import pathlib, ics, requests, arrow, frontmatter
import utils

DFMT = "YYYY-MM-DD"
DHFMT = "YYYY-MM-DD HH:mm"
HFMT = "HH:mm"

CEND = '\33[0m'
CRED = '\33[31m'
CGREEN = '\33[32m'
CVIOLET = '\33[35m'
CBLUE   = '\33[34m'

def format_event(title:str, date:str, location:str, desc:str):
	c = frontmatter.Post(content=desc)
	c['title'] = title
	c['date'] = date
	c['location'] = location
	c['type'] = 'event'
	return c

def compare_events(path:pathlib.PosixPath, title:str, date:str, location:str, desc:str):
	p = frontmatter.load(path)
	pd = p.to_dict()
	pd['content'] = pd['content'].strip()
	return p, (pd == {'title': title, 'date': date, 'location': location, 'type': 'event', 'content': desc.strip()})

def update_event(previous:frontmatter.Post, new:frontmatter.Post):
	keys = set(previous.keys()).union(set(new.keys()))
	for k in keys:
		if not str(previous[k]).strip() == str(new[k]).strip():
			print(f"Update '{k}' (y/n)?\n\tprev: {CRED}{previous[k]}{CEND}\n\tnew: {CGREEN}{new[k]}{CEND}")
			c = input()
			if c == 'y':
				previous[k] = new[k]
	
	if not previous.content.strip() == new.content.strip():
		print(f"Update 'content' (y/n)?\n\tprev: {CRED}{previous.content}{CEND}\n\tnew: {CGREEN}{new.content}{CEND}")
		c = input()
		if c == 'y':
			previous.content = new.content

	return previous

def read_date(p:frontmatter.Post):
	date = p['date']
	# 2024-10-06 10:00-12:00
	date = "-".join(date.split("-")[:-1])
	return arrow.get(date, DHFMT)

if __name__ == "__main__":

	conf = utils.load_conf()

	req = requests.get(conf['ics_url']).text
	c = ics.Calendar(req)

	for e in c.events:

		# file path + name
		name = e.name.replace(' ', '-')
		fm_date = e.begin.format(DFMT)
		fm_date_interval = f"{e.begin.format(DHFMT)}-{e.end.format(HFMT)}"
		filename = f'{fm_date}-{name}.md'
		filepath = pathlib.Path(conf['content']) / 'events' / filename

		if not filepath.exists():
			print(f"new event: {e.name}")
			new = format_event(title=e.name, date=fm_date_interval, location=e.location, desc=e.description)
			utils.save_file(filepath, frontmatter.dumps(new), mkdirs=True)

		else:
			prev, eq = compare_events(filepath, e.name, fm_date_interval, e.location, e.description)

			if eq:
				print(f"event {CVIOLET}{e.name}{CEND} already exists... continuing")
				continue
			print(f"updating event: {CBLUE}{e.name}{CEND}")

			## selective update
			new = format_event(title=e.name, date=fm_date_interval, location=e.location, desc=e.description)

			updated = update_event(prev, new)
			utils.save_file(filepath, frontmatter.dumps(updated), overwrite=True)

			print(f"event {e.name} updated")