"""
FILE: app/services/edge_registry.py
DESCRIPTION: Single Source of Truth für Kanten-Typen.
             FIX: Regex angepasst auf Format **`canonical`** (Bold + Backticks).
VERSION: 0.6.10 (Regex Precision Update)
"""
import re
import os
import json
import logging
from typing import Dict, Optional, Set

print(">>> MODULE_LOAD: edge_registry.py initialized <<<", flush=True)

from app.config import get_settings

logger = logging.getLogger(__name__)

class EdgeRegistry:
    _instance = None

    def __new__(cls, *args, **kwargs):
        if cls._instance is None:
            cls._instance = super(EdgeRegistry, cls).__new__(cls)
            cls._instance.initialized = False
        return cls._instance

    def __init__(self, vault_root: Optional[str] = None):
        if self.initialized: 
            return
            
        settings = get_settings()
        env_vocab_path = os.getenv("MINDNET_VOCAB_PATH")
        env_vault_root = os.getenv("MINDNET_VAULT_ROOT") or getattr(settings, "MINDNET_VAULT_ROOT", "./vault")
        
        if env_vocab_path:
            self.full_vocab_path = os.path.abspath(env_vocab_path)
        else:
            self.full_vocab_path = os.path.abspath(
                os.path.join(env_vault_root, "01_User_Manual", "01_edge_vocabulary.md")
            )
        
        self.unknown_log_path = "data/logs/unknown_edges.jsonl"
        self.canonical_map: Dict[str, str] = {} 
        self.valid_types: Set[str] = set()
        
        self._load_vocabulary()
        self.initialized = True

    def _load_vocabulary(self):
        """Parst die Markdown-Tabelle im Vault."""
        print(f">>> CHECK: Loading Vocabulary from {self.full_vocab_path}", flush=True)
        
        if not os.path.exists(self.full_vocab_path):
            print(f"!!! [DICT-ERROR] File not found: {self.full_vocab_path} !!!", flush=True)
            return

        # WP-22 Precision Regex:
        # Sucht nach | **`typ`** | oder | **typ** |
        # Die Backticks `? sind jetzt optional enthalten.
        pattern = re.compile(r"\|\s*\*\*`?([a-zA-Z0-9_-]+)`?\*\*\s*\|\s*([^|]+)\|")

        try:
            with open(self.full_vocab_path, "r", encoding="utf-8") as f:
                c_types, c_aliases = 0, 0
                for line in f:
                    match = pattern.search(line)
                    if match:
                        canonical = match.group(1).strip().lower()
                        aliases_str = match.group(2).strip()
                        
                        self.valid_types.add(canonical)
                        self.canonical_map[canonical] = canonical
                        c_types += 1
                        
                        if aliases_str and "Kein Alias" not in aliases_str:
                            # Aliase säubern (entfernt Backticks auch hier)
                            aliases = [a.strip() for a in aliases_str.split(",") if a.strip()]
                            for alias in aliases:
                                clean_alias = alias.replace("`", "").lower().strip().replace(" ", "_")
                                self.canonical_map[clean_alias] = canonical
                                c_aliases += 1
            
            if c_types == 0:
                print("!!! [DICT-WARN] Pattern mismatch! Ensure types are **`canonical`** or **canonical**. !!!", flush=True)
            else:
                print(f"=== [DICT-SUCCESS] Registered {c_types} Canonical Types and {c_aliases} Aliases ===", flush=True)

        except Exception as e:
            print(f"!!! [DICT-FATAL] Error reading file: {e} !!!", flush=True)

    def resolve(self, edge_type: str) -> str:
        """Normalisiert Kanten-Typen via Registry oder loggt Unbekannte."""
        if not edge_type: return "related_to"
        clean_type = edge_type.lower().strip().replace(" ", "_").replace("-", "_")
        
        if clean_type in self.canonical_map:
            return self.canonical_map[clean_type]
        
        self._log_unknown(clean_type)
        return clean_type 

    def _log_unknown(self, edge_type: str):
        try:
            os.makedirs(os.path.dirname(self.unknown_log_path), exist_ok=True)
            entry = {"unknown_type": edge_type, "status": "new"}
            with open(self.unknown_log_path, "a", encoding="utf-8") as f:
                f.write(json.dumps(entry) + "\n")
        except Exception: pass

registry = EdgeRegistry()