// Home card: your five minutes for today. A short prompt on a passage from your studies, a five-minute clock, and a
// box to write in. What you write is added to that passage's notes. Pasting is turned off here on purpose.
import { useEffect, useMemo, useRef, useState } from 'react';
import { useApp } from '../context/AppContext.js';
import { loadProjectById } from '../utils/projectStorage.js';
import { FIELD_NAMES, MINUTES, dailyPatch, pickDaily } from '../utils/dailyFive.js';
import { formatClock } from '../utils/present.js';

const box = 'mb-4 rounded-xl border border-[var(--r-line)] bg-[var(--r-bar)] px-4 py-3 text-sm';

export default function DailyFive() {
  const { projectIndex, saveChunkPatch } = useApp();
  const [step, setStep] = useState('card'); // card -> write -> done
  const [text, setText] = useState('');
  const [left, setLeft] = useState(MINUTES * 60);
  const [pasteTried, setPasteTried] = useState(false);
  const pick = useMemo(() => pickDaily(projectIndex.map((e) => loadProjectById(e.id)).filter(Boolean)), [projectIndex]);
  const started = useRef(null);

  useEffect(() => {
    if (step !== 'write') return undefined;
    started.current = Date.now();
    const t = window.setInterval(() => setLeft(Math.max(0, MINUTES * 60 - Math.round((Date.now() - started.current) / 1000))), 1000);
    return () => window.clearInterval(t);
  }, [step]);

  if (step === 'done') return <div role="status" className={box}>Saved to your notes. Same time tomorrow.</div>;
  if (!pick) return null;
  const { prompt } = pick;

  const save = () => {
    saveChunkPatch(pick.projectId, pick.chunk.id, dailyPatch(pick.chunk, prompt.field, text));
    setStep('done');
  };

  if (step === 'card') {
    return (
      <div className={`${box} flex flex-wrap items-center justify-between gap-3`}>
        <span><span className="font-medium">Your five minutes:</span> {pick.reference} <span className="text-[var(--r-sub)]">· {FIELD_NAMES[prompt.field]} · {pick.projectTitle}</span></span>
        <button type="button" onClick={() => { setText(''); setLeft(MINUTES * 60); setPasteTried(false); setStep('write'); }} className="rounded-full bg-[var(--r-text)] px-3 py-1 text-xs font-medium text-[var(--r-bg)]">Start</button>
      </div>
    );
  }
  return (
    <section aria-label="Your five minutes" className={box}>
      <div className="flex items-baseline justify-between gap-3">
        <p className="font-medium">{pick.reference} <span className="font-normal text-[var(--r-sub)]">· {FIELD_NAMES[prompt.field]}</span></p>
        <span role="timer" aria-label="Time left" className={`font-mono text-sm tabular-nums ${left === 0 ? 'text-[var(--r-accent)]' : 'text-[var(--r-sub)]'}`}>{left === 0 ? 'Time’s up, finish your thought' : formatClock(left)}</span>
      </div>
      {pick.verses.length > 0 && (
        <div className="mt-2 max-h-40 overflow-y-auto rounded-lg bg-[var(--r-bg)] p-3 font-serif text-[13px] leading-relaxed">
          {pick.verses.map((v) => <p key={v.number}><sup className="mr-1 font-sans text-[var(--r-accent)]">{v.number}</sup>{v.text}</p>)}
        </div>
      )}
      <p className="mt-2 text-xs text-[var(--r-sub)]">{prompt.text}</p>
      <textarea aria-label="Your five minutes" value={text} onChange={(e) => setText(e.target.value)} rows={6} autoFocus
        onPaste={(e) => { e.preventDefault(); setPasteTried(true); }}
        className="mt-2 w-full resize-y rounded-xl border border-[var(--r-line)] bg-[var(--r-bg)] px-3 py-2 font-serif text-[15px] leading-7 focus:outline-none" />
      {pasteTried && <p role="note" className="mt-1 text-xs text-[var(--r-accent)]">Pasting is off here. Type it in your own words; that’s what the five minutes are for.</p>}
      <div className="mt-2 flex gap-2">
        <button type="button" disabled={!text.trim()} onClick={save} className="rounded-full bg-[var(--r-text)] px-3 py-1 text-xs font-medium text-[var(--r-bg)] disabled:opacity-40">Save to my notes</button>
        <button type="button" onClick={() => setStep('card')} className="text-xs text-[var(--r-sub)] hover:underline">Not now</button>
      </div>
    </section>
  );
}