# -*- coding: utf-8 -*-
"""
llm_api.py – v1.2.0 (zentraler .env-Bootstrap, saubere Router-Einbindung, Swagger-Doku)

Änderungen ggü. v1.1.6:
- Zentrales .env-Bootstrapping VOR allen Router-Imports (findet Datei robust; setzt LLMAPI_ENV_FILE/LLMAPI_ENV_BOOTSTRAPPED)
- Konsistente Swagger-Beschreibung + Tags-Metadaten
- Router ohne doppelte Prefixe einbinden (die Prefixe werden in den Routern definiert)
- Root-/health und /version Endpoints
- Defensive Includes (Router-Importfehler verhindern Server-Absturz; Logging statt Crash)
- Beibehaltener globaler Fehlerhandler (generische 500)

Hinweis:
- wiki_router im Canvas (v1.4.2) nutzt bereits robustes .env-Loading, respektiert aber die zentral gesetzten ENV-Variablen.
- Wenn du ENV-Datei an anderem Ort hast, setze in der Systemd-Unit `Environment=LLMAPI_ENV_FILE=/pfad/.env`.
"""
from __future__ import annotations

import os
from pathlib import Path
from textwrap import dedent
from typing import Optional

from fastapi import FastAPI
from fastapi.responses import JSONResponse
from fastapi.middleware.cors import CORSMiddleware

# ----------------------
# Zentraler .env-Bootstrap (VOR Router-Imports ausführen!)
# ----------------------
def _bootstrap_env() -> Optional[str]:
    try:
        from dotenv import load_dotenv, find_dotenv
    except Exception:
        print("[env] python-dotenv nicht installiert – überspringe .env-Loading", flush=True)
        return None

    candidates: list[str] = []
    if os.getenv("LLMAPI_ENV_FILE"):
        candidates.append(os.getenv("LLMAPI_ENV_FILE") or "")
    fd = find_dotenv(".env", usecwd=True)
    if fd:
        candidates.append(fd)
    candidates += [
        str(Path.cwd() / ".env"),
        str(Path(__file__).parent / ".env"),
        str(Path.home() / ".env"),
        str(Path.home() / ".llm-api.env"),
        "/etc/llm-api.env",
    ]

    for p in candidates:
        try:
            if p and Path(p).exists():
                if load_dotenv(p, override=False):
                    os.environ["LLMAPI_ENV_FILE"] = p
                    os.environ["LLMAPI_ENV_BOOTSTRAPPED"] = "1"
                    print(f"[env] loaded: {p}", flush=True)
                    return p
        except Exception as e:
            print(f"[env] load failed for {p}: {e}", flush=True)
    print("[env] no .env found; using process env", flush=True)
    return None

_ENV_SRC = _bootstrap_env()

# ----------------------
# App + OpenAPI-Metadaten
# ----------------------
__version__ = "1.2.0"
print(f"[DEBUG] llm_api.py version {__version__} loaded from {__file__}", flush=True)

TAGS = [
    {
        "name": "wiki",
        "description": dedent(
            """
            MediaWiki-Proxy (Health, Login, Page-Info/Parse, SMW-Ask).
            **ENV**: `WIKI_API_URL`, `WIKI_TIMEOUT`, `WIKI_RETRIES`, `WIKI_SLEEP_MS`, `WIKI_BATCH`.
            """
        ),
    },
    {
        "name": "exercise",
        "description": dedent(
            """
            Übungen (Upsert, Suche, Delete). Upsert-Schlüssel: `external_id` (z. B. `mw:{pageid}`).
            **ENV**: `EXERCISE_COLLECTION`, `QDRANT_HOST`, `QDRANT_PORT`.
            """
        ),
    },
    {
        "name": "plans",
        "description": "Trainingspläne (Templates/Generate/Export).",
    },
]

app = FastAPI(
    title="KI Trainerassistent API",
    description=dedent(
        f"""
        Modulare API für Trainingsplanung und MediaWiki-Import.

        **Version:** {__version__}

        ## Quickstart (CLI)
        ```bash
        python3 wiki_importer.py --all
        python3 wiki_importer.py --all --category "Übungen" --dry-run
        ```
        """
    ),
    version=__version__,
    openapi_tags=TAGS,
    swagger_ui_parameters={"docExpansion": "list", "defaultModelsExpandDepth": 0},
)

# Optional: CORS für lokale UIs/Tools
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_methods=["*"],
    allow_headers=["*"],
)

# ----------------------
# Globaler Fehlerhandler (generisch)
# ----------------------
@app.exception_handler(Exception)
async def unicorn_exception_handler(request, exc):
    return JSONResponse(status_code=500, content={"detail": "Interner Serverfehler."})

# ----------------------
# Router einbinden (WICHTIG: keine zusätzlichen Prefixe hier setzen)
# ----------------------

def _include_router_safely(name: str, import_path: str):
    try:
        module = __import__(import_path, fromlist=["router"])  # lazy import nach ENV-Bootstrap
        app.include_router(module.router)
        print(f"[router] {name} included", flush=True)
    except Exception as e:
        print(f"[router] {name} NOT included: {e}", flush=True)

_include_router_safely("wiki_router", "wiki_router")      # prefix in Datei: /import/wiki
_include_router_safely("embed_router", "embed_router")    
_include_router_safely("exercise_router", "exercise_router")
_include_router_safely("plan_router", "plan_router")
_include_router_safely("plan_session_router", "plan_session_router")

# ----------------------
# Basis-Endpunkte
# ----------------------
@app.get("/health", tags=["wiki"], summary="API-Health (lokal)")
def api_health():
    return {"status": "ok"}

@app.get("/version", tags=["wiki"], summary="API-Version & ENV-Quelle")
def api_version():
    return {"version": __version__, "env_file": _ENV_SRC}