/**
 * Layout Renderer Module
 * Renders calculated paragraph layouts into the DOM with proper animations
 */
import { BaseModule } from './base-module.js';

class LayoutRendererModule extends BaseModule {
    constructor() {
        super('layout-renderer', 'Layout Renderer');
        
        // Module dependencies
        this.dependencies = ['animation-queue', 'tts-player'];
        
        // Configuration
        this.updateConfig({
            animation: {
                defaultSpeed: 1.0,
                wordAnimationClass: 'animate-word'
            }
        });
        
        // Bind methods
        this.bindMethods([
            'renderParagraph',
            'renderWord',
            'scheduleWordAnimation'
        ]);
    }
    
    /**
     * Initialize the module
     * @returns {Promise<boolean>} - Resolves with success status
     */
    async initialize() {
        try {
            this.reportProgress(10, "Initializing Layout Renderer");
            
            // Check for animation queue dependency
            const animationQueue = this.getModule('animation-queue');
            if (!animationQueue) {
                console.warn("Layout Renderer: Animation Queue module not found in registry");
                return false;
            }
            
            this.reportProgress(100, "Layout Renderer ready");
            return true;
        } catch (error) {
            console.error("Error initializing Layout Renderer:", error);
            return false;
        }
    }
    
    /**
     * Initialize default containers
     */
    initializeContainers() {
        // Check if story container exists
        const storyContainer = document.getElementById('story');
        if (!storyContainer) {
            console.log('Story container not found, creating it');
            const container = document.createElement('div');
            container.id = 'story';
            document.body.appendChild(container);
        }
    }
    
    /**
     * Render a paragraph from layout data
     * @param {Object} layout - Layout data from paragraph-layout
     * @param {Object} options - Rendering options
     * @returns {HTMLElement} - The created paragraph element
     */
    renderParagraph(layout, options = {}) {
        const animationQueue = this.getModule('animation-queue');
        
        const {
            container = document.getElementById('paragraphs'),
            id = `p-${Date.now()}`,
            className = '',
            style = {},
            animateWords = true,
            animationSpeed = this.config.animation.defaultSpeed,
            tts = false,
            onComplete = null
        } = options;
        
        if (!layout || !layout.breaks || !layout.nodes || !container) {
            console.error('Invalid layout data or container');
            return null;
        }
        
        // Create paragraph element
        const paragraphElement = document.createElement('p');
        paragraphElement.id = id;
        paragraphElement.className = `paragraph ${className}`.trim();
        paragraphElement.style.position = 'relative';
        
        // Get line height and container width for positioning
        const lineHeight = parseFloat(window.getComputedStyle(document.querySelector('#story')).lineHeight) || 1.5;
        const containerWidth = parseFloat(window.getComputedStyle(container).width);
        
        // Calculate paragraph height based on number of lines
        const numLines = layout.breaks.length - 1;
        const paragraphHeight = numLines * lineHeight;
        paragraphElement.style.height = `${paragraphHeight}em`;
        
        // Apply custom style properties
        for (const prop in style) {
            paragraphElement.style[prop] = style[prop];
        }
        
        // Populate with words
        const wordElements = [];
        let lineIndex = 0;
        let totalDelay = 0;
        
        // Calculate each word's position based on layout data
        for (let i = 0; i < layout.nodes.length; i++) {
            const wordNode = layout.nodes[i];
            
            // Get the current line index from breaks array
            while (lineIndex < layout.breaks.length - 1 && i >= layout.breaks[lineIndex + 1]) {
                lineIndex++;
            }
            
            // Create the word element
            const wordElement = this.renderWord(wordNode.text, animateWords);
            wordElements.push(wordElement);
            
            // Position the word absolutely within paragraph
            if (wordNode.x !== undefined && wordNode.y !== undefined) {
                // Use calculated position
                wordElement.style.position = 'absolute';
                wordElement.style.left = `${wordNode.x}px`;
                wordElement.style.top = `${lineIndex * lineHeight}em`;
            } else {
                // Fallback for missing positioning data
                wordElement.style.position = 'relative';
                wordElement.style.marginRight = '0.25em';
            }
            
            // Add to paragraph
            paragraphElement.appendChild(wordElement);
            
            // Handle whitespace after the word
            if (wordNode.spaceAfter) {
                const spaceElement = document.createElement('span');
                spaceElement.className = 'space';
                spaceElement.innerHTML = '&nbsp;';
                
                if (wordNode.x !== undefined) {
                    // Position space after word
                    spaceElement.style.position = 'absolute';
                    const wordWidth = wordElement.offsetWidth || wordNode.width || wordNode.text.length * 8;
                    spaceElement.style.left = `${wordNode.x + wordWidth}px`;
                    spaceElement.style.top = `${lineIndex * lineHeight}em`;
                } else {
                    spaceElement.style.position = 'relative';
                }
                
                paragraphElement.appendChild(spaceElement);
            }
        }
        
        // Add the paragraph to the container
        container.appendChild(paragraphElement);
        
        // Schedule animations for words if enabled
        if (animateWords && animationQueue) {
            // Schedule animations for each word with a faster timing
            const baseDelay = 0; // Starting delay
            const wordDelay = 20; // Delay between words in ms (reduced from 40)
            
            wordElements.forEach((wordElement, index) => {
                const delay = baseDelay + (index * wordDelay);
                totalDelay = Math.max(totalDelay, delay);
                
                this.scheduleWordAnimation(wordElement, delay, animationSpeed);
            });
            
            // Schedule TTS if enabled - start it earlier in the animation sequence
            if (tts) {
                const ttsPlayer = this.getModule('tts-player');
                if (ttsPlayer) {
                    // Get the full text for TTS
                    const fullText = layout.originalText || layout.processedText || paragraphElement.textContent;
                    
                    // Schedule TTS with the animation queue - start after just a few words appear
                    animationQueue.schedule(() => {
                        ttsPlayer.speak(fullText, (result) => {
                            if (!result || !result.success) {
                                console.warn('TTS playback issue:', result ? result.reason : 'unknown');
                            }
                        });
                    }, Math.min(100, wordDelay * 3)); // Start TTS earlier
                }
            }
            
            // Schedule completion callback
            if (onComplete && typeof onComplete === 'function') {
                const completionDelay = totalDelay + 200; // Reduced completion delay
                animationQueue.schedule(onComplete, completionDelay);
            }
        } else if (onComplete && typeof onComplete === 'function') {
            // If not animating, call onComplete immediately
            setTimeout(onComplete, 0);
        }
        
        return paragraphElement;
    }
    
    /**
     * Render a single word
     * @param {string} word - Word to render
     * @param {boolean} animate - Whether to prepare for animation
     * @returns {HTMLElement} - The created word element
     */
    renderWord(word, animate = true) {
        const wordElement = this.createWordElement(word);
        
        // Apply initial styles for animation
        if (animate) {
            wordElement.style.opacity = '0';
            wordElement.style.transform = 'translateY(5px)';
            wordElement.style.display = 'inline-block';
        }
        
        return wordElement;
    }
    
    /**
     * Create a word element
     * @param {string} word - Word to render
     * @returns {HTMLElement} - The created word element
     */
    createWordElement(word) {
        const wordElement = document.createElement('span');
        wordElement.className = 'word';
        wordElement.textContent = word;
        return wordElement;
    }
    
    /**
     * Schedule a word animation with the animation queue
     * @param {HTMLElement} wordElement - Word element to animate
     * @param {number} delay - Delay before animation starts
     * @param {number} speed - Animation speed factor
     */
    scheduleWordAnimation(wordElement, delay, speed) {
        const animationQueue = this.getModule('animation-queue');
        if (!animationQueue) return;
        
        const actualDelay = delay * speed;
        
        animationQueue.schedule(() => {
            wordElement.style.opacity = '1';
            wordElement.style.transform = 'translateY(0)';
            wordElement.style.transition = `opacity 0.2s ease-out, transform 0.3s ease-out`;
        }, actualDelay);
    }
}

// Create the singleton instance
const LayoutRenderer = new LayoutRendererModule();

// Export the module
export { LayoutRenderer };