import tomllib
import tomli_w
from pathlib import Path
from typing import Dict, List, Optional, Union, Any
from src import paths
from src.models import ToolPreset, BiasProfile

class ToolPresetManager:
 def __init__(self, project_root: Optional[Union[str, Path]] = None):
  self.project_root = Path(project_root) if project_root else None

 def _get_path(self, scope: str) -> Path:
  if scope == "global":
   return paths.get_global_tool_presets_path()
  elif scope == "project":
   if not self.project_root:
    raise ValueError("Project root not set for project scope operation.")
   return paths.get_project_tool_presets_path(self.project_root)
  else:
   raise ValueError(f"Invalid scope: {scope}")

 def _read_raw(self, path: Path) -> Dict[str, Any]:
  if not path.exists():
   return {}
  try:
   with open(path, "rb") as f:
    return tomllib.load(f)
  except Exception:
   return {}

 def _write_raw(self, path: Path, data: Dict[str, Any]) -> None:
  path.parent.mkdir(parents=True, exist_ok=True)
  with open(path, "wb") as f:
   tomli_w.dump(data, f)

 def load_all_presets(self) -> Dict[str, ToolPreset]:
  global_path = paths.get_global_tool_presets_path()
  global_data = self._read_raw(global_path).get("presets", {})
  
  presets = {}
  for name, config in global_data.items():
   if isinstance(config, dict):
    presets[name] = ToolPreset.from_dict(name, config)
  
  if self.project_root:
   project_path = paths.get_project_tool_presets_path(self.project_root)
   project_data = self._read_raw(project_path).get("presets", {})
   for name, config in project_data.items():
    if isinstance(config, dict):
     presets[name] = ToolPreset.from_dict(name, config)
  
  return presets

 def load_all(self) -> Dict[str, ToolPreset]:
  """Backward compatibility for load_all()."""
  return self.load_all_presets()

 def save_preset(self, preset: ToolPreset, scope: str = "project") -> None:
  path = self._get_path(scope)
  data = self._read_raw(path)
  if "presets" not in data:
   data["presets"] = {}
  data["presets"][preset.name] = preset.to_dict()
  self._write_raw(path, data)

 def delete_preset(self, name: str, scope: str = "project") -> None:
  path = self._get_path(scope)
  data = self._read_raw(path)
  if "presets" in data and name in data["presets"]:
   del data["presets"][name]
   self._write_raw(path, data)

 def load_all_bias_profiles(self) -> Dict[str, BiasProfile]:
  global_path = paths.get_global_tool_presets_path()
  global_data = self._read_raw(global_path).get("bias_profiles", {})
  
  profiles = {}
  for name, config in global_data.items():
   if isinstance(config, dict):
    cfg = dict(config)
    if "name" not in cfg:
     cfg["name"] = name
    profiles[name] = BiasProfile.from_dict(cfg)
  
  if self.project_root:
   project_path = paths.get_project_tool_presets_path(self.project_root)
   project_data = self._read_raw(project_path).get("bias_profiles", {})
   for name, config in project_data.items():
    if isinstance(config, dict):
     cfg = dict(config)
     if "name" not in cfg:
      cfg["name"] = name
     profiles[name] = BiasProfile.from_dict(cfg)
  
  return profiles

 def save_bias_profile(self, profile: BiasProfile, scope: str = "project") -> None:
  path = self._get_path(scope)
  data = self._read_raw(path)
  if "bias_profiles" not in data:
   data["bias_profiles"] = {}
  data["bias_profiles"][profile.name] = profile.to_dict()
  self._write_raw(path, data)

 def delete_bias_profile(self, name: str, scope: str = "project") -> None:
  path = self._get_path(scope)
  data = self._read_raw(path)
  if "bias_profiles" in data and name in data["bias_profiles"]:
   del data["bias_profiles"][name]
   self._write_raw(path, data)