# -*- coding: utf-8 -*-
"""
Ollama / Open WebUI provider for itsulu_blog_publisher.

Supports:
- Ollama running locally:            http://localhost:11434
- Ollama on a self-hosted server:    http://192.168.x.x:11434
- Open WebUI (OpenAI-compatible):    http://your-server:3000
  Open WebUI exposes an OpenAI-compatible /v1/chat/completions endpoint,
  so we auto-detect whether to use the native Ollama /api/chat or the
  OpenAI-compat endpoint based on URL pattern.

Open models tested: Mistral, Mistral-Nemo, Gemma 2, Gemma 3, Llama 3,
  Llama 3.1, Phi-3, Phi-4, Qwen 2.5, DeepSeek-R1.

Note: Open models often return markdown-fenced JSON despite instructions.
The LLM router's _parse_response strips fences before parsing.
"""
import logging
import requests
from odoo.exceptions import UserError

_logger = logging.getLogger(__name__)

# Timeout is generous because local models can be slow to generate
OLLAMA_TIMEOUT = 300  # 5 minutes


class OllamaProvider:
    """
    Calls Ollama /api/chat (native) or OpenAI-compatible /v1/chat/completions
    (Open WebUI). Detects which endpoint to use from the base URL.

    Returns (raw_text: str, tokens_used: int).
    """

    def __init__(self, base_url: str, model: str):
        self.model = model
        # Normalise: strip trailing slash
        base = base_url.rstrip('/')
        # Open WebUI typically runs on port 3000 or a custom path; it accepts
        # the /v1/chat/completions endpoint from the OpenAI spec.
        # Native Ollama runs on port 11434 and uses /api/chat.
        if ':3000' in base or '/api/v1' in base or 'openwebui' in base.lower():
            self._endpoint = f"{base}/v1/chat/completions"
            self._mode = 'openai_compat'
        else:
            self._endpoint = f"{base}/api/chat"
            self._mode = 'ollama_native'

        _logger.debug(
            "OllamaProvider: base_url=%s mode=%s endpoint=%s model=%s",
            base_url, self._mode, self._endpoint, self.model
        )

    def generate(self, system_prompt: str, user_prompt: str) -> tuple:
        if self._mode == 'openai_compat':
            return self._call_openai_compat(system_prompt, user_prompt)
        return self._call_ollama_native(system_prompt, user_prompt)

    def _call_ollama_native(self, system_prompt: str, user_prompt: str) -> tuple:
        payload = {
            'model': self.model,
            'stream': False,
            'messages': [
                {'role': 'system', 'content': system_prompt},
                {'role': 'user', 'content': user_prompt},
            ],
            'format': 'json',   # Ollama JSON mode (available in Ollama >= 0.1.14)
            'options': {
                'num_predict': 4096,
                'temperature': 0.7,
            },
        }

        try:
            resp = requests.post(self._endpoint, json=payload, timeout=OLLAMA_TIMEOUT)
        except requests.ConnectionError as exc:
            raise UserError(
                f"Cannot connect to Ollama at {self._endpoint}. "
                f"Is Ollama running? Error: {exc}"
            ) from exc
        except requests.Timeout:
            raise UserError(
                f"Ollama request timed out after {OLLAMA_TIMEOUT}s. "
                f"The model may be too large for your hardware."
            )
        except requests.RequestException as exc:
            raise UserError(f"Ollama network error: {exc}") from exc

        if not resp.ok:
            raise UserError(
                f"Ollama returned HTTP {resp.status_code}: {resp.text[:300]}"
            )

        data = resp.json()
        raw_text = data.get('message', {}).get('content', '')
        # Ollama native returns prompt_eval_count + eval_count
        tokens_used = (
            data.get('prompt_eval_count', 0) + data.get('eval_count', 0)
        )

        _logger.info(
            "OllamaProvider (native): model=%s tokens_used=%d",
            self.model, tokens_used
        )

        return raw_text, tokens_used

    def _call_openai_compat(self, system_prompt: str, user_prompt: str) -> tuple:
        """Open WebUI / OpenAI-compatible endpoint."""
        payload = {
            'model': self.model,
            'max_tokens': 4096,
            'messages': [
                {'role': 'system', 'content': system_prompt},
                {'role': 'user', 'content': user_prompt},
            ],
        }

        headers = {'Content-Type': 'application/json'}
        # Open WebUI may require an API key set in its config
        # We reuse the ollama_base_url param; users can append ?key=... or
        # the addon settings can store a separate Open WebUI key.
        openwebui_key = ''  # Future: add ir.config_parameter support
        if openwebui_key:
            headers['Authorization'] = f'Bearer {openwebui_key}'

        try:
            resp = requests.post(
                self._endpoint, headers=headers, json=payload, timeout=OLLAMA_TIMEOUT
            )
        except requests.ConnectionError as exc:
            raise UserError(
                f"Cannot connect to Open WebUI at {self._endpoint}. Error: {exc}"
            ) from exc
        except requests.Timeout:
            raise UserError(
                f"Open WebUI request timed out after {OLLAMA_TIMEOUT}s."
            )
        except requests.RequestException as exc:
            raise UserError(f"Open WebUI network error: {exc}") from exc

        if not resp.ok:
            raise UserError(
                f"Open WebUI returned HTTP {resp.status_code}: {resp.text[:300]}"
            )

        data = resp.json()
        choices = data.get('choices', [])
        if not choices:
            raise UserError("Open WebUI returned an empty choices list.")

        raw_text = choices[0].get('message', {}).get('content', '')
        usage = data.get('usage', {})
        tokens_used = usage.get('total_tokens', 0)

        _logger.info(
            "OllamaProvider (openai-compat): model=%s tokens_used=%d",
            self.model, tokens_used
        )

        return raw_text, tokens_used