'use client';

import React, { useState, useRef, useEffect } from 'react';
import { Trophy, Award, Check, Zap, Settings, Globe, Medal, Plus, Minus, RotateCcw, HelpCircle, X } from 'lucide-react';
import { createPortal } from 'react-dom';
import type { LeagueScoringPresetViewModel } from '@/lib/view-models/LeagueScoringPresetViewModel';
import type { LeagueConfigFormModel } from '@/lib/types/LeagueConfigFormModel';
import type { CustomPointsConfig } from '@/lib/view-models/ScoringConfigurationViewModel';
import { Box } from '@/ui/Box';
import { Text } from '@/ui/Text';
import { Stack } from '@/ui/Stack';
import { Heading } from '@/ui/Heading';
import { Grid } from '@/ui/Grid';
import { Surface } from '@/ui/Surface';
import { Button } from '@/ui/Button';
import { Icon } from '@/ui/Icon';

// ============================================================================
// INFO FLYOUT COMPONENT
// ============================================================================

interface InfoFlyoutProps {
  isOpen: boolean;
  onClose: () => void;
  title: string;
  children: React.ReactNode;
  anchorRef: React.RefObject<HTMLElement>;
}

function InfoFlyout({ isOpen, onClose, title, children, anchorRef }: InfoFlyoutProps) {
  const [position, setPosition] = useState({ top: 0, left: 0 });
  const [mounted, setMounted] = useState(false);
  const flyoutRef = useRef<HTMLDivElement>(null);

  useEffect(() => {
    setMounted(true);
  }, []);

  useEffect(() => {
    if (isOpen && anchorRef.current && mounted) {
      const rect = anchorRef.current.getBoundingClientRect();
      const flyoutWidth = Math.min(380, window.innerWidth - 40);
      const flyoutHeight = 450;
      const padding = 16;
      
      // Try to position to the right first
      let left = rect.right + 12;
      let top = rect.top;
      
      // If goes off right edge, try left side
      if (left + flyoutWidth > window.innerWidth - padding) {
        left = rect.left - flyoutWidth - 12;
      }
      
      // If still off screen (left side), center horizontally
      if (left < padding) {
        left = Math.max(padding, (window.innerWidth - flyoutWidth) / 2);
      }
      
      // Vertical positioning - try to center on button, but stay in viewport
      top = rect.top - flyoutHeight / 3;
      
      // Adjust if goes off bottom edge
      if (top + flyoutHeight > window.innerHeight - padding) {
        top = window.innerHeight - flyoutHeight - padding;
      }
      
      // Ensure not above viewport
      if (top < padding) top = padding;
      
      // Final bounds check
      left = Math.max(padding, Math.min(left, window.innerWidth - flyoutWidth - padding));
      
      setPosition({ top, left });
    }
  }, [isOpen, anchorRef, mounted]);

  useEffect(() => {
    const handleEscape = (e: KeyboardEvent) => {
      if (e.key === 'Escape') onClose();
    };
    const handleClickOutside = (e: MouseEvent) => {
      if (flyoutRef.current && !flyoutRef.current.contains(e.target as Node)) {
        onClose();
      }
    };
    
    if (isOpen) {
      document.addEventListener('keydown', handleEscape);
      document.addEventListener('mousedown', handleClickOutside);
    }
    return () => {
      document.removeEventListener('keydown', handleEscape);
      document.removeEventListener('mousedown', handleClickOutside);
    };
  }, [isOpen, onClose]);

  if (!isOpen) return null;

  return createPortal(
    <Box
      ref={flyoutRef}
      position="fixed"
      zIndex={50}
      w="380px"
      bg="bg-iron-gray"
      border
      borderColor="border-charcoal-outline"
      rounded="xl"
      // eslint-disable-next-line gridpilot-rules/component-classification
      className="max-h-[80vh] overflow-y-auto shadow-2xl animate-fade-in"
      // eslint-disable-next-line gridpilot-rules/component-classification
      style={{ top: position.top, left: position.left }}
    >
      {/* Header */}
      <Box display="flex" alignItems="center" justifyContent="between" p={4} borderBottom borderColor="border-charcoal-outline" position="sticky" top="0" bg="bg-iron-gray" zIndex={10}>
        <Stack direction="row" align="center" gap={2}>
          <Icon icon={HelpCircle} size={4} color="text-primary-blue" />
          <Text size="sm" weight="semibold" color="text-white">{title}</Text>
        </Stack>
        <Button
          variant="ghost"
          size="sm"
          onClick={onClose}
          // eslint-disable-next-line gridpilot-rules/component-classification
          className="h-6 w-6 p-0"
        >
          <Icon icon={X} size={4} color="text-gray-400" />
        </Button>
      </Box>
      {/* Content */}
      <Box p={4}>
        {children}
      </Box>
    </Box>,
    document.body
  );
}

function InfoButton({ onClick, buttonRef }: { onClick: () => void; buttonRef: React.Ref<HTMLButtonElement> }) {
  return (
    <Button
      ref={buttonRef}
      variant="ghost"
      size="sm"
      onClick={onClick}
      // eslint-disable-next-line gridpilot-rules/component-classification
      className="h-5 w-5 p-0 rounded-full text-gray-500 hover:text-primary-blue hover:bg-primary-blue/10"
    >
      <Icon icon={HelpCircle} size={3.5} />
    </Button>
  );
}

// ============================================================================
// MOCKUP COMPONENTS FOR FLYOUTS
// ============================================================================

function PointsSystemMockup() {
  const positions = [
    { pos: 1, pts: 25, color: 'bg-yellow-500' },
    { pos: 2, pts: 18, color: 'bg-gray-300' },
    { pos: 3, pts: 15, color: 'bg-amber-600' },
    { pos: 4, pts: 12, color: 'bg-charcoal-outline' },
    { pos: 5, pts: 10, color: 'bg-charcoal-outline' },
  ];

  return (
    <Surface variant="dark" rounded="lg" p={4}>
      <Stack gap={3}>
        <Box display="flex" alignItems="center" justifyContent="between" px={1}>
          <Text 
            // eslint-disable-next-line gridpilot-rules/component-classification
            style={{ fontSize: '10px' }} 
            color="text-gray-500" 
            transform="uppercase" 
            // eslint-disable-next-line gridpilot-rules/component-classification
            className="tracking-wide"
          >
            Position
          </Text>
          <Text 
            // eslint-disable-next-line gridpilot-rules/component-classification
            style={{ fontSize: '10px' }} 
            color="text-gray-500" 
            transform="uppercase" 
            // eslint-disable-next-line gridpilot-rules/component-classification
            className="tracking-wide"
          >
            Points
          </Text>
        </Box>
        {positions.map((p) => (
          <Stack key={p.pos} direction="row" align="center" gap={3}>
            <Box w="8" h="8" rounded="lg" bg={p.color} display="flex" alignItems="center" justifyContent="center">
              <Text size="sm" weight="bold" color={p.pos <= 3 ? 'text-deep-graphite' : 'text-gray-400'}>P{p.pos}</Text>
            </Box>
            <Box flexGrow={1} h="2" bg="bg-charcoal-outline" rounded="full" overflow="hidden" opacity={0.5}>
              <Box
                h="full"
                bg="bg-gradient-to-r from-primary-blue to-neon-aqua"
                rounded="full"
                // eslint-disable-next-line gridpilot-rules/component-classification
                style={{ width: `${(p.pts / 25) * 100}%` }}
              />
            </Box>
            <Box w="8" textAlign="right">
              <Text size="sm" font="mono" weight="semibold" color="text-white">{p.pts}</Text>
            </Box>
          </Stack>
        ))}
        <Box display="flex" alignItems="center" justifyContent="center" gap={1} pt={2}>
          <Text 
            // eslint-disable-next-line gridpilot-rules/component-classification
            style={{ fontSize: '10px' }} 
            color="text-gray-500"
          >
            ...
          </Text>
          <Text 
            // eslint-disable-next-line gridpilot-rules/component-classification
            style={{ fontSize: '10px' }} 
            color="text-gray-500"
          >
            down to P10 = 1 point
          </Text>
        </Box>
      </Stack>
    </Surface>
  );
}

function BonusPointsMockup() {
  const bonuses = [
    { emoji: '🏎️', label: 'Pole Position', pts: '+1', desc: 'Fastest in qualifying' },
    { emoji: '⚡', label: 'Fastest Lap', pts: '+1', desc: 'Best race lap time' },
    { emoji: '🥇', label: 'Led a Lap', pts: '+1', desc: 'Led at least one lap' },
  ];

  return (
    <Surface variant="dark" rounded="lg" p={4}>
      <Stack gap={2}>
        {bonuses.map((b, i) => (
          <Surface key={i} variant="muted" border rounded="lg" p={2}>
            <Stack direction="row" align="center" gap={3}>
              <Text size="xl">{b.emoji}</Text>
              <Box flexGrow={1}>
                <Text size="xs" weight="medium" color="text-white" block>{b.label}</Text>
                <Text 
                  // eslint-disable-next-line gridpilot-rules/component-classification
                  style={{ fontSize: '10px' }} 
                  color="text-gray-500" 
                  block
                >
                  {b.desc}
                </Text>
              </Box>
              <Text size="sm" font="mono" weight="semibold" color="text-performance-green">{b.pts}</Text>
            </Stack>
          </Surface>
        ))}
      </Stack>
    </Surface>
  );
}

function ChampionshipMockup() {
  const standings = [
    { pos: 1, name: 'M. Verstappen', pts: 575, delta: null },
    { pos: 2, name: 'L. Norris', pts: 412, delta: -163 },
    { pos: 3, name: 'C. Leclerc', pts: 389, delta: -186 },
  ];

  return (
    <Surface variant="dark" rounded="lg" p={4}>
      <Box display="flex" alignItems="center" gap={2} mb={3} pb={2} borderBottom borderColor="border-charcoal-outline" opacity={0.5}>
        <Icon icon={Trophy} size={4} color="text-yellow-500" />
        <Text size="xs" weight="semibold" color="text-white">Driver Championship</Text>
      </Box>
      <Stack gap={2}>
        {standings.map((s) => (
          <Stack key={s.pos} direction="row" align="center" gap={2}>
            <Box w="6" h="6" rounded="full" display="flex" alignItems="center" justifyContent="center" bg={s.pos === 1 ? 'bg-yellow-500' : 'bg-charcoal-outline'} color={s.pos === 1 ? 'text-deep-graphite' : 'text-gray-400'}>
              <Text 
                // eslint-disable-next-line gridpilot-rules/component-classification
                style={{ fontSize: '10px' }} 
                weight="bold"
              >
                {s.pos}
              </Text>
            </Box>
            <Box flexGrow={1}>
              <Text size="xs" color="text-white" truncate block>{s.name}</Text>
            </Box>
            <Text size="xs" font="mono" weight="semibold" color="text-white">{s.pts}</Text>
            {s.delta && (
              <Text 
                // eslint-disable-next-line gridpilot-rules/component-classification
                style={{ fontSize: '10px' }} 
                font="mono" 
                color="text-gray-500"
              >
                {s.delta}
              </Text>
            )}
          </Stack>
        ))}
      </Stack>
      <Box mt={3} pt={2} borderTop borderColor="border-charcoal-outline" opacity={0.5} textAlign="center">
        <Text 
          // eslint-disable-next-line gridpilot-rules/component-classification
          style={{ fontSize: '10px' }} 
          color="text-gray-500"
        >
          Points accumulated across all races
        </Text>
      </Box>
    </Surface>
  );
}

interface LeagueScoringSectionProps {
  form: LeagueConfigFormModel;
  presets: LeagueScoringPresetViewModel[];
  onChange?: (form: LeagueConfigFormModel) => void;
  readOnly?: boolean;
  /**
   * When true, only render the scoring pattern panel.
   */
  patternOnly?: boolean;
  /**
   * When true, only render the championships panel.
   */
  championshipsOnly?: boolean;
}

interface ScoringPatternSectionProps {
  scoring: LeagueConfigFormModel['scoring'];
  presets: LeagueScoringPresetViewModel[];
  readOnly?: boolean;
  patternError?: string;
  onChangePatternId?: (patternId: string) => void;
  onToggleCustomScoring?: () => void;
  onUpdateCustomPoints?: (points: CustomPointsConfig) => void;
}

const DEFAULT_CUSTOM_POINTS: CustomPointsConfig = {
  racePoints: [25, 18, 15, 12, 10, 8, 6, 4, 2, 1],
  poleBonusPoints: 1,
  fastestLapPoints: 1,
  leaderLapPoints: 0,
};

interface ChampionshipsSectionProps {
  form: LeagueConfigFormModel;
  onChange?: (form: LeagueConfigFormModel) => void;
  readOnly?: boolean;
}

export function LeagueScoringSection({
  form,
  presets,
  onChange,
  readOnly,
  patternOnly,
  championshipsOnly,
}: LeagueScoringSectionProps) {
  const disabled = readOnly || !onChange;

  const handleSelectPreset = (presetId: string) => {
    if (disabled || !onChange) return;
    // Logic moved to parent component
    onChange({
      ...form,
      scoring: {
        ...form.scoring,
        patternId: presetId,
        customScoringEnabled: false,
      }
    });
  };

  const handleToggleCustomScoring = () => {
    if (disabled || !onChange) return;
    onChange({
      ...form,
      scoring: {
        ...form.scoring,
        customScoringEnabled: !form.scoring.customScoringEnabled,
      }
    });
  };

  const patternProps: ScoringPatternSectionProps = {
    scoring: form.scoring,
    presets,
    readOnly: !!readOnly,
  };

  if (!readOnly && onChange) {
    patternProps.onChangePatternId = handleSelectPreset;
  }

  if (!disabled) {
    patternProps.onToggleCustomScoring = handleToggleCustomScoring;
  }

  const patternPanel = <ScoringPatternSection {...patternProps} />;

  const championshipsProps: ChampionshipsSectionProps = {
    form,
    readOnly: !!readOnly,
  };

  if (onChange) {
    championshipsProps.onChange = onChange;
  }

  const championshipsPanel = <ChampionshipsSection {...championshipsProps} />;

  if (patternOnly) {
    return <Box>{patternPanel}</Box>;
  }

  if (championshipsOnly) {
    return <Box>{championshipsPanel}</Box>;
  }

  return (
    <Grid cols={2} gap={6} 
      // eslint-disable-next-line gridpilot-rules/component-classification
      className="lg:grid-cols-[minmax(0,2fr)_minmax(0,1.4fr)]"
    >
      {patternPanel}
      {championshipsPanel}
    </Grid>
  );
}

/**
 * Step 4 – Super simple scoring preset picker.
 * Flat layout, no collapsibles, easy to understand.
 */
// Preset info content for individual presets
function getPresetInfoContent(presetName: string): { title: string; description: string; details: string[] } {
  const name = presetName.toLowerCase();
  if (name.includes('sprint')) {
    return {
      title: 'Sprint + Feature Format',
      description: 'A two-race weekend format with a shorter sprint race and a longer feature race.',
      details: [
        'Sprint race typically awards reduced points (e.g., 8-6-4-3-2-1)',
        'Feature race awards full points (e.g., 25-18-15-12-10-8-6-4-2-1)',
        'Grid for feature often based on sprint results',
        'Great for competitive leagues with time for multiple races',
      ],
    };
  }
  if (name.includes('endurance') || name.includes('long')) {
    return {
      title: 'Endurance Format',
      description: 'Long-form racing focused on consistency and strategy over raw pace.',
      details: [
        'Single race per weekend, longer duration (60-90+ minutes)',
        'Higher points for finishing (rewards reliability)',
        'Often includes mandatory pit stops',
        'Best for serious leagues with dedicated racers',
      ],
    };
  }
  if (name.includes('club') || name.includes('casual')) {
    return {
      title: 'Club/Casual Format',
      description: 'Relaxed format perfect for community leagues and casual racing.',
      details: [
        'Simple points structure, easy to understand',
        'Typically single race per weekend',
        'Lower stakes, focus on participation',
        'Great for beginners or mixed-skill leagues',
      ],
    };
  }
  return {
    title: 'Standard Race Format',
    description: 'Traditional single-race weekend with standard F1-style points.',
    details: [
      'Points: 25-18-15-12-10-8-6-4-2-1 for top 10',
      'Bonus points for pole position and fastest lap',
      'One race per weekend',
      'The most common format used in sim racing',
    ],
  };
}

export function ScoringPatternSection({
  scoring,
  presets,
  readOnly,
  patternError,
  onChangePatternId,
  onToggleCustomScoring,
  onUpdateCustomPoints,
}: ScoringPatternSectionProps) {
  const disabled = readOnly || !onChangePatternId;
  const isCustom = scoring.customScoringEnabled;

  // Local state for custom points editor
  const [customPoints, setCustomPoints] = useState<CustomPointsConfig>(DEFAULT_CUSTOM_POINTS);

  const updateRacePoints = (index: number, delta: number) => {
    setCustomPoints((prev) => {
      const newPoints = [...prev.racePoints];
      newPoints[index] = Math.max(0, (newPoints[index] ?? 0) + delta);
      const updated = { ...prev, racePoints: newPoints };
      onUpdateCustomPoints?.(updated);
      return updated;
    });
  };

  const addPosition = () => {
    setCustomPoints((prev) => {
      const lastPoints = prev.racePoints[prev.racePoints.length - 1] ?? 0;
      const updated = { ...prev, racePoints: [...prev.racePoints, Math.max(0, lastPoints - 1)] };
      onUpdateCustomPoints?.(updated);
      return updated;
    });
  };

  const removePosition = () => {
    if (customPoints.racePoints.length <= 3) return;
    setCustomPoints((prev) => {
      const updated = { ...prev, racePoints: prev.racePoints.slice(0, -1) };
      onUpdateCustomPoints?.(updated);
      return updated;
    });
  };

  const updateBonus = (key: keyof Omit<CustomPointsConfig, 'racePoints'>, delta: number) => {
    setCustomPoints((prev) => {
      const updated = { ...prev, [key]: Math.max(0, prev[key] + delta) };
      onUpdateCustomPoints?.(updated);
      return updated;
    });
  };

  const resetToDefaults = () => {
    setCustomPoints(DEFAULT_CUSTOM_POINTS);
    onUpdateCustomPoints?.(DEFAULT_CUSTOM_POINTS);
  };

  const getPresetEmoji = (preset: LeagueScoringPresetViewModel) => {
    const name = preset.name.toLowerCase();
    if (name.includes('sprint')) return '🏁';
    if (name.includes('endurance')) return '🔋';
    if (name.includes('club')) return '🤝';
    return '🏆';
  };

  const getPresetDescription = (preset: LeagueScoringPresetViewModel) => {
    return preset.sessionSummary || 'Standard scoring format';
  };

  // Flyout state
  const [showPointsFlyout, setShowPointsFlyout] = useState(false);
  const [showBonusFlyout, setShowBonusFlyout] = useState(false);
  const [activePresetFlyout, setActivePresetFlyout] = useState<string | null>(null);
  const pointsInfoRef = useRef<HTMLButtonElement>(null!);
  const bonusInfoRef = useRef<HTMLButtonElement>(null!);
  const presetInfoRefs = useRef<Record<string, HTMLElement | null>>({});

  return (
    <Stack gap={5}>
      {/* Section header */}
      <Stack direction="row" align="center" gap={3}>
        <Box w="10" h="10" display="flex" alignItems="center" justifyContent="center" rounded="xl" bg="bg-primary-blue" opacity={0.1}>
          <Icon icon={Trophy} size={5} color="text-primary-blue" />
        </Box>
        <Box flexGrow={1}>
          <Stack direction="row" align="center" gap={2}>
            <Heading level={3}>Points System</Heading>
            <InfoButton buttonRef={pointsInfoRef} onClick={() => setShowPointsFlyout(true)} />
          </Stack>
          <Text size="xs" color="text-gray-500">Choose how points are awarded</Text>
        </Box>
      </Stack>

      {/* Points System Flyout */}
      <InfoFlyout
        isOpen={showPointsFlyout}
        onClose={() => setShowPointsFlyout(false)}
        title="How Points Work"
        anchorRef={pointsInfoRef}
      >
        <Stack gap={4}>
          <Text size="xs" color="text-gray-400">
            Points are awarded based on finishing position. Higher positions earn more points,
            which accumulate across the season to determine championship standings.
          </Text>
          
          <Box>
            <Box mb={2}>
              <Text 
                // eslint-disable-next-line gridpilot-rules/component-classification
                style={{ fontSize: '10px' }} 
                color="text-gray-500" 
                transform="uppercase" 
                // eslint-disable-next-line gridpilot-rules/component-classification
                className="tracking-wide"
              >
                Example: F1-Style Points
              </Text>
            </Box>
            <PointsSystemMockup />
          </Box>

          <Surface variant="muted" border rounded="lg" p={3}>
            <Stack direction="row" align="start" gap={2}>
              <Icon icon={Zap} size={3.5} color="text-primary-blue" 
                // eslint-disable-next-line gridpilot-rules/component-classification
                className="mt-0.5" 
              />
              <Text 
                // eslint-disable-next-line gridpilot-rules/component-classification
                style={{ fontSize: '11px' }} 
                color="text-gray-400"
              >
                <Text weight="medium" color="text-primary-blue">Pro tip:</Text> Sprint formats
                award points in both races, typically with reduced points for the sprint.
              </Text>
            </Stack>
          </Surface>
        </Stack>
      </InfoFlyout>

      {/* Two-column layout: Presets | Custom */}
      <Grid cols={2} gap={4} 
        // eslint-disable-next-line gridpilot-rules/component-classification
        className="lg:grid-cols-[1fr_auto]"
      >
        {/* Preset options */}
        <Stack gap={2}>
          {presets.length === 0 ? (
            <Box p={4} border borderStyle="dashed" borderColor="border-charcoal-outline" rounded="lg">
              <Text size="sm" color="text-gray-400">Loading presets...</Text>
            </Box>
          ) : (
            presets.map((preset) => {
              const isSelected = !isCustom && scoring.patternId === preset.id;
              const presetInfo = getPresetInfoContent(preset.name);
              return (
                <Box key={preset.id} position="relative">
                  <Button
                    variant="ghost"
                    onClick={() => onChangePatternId?.(preset.id)}
                    disabled={disabled}
                    // eslint-disable-next-line gridpilot-rules/component-classification
                    className={`
                      w-full flex items-center gap-3 p-3 rounded-xl border-2 text-left transition-all duration-200 h-auto
                      ${isSelected
                        ? 'border-primary-blue bg-primary-blue/10'
                        : 'border-charcoal-outline/40 bg-iron-gray/20 hover:border-charcoal-outline hover:bg-iron-gray/40'
                      }
                    `}
                  >
                    {/* Radio indicator */}
                    <Box
                      w="5"
                      h="5"
                      display="flex"
                      alignItems="center"
                      justifyContent="center"
                      rounded="full"
                      border
                      borderColor={isSelected ? 'border-primary-blue' : 'border-gray-500'}
                      bg={isSelected ? 'bg-primary-blue' : 'transparent'}
                      transition
                      flexShrink={0}
                    >
                      {isSelected && <Icon icon={Check} size={3} color="text-white" />}
                    </Box>

                    {/* Emoji */}
                    <Text size="xl">{getPresetEmoji(preset)}</Text>

                    {/* Text */}
                    <Box flexGrow={1} 
                      // eslint-disable-next-line gridpilot-rules/component-classification
                      className="min-w-0"
                    >
                      <Text size="sm" weight="medium" color="text-white" block>{preset.name}</Text>
                      <Text size="xs" color="text-gray-500" block>{getPresetDescription(preset)}</Text>
                    </Box>

                    {/* Bonus badge */}
                    {preset.bonusSummary && (
                      <Box 
                        // eslint-disable-next-line gridpilot-rules/component-classification
                        className="hidden sm:inline-flex items-center gap-1 px-2 py-1 rounded-full bg-charcoal-outline/30 text-[10px] text-gray-400"
                      >
                        <Icon icon={Zap} size={3} />
                        <Text>{preset.bonusSummary}</Text>
                      </Box>
                    )}

                    {/* Info button */}
                    <Box
                      ref={(el: HTMLElement | null) => { presetInfoRefs.current[preset.id] = el; }}
                      role="button"
                      tabIndex={0}
                      onClick={(e: React.MouseEvent) => {
                        e.stopPropagation();
                        setActivePresetFlyout(activePresetFlyout === preset.id ? null : preset.id);
                      }}
                      onKeyDown={(e: React.KeyboardEvent) => {
                        if (e.key === 'Enter' || e.key === ' ') {
                          e.preventDefault();
                          e.stopPropagation();
                          setActivePresetFlyout(activePresetFlyout === preset.id ? null : preset.id);
                        }
                      }}
                      display="flex"
                      h="6"
                      w="6"
                      alignItems="center"
                      justifyContent="center"
                      rounded="full"
                      color="text-gray-500"
                      hoverTextColor="text-primary-blue"
                      hoverBg="bg-primary-blue/10"
                      transition
                      flexShrink={0}
                    >
                      <Icon icon={HelpCircle} size={3.5} />
                    </Box>
                  </Button>

                  {/* Preset Info Flyout */}
                  <InfoFlyout
                    isOpen={activePresetFlyout === preset.id}
                    onClose={() => setActivePresetFlyout(null)}
                    title={presetInfo.title}
                    anchorRef={{ current: presetInfoRefs.current[preset.id] ?? pointsInfoRef.current }}
                  >
                    <Stack gap={4}>
                      <Text size="xs" color="text-gray-400">{presetInfo.description}</Text>
                      
                      <Stack gap={2}>
                        <Box>
                          <Text 
                            // eslint-disable-next-line gridpilot-rules/component-classification
                            style={{ fontSize: '10px' }} 
                            color="text-gray-500" 
                            transform="uppercase" 
                            // eslint-disable-next-line gridpilot-rules/component-classification
                            className="tracking-wide"
                          >
                            Key Features
                          </Text>
                        </Box>
                        <Box as="ul" 
                          // eslint-disable-next-line gridpilot-rules/component-classification
                          className="space-y-1.5"
                        >
                          {presetInfo.details.map((detail, idx) => (
                            <Box as="li" key={idx} display="flex" alignItems="start" gap={2}>
                              <Icon icon={Check} size={3} color="text-performance-green" 
                                // eslint-disable-next-line gridpilot-rules/component-classification
                                className="mt-0.5" 
                              />
                              <Text size="xs" color="text-gray-400">{detail}</Text>
                            </Box>
                          ))}
                        </Box>
                      </Stack>

                      {preset.bonusSummary && (
                        <Surface variant="muted" border rounded="lg" p={3}>
                          <Stack direction="row" align="start" gap={2}>
                            <Icon icon={Zap} size={3.5} color="text-primary-blue" 
                              // eslint-disable-next-line gridpilot-rules/component-classification
                              className="mt-0.5" 
                            />
                            <Text 
                              // eslint-disable-next-line gridpilot-rules/component-classification
                              style={{ fontSize: '11px' }} 
                              color="text-gray-400"
                            >
                              <Text weight="medium" color="text-primary-blue">Bonus points:</Text> {preset.bonusSummary}
                            </Text>
                          </Stack>
                        </Surface>
                      )}
                    </Stack>
                  </InfoFlyout>
                </Box>
              );
            })
          )}
        </Stack>

        {/* Custom scoring option */}
        <Box w="full" 
          // eslint-disable-next-line gridpilot-rules/component-classification
          className="lg:w-48"
        >
          <Button
            variant="ghost"
            onClick={onToggleCustomScoring}
            disabled={!onToggleCustomScoring || readOnly}
            // eslint-disable-next-line gridpilot-rules/component-classification
            className={`
              w-full h-full min-h-[100px] flex flex-col items-center justify-center gap-2 p-4 rounded-xl border-2 transition-all duration-200
              ${isCustom
                ? 'border-primary-blue bg-primary-blue/10'
                : 'border-dashed border-charcoal-outline/50 bg-iron-gray/10 hover:border-charcoal-outline hover:bg-iron-gray/20'
              }
            `}
          >
            <Box
              w="10"
              h="10"
              display="flex"
              alignItems="center"
              justifyContent="center"
              rounded="xl"
              bg={isCustom ? 'bg-primary-blue' : 'bg-charcoal-outline'}
              opacity={isCustom ? 0.2 : 0.3}
              transition
            >
              <Icon icon={Settings} size={5} color={isCustom ? 'text-primary-blue' : 'text-gray-500'} />
            </Box>
            <Box textAlign="center">
              <Text size="sm" weight="medium" color={isCustom ? 'text-white' : 'text-gray-400'} block>Custom</Text>
              <Text 
                // eslint-disable-next-line gridpilot-rules/component-classification
                style={{ fontSize: '10px' }} 
                color="text-gray-500" 
                block
              >
                Define your own
              </Text>
            </Box>
            {isCustom && (
              <Box display="flex" alignItems="center" gap={1} px={2} py={0.5} rounded="full" bg="bg-primary-blue" opacity={0.2}>
                <Icon icon={Check} size={2.5} color="text-primary-blue" />
                <Text 
                  // eslint-disable-next-line gridpilot-rules/component-classification
                  style={{ fontSize: '10px' }} 
                  weight="medium" 
                  color="text-primary-blue"
                >
                  Active
                </Text>
              </Box>
            )}
          </Button>
        </Box>
      </Grid>

      {/* Error message */}
      {patternError && (
        <Text size="xs" color="text-warning-amber">{patternError}</Text>
      )}

      {/* Custom scoring editor - inline, no placeholder */}
      {isCustom && (
        <Surface variant="muted" border rounded="xl" p={4}>
          <Stack gap={4}>
            {/* Header with reset button */}
            <Box display="flex" alignItems="center" justifyContent="between">
              <Stack direction="row" align="center" gap={2}>
                <Icon icon={Settings} size={4} color="text-primary-blue" />
                <Text size="sm" weight="medium" color="text-white">Custom Points Table</Text>
                <InfoButton buttonRef={bonusInfoRef} onClick={() => setShowBonusFlyout(true)} />
              </Stack>

              {/* Bonus Points Flyout */}
              <InfoFlyout
                isOpen={showBonusFlyout}
                onClose={() => setShowBonusFlyout(false)}
                title="Bonus Points Explained"
                anchorRef={bonusInfoRef}
              >
                <Stack gap={4}>
                  <Text size="xs" color="text-gray-400">
                    Bonus points reward exceptional performances beyond just finishing position.
                    They add strategic depth and excitement to your championship.
                  </Text>
                  
                  <Box>
                    <Box mb={2}>
                      <Text 
                        // eslint-disable-next-line gridpilot-rules/component-classification
                        style={{ fontSize: '10px' }} 
                        color="text-gray-500" 
                        transform="uppercase" 
                        // eslint-disable-next-line gridpilot-rules/component-classification
                        className="tracking-wide"
                      >
                        Available Bonuses
                      </Text>
                    </Box>
                    <BonusPointsMockup />
                  </Box>

                  <Surface variant="muted" border rounded="lg" p={3}>
                    <Stack direction="row" align="start" gap={2}>
                      <Icon icon={Zap} size={3.5} color="text-primary-blue" 
                        // eslint-disable-next-line gridpilot-rules/component-classification
                        className="mt-0.5" 
                      />
                      <Text 
                        // eslint-disable-next-line gridpilot-rules/component-classification
                        style={{ fontSize: '11px' }} 
                        color="text-gray-400"
                      >
                        <Text weight="medium" color="text-primary-blue">Example:</Text> A driver finishing
                        P1 with pole and fastest lap would earn 25 + 1 + 1 = 27 points.
                      </Text>
                    </Stack>
                  </Surface>
                </Stack>
              </InfoFlyout>

              <Button
                variant="ghost"
                size="sm"
                onClick={resetToDefaults}
                disabled={readOnly}
                // eslint-disable-next-line gridpilot-rules/component-classification
                className="h-auto py-1 px-2 text-[10px] text-gray-400 hover:text-primary-blue hover:bg-primary-blue/10"
              >
                <Stack direction="row" align="center" gap={1}>
                  <Icon icon={RotateCcw} size={3} />
                  <Text>Reset</Text>
                </Stack>
              </Button>
            </Box>

            {/* Race position points */}
            <Stack gap={2}>
              <Box display="flex" alignItems="center" justifyContent="between">
                <Text size="xs" color="text-gray-400">Finish position points</Text>
                <Stack direction="row" align="center" gap={1}>
                  <Button
                    variant="secondary"
                    size="sm"
                    onClick={removePosition}
                    disabled={readOnly || customPoints.racePoints.length <= 3}
                    // eslint-disable-next-line gridpilot-rules/component-classification
                    className="h-5 w-5 p-0"
                  >
                    <Icon icon={Minus} size={3} />
                  </Button>
                  <Button
                    variant="secondary"
                    size="sm"
                    onClick={addPosition}
                    disabled={readOnly || customPoints.racePoints.length >= 20}
                    // eslint-disable-next-line gridpilot-rules/component-classification
                    className="h-5 w-5 p-0"
                  >
                    <Icon icon={Plus} size={3} />
                  </Button>
                </Stack>
              </Box>
              
              <Box display="flex" flexWrap="wrap" gap={1}>
                {customPoints.racePoints.map((pts, idx) => (
                  <Stack key={idx} align="center">
                    <Text 
                      // eslint-disable-next-line gridpilot-rules/component-classification
                      style={{ fontSize: '9px' }} 
                      color="text-gray-500" 
                      mb={0.5}
                    >
                      P{idx + 1}
                    </Text>
                    <Box display="flex" alignItems="center">
                      <Button
                        variant="secondary"
                        size="sm"
                        onClick={() => updateRacePoints(idx, -1)}
                        disabled={readOnly || pts <= 0}
                        // eslint-disable-next-line gridpilot-rules/component-classification
                        className="h-5 w-4 p-0 rounded-r-none text-[10px]"
                      >
                        −
                      </Button>
                      <Box w="6" h="5" display="flex" alignItems="center" justifyContent="center" bg="bg-deep-graphite" border borderTop borderBottom borderColor="border-charcoal-outline">
                        <Text 
                          // eslint-disable-next-line gridpilot-rules/component-classification
                          style={{ fontSize: '10px' }} 
                          weight="medium" 
                          color="text-white"
                        >
                          {pts}
                        </Text>
                      </Box>
                      <Button
                        variant="secondary"
                        size="sm"
                        onClick={() => updateRacePoints(idx, 1)}
                        disabled={readOnly}
                        // eslint-disable-next-line gridpilot-rules/component-classification
                        className="h-5 w-4 p-0 rounded-l-none text-[10px]"
                      >
                        +
                      </Button>
                    </Box>
                  </Stack>
                ))}
              </Box>
            </Stack>

            {/* Bonus points */}
            <Grid cols={3} gap={3}>
              {[
                { key: 'poleBonusPoints' as const, label: 'Pole', emoji: '🏎️' },
                { key: 'fastestLapPoints' as const, label: 'Fast lap', emoji: '⚡' },
                { key: 'leaderLapPoints' as const, label: 'Led lap', emoji: '🥇' },
              ].map((bonus) => (
                <Stack key={bonus.key} align="center" gap={1}>
                  <Text 
                    // eslint-disable-next-line gridpilot-rules/component-classification
                    style={{ fontSize: '10px' }} 
                    color="text-gray-500"
                  >
                    {bonus.emoji} {bonus.label}
                  </Text>
                  <Box display="flex" alignItems="center">
                    <Button
                      variant="secondary"
                      size="sm"
                      onClick={() => updateBonus(bonus.key, -1)}
                      disabled={readOnly || customPoints[bonus.key] <= 0}
                      // eslint-disable-next-line gridpilot-rules/component-classification
                      className="h-6 w-5 p-0 rounded-r-none"
                    >
                      −
                    </Button>
                    <Box w="7" h="6" display="flex" alignItems="center" justifyContent="center" bg="bg-deep-graphite" border borderTop borderBottom borderColor="border-charcoal-outline">
                      <Text size="xs" weight="medium" color="text-white">{customPoints[bonus.key]}</Text>
                    </Box>
                    <Button
                      variant="secondary"
                      size="sm"
                      onClick={() => updateBonus(bonus.key, 1)}
                      disabled={readOnly}
                      // eslint-disable-next-line gridpilot-rules/component-classification
                      className="h-6 w-5 p-0 rounded-l-none"
                    >
                      +
                    </Button>
                  </Box>
                </Stack>
              ))}
            </Grid>
          </Stack>
        </Surface>
      )}
    </Stack>
  );
}

/**
 * Championships section - simple inline toggle list.
 * No collapsibles, flat and easy to scan.
 */
// Championship info content
const CHAMPIONSHIP_INFO: Record<string, { title: string; description: string; details: string[] }> = {
  enableDriverChampionship: {
    title: 'Driver Championship',
    description: 'Track individual driver performance across all races in the season.',
    details: [
      'Each driver accumulates points based on race finishes',
      'The driver with most points at season end wins',
      'Standard in all racing leagues',
      'Shows overall driver skill and consistency',
    ],
  },
  enableTeamChampionship: {
    title: 'Team Championship',
    description: 'Combine points from all drivers within a team for team standings.',
    details: [
      'All drivers\' points count toward team total',
      'Rewards having consistent performers across the roster',
      'Creates team strategy opportunities',
      'Only available in Teams mode leagues',
    ],
  },
  enableNationsChampionship: {
    title: 'Nations Cup',
    description: 'Group drivers by nationality for international competition.',
    details: [
      'Drivers represent their country automatically',
      'Points pooled by nationality',
      'Adds international rivalry element',
      'Great for diverse, international leagues',
    ],
  },
  enableTrophyChampionship: {
    title: 'Trophy Championship',
    description: 'A special category championship for specific classes or groups.',
    details: [
      'Custom category you define (e.g., Am drivers, rookies)',
      'Separate standings from main championship',
      'Encourages participation from all skill levels',
      'Can be used for gentleman drivers, newcomers, etc.',
    ],
  },
};

export function ChampionshipsSection({
  form,
  onChange,
  readOnly,
}: ChampionshipsSectionProps) {
  const disabled = readOnly || !onChange;
  const isTeamsMode = form.structure.mode === 'fixedTeams';
  const [showChampFlyout, setShowChampFlyout] = useState(false);
  const [activeChampFlyout, setActiveChampFlyout] = useState<string | null>(null);
  const champInfoRef = useRef<HTMLButtonElement>(null!);
  const champItemRefs = useRef<Record<string, HTMLElement | null>>({});

  const updateChampionship = (key: keyof LeagueConfigFormModel['championships'], value: boolean) => {
    if (!onChange) return;
    onChange({
      ...form,
      championships: {
        ...form.championships,
        [key]: value
      }
    });
  };

  const championships = [
    {
      key: 'enableDriverChampionship' as const,
      icon: Trophy,
      label: 'Driver Standings',
      description: 'Track individual driver points',
      enabled: form.championships.enableDriverChampionship,
      available: true,
    },
    {
      key: 'enableTeamChampionship' as const,
      icon: Award,
      label: 'Team Standings',
      description: 'Combined team points',
      enabled: form.championships.enableTeamChampionship,
      available: isTeamsMode,
      unavailableHint: 'Teams mode only',
    },
    {
      key: 'enableNationsChampionship' as const,
      icon: Globe,
      label: 'Nations Cup',
      description: 'By nationality',
      enabled: form.championships.enableNationsChampionship,
      available: true,
    },
    {
      key: 'enableTrophyChampionship' as const,
      icon: Medal,
      label: 'Trophy Cup',
      description: 'Special category',
      enabled: form.championships.enableTrophyChampionship,
      available: true,
    },
  ];

  return (
    <Stack gap={4}>
      {/* Section header */}
      <Stack direction="row" align="center" gap={3}>
        <Box w="10" h="10" display="flex" alignItems="center" justifyContent="center" rounded="xl" bg="bg-primary-blue" opacity={0.1}>
          <Icon icon={Award} size={5} color="text-primary-blue" />
        </Box>
        <Box flexGrow={1}>
          <Stack direction="row" align="center" gap={2}>
            <Heading level={3}>Championships</Heading>
            <InfoButton buttonRef={champInfoRef} onClick={() => setShowChampFlyout(true)} />
          </Stack>
          <Text size="xs" color="text-gray-500">What standings to track</Text>
        </Box>
      </Stack>

      {/* Championships Flyout */}
      <InfoFlyout
        isOpen={showChampFlyout}
        onClose={() => setShowChampFlyout(false)}
        title="Championship Standings"
        anchorRef={champInfoRef}
      >
        <Stack gap={4}>
          <Text size="xs" color="text-gray-400">
            Championships track cumulative points across all races. You can enable multiple
            championship types to run different competitions simultaneously.
          </Text>
          
          <Box>
            <Box mb={2}>
              <Text 
                // eslint-disable-next-line gridpilot-rules/component-classification
                style={{ fontSize: '10px' }} 
                color="text-gray-500" 
                transform="uppercase" 
                // eslint-disable-next-line gridpilot-rules/component-classification
                className="tracking-wide"
              >
                Live Standings Example
              </Text>
            </Box>
            <ChampionshipMockup />
          </Box>

          <Stack gap={2}>
            <Box>
              <Text 
                // eslint-disable-next-line gridpilot-rules/component-classification
                style={{ fontSize: '10px' }} 
                color="text-gray-500" 
                transform="uppercase" 
                // eslint-disable-next-line gridpilot-rules/component-classification
                className="tracking-wide"
              >
                Championship Types
              </Text>
            </Box>
            <Grid cols={2} gap={2}>
              {[
                { icon: Trophy, label: 'Driver', desc: 'Individual points' },
                { icon: Award, label: 'Team', desc: 'Combined drivers' },
                { icon: Globe, label: 'Nations', desc: 'By country' },
                { icon: Medal, label: 'Trophy', desc: 'Special class' },
              ].map((t, i) => (
                <Surface key={i} variant="dark" border rounded="lg" p={2}>
                  <Stack direction="row" align="center" gap={2}>
                    <Icon icon={t.icon} size={3.5} color="text-primary-blue" />
                    <Box>
                      <Text 
                        // eslint-disable-next-line gridpilot-rules/component-classification
                        style={{ fontSize: '10px' }} 
                        weight="medium" 
                        color="text-white" 
                        block
                      >
                        {t.label}
                      </Text>
                      <Text 
                        // eslint-disable-next-line gridpilot-rules/component-classification
                        style={{ fontSize: '9px' }} 
                        color="text-gray-500" 
                        block
                      >
                        {t.desc}
                      </Text>
                    </Box>
                  </Stack>
                </Surface>
              ))}
            </Grid>
          </Stack>
        </Stack>
      </InfoFlyout>

      {/* Inline toggle grid */}
      <Grid cols={2} gap={2}>
        {championships.map((champ) => {
          const isEnabled = champ.enabled && champ.available;
          const champInfo = CHAMPIONSHIP_INFO[champ.key];
          
          return (
            <Box key={champ.key} position="relative">
              <Button
                variant="ghost"
                disabled={disabled || !champ.available}
                onClick={() => champ.available && updateChampionship(champ.key, !champ.enabled)}
                // eslint-disable-next-line gridpilot-rules/component-classification
                className={`
                  w-full flex items-center gap-3 p-3 rounded-xl border-2 text-left transition-all duration-200 h-auto
                  ${isEnabled
                    ? 'border-primary-blue/40 bg-primary-blue/10'
                    : champ.available
                    ? 'border-charcoal-outline/40 bg-iron-gray/20 hover:border-charcoal-outline hover:bg-iron-gray/30'
                    : 'border-charcoal-outline/20 bg-iron-gray/10 opacity-50 cursor-not-allowed'
                  }
                `}
              >
                {/* Toggle indicator */}
                <Box
                  w="5"
                  h="5"
                  display="flex"
                  alignItems="center"
                  justifyContent="center"
                  rounded="md"
                  bg={isEnabled ? 'bg-primary-blue' : 'bg-charcoal-outline'}
                  opacity={isEnabled ? 1 : 0.5}
                  transition
                  flexShrink={0}
                >
                  {isEnabled && <Icon icon={Check} size={3} color="text-white" />}
                </Box>

                {/* Icon */}
                <Icon icon={champ.icon} size={4} color={isEnabled ? 'text-primary-blue' : 'text-gray-500'} 
                  // eslint-disable-next-line gridpilot-rules/component-classification
                  className="shrink-0" 
                />

                {/* Text */}
                <Box flexGrow={1} 
                  // eslint-disable-next-line gridpilot-rules/component-classification
                  className="min-w-0"
                >
                  <Text 
                    // eslint-disable-next-line gridpilot-rules/component-classification
                    className={`text-xs font-medium truncate ${isEnabled ? 'text-white' : 'text-gray-400'}`} 
                    block
                  >
                    {champ.label}
                  </Text>
                  {!champ.available && champ.unavailableHint && (
                    <Text 
                      // eslint-disable-next-line gridpilot-rules/component-classification
                      style={{ fontSize: '10px' }} 
                      color="text-warning-amber" 
                      opacity={0.7} 
                      block
                    >
                      {champ.unavailableHint}
                    </Text>
                  )}
                </Box>

                {/* Info button */}
                <Box
                  ref={(el: HTMLElement | null) => { champItemRefs.current[champ.key] = el; }}
                  role="button"
                  tabIndex={0}
                  onClick={(e: React.MouseEvent) => {
                    e.stopPropagation();
                    setActiveChampFlyout(activeChampFlyout === champ.key ? null : champ.key);
                  }}
                  onKeyDown={(e: React.KeyboardEvent) => {
                    if (e.key === 'Enter' || e.key === ' ') {
                      e.preventDefault();
                      e.stopPropagation();
                      setActiveChampFlyout(activeChampFlyout === champ.key ? null : champ.key);
                    }
                  }}
                  display="flex"
                  h="5"
                  w="5"
                  alignItems="center"
                  justifyContent="center"
                  rounded="full"
                  color="text-gray-500"
                  hoverTextColor="text-primary-blue"
                  hoverBg="bg-primary-blue/10"
                  transition
                  flexShrink={0}
                >
                  <Icon icon={HelpCircle} size={3} />
                </Box>
              </Button>

              {/* Championship Item Info Flyout */}
              {champInfo && (
                <InfoFlyout
                  isOpen={activeChampFlyout === champ.key}
                  onClose={() => setActiveChampFlyout(null)}
                  title={champInfo.title}
                  anchorRef={{ current: (champItemRefs.current[champ.key] as HTMLElement | null) ?? champInfoRef.current }}
                >
                  <Stack gap={4}>
                    <Text size="xs" color="text-gray-400">{champInfo.description}</Text>
                    
                    <Stack gap={2}>
                      <Box>
                        <Text 
                          // eslint-disable-next-line gridpilot-rules/component-classification
                          style={{ fontSize: '10px' }} 
                          color="text-gray-500" 
                          transform="uppercase" 
                          // eslint-disable-next-line gridpilot-rules/component-classification
                          className="tracking-wide"
                        >
                          How It Works
                        </Text>
                      </Box>
                      <Box as="ul" 
                        // eslint-disable-next-line gridpilot-rules/component-classification
                        className="space-y-1.5"
                      >
                        {champInfo.details.map((detail, idx) => (
                          <Box as="li" key={idx} display="flex" alignItems="start" gap={2}>
                            <Icon icon={Check} size={3} color="text-performance-green" 
                              // eslint-disable-next-line gridpilot-rules/component-classification
                              className="mt-0.5" 
                            />
                            <Text size="xs" color="text-gray-400">{detail}</Text>
                          </Box>
                        ))}
                      </Box>
                    </Stack>

                    {!champ.available && (
                      <Surface variant="muted" border rounded="lg" p={3} 
                        // eslint-disable-next-line gridpilot-rules/component-classification
                        className="bg-warning-amber/5 border-warning-amber/20"
                      >
                        <Stack direction="row" align="start" gap={2}>
                          <Icon icon={Zap} size={3.5} color="text-warning-amber" 
                            // eslint-disable-next-line gridpilot-rules/component-classification
                            className="mt-0.5" 
                          />
                          <Text 
                            // eslint-disable-next-line gridpilot-rules/component-classification
                            style={{ fontSize: '11px' }} 
                            color="text-gray-400"
                          >
                            <Text weight="medium" color="text-warning-amber">Note:</Text> {champ.unavailableHint}. Switch to Teams mode to enable this championship.
                          </Text>
                        </Stack>
                      </Surface>
                    )}
                  </Stack>
                </InfoFlyout>
              )}
            </Box>
          );
        })}
      </Grid>
    </Stack>
  );
}
