import json
import logging
import re
from typing import Any

import httpx

from . import profiles
from .config import settings

log = logging.getLogger("mac-worker.ollama")


def _strip_codefence(s: str) -> str:
    s = s.strip()
    if s.startswith("```"):
        s = re.sub(r"^```(?:json)?", "", s, count=1).strip()
        if s.endswith("```"):
            s = s[:-3].strip()
    return s


def _parse_json(text: str) -> dict:
    text = _strip_codefence(text)
    try:
        return json.loads(text)
    except json.JSONDecodeError:
        m = re.search(r"\{.*\}", text, re.S)
        if m:
            return json.loads(m.group(0))
        raise


def _truncate(text: str, max_chars: int = 60000) -> str:
    if len(text) <= max_chars:
        return text
    head = text[: max_chars // 2]
    tail = text[-max_chars // 2 :]
    return head + "\n\n[... gekürzt ...]\n\n" + tail


async def _chat(prompt: str) -> str:
    url = f"{settings.ollama_url.rstrip('/')}/api/generate"
    payload = {
        "model": settings.ollama_model,
        "prompt": prompt,
        "stream": False,
        "options": {"temperature": 0.2},
    }
    log.info("Ollama generate model=%s prompt_len=%d", settings.ollama_model, len(prompt))
    async with httpx.AsyncClient(timeout=settings.ollama_timeout) as c:
        r = await c.post(url, json=payload)
        r.raise_for_status()
        data = r.json()
    return data.get("response", "")


async def summarize(transcript: str, title: str = "", profile_name: str | None = None) -> dict[str, Any]:
    profile = profiles.get(profile_name)
    prompt = profile.summary_prompt.format(
        title=title or "(ohne Titel)",
        transcript=_truncate(transcript),
    )
    log.info("Summarize profile=%s", profile.name)
    raw = await _chat(prompt)
    try:
        return _parse_json(raw)
    except Exception:  # noqa: BLE001
        log.warning("Failed to parse summary JSON — gebe Roh-Antwort als _raw zurück")
        return {"_raw": raw.strip(), "_parse_error": True}


async def make_protocol(
    transcript: str, summary: dict, title: str = "", profile_name: str | None = None
) -> dict:
    profile = profiles.get(profile_name)
    prompt = profile.protocol_prompt.format(
        title=title or "(ohne Titel)",
        summary_json=json.dumps(summary, ensure_ascii=False),
        transcript=_truncate(transcript),
    )
    log.info("Protocol profile=%s", profile.name)
    raw = await _chat(prompt)
    try:
        return _parse_json(raw)
    except Exception:  # noqa: BLE001
        log.warning("Failed to parse protocol JSON — Fallback auf Summary")
        fallback = dict(summary) if isinstance(summary, dict) else {}
        fallback.setdefault("title", title)
        return fallback


async def health() -> dict:
    url = f"{settings.ollama_url.rstrip('/')}/api/tags"
    async with httpx.AsyncClient(timeout=10) as c:
        r = await c.get(url)
        r.raise_for_status()
        return r.json()