import feedparser
from typing import List, Tuple, Optional
from datetime import datetime
import requests
import json

KSP_URL = "https://ksp.mff.cuni.cz"

def task_link(task_code: str, solution : bool = False):
    return f"{KSP_URL}/viz/{task_code}/{'reseni' if solution else ''}"

def catalog(year : Optional[int] = None, tasks : bool = False):
    year_str = ""
    if year is not None:
        year_str = f"year={year}"
    tasks_str = f"tasks={str(tasks).lower()}"

    page = requests.get(f"{KSP_URL}/api/tasks/catalog?{year_str}&{tasks_str}")
    return json.loads(page.text)

def active_deadlines() -> List[Tuple[str, datetime]]:
    deadlines = []
    now = datetime.now().astimezone()
    cat = catalog()
    for series in cat:
        series_deadlines = [series["deadline"]]
        if "deadline2" in series:
            series_deadlines.append(series["deadline2"])
        series_deadlines = list(map(datetime.fromisoformat, series_deadlines))

        for series_deadline in series_deadlines:
            if now < series_deadline:
                deadlines.append((series["id"], series_deadline))
                break
    
    return deadlines

async def ksp_feed() -> feedparser.util.FeedParserDict:
    return feedparser.parse(f"{KSP_URL}/ksp.feed")