# 26.05.24

import sys
import logging


# External libraries
import httpx
from bs4 import BeautifulSoup


# Internal utilities
from Src.Util.headers import get_headers
from Src.Util.os import run_node_script


class VideoSource:

    def __init__(self) -> None:
        """
        Initializes the VideoSource object with default values.

        Attributes:
            headers (dict): An empty dictionary to store HTTP headers.
        """
        self.headers = {'user-agent': get_headers()}

    def setup(self, url: str) -> None:
        """
        Sets up the video source with the provided URL.

        Args:
            url (str): The URL of the video source.
        """
        self.url = url

    def make_request(self, url: str) -> str:
        """
        Make an HTTP GET request to the provided URL.

        Args:
            url (str): The URL to make the request to.

        Returns:
            str: The response content if successful, None otherwise.
        """

        try:
            response = httpx.get(url, headers=self.headers, follow_redirects=True)
            response.raise_for_status()
            return response.text
        
        except Exception as e:
            logging.error(f"Request failed: {e}")
            return None

    def parse_html(self, html_content: str) -> BeautifulSoup:
        """
        Parse the provided HTML content using BeautifulSoup.

        Args:
            html_content (str): The HTML content to parse.

        Returns:
            BeautifulSoup: Parsed HTML content if successful, None otherwise.
        """

        try:
            soup = BeautifulSoup(html_content, "html.parser")
            return soup
        
        except Exception as e:
            logging.error(f"Failed to parse HTML content: {e}")
            return None
        
    def get_result_node_js(self, soup):
        """
        Prepares and runs a Node.js script from the provided BeautifulSoup object to retrieve the video URL.

        Args:
            soup (BeautifulSoup): A BeautifulSoup object representing the parsed HTML content.

        Returns:
            str: The output from the Node.js script, or None if the script cannot be found or executed.
        """
        for script in soup.find_all("script"):
            if "eval" in str(script):
                new_script = str(script.text).replace("eval", "var a = ")
                new_script = new_script.replace(")))", ")));console.log(a);")
                return run_node_script(new_script)
            
        return None

    def get_playlist(self) -> str:
        """
        Download a video from the provided URL.

        Returns:
            str: The URL of the downloaded video if successful, None otherwise.
        """
        try:
            html_content = self.make_request(self.url)
            if not html_content:
                logging.error("Failed to fetch HTML content.")
                return None

            soup = self.parse_html(html_content)
            if not soup:
                logging.error("Failed to parse HTML content.")
                return None

            result = self.get_result_node_js(soup)
            if not result:
                logging.error("No video URL found in script.")
                return None
            
            master_playlist = str(result).split(":")[3].split('"}')[0]
            return f"https:{master_playlist}"

        except Exception as e:
            logging.error(f"An error occurred: {e}")
            return None