#!/usr/bin/env node
// qs-doc.mjs: open or print docs for the installed Quickshell version.
// Cross-platform: no shell, no POSIX assumptions. Pure Node builtins.
//
// Usage:
//   qs-doc <Type>             # print URL for a type
//   qs-doc --list             # print type index URL
//   qs-doc <Type> --open      # open in default browser
//   qs-doc <Type> --print     # print URL (explicit; same as default)
//
// Type names use the dot-path shown in the docs (e.g. PanelWindow,
// Quickshell.Services.Pipewire.Pipewire).

import { spawnSync } from "node:child_process";
import { platform } from "node:os";

function getVersion() {
	for (const bin of ["qs", "quickshell"]) {
		const r = spawnSync(bin, ["--version"], { encoding: "utf8" });
		if (r.status === 0) {
			const m = r.stdout.match(/(\d+\.\d+\.\d+)/);
			if (m) return m[1];
		}
	}
	return null;
}

function usage() {
	process.stderr.write(
		"usage: qs-doc <Type> [--open|--print]\n" +
			"       qs-doc --list\n" +
			"  Type: doc path like PanelWindow or Quickshell.Services.Pipewire.Pipewire\n" +
			"  --open  open the URL in the default browser\n" +
			"  --print print the URL to stdout (default if stdout is a tty)\n",
	);
}

function openUrl(url) {
	const os = platform();
	// Try each platform's open command. Each is a separate spawn without a shell.
	const candidates =
		os === "darwin"
			? [["open", [url]]]
			: os === "win32"
				? [["cmd", ["/c", "start", "", url]]]
				: [
						["xdg-open", [url]],
						["wslview", [url]],
						["sensible-browser", [url]],
					];
	for (const [cmd, args] of candidates) {
		const r = spawnSync(cmd, args, { stdio: "ignore" });
		if (r.status === 0) return true;
	}
	return false;
}

const argv = process.argv.slice(2);
if (argv.length === 0) {
	usage();
	process.exit(1);
}
const wantList = argv[0] === "--list";
const wantOpen = argv.includes("--open");
const wantPrint = argv.includes("--print") || !wantOpen;
const type = wantList ? null : argv.find((a) => !a.startsWith("--"));

if (!wantList && !type) {
	usage();
	process.exit(1);
}

const version = getVersion();
if (!version) {
	process.stderr.write("qs-doc: cannot find `qs` or `quickshell` on PATH\n");
	process.exit(1);
}

const url = wantList
	? `https://quickshell.org/docs/v${version}/types`
	: (() => {
			// Type path: "PanelWindow" -> "Quickshell/PanelWindow",
			// "Quickshell.Services.Pipewire.Pipewire" -> "Quickshell/Services/Pipewire/Pipewire"
			const path = type.includes("/")
				? type
				: type.startsWith("Quickshell")
					? type.replace(/\./g, "/")
					: `Quickshell/${type.replace(/\./g, "/")}`;
			return `https://quickshell.org/docs/v${version}/types/${path}`;
		})();

if (wantOpen) {
	if (!openUrl(url)) {
		process.stderr.write(`qs-doc: could not open browser; URL: ${url}\n`);
		process.exit(1);
	}
	process.stdout.write(`${url}\n`);
	process.exit(0);
}

if (wantPrint) {
	process.stdout.write(`${url}\n`);
	process.exit(0);
}