import { mkdtemp, rm, writeFile } from "node:fs/promises";
import { tmpdir } from "node:os";
import { join } from "node:path";

import { afterEach, describe, expect, it, vi } from "vitest";

import { resolveRuntimeInput } from "./runtime-input.js";

let inputDirectory: string | undefined;

afterEach(async () => {
	vi.unstubAllEnvs();
	if (inputDirectory !== undefined) {
		await rm(inputDirectory, { recursive: true, force: true });
		inputDirectory = undefined;
	}
});

describe("resolveRuntimeInput", () => {
	it("returns the inline input when no payload path is configured", async () => {
		const fallback = { state: { cursor: "inline" } };

		await expect(resolveRuntimeInput(fallback)).resolves.toBe(fallback);
	});

	it("reads and parses the configured input payload", async () => {
		const fileInput = { state: { cursor: "file" } };
		const inputPath = await writeInputPayload(JSON.stringify(fileInput));

		vi.stubEnv("NOTION_INPUT_PAYLOAD_PATH", inputPath);

		await expect(resolveRuntimeInput({ state: { cursor: "inline" } })).resolves.toEqual(
			fileInput,
		);
	});

	it("returns the inline input when the configured payload is missing", async () => {
		const fallback = { state: { cursor: "inline" } };
		const directory = await createInputDirectory();

		vi.stubEnv("NOTION_INPUT_PAYLOAD_PATH", join(directory, "missing.json"));

		await expect(resolveRuntimeInput(fallback)).resolves.toBe(fallback);
	});

	it("rejects malformed input payloads", async () => {
		const inputPath = await writeInputPayload("{");

		vi.stubEnv("NOTION_INPUT_PAYLOAD_PATH", inputPath);

		await expect(resolveRuntimeInput(undefined)).rejects.toBeInstanceOf(SyntaxError);
	});
});

async function writeInputPayload(contents: string): Promise<string> {
	const directory = await createInputDirectory();
	const inputPath = join(directory, "input.json");
	await writeFile(inputPath, contents);
	return inputPath;
}

async function createInputDirectory(): Promise<string> {
	inputDirectory = await mkdtemp(join(tmpdir(), "notion-apps-input-"));
	return inputDirectory;
}