// "Your reading": how much of the Bible you have read (every chapter you spent time on in the Reader, plus the
// ones you finished in reading plans), a tile for each book that fills as you read it, and a calendar of the
// days you read in the last six months.
import { useMemo } from 'react';
import { getPlanSchedule } from '../utils/readingPlans.js';
import { heatmapWeeks, planChapterKeys, progressSummary } from '../utils/readingHistory.js';

const pct = (n) => `${Math.round(n * 100)}%`;

export default function ReadingProgress({ history, planProgress = [], activity = [], onOpenBook }) {
  const summary = useMemo(() => progressSummary(history, planChapterKeys(planProgress, getPlanSchedule)), [history, planProgress]);
  const days = useMemo(() => new Set([...(history.days ?? []), ...activity]), [history.days, activity]);
  const weeks = useMemo(() => heatmapWeeks(days), [days]);
  const daysInView = weeks.flat().filter((d) => d.on).length;
  const group = (list) => (
    <div className="grid grid-cols-[repeat(auto-fill,minmax(5.5rem,1fr))] gap-1.5">
      {list.map((b) => (
        <button key={b.abbrev} type="button" onClick={() => onOpenBook?.(b.abbrev)} title={`${b.name}: ${b.read} of ${b.total} chapters read`}
          aria-label={`${b.name}, ${b.read} of ${b.total} chapters read`}
          className="relative overflow-hidden rounded-lg border border-[var(--r-line)] px-2 py-1.5 text-left text-xs hover:border-[var(--r-accent)]">
          <span aria-hidden="true" className="absolute inset-y-0 left-0 bg-[var(--r-accent)] opacity-25" style={{ width: pct(b.pct) }} />
          <span className="relative block truncate font-medium">{b.name}</span>
          <span className="relative block text-[10px] text-[var(--r-sub)]">{b.read}/{b.total}</span>
        </button>
      ))}
    </div>
  );

  return (
    <section aria-label="Your reading" className="rounded-2xl border border-[var(--r-line)] bg-[var(--r-bar)] p-5">
      <div className="flex flex-wrap items-baseline justify-between gap-2">
        <h2 className="text-sm font-medium">Your reading</h2>
        <p className="text-xs text-[var(--r-sub)]">
          <span className="text-base font-medium text-[var(--r-text)]">{pct(summary.pct)}</span> of the Bible · {summary.read} of {summary.total} chapters
        </p>
      </div>
      <div className="mt-2 h-1.5 overflow-hidden rounded-full bg-[var(--r-line)]" role="progressbar" aria-valuemin={0} aria-valuemax={100} aria-valuenow={Math.round(summary.pct * 100)} aria-label="Bible read">
        <div className="h-full bg-[var(--r-accent)]" style={{ width: pct(summary.pct) }} />
      </div>
      <p className="mt-1.5 text-[11px] text-[var(--r-sub)]">Old Testament {summary.ot.read}/{summary.ot.total} · New Testament {summary.nt.read}/{summary.nt.total}. A chapter counts once you’ve had it open for a bit in the Reader, or finished it in a plan.</p>

      <h3 className="mb-1.5 mt-4 text-[11px] uppercase tracking-wide text-[var(--r-sub)]">Old Testament</h3>
      {group(summary.books.filter((b) => b.testament === 'ot'))}
      <h3 className="mb-1.5 mt-4 text-[11px] uppercase tracking-wide text-[var(--r-sub)]">New Testament</h3>
      {group(summary.books.filter((b) => b.testament === 'nt'))}

      <h3 className="mb-1.5 mt-4 text-[11px] uppercase tracking-wide text-[var(--r-sub)]">Days you read · {daysInView} in the last 6 months</h3>
      <div className="flex gap-[3px] overflow-x-auto pb-1" role="img" aria-label={`${daysInView} days read in the last six months`}>
        {weeks.map((week) => (
          <div key={week[0].date} className="flex flex-col gap-[3px]">
            {week.map((d) => (
              <span key={d.date} title={d.future ? '' : `${d.date}${d.on ? ': read' : ''}`}
                className={`h-3 w-3 rounded-[3px] ${d.future ? 'opacity-0' : d.on ? 'bg-[var(--r-accent)]' : 'bg-[var(--r-line)]'}`} />
            ))}
          </div>
        ))}
      </div>
    </section>
  );
}