import { join, resolve } from "node:path";
import type { MuddleConfig, ResolvedConfig } from "../contracts/index.ts";

/** Applies the defaults of a project configuration. */
export function resolveConfig(
	config: MuddleConfig = {},
	root: string = process.cwd(),
): ResolvedConfig {
	const resolvedRoot = resolve(config.root ?? root);
	const views = config.views ?? "views";
	return {
		...config,
		root: resolvedRoot,
		views: resolve(resolvedRoot, views),
		components: resolve(
			resolvedRoot,
			config.components ?? join(views, "components"),
		),
		content: resolve(resolvedRoot, config.content ?? "content"),
		styles: resolve(resolvedRoot, config.styles ?? "styles"),
		publicDir: resolve(resolvedRoot, config.publicDir ?? "public"),
		viewRoots: (config.viewRoots ?? [views]).map((entry) =>
			resolve(resolvedRoot, entry),
		),
		loaders: config.loaders ?? {},
		collections: config.collections ?? [],
		integrations: config.integrations ?? [],
	};
}

/** Reads the configuration of a project from its `ct.config.ts`. */
export async function loadConfig(root: string): Promise<MuddleConfig> {
	const configPath = join(root, "ct.config.ts");
	const module = (await import(configPath)) as { default?: MuddleConfig };
	return module.default ?? {};
}