import { fileURLToPath, pathToFileURL } from 'node:url'
import { Context } from 'cordis'
import Loader from '@cordisjs/plugin-loader'

// Snapshot-test modes (set by the snapshot harness via env):
//   DSH_SNAPSHOT=replay  — load cordis.snapshot.yml (providerless; llm-replay
//                          serves a recorded session log). Skip .env so a stray
//                          key can never trigger a live model call.
//   DSH_SNAPSHOT=record  — load the normal cordis.yml (the real llm-deepseek
//                          adapter + persistence) so a real run can be harvested
//                          (the persistence root is redirected by env).
// Absent — the normal demo (cordis.yml), driven by a real editor.
const snapshotMode = process.env.DSH_SNAPSHOT
const configPath = snapshotMode === 'replay' ? './cordis.snapshot.yml' : './cordis.yml'

// Load DEEPSEEK_API_KEY / DEEPSEEK_BASE_URL from a gitignored repo-root .env
// (Node native). Absent file is fine — the environment may already carry them.
// In REPLAY mode we deliberately skip this: replay must never reach the network,
// so we don't want a present .env to enable a live call.
//
// IMPORTANT: this server speaks ACP JSON-RPC on stdout. Do NOT add any
// stdout logging here or in cordis.yml — it would corrupt the protocol frames.
// A present-but-unreadable/malformed .env is a real misconfiguration: surface
// it on STDERR (never stdout) rather than silently running with the wrong env.
if (snapshotMode !== 'replay') {
  try {
    process.loadEnvFile(new URL('../../.env', import.meta.url).pathname)
  } catch (error) {
    if ((error as NodeJS.ErrnoException | null)?.code !== 'ENOENT') {
      process.stderr.write(`acp-agent: failed to load .env: ${String(error)}\n`)
    }
    // ENOENT (no .env) is fine — rely on the ambient environment.
  }
}

// Resolve relative cordis.yml paths from the repo root no matter where the
// editor launches this demo command.
process.chdir(fileURLToPath(new URL('../..', import.meta.url)))

const ctx = new Context()
ctx.baseUrl = pathToFileURL(import.meta.dirname).href + '/'

await ctx.plugin(Loader)
await ctx.loader.create({
  name: '@cordisjs/plugin-include',
  config: {
    path: configPath,
  },
})

// Graceful shutdown for snapshot runs (both replay and record): when the client
// closes our stdin (it is done driving the session), dispose the whole context.
// Disposal awaits the agent-loop teardown and the persistence backend's final
// `session/flush`, so the session `.jsonl` is fully written before the process
// exits and the harness harvests it (and the subprocess exits cleanly so the
// harness's waitForExit resolves). (In a normal editor session stdin stays open
// for the connection's lifetime; the editor kills the process, so this never
// fires.)
if (snapshotMode !== undefined) {
  process.stdin.on('end', () => {
    void ctx.fiber.dispose().then(() => { process.exit(0) })
  })
}