"""
Argon Branch - Represents a MongoDB branch with time travel capabilities
"""

from typing import Dict, List, Any, Optional, TYPE_CHECKING
from datetime import datetime
import logging

if TYPE_CHECKING:
    from .project import Project

logger = logging.getLogger(__name__)

class Branch:
    """
    Represents an Argon branch with time travel and restore capabilities
    """
    
    def __init__(self, name: str, project: 'Project'):
        self.name = name
        self.project = project
        self.metadata = {}
        self._info_cache = None
        
    @property
    def client(self):
        """Get the client from the project"""
        return self.project.client
    
    @property
    def project_id(self) -> str:
        """Get the project ID"""
        return self.project.id
    
    def get_info(self, refresh: bool = False) -> Dict[str, Any]:
        """Get time travel information for this branch"""
        if self._info_cache is None or refresh:
            try:
                self._info_cache = self.client.get_time_travel_info(self.project_id, self.name)
            except Exception as e:
                logger.warning(f"Could not get branch info: {e}")
                self._info_cache = {
                    "branch_id": f"{self.project_id}_{self.name}",
                    "lsn_start": 0,
                    "lsn_end": 0,
                    "total_entries": 0
                }
        return self._info_cache
    
    @property
    def branch_id(self) -> str:
        """Get branch ID"""
        info = self.get_info()
        return info.get("branch_id", f"{self.project_id}_{self.name}")
    
    @property
    def commit_hash(self) -> str:
        """Get current commit hash (LSN as string)"""
        info = self.get_info()
        return str(info.get("lsn_end", 0))
    
    @property
    def created_at(self) -> datetime:
        """Get creation timestamp"""
        # Since we don't have this info from CLI yet, return current time
        return datetime.now()
    
    def get_lsn_range(self) -> tuple:
        """Get the LSN range for this branch"""
        info = self.get_info()
        return (info.get("lsn_start", 0), info.get("lsn_end", 0))
    
    def materialize_at_lsn(self, collection: str, lsn: int) -> List[Dict[str, Any]]:
        """Get collection state at specific LSN (time travel)"""
        # This would need CLI support for querying specific LSN
        logger.warning("materialize_at_lsn not yet implemented in CLI")
        raise NotImplementedError("Time travel queries not yet available via CLI")
    
    def materialize_at_time(self, collection: str, timestamp: datetime) -> List[Dict[str, Any]]:
        """Get collection state at specific timestamp"""
        logger.warning("materialize_at_time not yet implemented in CLI")
        raise NotImplementedError("Time-based queries not yet available via CLI")
    
    def restore_to_lsn(self, lsn: int, preview: bool = True) -> Dict[str, Any]:
        """Restore branch to specific LSN"""
        if preview:
            return self.client.get_restore_preview(self.project_id, self.name, lsn)
        else:
            logger.warning("Actual restore not yet implemented in CLI")
            raise NotImplementedError("Branch restore not yet available via CLI")
    
    def restore_to_time(self, timestamp: datetime, preview: bool = True) -> Dict[str, Any]:
        """Restore branch to specific timestamp"""
        logger.warning("restore_to_time not yet implemented in CLI")
        raise NotImplementedError("Time-based restore not yet available via CLI")
    
    def create_checkpoint(self, name: str, description: str = ""):
        """Create a checkpoint at current state"""
        # Store in metadata for now
        checkpoint = {
            "name": name,
            "description": description,
            "created_at": datetime.now().isoformat(),
            "lsn": self.get_info().get("lsn_end", 0)
        }
        
        if "checkpoints" not in self.metadata:
            self.metadata["checkpoints"] = []
        
        self.metadata["checkpoints"].append(checkpoint)
        logger.info(f"Created checkpoint '{name}' on branch {self.name}")
    
    def list_checkpoints(self) -> List[Dict[str, Any]]:
        """List all checkpoints for this branch"""
        return self.metadata.get("checkpoints", [])
    
    def save(self):
        """Save branch metadata"""
        # Metadata is stored in memory for now
        # In a full implementation, this would persist to the WAL system
        logger.debug(f"Saved metadata for branch {self.name}")
    
    def delete(self):
        """Delete this branch"""
        logger.warning("Branch deletion not yet implemented in CLI")
        raise NotImplementedError("Branch deletion not yet available")
    
    def __repr__(self):
        return f"Branch(name='{self.name}', project='{self.project.name}')"