"""llama.cpp Provider for Frigate AI."""

import base64
import json
import logging
from typing import Any, Optional

import requests

from frigate.config import GenAIProviderEnum
from frigate.genai import GenAIClient, register_genai_provider

logger = logging.getLogger(__name__)


@register_genai_provider(GenAIProviderEnum.llamacpp)
class LlamaCppClient(GenAIClient):
    """Generative AI client for Frigate using llama.cpp server."""

    LOCAL_OPTIMIZED_OPTIONS = {
        "temperature": 0.7,
        "repeat_penalty": 1.05,
        "top_p": 0.8,
    }

    provider: str  # base_url
    provider_options: dict[str, Any]

    def _init_provider(self):
        """Initialize the client."""
        self.provider_options = {
            **self.LOCAL_OPTIMIZED_OPTIONS,
            **self.genai_config.provider_options,
        }
        return (
            self.genai_config.base_url.rstrip("/")
            if self.genai_config.base_url
            else None
        )

    def _send(self, prompt: str, images: list[bytes]) -> Optional[str]:
        """Submit a request to llama.cpp server."""
        if self.provider is None:
            logger.warning(
                "llama.cpp provider has not been initialized, a description will not be generated. Check your llama.cpp configuration."
            )
            return None

        try:
            content = []
            for image in images:
                encoded_image = base64.b64encode(image).decode("utf-8")
                content.append(
                    {
                        "type": "image_url",
                        "image_url": {
                            "url": f"data:image/jpeg;base64,{encoded_image}",
                        },
                    }
                )
            content.append(
                {
                    "type": "text",
                    "text": prompt,
                }
            )

            # Build request payload with llama.cpp native options
            payload = {
                "messages": [
                    {
                        "role": "user",
                        "content": content,
                    },
                ],
                **self.provider_options,
            }

            response = requests.post(
                f"{self.provider}/v1/chat/completions",
                json=payload,
                timeout=self.timeout,
            )
            response.raise_for_status()
            result = response.json()

            if (
                result is not None
                and "choices" in result
                and len(result["choices"]) > 0
            ):
                choice = result["choices"][0]
                if "message" in choice and "content" in choice["message"]:
                    return choice["message"]["content"].strip()
            return None
        except Exception as e:
            logger.warning("llama.cpp returned an error: %s", str(e))
            return None

    def get_context_size(self) -> int:
        """Get the context window size for llama.cpp."""
        return self.genai_config.provider_options.get("context_size", 4096)

    def chat_with_tools(
        self,
        messages: list[dict[str, Any]],
        tools: Optional[list[dict[str, Any]]] = None,
        tool_choice: Optional[str] = "auto",
    ) -> dict[str, Any]:
        """
        Send chat messages to llama.cpp server with optional tool definitions.

        Uses the OpenAI-compatible endpoint but passes through all native llama.cpp
        parameters (like slot_id, temperature, etc.) via provider_options.
        """
        if self.provider is None:
            logger.warning(
                "llama.cpp provider has not been initialized. Check your llama.cpp configuration."
            )
            return {
                "content": None,
                "tool_calls": None,
                "finish_reason": "error",
            }

        try:
            openai_tool_choice = None
            if tool_choice:
                if tool_choice == "none":
                    openai_tool_choice = "none"
                elif tool_choice == "auto":
                    openai_tool_choice = "auto"
                elif tool_choice == "required":
                    openai_tool_choice = "required"

            payload = {
                "messages": messages,
            }

            if tools:
                payload["tools"] = tools
                if openai_tool_choice is not None:
                    payload["tool_choice"] = openai_tool_choice

            provider_opts = {
                k: v for k, v in self.provider_options.items() if k != "context_size"
            }
            payload.update(provider_opts)

            response = requests.post(
                f"{self.provider}/v1/chat/completions",
                json=payload,
                timeout=self.timeout,
            )
            response.raise_for_status()
            result = response.json()

            if result is None or "choices" not in result or len(result["choices"]) == 0:
                return {
                    "content": None,
                    "tool_calls": None,
                    "finish_reason": "error",
                }

            choice = result["choices"][0]
            message = choice.get("message", {})

            content = message.get("content")
            if content:
                content = content.strip()
            else:
                content = None

            tool_calls = None
            if "tool_calls" in message and message["tool_calls"]:
                tool_calls = []
                for tool_call in message["tool_calls"]:
                    try:
                        function_data = tool_call.get("function", {})
                        arguments_str = function_data.get("arguments", "{}")
                        arguments = json.loads(arguments_str)
                    except (json.JSONDecodeError, KeyError, TypeError) as e:
                        logger.warning(
                            f"Failed to parse tool call arguments: {e}, "
                            f"tool: {function_data.get('name', 'unknown')}"
                        )
                        arguments = {}

                    tool_calls.append(
                        {
                            "id": tool_call.get("id", ""),
                            "name": function_data.get("name", ""),
                            "arguments": arguments,
                        }
                    )

            finish_reason = "error"
            if "finish_reason" in choice and choice["finish_reason"]:
                finish_reason = choice["finish_reason"]
            elif tool_calls:
                finish_reason = "tool_calls"
            elif content:
                finish_reason = "stop"

            return {
                "content": content,
                "tool_calls": tool_calls,
                "finish_reason": finish_reason,
            }

        except requests.exceptions.Timeout as e:
            logger.warning("llama.cpp request timed out: %s", str(e))
            return {
                "content": None,
                "tool_calls": None,
                "finish_reason": "error",
            }
        except requests.exceptions.RequestException as e:
            error_detail = str(e)
            if hasattr(e, "response") and e.response is not None:
                try:
                    error_body = e.response.text
                    error_detail = f"{str(e)} - Response: {error_body[:500]}"
                except Exception:
                    pass
            logger.warning("llama.cpp returned an error: %s", error_detail)
            return {
                "content": None,
                "tool_calls": None,
                "finish_reason": "error",
            }
        except Exception as e:
            logger.warning("Unexpected error in llama.cpp chat_with_tools: %s", str(e))
            return {
                "content": None,
                "tool_calls": None,
                "finish_reason": "error",
            }