;
            }
            
            noTasksMessage.classList.add('hidden');
            
            // Sort tasks by time
            tasks.sort((a, b) => {
                return a.time.localeCompare(b.time);
            });
            
            tasksContainer.innerHTML = '';
            
            tasks.forEach(task => {
                const taskElement = document.createElement('div');
                taskElement.className = 'relative pl-8 timeline-item';
                taskElement.dataset.id = task.id;
                
                const timeParts = task.time.split(':');
                const formattedTime = `${parseInt(timeParts[0]) > 12 ? parseInt(timeParts[0]) - 12 : timeParts[0]}:${timeParts[1]} ${parseInt(timeParts[0]) >= 12 ? 'PM' : 'AM'}`;
                
                taskElement.innerHTML = `
                    <div class="bg-white p-4 rounded-lg shadow-sm border-l-4 border-indigo-500 relative">
                        <div class="absolute -left-3 top-4 w-6 h-6 rounded-full bg-indigo-500 flex items-center justify-center text-white">
                            <i class="fas fa-clock text-xs"></i>
                        </div>
                        <div class="flex justify-between items-start">
                            <div>
                                <h3 class="font-medium ${task.completed ? 'line-through text-gray-400' : 'text-gray-800'}">${task.title}</h3>
                                <p class="text-sm text-gray-500">${formattedTime}</p>
                                ${task.topic ? `<p class="text-sm text-gray-600 mt-1"><span class="font-medium">Topic:</span> ${task.topic}</p>` : ''}
                            </div>
                            <div class="flex space-x-2">
                                <button class="edit-task p-2 text-indigo-600 hover:text-indigo-800">
                                    <i class="fas fa-edit"></i>
                                </button>
                                <button class="delete-task p-2 text-red-600 hover:text-red-800">
                                    <i class="fas fa-trash"></i>
                                </button>
                                <button class="complete-task p-2 ${task.completed ? 'text-green-600' : 'text-gray-400 hover:text-green-600'}">
                                    <i class="fas fa-check"></i>
                                </button>
                            </div>
                        </div>
                    </div>
                `;
                
                tasksContainer.appendChild(taskElement);
            });
            
            // Add event listeners for task actions
            document.querySelectorAll('.edit-task').forEach(btn => {
                btn.addEventListener('click', (e) => {
                    const taskId = parseInt(e.target.closest('.timeline-item').dataset.id);
                    editTask(taskId);
                });
            });
            
            document.querySelectorAll('.delete-task').forEach(btn => {
                btn.addEventListener('click', (e) => {
                    const taskId = parseInt(e.target.closest('.timeline-item').dataset.id);
                    deleteTask(taskId);
                });
            });
            
            document.querySelectorAll('.complete-task').forEach(btn => {
                btn.addEventListener('click', (e) => {
                    const taskId = parseInt(e.target.closest('.timeline-item').dataset.id);
                    toggleTaskComplete(taskId);
                });
            });
        }

        // Render Routine
        function renderRoutine() {
            if (Object.keys(routine).length === 0) {
                noRoutineMessage.classList.remove('hidden');
                routineContainer.innerHTML = '';
                return;
            }
            
            noRoutineMessage.classList.add('hidden');
            routineContainer.innerHTML = '';
            
            Object.entries(routine).forEach(([day, periods]) => {
                const dayCard = document.createElement('div');
                dayCard.className = 'bg-white p-4 rounded-lg shadow-sm border-t-4 border-indigo-500';
                
                let periodsHTML = '';
                
                periods.forEach(period => {
                    periodsHTML += `
                        <div class="period-card bg-gray-50 p-3 rounded-lg mb-3 relative">
                            <div class="flex justify-between items-center">
                                <h4 class="font-medium text-indigo-700">Period ${period.number}: ${period.subject}</h4>
                                <div class="flex space-x-2">
                                    <button class="edit-period p-1 text-indigo-600 hover:text-indigo-800" data-day="${day}" data-period="${period.number}">
                                        <i class="fas fa-edit text-sm"></i>
                                    </button>
                                    <button class="delete-period p-1 text-red-600 hover:text-red-800" data-day="${day}" data-period="${period.number}">
                                        <i class="fas fa-trash text-sm"></i>
                                    </button>
                                </div>
                            </div>
                            <p class="text-sm text-gray-600 mt-1">
                                <i class="far fa-clock mr-1"></i> ${formatTime(period.startTime)} - ${formatTime(period.endTime)}
                            </p>
                        </div>
                    `;
                });
                
                dayCard.innerHTML = `
                    <div class="flex justify-between items-center mb-4">
                        <h3 class="text-lg font-semibold text-indigo-800">${day}</h3>
                        <div class="flex space-x-2">
                            <button class="add-period p-1 text-indigo-600 hover:text-indigo-800" data-day="${day}">
                                <i class="fas fa-plus-circle"></i>
                            </button>
                            <button class="delete-day p-1 text-red-600 hover:text-red-800" data-day="${day}">
                                <i class="fas fa-trash"></i>
                            </button>
                        </div>
                    </div>
                    <div class="periods-container">
                        ${periodsHTML}
                    </div>
                `;
                
                routineContainer.appendChild(dayCard);
            });
            
            // Add event listeners for routine actions
            document.querySelectorAll('.add-period').forEach(btn => {
                btn.addEventListener('click', (e) => {
                    const day = e.target.closest('.add-period').dataset.day;
                    addPeriod(day);
                });
            });
            
            document.querySelectorAll('.edit-period').forEach(btn => {
                btn.addEventListener('click', (e) => {
                    const day = e.target.closest('.edit-period').dataset.day;
                    const periodNum = parseInt(e.target.closest('.edit-period').dataset.period);
                    editPeriod(day, periodNum);
                });
            });
            
            document.querySelectorAll('.delete-period').forEach(btn => {
                btn.addEventListener('click', (e) => {
                    const day = e.target.closest('.delete-period').dataset.day;
                    const periodNum = parseInt(e.target.closest('.delete-period').dataset.period);
                    deletePeriod(day, periodNum);
                });
            });
            
            document.querySelectorAll('.delete-day').forEach(btn => {
                btn.addEventListener('click', (e) => {
                    const day = e.target.closest('.delete-day').dataset.day;
                    deleteDay(day);
                });
            });
        }

        // Task Actions
        function editTask(id) {
            const task = tasks.find(t => t.id === id);
            if (!task) return;
            
            document.getElementById('taskTitle').value = task.title;
            document.getElementById('taskTime').value = task.time;
            document.getElementById('taskTopic').value = task.topic || '';
            document.getElementById('taskReminder').value = task.reminder;
            
            // Remove the task from the array
            tasks = tasks.filter(t => t.id !== id);
            saveTasks();
            
            // Open the modal to edit
            taskModal.classList.remove('hidden');
        }

        function deleteTask(id) {
            if (confirm('Are you sure you want to delete this task?')) {
                tasks = tasks.filter(t => t.id !== id);
                saveTasks();
                renderTasks();
                
                // Clear any scheduled notification
                if (notificationTimeouts[id]) {
                    clearTimeout(notificationTimeouts[id]);
                    delete notificationTimeouts[id];
                }
            }
        }

        function toggleTaskComplete(id) {
            const task = tasks.find(t => t.id === id);
            if (task) {
                task.completed = !task.completed;
                saveTasks();
                renderTasks();
            }
        }

        // Routine Actions
        function addPeriod(day) {
            currentDay = day;
            periodsModalTitle.textContent = `Add Period to ${day}`;
            
            // Clear previous inputs
            periodsContainer.innerHTML = '';
            
            const periodDiv = document.createElement('div');
            periodDiv.className = 'space-y-2 p-4 bg-gray-50 rounded-lg mb-4';
            
            const nextPeriodNumber = routine[day] ? routine[day].length + 1 : 1;
            
            periodDiv.innerHTML = `
                <h4 class="font-medium text-indigo-600">New Period</h4>
                <div>
                    <label for="subject-new" class="block text-sm font-medium text-gray-700">Subject</label>
                    <input type="text" id="subject-new" class="mt-1 block w-full rounded-md border-gray-300 shadow-sm focus:border-indigo-500 focus:ring-indigo-500 p-2 border" required>
                </div>
                <div class="grid grid-cols-2 gap-4">
                    <div>
                        <label for="startTime-new" class="block text-sm font-medium text-gray-700">Start Time</label>
                        <input type="time" id="startTime-new" class="mt-1 block w-full rounded-md border-gray-300 shadow-sm focus:border-indigo-500 focus:ring-indigo-500 p-2 border" required>
                    </div>
                    <div>
                        <label for="endTime-new" class="block text-sm font-medium text-gray-700">End Time</label>
                        <input type="time" id="endTime-new" class="mt-1 block w-full rounded-md border-gray-300 shadow-sm focus:border-indigo-500 focus:ring-indigo-500 p-2 border" required>
                    </div>
                </div>
            `;
            
            periodsContainer.appendChild(periodDiv);
            
            // Change the form submit handler for adding a single period
            periodsForm.removeEventListener('submit', handlePeriodsFormSubmit);
            periodsForm.addEventListener('submit', handleAddPeriodSubmit);
            
            periodsModal.classList.remove('hidden');
            
            function handleAddPeriodSubmit(e) {
                e.preventDefault();
                
                const subject = document.getElementById('subject-new').value;
                const startTime = document.getElementById('startTime-new').value;
                const endTime = document.getElementById('endTime-new').value;
                
                if (!routine[day]) {
                    routine[day] = [];
                }
                
                routine[day].push({
                    number: nextPeriodNumber,
                    subject,
                    startTime,
                    endTime
                });
                
                saveRoutine();
                renderRoutine();
                
                periodsModal.classList.add('hidden');
                periodsForm.reset();
                
                // Restore the original form handler
                periodsForm.removeEventListener('submit', handleAddPeriodSubmit);
                periodsForm.addEventListener('submit', handlePeriodsFormSubmit);
            }
        }

        function editPeriod(day, periodNum) {
            const period = routine[day].find(p => p.number === periodNum);
            if (!period) return;
            
            currentDay = day;
            periodsModalTitle.textContent = `Edit Period ${periodNum} for ${day}`;
            
            // Clear previous inputs
            periodsContainer.innerHTML = '';
            
            const periodDiv = document.createElement('div');
            periodDiv.className = 'space-y-2 p-4 bg-gray-50 rounded-lg mb-4';
            
            periodDiv.innerHTML = `
                <h4 class="font-medium text-indigo-600">Period ${periodNum}</h4>
                <div>
                    <label for="subject-edit" class="block text-sm font-medium text-gray-700">Subject</label>
                    <input type="text" id="subject-edit" class="mt-1 block w-full rounded-md border-gray-300 shadow-sm focus:border-indigo-500 focus:ring-indigo-500 p-2 border" value="${period.subject}" required>
                </div>
                <div class="grid grid-cols-2 gap-4">
                    <div>
                        <label for="startTime-edit" class="block text-sm font-medium text-gray-700">Start Time</label>
                        <input type="time" id="startTime-edit" class="mt-1 block w-full rounded-md border-gray-300 shadow-sm focus:border-indigo-500 focus:ring-indigo-500 p-2 border" value="${period.startTime}" required>
                    </div>
                    <div>
                        <label for="endTime-edit" class="block text-sm font-medium text-gray-700">End Time</label>
                        <input type="time" id="endTime-edit" class="mt-1 block w-full rounded-md border-gray-300 shadow-sm focus:border-indigo-500 focus:ring-indigo-500 p-2 border" value="${period.endTime}" required>
                    </div>
                </div>
            `;
            
            periodsContainer.appendChild(periodDiv);
            
            // Change the form submit handler for editing a single period
            periodsForm.removeEventListener('submit', handlePeriodsFormSubmit);
            periodsForm.addEventListener('submit', handleEditPeriodSubmit);
            
            periodsModal.classList.remove('hidden');
            
            function handleEditPeriodSubmit(e) {
                e.preventDefault();
                
                const subject = document.getElementById('subject-edit').value;
                const startTime = document.getElementById('startTime-edit').value;
                const endTime = document.getElementById('endTime-edit').value;
                
                const periodIndex = routine[day].findIndex(p => p.number === periodNum);
                
                if (periodIndex !== -1) {
                    routine[day][periodIndex] = {
                        number: periodNum,
                        subject,
                        startTime,
                        endTime
                    };
                }
                
                saveRoutine();
                renderRoutine();
                
                periodsModal.classList.add('hidden');
                periodsForm.reset();
                
                // Restore the original form handler
                periodsForm.removeEventListener('submit', handleEditPeriodSubmit);
                periodsForm.addEventListener('submit', handlePeriodsFormSubmit);
            }
        }

        function deletePeriod(day, periodNum) {
            if (confirm('Are you sure you want to delete this period?')) {
                routine[day] = routine[day].filter(p => p.number !== periodNum);
                
                // Renumber remaining periods
                routine[day].forEach((p, index) => {
                    p.number = index + 1;
                });
                
                saveRoutine();
                renderRoutine();
            }
        }

        function deleteDay(day) {
            if (confirm(`Are you sure you want to delete all periods for ${day}?`)) {
                delete routine[day];
                saveRoutine();
                renderRoutine();
            }
        }

        function handlePeriodsFormSubmit(e) {
            e.preventDefault();
            
            const periodCount = parseInt(document.getElementById('periodCount').value);
            const periods = [];
            
            for (let i = 1; i <= periodCount; i++) {
                const subject = document.getElementById(`subject-${i}`).value;
                const startTime = document.getElementById(`startTime-${i}`).value;
                const endTime = document.getElementById(`endTime-${i}`).value;
                
                periods.push({
                    number: i,
                    subject,
                    startTime,
                    endTime
                });
            }
            
            routine[currentDay] = periods;
            saveRoutine();
            renderRoutine();
            
            periodsModal.classList.add('hidden');
            dayForm.reset();
        }

        // Helper Functions
        function saveTasks() {
            localStorage.setItem('tasks', JSON.stringify(tasks));
        }

        function saveRoutine() {
            localStorage.setItem('routine', JSON.stringify(routine));
        }

        function formatTime(timeStr) {
            if (!timeStr) return '';
            
            const [hours, minutes] = timeStr.split(':');
            const hourNum = parseInt(hours);
            const ampm = hourNum >= 12 ? 'PM' : 'AM';
            const displayHour = hourNum % 12 || 12;
            
            return `${displayHour}:${minutes} ${ampm}`;
        }

        function scheduleNotification(task) {
            if (!('Notification' in window)) {
                console.log('This browser does not support desktop notification');
                return;
            }
            
            // Check if notification permission is already granted
            if (Notification.permission !== 'granted') {
                Notification.requestPermission().then(permission => {
                    if (permission === 'granted') {
                        createNotificationTimeout(task);
                    }
                });
            } else {
                createNotificationTimeout(task);
            }
        }

        function createNotificationTimeout(task) {
            const taskTime = new Date();
            const [hours, minutes] = task.time.split(':');
            taskTime.setHours(parseInt(hours));
            taskTime.setMinutes(parseInt(minutes));
            
            const reminderTime = new Date(taskTime.getTime() - task.reminder * 60000);
            const now = new Date();
            
            // Only schedule if the reminder time is in the future
            if (reminderTime > now) {
                const timeout = reminderTime.getTime() - now.getTime();
                
                notificationTimeouts[task.id] = setTimeout(() => {
                    showNotification(task);
                }, timeout);
            }
        }

        function showNotification(task) {
            const notification = new Notification('Task Reminder', {
                body: `It's time to ${task.title}${task.topic ? ` (${task.topic})` : ''}`,
                icon: 'https://cdn-icons-png.flaticon.com/512/3652/3652191.png'
            });
            
            notification.onclick = () => {
                window.focus();
            };
        }

        function checkForNotifications() {
            tasks.forEach(task => {
                if (!task.completed) {
                    scheduleNotification(task);
                }
            });
        }
    </script>
</body>
</html>