import { mkdir, mkdtemp, readFile, rm, writeFile } from "node:fs/promises";
import { tmpdir } from "node:os";
import { join } from "node:path";
import { afterEach, describe, expect, it } from "vitest";
import { buildExtension } from "./build.ts";
import { readBuildSpec } from "./spec.ts";

const roots: string[] = [];
afterEach(async () => {
	await Promise.all(
		roots.splice(0).map((root) => rm(root, { recursive: true, force: true })),
	);
});
async function fixture(): Promise<{ root: string; source: string }> {
	const root = await mkdtemp(join(tmpdir(), "canvas-browser-build-"));
	roots.push(root);
	const source = join(root, "extensions", "canvas");
	await mkdir(join(source, "browser"), { recursive: true });
	await mkdir(join(source, "node_modules", "fonts", "files"), {
		recursive: true,
	});
	await writeFile(
		join(root, "package.json"),
		JSON.stringify({ version: "1.0.0" }),
	);
	await writeFile(
		join(source, "package.json"),
		JSON.stringify({
			name: "@test/canvas",
			main: "index.ts",
			"pi-ext": {
				browserEntries: ["browser/main.tsx"],
				assets: { "browser/fonts": "fonts/files" },
			},
		}),
	);
	await writeFile(
		join(source, "index.ts"),
		"export default function register() {}\n",
	);
	await writeFile(
		join(source, "browser", "main.tsx"),
		"document.title = 'browser-only-canvas'; export const client = true;\n",
	);
	await writeFile(
		join(source, "node_modules", "fonts", "files", "font.woff2"),
		"font fixture",
	);
	return { root, source };
}
describe("browser package entries", () => {
	it("emits flat browser entries and dependency directories independently of node startup", async () => {
		const { root, source } = await fixture();
		expect(readBuildSpec(source).browserEntries).toEqual({
			main: "browser/main.tsx",
		});
		const built = await buildExtension("canvas", { root });
		expect(built.entries).toEqual(["index.ts"]);
		expect(
			await readFile(join(built.dir, "browser", "main.js"), "utf8"),
		).toContain("browser-only-canvas");
		expect(await readFile(join(built.dir, "index.ts"), "utf8")).not.toContain(
			"browser-only-canvas",
		);
		expect(
			await readFile(join(built.dir, "browser", "fonts", "font.woff2"), "utf8"),
		).toBe("font fixture");
		const release = await buildExtension("canvas", { root, release: true });
		expect(
			await readFile(join(release.dir, "browser", "main.js"), "utf8"),
		).toContain("browser-only-canvas");
	});
	it("preserves usable package when a browser source becomes invalid", async () => {
		const { root, source } = await fixture();
		const built = await buildExtension("canvas", { root });
		const original = await readFile(
			join(built.dir, "browser", "main.js"),
			"utf8",
		);
		await rm(join(source, "browser", "main.tsx"));
		await expect(buildExtension("canvas", { root })).rejects.toThrow(
			"does not exist",
		);
		expect(await readFile(join(built.dir, "browser", "main.js"), "utf8")).toBe(
			original,
		);
	});
});