import { useState, useMemo } from 'react';

interface KaomojiItem {
  emoji: string;
  tags: string[];
}

interface Category {
  name: string;
  tabLabel: string;
  items: KaomojiItem[];
}

const KAOMOJI_CATEGORIES: Category[] = [
  {
    name: 'Bear (Kuma)',
    tabLabel: 'Bear',
    items: [
      { emoji: 'ʕ•ᴥ•ʔ', tags: ['bear', 'kuma', 'animal', 'happy', 'neutral', 'cute'] },
      { emoji: 'ʕっ•ᴥ•ʔっ', tags: ['bear', 'kuma', 'hug', 'love', 'happy', 'cute'] },
      { emoji: 'ʕ•ᴥ•ʔﾉ♡', tags: ['bear', 'kuma', 'love', 'wave', 'happy', 'cute'] },
      { emoji: 'ʕ º ᴥ º ʔ', tags: ['bear', 'kuma', 'surprised', 'shocked', 'gasp'] },
      { emoji: 'ʕ◕ᴥ◕ʔ', tags: ['bear', 'kuma', 'cute', 'happy', 'smile'] },
      { emoji: 'ʕ ; ᴥ ; ʔ', tags: ['bear', 'kuma', 'sad', 'crying', 'tear'] },
      { emoji: 'ʕಠᴥಠʔ', tags: ['bear', 'kuma', 'angry', 'mad', 'glare'] },
      { emoji: 'ʕ*ﾉᴥﾉʔ', tags: ['bear', 'kuma', 'shy', 'blush', 'cute'] },
      { emoji: 'ʕ⊙ᴥ⊙ʔ', tags: ['bear', 'kuma', 'shocked', 'surprised', 'gasp'] },
      { emoji: 'ʕ/•ᴥ•ʔ/', tags: ['bear', 'kuma', 'happy', 'celebrate', 'dance'] },
      { emoji: 'ʕ·ᴥ·ʔ', tags: ['bear', 'kuma', 'small', 'cute', 'neutral'] },
      { emoji: '⊂(￣(ｴ)￣)⊃', tags: ['bear', 'kuma', 'big', 'hug', 'animal'] },
      { emoji: '(●￣(ｴ)￣●)', tags: ['bear', 'kuma', 'chubby', 'cute', 'neutral'] },
      { emoji: 'ʕ •ᴥ•ʔゝ☆', tags: ['bear', 'kuma', 'magic', 'star', 'happy'] },
      { emoji: 'ʕ•ᴥ•ʔ/', tags: ['bear', 'kuma', 'wave', 'hello', 'happy'] },
      { emoji: 'ʕっ•ᴥ•ʔ', tags: ['bear', 'kuma', 'reach', 'cute'] },
      { emoji: 'ʕ ⊃･ ｪ ･ ʔ⊃', tags: ['bear', 'kuma', 'hug', 'reach'] },
      { emoji: 'ʕ ꈍ ᴥ ꈍ ʔ', tags: ['bear', 'kuma', 'shy', 'happy', 'smug'] },
      { emoji: 'ʕ ·(ｪ)· ʔ', tags: ['bear', 'kuma', 'classic', 'neutral'] },
    ]
  },
  {
    name: 'Happy / Laughing',
    tabLabel: 'Joy',
    items: [
      { emoji: '(^_^)', tags: ['happy', 'smile', 'classic', 'joy'] },
      { emoji: '(^o^)', tags: ['happy', 'laugh', 'excited', 'joy'] },
      { emoji: '(*^ω^*)', tags: ['happy', 'cute', 'smile', 'blush'] },
      { emoji: '(≧▽≦)', tags: ['happy', 'laugh', 'excited', 'joy', 'grin'] },
      { emoji: '(✿◠‿◠)', tags: ['happy', 'flower', 'cute', 'smile', 'peace'] },
      { emoji: '(•‿•)', tags: ['happy', 'smile', 'cute'] },
      { emoji: '(o^^o)', tags: ['happy', 'cute', 'blush', 'smile'] },
      { emoji: '( ‘‿’ )', tags: ['happy', 'smile', 'cute'] },
      { emoji: '＼(〇‿〇)／', tags: ['happy', 'celebrate', 'excited', 'dance'] },
      { emoji: '(◕‿◕)', tags: ['happy', 'smile', 'cute'] },
      { emoji: '(>ω<)', tags: ['happy', 'excited', 'cute', 'joy'] },
      { emoji: '(★ω★)', tags: ['happy', 'excited', 'star', 'sparkle', 'eyes'] },
      { emoji: '(*^.^*)', tags: ['happy', 'smile', 'cute', 'shy'] },
    ]
  },
  {
    name: 'Sad / Crying',
    tabLabel: 'Sad',
    items: [
      { emoji: '(T_T)', tags: ['sad', 'crying', 'tear', 'classic'] },
      { emoji: '(ಥ﹏ಥ)', tags: ['sad', 'crying', 'tear', 'cute', 'pity'] },
      { emoji: '(;_;)', tags: ['sad', 'crying', 'tear'] },
      { emoji: '(._.)', tags: ['sad', 'depressed', 'down', 'neutral'] },
      { emoji: '(._. )', tags: ['sad', 'depressed', 'down', 'shy'] },
      { emoji: '(╥﹏╥)', tags: ['sad', 'crying', 'tear', 'heavy'] },
      { emoji: '((>_<))', tags: ['sad', 'worried', 'frustrated', 'nervous'] },
      { emoji: '(#>_<)', tags: ['sad', 'frustrated', 'mad', 'angry'] },
      { emoji: '(;﹏;)', tags: ['sad', 'crying', 'tear'] },
    ]
  },
  {
    name: 'Angry / Glaring',
    tabLabel: 'Mad',
    items: [
      { emoji: '(ಠ_ಠ)', tags: ['angry', 'mad', 'glare', 'disapproval', 'look'] },
      { emoji: '(╯°□°）╯︵ ┻━┻', tags: ['angry', 'mad', 'table', 'flip', 'rage'] },
      { emoji: '┬─┬ノ( º _ ºノ)', tags: ['neutral', 'table', 'put', 'back', 'calm'] },
      { emoji: '(＃｀д´)ﾉ', tags: ['angry', 'mad', 'yell', 'shake'] },
      { emoji: '(￢_￢)', tags: ['suspicious', 'glare', 'annoyed', 'side-eye'] },
      { emoji: '(￣︿￣)', tags: ['annoyed', 'disappointed', 'unhappy'] },
      { emoji: '(╬ಠ益ಠ)', tags: ['angry', 'mad', 'rage', 'furious'] },
      { emoji: '(凸ಠ益ಠ)凸', tags: ['angry', 'mad', 'middle', 'finger', 'rage'] },
    ]
  },
  {
    name: 'Shy / Cute',
    tabLabel: 'Shy',
    items: [
      { emoji: '(*n_n*)', tags: ['shy', 'blush', 'cute', 'smile'] },
      { emoji: '(*ﾉ∀`*)', tags: ['shy', 'blush', 'embarrassed', 'cute'] },
      { emoji: '(ノωヽ)', tags: ['shy', 'blush', 'embarrassed', 'hide', 'cute'] },
      { emoji: '( ꈍ ꈍ )', tags: ['cute', 'shy', 'blush', 'happy'] },
      { emoji: '(⁄ ⁄•⁄ω⁄•⁄ ⁄)', tags: ['cute', 'shy', 'blush', 'super', 'embarrassed'] },
      { emoji: '(❤ω❤)', tags: ['love', 'cute', 'excited', 'heart'] },
    ]
  },
  {
    name: 'Cats & Animals',
    tabLabel: 'Pets',
    items: [
      { emoji: '(=^·^=)', tags: ['cat', 'animal', 'cute', 'happy'] },
      { emoji: '(=^·ｪ·^=)', tags: ['cat', 'animal', 'cute'] },
      { emoji: '(=^ ◡ ^=)', tags: ['cat', 'animal', 'happy', 'smile'] },
      { emoji: '(=^·^=)ﾉ', tags: ['cat', 'animal', 'wave', 'hello'] },
      { emoji: '(◕ᴥ◕)', tags: ['animal', 'cute', 'seal'] },
      { emoji: '(=^ ᆺ ^=)', tags: ['cat', 'animal', 'cute'] },
    ]
  },
  {
    name: 'Action & Funny',
    tabLabel: 'Misc',
    items: [
      { emoji: '¯\\_(ツ)_/¯', tags: ['funny', 'shrug', 'meh', 'whatever'] },
      { emoji: '( ͡° ͜ʖ ͡°)', tags: ['funny', 'lenny', 'smug', 'face'] },
      { emoji: '(ง •̀_•́)ง', tags: ['action', 'fight', 'determined', 'fist'] },
      { emoji: '(′-′)ノ(._.)', tags: ['action', 'pat', 'comfort', 'friend'] },
      { emoji: '(/°▽°)/', tags: ['action', 'happy', 'throw', 'hands'] },
      { emoji: '(°ロ°)', tags: ['surprised', 'shocked', 'gasp'] },
      { emoji: 'ヽ(°〇°)ﾉ', tags: ['surprised', 'shocked', 'amaze'] },
    ]
  }
];

interface EmojiPickerProps {
  onSelect: (emoji: string) => void;
  onClose: () => void;
}

export function EmojiPicker({ onSelect, onClose }: EmojiPickerProps) {
  const [search, setSearch] = useState('');
  const [activeTab, setActiveTab] = useState('All');

  // Search logic (checks emoji or tags matching)
  const searchResults = useMemo(() => {
    if (!search) return [];
    const query = search.toLowerCase().trim();
    const results: KaomojiItem[] = [];
    const seen = new Set<string>();

    for (const cat of KAOMOJI_CATEGORIES) {
      for (const item of cat.items) {
        if (seen.has(item.emoji)) continue;
        const matchesEmoji = item.emoji.includes(query);
        const matchesTags = item.tags.some(tag => tag.includes(query));
        if (matchesEmoji || matchesTags) {
          results.push(item);
          seen.add(item.emoji);
        }
      }
    }
    return results;
  }, [search]);

  // Tab filter logic
  const displayedItems = useMemo(() => {
    if (activeTab === 'All') {
      const all: KaomojiItem[] = [];
      const seen = new Set<string>();
      for (const cat of KAOMOJI_CATEGORIES) {
        for (const item of cat.items) {
          if (!seen.has(item.emoji)) {
            all.push(item);
            seen.add(item.emoji);
          }
        }
      }
      return all;
    }
    const cat = KAOMOJI_CATEGORIES.find(c => c.tabLabel === activeTab);
    return cat ? cat.items : [];
  }, [activeTab]);

  return (
    <div className="absolute bottom-full left-0 mb-1 bg-gb-bg border border-gb-bg-t p-2 w-[340px] max-h-[340px] overflow-y-auto z-50 shadow-lg font-mono">
      <div className="flex items-center justify-between mb-2">
        <span className="text-xs text-gb-fg-f">KAOMOJI PICKER</span>
        <button onClick={onClose} className="text-xs text-gb-red hover:text-gb-orange font-mono">[x]</button>
      </div>

      <input
        type="text"
        value={search}
        onChange={(e) => setSearch(e.target.value)}
        placeholder="search (happy, bear, sad, table...)"
        className="w-full px-2 py-1 mb-2 text-xs bg-gb-bg-s text-gb-fg border border-gb-bg-t outline-none focus:border-gb-orange"
        autoFocus
      />

      {/* Tabs list (only shown if not searching) */}
      {!search && (
        <div className="flex flex-wrap gap-1 mb-2 border-b border-gb-bg-t pb-1.5 text-[10px]">
          <button
            onClick={() => setActiveTab('All')}
            className={`px-1.5 py-0.5 border ${activeTab === 'All' ? 'border-gb-orange text-gb-orange bg-gb-bg-s' : 'border-transparent text-gb-fg-f hover:text-gb-fg'}`}
          >
            [All]
          </button>
          {KAOMOJI_CATEGORIES.map(cat => (
            <button
              key={cat.tabLabel}
              onClick={() => setActiveTab(cat.tabLabel)}
              className={`px-1.5 py-0.5 border ${activeTab === cat.tabLabel ? 'border-gb-orange text-gb-orange bg-gb-bg-s' : 'border-transparent text-gb-fg-f hover:text-gb-fg'}`}
            >
              [{cat.tabLabel}]
            </button>
          ))}
        </div>
      )}

      {/* Emoticons grid */}
      <div className="flex flex-wrap gap-1.5 max-h-56 overflow-y-auto">
        {search ? (
          searchResults.map((item) => (
            <button
              key={item.emoji}
              onClick={() => {
                onSelect(item.emoji);
                onClose();
              }}
              className="px-2 py-1 text-xs bg-gb-bg-s text-gb-fg border border-gb-bg-t hover:border-gb-orange hover:text-gb-orange transition-colors"
              title={item.tags.join(', ')}
            >
              {item.emoji}
            </button>
          ))
        ) : (
          displayedItems.map((item) => (
            <button
              key={item.emoji}
              onClick={() => {
                onSelect(item.emoji);
                onClose();
              }}
              className="px-2 py-1 text-xs bg-gb-bg-s text-gb-fg border border-gb-bg-t hover:border-gb-orange hover:text-gb-orange transition-colors"
              title={item.tags.join(', ')}
            >
              {item.emoji}
            </button>
          ))
        )}
      </div>

      {search && searchResults.length === 0 && (
        <div className="text-xs text-gb-fg-f text-center py-4">[no matches found]</div>
      )}
    </div>
  );
}