#!/usr/bin/env node
// momme.world site generator.
//
// commands/*.md is the single source of content. Each file describes one
// command: front matter sets metadata, the body is what it prints.
//
//   filename         -> command name (underscores become spaces)
//   name:            -> overrides the filename-derived name
//   help:            -> one-liner for the help listing
//   params:          -> argument placeholder shown in help (e.g. "<text>")
//   prefix: true     -> command accepts anything after its name
//   suggestion: true -> chip button under the terminal + tailnet MOTD hint
//   hidden: true     -> works, but stays out of help
//   text: true       -> included in the plain-text page (curl)
//   ${args} ${date} ${time} ${ls} ${help} -> resolved when the command runs
//
// Output goes to k8s/site/ and is COMMITTED: ArgoCD serves those files
// straight from the repo, so `npm run build` is part of editing the site.

import { readFileSync, writeFileSync, readdirSync, mkdirSync } from "node:fs";
import { join } from "node:path";
import { execSync } from "node:child_process";

const root = new URL("..", import.meta.url).pathname.replace(/^\/([A-Za-z]:)/, "$1");
const P = (p) => join(root, p);

// ---------- read commands ----------
const read = (file) => {
  const raw = readFileSync(P("commands/" + file), "utf8").replace(/\r\n/g, "\n");
  const m = raw.match(/^---\n([\s\S]*?)\n---\n\n?([\s\S]*)$/);
  if (!m) throw new Error(`${file}: missing or malformed front matter`);
  const meta = {};
  for (const line of m[1].split("\n")) {
    const [key, ...rest] = line.split(":");
    if (key) meta[key.trim()] = rest.join(":").trim().replace(/^["']|["']$/g, "");
  }
  const name = meta.name || file.replace(/\.md$/, "").replace(/_/g, " ");
  return {
    name,
    help: meta.help ?? "",
    params: meta.params ?? "",
    prefix: meta.prefix === "true",
    suggestion: meta.suggestion === "true",
    hidden: meta.hidden === "true",
    text: meta.text === "true",
    body: m[2].trimEnd(),
  };
};

const files = readdirSync(P("commands")).filter((f) => f.endsWith(".md")).sort();
const commands = files.map(read);

for (const c of commands) {
  for (const other of commands) {
    if (other !== c && other.name === c.name) throw new Error(`duplicate command name: ${c.name}`);
  }
}
if (new Set(commands.map((c) => c.name.split(" ")[0])).size !== new Set(commands.filter((c) => !c.name.includes(" ")).map((c) => c.name)).size) {
  // multi-word commands ("project x") must not collide with first words
  const firsts = new Set(commands.filter((c) => !c.name.includes(" ")).map((c) => c.name));
  for (const c of commands.filter((c) => c.name.includes(" "))) {
    if (firsts.has(c.name.split(" ")[0])) throw new Error(`name collision: ${c.name} vs ${c.name.split(" ")[0]}`);
  }
}

// ---------- index.html ----------
const chips = commands
  .filter((c) => c.suggestion && !c.hidden)
  .map((c) => `    <button data-run="${c.name}" class="rounded border border-line bg-panel px-3 py-1 text-xs text-dim hover:text-accent hover:border-accent transition-colors">${c.name}</button>`)
  .join("\n");

const banner = readFileSync(P("templates/banner.txt"), "utf8").replace(/\s+$/, "");
const template = readFileSync(P("src/index.html"), "utf8");
for (const [ph, val] of [["<!--@chips-->", chips], ["<!--@banner-->", banner]]) {
  if (!template.includes(ph)) throw new Error(`src/index.html: ${ph} placeholder missing`);
}
writeFileSync(
  P("k8s/site/index.html"),
  template.replace("<!--@chips-->", chips).replace("<!--@banner-->", banner)
);

// ---------- commands.json (web runtime + telnet both read this) ----------
const json = JSON.stringify({ banner, commands }, null, 1) + "\n";
writeFileSync(P("k8s/site/commands.json"), json);

// ---------- hello.txt (what curl sees) ----------
const sections = commands
  .filter((c) => c.text)
  .map((c) => {
    const body = c.body.replace(/\$\{help\}|\$\{ls\}/g, "");
    return `${c.name}\n${"=".repeat(c.name.length)}\n${body}`.trimEnd();
  });
writeFileSync(
  P("k8s/site/hello.txt"),
  banner + "\n\n" + sections.join("\n\n") + "\n\nThe interactive version of this page is at https://momme.world/\n"
);

// ---------- copy runtimes ----------
writeFileSync(P("k8s/site/site.js"), readFileSync(P("src/site.js"), "utf8"));
writeFileSync(P("k8s/site/telnet.py"), readFileSync(P("src/telnet.py"), "utf8"));

// ---------- tailwind ----------
try {
  execSync("npx --yes @tailwindcss/cli@4 -i src/input.css -o k8s/site/style.css --minify", { cwd: root, stdio: "inherit" });
} catch {
  console.error("tailwind build failed — is npm install done? (style.css stays as it was)");
  process.exit(1);
}

const words = (n) => String(n).padStart(2);
console.log(`built ${words(files.length)} commands -> k8s/site/  (${chips ? commands.filter((c) => c.suggestion).length + " chips" : "no chips"})`);