import webbrowser
from collections.abc import Sequence

from mitmproxy import ctx


class WebAddon:
    def load(self, loader):
        loader.add_option("web_open_browser", bool, True, "Start a browser.")
        loader.add_option("web_debug", bool, False, "Enable mitmweb debugging.")
        loader.add_option("web_port", int, 8081, "Web UI port.")
        loader.add_option("web_host", str, "127.0.0.1", "Web UI host.")
        loader.add_option(
            "web_columns",
            Sequence[str],
            ["tls", "icon", "path", "method", "status", "size", "time"],
            "Columns to show in the flow list",
        )

    def running(self):
        if hasattr(ctx.options, "web_open_browser") and ctx.options.web_open_browser:
            web_url = f"http://{ctx.options.web_host}:{ctx.options.web_port}/"
            success = open_browser(web_url)
            if not success:
                ctx.log.info(
                    f"No web browser found. Please open a browser and point it to {web_url}",
                )


def open_browser(url: str) -> bool:
    """
    Open a URL in a browser window.
    In contrast to webbrowser.open, we limit the list of suitable browsers.
    This gracefully degrades to a no-op on headless servers, where webbrowser.open
    would otherwise open lynx.

    Returns:
        True, if a browser has been opened
        False, if no suitable browser has been found.
    """
    browsers = (
        "windows-default",
        "macosx",
        "wslview %s",
        "x-www-browser %s",
        "gnome-open %s",
        "xdg-open",
        "google-chrome",
        "chrome",
        "chromium",
        "chromium-browser",
        "firefox",
        "opera",
        "safari",
    )
    for browser in browsers:
        try:
            b = webbrowser.get(browser)
        except webbrowser.Error:
            pass
        else:
            if b.open(url):
                return True
    return False
