/**
 * Universal File System implementation
 * Browser: Uses OPFS (Origin Private File System)
 * Node.js: Uses built-in fs/promises
 * Serverless: Uses memory-based fallback
 */
import { isBrowser, isNode } from '../utils/environment.js';
let nodeFs = null;
// Dynamic import for Node.js fs (only in Node.js environment)
if (isNode()) {
    try {
        nodeFs = await import('fs/promises');
    }
    catch {
        // Ignore import errors in non-Node environments
    }
}
/**
 * Browser implementation using OPFS
 */
class BrowserFS {
    async getRoot() {
        if ('storage' in navigator && 'getDirectory' in navigator.storage) {
            return await navigator.storage.getDirectory();
        }
        throw new Error('OPFS not supported in this browser');
    }
    async getFileHandle(path, create = false) {
        const root = await this.getRoot();
        const parts = path.split('/').filter(p => p);
        let dir = root;
        for (let i = 0; i < parts.length - 1; i++) {
            dir = await dir.getDirectoryHandle(parts[i], { create });
        }
        const fileName = parts[parts.length - 1];
        return await dir.getFileHandle(fileName, { create });
    }
    async getDirHandle(path, create = false) {
        const root = await this.getRoot();
        const parts = path.split('/').filter(p => p);
        let dir = root;
        for (const part of parts) {
            dir = await dir.getDirectoryHandle(part, { create });
        }
        return dir;
    }
    async readFile(path, encoding) {
        try {
            const fileHandle = await this.getFileHandle(path);
            const file = await fileHandle.getFile();
            return await file.text();
        }
        catch (error) {
            throw new Error(`File not found: ${path}`);
        }
    }
    async writeFile(path, data, encoding) {
        const fileHandle = await this.getFileHandle(path, true);
        const writable = await fileHandle.createWritable();
        await writable.write(data);
        await writable.close();
    }
    async mkdir(path, options = { recursive: true }) {
        await this.getDirHandle(path, true);
    }
    async exists(path) {
        try {
            await this.getFileHandle(path);
            return true;
        }
        catch {
            try {
                await this.getDirHandle(path);
                return true;
            }
            catch {
                return false;
            }
        }
    }
    async readdir(path, options) {
        const dir = await this.getDirHandle(path);
        if (options?.withFileTypes) {
            const entries = [];
            for await (const [name, handle] of dir.entries()) {
                entries.push({
                    name,
                    isDirectory: () => handle.kind === 'directory',
                    isFile: () => handle.kind === 'file'
                });
            }
            return entries;
        }
        else {
            const entries = [];
            for await (const [name] of dir.entries()) {
                entries.push(name);
            }
            return entries;
        }
    }
    async unlink(path) {
        const parts = path.split('/').filter(p => p);
        const fileName = parts.pop();
        const dirPath = parts.join('/');
        if (dirPath) {
            const dir = await this.getDirHandle(dirPath);
            await dir.removeEntry(fileName);
        }
        else {
            const root = await this.getRoot();
            await root.removeEntry(fileName);
        }
    }
    async stat(path) {
        try {
            await this.getFileHandle(path);
            return { isFile: () => true, isDirectory: () => false };
        }
        catch {
            try {
                await this.getDirHandle(path);
                return { isFile: () => false, isDirectory: () => true };
            }
            catch {
                throw new Error(`Path not found: ${path}`);
            }
        }
    }
    async access(path, mode) {
        const exists = await this.exists(path);
        if (!exists) {
            throw new Error(`ENOENT: no such file or directory, access '${path}'`);
        }
    }
}
/**
 * Node.js implementation using fs/promises
 */
class NodeFS {
    async readFile(path, encoding = 'utf-8') {
        return await nodeFs.readFile(path, encoding);
    }
    async writeFile(path, data, encoding = 'utf-8') {
        await nodeFs.writeFile(path, data, encoding);
    }
    async mkdir(path, options = { recursive: true }) {
        await nodeFs.mkdir(path, options);
    }
    async exists(path) {
        try {
            await nodeFs.access(path);
            return true;
        }
        catch {
            return false;
        }
    }
    async readdir(path, options) {
        if (options?.withFileTypes) {
            return await nodeFs.readdir(path, { withFileTypes: true });
        }
        return await nodeFs.readdir(path);
    }
    async unlink(path) {
        await nodeFs.unlink(path);
    }
    async stat(path) {
        const stats = await nodeFs.stat(path);
        return {
            isFile: () => stats.isFile(),
            isDirectory: () => stats.isDirectory()
        };
    }
    async access(path, mode) {
        await nodeFs.access(path, mode);
    }
}
/**
 * Memory-based fallback for serverless/edge environments
 */
class MemoryFS {
    constructor() {
        this.files = new Map();
        this.dirs = new Set();
    }
    async readFile(path, encoding) {
        const content = this.files.get(path);
        if (content === undefined) {
            throw new Error(`File not found: ${path}`);
        }
        return content;
    }
    async writeFile(path, data, encoding) {
        this.files.set(path, data);
        // Ensure parent directories exist
        const parts = path.split('/').slice(0, -1);
        for (let i = 1; i <= parts.length; i++) {
            this.dirs.add(parts.slice(0, i).join('/'));
        }
    }
    async mkdir(path, options = { recursive: true }) {
        this.dirs.add(path);
        if (options.recursive) {
            const parts = path.split('/');
            for (let i = 1; i <= parts.length; i++) {
                this.dirs.add(parts.slice(0, i).join('/'));
            }
        }
    }
    async exists(path) {
        return this.files.has(path) || this.dirs.has(path);
    }
    async readdir(path, options) {
        const entries = new Set();
        const pathPrefix = path + '/';
        for (const filePath of this.files.keys()) {
            if (filePath.startsWith(pathPrefix)) {
                const relativePath = filePath.slice(pathPrefix.length);
                const firstSegment = relativePath.split('/')[0];
                entries.add(firstSegment);
            }
        }
        for (const dirPath of this.dirs) {
            if (dirPath.startsWith(pathPrefix)) {
                const relativePath = dirPath.slice(pathPrefix.length);
                const firstSegment = relativePath.split('/')[0];
                if (firstSegment)
                    entries.add(firstSegment);
            }
        }
        if (options?.withFileTypes) {
            return Array.from(entries).map(name => ({
                name,
                isDirectory: () => this.dirs.has(path + '/' + name),
                isFile: () => this.files.has(path + '/' + name)
            }));
        }
        return Array.from(entries);
    }
    async unlink(path) {
        this.files.delete(path);
    }
    async stat(path) {
        const isFile = this.files.has(path);
        const isDir = this.dirs.has(path);
        if (!isFile && !isDir) {
            throw new Error(`Path not found: ${path}`);
        }
        return {
            isFile: () => isFile,
            isDirectory: () => isDir
        };
    }
    async access(path, mode) {
        const exists = await this.exists(path);
        if (!exists) {
            throw new Error(`ENOENT: no such file or directory, access '${path}'`);
        }
    }
}
// Create the appropriate filesystem implementation
let fsImpl;
if (isBrowser()) {
    fsImpl = new BrowserFS();
}
else if (isNode() && nodeFs) {
    fsImpl = new NodeFS();
}
else {
    fsImpl = new MemoryFS();
}
// Export the filesystem operations
export const readFile = fsImpl.readFile.bind(fsImpl);
export const writeFile = fsImpl.writeFile.bind(fsImpl);
export const mkdir = fsImpl.mkdir.bind(fsImpl);
export const exists = fsImpl.exists.bind(fsImpl);
export const readdir = fsImpl.readdir.bind(fsImpl);
export const unlink = fsImpl.unlink.bind(fsImpl);
export const stat = fsImpl.stat.bind(fsImpl);
export const access = fsImpl.access.bind(fsImpl);
// Default export with promises namespace compatibility  
export default {
    readFile,
    writeFile,
    mkdir,
    exists,
    readdir,
    unlink,
    stat,
    access
};
// Named export for fs/promises compatibility
export const promises = {
    readFile,
    writeFile,
    mkdir,
    exists,
    readdir,
    unlink,
    stat,
    access
};
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