import { useState } from 'react';
import type { Calendar, Campaign } from '@/lib/schemas';
import { calendarRepo } from '@/lib/db/repositories';
import { newId } from '@/lib/ids';
import { useCalendar } from './hooks';
import { Page, PageHeader, RequireCampaign } from '@/components/ui/Page';
import { Button } from '@/components/ui/Button';
import { Input } from '@/components/ui/Input';

export function CalendarPage() {
  return <RequireCampaign>{(c) => <CalendarView campaign={c} />}</RequireCampaign>;
}

function CalendarView({ campaign }: { campaign: Campaign }) {
  const stored = useCalendar(campaign.id);
  const [eventTitle, setEventTitle] = useState('');

  // The row is created on first save; until then we work with an in-memory default.
  const calendar: Calendar = stored ?? { campaignId: campaign.id, currentDay: 0, events: [] };

  const save = (next: Calendar) => void calendarRepo.save(next);
  const advance = (delta: number) => save({ ...calendar, currentDay: calendar.currentDay + delta });
  const addEvent = () => {
    if (eventTitle.trim() === '') return;
    save({ ...calendar, events: [...calendar.events, { id: newId(), day: calendar.currentDay, title: eventTitle.trim() }] });
    setEventTitle('');
  };

  const upcoming = [...calendar.events].sort((a, b) => a.day - b.day);

  return (
    <Page>
      <PageHeader title="Calendar" subtitle={`${campaign.name} · in-world timeline`} />

      <div className="mb-6 flex items-center gap-3 rounded-lg border border-line bg-panel p-4">
        <Button variant="secondary" onClick={() => advance(-1)} aria-label="Previous day">−1 day</Button>
        <div className="text-center">
          <div className="text-xs uppercase tracking-wide text-muted">Day</div>
          <div className="font-display text-3xl font-bold text-accent">{calendar.currentDay}</div>
        </div>
        <Button variant="secondary" onClick={() => advance(1)} aria-label="Next day">+1 day</Button>
        <Button variant="ghost" onClick={() => advance(7)}>+1 week</Button>
      </div>

      <div className="mb-3 flex gap-2">
        <Input value={eventTitle} onChange={(e) => setEventTitle(e.target.value)} onKeyDown={(e) => e.key === 'Enter' && addEvent()} placeholder={`Add event on day ${calendar.currentDay}…`} aria-label="Event title" />
        <Button variant="primary" onClick={addEvent}>Add event</Button>
      </div>

      {upcoming.length === 0 ? (
        <p className="text-sm text-muted">No events yet.</p>
      ) : (
        <ul className="space-y-1">
          {upcoming.map((ev) => (
            <li key={ev.id} className="flex items-center gap-3 rounded-md border border-line bg-panel px-3 py-2 text-sm">
              <span className={'w-16 shrink-0 font-mono ' + (ev.day === calendar.currentDay ? 'text-accent' : 'text-muted')}>Day {ev.day}</span>
              <span className="flex-1 text-ink">{ev.title}</span>
              <button className="text-muted hover:text-danger" onClick={() => save({ ...calendar, events: calendar.events.filter((e) => e.id !== ev.id) })} aria-label={`Remove ${ev.title}`}>✕</button>
            </li>
          ))}
        </ul>
      )}
    </Page>
  );
}
