#!/usr/bin/env python

import sys
import subprocess
import time
import random


def ensure_package(pkg):
    try:
        __import__(pkg)
    except ImportError:
        subprocess.check_call([sys.executable, "-m", "pip", "install", pkg])


for pkg in ("bs4", "requests"):
    ensure_package(pkg)

from bs4 import BeautifulSoup
import requests
import argparse


def create_session():
    session = requests.Session()
    session.headers.update({
        "User-Agent": "Mozilla/5.0"
    })
    return session


def fetch(session, method, url, **kwargs):
    for _ in range(3):
        try:
            response = session.request(method, url, timeout=10, **kwargs)
            if response.status_code == 200:
                return response
            time.sleep(5)
        except requests.RequestException:
            time.sleep(5)
    return None


def recherche_duckduckgo(session, query, n):
    url = "https://html.duckduckgo.com/html/"
    response = fetch(session, "POST", url, data={"q": query})

    if not response:
        return []

    soup = BeautifulSoup(response.text, "html.parser")

    results = []
    for result in soup.select("a.result__a")[:n]:
        title = result.get_text(strip=True)
        link = result.get("href")
        if link:
            results.append((title, link))

    time.sleep(random.uniform(1.5, 3.5))
    return results


def extract_text(session, url, max_chars):
    response = fetch(session, "GET", url)

    if not response:
        return "[Erreur: accès impossible]"

    soup = BeautifulSoup(response.text, "html.parser")
    text = soup.get_text(separator=" ", strip=True)

    return (text[:max_chars] + "...") if len(text) > max_chars else text


def main(argc, argv):
    parser = argparse.ArgumentParser(description="Recherche + extraction de texte")
    parser.add_argument("query", type=str)
    parser.add_argument("-n", "--number", type=int, default=5)
    parser.add_argument("--chars", type=int, default=1000)

    args = parser.parse_args(argv[1:])

    session = create_session()
    results = recherche_duckduckgo(session, args.query, args.number)

    for i, (title, link) in enumerate(results, 1):
        print(f"\n{i}. {title}")
        print(f"URL: {link}")
        snippet = extract_text(session, link, args.chars)
        print(f"Extrait: {snippet}")


if __name__ == "__main__":
    main(len(sys.argv), sys.argv)