from dataclasses import dataclass
from typing import List, Optional
from pathlib import Path
import json

@dataclass
class Bead:
 id: str
 title: str
 description: str
 status: str = "active"

class BeadsClient:
 def __init__(self, working_dir: Path):
  self.working_dir = Path(working_dir)
  self.repo_dir = self.working_dir / ".beads_mock"
  self.beads_file = self.repo_dir / "beads.json"

 def init_repo(self) -> None:
  """Initialize the mock repository."""
  self.repo_dir.mkdir(parents=True, exist_ok=True)
  if not self.beads_file.exists():
   self.beads_file.write_text("[]", encoding="utf-8")

 def is_initialized(self) -> bool:
  """Check if the repository is initialized."""
  return self.beads_file.exists()

 def create_bead(self, title: str, description: str) -> str:
  """Create a new bead and return its ID."""
  beads = self._read_beads()
  bead_id = f"bead-{len(beads) + 1}"
  bead = {"id": bead_id, "title": title, "description": description, "status": "active"}
  beads.append(bead)
  self._write_beads(beads)
  return bead_id

 def update_bead(self, bead_id: str, status: str) -> bool:
  """Update the status of an existing bead."""
  beads = self._read_beads()
  for bead in beads:
   if bead["id"] == bead_id:
    bead["status"] = status
    self._write_beads(beads)
    return True
  return False

 def list_beads(self) -> List[Bead]:
  """List all beads."""
  return [Bead(**b) for b in self._read_beads()]

 def _read_beads(self) -> List[dict]:
  if not self.beads_file.exists():
   return []
  return json.loads(self.beads_file.read_text(encoding="utf-8"))

 def _write_beads(self, beads: List[dict]) -> None:
  self.beads_file.write_text(json.dumps(beads, indent=1), encoding="utf-8")