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// Web 向けのバンドラー、 Vite の設定ファイル。
// <https://vite.dev/>
//
// SPDX-FileCopyrightText: 2024 Shota FUJI <pockawoooh@gmail.com>
// SPDX-License-Identifier: AGPL-3.0-only

import { relative } from "node:path";

import { defineConfig, type UserConfig, type Rollup } from "vite";

const srcDir = new URL("./src/", import.meta.url);

function libraryCSSFiles(
	files: readonly URL[],
): Extract<Rollup.InputOption, Record<string, string>> {
	const entries: ReturnType<typeof libraryCSSFiles> = {};

	for (const file of files) {
		const displayPath = relative(process.cwd(), file.pathname);

		if (!file.toString().startsWith(srcDir.toString())) {
			console.warn(
				`You cannot specify CSS file outside src/ directory as library output: ${displayPath}`,
			);
			continue;
		}

		if (!file.pathname.endsWith(".css")) {
			console.warn(
				`You cannot pass non-CSS file to libraryCSSFiles function in Vite config: ${displayPath}`,
			);
			continue;
		}

		const name = file.toString().slice(srcDir.toString().length, -4);

		entries[name] = file.pathname;
	}

	return entries;
}

export default defineConfig(async () => {
	return {
		root: srcDir.pathname,
		build: {
			emptyOutDir: true,
			outDir: "../dist",
			cssCodeSplit: true,
			lib: {
				entry: {
					...libraryCSSFiles([
						new URL("./src/all.css", import.meta.url),
						new URL("./src/reset.css", import.meta.url),
						new URL("./src/global.css", import.meta.url),
						new URL("./src/vars/base.css", import.meta.url),
						new URL("./src/vars/dark.css", import.meta.url),
						new URL("./src/vars/contrast.css", import.meta.url),
						new URL("./src/vars/dark-contrast.css", import.meta.url),
					]),
					lib: new URL("./lib.ts", srcDir).pathname,
				},
				formats: ["es"],
			},
		},
	} satisfies UserConfig;
});