import json
import urllib.request
import urllib.error
import logging
from pr.config import DEFAULT_TEMPERATURE, DEFAULT_MAX_TOKENS
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)}