"""Ollama reachability check used by the health endpoints.

This module used to carry a complete second translation client — its own
prompt builder, batching and retries — that nothing in production called any
more. The live translation path is ``translation.ollama.OllamaBackend`` with
the prompt built by ``translation.llm_utils``. The dead copy was removed
because code-intelligence tools resolved "the prompt builder" to it, pointing
anyone about to edit the live one at the wrong blast radius (Forgejo #29).
"""

import logging

import requests

from config import get_settings

logger = logging.getLogger(__name__)


def check_ollama_health(url: str | None = None, model: str | None = None):
    """Check if Ollama is reachable and the model is available.

    ``url`` / ``model`` default to the saved settings; the setup wizard and
    the backend test pass the values from the form, so a test checks what the
    user typed, not what was saved before (#61 A10). The Ollama translation
    backend uses this same check.

    Returns:
        tuple: (is_healthy: bool, message: str)
    """
    settings = get_settings()
    url = (url or settings.ollama_url or "").rstrip("/")
    model = model or settings.ollama_model
    try:
        resp = requests.get(f"{url}/api/tags", timeout=10)
        if resp.status_code != 200:
            return False, f"Ollama returned status {resp.status_code}"
        try:
            data = resp.json()
        except ValueError:
            return False, "Ollama returned invalid JSON"
        models = [m["name"] for m in data.get("models", [])]
        if not any(model in name for name in models):
            return False, f"Model '{model}' not found. Available: {models}"
        return True, "OK"
    except requests.Timeout:
        return False, f"Ollama health check timed out at {url}"
    except requests.ConnectionError:
        return False, f"Cannot connect to Ollama at {url}"
    except Exception as e:
        return False, f"Ollama health check failed: {e}"