// Build script for @fmode/wechat-cli.
//
// Bundles src/index.ts + src/commands/*.ts into a single self-contained
// dist/wecli.js with a node shebang. The tgz/zip this plugin gets copied
// into only needs that one file to be executable via `node dist/wecli.js`
// or (once `npm link`ed) via plain `wecli`.
//
// Intentionally zero runtime deps — this CLI uses Node 20+ globals
// (fetch, util.parseArgs, fs/promises, os, path) only, so the bundle is
// tiny and has no cross-platform native binding quirks.

import { build } from "esbuild";
import { readFileSync, rmSync, mkdirSync, existsSync, chmodSync } from "node:fs";
import { fileURLToPath } from "node:url";
import { dirname, resolve } from "node:path";

const __dirname = dirname(fileURLToPath(import.meta.url));
const projectRoot = resolve(__dirname, "..");

const pkg = JSON.parse(
  readFileSync(resolve(projectRoot, "package.json"), "utf8")
);

const outfile = resolve(projectRoot, "dist", "wecli.js");
const distDir = resolve(projectRoot, "dist");

if (existsSync(distDir)) {
  rmSync(distDir, { recursive: true, force: true });
}
mkdirSync(distDir, { recursive: true });

const result = await build({
  entryPoints: [resolve(projectRoot, "src", "index.ts")],
  outfile,
  bundle: true,
  format: "esm",
  platform: "node",
  target: "node20",
  sourcemap: "inline",
  legalComments: "none",
  minify: false,
  keepNames: true,
  external: ["node:*"],
  mainFields: ["module", "main"],
  conditions: ["import", "node", "default"],
  logLevel: "info",
  metafile: true,
  treeShaking: true,
  banner: {
    // Shebang first so `chmod +x dist/wecli.js && ./dist/wecli.js` works on
    // Unix. On Windows the shebang is harmless; `npm link` writes its own
    // `.cmd` shim regardless.
    js: `#!/usr/bin/env node\n// @fmode/wechat-cli v${pkg.version} — generated by scripts/build.mjs. Do not edit by hand.`,
  },
});

// Make the built file executable on POSIX. No-op on Windows (chmod succeeds
// silently; the bit is irrelevant because Windows ignores it).
try {
  chmodSync(outfile, 0o755);
} catch {
  /* best-effort */
}

const inputCount = Object.keys(result.metafile.inputs).length;
const bundled = readFileSync(outfile, "utf8");
const outputSize = bundled.length;
console.log(
  `\n\u2705 bundled ${inputCount} modules -> dist/wecli.js (${(outputSize / 1024).toFixed(1)} KiB)`
);
console.log(
  `   Run with:  node dist/wecli.js --help   (or \`npm link\` + \`wecli --help\`)`
);