const { execSync } = require("child_process");
const fs = require("fs");
const os = require("os");
const path = require("path");

// Load .env.local from project root if present (persists NAS_SSH_TARGET etc.)
const envLocalPath = path.join(__dirname, "..", ".env.local");
if (fs.existsSync(envLocalPath)) {
  for (const line of fs.readFileSync(envLocalPath, "utf8").split("\n")) {
    const trimmed = line.trim();
    if (!trimmed || trimmed.startsWith("#")) continue;
    const idx = trimmed.indexOf("=");
    if (idx < 0) continue;
    const k = trimmed.slice(0, idx).trim();
    const v = trimmed.slice(idx + 1).trim();
    if (!(k in process.env)) process.env[k] = v;
  }
}

const isWin = process.platform === "win32";
const isMac = process.platform === "darwin";
const src = "dist";
const dstWin = "Z:\\docker\\webpage\\frontend\\";
const dstMac = "/Volumes/gahusb.synology.me/docker/webpage/frontend/";
const dst = isWin ? dstWin : dstMac;

if (!fs.existsSync(src)) {
  console.error("dist not found. Run build first.");
  process.exit(1);
}

if (isWin) {
  const cmd =
    'powershell -NoProfile -ExecutionPolicy Bypass -Command "$ErrorActionPreference=\\"Stop\\"; $src=\\"dist\\"; $dst=\\"Z:\\\\docker\\\\webpage\\\\frontend\\\\\\"; if(!(Test-Path $src)){ throw \\"dist not found. Run build first.\\" }; if(!(Test-Path $dst)){ throw \\"NAS drive not found. Check Z: mapping.\\" }; $log = Join-Path (Get-Location) \\"robocopy.log\\"; robocopy $src $dst /MIR /R:1 /W:1 /E /NFL /NDL /NP /V /TEE /LOG:$log; $rc = $LASTEXITCODE; if($rc -ge 8){ Write-Host \\"robocopy failed with code $rc. See $log\\"; exit $rc } else { exit 0 }"';
  execSync(cmd, { stdio: "inherit" });
} else if (isMac) {
  const sshTarget = process.env.NAS_SSH_TARGET;
  const sshPath =
    process.env.NAS_SSH_PATH || "/volume1/docker/webpage/frontend/";
  const sshPort = process.env.NAS_SSH_PORT;

  // SSH 경로: NAS_SSH_TARGET이 설정된 경우 항상 우선
  if (sshTarget) {
    // 제어문자·줄바꿈 제거 (잘못된 export/copy-paste 대비)
    const cleanTarget = sshTarget.replace(/[\r\n\t]/g, "").trim();
    const cleanPath = sshPath.replace(/[\r\n\t]/g, "").trim();
    const cleanPort = sshPort ? sshPort.replace(/\D/g, "").trim() : "";

    if (!cleanTarget) {
      console.error("NAS_SSH_TARGET 값이 비어있습니다. .env.local 또는 환경변수를 확인하세요.");
      printSshHint();
      process.exit(1);
    }
    if (cleanPort && !/^\d{1,5}$/.test(cleanPort)) {
      console.error(`NAS_SSH_PORT 값이 잘못됐습니다: "${sshPort}" → 숫자만 입력하세요.`);
      process.exit(1);
    }

    // macOS Keychain은 서브프로세스(rsync)에서 SSH 키를 자동 로드하지 못함 → -i 명시
    const keyFile = process.env.NAS_SSH_KEY || path.join(os.homedir(), ".ssh", "id_rsa");
    const portOpt = cleanPort ? `-p ${cleanPort}` : "";
    const sshCmd = `ssh ${portOpt} -i "${keyFile}" -o StrictHostKeyChecking=accept-new -o BatchMode=yes`.trim();

    console.log(`Deploying via SSH → ${cleanTarget}:${cleanPath}`);
    console.log(`SSH command: ${sshCmd}`);
    execSync(
      `rsync -r --delete --delete-delay -e "${sshCmd}" ${src}/ ${cleanTarget}:${cleanPath}`,
      { stdio: "inherit" }
    );
    process.exit(0);
  }

  // SMB 마운트 경로 fallback
  if (!fs.existsSync(dst)) {
    console.error("NAS path not found: " + dst);
    printSshHint();
    process.exit(1);
  }

  if (!dst.includes("docker/webpage/frontend")) {
    console.error("Safety check failed: unexpected dst path: " + dst);
    process.exit(1);
  }

  try {
    const testPath = `${dst}.deploy-write-test`;
    fs.writeFileSync(testPath, "ok");
    fs.unlinkSync(testPath);
  } catch (err) {
    console.error("NAS write test failed (EIO / permission error).");
    console.error(
      "macOS SMB → Synology 쓰기 실패는 흔한 이슈입니다. SSH 배포를 사용하세요.\n"
    );
    printSshHint();
    process.exit(1);
  }

  const sleep = (ms) =>
    Atomics.wait(new Int32Array(new SharedArrayBuffer(4)), 0, 0, ms);
  const retry = (fn, attempts = 6) => {
    for (let i = 0; i < attempts; i += 1) {
      try {
        fn();
        return;
      } catch (err) {
        if (i === attempts - 1) throw err;
        sleep(150);
      }
    }
  };
  const removeTree = (target) => {
    const stat = fs.lstatSync(target);
    if (stat.isDirectory()) {
      retry(() => {
        const entries = fs.readdirSync(target);
        for (const entry of entries) {
          removeTree(`${target}/${entry}`);
        }
      });
      retry(() => fs.rmdirSync(target));
    } else {
      retry(() => fs.unlinkSync(target));
    }
  };
  if (process.env.NAS_CLEAN === "1") {
    try {
      const entries = fs.readdirSync(dst);
      for (const entry of entries) {
        removeTree(`${dst}${entry}`);
      }
    } catch (err) {
      console.warn("Clean skipped due to NAS lock:", err?.message ?? err);
    }
  }
  execSync(`ditto ${src} ${dst}`, { stdio: "inherit" });
} else {
  const baseArgs = ["rsync", "-r", "--delete", "--delete-delay", "-t"];
  const cmd = `${baseArgs.join(" ")} ${src}/ ${dst}`;
  execSync(cmd, { stdio: "inherit" });
}

function printSshHint() {
  console.error("──────────────────────────────────────────────────");
  console.error("SSH 배포 설정 방법:");
  console.error("  프로젝트 루트에 .env.local 파일을 만들고 아래 내용을 입력하세요:");
  console.error("");
  console.error("  NAS_SSH_TARGET=<NAS_유저명>@gahusb.synology.me");
  console.error("  NAS_SSH_PORT=<SSH_포트>          # 기본 22, DSM에서 확인");
  console.error("");
  console.error("  이후 npm run release:nas 를 다시 실행하면 rsync over SSH로 배포됩니다.");
  console.error("──────────────────────────────────────────────────");
}