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* Asset Manager - Universal asset loading and management
* Handles CSS, images, fonts, and other static assets across environments
*/
import { detectRuntime, RuntimeEnvironment } from './runtime-detector.js';
export class AssetManager {
constructor(options = {}) {
this.options = {
baseUrl: '',
assetPaths: {},
preloadAssets: [],
lazyLoad: true,
cacheAssets: true,
optimizeImages: true,
inlineThreshold: 1024, // Inline assets smaller than this (bytes)
supportedFormats: {
images: ['png', 'jpg', 'jpeg', 'gif', 'svg', 'webp', 'avif'],
styles: ['css'],
fonts: ['woff', 'woff2', 'ttf', 'otf'],
scripts: ['js', 'mjs']
},
...options
};
this.environment = detectRuntime();
this.loadedAssets = new Map();
this.loadingAssets = new Map();
this.assetCache = new Map();
}
// Main asset loading method
async loadAsset(assetPath, options = {}) {
const resolvedPath = this.resolvePath(assetPath, options);
const assetType = this.getAssetType(resolvedPath);
const cacheKey = this.getCacheKey(resolvedPath, options);
// Return cached asset if available
if (this.options.cacheAssets && this.loadedAssets.has(cacheKey)) {
return this.loadedAssets.get(cacheKey);
}
// Return existing loading promise
if (this.loadingAssets.has(cacheKey)) {
return this.loadingAssets.get(cacheKey);
}
// Create loading promise
const loadingPromise = this.doLoadAsset(resolvedPath, assetType, options);
this.loadingAssets.set(cacheKey, loadingPromise);
try {
const asset = await loadingPromise;
if (this.options.cacheAssets) {
this.loadedAssets.set(cacheKey, asset);
}
return asset;
} finally {
this.loadingAssets.delete(cacheKey);
}
}
async doLoadAsset(assetPath, assetType, options = {}) {
switch (assetType) {
case 'css':
return await this.loadStylesheet(assetPath, options);
case 'image':
return await this.loadImage(assetPath, options);
case 'font':
return await this.loadFont(assetPath, options);
case 'script':
return await this.loadScript(assetPath, options);
case 'data':
return await this.loadData(assetPath, options);
default:
return await this.loadGeneric(assetPath, options);
}
}
// CSS loading
async loadStylesheet(cssPath, options = {}) {
if (this.environment === RuntimeEnvironment.BROWSER) {
return await this.loadBrowserStylesheet(cssPath, options);
} else {
return await this.loadServerStylesheet(cssPath, options);
}
}
async loadBrowserStylesheet(cssPath, options = {}) {
return new Promise((resolve, reject) => {
// Check if already loaded
const existing = document.querySelector(`link[href="${cssPath}"]`);
if (existing) {
resolve({ element: existing, cached: true });
return;
}
const link = document.createElement('link');
link.rel = 'stylesheet';
link.href = cssPath;
if (options.media) link.media = options.media;
if (options.crossorigin) link.crossOrigin = options.crossorigin;
link.onload = () => {
resolve({ element: link, loaded: true });
};
link.onerror = () => {
reject(new Error(`Failed to load stylesheet: ${cssPath}`));
};
document.head.appendChild(link);
});
}
async loadServerStylesheet(cssPath) {
try {
const response = await fetch(cssPath);
const content = await response.text();
return {
content,
path: cssPath,
inline: true
};
} catch (error) {
throw new Error(`Failed to load stylesheet: ${cssPath} - ${error.message}`);
}
}
// Image loading
async loadImage(imagePath, options = {}) {
if (this.environment === RuntimeEnvironment.BROWSER) {
return await this.loadBrowserImage(imagePath, options);
} else {
return await this.loadServerImage(imagePath, options);
}
}
async loadBrowserImage(imagePath, options = {}) {
return new Promise((resolve, reject) => {
const img = new Image();
if (options.crossorigin) img.crossOrigin = options.crossorigin;
if (options.loading) img.loading = options.loading; // lazy, eager
if (options.sizes) img.sizes = options.sizes;
if (options.srcset) img.srcset = options.srcset;
img.onload = () => {
resolve({
element: img,
width: img.naturalWidth,
height: img.naturalHeight,
path: imagePath
});
};
img.onerror = () => {
reject(new Error(`Failed to load image: ${imagePath}`));
};
img.src = imagePath;
});
}
async loadServerImage(imagePath) {
try {
const response = await fetch(imagePath);
const blob = await response.blob();
return {
blob,
size: blob.size,
type: blob.type,
path: imagePath
};
} catch (error) {
throw new Error(`Failed to load image: ${imagePath} - ${error.message}`);
}
}
// Font loading
async loadFont(fontPath, options = {}) {
if (this.environment === RuntimeEnvironment.BROWSER && 'fonts' in document) {
return await this.loadBrowserFont(fontPath, options);
} else {
return await this.loadGeneric(fontPath, options);
}
}
async loadBrowserFont(fontPath, options = {}) {
try {
const fontFace = new FontFace(
options.family || 'CustomFont',
`url(${fontPath})`,
{
style: options.style || 'normal',
weight: options.weight || 'normal',
stretch: options.stretch || 'normal'
}
);
await fontFace.load();
document.fonts.add(fontFace);
return {
fontFace,
family: options.family,
loaded: true
};
} catch (error) {
throw new Error(`Failed to load font: ${fontPath} - ${error.message}`);
}
}
// Script loading
async loadScript(scriptPath, options = {}) {
if (this.environment === RuntimeEnvironment.BROWSER) {
return await this.loadBrowserScript(scriptPath, options);
} else {
return await this.loadServerScript(scriptPath, options);
}
}
async loadBrowserScript(scriptPath, options = {}) {
return new Promise((resolve, reject) => {
// Check if already loaded
const existing = document.querySelector(`script[src="${scriptPath}"]`);
if (existing) {
resolve({ element: existing, cached: true });
return;
}
const script = document.createElement('script');
script.src = scriptPath;
if (options.type) script.type = options.type;
if (options.async !== undefined) script.async = options.async;
if (options.defer !== undefined) script.defer = options.defer;
if (options.crossorigin) script.crossOrigin = options.crossorigin;
script.onload = () => {
resolve({ element: script, loaded: true });
};
script.onerror = () => {
reject(new Error(`Failed to load script: ${scriptPath}`));
};
document.head.appendChild(script);
});
}
async loadServerScript(scriptPath, options = {}) {
try {
const response = await fetch(scriptPath);
const content = await response.text();
return {
content,
path: scriptPath,
type: options.type || 'text/javascript'
};
} catch (error) {
throw new Error(`Failed to load script: ${scriptPath} - ${error.message}`);
}
}
// Data loading (JSON, XML, etc.)
async loadData(dataPath) {
try {
const response = await fetch(dataPath);
const contentType = response.headers.get('content-type') || '';
let data;
if (contentType.includes('application/json')) {
data = await response.json();
} else if (contentType.includes('text/xml') || contentType.includes('application/xml')) {
const text = await response.text();
data = this.parseXML(text);
} else {
data = await response.text();
}
return {
data,
contentType,
path: dataPath
};
} catch (error) {
throw new Error(`Failed to load data: ${dataPath} - ${error.message}`);
}
}
parseXML(xmlString) {
if (typeof DOMParser !== 'undefined') {
const parser = new DOMParser();
return parser.parseFromString(xmlString, 'text/xml');
}
return xmlString;
}
// Generic loading
async loadGeneric(assetPath) {
try {
const response = await fetch(assetPath);
const blob = await response.blob();
return {
blob,
size: blob.size,
type: blob.type,
path: assetPath
};
} catch (error) {
throw new Error(`Failed to load asset: ${assetPath} - ${error.message}`);
}
}
// Path resolution
resolvePath(assetPath, options = {}) {
// Ensure assetPath is a string
if (typeof assetPath !== 'string') {
throw new Error(`Expected string path, got ${typeof assetPath}: ${assetPath}`);
}
// Absolute URLs
if (assetPath.startsWith('http://') || assetPath.startsWith('https://')) {
return assetPath;
}
// Data URLs
if (assetPath.startsWith('data:')) {
return assetPath;
}
// Blob URLs
if (assetPath.startsWith('blob:')) {
return assetPath;
}
// Check asset path mappings
if (this.options.assetPaths[assetPath]) {
return this.options.assetPaths[assetPath];
}
// Resolve relative to base URL
const baseUrl = options.baseUrl || this.options.baseUrl;
if (baseUrl) {
return new URL(assetPath, baseUrl).href;
}
return assetPath;
}
// Asset type detection
getAssetType(assetPath) {
const extension = this.getFileExtension(assetPath).toLowerCase();
if (this.options.supportedFormats.images.includes(extension)) {
return 'image';
}
if (this.options.supportedFormats.styles.includes(extension)) {
return 'css';
}
if (this.options.supportedFormats.fonts.includes(extension)) {
return 'font';
}
if (this.options.supportedFormats.scripts.includes(extension)) {
return 'script';
}
if (['json', 'xml'].includes(extension)) {
return 'data';
}
return 'generic';
}
getFileExtension(path) {
// Remove query parameters and hash
const cleanPath = path.split('?')[0].split('#')[0];
const parts = cleanPath.split('.');
return parts.length > 1 ? parts.pop() : '';
}
// Batch operations
async loadAssets(assetPaths, options = {}) {
const loadPromises = assetPaths.map(path =>
this.loadAsset(path, options).catch(error => ({ error, path }))
);
const results = await Promise.all(loadPromises);
return {
successful: results.filter(r => !r.error),
failed: results.filter(r => r.error)
};
}
// Preloading
async preloadAssets(assetPaths = null) {
const toPreload = assetPaths || this.options.preloadAssets;
if (this.environment === RuntimeEnvironment.BROWSER) {
return await this.preloadBrowserAssets(toPreload);
} else {
return await this.loadAssets(toPreload, { preload: true });
}
}
async preloadBrowserAssets(assetPaths) {
const preloadPromises = assetPaths.map(async (assetPath) => {
try {
const link = document.createElement('link');
link.rel = 'preload';
link.href = this.resolvePath(assetPath);
const assetType = this.getAssetType(assetPath);
switch (assetType) {
case 'css':
link.as = 'style';
break;
case 'script':
link.as = 'script';
break;
case 'font':
link.as = 'font';
link.crossOrigin = 'anonymous';
break;
case 'image':
link.as = 'image';
break;
}
document.head.appendChild(link);
return { success: true, path: assetPath };
} catch (error) {
return { success: false, path: assetPath, error };
}
});
return await Promise.all(preloadPromises);
}
// Cache management
getCacheKey(assetPath, options) {
return `${assetPath}::${JSON.stringify(options)}`;
}
clearCache() {
this.loadedAssets.clear();
this.assetCache.clear();
}
getCacheStats() {
return {
loaded: this.loadedAssets.size,
loading: this.loadingAssets.size,
cached: this.assetCache.size
};
}
// Asset optimization
shouldInline(assetPath, size = null) {
if (size && size <= this.options.inlineThreshold) {
return true;
}
return false;
}
async optimizeImage(imagePath, options = {}) {
// Placeholder for image optimization
// In a real implementation, this might compress images, convert formats, etc.
return await this.loadImage(imagePath, options);
}
// Utilities
addAssetPath(alias, path) {
this.options.assetPaths[alias] = path;
}
setBaseUrl(baseUrl) {
this.options.baseUrl = baseUrl;
}
isAssetLoaded(assetPath) {
const resolvedPath = this.resolvePath(assetPath);
return this.loadedAssets.has(this.getCacheKey(resolvedPath, {}));
}
getLoadedAssets() {
return Array.from(this.loadedAssets.keys());
}
}
// Factory function
export function createAssetManager(options = {}) {
return new AssetManager(options);
}
// Default asset manager instance
export const assetManager = new AssetManager();
// Convenience functions
export async function loadAsset(assetPath, options = {}) {
return await assetManager.loadAsset(assetPath, options);
}
export async function loadStylesheet(cssPath, options = {}) {
return await assetManager.loadStylesheet(cssPath, options);
}
export async function loadImage(imagePath, options = {}) {
return await assetManager.loadImage(imagePath, options);
}
export async function preloadAssets(assetPaths) {
return await assetManager.preloadAssets(assetPaths);
}
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