/**
 * Claude Code binary lookup (src/agent/claude-code/binary.ts).
 *
 * The packaged desktop app often starts with a minimal PATH, so lookup falls
 * back to the standard install locations. A fake isExecutable set stands in
 * for the filesystem.
 */
import assert from "node:assert/strict";
import test from "node:test";

import { resolveClaudeBinary } from "../src/agent/claude-code/binary.ts";

const HOME = "/home/u";

function resolveWith(executables: string[], env: Record<string, string> = {}, platform: NodeJS.Platform = "linux", homeDir = HOME) {
	const found = new Set(executables);
	return resolveClaudeBinary({ env, platform, homeDir, isExecutable: (p) => found.has(p) });
}

test("prefers PATH hit", () => {
	const binary = resolveWith(["/usr/bin/claude", `${HOME}/.local/bin/claude`], { PATH: "/opt/x:/usr/bin" });
	assert.equal(binary, "/usr/bin/claude");
});

test("falls back to ~/.local/bin when PATH misses", () => {
	const binary = resolveWith([`${HOME}/.local/bin/claude`, "/usr/local/bin/claude"], { PATH: "/usr/bin" });
	assert.equal(binary, `${HOME}/.local/bin/claude`);
});

test("checks ~/.claude/local, npm global bin, /opt/homebrew/bin, /usr/local/bin in that order", () => {
	const all = [`${HOME}/.claude/local/claude`, `${HOME}/.npm-global/bin/claude`, "/opt/homebrew/bin/claude", "/usr/local/bin/claude"];
	for (let i = 0; i < all.length; i++) {
		assert.equal(resolveWith(all.slice(i), { PATH: "" }), all[i]);
	}
});

test("npm global bin follows npm_config_prefix when set", () => {
	const binary = resolveWith(["/opt/npm/bin/claude", `${HOME}/.npm-global/bin/claude`], { npm_config_prefix: "/opt/npm" });
	assert.equal(binary, "/opt/npm/bin/claude");
});

test("windows looks for claude.cmd and claude.exe", () => {
	const winHome = "C:\\Users\\u";
	const env = { PATH: "C:\\tools;C:\\bin", APPDATA: `${winHome}\\AppData\\Roaming` };
	assert.equal(resolveWith(["C:\\bin\\claude.cmd"], env, "win32", winHome), "C:\\bin\\claude.cmd");
	assert.equal(resolveWith(["C:\\bin\\claude.exe"], env, "win32", winHome), "C:\\bin\\claude.exe");
	assert.equal(resolveWith([`${winHome}\\.local\\bin\\claude.exe`], env, "win32", winHome), `${winHome}\\.local\\bin\\claude.exe`);
	assert.equal(
		resolveWith([`${winHome}\\AppData\\Roaming\\npm\\claude.cmd`], env, "win32", winHome),
		`${winHome}\\AppData\\Roaming\\npm\\claude.cmd`,
	);
	assert.equal(resolveWith(["C:\\bin\\claude"], env, "win32", winHome), null);
});

test("windows prefers claude.exe anywhere over claude.cmd, which Node cannot spawn without a shell", () => {
	const winHome = "C:\\Users\\u";
	const env = { PATH: "C:\\bin", APPDATA: `${winHome}\\AppData\\Roaming` };
	const executables = ["C:\\bin\\claude.cmd", `${winHome}\\.local\\bin\\claude.exe`];
	assert.equal(resolveWith(executables, env, "win32", winHome), `${winHome}\\.local\\bin\\claude.exe`);
});

test("returns null when every location misses", () => {
	assert.equal(resolveWith([], { PATH: "/usr/bin:/bin" }), null);
});