#!/usr/bin/env tsx
import { serveStdio } from "@modelcontextprotocol/server/stdio";
import { resolveSourceSpec } from "./sources";
import { createServer } from "./server";
import { SourceRegistry } from "./sourceRegistry";

// One registry for the process. It holds no active source and writes nothing:
// each call resolves its own `source` handle, and a call that omits one reads
// the startup spec below. The instance cache lives here so per-call selection
// stays cheap.
//
// serveStdio owns the era decision for the connection: the opening exchange
// selects `modern` (2026-07-28) or `legacy` (the 2025 initialize handshake),
// then pins ONE instance from this factory for the connection's lifetime. It
// also builds — and discards — one extra instance for a `server/discover`
// probe, so expect up to two `era:` lines per client. That log is how we learn
// which era a given client actually negotiates.
function main(): void {
  const registry = new SourceRegistry(resolveSourceSpec(process.argv.slice(2)));
  console.error(
    `[yt-dlp-transcript-mcp] default corpus: ${registry.defaultHandle}`,
  );
  serveStdio(({ era }) => {
    console.error(`[yt-dlp-transcript-mcp] serving protocol era: ${era}`);
    return createServer(registry);
  });
  console.error("[yt-dlp-transcript-mcp] ready on stdio");
}

main();