// Home card: once a week, write what you remember of a passage you studied, then compare it with your notes.
import { useMemo, useState } from 'react';
import { useApp } from '../context/AppContext.js';
import { loadProjectById } from '../utils/projectStorage.js';
import { pickRecall } from '../utils/recall.js';

const RATE = [
  { id: 'solid', label: 'I had it' },
  { id: 'partly', label: 'Partly' },
  { id: 'forgot', label: 'Most of it slipped' },
];
const box = 'mb-4 rounded-xl border border-[var(--r-line)] bg-[var(--r-bar)] px-4 py-3 text-sm';
const noteLabels = [['observation', 'Observe'], ['interpretation', 'Interpret'], ['application', 'Apply']];

export default function WeeklyRecall() {
  const { projectIndex, saveChunkRecall, openStudyChunk } = useApp();
  const [step, setStep] = useState('card'); // card -> write -> compare -> done
  const [text, setText] = useState('');
  const [gaps, setGaps] = useState('');
  const pick = useMemo(
    () => pickRecall(projectIndex.map((e) => loadProjectById(e.id)).filter(Boolean)),
    [projectIndex],
  );
  if (step === 'done') return <div role="status" className={box}>Recall saved. See you next week.</div>;
  if (!pick) return null;

  const finish = (rating) => {
    saveChunkRecall(pick.projectId, pick.chunk.id, { at: Date.now(), text: text.trim(), rating, gaps: gaps.trim() });
    setStep('done');
  };

  if (step === 'card') {
    return (
      <div className={`${box} flex flex-wrap items-center justify-between gap-3`}>
        <span><span className="font-medium">Weekly recall:</span> {pick.reference} <span className="text-[var(--r-sub)]">· {pick.projectTitle}</span></span>
        <button type="button" onClick={() => 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="Weekly recall" className={box}>
      <p className="font-medium">{pick.reference} <span className="font-normal text-[var(--r-sub)]">· {pick.projectTitle}</span></p>
      {step === 'write' ? (
        <>
          <p className="mt-0.5 text-xs text-[var(--r-sub)]">From memory, no peeking: what did this passage say, what did it mean, and what did it ask of you?</p>
          <textarea aria-label="What you remember" value={text} onChange={(e) => setText(e.target.value)} rows={6}
            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" />
          <div className="mt-2 flex gap-2">
            <button type="button" disabled={!text.trim()} onClick={() => setStep('compare')} className="rounded-full bg-[var(--r-text)] px-3 py-1 text-xs font-medium text-[var(--r-bg)] disabled:opacity-40">Show my notes</button>
            <button type="button" onClick={() => { setText(''); setStep('card'); }} className="text-xs text-[var(--r-sub)] hover:underline">Not now</button>
          </div>
        </>
      ) : (
        <>
          <div className="mt-2 grid gap-3 sm:grid-cols-2">
            <div>
              <p className="mb-1 text-[11px] uppercase tracking-wide text-[var(--r-sub)]">What you remembered</p>
              <p className="whitespace-pre-line font-serif text-[13px] leading-relaxed">{text}</p>
            </div>
            <div>
              <p className="mb-1 text-[11px] uppercase tracking-wide text-[var(--r-sub)]">Your notes</p>
              {noteLabels.map(([f, label]) => pick.chunk[f]?.trim() && (
                <p key={f} className="mb-1.5 whitespace-pre-line font-serif text-[13px] leading-relaxed"><span className="font-sans text-xs font-medium">{label}: </span>{pick.chunk[f]}</p>
              ))}
            </div>
          </div>
          <label className="mt-3 block text-xs text-[var(--r-sub)]">What did you miss or get wrong? <span className="opacity-70">(one per line; collected in Insights)</span>
            <textarea aria-label="What slipped" value={gaps} onChange={(e) => setGaps(e.target.value)} rows={2}
              className="mt-1 w-full resize-y rounded-lg border border-[var(--r-line)] bg-[var(--r-bg)] px-2.5 py-1.5 text-sm text-[var(--r-text)] focus:outline-none" />
          </label>
          <p className="mt-3 text-xs text-[var(--r-sub)]">How did you do?</p>
          <div className="mt-1 flex flex-wrap gap-2">
            {RATE.map((r) => (
              <button key={r.id} type="button" onClick={() => finish(r.id)} className="rounded-full border border-[var(--r-text)] px-3 py-1 text-xs hover:bg-black/5">{r.label}</button>
            ))}
            <button type="button" onClick={() => openStudyChunk(pick.projectId, pick.chunk.id)} className="text-xs text-[var(--r-accent)] hover:underline">Open this chunk to review</button>
          </div>
        </>
      )}
    </section>
  );
}