"use client";

import { useQueryState, parseAsStringLiteral } from "nuqs";
import { EventItem } from "./EventItem";
import { EventFilter } from "./EventFilter";
import {
  EventFragment,
  getSingularEvents,
  organizeEventsByDate,
} from "@/lib/event";
import { isTodayOrFuture } from "@/lib/date";
import styles from "./eventContainer.module.scss";
import { formatDate, formatYearMonth } from "@/lib/date";
import { getYear, parse } from "date-fns";

type EventContainerMode = "list" | "calendar";

export const EventContainer = ({ events }: { events: EventFragment[] }) => {
  const [mode, setMode] = useQueryState(
    "mode",
    parseAsStringLiteral(["list", "calendar"]).withDefault("list")
  );
  return (
    <div className={styles.events}>
      <EventFilter />
      <div className={styles.eventWrapper}>
        <div className={styles.displayOptions}>
          <button onClick={() => setMode(null)}>Vis liste</button>
          <button onClick={() => setMode("calendar")}>Vis kalender</button>
        </div>
        {mode === "list" && <EventList events={events} />}
        {mode === "calendar" && <EventCalendar events={events} />}
      </div>
    </div>
  );
};

const EventList = ({ events }: { events: EventFragment[] }) => {
  return (
    <ul className={styles.eventList}>
      {events.map((event) => (
        <EventItem key={event.id} event={event} mode="list" />
      ))}
    </ul>
  );
};

const EventCalendar = ({ events }: { events: EventFragment[] }) => {
  const futureSingularEvents = getSingularEvents(events).filter(
    (x) => x.occurrence?.start && isTodayOrFuture(x.occurrence.start)
  );

  const eventsByDate = organizeEventsByDate(futureSingularEvents);

  return (
    <div className={styles.eventCalendar}>
      {Object.keys(eventsByDate).map((yearMonth) => (
        <div key={yearMonth} className={styles.calendarYearMonth}>
          <h2>{formatYearMonth(yearMonth)}</h2>
          {Object.keys(eventsByDate[yearMonth]).map((week) => (
            <div key={week} className={styles.calendarWeek}>
              {Object.keys(eventsByDate[yearMonth][week]).map((day) => (
                <div
                  key={day}
                  className={`${styles.calendarDay} ${
                    eventsByDate[yearMonth][week][day].length === 0 &&
                    styles.empty
                  }`}
                >
                  <h3>
                    {formatDate(
                      parse(day, "yyyy-MM-dd", new Date()),
                      "eeee dd.MM."
                    )}
                  </h3>
                  <ul>
                    {eventsByDate[yearMonth][week][day].map((event) => (
                      <EventItem
                        key={event.id}
                        event={event}
                        mode="calendar"
                        size="small"
                      />
                    ))}
                  </ul>
                </div>
              ))}
            </div>
          ))}
        </div>
      ))}
    </div>
  );
};