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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 { readdir } from "node:fs/promises";
import { extname, relative } from "node:path";

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

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

async function htmlFilesToRollupInput(): Promise<Rollup.InputOption> {
	const files = await readdir(srcDir, { recursive: true });

	return files
		.filter((file) => extname(file) === ".html")
		.map((file) => new URL(file, srcDir).pathname);
}

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:
			// Vite はライブラリと通常の HTML 出力を同時に行えない仕様バグがあるため、
			// 環境変数でビルド対象を切り分けて複数回実行することで両方ビルドしている。
			process.env.TARGET === "lib"
				? {
						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"],
						},
					}
				: {
						emptyOutDir: true,
						outDir: "../docs-dist",
						rollupOptions: {
							input: await htmlFilesToRollupInput(),
						},
					},
	} satisfies UserConfig;
});