"""
Utility functions for the GAIA Agent
"""
import os
import re
import shutil
import urllib.parse
import requests
from bs4 import BeautifulSoup

from config import DEFAULT_API_URL, QUESTION_TYPES


def clean_ansi_codes(text):
    """Remove ANSI color codes from terminal output."""
    ansi_escape = re.compile(r'\x1B(?:[@-Z\\-_]|\[[0-?]*[ -/]*[@-~])')
    return ansi_escape.sub('', text)


def clean_answer(answer):
    """Clean the agent response by removing unnecessary formatting."""
    answer = str(answer).strip()
    
    patterns_to_remove = [
        (r'^Final Answer:\s*', ''),
        (r'^Answer:\s*', ''),
        (r'^The answer is\s*', ''),
        (r'^Based on[^,]*,\s*', ''),
        (r'```', ''),
        (r'\*\*', ''),
        (r'^##\s*', '')
    ]
    
    for pattern, replacement in patterns_to_remove:
        answer = re.sub(pattern, replacement, answer, flags=re.IGNORECASE)
    
    return answer.strip()


def detect_question_type(question, file_name):
    """
    Detect the question type to apply a specific strategy.
    
    Args:
        question: The question text
        file_name: Name of the attached file (if any)
        
    Returns:
        str: Question type (see QUESTION_TYPES in config.py)
    """
    q_lower = question.lower()
    
    if "youtube.com" in question or "youtu.be" in question:
        return QUESTION_TYPES['YOUTUBE_VIDEO']
    elif file_name and file_name.endswith(".png"):
        return QUESTION_TYPES['IMAGE_FILE']
    elif file_name and file_name.endswith(".mp3"):
        return QUESTION_TYPES['AUDIO_FILE']
    elif file_name and (file_name.endswith(".xlsx") or file_name.endswith(".csv")):
        return QUESTION_TYPES['DATA_FILE']
    elif file_name and file_name.endswith(".py"):
        return QUESTION_TYPES['CODE_FILE']
    elif "wikipedia" in q_lower:
        return QUESTION_TYPES['WIKIPEDIA']
    elif any(word in q_lower for word in ["how many", "count", "number of"]):
        return QUESTION_TYPES['COUNTING']
    elif "reverse" in q_lower or "backwards" in q_lower or ".rewsna" in question:
        return QUESTION_TYPES['TEXT_MANIPULATION']
    else:
        return QUESTION_TYPES['GENERAL']


def download_file_for_task(task_id):
    """
    Download the attached file for a task if it exists.
    
    Args:
        task_id: The task ID
        
    Returns:
        str: Path to downloaded file or None if no file exists
    """
    file_url = f"{DEFAULT_API_URL}/files/{task_id}"
    try:
        response = requests.get(file_url, stream=True, timeout=30)
        if response.status_code == 200:
            filename = f"file_{task_id}"
            
            # Get real filename from header
            if "content-disposition" in response.headers:
                cd = response.headers["content-disposition"]
                if "filename=" in cd:
                    filename = cd.split("filename=")[1].strip('"')
            
            # Ensure correct extension
            if "." not in filename:
                content_type = response.headers.get("content-type", "")
                if "excel" in content_type or "spreadsheet" in content_type:
                    filename += ".xlsx"
                elif "audio" in content_type or "mpeg" in content_type:
                    filename += ".mp3"
                elif "image" in content_type or "png" in content_type:
                    filename += ".png"
                elif "python" in content_type:
                    filename += ".py"

            with open(filename, 'wb') as f:
                shutil.copyfileobj(response.raw, f)
            
            print(f"      ✓ File downloaded: {filename} ({os.path.getsize(filename)} bytes)")
            return filename
    except Exception as e:
        print(f"      ✗ Error downloading file: {e}")
    return None


def fetch_and_download_links(url, dest_dir, max_files=20):
    """
    Download linked resources from a URL.
    
    Args:
        url: URL of the page to scan
        dest_dir: Destination directory for files
        max_files: Maximum number of files to download
        
    Returns:
        list: List of downloaded file paths
    """
    downloaded = []
    try:
        os.makedirs(dest_dir, exist_ok=True)
        resp = requests.get(url, timeout=20)
        resp.raise_for_status()
        soup = BeautifulSoup(resp.text, "lxml")

        candidates = []
        for tag in soup.find_all(['a', 'link']):
            href = tag.get('href')
            if href:
                candidates.append(href)
        for tag in soup.find_all(['img', 'script', 'source']):
            src = tag.get('src')
            if src:
                candidates.append(src)

        seen = set()
        allowed_exts = {'.png', '.jpg', '.jpeg', '.gif', '.svg', '.pdf', '.zip', 
                       '.mp3', '.mp4', '.py', '.txt', '.csv', '.xlsx', '.xls'}
        
        for c in candidates:
            if len(downloaded) >= max_files:
                break
            full = urllib.parse.urljoin(url, c)
            if full in seen:
                continue
            seen.add(full)

            path = urllib.parse.urlparse(full).path
            ext = os.path.splitext(path)[1].lower()
            
            if ext in allowed_exts:
                try:
                    r = requests.get(full, stream=True, timeout=20)
                    r.raise_for_status()
                    cd = r.headers.get('content-disposition')
                    if cd and 'filename=' in cd:
                        fname = cd.split('filename=')[1].strip('"')
                    else:
                        fname = os.path.basename(path) or f"resource_{len(downloaded)}{ext}"
                    out_path = os.path.join(dest_dir, fname)
                    with open(out_path, 'wb') as of:
                        shutil.copyfileobj(r.raw, of)
                    downloaded.append(out_path)
                except Exception:
                    continue

    except Exception:
        pass

    return downloaded