import os
import json
from dotenv import load_dotenv
from tavily import TavilyClient
from cerebras.cloud.sdk import Cerebras

load_dotenv()

# --- HELPER TOOLS ---

class WebSearchTool:
    """Search the web using Tavily"""
    
    def __init__(self, api_key: str):
        self.client = TavilyClient(api_key=api_key)
    
    def search(self, query: str, max_results: int = 5) -> str:
        """Search and return formatted results"""
        try:
            response = self.client.search(
                query=query,
                search_depth="advanced",
                max_results=max_results,
                include_answer=True
            )
            
            # Format results
            output = []
            
            if response.get("answer"):
                output.append(f"Quick Answer: {response['answer']}\n")
            
            output.append("Search Results:")
            for i, result in enumerate(response.get("results", []), 1):
                output.append(f"\n{i}. {result['title']}")
                output.append(f"   URL: {result['url']}")
                output.append(f"   {result['content'][:300]}...")
            
            return "\n".join(output)
        
        except Exception as e:
            return f"Search error: {str(e)}"

class FileReaderTool:
    """Read various file formats"""
    
    def read(self, file_path: str) -> str:
        """Read file and return content as text"""
        if not os.path.exists(file_path):
            return f"Error: File not found at {file_path}"
        
        ext = os.path.splitext(file_path)[1].lower()
        
        try:
            # DOCX files
            if ext == '.docx':
                try:
                    from docx import Document
                    doc = Document(file_path)
                    text = [para.text for para in doc.paragraphs if para.text.strip()]
                    for table in doc.tables:
                        for row in table.rows:
                            cells = [cell.text.strip() for cell in row.cells]
                            text.append(" | ".join(cells))
                    return "\n".join(text)
                except ImportError:
                    return "Error: python-docx not installed."

            # PDF files
            elif ext == '.pdf':
                try:
                    import pdfplumber
                    with pdfplumber.open(file_path) as pdf:
                        text = [page.extract_text() for page in pdf.pages if page.extract_text()]
                        return "\n".join(text)
                except ImportError:
                    return "Error: pdfplumber not installed."
            
            # Excel/CSV files
            elif ext in ['.xlsx', '.xls', '.csv']:
                try:
                    import pandas as pd
                    if ext == '.csv':
                        df = pd.read_csv(file_path)
                    else:
                        df = pd.read_excel(file_path)
                    return df.to_string()
                except ImportError:
                    return "Error: pandas or openpyxl not installed."
            
            # Text files
            elif ext in ['.txt', '.md', '.json']:
                with open(file_path, 'r', encoding='utf-8') as f:
                    return f.read()
            
            else:
                return f"Unsupported file type: {ext}"
        
        except Exception as e:
            return f"Error reading file: {str(e)}"

class ImageAnalysisTool:
    """Analyze images using OCR or vision models"""
    
    def analyze(self, image_path: str, question: str = "Describe this image") -> str:
        if not os.path.exists(image_path):
            return f"Error: Image not found at {image_path}"
        
        try:
            # Try OCR first (fast and simple)
            import pytesseract
            from PIL import Image
            
            img = Image.open(image_path)
            text = pytesseract.image_to_string(img)
            
            if text.strip():
                return f"Text extracted from image:\n{text}"
            else:
                return "No text found in image (OCR returned empty)"
        
        except ImportError:
            return "Error: pytesseract or Pillow not installed."
        except Exception as e:
            return f"Error analyzing image: {str(e)}"

# --- MAIN AGENT CLASS ---

class BasicAgent:
    """
    Renamed from SimpleResearchAgent to match app.py requirements.
    """
    
    def __init__(self):
        print("--- Initializing BasicAgent ---")
        
        # 1. Load Keys internally
        self.hf_token = os.getenv("HF_TOKEN")
        self.cerebras_key = os.getenv("CEREBRAS_API_KEY")
        self.tavily_key = os.getenv("TAVILY_API_KEY")
        
        if not self.cerebras_key or not self.tavily_key:
            raise ValueError("❌ Missing API Keys. Please check Space Settings.")

        # 2. Initialize LLM
        self.llm = Cerebras(api_key=self.cerebras_key)
        self.model = "gpt-oss-120b" # Or "llama3.1-8b"
        
        # 3. Initialize tools
        self.web_search = WebSearchTool(self.tavily_key)
        self.file_reader = FileReaderTool()
        self.image_analyzer = ImageAnalysisTool()
        
        print("✅ BasicAgent initialized successfully.")
    
    def _call_llm(self, messages: list, temperature: float = 0.0) -> str:
        """Call LLM and return response"""
        try:
            response = self.llm.chat.completions.create(
                model=self.model,
                messages=messages,
                temperature=temperature,
                max_tokens=200 # Prevent long rambling
            )
            content = response.choices[0].message.content
            return content.strip() if content else "Error: Empty response."
        except Exception as e:
            return f"LLM Error: {str(e)}"
    
    def answer(self, question: str, mode="context") -> str:
        """
        Main method called by app.py. 
        Note: app.py only passes 'question', not 'file_path'.
        """
        print(f"Processing: {question[:50]}...")

        # 1. Detect if this is a Logic/Trick question (GAIA style)
        is_logic = any(keyword in question.lower() for keyword in [
            'opposite', 'backwards', 'reversed', 'if you understand', 'python code'
        ])
        
        context_parts = []
        
        # 2. Search Web (Skip if it's purely a logic puzzle)
        if not is_logic:
            # Clean question for search (remove "Answer this..." etc)
            search_results = self.web_search.search(question)
            context_parts.append(f"Web Search Results:\n{search_results}")
        else:
            context_parts.append("Logic/Reasoning Task (No Search Performed)")

        context = "\n\n".join(context_parts)
        
        # 3. Construct System Prompt
        # We use the GAIA-style prompt for strictness
        messages = [
            {
                "role": "system",
                "content": (
                    "You are a precise data extraction engine. "
                    "Answer with ONLY the exact value requested. "
                    "No explanations, no preambles, no conversational filler. "
                    "Examples: '42', 'John Smith', 'Paris', 'right'. "
                )
            },
            {
                "role": "user",
                "content": f"Context:\n{context}\n\nQuestion: {question}\n\nExact Answer:"
            }
        ]
        
        return self._call_llm(messages)

    def __call__(self, question: str) -> str:
        return self.answer(question)

# For local testing
if __name__ == "__main__":
    agent = BasicAgent()
    print(agent("What is the capital of France?"))