import os
import re
import sys
import time
import shutil
import base64
import logging
import fileinput
import urllib.parse
import urllib.request
from typing import List
from selenium import webdriver
from selenium.webdriver.chrome.service import Service
from selenium.webdriver.chrome.options import Options

from modules.svg_handling import extract_colorscheme

# Set up logging
logging.basicConfig(level=logging.INFO, format="%(asctime)s - %(levelname)s - %(message)s")


def replace_all(file, search_exp, replace_exp):
    for line in fileinput.input(file, inplace=1):
        line = re.sub(search_exp, replace_exp, line)
        sys.stdout.write(line)


def take_screenshot(html_file_path: str, css_file: str, output_file: str, driver: webdriver.Chrome) -> None:
    """
    Takes a screenshot of the given HTML file with the specified CSS applied.

    Args:
        html_file_path (str): Path to the HTML file or URL.
        css_file (str): Path to the CSS file to be applied.
        output_file (str): Path where the screenshot will be saved.
        driver (webdriver.Chrome): The Chrome WebDriver instance.
    """
    try:
        # Open the HTML file or URL
        if html_file_path.startswith(("http://", "https://")):
            driver.get(html_file_path)
        else:
            driver.get(f"file://{os.path.abspath(html_file_path)}")

        # Remove current theme.css
        remove_css_script = """
            var links = document.querySelectorAll("link[rel='stylesheet']");
            links.forEach(link => {
                if (link.href.includes('theme.css')) {
                    link.parentNode.removeChild(link);
                }
            });
        """
        driver.execute_script(remove_css_script)

        with open(css_file, "r", encoding="utf-8") as f:
            css_content = f.read()

        # Extract folder icon content
        css_parts = css_content.split(".foldericon {")
        css_head = css_parts[0]
        css_tail = css_parts[1].split("}", maxsplit=1)[1]
        folder_icon_content = css_parts[1].split("}", maxsplit=1)[0].strip()
        folder_icon_content = re.sub(r"/\*.*\*/", "", folder_icon_content)

        for match in re.finditer(r"content: (.*);", folder_icon_content):
            folder_icon_content = match.group(1).replace('"', "")
            break

        if "url" not in folder_icon_content:
            with open(folder_icon_content, "r", encoding="utf-8") as f:
                svg = f.read()
            if "svg.j2" in folder_icon_content:
                colorscheme = extract_colorscheme(css_file)
                for color_key, color_value in colorscheme.items():
                    svg = svg.replace(f"{{{{ {color_key} }}}}", color_value)
            svg = urllib.parse.quote(svg)
            css_content = f'{css_head}\n.foldericon {{\n  content: url("data:image/svg+xml,{svg}");\n}}\n{css_tail}'

        # Encode CSS content as Base64
        encoded_css = base64.b64encode(css_content.encode("utf-8")).decode("utf-8")

        # Inject CSS into HTML using JavaScript
        apply_css_script = f"""
            var style = document.createElement('style');
            style.innerHTML = atob('{encoded_css}');
            document.head.appendChild(style);
        """
        driver.execute_script(apply_css_script)

        # Wait for a while to ensure CSS is applied
        time.sleep(2)

        # Capture screenshot
        driver.save_screenshot(output_file)
        logging.info("Screenshot saved to %s", output_file)

    except Exception as e:
        logging.error("Failed to take screenshot for %s: %s", css_file, e)


def create_preview(html_file_path: str, css_file: str, previews_folder: str):
    out_file = os.path.basename(css_file).removesuffix(".css") + ".html"
    urllib.request.urlretrieve(html_file_path, os.path.join(previews_folder, out_file))
    basename = os.path.basename(css_file)
    path = css_file.removesuffix(basename)
    replace_all(
        os.path.join(previews_folder, out_file),
        r'^\s*?<link rel="stylesheet" href=".*theme.css">\s*?$',
        f'  <link rel="stylesheet" href="file://{path}previews/{basename}">',
    )
    with open(css_file, "r", encoding="utf-8") as f:
        theme = f.read()
    split = theme.split(".foldericon {")
    split2 = split[1].split("}", maxsplit=1)
    themehead = split[0]
    themetail = split2[1]
    foldericon = split2[0].strip()
    foldericon = re.sub(r"/\*.*\*/", "", foldericon)
    for match in re.finditer(r"content: (.*);", foldericon):
        foldericon = match[1]
        foldericon = foldericon.replace('"', "")
        break
    if "url" in foldericon:
        shutil.copyfile(css_file, os.path.join(path, "previews", basename))
    else:
        with open(os.path.join(path, foldericon.removeprefix("themes/")), "r", encoding="utf-8") as f:
            svg = f.read()
        if "svg.j2" in foldericon:
            colorscheme = extract_colorscheme(css_file)
            svg = svg.replace("{{ color1 }}", colorscheme["color1"])
            svg = svg.replace("{{ color2 }}", colorscheme["color2"])
            svg = svg.replace("{{ color3 }}", colorscheme["color3"])
            svg = svg.replace("{{ color4 }}", colorscheme["color4"])
        svg = urllib.parse.quote(svg)
        os.remove(os.path.join(path, "previews", basename))
        with open(os.path.join(path, "previews", basename), "x", encoding="utf-8") as f:
            f.write(themehead + '\n.foldericon {\n  content: url("data:image/svg+xml,' + svg + '");\n}\n' + themetail)


def write_readme(directory_path: str, themes: List[str]) -> None:
    """
    Writes the README file with previews of included themes.

    Args:
        directory_path (str): Path to the folder containing the themes and README.md.
        themes (List[str]): List of theme names.
    """
    readme_path = os.path.join(directory_path, "README.md")
    try:
        with open(readme_path, "r", encoding="utf-8") as f:
            readme = f.read()

        readme_head = readme.split("## Previews of included themes")[0]
        readme_head += "## Previews of included themes\n"
        readme_head += "".join([f"\n### {theme}\n\n![{theme}](screenshots/{theme}.png)\n" for theme in themes])

        with open(readme_path, "w", encoding="utf-8") as f:
            f.write(readme_head)

        logging.info("README.md updated with previews of included themes.")

    except FileNotFoundError:
        logging.error("README.md not found in %s", directory_path)
    except Exception as e:
        logging.error("Failed to write README.md: %s", e)


def write_index(directory_path: str, themes: List[str]) -> None:
    with open(os.path.join(directory_path, "index.html"), "w", encoding="utf-8") as f:
        f.write(
            """<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Themes</title>
</head>
<body>"""
        )
        for theme in themes:
            f.write(f'<a href="previews/{theme}.html">{theme}</a><br>\n')
        f.write("</body></html>")


def main(directory_path: str, html_file_path: str) -> None:
    """
    Main function to take screenshots for each CSS file in the folder and update the README.md.

    Args:
        directory_path (str): Path to the folder containing CSS files.
        html_file_path (str): Path to the HTML file or URL for rendering.
    """
    if not os.path.exists(directory_path):
        logging.error('Error: Folder path "%s" does not exist.', directory_path)
        return

    # Setup Chrome options
    chrome_options = Options()
    chrome_options.add_argument("--headless")  # Run in headless mode, no GUI
    chrome_options.add_argument("--window-size=1920,1080")  # Set window size to at least 1920x1080

    # Initialize Chrome WebDriver
    chromedriver_path = "/usr/bin/chromedriver"  # Replace with your actual path
    service = Service(chromedriver_path)
    driver = webdriver.Chrome(service=service, options=chrome_options)

    try:
        themes = []
        # Iterate over all files in the folder
        for filename in sorted(os.listdir(directory_path)):
            if filename.endswith(".css"):
                theme_name = os.path.splitext(filename)[0]
                themes.append(theme_name)
                css_file = os.path.join(directory_path, filename)
                output_file = os.path.join(directory_path, "screenshots", f"{theme_name}.png")
                previews_folder = os.path.join(directory_path, "previews")

                # Create screenshots folder if it doesn't exist
                os.makedirs(os.path.dirname(output_file), exist_ok=True)
                os.makedirs(previews_folder, exist_ok=True)

                # Take screenshot for this CSS file
                take_screenshot(html_file_path, css_file, output_file, driver)
                create_preview(html_file_path, css_file, previews_folder)

        # Write the README file with the new previews
        write_readme(directory_path, themes)
        write_index(directory_path, themes)

    finally:
        driver.quit()


if __name__ == "__main__":
    if len(sys.argv) != 3:
        logging.error("Usage: python script_name.py directory_path html_file_path")
    else:
        dir_path = sys.argv[1]
        html_path = sys.argv[2]
        main(dir_path, html_path)