import { Path } from './path';
import path from 'path';

export function fromLocalPath(pathStr: string): Path {
	return _fromLocalPath(pathStr, path);
}

export function fromWin32Path(pathStr: string): Path {
	return _fromLocalPath(pathStr, path.win32);
}

export function fromPosixPath(pathStr: string): Path {
	return _fromLocalPath(pathStr, path.posix);
}

function _fromLocalPath(pathStr: string, path: path.PlatformPath): Path {
	const sep = path.sep;
	let isDir = false;
	if (pathStr.endsWith(sep)) {
		isDir = true;
	}
	const parsed = path.parse(pathStr);
	const dirPathPart = parsed.dir.substr(parsed.root.length);
	let dirSegments: Array<string> = [];
	if (dirPathPart.length > 0) {
		dirSegments = dirPathPart.split(sep);
	}
	let base: string | undefined = parsed.base;
	let ext: string | undefined = parsed.ext;
	if (isDir) {
		dirSegments.push(parsed.base);
		base = undefined;
		ext = undefined;
	}
	return new Path(sep, parsed.root, base, ext, dirSegments, isDir);
}

export function fromQiniuPath(pathStr: string): Path {
	const sep = '/';
	let isDir = false;
	if (pathStr.endsWith(sep)) {
		isDir = true;
	}
	const segments = pathStr.split(sep);
	let basename: string | undefined = undefined;
	let ext: string | undefined = undefined;
	if (isDir) {
		segments.pop();
	} else {
		basename = segments.pop();
		if (basename) {
			ext = path.extname(basename);
		}
	}
	return new Path(sep, '', basename, ext, segments, isDir);
}