import { dirname, basename } from "path";
import { existsSync, writeFileSync, mkdirSync } from "fs";
import { createHash } from "crypto";
import { DEUK_ROOT_DIR, CliOpts, buildWorkspaceAliases, hasWorkspaceMarker, makePath, normalizeRegistryPath, resolveUserHome, writeFileLF } from "./cli-utils.js";

// ─── 내부 헬퍼: 워크스페이스 레지스트리 ─────────────────────────────────
function hashPath(value) {
  return createHash("sha256").update(normalizeRegistryPath(String(value || "")), "utf8").digest("hex");
}

function workspaceRegistryRoot(homeDir = resolveUserHome()) {
  return makePath(homeDir, ".agent-flow", "workspace");
}

function safeRegistryFileName(name) {
  const cleaned = String(name || "workspace")
    .replace(/[^A-Za-z0-9._-]+/g, "-")
    .replace(/^-+|-+$/g, "");
  return `${cleaned || "workspace"}.json`;
}

// ─── 공개 API ─────────────────────────────────────────────────────────────

export function updateSiblingWorkspaceRegistry(cwd, opts: CliOpts = {}) {
  const workspacePath = normalizeRegistryPath(cwd || "");
  if (!hasWorkspaceMarker(workspacePath)) return false;

  const homeDir = resolveUserHome(opts);
  // #623: never register the user home or anything under ~/.deuk-agent as a
  // workspace — that store holds relocated tickets, not a sibling workspace, and
  // registering it makes ticket ids look ambiguous across "workspaces".
  const homeNorm = normalizeRegistryPath(homeDir);
  const storeNorm = normalizeRegistryPath(makePath(homeDir, DEUK_ROOT_DIR));
  if (workspacePath === homeNorm
    || workspacePath === storeNorm
    || workspacePath.startsWith(storeNorm + "/")) {
    return false;
  }
  const dryRun = Boolean(opts.dryRun);
  const parentRoot = dirname(workspacePath);
  const workspaceName = basename(workspacePath);
  const parentRootHash = hashPath(parentRoot);
  const pathHash = hashPath(workspacePath);
  const registryDir = makePath(workspaceRegistryRoot(homeDir), parentRootHash);
  const registryPath = makePath(registryDir, safeRegistryFileName(workspaceName));
  const payload = {
    version: 1,
    name: workspaceName,
    path: workspacePath,
    aliases: buildWorkspaceAliases(workspaceName, workspacePath),
    parentRoot,
    parentRootHash,
    pathHash,
    updatedAt: new Date().toISOString(),
  };

  if (!dryRun) {
    mkdirSync(registryDir, { recursive: true });
    writeFileLF(registryPath, JSON.stringify(payload, null, 2) + "\n");
  }
  return { registryPath, payload };
}