#!/usr/bin/env python3
"""
Scrape guilds with selenium
You probably shouldn't use this, but if you really must:
* Set the CHROME environment variable to the path to your chrome or chromium
* You probably want to connect to an existing chrome instance so you can log in first,
  run `chromium --user-data-dir=$HOME/.cache/chromium-emoji-script --remote-debugging-port=9222`
  to start chromium then `env CHROME=$(command -v chromium) ./scrape_guilds.py 127.0.0.1:99222`
* It just gives you json, you have to dump later

"""

import base64
import json
import os.path
import os
import sys
import zlib

from selenium import webdriver
import trio


def setup_driver():
    options = webdriver.ChromeOptions()
    if location := os.getenv("CHROME"):
        options.binary_location = location
    options.add_argument("--start-maximized")
    options.add_argument(
        "--user-data-dir=" + os.path.expanduser("~/.cache/chromium-emoji-script")
    )
    if len(sys.argv) > 1:
        options.add_experimental_option("debuggerAddress", sys.argv[1])

    # options.add_experimental_option("detach", True)
    return webdriver.Chrome(options=options)


async def handle_events(listener, out_file):
    valid_id = None
    decompress = None

    async for event in listener:
        typ = event.__class__.__name__
        if typ == "WebSocketCreated":
            if event.url.startswith("wss://gateway.discord.gg/"):
                valid_id = event.request_id
                decompress = zlib.decompressobj()
        elif typ == "WebSocketFrameReceived":
            if event.request_id != valid_id:
                continue
            message = json.loads(
                decompress.decompress(base64.b64decode(event.response.payload_data))
            )
            message_type = message.get("t")
            await out_file.write(json.dumps(message) + "\n")
            # The data we actually want, might as well flush
            if message_type in ["READY", "GUILD_CREATE"]:
                await out_file.flush()

            print("Got message of type", message_type)


async def main():
    out_path = await trio.Path.cwd() / "out" / "discord" / "events.json"
    await out_path.parent.mkdir(parents=True, exist_ok=True)
    out_file = await out_path.open("a")

    driver = setup_driver()
    async with driver.bidi_connection() as conn:
        devtools, session = conn.devtools, conn.session

        await session.execute(devtools.network.enable())
        listener = session.listen(
            devtools.network.WebSocketCreated,
            devtools.network.WebSocketFrameReceived,
            buffer_size=1024,
        )

        await handle_events(listener, out_file)


if __name__ == "__main__":
    trio.run(main)