"""
context_acquisition.py

Functions for acquiring context from various sources including LinkedIn profiles,
GitHub profiles, and job postings using browser automation.
"""

import time
import logging
import os
from urllib.parse import urlparse

from selenium import webdriver
from selenium.webdriver.chrome.options import Options
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from selenium.common.exceptions import TimeoutException, WebDriverException

# Set up logging
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)


def get_linkedin_profile_html(profile_url: str, wait_time: int = 10) -> str:
    """
    Retrieve the HTML content of a LinkedIn profile using browser automation.
    The HTML content is saved to the html directory and also returned.
    
    Args:
        profile_url (str): The URL of the LinkedIn profile to scrape
        wait_time (int): Maximum time to wait for page elements to load (default: 10 seconds)
    
    Returns:
        str: The HTML content of the LinkedIn profile page
        
    Raises:
        ValueError: If the URL is not a valid LinkedIn profile URL
        WebDriverException: If there's an issue with the browser automation
        TimeoutException: If the page takes too long to load
        
    Note:
        The HTML content is automatically saved to html/linkedin_profile_<name>_<timestamp>.html
    """

    # Validate LinkedIn URL
    if not profile_url or not isinstance(profile_url, str):
        raise ValueError("Profile URL must be a non-empty string")

    if "linkedin.com/in/" not in profile_url:
        raise ValueError("URL must be a valid LinkedIn profile URL (containing 'linkedin.com/in/')")

    # Configure Chrome options for headless browsing
    chrome_options = Options()
    chrome_options.add_argument("--headless")  # Run in background
    chrome_options.add_argument("--no-sandbox")
    chrome_options.add_argument("--disable-dev-shm-usage")
    chrome_options.add_argument("--disable-gpu")
    chrome_options.add_argument("--window-size=1920,1080")
    chrome_options.add_argument("--user-agent=Mozilla/5.0 (Windows NT 10.0; Win64; x64) " +
        "AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36")

    driver = None
    try:
        # Initialize the Chrome driver
        logger.info("Initializing browser for URL: %s", profile_url)
        driver = webdriver.Chrome(options=chrome_options)
        driver.set_page_load_timeout(30)

        # Navigate to the LinkedIn profile
        logger.info("Navigating to LinkedIn profile...")
        driver.get(profile_url)

        # Wait for the page to load
        # Look for common LinkedIn profile elements
        wait = WebDriverWait(driver, wait_time)

        try:
            # Wait for either the main content or login prompt
            wait.until(
                EC.any_of(
                    EC.presence_of_element_located(( # Profile header
                        By.CSS_SELECTOR,
                        ".pv-top-card"
                    )),
                    EC.presence_of_element_located(( # Profile section
                        By.CSS_SELECTOR,
                        ".profile-section"
                    )),
                    EC.presence_of_element_located(( # Auth wall
                        By.CSS_SELECTOR,
                        ".authwall"
                    )),
                    EC.presence_of_element_located(( # Public profile
                        By.CSS_SELECTOR,
                        ".public-profile"
                    )),
                )
            )

        except TimeoutException:
            logger.warning(
                "Standard LinkedIn elements not found, proceeding with current page state"
            )

        # Additional wait to ensure dynamic content loads
        time.sleep(2)

        # Get the page HTML
        html_content = driver.page_source

        # Clean up HTML by removing blank lines
        cleaned_html = _clean_html_content(html_content)

        logger.info("Successfully retrieved HTML content (%d characters, cleaned to %d characters)", 
                   len(html_content), len(cleaned_html))

        # Save HTML content to file
        _save_html_to_file(cleaned_html, profile_url)

        return cleaned_html

    except WebDriverException as e:
        logger.error("WebDriver error occurred: %s", str(e))
        raise WebDriverException(f"Browser automation failed: {str(e)}") from e

    except Exception as e:
        logger.error("Unexpected error occurred: %s", str(e))
        raise RuntimeError(f"Failed to retrieve LinkedIn profile: {str(e)}") from e

    finally:
        # Always clean up the driver
        if driver:
            try:
                driver.quit()
                logger.info("Browser session closed")
            except WebDriverException as e:
                logger.warning("Error closing browser: %s", str(e))


def _clean_html_content(html_content: str) -> str:
    """
    Clean HTML content by removing blank lines and excessive whitespace.
    
    Args:
        html_content (str): The raw HTML content to clean
        
    Returns:
        str: Cleaned HTML content with blank lines removed
    """
    # Split into lines, strip whitespace, and filter out empty lines
    lines = html_content.split('\n')
    cleaned_lines = [line.rstrip() for line in lines if line.strip()]

    # Join back together with single newlines
    return '\n'.join(cleaned_lines)


def _save_html_to_file(html_content: str, profile_url: str) -> str:
    """
    Save HTML content to a file in the html directory.
    
    Args:
        html_content (str): The HTML content to save
        profile_url (str): The original profile URL for filename generation
        
    Returns:
        str: The path to the saved file
    """
    try:
        # Create html directory if it doesn't exist
        html_dir = os.path.join(os.path.dirname(os.path.dirname(__file__)), 'html')
        os.makedirs(html_dir, exist_ok=True)

        # Generate filename from URL and timestamp
        parsed_url = urlparse(profile_url)
        print(parsed_url)
        profile_name = parsed_url.path.split('/')[2] or 'unknown_profile'
        print(profile_name)
        filename = f"linkedin_profile_{profile_name}.html"

        # Full file path
        file_path = os.path.join(html_dir, filename)

        # Save HTML content
        with open(file_path, 'w', encoding='utf-8') as f:
            f.write(html_content)

        logger.info("HTML content saved to: %s", file_path)
        return file_path

    except Exception as e: # pylint: disable=broad-exception-caught
        logger.warning("Failed to save HTML content: %s", str(e))
        return ""


def setup_chrome_driver_options() -> Options:
    """
    Create and configure Chrome driver options for web scraping.
    
    Returns:
        Options: Configured Chrome options object
    """
    chrome_options = Options()
    chrome_options.add_argument("--headless")
    chrome_options.add_argument("--no-sandbox")
    chrome_options.add_argument("--disable-dev-shm-usage")
    chrome_options.add_argument("--disable-gpu")
    chrome_options.add_argument("--window-size=1920,1080")
    chrome_options.add_argument("--disable-blink-features=AutomationControlled")
    chrome_options.add_experimental_option("excludeSwitches", ["enable-automation"])
    chrome_options.add_experimental_option('useAutomationExtension', False)

    return chrome_options