"""
FILE: app/services/edge_registry.py
DESCRIPTION: Single Source of Truth für Kanten-Typen mit dynamischem Reload.
             WP-22: Transparente Status-Meldungen für Dev-Umgebungen.
VERSION: 0.7.2 (Fix: Restore Console Visibility & Entry Counts)
"""
import re
import os
import json
import logging
import time
from typing import Dict, Optional, Set, Tuple

from app.config import get_settings

logger = logging.getLogger(__name__)

class EdgeRegistry:
    _instance = None
    # System-Kanten, die NIEMALS manuell im Markdown stehen dürfen
    FORBIDDEN_SYSTEM_EDGES = {"next", "prev", "belongs_to"}

    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")
        
        # Pfad-Priorität: 1. ENV -> 2. _system/dictionary -> 3. 01_User_Manual
        if env_vocab_path:
            self.full_vocab_path = os.path.abspath(env_vocab_path)
        else:
            possible_paths = [
                os.path.join(env_vault_root, "_system", "dictionary", "edge_vocabulary.md"),
                os.path.join(env_vault_root, "01_User_Manual", "01_edge_vocabulary.md")
            ]
            self.full_vocab_path = None
            for p in possible_paths:
                if os.path.exists(p):
                    self.full_vocab_path = os.path.abspath(p)
                    break
            
            if not self.full_vocab_path:
                self.full_vocab_path = os.path.abspath(possible_paths[0])

        self.unknown_log_path = "data/logs/unknown_edges.jsonl"
        self.canonical_map: Dict[str, str] = {} 
        self.valid_types: Set[str] = set()
        self._last_mtime = 0.0 
        
        # Initialer Lade-Versuch mit Konsolen-Feedback
        print(f"\n>>> [EDGE-REGISTRY] Initializing with Path: {self.full_vocab_path}", flush=True)
        self.ensure_latest()
        self.initialized = True

    def ensure_latest(self):
        """Prüft den Zeitstempel und lädt bei Bedarf neu."""
        if not os.path.exists(self.full_vocab_path):
            print(f"!!! [EDGE-REGISTRY ERROR] File not found: {self.full_vocab_path} !!!", flush=True)
            return

        current_mtime = os.path.getmtime(self.full_vocab_path)
        if current_mtime > self._last_mtime:
            self._load_vocabulary()
            self._last_mtime = current_mtime

    def _load_vocabulary(self):
        """Parst das Wörterbuch und meldet die Anzahl der gelesenen Einträge."""
        self.canonical_map.clear()
        self.valid_types.clear()
        
        # Regex deckt | **canonical** | Aliase | ab
        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:
                            aliases = [a.strip() for a in aliases_str.split(",") if a.strip()]
                            for alias in aliases:
                                # Normalisierung: Kleinschreibung und Unterstriche
                                clean_alias = alias.replace("`", "").lower().strip().replace(" ", "_")
                                self.canonical_map[clean_alias] = canonical
                                c_aliases += 1
            
            # Erfolgskontrolle für das Dev-Terminal
            print(f"=== [EDGE-REGISTRY SUCCESS] Loaded {c_types} Canonical Types and {c_aliases} Aliases ===", flush=True)
            logger.info(f"Registry reloaded from {self.full_vocab_path}")

        except Exception as e:
            print(f"!!! [EDGE-REGISTRY FATAL] Error reading file: {e} !!!", flush=True)
            logger.error(f"Error reading vocabulary: {e}")

    def resolve(self, edge_type: str, provenance: str = "explicit", context: dict = None) -> str:
        """Validierung mit Fundort-Logging."""
        self.ensure_latest()
        if not edge_type: return "related_to"
        
        clean_type = edge_type.lower().strip().replace(" ", "_").replace("-", "_")
        ctx = context or {}

        # 1. Schutz der Systemkanten (Verbot für manuelle Nutzung)
        if provenance == "explicit" and clean_type in self.FORBIDDEN_SYSTEM_EDGES:
            self._log_issue(clean_type, "forbidden_system_usage", ctx)
            return "related_to"

        # 2. Akzeptanz interner Strukturkanten
        if provenance == "structure" and clean_type in self.FORBIDDEN_SYSTEM_EDGES:
            return clean_type

        # 3. Mapping via Wörterbuch
        if clean_type in self.canonical_map:
            return self.canonical_map[clean_type]
        
        # 4. Unbekannte Kante
        self._log_issue(clean_type, "unknown_type", ctx)
        return clean_type 

    def _log_issue(self, edge_type: str, error_kind: str, ctx: dict):
        """Detailliertes JSONL-Logging für Debugging."""
        try:
            os.makedirs(os.path.dirname(self.unknown_log_path), exist_ok=True)
            entry = {
                "timestamp": time.strftime("%Y-%m-%d %H:%M:%S"),
                "edge_type": edge_type,
                "error": error_kind,
                "file": ctx.get("file", "unknown"),
                "line": ctx.get("line", "unknown"),
                "note_id": ctx.get("note_id", "unknown")
            }
            with open(self.unknown_log_path, "a", encoding="utf-8") as f:
                f.write(json.dumps(entry) + "\n")
        except Exception: pass

registry = EdgeRegistry()