import os
import re
import random
import string
import uuid
import json
import logging
import asyncio
import time
from collections import defaultdict
from typing import List, Dict, Any, Optional, AsyncGenerator
from datetime import datetime  # Added import for datetime

from aiohttp import ClientSession, ClientTimeout, ClientError
from fastapi import FastAPI, HTTPException, Request, Depends, Header
from fastapi.responses import StreamingResponse
from pydantic import BaseModel

# Configure logging
logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s [%(levelname)s] %(name)s: %(message)s",
    handlers=[
        logging.StreamHandler()
    ]
)
logger = logging.getLogger(__name__)

# Load environment variables
API_KEYS = os.getenv('API_KEYS', '').split(',')  # Comma-separated API keys
RATE_LIMIT = int(os.getenv('RATE_LIMIT', '60'))  # Requests per minute

if not API_KEYS or API_KEYS == ['']:
    logger.error("No API keys found. Please set the API_KEYS environment variable.")
    raise Exception("API_KEYS environment variable not set.")

# Simple in-memory rate limiter
rate_limit_store = defaultdict(lambda: {"count": 0, "timestamp": time.time()})

async def get_api_key(authorization: str = Header(...)) -> str:
    """
    Dependency to extract and validate the API key from the Authorization header.
    Expects the header in the format: Authorization: Bearer <API_KEY>
    """
    if not authorization.startswith('Bearer '):
        logger.warning("Invalid authorization header format.")
        raise HTTPException(status_code=401, detail='Invalid authorization header format')
    api_key = authorization[7:]
    if api_key not in API_KEYS:
        logger.warning(f"Invalid API key attempted: {api_key}")
        raise HTTPException(status_code=401, detail='Invalid API key')
    return api_key

async def rate_limiter(api_key: str = Depends(get_api_key)):
    """
    Dependency to enforce rate limiting per API key.
    Raises HTTP 429 if the rate limit is exceeded.
    """
    current_time = time.time()
    window_start = rate_limit_store[api_key]["timestamp"]
    if current_time - window_start > 60:
        # Reset the count and timestamp after the time window
        rate_limit_store[api_key] = {"count": 1, "timestamp": current_time}
    else:
        if rate_limit_store[api_key]["count"] >= RATE_LIMIT:
            logger.warning(f"Rate limit exceeded for API key: {api_key}")
            raise HTTPException(status_code=429, detail='Rate limit exceeded')
        rate_limit_store[api_key]["count"] += 1

# Custom exception for model not working
class ModelNotWorkingException(Exception):
    def __init__(self, model: str):
        self.model = model
        self.message = f"The model '{model}' is currently not working. Please try another model or wait for it to be fixed."
        super().__init__(self.message)

# Mock implementations for ImageResponse and to_data_uri
class ImageResponse:
    def __init__(self, url: str, alt: str):
        self.url = url
        self.alt = alt

def to_data_uri(image: Any) -> str:
    return "data:image/png;base64,..."  # Replace with actual base64 data

class Blackbox:
    url = "https://www.blackbox.ai"
    api_endpoint = "https://www.blackbox.ai/api/chat"
    working = True
    supports_stream = True
    supports_system_message = True
    supports_message_history = True

    default_model = 'blackboxai'
    image_models = ['ImageGeneration']
    models = [
        default_model,
        'blackboxai-pro',
        "llama-3.1-8b",
        'llama-3.1-70b',
        'llama-3.1-405b',
        'gpt-4o',
        'gemini-pro',
        'gemini-1.5-flash',
        'claude-sonnet-3.5',
        'PythonAgent',
        'JavaAgent',
        'JavaScriptAgent',
        'HTMLAgent',
        'GoogleCloudAgent',
        'AndroidDeveloper',
        'SwiftDeveloper',
        'Next.jsAgent',
        'MongoDBAgent',
        'PyTorchAgent',
        'ReactAgent',
        'XcodeAgent',
        'AngularJSAgent',
        *image_models,
        'Niansuh',
    ]

    agentMode = {
        'ImageGeneration': {'mode': True, 'id': "ImageGenerationLV45LJp", 'name': "Image Generation"},
        'Niansuh': {'mode': True, 'id': "NiansuhAIk1HgESy", 'name': "Niansuh"},
    }
    trendingAgentMode = {
        "blackboxai": {},
        "gemini-1.5-flash": {'mode': True, 'id': 'Gemini'},
        "llama-3.1-8b": {'mode': True, 'id': "llama-3.1-8b"},
        'llama-3.1-70b': {'mode': True, 'id': "llama-3.1-70b"},
        'llama-3.1-405b': {'mode': True, 'id': "llama-3.1-405b"},
        'blackboxai-pro': {'mode': True, 'id': "BLACKBOXAI-PRO"},
        'PythonAgent': {'mode': True, 'id': "Python Agent"},
        'JavaAgent': {'mode': True, 'id': "Java Agent"},
        'JavaScriptAgent': {'mode': True, 'id': "JavaScript Agent"},
        'HTMLAgent': {'mode': True, 'id': "HTML Agent"},
        'GoogleCloudAgent': {'mode': True, 'id': "Google Cloud Agent"},
        'AndroidDeveloper': {'mode': True, 'id': "Android Developer"},
        'SwiftDeveloper': {'mode': True, 'id': "Swift Developer"},
        'Next.jsAgent': {'mode': True, 'id': "Next.js Agent"},
        'MongoDBAgent': {'mode': True, 'id': "MongoDB Agent"},
        'PyTorchAgent': {'mode': True, 'id': "PyTorch Agent"},
        'ReactAgent': {'mode': True, 'id': "React Agent"},
        'XcodeAgent': {'mode': True, 'id': "Xcode Agent"},
        'AngularJSAgent': {'mode': True, 'id': "AngularJS Agent"},
    }

    userSelectedModel = {
        "gpt-4o": "gpt-4o",
        "gemini-pro": "gemini-pro",
        'claude-sonnet-3.5': "claude-sonnet-3.5",
    }

    model_prefixes = {
        'gpt-4o': '@GPT-4o',
        'gemini-pro': '@Gemini-PRO',
        'claude-sonnet-3.5': '@Claude-Sonnet-3.5',
        'PythonAgent': '@Python Agent',
        'JavaAgent': '@Java Agent',
        'JavaScriptAgent': '@JavaScript Agent',
        'HTMLAgent': '@HTML Agent',
        'GoogleCloudAgent': '@Google Cloud Agent',
        'AndroidDeveloper': '@Android Developer',
        'SwiftDeveloper': '@Swift Developer',
        'Next.jsAgent': '@Next.js Agent',
        'MongoDBAgent': '@MongoDB Agent',
        'PyTorchAgent': '@PyTorch Agent',
        'ReactAgent': '@React Agent',
        'XcodeAgent': '@Xcode Agent',
        'AngularJSAgent': '@AngularJS Agent',
        'blackboxai-pro': '@BLACKBOXAI-PRO',
        'ImageGeneration': '@Image Generation',
        'Niansuh': '@Niansuh',
    }

    model_referers = {
        "blackboxai": f"{url}/?model=blackboxai",
        "gpt-4o": f"{url}/?model=gpt-4o",
        "gemini-pro": f"{url}/?model=gemini-pro",
        "claude-sonnet-3.5": f"{url}/?model=claude-sonnet-3.5"
    }

    model_aliases = {
        "gemini-flash": "gemini-1.5-flash",
        "claude-3.5-sonnet": "claude-sonnet-3.5",
        "flux": "ImageGeneration",
        "niansuh": "Niansuh",
    }

    @classmethod
    def get_model(cls, model: str) -> str:
        if model in cls.models:
            return model
        elif model in cls.userSelectedModel:
            return model
        elif model in cls.model_aliases:
            return cls.model_aliases[model]
        else:
            return cls.default_model

    @classmethod
    async def create_async_generator(
        cls,
        model: str,
        messages: List[Dict[str, str]],
        proxy: Optional[str] = None,
        image: Any = None,
        image_name: Optional[str] = None,
        webSearchMode: bool = False,
        **kwargs
    ) -> AsyncGenerator[Any, None]:
        model = cls.get_model(model)
        logger.info(f"Selected model: {model}")

        if not cls.working or model not in cls.models:
            logger.error(f"Model {model} is not working or not supported.")
            raise ModelNotWorkingException(model)
        
        headers = {
            "accept": "*/*",
            "accept-language": "en-US,en;q=0.9",
            "cache-control": "no-cache",
            "content-type": "application/json",
            "origin": cls.url,
            "pragma": "no-cache",
            "priority": "u=1, i",
            "referer": cls.model_referers.get(model, cls.url),
            "sec-ch-ua": '"Chromium";v="129", "Not=A?Brand";v="8"',
            "sec-ch-ua-mobile": "?0",
            "sec-ch-ua-platform": '"Linux"',
            "sec-fetch-dest": "empty",
            "sec-fetch-mode": "cors",
            "sec-fetch-site": "same-origin",
            "user-agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36",
        }

        if model in cls.model_prefixes:
            prefix = cls.model_prefixes[model]
            if not messages[0]['content'].startswith(prefix):
                logger.debug(f"Adding prefix '{prefix}' to the first message.")
                messages[0]['content'] = f"{prefix} {messages[0]['content']}"
        
        random_id = ''.join(random.choices(string.ascii_letters + string.digits, k=7))
        messages[-1]['id'] = random_id
        messages[-1]['role'] = 'user'
        if image is not None:
            messages[-1]['data'] = {
                'fileText': '',
                'imageBase64': to_data_uri(image),
                'title': image_name
            }
            messages[-1]['content'] = 'FILE:BB\n$#$\n\n$#$\n' + messages[-1]['content']
            logger.debug("Image data added to the message.")
        
        data = {
            "messages": messages,
            "id": random_id,
            "previewToken": None,
            "userId": None,
            "codeModelMode": True,
            "agentMode": {},
            "trendingAgentMode": {},
            "isMicMode": False,
            "userSystemPrompt": None,
            "maxTokens": 99999999,
            "playgroundTopP": 0.9,
            "playgroundTemperature": 0.5,
            "isChromeExt": False,
            "githubToken": None,
            "clickedAnswer2": False,
            "clickedAnswer3": False,
            "clickedForceWebSearch": False,
            "visitFromDelta": False,
            "mobileClient": False,
            "userSelectedModel": None,
            "webSearchMode": webSearchMode,
        }

        if model in cls.agentMode:
            data["agentMode"] = cls.agentMode[model]
        elif model in cls.trendingAgentMode:
            data["trendingAgentMode"] = cls.trendingAgentMode[model]
        elif model in cls.userSelectedModel:
            data["userSelectedModel"] = cls.userSelectedModel[model]
        logger.info(f"Sending request to {cls.api_endpoint} with data: {data}")

        timeout = ClientTimeout(total=60)  # Set an appropriate timeout
        retry_attempts = 10  # Set the number of retry attempts

        for attempt in range(retry_attempts):
            try:
                async with ClientSession(headers=headers, timeout=timeout) as session:
                    async with session.post(cls.api_endpoint, json=data, proxy=proxy) as response:
                        response.raise_for_status()
                        logger.info(f"Received response with status {response.status}")
                        if model == 'ImageGeneration':
                            response_text = await response.text()
                            url_match = re.search(r'https://storage\.googleapis\.com/[^\s\)]+', response_text)
                            if url_match:
                                image_url = url_match.group(0)
                                logger.info(f"Image URL found: {image_url}")
                                yield ImageResponse(image_url, alt=messages[-1]['content'])
                            else:
                                logger.error("Image URL not found in the response.")
                                raise Exception("Image URL not found in the response")
                        else:
                            full_response = ""
                            search_results_json = ""
                            try:
                                async for chunk, _ in response.content.iter_chunks():
                                    if chunk:
                                        decoded_chunk = chunk.decode(errors='ignore')
                                        decoded_chunk = re.sub(r'\$@\$v=[^$]+\$@\$', '', decoded_chunk)
                                        if decoded_chunk.strip():
                                            if '$~~~$' in decoded_chunk:
                                                search_results_json += decoded_chunk
                                            else:
                                                full_response += decoded_chunk
                                                yield decoded_chunk
                                logger.info("Finished streaming response chunks.")
                            except Exception as e:
                                logger.exception("Error while iterating over response chunks.")
                                raise e
                            if data["webSearchMode"] and search_results_json:
                                match = re.search(r'\$~~~\$(.*?)\$~~~\$', search_results_json, re.DOTALL)
                                if match:
                                    try:
                                        search_results = json.loads(match.group(1))
                                        formatted_results = "\n\n**Sources:**\n"
                                        for i, result in enumerate(search_results[:5], 1):
                                            formatted_results += f"{i}. [{result['title']}]({result['link']})\n"
                                        logger.info("Formatted search results.")
                                        yield formatted_results
                                    except json.JSONDecodeError as je:
                                        logger.error("Failed to parse search results JSON.")
                                        raise je
                break  # Exit the retry loop if successful
            except ClientError as ce:
                logger.error(f"Client error occurred: {ce}. Retrying attempt {attempt + 1}/{retry_attempts}")
                if attempt == retry_attempts - 1:
                    raise HTTPException(status_code=502, detail="Error communicating with the external API. | NiansuhAI")
            except asyncio.TimeoutError:
                logger.error(f"Request timed out. Retrying attempt {attempt + 1}/{retry_attempts}")
                if attempt == retry_attempts - 1:
                    raise HTTPException(status_code=504, detail="External API request timed out. | NiansuhAI")
            except Exception as e:
                logger.error(f"Unexpected error: {e}. Retrying attempt {attempt + 1}/{retry_attempts}")
                if attempt == retry_attempts - 1:
                    raise HTTPException(status_code=500, detail=str(e))

# FastAPI app setup
app = FastAPI()

class Message(BaseModel):
    role: str
    content: str

class ChatRequest(BaseModel):
    model: str
    messages: List[Message]
    stream: Optional[bool] = False
    webSearchMode: Optional[bool] = False

def create_response(content: str, model: str, finish_reason: Optional[str] = None) -> Dict[str, Any]:
    return {
        "id": f"chatcmpl-{uuid.uuid4()}",
        "object": "chat.completion.chunk",
        "created": int(datetime.now().timestamp()),  # datetime is now correctly imported
        "model": model,
        "choices": [
            {
                "index": 0,
                "delta": {"content": content, "role": "assistant"},
                "finish_reason": finish_reason,
            }
        ],
        "usage": None,
    }

@app.post("/niansuhai/v1/chat/completions", dependencies=[Depends(rate_limiter)])
async def chat_completions(request: ChatRequest, req: Request, api_key: str = Depends(get_api_key)):
    """
    Endpoint to handle chat completions.
    Protected by API key and rate limiter.
    """
    logger.info(f"Received chat completions request from API key: {api_key} | Request: {request}")
    try:
        # Validate that the requested model is available
        if request.model not in Blackbox.models and request.model not in Blackbox.model_aliases:
            logger.warning(f"Attempt to use unavailable model: {request.model}")
            raise HTTPException(status_code=400, detail="Requested model is not available.")

        messages = [{"role": msg.role, "content": msg.content} for msg in request.messages]
        
        async_generator = Blackbox.create_async_generator(
            model=request.model,
            messages=messages,
            image=None,
            image_name=None,
            webSearchMode=request.webSearchMode
        )

        if request.stream:
            async def generate():
                try:
                    async for chunk in async_generator:
                        if isinstance(chunk, ImageResponse):
                            image_markdown = f"![image]({chunk.url})"
                            response_chunk = create_response(image_markdown, request.model)
                        else:
                            response_chunk = create_response(chunk, request.model)
                        
                        # Yield each chunk in SSE format
                        yield f"data: {json.dumps(response_chunk)}\n\n"
                    
                    # Signal the end of the stream
                    yield "data: [DONE]\n\n"
                except HTTPException as he:
                    error_response = {"error": he.detail}
                    yield f"data: {json.dumps(error_response)}\n\n"
                except Exception as e:
                    logger.exception("Error during streaming response generation.")
                    error_response = {"error": str(e)}
                    yield f"data: {json.dumps(error_response)}\n\n"

            return StreamingResponse(generate(), media_type="text/event-stream")
        else:
            response_content = ""
            async for chunk in async_generator:
                if isinstance(chunk, ImageResponse):
                    response_content += f"![image]({chunk.url})\n"
                else:
                    response_content += chunk

            logger.info(f"Completed non-streaming response generation for API key: {api_key}")
            return {
                "id": f"chatcmpl-{uuid.uuid4()}",
                "object": "chat.completion",
                "created": int(datetime.now().timestamp()),  # datetime is now correctly imported
                "model": request.model,
                "choices": [
                    {
                        "message": {
                            "role": "assistant",
                            "content": response_content
                        },
                        "finish_reason": "stop",
                        "index": 0
                    }
                ],
                "usage": {
                    "prompt_tokens": sum(len(msg['content'].split()) for msg in messages),
                    "completion_tokens": len(response_content.split()),
                    "total_tokens": sum(len(msg['content'].split()) for msg in messages) + len(response_content.split())
                },
            }
    except ModelNotWorkingException as e:
        logger.warning(f"Model not working: {e}")
        raise HTTPException(status_code=503, detail=str(e))
    except HTTPException as he:
        logger.warning(f"HTTPException: {he.detail}")
        raise he
    except Exception as e:
        logger.exception("An unexpected error occurred while processing the chat completions request.")
        raise HTTPException(status_code=500, detail=str(e))

@app.get("/niansuhai/v1/models", dependencies=[Depends(rate_limiter)])
async def get_models(api_key: str = Depends(get_api_key)):
    """
    Endpoint to fetch available models.
    Protected by API key and rate limiter.
    """
    logger.info(f"Fetching available models for API key: {api_key}")
    return {"data": [{"id": model} for model in Blackbox.models]}

# Additional endpoints for better functionality
@app.get("/niansuhai/v1/health", dependencies=[Depends(rate_limiter)])
async def health_check(api_key: str = Depends(get_api_key)):
    """Health check endpoint to verify the service is running."""
    logger.info(f"Health check requested by API key: {api_key}")
    return {"status": "ok"}

@app.get("/niansuhai/v1/models/{model}/status", dependencies=[Depends(rate_limiter)])
async def model_status(model: str, api_key: str = Depends(get_api_key)):
    """Check if a specific model is available."""
    logger.info(f"Model status requested for '{model}' by API key: {api_key}")
    if model in Blackbox.models:
        return {"model": model, "status": "available"}
    elif model in Blackbox.model_aliases:
        actual_model = Blackbox.model_aliases[model]
        return {"model": actual_model, "status": "available via alias"}
    else:
        logger.warning(f"Model not found: {model}")
        raise HTTPException(status_code=404, detail="Model not found")

if __name__ == "__main__":
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=8000)