"""
Advoware History API Client

API client for Advoware History (document timeline) operations.
Provides methods to:
- Get History entries for Akte
- Create new History entry
"""

from typing import Dict, Any, List, Optional
from datetime import datetime
from services.advoware import AdvowareAPI
from services.logging_utils import get_service_logger
from services.exceptions import AdvowareAPIError


class AdvowareHistoryService:
    """
    Advoware History API client.
    
    Provides methods to:
    - Get History entries for Akte
    - Create new History entry
    """
    
    def __init__(self, ctx):
        """
        Initialize service with context.
        
        Args:
            ctx: Motia context for logging
        """
        self.ctx = ctx
        self.logger = get_service_logger(__name__, ctx)
        self.advoware = AdvowareAPI(ctx)  # Reuse existing auth
        
        self.logger.info("AdvowareHistoryService initialized")
    
    def _log(self, message: str, level: str = 'info') -> None:
        """Helper for consistent logging"""
        getattr(self.logger, level)(f"[AdvowareHistoryService] {message}")
    
    async def get_akte_history(self, akte_nr: str) -> List[Dict[str, Any]]:
        """
        Get all History entries for Akte.
        
        Args:
            akte_nr: Aktennummer (10-digit string, e.g., "2019001145")
            
        Returns:
            List of History entry dicts with fields:
            - dat: str (timestamp)
            - art: str (type, e.g., "Schreiben")
            - text: str (description)
            - datei: str (file path, e.g., "V:\\12345\\document.pdf")
            - benutzer: str (user)
            - versendeart: str
            - hnr: int (History entry ID)
            
        Raises:
            AdvowareAPIError: If API call fails (non-retryable)
            
        Note:
            Uses correct endpoint: GET /api/v1/advonet/History?nr={aktennummer}
        """
        self._log(f"Fetching History for Akte {akte_nr}")
        
        try:
            endpoint = "api/v1/advonet/History"
            params = {'nr': akte_nr}
            result = await self.advoware.api_call(endpoint, method='GET', params=params)
            
            if not isinstance(result, list):
                self._log(f"Unexpected History response format: {type(result)}", level='warning')
                return []
            
            self._log(f"Successfully fetched {len(result)} History entries for Akte {akte_nr}")
            return result
        
        except Exception as e:
            error_msg = str(e)
            # Advoware server bug: "Nullable object must have a value" in ConnectorFunctionsHistory.cs
            # This is a server-side bug we cannot fix - return empty list and continue
            if "Nullable object must have a value" in error_msg or "500" in error_msg:
                self._log(
                    f"⚠️  Advoware server error for Akte {akte_nr} (likely null reference bug): {e}", 
                    level='warning'
                )
                self._log(f"Continuing with empty History for Akte {akte_nr}", level='info')
                return []  # Return empty list instead of failing
            
            # For other errors, raise as before
            self._log(f"Failed to fetch History for Akte {akte_nr}: {e}", level='error')
            raise AdvowareAPIError(f"History fetch failed: {e}") from e
    
    async def create_history_entry(
        self,
        akte_id: int,
        entry_data: Dict[str, Any]
    ) -> Dict[str, Any]:
        """
        Create new History entry.
        
        Args:
            akte_id: Advoware Akte ID
            entry_data: History entry data with fields:
                - dat: str (timestamp, ISO format)
                - art: str (type, e.g., "Schreiben")
                - text: str (description)
                - datei: str (file path, e.g., "V:\\12345\\document.pdf")
                - benutzer: str (user, default: "AI")
                - versendeart: str (default: "Y")
                - visibleOnline: bool (default: True)
                - posteingang: int (default: 0)
                
        Returns:
            Created History entry
            
        Raises:
            AdvowareAPIError: If creation fails
        """
        self._log(f"Creating History entry for Akte {akte_id}")
        
        # Ensure required fields with defaults
        now = datetime.now().isoformat()
        
        payload = {
            "betNr": entry_data.get('betNr'),  # Can be null
            "dat": entry_data.get('dat', now),
            "art": entry_data.get('art', 'Schreiben'),
            "text": entry_data.get('text', 'Document uploaded via Motia'),
            "datei": entry_data.get('datei', ''),
            "benutzer": entry_data.get('benutzer', 'AI'),
            "gelesen": entry_data.get('gelesen'),  # Can be null
            "modified": entry_data.get('modified', now),
            "vorgelegt": entry_data.get('vorgelegt', ''),
            "posteingang": entry_data.get('posteingang', 0),
            "visibleOnline": entry_data.get('visibleOnline', True),
            "versendeart": entry_data.get('versendeart', 'Y')
        }
        
        try:
            endpoint = f"api/v1/advonet/Akten/{akte_id}/History"
            result = await self.advoware.api_call(endpoint, method='POST', json_data=payload)
            
            if result:
                self._log(f"Successfully created History entry for Akte {akte_id}")
            
            return result
        
        except Exception as e:
            self._log(f"Failed to create History entry for Akte {akte_id}: {e}", level='error')
            raise AdvowareAPIError(f"History entry creation failed: {e}") from e