from smolagents import CodeAgent,  LiteLLMModel, tool, Tool, load_tool, DuckDuckGoSearchTool, WikipediaSearchTool #, HfApiModel, OpenAIServerModel
import asyncio
import os
import re
import pandas as pd
from typing import Optional
from token_bucket import Limiter, MemoryStorage
import yaml
from PIL import Image, ImageOps
import requests
from io import BytesIO
from markdownify import markdownify
import whisper

import time
import shutil
import traceback


#@tool
#def GoogleSearchTool(query: str) -> str:
#    """Tool for performing Google searches using Custom Search JSON API
#    Args:
#        query (str): Search query string
#    Returns:
#        str: Formatted search results
#    """
#    api_key = os.environ.get("GOOGLE_API_KEY")
#    cse_id = os.environ.get("GOOGLE_CSE_ID")
#    if not api_key or not cse_id:
#        raise ValueError("GOOGLE_API_KEY and GOOGLE_CSE_ID must be set in environment variables.")
#    url = "https://www.googleapis.com/customsearch/v1"
#    params = {
#        "key": api_key,
#        "cx": cse_id,
#        "q": query,
#        "num": 5  # Number of results to return
#    }
#    try:
#        response = requests.get(url, params=params)
#        response.raise_for_status()
#        results = response.json().get("items", [])
#        return "\n".join([f"{item['title']}: {item['link']}" for item in results]) or "No results found."
#    except Exception as e:
#        return f"Error performing Google search: {str(e)}"


from langchain_community.document_loaders import ArxivLoader

@tool
def search_arxiv(query: str) -> str:
    """Search Arxiv for a query and return maximum 3 result.
    
    Args:
        query: The search query.
     Returns:
        str: Formatted search results
    """
    search_docs = ArxivLoader(query=query, load_max_docs=3).load()
    formatted_search_docs = "\n\n---\n\n".join(
        [
            f'<Document source="{doc.metadata["source"]}" page="{doc.metadata.get("page", "")}"/>\n{doc.page_content[:1000]}\n</Document>'
            for doc in search_docs
        ])
    return {"arxiv_results": formatted_search_docs}


class VisitWebpageTool(Tool):
    name = "visit_webpage"
    description = "Visits a webpage at the given url and reads its content as a markdown string. Use this to browse webpages."
    inputs = {'url': {'type': 'string', 'description': 'The url of the webpage to visit.'}}
    output_type = "string"

    def forward(self, url: str) -> str:
        try:
            response = requests.get(url, timeout=50)
            response.raise_for_status()
            markdown_content = markdownify(response.text).strip()
            markdown_content = re.sub(r"\n{3,}", "\n\n", markdown_content)
            from smolagents.utils import truncate_content
            return truncate_content(markdown_content, 10000)
        except requests.exceptions.Timeout:
            return "The request timed out. Please try again later or check the URL."
        except requests.exceptions.RequestException as e:
            return f"Error fetching the webpage: {str(e)}"
        except Exception as e:
            return f"An unexpected error occurred: {str(e)}"

    def __init__(self, *args, **kwargs):
        self.is_initialized = False

class DownloadTaskAttachmentTool(Tool):
    name = "download_file"
    description = "Downloads the file attached to the task ID and returns the local file path. Supports Excel (.xlsx), image (.png, .jpg), audio (.mp3), PDF (.pdf), and Python (.py) files."
    inputs = {'task_id': {'type': 'string', 'description': 'The task id to download attachment from.'}}
    output_type = "string"
    DEFAULT_API_URL = "https://agents-course-unit4-scoring.hf.space"

    def __init__(self, rate_limiter: Optional[Limiter] = None, default_api_url: str = DEFAULT_API_URL, *args, **kwargs):
        self.is_initialized = False
        self.rate_limiter = rate_limiter
        self.default_api_url = default_api_url

    def forward(self, task_id: str) -> str:
        file_url = f"{self.default_api_url}/files/{task_id}"
        print(f"Downloading file for task ID {task_id} from {file_url}...")
        try:
            if self.rate_limiter:
                while not self.rate_limiter.consume(1):
                    print(f"Rate limit reached for downloading file for task {task_id}. Waiting...")
                    time.sleep(4)  # Assuming 15 RPM
            response = requests.get(file_url, stream=True, timeout=50)
            response.raise_for_status()
            
            # Determine file extension based on Content-Type
            content_type = response.headers.get('Content-Type', '').lower()
            if 'image/png' in content_type:
                extension = '.png'
            elif 'image/jpeg' in content_type:
                extension = '.jpg'
            elif 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' in content_type:
                extension = '.xlsx'
            elif 'audio/mpeg' in content_type:
                extension = '.mp3'
            elif 'application/pdf' in content_type:
                extension = '.pdf'
            elif 'text/x-python' in content_type:
                extension = '.py'
            else:
                return f"Error: Unsupported file type {content_type} for task {task_id}. Try using visit_webpage or web_search if the content is online."
            
            local_file_path = f"downloads/{task_id}{extension}"
            os.makedirs("downloads", exist_ok=True)
            with open(local_file_path, "wb") as file:
                for chunk in response.iter_content(chunk_size=8192):
                    file.write(chunk)
            print(f"File downloaded successfully: {local_file_path}")
            return local_file_path
        except requests.exceptions.HTTPError as e:
            if e.response.status_code == 429:
                return f"Error: Rate limit exceeded for task {task_id}. Try again later."
            return f"Error downloading file for task {task_id}: {str(e)}"
        except requests.exceptions.RequestException as e:
            return f"Error downloading file for task {task_id}: {str(e)}"

class SpeechToTextTool(Tool):
    name = "speech_to_text"
    description = (
        "Converts an audio file to text using OpenAI Whisper."
    )
    inputs = {
        "audio_path": {"type": "string", "description": "Path to audio file (.mp3, .wav)"},
    }
    output_type = "string"

    def __init__(self):
        super().__init__()
        self.model = whisper.load_model("base")

    def forward(self, audio_path: str) -> str:
        if not os.path.exists(audio_path):
            return f"Error: File not found at {audio_path}"
        result = self.model.transcribe(audio_path)
        return result.get("text", "")

class ExcelReaderTool(Tool):
    name = "excel_reader"

    description = """
    This tool reads and processes Excel files (.xlsx, .xls).
    It can extract data, calculate statistics, and perform data analysis on spreadsheets.
    """
    inputs = {
        "excel_path": {
            "type": "string"
,
            "description": "The path to the Excel file to read",
        },
        "sheet_name": {
            "type": "string",

            "description": "The name of the sheet to read (optional, defaults to first sheet)",
            "nullable": True
        }
    }
    output_type = "string"
    
    def forward(self, excel_path: str, sheet_name: str = None) -> str:
        """
        Reads and processes the given Excel file.
        """
        try:
            # Check if the file exists
            if not os.path.exists(excel_path):
                return f"Error: Excel file not found at {excel_path}"
                
            import pandas as pd
            
            # Read the Excel file
            if sheet_name:
                df = pd.read_excel(excel_path, sheet_name=sheet_name)
            else:
                df = pd.read_excel(excel_path)
                
            # Get basic info about the data
            info = {
                "shape": df.shape,
                "columns": list(df.columns),
                "dtypes": df.dtypes.to_dict(),
                "head": df.head(5).to_dict()
            }
            
            # Return formatted info
            result = f"Excel file: {excel_path}\n"
            result += f"Shape: {info['shape'][0]} rows × {info['shape'][1]} columns\n\n"
            result += "Columns:\n"
            for col in info['columns']:
                result += f"- {col} ({info['dtypes'].get(col)})\n"
            
            result += "\nPreview (first 5 rows):\n"
            result += df.head(5).to_string()
            
            return result
            
        except Exception as e:
            return f"Error reading Excel file: {str(e)}"
     
class PythonCodeReaderTool(Tool):
    name = "read_python_code"
    description = "Reads a Python (.py) file and returns its content as a string."
    inputs = {
        "file_path": {"type": "string", "description": "The path to the Python file to read"}
    }
    output_type = "string"

    def forward(self, file_path: str) -> str:
        try:
            if not os.path.exists(file_path):
                return f"Error: Python file not found at {file_path}"
            with open(file_path, "r", encoding="utf-8") as file:
                content = file.read()
            return content
        except Exception as e:
            return f"Error reading Python file: {str(e)}"

from tenacity import retry, stop_after_attempt, wait_exponential, retry_if_exception_type
#from smolagents.tools import DuckDuckGoSearchException  # Replace with the actual exception if different

class RetryDuckDuckGoSearchTool(DuckDuckGoSearchTool):
    @retry(
        stop=stop_after_attempt(3),  # Retry up to 3 times
        wait=wait_exponential(multiplier=1, min=4, max=10),  # Wait 4s, 8s, then 10s
        retry=retry_if_exception_type(Exception)  # Retry on any exception
    )
    def forward(self, query: str) -> str:
        return super().forward(query)




class MagAgent:
    def __init__(self, rate_limiter: Optional[Limiter] = None):
        """Initialize the MagAgent with search tools."""
        self.rate_limiter = rate_limiter

        print("Initializing MagAgent with search tools...")
        model = LiteLLMModel(
            model_id="gemini/gemini-2.0-flash",
            api_key= os.environ.get("GEMINI_KEY"),
            max_tokens=8192
        )

#        model = LiteLLMModel(
#            model_id="gemini/gemini-1.5-flash",  # Use standard multimodal model
#            api_key=os.environ.get("GEMINI_KEY"),
#            max_tokens=8192,
#            api_base="https://generativelanguage.googleapis.com/v1beta"  # Correct endpoint
#        )
        
        # Load prompt templates
#        with open("prompts.yaml", 'r') as stream:
#            prompt_templates = yaml.safe_load(stream)

        # Initialize rate limiter for DuckDuckGoSearchTool
        search_rate_limiter = Limiter(rate=10/60, capacity=10, storage=MemoryStorage()) if not rate_limiter else rate_limiter
        
        self.agent = CodeAgent(
            model= model,
            tools=[
                DownloadTaskAttachmentTool(rate_limiter=rate_limiter),
                RetryDuckDuckGoSearchTool(),
                WikipediaSearchTool(),
                SpeechToTextTool(),
                ExcelReaderTool(),
                VisitWebpageTool(),
                PythonCodeReaderTool(),
                search_arxiv,
#                PNG2FENTool,
#                ChessEngineTool(),
#                GoogleSearchTool,
#                ImageAnalysisTool,
            ],
            verbosity_level=2,
#            prompt_templates=prompt_templates,
            add_base_tools=False,
            max_steps=20
        )
        print("MagAgent initialized.")

    async def __call__(self, question: str, task_id: str) -> str:
        """Process a question asynchronously using the MagAgent."""
        print(f"MagAgent received question (first 50 chars): {question[:50]}... Task ID: {task_id}")
        try:
            if self.rate_limiter:
                while not self.rate_limiter.consume(1):
                    print(f"Rate limit reached for task {task_id}. Waiting...")
                    await asyncio.sleep(4)  # Assuming 15 RPM
            # Include task_id in the task prompt to guide the agent
            task = (
#                f"Answer the following question accurately and concisely: \n"
                "You are an advanced AI assistant tasked with answering questions from the GAIA benchmark accurately and concisely. Follow these guidelines:\n\n"
                "1. **Question Parsing**:\n"
                "   - If the question includes direct speech or quoted text (e.g., \"Isn't that hot?\"), treat it as a precise query and preserve the quoted structure in your response.\n\n"
                "2. **Handling Input Data**:\n"
                f"   - If the question references an attachment, use tool to download it with task_id: {task_id}\n"
                "   - When processing external data (e.g., YouTube transcripts, web searches), expect potential issues like missing punctuation, inconsistent formatting, or conversational text.\n"
                "   - If the input is ambiguous, prioritize extracting key information relevant to the question.\n\n"
                "3. **Response Formatting**:\n"
                "   - Provide answers that are concise, accurate, and properly punctuated according to standard English grammar.\n"
                "   - Use quotation marks for direct quotes (e.g., \"Extreamly.\") and appropriate punctuation for lists, sentences, or clarifications.\n"
                "   - If asked about name of place or city, use full complete name without abbreviations (e.g. use Saint Petersburg instead of St.Petersburg). \n"
                "4. **Error Handling**:\n"
                "   - If you cannot retrieve or process data (e.g., due to blocked requests), return a clear error message: \"Unable to retrieve data. Please refine the question or check external sources.\"\n\n"
                f"Answer the following question: \n {question} \n"
         
#                f"Return the answer as a string."
            )
            print(f"Calling agent.run for task {task_id}...")
            response = await asyncio.to_thread(
                self.agent.run,
                task=task
            )
            print(f"Agent.run completed for task {task_id}.")
            response = str(response)
            if not response:
                print(f"No answer found for task {task_id}.")
                response = "No answer found."
            print(f"MagAgent response: {response[:50]}...")
            return response
        except Exception as e:
            error_msg = f"Error processing question for task {task_id}: {str(e)}. Check API key or network connectivity."
            print(error_msg)
            return error_msg