class LessonManager {
    constructor() {
        this.lessons = JSON.parse(localStorage.getItem('lessons')) || [];
        this.currentLessonIndex = 0;
        this.currentSlideIndex = 0;
    }

    saveLessons() {
        localStorage.setItem('lessons', JSON.stringify(this.lessons));
    }

    addLesson(title) {
        const newLesson = {
            id: Date.now(),
            title: title || `New Lesson ${this.lessons.length + 1}`,
            slides: [this.createNewSlide()]
        };
        this.lessons.push(newLesson);
        this.saveLessons();
        return newLesson;
    }

    createNewSlide() {
        return {
            id: Date.now(),
            title: 'New Slide',
            content: '',
            notes: '',
            pinyin: '',
            translation: '',
            characters: ''
        };
    }

    addSlide(lessonIndex) {
        const newSlide = this.createNewSlide();
        this.lessons[lessonIndex].slides.push(newSlide);
        this.saveLessons();
        return newSlide;
    }

    updateSlide(lessonIndex, slideIndex, data) {
        const slide = this.lessons[lessonIndex].slides[slideIndex];
        Object.assign(slide, data);
        this.saveLessons();
    }

    deleteSlide(lessonIndex, slideIndex) {
        this.lessons[lessonIndex].slides.splice(slideIndex, 1);
        this.saveLessons();
    }

    deleteLesson(lessonIndex) {
        this.lessons.splice(lessonIndex, 1);
        this.saveLessons();
    }
}

// Initialize speech recognition
function initSpeechRecognition(lang = 'cmn-Hans-CN') {
    const recognition = new (window.SpeechRecognition || window.webkitSpeechRecognition)();
    recognition.lang = lang;
    recognition.interimResults = true;
    
    return recognition;
}

// Fullscreen slide functionality
function toggleFullscreenSlide(slideElement) {
    if (!document.fullscreenElement) {
        slideElement.classList.add('fullscreen-slide');
        slideElement.requestFullscreen().catch(err => {
            console.error(`Error attempting to enable fullscreen: ${err.message}`);
        });
    } else {
        document.exitFullscreen();
        slideElement.classList.remove('fullscreen-slide');
    }
}

// Initialize the app
document.addEventListener('DOMContentLoaded', () => {
    const lessonManager = new LessonManager();
    window.lessonManager = lessonManager; // Make it globally available
    
    // Event listeners will be handled by the web components
});