#!/usr/bin/env python3
"""
WhatsApp Message Scheduler - Send scheduled messages via WhatsApp Web
"""

import argparse
import asyncio
import json
import logging
import os
import random
import re
from datetime import datetime, timedelta
from pathlib import Path


def setup_environment(debug: bool):
	if not debug:
		os.environ['BROWSER_USE_SETUP_LOGGING'] = 'false'
		os.environ['BROWSER_USE_LOGGING_LEVEL'] = 'critical'
		logging.getLogger().setLevel(logging.CRITICAL)
	else:
		os.environ['BROWSER_USE_SETUP_LOGGING'] = 'true'
		os.environ['BROWSER_USE_LOGGING_LEVEL'] = 'info'


parser = argparse.ArgumentParser(description='WhatsApp Scheduler - Send scheduled messages via WhatsApp Web')
parser.add_argument('--debug', action='store_true', help='Debug mode: show browser and verbose logs')
parser.add_argument('--test', action='store_true', help='Test mode: show what messages would be sent without sending them')
parser.add_argument('--auto', action='store_true', help='Auto mode: respond to unread messages every 30 minutes')
args = parser.parse_args()
setup_environment(args.debug)

from browser_use import Agent, BrowserSession
from browser_use.llm.google import ChatGoogle

GOOGLE_API_KEY = os.getenv('GOOGLE_API_KEY') or os.getenv('GEMINI_API_KEY')

USER_DATA_DIR = Path.home() / '.config' / 'whatsapp_scheduler' / 'browser_profile'
USER_DATA_DIR.mkdir(parents=True, exist_ok=True)
STORAGE_STATE_FILE = USER_DATA_DIR / 'storage_state.json'


async def parse_messages():
	"""Parse messages.txt and extract scheduling info"""
	messages_file = Path('messages.txt')
	if not messages_file.exists():
		print('❌ messages.txt not found!')
		return []

	import aiofiles

	async with aiofiles.open(messages_file) as f:
		content = await f.read()

	llm = ChatGoogle(model='gemini-2.0-flash-exp', temperature=0.1, api_key=GOOGLE_API_KEY)

	now = datetime.now()
	prompt = f"""
	Parse these WhatsApp message instructions and extract:
	1. Contact name (extract just the name, not descriptions)
	2. Message content (what to send)
	3. Date and time (when to send)
	
	Current date/time: {now.strftime('%Y-%m-%d %H:%M')}
	Today is: {now.strftime('%Y-%m-%d')}
	Current time is: {now.strftime('%H:%M')}
	
	Instructions:
	{content}
	
	Return ONLY a JSON array with format:
	[{{"contact": "name", "message": "text", "datetime": "YYYY-MM-DD HH:MM"}}]
	
	CRITICAL: Transform instructions into actual messages:
	
	QUOTED TEXT → Use exactly as-is:
	- Text in "quotes" becomes the exact message
	
	UNQUOTED INSTRUCTIONS → Generate actual content:
	- If it's an instruction to write something → write the actual thing
	- If it's an instruction to tell someone something → write what to tell them
	- If it's an instruction to remind someone → write the actual reminder
	- For multi-line content like poems: use single line with spacing, not line breaks
	
	DO NOT copy the instruction - create the actual message content!
	
	Time Rules:
	- If only time given (like "at 15:30"), use TODAY 
	- If no date specified, assume TODAY
	- If no year given, use current year  
	- Default time is 9:00 if not specified
	- Extract names from parentheses: "hinge date (Camila)" → "Camila"
	- "tomorrow" means {(now + timedelta(days=1)).strftime('%Y-%m-%d')}
	- "next tuesday" or similar means the next occurrence of that day
	"""

	from browser_use.llm.messages import UserMessage

	response = await llm.ainvoke([UserMessage(content=prompt)])
	response_text = response.completion if hasattr(response, 'completion') else str(response)

	# Extract JSON
	json_match = re.search(r'\[.*?\]', response_text, re.DOTALL)
	if json_match:
		try:
			messages = json.loads(json_match.group())
			for msg in messages:
				if 'message' in msg:
					msg['message'] = re.sub(r'\n+', ' • ', msg['message'])
					msg['message'] = re.sub(r'\s+', ' ', msg['message']).strip()
			return messages
		except json.JSONDecodeError:
			pass
	return []


async def send_message(contact, message):
	"""Send a WhatsApp message"""
	print(f'\n📱 Sending to {contact}: {message}')

	llm = ChatGoogle(model='gemini-2.0-flash-exp', temperature=0.3, api_key=GOOGLE_API_KEY)

	task = f"""
	Send WhatsApp message:
	1. Go to https://web.whatsapp.com
	2. Search for contact: {contact}
	3. Click on the contact
	4. Type message: {message}
	5. Press Enter to send
	6. Confirm sent
	"""

	browser = BrowserSession(
		headless=not args.debug,  # headless=False only when debug=True
		user_data_dir=str(USER_DATA_DIR),
		storage_state=str(STORAGE_STATE_FILE) if STORAGE_STATE_FILE.exists() else None,
	)

	agent = Agent(task=task, llm=llm, browser_session=browser)
	await agent.run()
	print(f'✅ Sent to {contact}')


async def auto_respond_to_unread():
	"""Click unread tab and respond to messages"""
	print('\nAuto-responding to unread messages...')

	llm = ChatGoogle(model='gemini-2.0-flash-exp', temperature=0.3, api_key=GOOGLE_API_KEY)

	task = """
	1. Go to https://web.whatsapp.com
	2. Wait for page to load
	3. Click on the "Unread" filter tab
	4. If there are unread messages:
	   - Click on each unread chat
	   - Read the last message
	   - Generate and send a friendly, contextual response
	   - Move to next unread chat
	5. Report how many messages were responded to
	"""

	browser = BrowserSession(
		headless=not args.debug,
		user_data_dir=str(USER_DATA_DIR),
		storage_state=str(STORAGE_STATE_FILE) if STORAGE_STATE_FILE.exists() else None,
	)

	agent = Agent(task=task, llm=llm, browser_session=browser)
	result = await agent.run()
	print('✅ Auto-response complete')
	return result


async def main():
	if not GOOGLE_API_KEY:
		print('❌ Set GOOGLE_API_KEY or GEMINI_API_KEY environment variable')
		return

	print('WhatsApp Scheduler')
	print(f'Profile: {USER_DATA_DIR}')
	print()

	# Auto mode - respond to unread messages periodically
	if args.auto:
		print('AUTO MODE - Responding to unread messages every ~30 minutes')
		print('Press Ctrl+C to stop.\n')

		while True:
			try:
				await auto_respond_to_unread()

				# Wait 30 minutes +/- 5 minutes randomly
				wait_minutes = 30 + random.randint(-5, 5)
				print(f'\n⏰ Next check in {wait_minutes} minutes...')
				await asyncio.sleep(wait_minutes * 60)

			except KeyboardInterrupt:
				print('\n\nAuto mode stopped by user')
				break
			except Exception as e:
				print(f'\n❌ Error in auto mode: {e}')
				print('Waiting 5 minutes before retry...')
				await asyncio.sleep(300)
		return

	# Parse messages
	print('Parsing messages.txt...')
	messages = await parse_messages()

	if not messages:
		print('No messages found')
		return

	print(f'\nFound {len(messages)} messages:')
	for msg in messages:
		print(f'  • {msg["datetime"]}: {msg["message"][:30]}... to {msg["contact"]}')

	now = datetime.now()
	immediate = []
	future = []

	for msg in messages:
		msg_time = datetime.strptime(msg['datetime'], '%Y-%m-%d %H:%M')
		if msg_time <= now:
			immediate.append(msg)
		else:
			future.append(msg)

	if args.test:
		print('\n=== TEST MODE - Preview ===')
		if immediate:
			print(f'\nWould send {len(immediate)} past-due messages NOW:')
			for msg in immediate:
				print(f'  📱 To {msg["contact"]}: {msg["message"]}')
		if future:
			print(f'\nWould monitor {len(future)} future messages:')
			for msg in future:
				print(f'  ⏰ {msg["datetime"]}: To {msg["contact"]}: {msg["message"]}')
		print('\nTest mode complete. No messages sent.')
		return

	if immediate:
		print(f'\nSending {len(immediate)} past-due messages NOW...')
		for msg in immediate:
			await send_message(msg['contact'], msg['message'])

	if future:
		print(f'\n⏰ Monitoring {len(future)} future messages...')
		print('Press Ctrl+C to stop.\n')

		last_status = None

		while future:
			now = datetime.now()
			due = []
			remaining = []

			for msg in future:
				msg_time = datetime.strptime(msg['datetime'], '%Y-%m-%d %H:%M')
				if msg_time <= now:
					due.append(msg)
				else:
					remaining.append(msg)

			for msg in due:
				print(f'\n⏰ Time reached for {msg["contact"]}')
				await send_message(msg['contact'], msg['message'])

			future = remaining

			if future:
				next_msg = min(future, key=lambda x: datetime.strptime(x['datetime'], '%Y-%m-%d %H:%M'))
				current_status = f'Next: {next_msg["datetime"]} to {next_msg["contact"]}'

				if current_status != last_status:
					print(current_status)
					last_status = current_status

				await asyncio.sleep(30)  # Check every 30 seconds

	print('\n✅ All messages processed!')


if __name__ == '__main__':
	asyncio.run(main())