from datetime import datetime, timezone, timedelta
from typing import List, Dict

import subprocess


def time_to_milliseconds(time,length_to_cut) -> int:
	return  int(time * 1000 - length_to_cut * 1000)

def add_html_tags_to_description(input_text) -> str:
	return("<p>"+input_text.replace("\n\n", "</p>\n<p>").replace("\n", "<br>")+"</p>")
	

def get_friday_number(extracted_timestamp) -> int:
	dt = datetime.fromtimestamp(extracted_timestamp)
	start_of_year = datetime(dt.year, 1, 1)
	days_until_first_friday = (4 - start_of_year.weekday()) % 7
	first_friday = start_of_year + timedelta(days=days_until_first_friday)
	fridays_passed = (dt - first_friday).days // 7 + 1
	return fridays_passed

def return_url_of_latest_episode(base_url:str) -> str:
	result = subprocess.run(["get_iplayer","--pid-recursive-list",base_url], capture_output=True, text=True)
	latest_episode_id = result.stdout.split("\n")[-3].split(",")[-1][1:]
	return (f"https://www.bbc.co.uk/sounds/play/{latest_episode_id}")

def modify_chapters_for_ffmpeg(chapters: List[Dict], length_to_cut: float) -> str:
	"""
	Converts chapter times to ffmpeg-compatible metadata format, adjusting by length_to_cut.

	Args:
		chapters (list): List of chapter dicts with "start_time", "end_time", and "title".
		length_to_cut (int/float): Amount of time to cut from start, in seconds.

	Returns:
		str: Chapters formatted as ffmpeg metadata.
	"""
	for entry in chapters:
		if "start_time" in entry:
			entry["start_time"]=time_to_milliseconds(entry["start_time"],length_to_cut)
		if "end_time" in entry:
			entry["end_time"]=time_to_milliseconds(entry["end_time"],length_to_cut)	

	chapter_format = ";FFMETADATA1\n"
	for entry in chapters:
		chapter_format+=("[CHAPTER]\n")
		chapter_format+=("TIMEBASE=1/1000\n")
		chapter_format+=(f"START={entry['start_time']}\n")
		chapter_format+=(f"END={entry['end_time']}\n")
		chapter_format+=(f"title={entry['title']}\n\n")

	return(chapter_format)