import assert from "node:assert/strict";
import { spawnSync } from "node:child_process";
import { accessSync, chmodSync, constants } from "node:fs";
import { mkdir, mkdtemp, rm, symlink, writeFile } from "node:fs/promises";
import { tmpdir } from "node:os";
import { dirname, join } from "node:path";
import { fileURLToPath } from "node:url";
import test from "node:test";

const LIB_SH = fileURLToPath(new URL("../scripts/lib.sh", import.meta.url));
const SYSTEM_KITTY = "/Applications/kitty.app/Contents/MacOS/kitty";

function systemKittyPath(): string | undefined {
	try {
		accessSync(SYSTEM_KITTY, constants.X_OK);
		return SYSTEM_KITTY;
	} catch {
		return undefined;
	}
}

function runDetectKitty(home: string, pathDir: string) {
	return spawnSync(
		"sh",
		["-c", `. "$1"; detect_kitty; status=$?; printf '%s' "$kitty_bin"; exit "$status"`, "sh", LIB_SH],
		{
			encoding: "utf8",
			env: { ...process.env, HOME: home, PATH: `${pathDir}:${process.env.PATH}` },
		},
	);
}

test("detect_kitty prefers an official install over a PATH kitty", async () => {
	const home = await mkdtemp(join(tmpdir(), "my-pi-libsh-"));
	try {
		const official = join(home, ".local", "kitty.app", "bin", "kitty");
		const pathDir = join(home, "pathbin");
		await mkdir(dirname(official), { recursive: true });
		await mkdir(pathDir, { recursive: true });
		await writeFile(official, "#!/bin/sh\n");
		chmodSync(official, 0o755);
		await symlink(official, join(pathDir, "kitty"));

		const result = runDetectKitty(home, pathDir);
		assert.equal(result.status, 0, result.stderr);
		// A real /Applications kitty also wins over $HOME/.local and PATH.
		assert.equal(result.stdout, systemKittyPath() ?? official);
	} finally {
		await rm(home, { recursive: true, force: true });
	}
});

test("detect_kitty falls back to a PATH kitty when no official install exists", async () => {
	const home = await mkdtemp(join(tmpdir(), "my-pi-libsh-"));
	try {
		const pathDir = join(home, "pathbin");
		const pathKitty = join(pathDir, "kitty");
		await mkdir(pathDir, { recursive: true });
		await writeFile(pathKitty, "#!/bin/sh\n");
		chmodSync(pathKitty, 0o755);

		const result = runDetectKitty(home, pathDir);
		assert.equal(result.status, 0, result.stderr);
		// The isolated HOME has no ~/.local install; only a machine-level
		// /Applications kitty (when present) still takes precedence.
		assert.equal(result.stdout, systemKittyPath() ?? pathKitty);
	} finally {
		await rm(home, { recursive: true, force: true });
	}
});