"""
File: wiki_router.py
Beschreibung:
- Endpunkte für MediaWiki-Integration im lokalen Netzwerk.
- Funktionen:
  * /health: Prüft Verfügbarkeit der MediaWiki-API.
  * /login: Führt clientlogin durch und speichert Session-Cookies.
  * /semantic/pages: Listet alle Übungen inkl. Unterkategorien via SMW-Ask.
  * /parsepage: Ruft Roh-Wikitext über action=parse für eine Seite ab.
  * /info: Liefert pageid und fullurl über Core-API Query.  # CHANGED: robustes 404-Handling
  * /semantic/page: Liefert Metadaten einer Übung, pageid und Wikitext.  # CHANGED: propagiert 404
Version: 1.3.0
"""

# HINWEIS: API-Signaturen/URLs bleiben UNVERÄNDERT.
# Markierungen:  # NEW  /  # CHANGED

from typing import Dict, Any, Optional
from dataclasses import dataclass
from fastapi import APIRouter, HTTPException, Query
from pydantic import BaseModel
import os
import requests
from dotenv import load_dotenv

load_dotenv()

router = APIRouter(prefix="/import/wiki", tags=["wiki"])

WIKI_API_URL = os.getenv("WIKI_API_URL", "https://www.karatetrainer.de/api.php")

# Session für Cookies (Login)
wiki_session = requests.Session()
wiki_session.headers.update({"User-Agent": "local-llm-wiki-proxy/1.3"})

# =====================
# Schemas
# =====================
class WikiLoginRequest(BaseModel):
    username: str
    password: str

class WikiLoginResponse(BaseModel):
    status: str
    message: Optional[str] = None

class PageInfoResponse(BaseModel):
    pageid: int
    title: str
    fullurl: str

class PageContentResponse(BaseModel):
    pageid: int
    title: str
    wikitext: str

# =====================
# Helpers
# =====================
# NEW: Title-Normalisierung (Unterstrich, Gedankenstrich)
_dash_variants = ("-", "–", "—")

def _normalize_titles(title: str):
    yield title
    # Leerzeichen → Unterstrich
    if " " in title:
        yield title.replace(" ", "_")
    # Gedankenstriche ↔ Bindestrich
    for dv in _dash_variants:
        for dv2 in _dash_variants:
            if dv != dv2 and dv in title:
                yield title.replace(dv, dv2)

# NEW: Robustes Pageinfo (None wenn nicht gefunden)
def _fetch_pageinfo_by_title(title: str) -> Optional[PageInfoResponse]:
    params = {
        "action": "query",
        "format": "json",
        "prop": "info",
        "inprop": "url",
        "redirects": 1,  # folgt Weiterleitungen
    }
    for candidate in _normalize_titles(title):
        try:
            r = wiki_session.get(WIKI_API_URL, params={**params, "titles": candidate}, timeout=10)
            r.raise_for_status()
        except Exception as e:
            # Upstream gestört → 502 (aber nicht für nächste Candidate blockieren)
            raise HTTPException(status_code=502, detail=f"Info-Error: {e}")
        pages = r.json().get("query", {}).get("pages", {}) or {}
        if not isinstance(pages, dict) or not pages:
            continue
        # MediaWiki liefert dict {pageid(str): {..}}
        pid_str, page = next(iter(pages.items()))
        # Missing?
        if page.get("missing") is not None or str(pid_str) == "-1":
            continue
        title_out = page.get("title") or candidate
        fullurl = page.get("fullurl") or page.get("canonicalurl") or ""
        try:
            pid = int(pid_str)
        except ValueError:
            pid = int(page.get("pageid", -1))
        return PageInfoResponse(pageid=pid, title=title_out, fullurl=fullurl)
    return None

# =====================
# Endpoints
# =====================
@router.get("/health")
def health() -> Dict[str, str]:
    try:
        r = wiki_session.get(WIKI_API_URL, params={"action": "query", "meta": "siteinfo", "format": "json"}, timeout=5)
        r.raise_for_status()
    except Exception as e:
        raise HTTPException(status_code=502, detail=f"Wiki nicht erreichbar: {e}")
    return {"status": "ok"}

@router.post("/login", response_model=WikiLoginResponse)
def login(data: WikiLoginRequest):
    # Token holen
    try:
        token_resp = wiki_session.get(
            WIKI_API_URL,
            params={"action": "query", "meta": "tokens", "type": "login", "format": "json"},
            timeout=10,
        )
        token_resp.raise_for_status()
        token = token_resp.json().get("query", {}).get("tokens", {}).get("logintoken")
    except Exception as e:
        raise HTTPException(status_code=502, detail=f"Token-Error: {e}")
    if not token:
        raise HTTPException(status_code=502, detail="Kein Login-Token erhalten")

    # clientlogin
    try:
        login_resp = wiki_session.post(
            WIKI_API_URL,
            data={
                "action": "clientlogin",
                "format": "json",
                "username": data.username,
                "password": data.password,
                "logintoken": token,
            },
            timeout=15,
        )
        login_resp.raise_for_status()
        status = login_resp.json().get("clientlogin", {}).get("status")
        if status != "PASS":
            raise HTTPException(status_code=401, detail=f"Login fehlgeschlagen: {status}")
    except HTTPException:
        raise
    except Exception as e:
        raise HTTPException(status_code=502, detail=f"Login-Error: {e}")
    return WikiLoginResponse(status="success")

@router.get("/semantic/pages")
def semantic_pages(category: str = Query(..., description="Kategorie ohne 'Category:'")) -> Dict[str, Any]:
    smw_query = f"[[Category:{category}]]"
    ask_query = f"{smw_query}|limit=50000"
    try:
        r = wiki_session.get(WIKI_API_URL, params={"action": "ask", "query": ask_query, "format": "json"}, timeout=30)
        r.raise_for_status()
    except Exception as e:
        raise HTTPException(status_code=502, detail=f"SMW-Ask-Error: {e}")
    return r.json().get("query", {}).get("results", {})

@router.get("/parsepage", response_model=PageContentResponse)
def parse_page(pageid: int = Query(...), title: str = Query(None)):
    try:
        r = wiki_session.get(WIKI_API_URL, params={"action": "parse", "pageid": pageid, "prop": "wikitext", "format": "json"}, timeout=20)
        r.raise_for_status()
    except Exception as e:
        raise HTTPException(status_code=502, detail=f"Parse-Error: {e}")
    wikitext = r.json().get("parse", {}).get("wikitext", {}).get("*", "")
    return PageContentResponse(pageid=pageid, title=title or "", wikitext=wikitext)

# CHANGED: robustes /info mit 404 statt 500 bei unbekannten Titeln
@router.get("/info", response_model=PageInfoResponse)
def page_info(title: str = Query(..., description="Seitentitel")):
    result = _fetch_pageinfo_by_title(title)
    if not result:
        # sauberes 404 statt StopIteration/500
        raise HTTPException(status_code=404, detail=f"Page not found: {title}")
    return result

# CHANGED: /semantic/page propagiert 404 sauber weiter
@router.get("/semantic/page")
def semantic_page(title: str = Query(...)) -> Dict[str, Any]:
    # SMW-Printouts beschaffen
    entries = semantic_pages(category="Übungen")  # falls Titel→Kategorie-Mapping anders: hier anpassen
    entry = entries.get(title)
    if not entry:
        raise HTTPException(status_code=404, detail="Übung nicht gefunden im SMW-Ask-Ergebnis.")
    # Pageinfo & Wikitext holen
    info = page_info(title=title)  # gibt 404 wenn unbekannt
    parsed = parse_page(pageid=info.pageid, title=title)
    return {
        "title": title,
        "pageid": info.pageid,
        "fullurl": info.fullurl,
        "printouts": entry.get("printouts", {}),
        "wikitext": parsed.wikitext,
    }