# SPDX-License-Identifier: EUPL-1.2

import re
import os
import sys
import html
import enum
import json
import shutil
import sqlite3
import argparse
import itertools
import json5 as json
import multiprocessing
import anyio.to_process
from random import randint
from bs4 import BeautifulSoup

TextGenerationMode = enum.Enum('TextGenerationMode', """
	markov
	gpt_2
""".split())

def arg_parser_factory(*, description):
	parser = argparse.ArgumentParser(description=description)
	parser.add_argument(
		'-c', '--cfg', dest='cfg', default='config.json', nargs='?',
		help='Specify a custom location for the config file.'
	)
	return parser

def parse_args(*, description):
	return arg_parser_factory(description=description).parse_args()

def load_config(cfg_path):
	with open('config.defaults.json') as f:
		cfg = json.load(f)

	with open(cfg_path) as f:
		cfg.update(json.load(f))

	if not cfg['site'].startswith('https://') and not cfg['site'].startswith('http://'):
		print("Site must begin with 'https://' or 'http://'. Value '{0}' is invalid - try 'https://{0}' instead.".format(cfg['site']), file=sys.stderr)
		sys.exit(1)

	if not cfg.get('access_token'):
		print('No authentication info', file=sys.stderr)
		print('Get a client id, client secret, and access token here: https://tools.splat.soy/pleroma-access-token/', file=sys.stderr)
		print('Then put `access_token` in your config file.', file=sys.stderr)
		sys.exit(1)

	cfg['generation_mode'] = TextGenerationMode.__members__[cfg['generation_mode']]
	cfg.setdefault('db_path', 'posts.db')

	return cfg

def remove_mentions(cfg, sentence):
	# optionally remove mentions
	if cfg['mention_handling'] == 1:
		return re.sub(r"^\S*@\u200B\S*\s?", "", sentence)
	elif cfg['mention_handling'] == 0:
		sentence = re.sub(r"\S*@\u200B\S*\s?", "", sentence)

	return sentence

async def make_post(cfg, *, mode=TextGenerationMode.markov):
	if mode is TextGenerationMode.markov:
		from generators.markov import make_sentence
	elif mode is TextGenerationMode.gpt_2:
		from generators.gpt_2 import make_sentence

	return await anyio.to_process.run_sync(make_sentence, cfg)

def extract_post_content(text):
	soup = BeautifulSoup(text, "html.parser")
	for el in soup.select('br'):  # replace <br> with linebreak
		el.replace_with('\n')

	for ht in soup.select("a.hashtag, a.mention"):  # convert hashtags and mentions from links to text
		ht.unwrap()

	# TODO glitch-soc and pleroma let you use custom link text. think about how we should handle that.
	for link in soup.select("a"):  # convert <a href='https://example.com'>example.com</a> to just https://example.com
		if 'href' in link:
			# apparently not all a tags have a href,
			# which is understandable if you're doing normal web stuff, but on a social media platform??
			link.replace_with(link["href"])

	for el in soup.select('p'):
		el.replace_with('\n' + el.get_text() + '\n')

	return soup.get_text().strip()