import json
import logging
import urllib.error
import urllib.request

from pr.config import DEFAULT_MAX_TOKENS, DEFAULT_TEMPERATURE
from pr.core.context import auto_slim_messages

logger = logging.getLogger("pr")


def call_api(
    messages, model, api_url, api_key, use_tools, tools_definition, verbose=False
):
    try:
        messages = auto_slim_messages(messages, verbose=verbose)

        logger.debug(f"=== API CALL START ===")
        logger.debug(f"Model: {model}")
        logger.debug(f"API URL: {api_url}")
        logger.debug(f"Use tools: {use_tools}")
        logger.debug(f"Message count: {len(messages)}")
        headers = {
            "Content-Type": "application/json",
        }

        if api_key:
            headers["Authorization"] = f"Bearer {api_key}"

        data = {
            "model": model,
            "messages": messages,
            "temperature": DEFAULT_TEMPERATURE,
            "max_tokens": DEFAULT_MAX_TOKENS,
        }

        if "gpt-5" in model:
            del data["temperature"]
            del data["max_tokens"]
            logger.debug("GPT-5 detected: removed temperature and max_tokens")

        if use_tools:
            data["tools"] = tools_definition
            data["tool_choice"] = "auto"
            logger.debug(f"Tool calling enabled with {len(tools_definition)} tools")

        request_json = json.dumps(data)
        logger.debug(f"Request payload size: {len(request_json)} bytes")

        req = urllib.request.Request(
            api_url, data=request_json.encode("utf-8"), headers=headers, method="POST"
        )

        logger.debug("Sending HTTP request...")
        with urllib.request.urlopen(req) as response:
            response_data = response.read().decode("utf-8")
            logger.debug(f"Response received: {len(response_data)} bytes")
            result = json.loads(response_data)

            if "usage" in result:
                logger.debug(f"Token usage: {result['usage']}")
            if "choices" in result and result["choices"]:
                choice = result["choices"][0]
                if "message" in choice:
                    msg = choice["message"]
                    logger.debug(f"Response role: {msg.get('role', 'N/A')}")
                    if "content" in msg and msg["content"]:
                        logger.debug(
                            f"Response content length: {len(msg['content'])} chars"
                        )
                    if "tool_calls" in msg:
                        logger.debug(
                            f"Response contains {len(msg['tool_calls'])} tool call(s)"
                        )

        logger.debug("=== API CALL END ===")
        return result

    except urllib.error.HTTPError as e:
        error_body = e.read().decode("utf-8")
        logger.error(f"API HTTP Error: {e.code} - {error_body}")
        logger.debug("=== API CALL FAILED ===")
        return {"error": f"API Error: {e.code}", "message": error_body}
    except Exception as e:
        logger.error(f"API call failed: {e}")
        logger.debug("=== API CALL FAILED ===")
        return {"error": str(e)}


def list_models(model_list_url, api_key):
    try:
        req = urllib.request.Request(model_list_url)
        if api_key:
            req.add_header("Authorization", f"Bearer {api_key}")

        with urllib.request.urlopen(req) as response:
            data = json.loads(response.read().decode("utf-8"))

        return data.get("data", [])
    except Exception as e:
        return {"error": str(e)}