from typing import Optional, Callable, List
from dataclasses import dataclass, field

@dataclass
class PendingPatch:
  patch_text: str
  file_paths: List[str]
  generated_by: str
  timestamp: float

class PatchModalManager:
  def __init__(self):
    self._pending_patch: Optional[PendingPatch] = None
    self._show_modal: bool = False
    self._on_apply_callback: Optional[Callable[[str], bool]] = None
    self._on_reject_callback: Optional[Callable[[], None]] = None
  
  def request_patch_approval(self, patch_text: str, file_paths: List[str], generated_by: str = "Tier 4 QA") -> bool:
    """
    [C: tests/test_patch_modal.py:test_close_modal, tests/test_patch_modal.py:test_reject_patch, tests/test_patch_modal.py:test_request_patch_approval, tests/test_patch_modal.py:test_reset]
    """
    from time import time
    self._pending_patch = PendingPatch(
      patch_text=patch_text,
      file_paths=file_paths,
      generated_by=generated_by,
      timestamp=time()
    )
    self._show_modal = True
    return True
  
  def get_pending_patch(self) -> Optional[PendingPatch]:
    """
    [C: tests/test_patch_modal.py:test_patch_modal_manager_init, tests/test_patch_modal.py:test_reject_patch, tests/test_patch_modal.py:test_request_patch_approval, tests/test_patch_modal.py:test_reset]
    """
    return self._pending_patch
  
  def is_modal_shown(self) -> bool:
    """
    [C: tests/test_patch_modal.py:test_close_modal, tests/test_patch_modal.py:test_patch_modal_manager_init, tests/test_patch_modal.py:test_reject_patch, tests/test_patch_modal.py:test_request_patch_approval, tests/test_patch_modal.py:test_reset]
    """
    return self._show_modal
  
  def set_apply_callback(self, callback: Callable[[str], bool]) -> None:
    """
    [C: tests/test_patch_modal.py:test_apply_callback, tests/test_patch_modal.py:test_reset]
    """
    self._on_apply_callback = callback
  
  def set_reject_callback(self, callback: Callable[[], None]) -> None:
    """
    [C: tests/test_patch_modal.py:test_reject_callback, tests/test_patch_modal.py:test_reset]
    """
    self._on_reject_callback = callback
  
  def apply_patch(self, patch_text: str) -> bool:
    """
    [C: tests/test_patch_modal.py:test_apply_callback]
    """
    if self._on_apply_callback:
      return self._on_apply_callback(patch_text)
    return False
  
  def reject_patch(self) -> None:
    """
    [C: tests/test_patch_modal.py:test_reject_callback, tests/test_patch_modal.py:test_reject_patch]
    """
    self._pending_patch = None
    self._show_modal = False
    if self._on_reject_callback:
      self._on_reject_callback()
  
  def close_modal(self) -> None:
    """
    [C: tests/test_patch_modal.py:test_close_modal]
    """
    self._show_modal = False
  
  def reset(self) -> None:
    """
    [C: tests/test_patch_modal.py:test_reset]
    """
    self._pending_patch = None
    self._show_modal = False
    self._on_apply_callback = None
    self._on_reject_callback = None

_patch_modal_manager: Optional[PatchModalManager] = None

def get_patch_modal_manager() -> PatchModalManager:
  """
  [C: tests/test_patch_modal.py:test_get_patch_modal_manager_singleton]
  """
  global _patch_modal_manager
  if _patch_modal_manager is None:
    _patch_modal_manager = PatchModalManager()
  return _patch_modal_manager

def reset_patch_modal_manager() -> None:
  """
  [C: tests/test_patch_modal.py:test_get_patch_modal_manager_singleton]
  """
  global _patch_modal_manager
  if _patch_modal_manager:
    _patch_modal_manager.reset()
  _patch_modal_manager = None