#!/usr/bin/env node
// Usage:
//   node packages/control-board/src/cli.mjs scan  [--config PATH] [--repo PATH] [--fleet PATH|none] [--liveness tmux|assume-alive] [--print]
//   node packages/control-board/src/cli.mjs serve [same flags] [--port N] [--host 127.0.0.1]
// Exit 0 on success, 2 on a config refusal or bad usage.
import { join } from "node:path";
import { homedir } from "node:os";
import { loadConfig, defaultConfigPath, discoverRepoAgents, discoverFleetAgents, scan, tmuxInspect, ConfigError } from "./scan.mjs";
import { startServer } from "./serve.mjs";

const USAGE = "usage: mosaic-board scan|serve [--config PATH] [--repo PATH] [--fleet PATH|none] [--liveness tmux|assume-alive] [--print] [--port N] [--host 127.0.0.1]";

function parseArgs(argv) {
  const opts = { command: argv[0], config: defaultConfigPath(), repo: process.cwd(), fleet: join(homedir(), ".mosaic", "fleet", "agents"), liveness: "tmux", print: false, port: 7331, host: "127.0.0.1" };
  for (let i = 1; i < argv.length; i++) {
    const a = argv[i];
    const next = () => {
      if (i + 1 >= argv.length) throw new ConfigError(`missing value for ${a}`);
      return argv[++i];
    };
    if (a === "--config") opts.config = next();
    else if (a === "--repo") opts.repo = next();
    else if (a === "--fleet") opts.fleet = next();
    else if (a === "--liveness") opts.liveness = next();
    else if (a === "--print") opts.print = true;
    else if (a === "--port") {
      opts.port = Number(next());
      if (!Number.isInteger(opts.port) || opts.port < 0 || opts.port > 65535) throw new ConfigError("--port must be an integer 0..65535");
    } else if (a === "--host") opts.host = next();
    else throw new ConfigError(`unknown argument: ${a}`);
  }
  if (opts.command !== "scan" && opts.command !== "serve") throw new ConfigError(USAGE);
  if (!["tmux", "assume-alive"].includes(opts.liveness)) throw new ConfigError(`unknown liveness mode: ${opts.liveness}`);
  return opts;
}

async function main() {
  const opts = parseArgs(process.argv.slice(2));
  const { dataRoot } = loadConfig(opts.config);
  const specs = [...discoverRepoAgents(opts.repo), ...(opts.fleet === "none" ? [] : discoverFleetAgents(opts.fleet))];
  const isAlive = opts.liveness === "tmux" ? tmuxInspect : () => true;
  const boardDir = join(dataRoot, "board");
  const seatsDir = join(dataRoot, "seats");
  if (opts.command === "serve") {
    const server = await startServer({ host: opts.host, port: opts.port, specs, boardDir, isAlive, seatsDir, discordDataRoot: dataRoot });
    const addr = server.address();
    process.stdout.write(`control board: http://${opts.host}:${addr.port}/  (${specs.length} agents; board files in ${boardDir}; Ctrl-C to stop)\n`);
    const stop = () => server.close(() => process.exit(0));
    process.on("SIGINT", stop);
    process.on("SIGTERM", stop);
    return;
  }
  const index = scan(specs, { boardDir, isAlive, seatsDir, discordDataRoot: dataRoot });
  for (const line of index.discoveryErrors) process.stderr.write(`${line}\n`);
  for (const line of index.registrationErrors) process.stderr.write(`registration skipped: ${line}\n`);
  if (opts.print) {
    for (const s of index.sessions) {
      const flag = s.waitingOnYou ? "*" : s.seen ? "s" : " ";
      const age = s.relaunchedAt ? "relaunch" : s.ageSeconds == null ? "-" : `${Math.round(s.ageSeconds / 60)}m`;
      const preview = s.relaunchedAt ? `relaunched at ${s.relaunchedAt}, no messages since` : s.lastAssistantText ? s.lastAssistantText.slice(0, 80) : "";
      process.stdout.write(`${flag} ${s.state.padEnd(8)} ${s.project.padEnd(14)} ${s.agent.padEnd(16)} ${age.padStart(7)}  ${preview}\n`);
    }
  }
  process.stdout.write(`board: ${boardDir} (${index.sessions.length} sessions, ${index.waitingOnYou.length} waiting on you, ${index.seen.length} seen, ${index.registered.length} registered, ${index.registrationStale.length} stale)\n`);
}

main().catch((err) => {
  if (err instanceof ConfigError) {
    process.stderr.write(`refused: ${err.message}\n`);
    process.exit(2);
  }
  throw err;
});