from smolagents import tool, Tool
from youtube_transcript_api import YouTubeTranscriptApi
from urllib.parse import urlparse, parse_qs
import os
import ast
import operator as op
from typing import Any, Optional
from datetime import datetime
from smolagents import  tool

@tool
def youtube_tool(video_url: str) -> str:
    """
    Analyzes a YouTube video by extracting its transcript.

    Args:
        video_url (str): The full URL of the YouTube video.

    Returns:
        str: The transcript text of the video or an error message.
    """
    try:
        # Extract video ID from URL
        parsed_url = urlparse(video_url)
        if parsed_url.hostname == 'youtu.be':
            video_id = parsed_url.path[1:]
        else:
            video_id = parse_qs(parsed_url.query).get('v', [None])[0]

        if not video_id:
            return "Error: Could not extract video ID from URL."

        # Fetch transcript
        transcript_list = YouTubeTranscriptApi.fetch(video_id)

        # Combine transcript parts into a single string
        full_text = " ".join([item['text'] for item in transcript_list])

        return full_text

    except Exception as e:
        return f"Error analyzing YouTube video: {str(e)}"


@tool
def get_current_time() -> str:
    """Get the current date and time in a readable format."""
    now = datetime.now()
    return now.strftime("%Y-%m-%d %H:%M:%S")


@tool
def calculate_basic_math(expression: str) -> str:
    """
    Safely evaluate basic mathematical expressions using AST.

    Args:
        expression: A string containing a mathematical expression like "2+2" or "10*5"

    Returns:
        The result of the calculation as a string
    """
    # Safe operations mapping
    SAFE_OPS = {
        ast.Add: op.add,
        ast.Sub: op.sub,
        ast.Mult: op.mul,
        ast.Div: op.truediv,
        ast.Pow: op.pow,
        ast.USub: op.neg
    }

    def _safe_eval(node):
        """Recursively evaluate AST nodes safely."""
        if isinstance(node, ast.Num):  # Numbers
            return node.n
        elif isinstance(node, ast.Constant):  # Python 3.8+ constant nodes
            return node.value
        elif isinstance(node, ast.BinOp):  # Binary operations
            return SAFE_OPS[type(node.op)](_safe_eval(node.left), _safe_eval(node.right))
        elif isinstance(node, ast.UnaryOp):  # Unary operations
            return SAFE_OPS[type(node.op)](_safe_eval(node.operand))
        else:
            raise ValueError(f"Unsupported operation: {type(node)}")

    try:
        # Parse expression into AST and evaluate safely
        node = ast.parse(expression, mode='eval')
        result = _safe_eval(node.body)
        return f"Result: {result}"
    except Exception as e:
        return f"Error calculating '{expression}': {str(e)}"


@tool
def save_note(content: str, filename: Optional[str] = None) -> str:
    """
    Save a note to a text file.

    Args:
        content: The content to save in the note
        filename: Optional filename. If not provided, uses timestamp

    Returns:
        Success message with filename
    """
    try:
        if filename is None:
            timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
            filename = f"note_{timestamp}.txt"

        # Try to create notes directory, fall back to /tmp if permission denied
        try:
            os.makedirs("notes", exist_ok=True)
            notes_dir = "notes"
        except PermissionError:
            notes_dir = "/tmp/notes"
            os.makedirs(notes_dir, exist_ok=True)

        filepath = os.path.join(notes_dir, filename)

        with open(filepath, 'w', encoding='utf-8') as f:
            f.write(content)

        return f"✅ Note saved successfully to: {filepath}"
    except Exception as e:
        return f"❌ Error saving note: {str(e)}"


@tool
def list_saved_notes() -> str:
    """List all saved notes in the notes directory."""
    try:
        # Check both possible notes directories
        all_files = []
        for notes_dir in ["notes", "/tmp/notes"]:
            if os.path.exists(notes_dir):
                files = os.listdir(notes_dir)
                txt_files = [f for f in files if f.endswith('.txt')]
                all_files.extend([(f, notes_dir) for f in txt_files])

        if not all_files:
            return "📂 No notes found. Save a note first!"

        file_list = "\n".join([f"- {file} ({location})" for file, location in sorted(all_files)])
        return f"📂 Saved notes:\n{file_list}"
    except Exception as e:
        return f"❌ Error listing notes: {str(e)}"

class FinalAnswerTool(Tool):
    name = "final_answer"
    description = "Provides a final answer to the given problem."
    inputs = {'answer': {'type': 'any', 'description': 'The final answer to the problem'}}
    output_type = "any"

    def forward(self, answer: Any) -> Any:
        return answer

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