import { useState, useId } from 'react';
import { VOCAB, collectionDisplayName } from '../../lib/collection-vocabulary.js';
import { Button } from '../ui';

const GAMES = [
  { value: 'All', label: 'Auto-detect' },
  { value: 'mtg', label: 'Magic' },
  { value: 'pokemon', label: 'Pokémon' },
  { value: 'lorcana', label: 'Lorcana' },
];

const DECK_SIZES = [
  { value: 40, label: '40' },
  { value: 60, label: '60' },
  { value: 99, label: '99' },
];

const DESTINATION_TYPES = [
  { value: 'owned', label: VOCAB.MY_COLLECTION },
  { value: 'collection', label: VOCAB.LIST },
  { value: 'deck', label: 'Deck' },
];

function ToggleGroup({ options, value, onChange, name, className = '' }) {
  return (
    <div className={`inline-flex rounded-xl overflow-hidden ${className}`} role="radiogroup" aria-label={name}>
      {options.map((opt) => {
        const selected = opt.value === value;
        return (
          <button
            key={opt.value}
            type="button"
            role="radio"
            aria-checked={selected}
            onClick={() => onChange(opt.value)}
            className="px-4 py-2.5 text-sm font-medium transition-colors duration-150 focus:outline-none focus-visible:ring-2 focus-visible:ring-inset min-w-[44px] min-h-[44px] flex items-center justify-center"
            style={{
              backgroundColor: selected ? 'var(--accent-ember)' : 'var(--bg-tertiary)',
              color: selected ? '#ffffff' : 'var(--text-secondary)',
              '--tw-ring-color': 'var(--accent-ember)',
            }}
          >
            {opt.label}
          </button>
        );
      })}
    </div>
  );
}

function ScanHistoryList({ history }) {
  const [expanded, setExpanded] = useState(false);
  const panelId = useId();

  if (!history || history.length === 0) return null;

  const formatDate = (iso) => {
    try {
      return new Date(iso).toLocaleDateString(undefined, {
        month: 'short',
        day: 'numeric',
        hour: 'numeric',
        minute: '2-digit',
      });
    } catch {
      return 'Unknown date';
    }
  };

  const destinationLabel = (dest) => {
    if (!dest) return 'Unknown';
    if (dest.type === 'owned') return VOCAB.MY_COLLECTION;
    return dest.label || dest.type;
  };

  return (
    <div className="mt-6">
      <button
        type="button"
        onClick={() => setExpanded((v) => !v)}
        aria-expanded={expanded}
        aria-controls={panelId}
        className="flex items-center gap-2 text-sm font-medium w-full py-2 focus:outline-none focus-visible:ring-2 rounded-lg px-1 min-h-[44px]"
        style={{
          color: 'var(--text-secondary)',
          '--tw-ring-color': 'var(--accent-ember)',
        }}
      >
        <svg
          width="16"
          height="16"
          viewBox="0 0 16 16"
          fill="none"
          aria-hidden="true"
          className="transition-transform duration-200"
          style={{ transform: expanded ? 'rotate(90deg)' : 'rotate(0deg)' }}
        >
          <path d="M6 4l4 4-4 4" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round" strokeLinejoin="round" />
        </svg>
        Recent Sessions
      </button>

      {expanded && (
        <ul id={panelId} className="mt-2 space-y-2">
          {history.map((entry, i) => (
            <li
              key={entry.date || i}
              className="flex items-center justify-between rounded-lg px-3 py-2.5 text-sm"
              style={{ backgroundColor: 'var(--bg-tertiary)' }}
            >
              <div className="flex flex-col gap-0.5">
                <span style={{ color: 'var(--text-primary)' }}>
                  {entry.cardCount} {entry.cardCount === 1 ? 'card' : 'cards'}
                </span>
                <span className="text-xs" style={{ color: 'var(--text-secondary)' }}>
                  {destinationLabel(entry.destination)}
                  {entry.game && entry.game !== 'All' ? ` · ${entry.game}` : ''}
                </span>
              </div>
              <span className="text-xs tabular-nums" style={{ color: 'var(--text-tertiary)' }}>
                {formatDate(entry.date)}
              </span>
            </li>
          ))}
        </ul>
      )}
    </div>
  );
}

export default function ScannerSetup({
  sessionDestination,
  onDestinationChange,
  gameFilter,
  onGameFilterChange,
  collections,
  decks,
  deckMode,
  onDeckModeChange,
  onStartScanning,
  scanHistory,
}) {
  const destSelectId = useId();
  const gameGroupId = useId();
  const deckModeId = useId();
  const deckSizeId = useId();

  const destinationType = sessionDestination?.type ?? 'owned';

  const handleDestinationTypeChange = (type) => {
    if (type === 'owned') {
      onDestinationChange({ type: 'owned', id: null, label: VOCAB.MY_COLLECTION });
    } else if (type === 'collection') {
      const first = collections?.[0];
      onDestinationChange(
        first
          ? { type: 'collection', id: first.id, label: collectionDisplayName(first) }
          : { type: 'collection', id: null, label: VOCAB.LIST }
      );
    } else if (type === 'deck') {
      const first = decks?.[0];
      onDestinationChange(
        first
          ? { type: 'deck', id: first.id, label: first.name }
          : { type: 'deck', id: null, label: 'Deck' }
      );
    }
  };

  const handleListSelect = (e) => {
    const id = parseInt(e.target.value, 10);
    const found = collections.find((c) => c.id === id);
    if (found) {
      onDestinationChange({
        type: 'collection',
        id: found.id,
        label: collectionDisplayName(found),
      });
    }
  };

  const handleDeckSelect = (e) => {
    const id = parseInt(e.target.value, 10);
    const found = decks.find((d) => d.id === id);
    if (found) {
      onDestinationChange({ type: 'deck', id: found.id, label: found.name });
    }
  };

  const handleDeckModeToggle = () => {
    if (deckMode) {
      onDeckModeChange(null);
    } else {
      onDeckModeChange({ game: gameFilter, targetSize: 60 });
    }
  };

  const handleDeckSizeChange = (size) => {
    onDeckModeChange({ ...deckMode, targetSize: size });
  };

  const selectStyle = {
    backgroundColor: 'var(--bg-tertiary)',
    color: 'var(--text-primary)',
    borderColor: 'var(--border)',
  };

  return (
    <div className="px-4 sm:px-6 py-6 max-w-lg mx-auto">
      <div className="glass-panel rounded-2xl p-5 sm:p-6 space-y-6">
        <header>
          <h1
            className="text-xl sm:text-2xl font-semibold"
            style={{ color: 'var(--text-primary)' }}
          >
            Card Scanner
          </h1>
          <p className="mt-1 text-sm" style={{ color: 'var(--text-secondary)' }}>
            Choose where scanned cards will go
          </p>
        </header>

        {/* Destination picker */}
        <fieldset>
          <legend className="text-sm font-medium mb-2" style={{ color: 'var(--text-primary)' }}>
            Destination
          </legend>
          <ToggleGroup
            options={DESTINATION_TYPES}
            value={destinationType}
            onChange={handleDestinationTypeChange}
            name="Scan destination"
            className="w-full"
          />

          {destinationType === 'collection' && (
            <div className="mt-3">
              <label htmlFor={destSelectId} className="sr-only">
                Choose a list
              </label>
              <select
                id={destSelectId}
                value={sessionDestination?.id ?? ''}
                onChange={handleListSelect}
                className="w-full rounded-lg border px-3 py-2.5 text-sm focus:outline-none focus-visible:ring-2 min-h-[44px]"
                style={{
                  ...selectStyle,
                  '--tw-ring-color': 'var(--accent-ember)',
                }}
              >
                {(!collections || collections.length === 0) && (
                  <option value="" disabled>
                    No lists available
                  </option>
                )}
                {collections?.map((c) => (
                  <option key={c.id} value={c.id}>
                    {collectionDisplayName(c)}
                  </option>
                ))}
              </select>
            </div>
          )}

          {destinationType === 'deck' && (
            <div className="mt-3">
              <label htmlFor={destSelectId} className="sr-only">
                Choose a deck
              </label>
              <select
                id={destSelectId}
                value={sessionDestination?.id ?? ''}
                onChange={handleDeckSelect}
                className="w-full rounded-lg border px-3 py-2.5 text-sm focus:outline-none focus-visible:ring-2 min-h-[44px]"
                style={{
                  ...selectStyle,
                  '--tw-ring-color': 'var(--accent-ember)',
                }}
              >
                {(!decks || decks.length === 0) && (
                  <option value="" disabled>
                    No decks available
                  </option>
                )}
                {decks?.map((d) => (
                  <option key={d.id} value={d.id}>
                    {d.name}
                  </option>
                ))}
              </select>
            </div>
          )}
        </fieldset>

        {/* Game filter */}
        <fieldset>
          <legend
            id={gameGroupId}
            className="text-sm font-medium mb-2"
            style={{ color: 'var(--text-primary)' }}
          >
            Game
          </legend>
          <ToggleGroup
            options={GAMES}
            value={gameFilter}
            onChange={onGameFilterChange}
            name="Game filter"
            className="w-full"
          />
        </fieldset>

        {/* Deck mode toggle */}
        <div className="flex items-center justify-between gap-3 py-1">
          <label
            htmlFor={deckModeId}
            className="text-sm font-medium cursor-pointer select-none"
            style={{ color: 'var(--text-primary)' }}
          >
            Deck Mode
          </label>
          <button
            id={deckModeId}
            type="button"
            role="switch"
            aria-checked={Boolean(deckMode)}
            onClick={handleDeckModeToggle}
            className="relative inline-flex h-7 w-12 shrink-0 rounded-full transition-colors duration-200 focus:outline-none focus-visible:ring-2 focus-visible:ring-offset-2"
            style={{
              backgroundColor: deckMode ? 'var(--accent-ember)' : 'var(--bg-tertiary)',
              '--tw-ring-color': 'var(--accent-ember)',
              '--tw-ring-offset-color': 'transparent',
            }}
          >
            <span
              aria-hidden="true"
              className="pointer-events-none inline-block h-5 w-5 rounded-full shadow-sm transition-transform duration-200"
              style={{
                backgroundColor: '#ffffff',
                transform: deckMode ? 'translate(22px, 4px)' : 'translate(4px, 4px)',
              }}
            />
          </button>
        </div>

        {deckMode && (
          <fieldset className="pl-1">
            <legend
              id={deckSizeId}
              className="text-sm font-medium mb-2"
              style={{ color: 'var(--text-primary)' }}
            >
              Deck Size
            </legend>
            <ToggleGroup
              options={DECK_SIZES}
              value={deckMode.targetSize}
              onChange={handleDeckSizeChange}
              name="Deck size"
            />
          </fieldset>
        )}

        {/* Start scanning CTA */}
        <Button
          variant="primary"
          size="lg"
          onClick={onStartScanning}
          className="w-full"
        >
          Start Scanning
        </Button>

        {/* Scan history */}
        <ScanHistoryList history={scanHistory} />
      </div>
    </div>
  );
}