import logging
import secrets
from pathlib import Path

import httpx
from fastapi import FastAPI, File, Form, HTTPException, Request, UploadFile
from fastapi.responses import Response
from pydantic import BaseModel

from app.core import joblog, ollama_client, profiles
from app.core.config import settings
from app.core.docx_export import build_docx
from app.core.pdf_export import build_pdf
from app.core.whisper_engine import engine as whisper

logging.basicConfig(level=logging.INFO, format="%(asctime)s [%(levelname)s] %(name)s: %(message)s")
log = logging.getLogger("mac-worker")

# Per-Job Log-Spiegel installieren — fängt alle Logs während eines Requests
# mit X-Job-Id Header und legt sie im Ringbuffer ab.
joblog.install()

app = FastAPI(title="Voice-Agent Mac-Worker")


@app.middleware("http")
async def attach_job_id(request: Request, call_next):
    """Bindet X-Job-Id-Header an die ContextVar, damit Logs zugeordnet werden."""
    raw = request.headers.get("x-job-id")
    token = None
    if raw:
        try:
            token = joblog.current_job.set(int(raw))
        except ValueError:
            token = None
    try:
        return await call_next(request)
    finally:
        if token is not None:
            joblog.current_job.reset(token)


class SummarizeIn(BaseModel):
    transcript: str
    title: str = ""
    profile: str | None = None


class ProtocolIn(BaseModel):
    transcript: str
    summary: dict
    title: str = ""
    profile: str | None = None


class DocxIn(BaseModel):
    data: dict
    profile: str | None = None


class PdfIn(BaseModel):
    data: dict
    profile: str | None = None


class PreloadIn(BaseModel):
    profile: str | None = None


@app.get("/health")
async def health():
    info = {
        "status": "ok",
        "whisper_engine": settings.whisper_engine,
        "whisper_model": settings.whisper_model,
        "ollama_model": settings.ollama_model,
        "ollama_reachable": False,
        "profiles": [p["name"] for p in profiles.list_all()],
    }
    try:
        await ollama_client.health()
        info["ollama_reachable"] = True
    except Exception as e:  # noqa: BLE001
        info["ollama_error"] = str(e)
    return info


@app.get("/api/profiles")
def list_profiles():
    return {"profiles": profiles.list_all()}


@app.post("/api/transcribe")
async def transcribe(audio: UploadFile = File(...), language: str = Form("de")):
    if not audio.filename:
        raise HTTPException(400, "Dateiname fehlt")
    suffix = Path(audio.filename).suffix or ".bin"
    tmp = settings.work_dir / (secrets.token_hex(8) + suffix)
    try:
        with tmp.open("wb") as f:
            while chunk := await audio.read(1024 * 1024):
                f.write(chunk)
        log.info("Transcribing %s (%.1f MB) lang=%s", audio.filename, tmp.stat().st_size / 1024 / 1024, language)
        result = whisper.transcribe(tmp, language=language)
        return result
    finally:
        tmp.unlink(missing_ok=True)


@app.post("/api/summarize")
async def summarize(payload: SummarizeIn):
    if not payload.transcript.strip():
        raise HTTPException(400, "Leerer Transkript")
    return await ollama_client.summarize(payload.transcript, title=payload.title, profile_name=payload.profile)


@app.post("/api/protocol")
async def protocol(payload: ProtocolIn):
    if not payload.transcript.strip():
        raise HTTPException(400, "Leerer Transkript")
    return await ollama_client.make_protocol(
        payload.transcript, payload.summary, title=payload.title, profile_name=payload.profile
    )


@app.post("/api/export/docx")
async def export_docx(payload: DocxIn):
    data = build_docx(payload.data, profile_name=payload.profile)
    return Response(
        content=data,
        media_type="application/vnd.openxmlformats-officedocument.wordprocessingml.document",
        headers={"Content-Disposition": 'attachment; filename="protocol.docx"'},
    )


@app.post("/api/export/pdf")
async def export_pdf(payload: PdfIn):
    data = build_pdf(payload.data, profile_name=payload.profile)
    return Response(
        content=data,
        media_type="application/pdf",
        headers={"Content-Disposition": 'attachment; filename="protocol.pdf"'},
    )


@app.post("/api/preload")
async def preload(payload: PreloadIn):
    """Forciert Ollama-Modell-Load (keep_alive 30 m) mit Mini-Prompt.

    Wird vom LXC-Frontend vor summarize aufgerufen, damit Ollama den
    Modell-Reload nicht *während* der eigentlichen Generierung macht
    (häufige Ursache von 'Server disconnected without sending a response').
    """
    profile_obj = profiles.get(payload.profile)
    log.info("preload model=%s profile=%s", settings.ollama_model, profile_obj.name)
    url = f"{settings.ollama_url.rstrip('/')}/api/generate"
    body = {
        "model": settings.ollama_model,
        "prompt": "ping",
        "stream": False,
        "keep_alive": "30m",
        "options": {"num_predict": 1, "temperature": 0},
    }
    timeout = httpx.Timeout(connect=15.0, read=300.0, write=15.0, pool=10.0)
    try:
        async with httpx.AsyncClient(timeout=timeout) as c:
            r = await c.post(url, json=body)
            r.raise_for_status()
            data = r.json()
    except Exception as e:  # noqa: BLE001
        log.warning("preload failed: %s", e)
        raise HTTPException(503, f"Ollama preload fehlgeschlagen: {e}") from e
    log.info("preload ok load_duration=%dms", int(data.get("load_duration", 0) / 1_000_000))
    return {"ok": True, "model": settings.ollama_model, "load_duration_ns": data.get("load_duration", 0)}


@app.get("/api/jobs/{job_id}/log")
async def job_log(job_id: int, last: int = 200):
    """Liefert die letzten Log-Zeilen, die beim Bearbeiten dieses Jobs entstanden sind."""
    return {"job_id": job_id, "lines": joblog.get(job_id, last)}