#!/usr/bin/env node

import { execFileSync, spawn as nodeSpawn } from "node:child_process";
import path from "node:path";
import { pathToFileURL } from "node:url";
import {
  evaluateClawHubTestboxClaim,
  evaluateLocalTestboxKey,
  resolveTestboxId,
  writeClawHubTestboxClaim,
} from "./blacksmith-testbox-state.mjs";

function git(args, cwd) {
  return execFileSync("git", args, { cwd, encoding: "utf8" });
}

export function splitRunnerArgs(argv = []) {
  const normalizedArgv = stripPackageManagerSeparator(argv);
  const separatorIndex = normalizedArgv.indexOf("--");
  if (separatorIndex === -1) {
    return { runnerArgs: normalizedArgv, commandArgs: [] };
  }
  return {
    runnerArgs: normalizedArgv.slice(0, separatorIndex),
    commandArgs: normalizedArgv.slice(separatorIndex + 1),
  };
}

function stripPackageManagerSeparator(argv) {
  if (argv[0] === "--") return argv.slice(1);
  const separatorIndex = argv.indexOf("--");
  const next = argv[separatorIndex + 1];
  if (
    separatorIndex > 0 &&
    (next === "--id" ||
      next === "--testbox-id" ||
      next?.startsWith("--id=") ||
      next?.startsWith("--testbox-id="))
  ) {
    return [...argv.slice(0, separatorIndex), ...argv.slice(separatorIndex + 1)];
  }
  return argv;
}

export function buildBlacksmithRunArgs({ commandArgs, testboxId }) {
  const command = commandArgs.join(" ").trim();
  if (!command) return [];
  return ["testbox", "run", "--id", testboxId, command];
}

export function resolveTestboxSyncTimeoutMs(env = process.env) {
  const raw = env.CLAWHUB_TESTBOX_SYNC_TIMEOUT_MS;
  if (raw === undefined || raw === "") return 5 * 60 * 1000;
  const parsed = Number(raw);
  return Number.isFinite(parsed) && parsed >= 0 ? parsed : 5 * 60 * 1000;
}

function hasClaimFlag(runnerArgs) {
  return runnerArgs.includes("--claim") || runnerArgs.includes("--claim-fresh");
}

function stripRunnerOnlyFlags(runnerArgs) {
  return runnerArgs.filter((arg) => arg !== "--claim" && arg !== "--claim-fresh");
}

function pipeChunk(stream, chunk) {
  if (chunk) stream.write(chunk);
}

function runBlacksmithWithSyncGuard({ args, cwd, env, spawn, stderr, stdout, syncTimeoutMs }) {
  return new Promise((resolve) => {
    const child = spawn("blacksmith", args, {
      cwd,
      env,
      stdio: ["inherit", "pipe", "pipe"],
    });
    let settled = false;
    let syncingSince = 0;
    let timedOut = false;
    let timer;

    const finish = (code) => {
      if (settled) return;
      settled = true;
      clearInterval(timer);
      resolve(timedOut ? 124 : typeof code === "number" ? code : 1);
    };

    const handleOutput = (stream, chunk) => {
      const text = String(chunk);
      pipeChunk(stream, chunk);
      if (text.includes("Syncing...")) {
        syncingSince ||= Date.now();
      } else if (syncingSince && /\b(running|executing|command|pnpm|npm|yarn|bun)\b/iu.test(text)) {
        syncingSince = 0;
      }
    };

    child.stdout?.on("data", (chunk) => handleOutput(stdout, chunk));
    child.stderr?.on("data", (chunk) => handleOutput(stderr, chunk));
    child.on("error", (error) => {
      stderr.write(`Failed to start blacksmith: ${error.message}\n`);
      finish(1);
    });
    child.on("close", (code) => finish(code));

    timer = setInterval(
      () => {
        if (!syncingSince || syncTimeoutMs <= 0) return;
        if (Date.now() - syncingSince < syncTimeoutMs) return;
        stderr.write(
          `Blacksmith Testbox sync produced no post-sync output for ${syncTimeoutMs}ms; terminating local runner. ` +
            "Rerun with CLAWHUB_TESTBOX_SYNC_TIMEOUT_MS=0 to disable this guard.\n",
        );
        timedOut = true;
        syncingSince = 0;
        child.kill?.("SIGTERM");
      },
      Math.min(Math.max(syncTimeoutMs, 1), 1000),
    );
  });
}

export async function runBlacksmithTestboxRunner({
  argv = process.argv.slice(2),
  cwd = process.cwd(),
  env = process.env,
  spawn = nodeSpawn,
  stderr = process.stderr,
  stdout = process.stdout,
} = {}) {
  const { runnerArgs, commandArgs } = splitRunnerArgs(argv);
  const shouldClaim = hasClaimFlag(runnerArgs);
  const testboxId = resolveTestboxId({ argv: stripRunnerOnlyFlags(runnerArgs), env });
  if (!testboxId) {
    stderr.write(
      "Missing Testbox id. Pass `--id <tbx_id>` or set CLAWHUB_TESTBOX_ID from this session's warmup output.\n",
    );
    return 2;
  }

  const keyResult = evaluateLocalTestboxKey({ env, testboxId });
  if (!keyResult.ok) {
    stderr.write(`${keyResult.problems.join("\n")}\n`);
    stderr.write(
      "Refusing to reuse a remote-visible Testbox without the local private key. Run:\n" +
        "  blacksmith testbox warmup ci-check-testbox.yml --ref main --idle-timeout 90\n",
    );
    return 2;
  }

  const root = git(["rev-parse", "--show-toplevel"], cwd).trim();
  if (path.resolve(cwd) !== path.resolve(root)) {
    stderr.write(
      `Refusing to run Testbox sync from ${cwd}; run from repo root ${root} so rsync does not mirror a subdirectory.\n`,
    );
    return 2;
  }

  if (shouldClaim) {
    const claim = writeClawHubTestboxClaim({ cwd: root, env, testboxId });
    stdout.write(`ClawHub Testbox claim written: ${testboxId} -> ${claim.claimPath}\n`);
  } else {
    const claimResult = evaluateClawHubTestboxClaim({ cwd: root, env, testboxId });
    if (!claimResult.ok) {
      stderr.write(`${claimResult.problems.join("\n")}\n`);
      stderr.write(
        "Refusing to run a Testbox that was not claimed by this ClawHub checkout. Run:\n" +
          "  blacksmith testbox warmup ci-check-testbox.yml --ref main --idle-timeout 90\n" +
          "  bun run testbox:claim -- --id <new_tbx_id>\n",
      );
      return 2;
    }
  }

  const blacksmithArgs = buildBlacksmithRunArgs({ commandArgs, testboxId });
  if (blacksmithArgs.length === 0) {
    stdout.write(`Testbox local key and ClawHub claim ok: ${testboxId}\n`);
    return 0;
  }

  return await runBlacksmithWithSyncGuard({
    args: blacksmithArgs,
    cwd,
    env,
    spawn,
    stderr,
    stdout,
    syncTimeoutMs: resolveTestboxSyncTimeoutMs(env),
  });
}

if (import.meta.url === pathToFileURL(process.argv[1] ?? "").href) {
  process.exitCode = await runBlacksmithTestboxRunner();
}