import { CompileOptions, Node } from '../../../interfaces';


export default function getGlobals(imports: Node[], options: CompileOptions) {
	const { globals, onerror, onwarn } = options;
	const globalFn = getGlobalFn(globals);

	return imports.map(x => {
		let name = globalFn(x.source.value);

		if (!name) {
			if (x.name.startsWith('__import')) {
				const error = new Error(
					`Could not determine name for imported module '${x.source
						.value}' – use options.globals`
				);
				if (onerror) {
					onerror(error);
				} else {
					throw error;
				}
			} else {
				const warning = {
					message: `No name was supplied for imported module '${x.source
						.value}'. Guessing '${x.name}', but you should use options.globals`,
				};

				if (onwarn) {
					onwarn(warning);
				} else {
					console.warn(warning); // eslint-disable-line no-console
				}
			}

			name = x.name;
		}

		return name;
	});
}

function getGlobalFn(globals: any): (id: string) => string {
	if (typeof globals === 'function') return globals;
	if (typeof globals === 'object') {
		return id => globals[id];
	}

	return () => undefined;
}