/* eslint-disable @next/next/no-img-element -- External card thumbnails; next/image migration is out of scope. */
import { useRef } from 'react';
import { VOCAB } from '../../lib/collection-vocabulary.js';
import Button from '../ui/Button.js';
import GlassSurface from '../ui/GlassSurface.js';

export const TAB_RECENT = 'recent';
export const TAB_QUEUE = 'queue';
export const TAB_DUPLICATES = 'duplicates';

const EMPTY_COPY = {
  [TAB_RECENT]: 'No scans yet this session.',
  [TAB_QUEUE]: 'Scan queue is empty — matches appear here before you add them.',
  [TAB_DUPLICATES]: 'No duplicates detected.',
};

export function getDuplicateCards(scannedCards, ownershipMap) {
  const sessionRepeatIds = new Set();
  const seen = new Map();
  for (const card of scannedCards) {
    const key = `${card.name}::${card.set}`;
    if (seen.has(key)) sessionRepeatIds.add(card.id);
    else seen.set(key, card.id);
    if ((card.quantity || 1) > 1) sessionRepeatIds.add(card.id);
  }
  return scannedCards.filter(
    (card) =>
      sessionRepeatIds.has(card.id) ||
      (card.databaseId && ownershipMap[card.databaseId])
  );
}

function queueTabAriaLabel(count) {
  if (count === 0) return 'Scan Queue';
  if (count === 1) return 'Scan Queue, 1 unprocessed card';
  return `Scan Queue, ${count} unprocessed cards`;
}

function duplicatesTabAriaLabel(count) {
  if (count === 0) return 'Duplicates';
  if (count === 1) return 'Duplicates, 1 duplicate card';
  return `Duplicates, ${count} duplicate cards`;
}

function HistoryChip({ card, isFocused, onFocus }) {
  const isFailed = Boolean(card.identifyFailed);

  return (
    <button
      type="button"
      onClick={() => onFocus(card.id)}
      className="flex-shrink-0 flex items-center gap-2 rounded-xl px-3 py-2 min-h-[44px] cursor-pointer transition-shadow duration-150 hover:shadow-[var(--rim-light-inner),var(--ember-rim-subtle)] focus:outline-none focus-visible:ring-2 focus-visible:ring-offset-2"
      style={{
        backgroundColor: 'var(--bg-secondary)',
        border: '1px solid var(--border)',
        borderLeft: isFailed ? '3px solid var(--accent-ember)' : undefined,
        opacity: card.processed ? 0.65 : 1,
        boxShadow: isFocused
          ? 'var(--rim-light-inner), var(--ember-rim-pronounced)'
          : undefined,
        '--tw-ring-color': 'var(--accent-ember)',
        '--tw-ring-offset-color': 'transparent',
      }}
      aria-current={isFocused ? 'true' : undefined}
    >
      {card.image_url ? (
        <img
          src={card.image_url}
          alt=""
          className="h-10 w-7 rounded object-cover flex-shrink-0"
        />
      ) : (
        <div
          className="h-10 w-7 rounded flex-shrink-0"
          style={{ backgroundColor: 'var(--bg-primary)' }}
          aria-hidden="true"
        />
      )}
      <div className="min-w-0 text-left">
        <div
          className="text-sm font-medium truncate"
          style={{ color: 'var(--text-primary)' }}
        >
          {card.name}
        </div>
        {isFailed && (
          <div className="text-xs font-medium" style={{ color: 'var(--accent-ember)' }}>
            Identify failed
          </div>
        )}
        {isFailed && card.identifyFailureReason && (
          <div className="text-sm truncate" style={{ color: 'var(--text-secondary)' }}>
            {card.identifyFailureReason}
          </div>
        )}
        {!isFailed && card.set && (
          <div className="text-xs truncate" style={{ color: 'var(--text-secondary)' }}>
            {card.set}
          </div>
        )}
      </div>
      {(card.quantity || 1) > 1 && (
        <span
          className="text-xs font-semibold rounded-full px-2 py-0.5 flex-shrink-0"
          style={{
            backgroundColor: 'var(--bg-primary)',
            color: 'var(--text-secondary)',
          }}
        >
          ×{card.quantity}
        </span>
      )}
    </button>
  );
}

function BatchProgressBanner({ batchProgress }) {
  if (!batchProgress?.active) return null;

  const { current, total, onCancel } = batchProgress;
  const percent = total > 0 ? Math.round((current / total) * 100) : 0;

  return (
    <div
      className="mb-3 rounded-xl px-4 py-3"
      style={{ backgroundColor: 'var(--bg-secondary)' }}
      aria-live="polite"
    >
      <div className="flex items-center justify-between gap-3 mb-2">
        <span className="text-sm font-medium" style={{ color: 'var(--text-primary)' }}>
          Scanning {current} of {total}…
        </span>
        <Button variant="ghost" size="sm" onClick={onCancel}>
          Cancel
        </Button>
      </div>
      <div
        className="h-2 rounded-full overflow-hidden"
        style={{ backgroundColor: 'var(--bg-primary)' }}
        role="progressbar"
        aria-valuenow={current}
        aria-valuemin={0}
        aria-valuemax={total}
        aria-label={`Scanning ${current} of ${total}`}
      >
        <div
          className="h-full rounded-full transition-[width] duration-200 motion-reduce:transition-none"
          style={{
            width: `${percent}%`,
            background:
              'linear-gradient(90deg, var(--accent-ember) 0%, var(--accent-flame) 100%)',
          }}
        />
      </div>
    </div>
  );
}

export default function ScannerHistoryStrip({
  scannedCards,
  ownershipMap,
  focusedCardId,
  onFocusCard,
  activeTab,
  onTabChange,
  batchProgress = null,
  onClearAll,
  onCommitSelectedToOwned,
  onOpenListPicker,
  isProcessing = false,
}) {
  const chipScrollerRef = useRef(null);

  const unprocessedCards = scannedCards.filter((card) => !card.processed);
  const duplicateCards = getDuplicateCards(scannedCards, ownershipMap || {});
  const recentCards = [...scannedCards].reverse();

  const tabCards = {
    [TAB_RECENT]: recentCards,
    [TAB_QUEUE]: unprocessedCards,
    [TAB_DUPLICATES]: duplicateCards,
  };

  const visibleCards = tabCards[activeTab] ?? [];

  const handleViewAllScans = () => {
    const scroller = chipScrollerRef.current;
    if (scroller) {
      scroller.scrollLeft = scroller.scrollWidth;
    }
  };

  const tabs = [
    {
      id: TAB_RECENT,
      label: 'Recent Scans',
      badge: null,
      ariaLabel: 'Recent Scans',
    },
    {
      id: TAB_QUEUE,
      label: 'Scan Queue',
      badge: unprocessedCards.length,
      ariaLabel: queueTabAriaLabel(unprocessedCards.length),
    },
    {
      id: TAB_DUPLICATES,
      label: 'Duplicates',
      badge: duplicateCards.length,
      ariaLabel: duplicatesTabAriaLabel(duplicateCards.length),
    },
  ];

  return (
    <GlassSurface tint="mid" className="rounded-2xl p-4 w-full">
      <div className="flex items-center justify-between gap-4 mb-3">
        <div role="tablist" aria-label="Scan history" className="flex gap-1 flex-wrap">
          {tabs.map((tab) => {
            const isSelected = activeTab === tab.id;
            return (
              <button
                key={tab.id}
                type="button"
                role="tab"
                id={`tab-${tab.id}`}
                aria-selected={isSelected}
                aria-controls={`panel-${tab.id}`}
                aria-label={tab.ariaLabel}
                onClick={() => onTabChange(tab.id)}
                className="relative px-3 py-2 text-sm font-medium rounded-lg transition-colors duration-150 focus:outline-none focus-visible:ring-2 focus-visible:ring-offset-2"
                style={{
                  color: isSelected ? 'var(--accent-ember)' : 'var(--text-secondary)',
                  backgroundColor: isSelected
                    ? 'color-mix(in srgb, var(--accent-ember) 12%, transparent)'
                    : 'transparent',
                  boxShadow: isSelected
                    ? 'inset 0 -2px 0 var(--accent-ember)'
                    : undefined,
                  '--tw-ring-color': 'var(--accent-ember)',
                  '--tw-ring-offset-color': 'transparent',
                }}
              >
                <span aria-hidden="true">
                  {tab.label}
                  {tab.badge != null && tab.badge > 0 && (
                    <span
                      className="ml-1.5 inline-flex items-center justify-center min-w-[1.25rem] h-5 px-1 rounded-full text-xs font-semibold"
                      style={{
                        backgroundColor:
                          'color-mix(in srgb, var(--accent-ember) 18%, var(--bg-secondary))',
                        color: 'var(--accent-ember)',
                      }}
                    >
                      {tab.badge}
                    </span>
                  )}
                </span>
              </button>
            );
          })}
        </div>

        <button
          type="button"
          onClick={onClearAll}
          disabled={batchProgress?.active}
          className="text-sm font-medium whitespace-nowrap transition-opacity duration-150 focus:outline-none focus-visible:ring-2 focus-visible:ring-offset-2 disabled:opacity-50 disabled:cursor-not-allowed"
          style={{
            color: 'var(--accent-ember)',
            '--tw-ring-color': 'var(--accent-ember)',
            '--tw-ring-offset-color': 'transparent',
          }}
        >
          Clear All
        </button>
      </div>

      {tabs.map((tab) => (
        <div
          key={tab.id}
          role="tabpanel"
          id={`panel-${tab.id}`}
          aria-labelledby={`tab-${tab.id}`}
          hidden={activeTab !== tab.id}
        >
          {tab.id === TAB_QUEUE && <BatchProgressBanner batchProgress={batchProgress} />}

          {visibleCards.length === 0 && activeTab === tab.id ? (
            <p
              className="text-sm py-4 text-center"
              style={{ color: 'var(--text-secondary)' }}
            >
              {EMPTY_COPY[tab.id]}
            </p>
          ) : activeTab === tab.id ? (
            <div
              ref={chipScrollerRef}
              className="flex gap-2 overflow-x-auto pb-1 min-h-[44px]"
              style={{ WebkitOverflowScrolling: 'touch' }}
            >
              {visibleCards.map((card) => (
                <HistoryChip
                  key={card.id}
                  card={card}
                  isFocused={focusedCardId === card.id}
                  onFocus={onFocusCard}
                />
              ))}
            </div>
          ) : null}

          {tab.id === TAB_QUEUE && activeTab === TAB_QUEUE && unprocessedCards.length > 0 && (
            <div className="flex flex-wrap gap-2 mt-3 pt-3 border-t" style={{ borderColor: 'var(--border)' }}>
              <Button
                variant="primary"
                size="sm"
                loading={isProcessing}
                disabled={isProcessing}
                onClick={onCommitSelectedToOwned}
              >
                {VOCAB.ADD_TO_MY_COLLECTION}
              </Button>
              <Button
                variant="secondary"
                size="sm"
                disabled={isProcessing}
                onClick={onOpenListPicker}
              >
                {VOCAB.ADD_TO_LIST}
              </Button>
            </div>
          )}
        </div>
      ))}

      <div className="mt-3 flex justify-center">
        <Button variant="ghost" size="sm" onClick={handleViewAllScans}>
          View All Scans
        </Button>
      </div>
    </GlassSurface>
  );
}