'use client'

import { useState, useRef } from 'react'
import { Upload, Link as LinkIcon, Sparkles, X, Image as ImageIcon } from 'lucide-react'
import { AppIcon } from './AppIcon'
import { cn } from '@/lib/utils'

interface IconPickerProps {
  value: string
  onChange: (val: string) => void
  appName: string
}

const PRESET_EMOJIS = [
  '📱', '🚀', '🛍️', '💳', '⚡', '🛡️', '🤖', '📦',
  '🎮', '📊', '🎧', '💬', '🌐', '🔒', '🍔', '🚗',
  '✈️', '📈', '🎨', '🎵', '🏥', '🏢', '⚙️', '🔑'
]

export function IconPicker({ value, onChange, appName }: IconPickerProps) {
  const [activeTab, setActiveTab] = useState<'presets' | 'url' | 'upload'>('presets')
  const [urlInput, setUrlInput] = useState(value?.startsWith('http') ? value : '')
  const fileInputRef = useRef<HTMLInputElement>(null)

  function handleEmojiSelect(emoji: string) {
    onChange(emoji)
  }

  function handleUrlChange(url: string) {
    setUrlInput(url)
    onChange(url)
  }

  function handleFileUpload(e: React.ChangeEvent<HTMLInputElement>) {
    const file = e.target.files?.[0]
    if (!file) return

    // Limit size to 1.5MB
    if (file.size > 1.5 * 1024 * 1024) {
      alert('İkon boyutu 1.5MB\'dan küçük olmalıdır.')
      return
    }

    const reader = new FileReader()
    reader.onload = () => {
      if (typeof reader.result === 'string') {
        onChange(reader.result)
      }
    }
    reader.readAsDataURL(file)
  }

  function handleClear() {
    onChange('')
    setUrlInput('')
    if (fileInputRef.current) {
      fileInputRef.current.value = ''
    }
  }

  return (
    <div className="space-y-3">
      <div className="flex items-center justify-between">
        <label className="block text-xs font-semibold text-slate-300 uppercase tracking-wider">
          Uygulama İkonu <span className="text-slate-500 font-normal lowercase">(isteğe bağlı)</span>
        </label>
        {value && (
          <button
            type="button"
            onClick={handleClear}
            className="text-[11px] text-rose-400 hover:text-rose-300 flex items-center gap-1 transition-colors"
          >
            <X className="w-3 h-3" />
            <span>İkonu Kaldır</span>
          </button>
        )}
      </div>

      <div className="p-4 rounded-2xl bg-slate-900/70 border border-slate-800 space-y-4">
        {/* Live Preview & Tabs Header */}
        <div className="flex items-center gap-4 pb-3 border-b border-slate-800/80">
          <div className="flex flex-col items-center gap-1.5">
            <AppIcon name={appName || 'A'} iconUrl={value} size="lg" className="ring-2 ring-emerald-500/20" />
            <span className="text-[10px] text-slate-500 font-medium">Önizleme</span>
          </div>

          {/* Mode Switcher */}
          <div className="flex-1 flex gap-1 p-1 bg-slate-950/80 rounded-xl border border-slate-800">
            <button
              type="button"
              onClick={() => setActiveTab('presets')}
              className={cn(
                'flex-1 py-1.5 px-2 rounded-lg text-xs font-medium transition-all flex items-center justify-center gap-1.5',
                activeTab === 'presets' ? 'bg-slate-800 text-emerald-400 shadow-sm' : 'text-slate-400 hover:text-white'
              )}
            >
              <Sparkles className="w-3 h-3" />
              <span>Hazır İkonlar</span>
            </button>

            <button
              type="button"
              onClick={() => setActiveTab('upload')}
              className={cn(
                'flex-1 py-1.5 px-2 rounded-lg text-xs font-medium transition-all flex items-center justify-center gap-1.5',
                activeTab === 'upload' ? 'bg-slate-800 text-emerald-400 shadow-sm' : 'text-slate-400 hover:text-white'
              )}
            >
              <Upload className="w-3 h-3" />
              <span>Görsel Yükle</span>
            </button>

            <button
              type="button"
              onClick={() => setActiveTab('url')}
              className={cn(
                'flex-1 py-1.5 px-2 rounded-lg text-xs font-medium transition-all flex items-center justify-center gap-1.5',
                activeTab === 'url' ? 'bg-slate-800 text-emerald-400 shadow-sm' : 'text-slate-400 hover:text-white'
              )}
            >
              <LinkIcon className="w-3 h-3" />
              <span>URL</span>
            </button>
          </div>
        </div>

        {/* Tab 1: Presets */}
        {activeTab === 'presets' && (
          <div className="grid grid-cols-8 sm:grid-cols-12 gap-1.5 animate-fade-in">
            {PRESET_EMOJIS.map((emoji) => (
              <button
                key={emoji}
                type="button"
                onClick={() => handleEmojiSelect(emoji)}
                className={cn(
                  'h-9 rounded-xl flex items-center justify-center text-lg transition-all hover:scale-110 hover:bg-slate-800',
                  value === emoji
                    ? 'bg-emerald-500/20 ring-2 ring-emerald-400'
                    : 'bg-slate-900/60 border border-slate-800/60'
                )}
              >
                {emoji}
              </button>
            ))}
          </div>
        )}

        {/* Tab 2: Upload */}
        {activeTab === 'upload' && (
          <div className="space-y-2 animate-fade-in">
            <input
              type="file"
              ref={fileInputRef}
              onChange={handleFileUpload}
              accept="image/png, image/jpeg, image/webp, image/svg+xml"
              className="hidden"
            />
            <button
              type="button"
              onClick={() => fileInputRef.current?.click()}
              className="w-full py-4 border-2 border-dashed border-slate-700/80 hover:border-emerald-500/50 rounded-xl bg-slate-950/40 hover:bg-slate-900/40 flex flex-col items-center justify-center gap-1.5 transition-colors cursor-pointer"
            >
              <Upload className="w-5 h-5 text-emerald-400" />
              <span className="text-xs font-semibold text-slate-300">
                Görsel Seçin veya Sürükleyin
              </span>
              <span className="text-[10px] text-slate-500">
                PNG, JPG, WebP veya SVG (Önerilen: 256x256)
              </span>
            </button>
          </div>
        )}

        {/* Tab 3: URL */}
        {activeTab === 'url' && (
          <div className="space-y-2 animate-fade-in">
            <div className="flex items-center glass-input rounded-xl overflow-hidden">
              <span className="px-3 text-slate-500 text-xs border-r border-slate-800 py-2.5">
                https://
              </span>
              <input
                type="url"
                value={urlInput}
                onChange={(e) => handleUrlChange(e.target.value)}
                placeholder="ornek.com/logo.png"
                className="flex-1 bg-transparent px-3 py-2 text-white text-xs font-mono placeholder-slate-500 focus:outline-none"
              />
            </div>
            <p className="text-[11px] text-slate-500">
              CDN veya harici doğrudan görsel linki yapıştırın.
            </p>
          </div>
        )}
      </div>
    </div>
  )
}