import json
import os
import requests
from typing import Optional

RESPONSE_FILENAME = 'rc-response.json'
METADATA_FILENAME = 'surfer.json'

def get_current_version() -> Optional[str]:
	"""Retrieve the current version from the metadata file."""
	try:
		with open(METADATA_FILENAME) as f:
			metadata = json.load(f)
			return metadata['version']['candidate']
	except (FileNotFoundError, json.JSONDecodeError) as e:
		print(f"Error reading current version: {e}")
		return None

def get_rc_response() -> Optional[str]:
	"""Get the release candidate response from the response file."""
	try:
		with open(RESPONSE_FILENAME) as f:
			data = json.load(f)
			for tag_dict in data['tags']:
				tag = tag_dict['tag']
				if (tag.startswith('FIREFOX') and tag.endswith('_BUILD1')
						and 'ESR' not in tag and 'b' not in tag):
					return tag.replace('FIREFOX_', '').replace('_BUILD1', '').replace('_', '.')
	except (FileNotFoundError, json.JSONDecodeError) as e:
		print(f"Error reading RC response: {e}")
	return None

def get_pings() -> str:
	"""Build a string of Discord user IDs for mentions."""
	ping_ids = os.getenv('DISCORD_PING_IDS', '')
	return ' '.join(f"<@{ping.strip()}>" for ping in ping_ids.split(',') if ping.strip())

def send_webhook(rc: str) -> None:
	"""Send a message to the Discord webhook."""
	text = f"||{get_pings()}|| New Firefox RC version is available: **{rc}**"
	webhook_url = os.getenv('DISCORD_WEBHOOK_URL')
	
	if webhook_url:
		message = {
			"content": text,
			"username": "Firefox RC Checker",
		}
		try:
			response = requests.post(webhook_url, json=message)
			response.raise_for_status()  # Raise an error for bad responses
		except requests.RequestException as e:
			print(f"Error sending webhook: {e}")
	else:
		print("Webhook URL not set.")

if __name__ == "__main__":
	current_version = get_current_version()
	rc_response = get_rc_response()
	
	if rc_response and rc_response != current_version:
		send_webhook(rc_response)