"""
Cain's Core Memory Module (Survival Mode)
Lightweight state management to ensure persistence without heavy dependencies.
"""
import json
import os
import logging
from pathlib import Path

logger = logging.getLogger(__name__)

class Memory:
    def __init__(self, persist_path="/data/memory/state.json"):
        self.persist_path = persist_path
        self._ensure_directory_writable()
        try:
            self.state = self._load()
        except (OSError, IOError, json.JSONDecodeError) as e:
            logger.warning(f"Failed to load state from {self.persist_path}: {e}")
            self.state = {"status": "clean_slate", "runs": 0}

    def _ensure_directory_writable(self):
        """Validate and create the persist_path directory if needed."""
        persist_path = Path(self.persist_path)
        parent_dir = persist_path.parent

        # Create directory if it doesn't exist
        try:
            parent_dir.mkdir(parents=True, exist_ok=True)
        except (OSError, PermissionError) as e:
            logger.error(f"Cannot create directory {parent_dir}: {e}")
            raise

        # Verify directory is writable
        if not os.access(parent_dir, os.W_OK):
            logger.error(f"Directory {parent_dir} is not writable")
            raise PermissionError(f"Cannot write to {parent_dir}")

    def _load(self):
        if os.path.exists(self.persist_path):
            try:
                with open(self.persist_path, 'r') as f:
                    return json.load(f)
            except (json.JSONDecodeError, ValueError) as e:
                logger.warning(f"Corrupt state file at {self.persist_path}: {e}")
                return {"status": "clean_slate", "runs": 0}
            except (OSError, IOError) as e:
                logger.warning(f"Cannot read state file {self.persist_path}: {e}")
                return {"status": "clean_slate", "runs": 0}
        logger.info(f"State file does not exist (first run): {self.persist_path}")
        return {"status": "born", "runs": 0}

    def save(self):
        os.makedirs(os.path.dirname(self.persist_path), exist_ok=True)
        with open(self.persist_path, 'w') as f:
            json.dump(self.state, f)

    def get(self, key, default=None):
        return self.state.get(key, default)

    def set(self, key, value):
        self.state[key] = value
        self.save()

# Global instance
memory = Memory()
memory.set("last_run_status", "alive")