#!/usr/bin/env node
// Unified entry point for the Hanzo Dev CLI.

import path from "path";
import { fileURLToPath } from "url";
import { platform as nodePlatform, arch as nodeArch } from "os";
import { execSync } from "child_process";
import { get as httpsGet } from "https";
import { runPostinstall } from "../postinstall.js";

// __dirname equivalent in ESM
const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

const { platform, arch } = process;

function isWSL() {
  if (platform !== "linux") return false;
  try {
    const txt = readFileSync("/proc/version", "utf8").toLowerCase();
    return txt.includes("microsoft");
  } catch {
    return false;
  }
}

let targetTriple = null;
switch (platform) {
  case "linux":
  case "android":
    switch (arch) {
      case "x64":
        targetTriple = "x86_64-unknown-linux-musl";
        break;
      case "arm64":
        targetTriple = "aarch64-unknown-linux-musl";
        break;
      default:
        break;
    }
    break;
  case "darwin":
    switch (arch) {
      case "x64":
        targetTriple = "x86_64-apple-darwin";
        break;
      case "arm64":
        targetTriple = "aarch64-apple-darwin";
        break;
      default:
        break;
    }
    break;
  case "win32":
    switch (arch) {
      case "x64":
        targetTriple = "x86_64-pc-windows-msvc.exe";
        break;
      case "arm64":
        // We do not build this today, fall through...
      default:
        break;
    }
    break;
  default:
    break;
}

if (!targetTriple) {
  throw new Error(`Unsupported platform: ${platform} (${arch})`);
}

// Binary names for Hanzo dev
let binaryPath = path.join(__dirname, "..", "bin", `dev-${targetTriple}`);
let legacyBinaryPath = path.join(__dirname, "..", "bin", `dev-${targetTriple}`);

import { existsSync, chmodSync, statSync, openSync, readSync, closeSync, mkdirSync, copyFileSync, readFileSync, unlinkSync, createWriteStream } from "fs";

const validateBinary = (p) => {
  try {
    const st = statSync(p);
    if (!st.isFile() || st.size === 0) {
      return { ok: false, reason: "empty or not a regular file" };
    }
    const fd = openSync(p, "r");
    try {
      const buf = Buffer.alloc(4);
      const n = readSync(fd, buf, 0, 4, 0);
      if (n < 2) return { ok: false, reason: "too short" };
      if (platform === "win32") {
        if (!(buf[0] === 0x4d && buf[1] === 0x5a)) return { ok: false, reason: "invalid PE header (missing MZ)" };
      } else if (platform === "linux" || platform === "android") {
        if (!(buf[0] === 0x7f && buf[1] === 0x45 && buf[2] === 0x4c && buf[3] === 0x46)) return { ok: false, reason: "invalid ELF header" };
      } else if (platform === "darwin") {
        const isMachO = (buf[0] === 0xcf && buf[1] === 0xfa && buf[2] === 0xed && buf[3] === 0xfe) ||
                        (buf[0] === 0xca && buf[1] === 0xfe && buf[2] === 0xba && buf[3] === 0xbe);
        if (!isMachO) return { ok: false, reason: "invalid Mach-O header" };
      }
    } finally {
      closeSync(fd);
    }
    return { ok: true };
  } catch (e) {
    return { ok: false, reason: e.message };
  }
};

const getCacheDir = (version) => {
  const plt = nodePlatform();
  const home = process.env.HOME || process.env.USERPROFILE || "";
  let base = "";
  if (plt === "win32") {
    base = process.env.LOCALAPPDATA || path.join(home, "AppData", "Local");
  } else if (plt === "darwin") {
    base = path.join(home, "Library", "Caches");
  } else {
    base = process.env.XDG_CACHE_HOME || path.join(home, ".cache");
  }
  const dir = path.join(base, "hanzo", "dev", version);
  if (!existsSync(dir)) mkdirSync(dir, { recursive: true });
  return dir;
};

const getCachedBinaryPath = (version) => {
  const cacheDir = getCacheDir(version);
  return path.join(cacheDir, `dev-${targetTriple}`);
};

let lastBootstrapError = null;

const httpsDownload = (url, dest) => new Promise((resolve, reject) => {
  const req = httpsGet(url, (res) => {
    const status = res.statusCode || 0;
    if (status >= 300 && status < 400 && res.headers.location) {
      return resolve(httpsDownload(res.headers.location, dest));
    }
    if (status !== 200) {
      return reject(new Error(`HTTP ${status}`));
    }
    const out = createWriteStream(dest);
    res.pipe(out);
    out.on("finish", () => out.close(resolve));
    out.on("error", (e) => {
      try { unlinkSync(dest); } catch {}
      reject(e);
    });
  });
  req.on("error", (e) => {
    try { unlinkSync(dest); } catch {}
    reject(e);
  });
  req.setTimeout(120000, () => {
    req.destroy(new Error("download timed out"));
  });
});

const tryBootstrapBinary = async () => {
  try {
    const pkg = JSON.parse(readFileSync(path.join(__dirname, "..", "package.json"), "utf8"));
    const version = pkg.version;

    const binDir = path.join(__dirname, "..", "bin");
    if (!existsSync(binDir)) mkdirSync(binDir, { recursive: true });

    // Fast path: user cache
    const cachePath = getCachedBinaryPath(version);
    if (existsSync(cachePath)) {
      const v = validateBinary(cachePath);
      if (v.ok) {
        if (platform !== "win32") {
          copyFileSync(cachePath, binaryPath);
          try { chmodSync(binaryPath, 0o755); } catch {}
        }
        return true;
      }
    }

    // Try platform package (if present)
    try {
      const req = (await import("module")).createRequire(import.meta.url);
      const name = (() => {
        if (platform === "win32") return "@hanzo/dev-win32-x64";
        const plt = nodePlatform();
        const cpu = nodeArch();
        if (plt === "darwin" && cpu === "arm64") return "@hanzo/dev-darwin-arm64";
        if (plt === "darwin" && cpu === "x64") return "@hanzo/dev-darwin-x64";
        if (plt === "linux" && cpu === "x64") return "@hanzo/dev-linux-x64-musl";
        if (plt === "linux" && cpu === "arm64") return "@hanzo/dev-linux-arm64-musl";
        return null;
      })();
      if (name) {
        try {
          const pkgJson = req.resolve(`${name}/package.json`);
          const pkgDir = path.dirname(pkgJson);
          const src = path.join(pkgDir, "bin", `dev-${targetTriple}`);
          if (existsSync(src)) {
            copyFileSync(src, cachePath);
            if (platform !== "win32") {
              copyFileSync(cachePath, binaryPath);
              try { chmodSync(binaryPath, 0o755); } catch {}
            }
            return true;
          }
        } catch { /* ignore and fall back */ }
      }
    } catch { /* ignore */ }

    // Download from GitHub release
    const isWin = platform === "win32";
    // Use 'dev-*' binary names matching the release artifacts
    const binaryName = `dev-${targetTriple}`;
    const archiveName = isWin
      ? `${binaryName}.zip`
      : (() => { try { execSync("zstd --version", { stdio: "ignore", shell: true }); return `${binaryName}.zst`; } catch { return `${binaryName}.tar.gz`; } })();
    const url = `https://github.com/hanzoai/dev/releases/download/v${version}/${archiveName}`;
    const tmp = path.join(binDir, `.${archiveName}.part`);
    return httpsDownload(url, tmp)
      .then(() => {
        if (isWin) {
          try {
            const sysRoot = process.env.SystemRoot || process.env.windir || 'C:\\Windows';
            const psFull = path.join(sysRoot, 'System32', 'WindowsPowerShell', 'v1.0', 'powershell.exe');
            const unzipDest = getCacheDir(version);
            const psCmd = `Expand-Archive -Path '${tmp}' -DestinationPath '${unzipDest}' -Force`;
            let ok = false;
            try { execSync(`"${psFull}" -NoProfile -NonInteractive -Command "${psCmd}"`, { stdio: 'ignore' }); ok = true; } catch {}
            if (!ok) { try { execSync(`powershell -NoProfile -NonInteractive -Command "${psCmd}"`, { stdio: 'ignore' }); ok = true; } catch {} }
            if (!ok) { try { execSync(`pwsh -NoProfile -NonInteractive -Command "${psCmd}"`, { stdio: 'ignore' }); ok = true; } catch {} }
            if (!ok) { execSync(`tar -xf "${tmp}" -C "${unzipDest}"`, { stdio: 'ignore', shell: true }); }
          } catch (e) {
            throw new Error(`failed to unzip: ${e.message}`);
          } finally { try { unlinkSync(tmp); } catch {} }
        } else {
          if (archiveName.endsWith(".zst")) {
            try { execSync(`zstd -d '${tmp}' -o '${binaryPath}'`, { stdio: 'ignore', shell: true }); }
            catch (e) { try { unlinkSync(tmp); } catch {}; throw new Error(`failed to decompress zst: ${e.message}`); }
            try { unlinkSync(tmp); } catch {}
          } else {
            try { execSync(`tar -xzf '${tmp}' -C '${binDir}'`, { stdio: 'ignore', shell: true }); }
            catch (e) { try { unlinkSync(tmp); } catch {}; throw new Error(`failed to extract tar.gz: ${e.message}`); }
            try { unlinkSync(tmp); } catch {}
          }
        }
        if (platform !== "win32") {
          try { copyFileSync(binaryPath, cachePath); } catch {}
        }

        const v = validateBinary(platform === "win32" ? cachePath : binaryPath);
        if (!v.ok) throw new Error(`invalid binary (${v.reason})`);
        if (platform !== "win32") try { chmodSync(binaryPath, 0o755); } catch {}
        return true;
      })
      .catch((e) => { lastBootstrapError = e; return false; });
  } catch {
    return false;
  }
};

// If missing, attempt to bootstrap into place
let binaryReady = existsSync(binaryPath) || existsSync(legacyBinaryPath);
if (!binaryReady) {
  let runtimePostinstallError = null;
  try {
    await runPostinstall({ invokedByRuntime: true, skipGlobalAlias: true });
  } catch (err) {
    runtimePostinstallError = err;
  }

  binaryReady = existsSync(binaryPath) || existsSync(legacyBinaryPath);
  if (!binaryReady) {
    const ok = await tryBootstrapBinary();
    if (!ok) {
      if (runtimePostinstallError && !lastBootstrapError) {
        lastBootstrapError = runtimePostinstallError;
      }
      if (existsSync(legacyBinaryPath) && !existsSync(binaryPath)) {
        binaryPath = legacyBinaryPath;
      }
    }
  }
}

// Prefer cached binary when available
try {
  const pkg = JSON.parse(readFileSync(path.join(__dirname, "..", "package.json"), "utf8"));
  const version = pkg.version;
  const cached = getCachedBinaryPath(version);
  const v = existsSync(cached) ? validateBinary(cached) : { ok: false };
  if (v.ok) {
    binaryPath = cached;
  } else if (!existsSync(binaryPath) && existsSync(legacyBinaryPath)) {
    binaryPath = legacyBinaryPath;
  }
} catch {
  // ignore
}

import { spawnSync } from "child_process";
if (existsSync(binaryPath)) {
  try {
    if (platform !== "win32") {
      chmodSync(binaryPath, 0o755);
    }
  } catch (e) {
    // Ignore permission errors
  }
} else {
  console.error(`Binary not found: ${binaryPath}`);
  if (lastBootstrapError) {
    const msg = (lastBootstrapError && (lastBootstrapError.message || String(lastBootstrapError))) || 'unknown bootstrap error';
    console.error(`Bootstrap error: ${msg}`);
  }
  console.error(`Please try reinstalling the package:`);
  console.error(`  npm uninstall -g @hanzo/dev`);
  console.error(`  npm install -g @hanzo/dev`);
  if (isWSL()) {
    console.error("Detected WSL. Install inside WSL (Ubuntu) separately:");
    console.error("  npx -y @hanzo/dev@latest  (run inside WSL)");
    console.error("If installed globally on Windows, those binaries are not usable from WSL.");
  }
  process.exit(1);
}

const validation = validateBinary(binaryPath);
if (!validation.ok) {
  console.error(`The native binary at ${binaryPath} appears invalid: ${validation.reason}`);
  console.error("This can happen if the download failed or was modified by antivirus/proxy.");
  console.error("Please try reinstalling:");
  console.error("  npm uninstall -g @hanzo/dev");
  console.error("  npm install -g @hanzo/dev");
  if (platform === "win32") {
    console.error("If the issue persists, clear npm cache and disable antivirus temporarily:");
    console.error("  npm cache clean --force");
  }
  if (isWSL()) {
    console.error("Detected WSL. Ensure you install/run inside WSL, not Windows:");
    console.error("  npx -y @hanzo/dev@latest  (inside WSL)");
  }
  process.exit(1);
}

// If running under npx/npm, emit a concise notice
try {
  const ua = process.env.npm_config_user_agent || "";
  const isNpx = ua.includes("npx");
  if (isNpx && process.stderr && process.stderr.isTTY) {
    console.error(`@hanzo/dev: running bundled binary -> ${binaryPath}`);
  }
} catch {}

const { spawn } = await import("child_process");

process.env.DEV_BINARY_PATH = binaryPath;

const child = spawn(binaryPath, process.argv.slice(2), {
  stdio: "inherit",
  env: { ...process.env, DEV_MANAGED_BY_NPM: "1", DEV_BINARY_PATH: binaryPath },
});

child.on("error", (err) => {
  const code = err && err.code;
  if (code === 'EACCES') {
    console.error(`Permission denied: ${binaryPath}`);
    console.error(`Try running: chmod +x "${binaryPath}"`);
    console.error(`Or reinstall the package with: npm install -g @hanzo/dev`);
  } else if (code === 'EFTYPE' || code === 'ENOEXEC') {
    console.error(`Failed to execute native binary: ${binaryPath}`);
    console.error("The file may be corrupt or of the wrong type. Reinstall usually fixes this:");
    console.error("  npm uninstall -g @hanzo/dev && npm install -g @hanzo/dev");
    if (platform === 'win32') {
      console.error("On Windows, ensure the .exe downloaded correctly (proxy/AV can interfere).");
      console.error("Try clearing cache: npm cache clean --force");
    }
    if (isWSL()) {
      console.error("Detected WSL. Windows binaries cannot be executed from WSL.");
      console.error("Install inside WSL and run there: npx -y @hanzo/dev@latest");
    }
  } else {
    console.error(err);
  }
  process.exit(1);
});

const forwardSignal = (signal) => {
  if (child.killed) {
    return;
  }
  try {
    child.kill(signal);
  } catch {
    /* ignore */
  }
};

["SIGINT", "SIGTERM", "SIGHUP"].forEach((sig) => {
  process.on(sig, () => forwardSignal(sig));
});

const childResult = await new Promise((resolve) => {
  child.on("exit", (code, signal) => {
    if (signal) {
      resolve({ type: "signal", signal });
    } else {
      resolve({ type: "code", exitCode: code ?? 1 });
    }
  });
});

if (childResult.type === "signal") {
  process.kill(process.pid, childResult.signal);
} else {
  process.exit(childResult.exitCode);
}