'use client';

import { Trophy, Users, Check, HelpCircle, X } from 'lucide-react';
import { useState, useRef, useEffect } from 'react';
import type * as React from 'react';
import { createPortal } from 'react-dom';
import type { LeagueConfigFormModel } from '@/lib/types/LeagueConfigFormModel';

// Minimum drivers for ranked leagues
const MIN_RANKED_DRIVERS = 10;

// ============================================================================
// 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(340, window.innerWidth - 40);
      const flyoutHeight = 350;
      const padding = 16;
      
      let left = rect.right + 12;
      let top = rect.top;
      
      if (left + flyoutWidth > window.innerWidth - padding) {
        left = rect.left - flyoutWidth - 12;
      }
      if (left < padding) {
        left = Math.max(padding, (window.innerWidth - flyoutWidth) / 2);
      }
      
      top = rect.top - flyoutHeight / 3;
      if (top + flyoutHeight > window.innerHeight - padding) {
        top = window.innerHeight - flyoutHeight - padding;
      }
      if (top < padding) top = padding;
      
      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 || !mounted) return null;

  return createPortal(
    <div
      ref={flyoutRef}
      className="fixed z-50 w-[340px] max-h-[80vh] overflow-y-auto bg-iron-gray border border-charcoal-outline rounded-xl shadow-2xl animate-fade-in"
      style={{ top: position.top, left: position.left }}
    >
      <div className="flex items-center justify-between p-4 border-b border-charcoal-outline/50 sticky top-0 bg-iron-gray z-10">
        <div className="flex items-center gap-2">
          <HelpCircle className="w-4 h-4 text-primary-blue" />
          <span className="text-sm font-semibold text-white">{title}</span>
        </div>
        <button
          type="button"
          onClick={onClose}
          className="flex h-6 w-6 items-center justify-center rounded-md hover:bg-charcoal-outline transition-colors"
        >
          <X className="w-4 h-4 text-gray-400" />
        </button>
      </div>
      <div className="p-4">
        {children}
      </div>
    </div>,
    document.body
  );
}

interface LeagueVisibilitySectionProps {
  form: LeagueConfigFormModel;
  onChange?: (form: LeagueConfigFormModel) => void;
  errors?: {
    visibility?: string;
  };
  readOnly?: boolean;
}

export function LeagueVisibilitySection({
  form,
  onChange,
  errors,
  readOnly,
}: LeagueVisibilitySectionProps) {
  const basics = form.basics;
  const disabled = readOnly || !onChange;

  // Flyout state
  const [showRankedFlyout, setShowRankedFlyout] = useState(false);
  const [showUnrankedFlyout, setShowUnrankedFlyout] = useState(false);
  const rankedInfoRef = useRef<HTMLButtonElement>(null!);
  const unrankedInfoRef = useRef<HTMLButtonElement>(null!);

  // Normalize visibility to new terminology
  const isRanked = basics.visibility === 'public';

  // Auto-update minDrivers when switching to ranked
  const handleVisibilityChange = (visibility: 'public' | 'private' | 'unlisted') => {
    if (!onChange) return;
    
    // If switching to public and current maxDrivers is below minimum, update it
    if (visibility === 'public' && (form.structure?.maxDrivers ?? 0) < MIN_RANKED_DRIVERS) {
      onChange({
        ...form,
        basics: { ...form.basics, visibility },
        structure: { ...form.structure, maxDrivers: MIN_RANKED_DRIVERS },
      });
    } else {
      onChange({
        ...form,
        basics: { ...form.basics, visibility },
      });
    }
  };

  return (
    <div className="space-y-8">
      {/* Emotional header for the step */}
      <div className="text-center pb-2">
        <h3 className="text-lg font-semibold text-white mb-2">
          Choose your league's destiny
        </h3>
        <p className="text-sm text-gray-400 max-w-lg mx-auto">
          Will you compete for glory on the global leaderboards, or race with friends in a private series?
        </p>
      </div>

      {/* League Type Selection */}
      <div className="grid grid-cols-1 md:grid-cols-2 gap-6">
        {/* Ranked (Public) Option */}
        <div className="relative">
          <button
            type="button"
            disabled={disabled}
            onClick={() => handleVisibilityChange('public')}
            className={`w-full group relative flex flex-col gap-4 p-6 text-left rounded-xl border-2 transition-all duration-200 ${
              isRanked
                ? 'border-primary-blue bg-gradient-to-br from-primary-blue/15 to-primary-blue/5 shadow-[0_0_30px_rgba(25,140,255,0.25)]'
                : 'border-charcoal-outline bg-iron-gray/30 hover:border-gray-500 hover:bg-iron-gray/50'
            } ${disabled ? 'opacity-60 cursor-not-allowed' : 'cursor-pointer'}`}
          >
            {/* Header */}
            <div className="flex items-start justify-between">
              <div className="flex items-center gap-3">
                <div className={`flex h-14 w-14 items-center justify-center rounded-xl ${
                  isRanked ? 'bg-primary-blue/30' : 'bg-charcoal-outline/50'
                }`}>
                  <Trophy className={`w-7 h-7 ${isRanked ? 'text-primary-blue' : 'text-gray-400'}`} />
                </div>
                <div>
                  <div className={`text-xl font-bold ${isRanked ? 'text-white' : 'text-gray-300'}`}>
                    Ranked
                  </div>
                  <div className={`text-sm ${isRanked ? 'text-primary-blue' : 'text-gray-500'}`}>
                    Compete for glory
                  </div>
                </div>
              </div>
              {/* Radio indicator */}
              <div className={`flex h-7 w-7 items-center justify-center rounded-full border-2 shrink-0 transition-colors ${
                isRanked ? 'border-primary-blue bg-primary-blue' : 'border-gray-500'
              }`}>
                {isRanked && <Check className="w-4 h-4 text-white" />}
              </div>
            </div>

            {/* Emotional tagline */}
            <p className={`text-sm ${isRanked ? 'text-gray-300' : 'text-gray-500'}`}>
              Your results matter. Build your reputation in the global standings and climb the ranks.
            </p>

            {/* Features */}
            <div className="space-y-2.5 py-2">
              <div className="flex items-center gap-2 text-sm text-gray-400">
                <Check className="w-4 h-4 text-performance-green" />
                <span>Discoverable by all drivers</span>
              </div>
              <div className="flex items-center gap-2 text-sm text-gray-400">
                <Check className="w-4 h-4 text-performance-green" />
                <span>Affects driver ratings & rankings</span>
              </div>
              <div className="flex items-center gap-2 text-sm text-gray-400">
                <Check className="w-4 h-4 text-performance-green" />
                <span>Featured on leaderboards</span>
              </div>
            </div>

            {/* Requirement badge */}
            <div className="flex items-center gap-2 mt-auto px-3 py-2 rounded-lg bg-warning-amber/10 border border-warning-amber/20 w-fit">
              <Users className="w-4 h-4 text-warning-amber" />
              <span className="text-xs text-warning-amber font-medium">
                Requires {MIN_RANKED_DRIVERS}+ drivers for competitive integrity
              </span>
            </div>
          </button>

          {/* Info button */}
          <button
            ref={rankedInfoRef}
            type="button"
            onClick={() => setShowRankedFlyout(true)}
            className="absolute top-3 right-3 flex h-7 w-7 items-center justify-center rounded-full text-gray-500 hover:text-primary-blue hover:bg-primary-blue/10 transition-colors"
          >
            <HelpCircle className="w-4 h-4" />
          </button>
        </div>

        {/* Ranked Info Flyout */}
        <InfoFlyout
          isOpen={showRankedFlyout}
          onClose={() => setShowRankedFlyout(false)}
          title="Ranked Leagues"
          anchorRef={rankedInfoRef}
        >
          <div className="space-y-4">
            <p className="text-xs text-gray-400">
              Ranked leagues are competitive series where results matter. Your performance
              affects your driver rating and contributes to global leaderboards.
            </p>
            
            <div className="space-y-2">
              <div className="text-[10px] text-gray-500 uppercase tracking-wide">Requirements</div>
              <ul className="space-y-1.5">
                <li className="flex items-start gap-2 text-xs text-gray-400">
                  <Users className="w-3.5 h-3.5 text-warning-amber shrink-0 mt-0.5" />
                  <span><strong className="text-white">Minimum {MIN_RANKED_DRIVERS} drivers</strong> for competitive integrity</span>
                </li>
                <li className="flex items-start gap-2 text-xs text-gray-400">
                  <Check className="w-3.5 h-3.5 text-performance-green shrink-0 mt-0.5" />
                  <span>Anyone can discover and join your league</span>
                </li>
              </ul>
            </div>

            <div className="space-y-2">
              <div className="text-[10px] text-gray-500 uppercase tracking-wide">Benefits</div>
              <ul className="space-y-1.5">
                <li className="flex items-start gap-2 text-xs text-gray-400">
                  <Trophy className="w-3.5 h-3.5 text-primary-blue shrink-0 mt-0.5" />
                  <span>Results affect driver ratings and rankings</span>
                </li>
                <li className="flex items-start gap-2 text-xs text-gray-400">
                  <Check className="w-3.5 h-3.5 text-performance-green shrink-0 mt-0.5" />
                  <span>Featured in league discovery</span>
                </li>
              </ul>
            </div>
          </div>
        </InfoFlyout>

        {/* Unranked (Private) Option */}
        <div className="relative">
          <button
            type="button"
            disabled={disabled}
            onClick={() => handleVisibilityChange('private')}
            className={`w-full group relative flex flex-col gap-4 p-6 text-left rounded-xl border-2 transition-all duration-200 ${
              !isRanked
                ? 'border-neon-aqua bg-gradient-to-br from-neon-aqua/15 to-neon-aqua/5 shadow-[0_0_30px_rgba(67,201,230,0.2)]'
                : 'border-charcoal-outline bg-iron-gray/30 hover:border-gray-500 hover:bg-iron-gray/50'
            } ${disabled ? 'opacity-60 cursor-not-allowed' : 'cursor-pointer'}`}
          >
            {/* Header */}
            <div className="flex items-start justify-between">
              <div className="flex items-center gap-3">
                <div className={`flex h-14 w-14 items-center justify-center rounded-xl ${
                  !isRanked ? 'bg-neon-aqua/30' : 'bg-charcoal-outline/50'
                }`}>
                  <Users className={`w-7 h-7 ${!isRanked ? 'text-neon-aqua' : 'text-gray-400'}`} />
                </div>
                <div>
                  <div className={`text-xl font-bold ${!isRanked ? 'text-white' : 'text-gray-300'}`}>
                    Unranked
                  </div>
                  <div className={`text-sm ${!isRanked ? 'text-neon-aqua' : 'text-gray-500'}`}>
                    Race with friends
                  </div>
                </div>
              </div>
              {/* Radio indicator */}
              <div className={`flex h-7 w-7 items-center justify-center rounded-full border-2 shrink-0 transition-colors ${
                !isRanked ? 'border-neon-aqua bg-neon-aqua' : 'border-gray-500'
              }`}>
                {!isRanked && <Check className="w-4 h-4 text-deep-graphite" />}
              </div>
            </div>

            {/* Emotional tagline */}
            <p className={`text-sm ${!isRanked ? 'text-gray-300' : 'text-gray-500'}`}>
              Pure racing fun. No pressure, no rankings — just you and your crew hitting the track.
            </p>

            {/* Features */}
            <div className="space-y-2.5 py-2">
              <div className="flex items-center gap-2 text-sm text-gray-400">
                <Check className={`w-4 h-4 ${!isRanked ? 'text-neon-aqua' : 'text-gray-500'}`} />
                <span>Private, invite-only access</span>
              </div>
              <div className="flex items-center gap-2 text-sm text-gray-400">
                <Check className={`w-4 h-4 ${!isRanked ? 'text-neon-aqua' : 'text-gray-500'}`} />
                <span>Zero impact on your rating</span>
              </div>
              <div className="flex items-center gap-2 text-sm text-gray-400">
                <Check className={`w-4 h-4 ${!isRanked ? 'text-neon-aqua' : 'text-gray-500'}`} />
                <span>Perfect for practice & fun</span>
              </div>
            </div>

            {/* Flexibility badge */}
            <div className="flex items-center gap-2 mt-auto px-3 py-2 rounded-lg bg-neon-aqua/10 border border-neon-aqua/20 w-fit">
              <Users className={`w-4 h-4 ${!isRanked ? 'text-neon-aqua' : 'text-gray-400'}`} />
              <span className={`text-xs font-medium ${!isRanked ? 'text-neon-aqua' : 'text-gray-400'}`}>
                Any size — even 2 friends
              </span>
            </div>
          </button>

          {/* Info button */}
          <button
            ref={unrankedInfoRef}
            type="button"
            onClick={() => setShowUnrankedFlyout(true)}
            className="absolute top-3 right-3 flex h-7 w-7 items-center justify-center rounded-full text-gray-500 hover:text-neon-aqua hover:bg-neon-aqua/10 transition-colors"
          >
            <HelpCircle className="w-4 h-4" />
          </button>
        </div>

        {/* Unranked Info Flyout */}
        <InfoFlyout
          isOpen={showUnrankedFlyout}
          onClose={() => setShowUnrankedFlyout(false)}
          title="Unranked Leagues"
          anchorRef={unrankedInfoRef}
        >
          <div className="space-y-4">
            <p className="text-xs text-gray-400">
              Unranked leagues are casual, private series for racing with friends.
              Results don't affect driver ratings, so you can practice and have fun
              without pressure.
            </p>
            
            <div className="space-y-2">
              <div className="text-[10px] text-gray-500 uppercase tracking-wide">Perfect For</div>
              <ul className="space-y-1.5">
                <li className="flex items-start gap-2 text-xs text-gray-400">
                  <Check className="w-3.5 h-3.5 text-neon-aqua shrink-0 mt-0.5" />
                  <span>Private racing with friends</span>
                </li>
                <li className="flex items-start gap-2 text-xs text-gray-400">
                  <Check className="w-3.5 h-3.5 text-neon-aqua shrink-0 mt-0.5" />
                  <span>Practice and training sessions</span>
                </li>
                <li className="flex items-start gap-2 text-xs text-gray-400">
                  <Check className="w-3.5 h-3.5 text-neon-aqua shrink-0 mt-0.5" />
                  <span>Small groups (2+ drivers)</span>
                </li>
              </ul>
            </div>

            <div className="space-y-2">
              <div className="text-[10px] text-gray-500 uppercase tracking-wide">Features</div>
              <ul className="space-y-1.5">
                <li className="flex items-start gap-2 text-xs text-gray-400">
                  <Users className="w-3.5 h-3.5 text-neon-aqua shrink-0 mt-0.5" />
                  <span>Invite-only membership</span>
                </li>
                <li className="flex items-start gap-2 text-xs text-gray-400">
                  <Check className="w-3.5 h-3.5 text-neon-aqua shrink-0 mt-0.5" />
                  <span>Full stats and standings (internal only)</span>
                </li>
              </ul>
            </div>
          </div>
        </InfoFlyout>
      </div>

      {errors?.visibility && (
        <div className="flex items-center gap-2 p-3 rounded-lg bg-warning-amber/10 border border-warning-amber/20">
          <HelpCircle className="w-4 h-4 text-warning-amber shrink-0" />
          <p className="text-xs text-warning-amber">{errors.visibility}</p>
        </div>
      )}

      {/* Contextual info based on selection */}
      <div className={`rounded-xl p-5 border transition-all duration-300 ${
        isRanked
          ? 'bg-primary-blue/5 border-primary-blue/20'
          : 'bg-neon-aqua/5 border-neon-aqua/20'
      }`}>
        <div className="flex items-start gap-3">
          {isRanked ? (
            <>
              <Trophy className="w-5 h-5 text-primary-blue shrink-0 mt-0.5" />
              <div>
                <p className="text-sm font-medium text-white mb-1">Ready to compete</p>
                <p className="text-xs text-gray-400">
                  Your league will be visible to all GridPilot drivers. Results will affect driver ratings
                  and contribute to the global leaderboards. Make sure you have at least {MIN_RANKED_DRIVERS} drivers
                  to ensure competitive integrity.
                </p>
              </div>
            </>
          ) : (
            <>
              <Users className="w-5 h-5 text-neon-aqua shrink-0 mt-0.5" />
              <div>
                <p className="text-sm font-medium text-white mb-1">Private racing awaits</p>
                <p className="text-xs text-gray-400">
                  Your league will be invite-only. Perfect for racing with friends, practice sessions,
                  or any time you want to have fun without affecting your official ratings.
                </p>
              </div>
            </>
          )}
        </div>
      </div>
    </div>
  );
}