// Setup Wizard - пошаговая настройка после создания подписки
'use client';

import { useState, useEffect } from 'react';
import { X, ChevronLeft, Laptop, Smartphone, Check, Copy, QrCode } from 'lucide-react';

interface SetupWizardProps {
  isOpen: boolean;
  onClose: () => void;
  subscriptionUrl: string;
  username: string;
  planType: 'trial' | 'basic' | 'extended' | 'premium';
  expiryDate?: string;
}

type Step = 'device' | 'app-check' | 'location' | 'final';
type DeviceType = 'desktop' | 'mobile' | null;
type MobileOS = 'android' | 'ios' | null;

export default function SetupWizard({
  isOpen,
  onClose,
  subscriptionUrl,
  username,
  planType,
  expiryDate
}: SetupWizardProps) {
  const [step, setStep] = useState<Step>('device');
  const [deviceType, setDeviceType] = useState<DeviceType>(null);
  const [mobileOS, setMobileOS] = useState<MobileOS>(null);
  const [hasApp, setHasApp] = useState<boolean | null>(null);
  const [selectedLocations, setSelectedLocations] = useState<string[]>([]);
  const [copied, setCopied] = useState(false);
  const [showQR, setShowQR] = useState(false);
  const [qrDataUrl, setQrDataUrl] = useState<string>('');

  // Генерация QR кода при открытии финального шага
  useEffect(() => {
    if (step === 'final' && subscriptionUrl && !qrDataUrl) {
      import('qrcode').then((QRCode) => {
        QRCode.toDataURL(subscriptionUrl, {
          width: 300,
          margin: 2,
          color: {
            dark: '#000000',
            light: '#FFFFFF',
          },
          errorCorrectionLevel: 'H',
        })
          .then((dataUrl) => {
            setQrDataUrl(dataUrl);
          })
          .catch((err) => {
            console.error('Failed to generate QR code:', err);
          });
      });
    }
  }, [step, subscriptionUrl, qrDataUrl]);

  // Локации для выбора (для тарифа "Расширенный")
  const locations = [
    { id: 'nl', name: '🇳🇱 Нидерланды', ping: '15ms' },
    { id: 'de', name: '🇩🇪 Германия', ping: '20ms' },
    { id: 'us', name: '🇺🇸 США', ping: '120ms' },
    { id: 'sg', name: '🇸🇬 Сингапур', ping: '180ms' },
    { id: 'jp', name: '🇯🇵 Япония', ping: '160ms' },
    { id: 'uk', name: '🇬🇧 Великобритания', ping: '35ms' },
  ];

  const needsLocationSelection = planType === 'extended';
  const maxLocations = planType === 'extended' ? 3 : 1;

  const handleCopy = async () => {
    await navigator.clipboard.writeText(subscriptionUrl);
    setCopied(true);
    setTimeout(() => setCopied(false), 2000);
  };

  const handleDeviceSelect = (type: DeviceType) => {
    setDeviceType(type);
    if (type === 'desktop') {
      setStep('app-check');
    } else {
      setStep('app-check');
    }
  };

  const handleAppCheck = (installed: boolean) => {
    setHasApp(installed);
    if (needsLocationSelection) {
      setStep('location');
    } else {
      setStep('final');
    }
  };

  const handleLocationToggle = (locationId: string) => {
    if (selectedLocations.includes(locationId)) {
      setSelectedLocations(selectedLocations.filter(id => id !== locationId));
    } else if (selectedLocations.length < maxLocations) {
      setSelectedLocations([...selectedLocations, locationId]);
    }
  };

  const canProceedFromLocation = selectedLocations.length === maxLocations;

  const getProgressSteps = () => {
    const steps = ['device', 'app-check'];
    if (needsLocationSelection) steps.push('location');
    steps.push('final');
    return steps;
  };

  const currentStepIndex = getProgressSteps().indexOf(step);
  const totalSteps = getProgressSteps().length;

  if (!isOpen) return null;

  return (
    <div className="fixed inset-0 bg-black/90 backdrop-blur-sm flex items-center justify-center z-50 p-4">
      <div className="rounded-2xl max-w-md w-full relative border shadow-2xl" style={{ background: 'var(--bg-card)', borderColor: 'var(--border)' }}>
        {/* Header */}
        <div className="p-6 border-b" style={{ borderColor: 'var(--border)' }}>
          <div className="flex items-center justify-between mb-4">
            <button
              onClick={() => {
                if (step === 'device') {
                  onClose();
                } else if (step === 'app-check') {
                  setStep('device');
                } else if (step === 'location') {
                  setStep('app-check');
                } else if (step === 'final') {
                  if (needsLocationSelection) {
                    setStep('location');
                  } else {
                    setStep('app-check');
                  }
                }
              }}
              className="transition-colors"
              style={{ color: 'var(--text-primary)' }}
            >
              {step === 'device' ? <X className="h-6 w-6" /> : <ChevronLeft className="h-6 w-6" />}
            </button>
            <h2 className="text-xl font-bold" style={{ color: 'var(--text-white)' }}>
              {step === 'device' && '🎉 Подписка создана!'}
              {step === 'app-check' && deviceType === 'desktop' && '💻 Настройка'}
              {step === 'app-check' && deviceType === 'mobile' && '📱 Настройка'}
              {step === 'location' && '🌍 Выбор локаций'}
              {step === 'final' && '✨ Всё готово!'}
            </h2>
            <div className="w-6" />
          </div>

          {/* Progress bar */}
          <div className="flex gap-2">
            {Array.from({ length: totalSteps }).map((_, i) => (
              <div
                key={i}
                className="h-1 flex-1 rounded-full transition-colors"
                style={{
                  backgroundColor: i <= currentStepIndex ? 'var(--primary)' : 'var(--border)'
                }}
              />
            ))}
          </div>
        </div>

        {/* Content */}
        <div className="p-6">
          {/* Step 1: Device Selection */}
          {step === 'device' && (
            <div className="space-y-4">
              <p className="text-center mb-6" style={{ color: 'var(--text-primary)' }}>
                {expiryDate ? `Действует до ${expiryDate}` : 'Осталось 2 шага до подключения'}
              </p>

              <p className="font-medium text-center mb-4" style={{ color: 'var(--text-white)' }}>
                Какое у вас устройство?
              </p>

              <div className="grid grid-cols-2 gap-4">
                <button
                  onClick={() => handleDeviceSelect('desktop')}
                  className="p-6 rounded-xl transition-all group border-2"
                  style={{ background: 'var(--bg-elevated)', borderColor: 'var(--border)' }}
                >
                  <Laptop className="h-12 w-12 mx-auto mb-3 group-hover:scale-110 transition-transform" style={{ color: 'var(--primary)' }} />
                  <p className="font-medium" style={{ color: 'var(--text-white)' }}>Компьютер</p>
                </button>

                <button
                  onClick={() => handleDeviceSelect('mobile')}
                  className="p-6 rounded-xl transition-all group border-2"
                  style={{ background: 'var(--bg-elevated)', borderColor: 'var(--border)' }}
                >
                  <Smartphone className="h-12 w-12 mx-auto mb-3 group-hover:scale-110 transition-transform" style={{ color: 'var(--primary)' }} />
                  <p className="font-medium" style={{ color: 'var(--text-white)' }}>Телефон</p>
                </button>
              </div>
            </div>
          )}

          {/* Step 2: App Check */}
          {step === 'app-check' && deviceType === 'desktop' && (
            <div className="space-y-4">
              <p className="text-white font-medium text-center mb-4">
                У вас установлен Umbrix?
              </p>

              <div className="grid grid-cols-2 gap-4">
                <button
                  onClick={() => handleAppCheck(true)}
                  className="p-6 rounded-xl transition-all border-2"
                  style={{ background: 'var(--bg-elevated)', borderColor: 'var(--border)' }}
                >
                  <Check className="h-12 w-12 mx-auto mb-3" style={{ color: 'var(--success)' }} />
                  <p className="font-medium" style={{ color: 'var(--text-white)' }}>Да</p>
                </button>

                <button
                  onClick={() => handleAppCheck(false)}
                  className="p-6 rounded-xl transition-all border-2"
                  style={{ background: 'var(--bg-elevated)', borderColor: 'var(--border)' }}
                >
                  <X className="h-12 w-12 mx-auto mb-3" style={{ color: 'var(--error)' }} />
                  <p className="font-medium" style={{ color: 'var(--text-white)' }}>Нет</p>
                </button>
              </div>

              {hasApp === false && (
                <div className="mt-6 p-4 rounded-xl" style={{ background: 'rgba(47, 190, 165, 0.1)', borderWidth: '1px', borderStyle: 'solid', borderColor: 'var(--primary)' }}>
                  <p style={{ color: 'var(--text-white)' }} className="font-medium mb-3">Скачайте Umbrix:</p>
                  <div className="flex flex-col gap-2">
                    <a
                      href="https://umbrix.net/download"
                      target="_blank"
                      rel="noopener noreferrer"
                      className="px-4 py-2 rounded-lg font-medium transition-colors text-center"
                      style={{ background: 'var(--primary)', color: 'var(--text-white)' }}
                      onMouseEnter={e => e.currentTarget.style.background = 'var(--primary-dark)'}
                      onMouseLeave={e => e.currentTarget.style.background = 'var(--primary)'}
                    >
                      🪟 Windows
                    </a>
                    <a
                      href="https://umbrix.net/download"
                      target="_blank"
                      rel="noopener noreferrer"
                      className="px-4 py-2 rounded-lg font-medium transition-colors text-center"
                      style={{ background: 'var(--primary)', color: 'var(--text-white)' }}
                      onMouseEnter={e => e.currentTarget.style.background = 'var(--primary-dark)'}
                      onMouseLeave={e => e.currentTarget.style.background = 'var(--primary)'}
                    >
                      🍎 macOS
                    </a>
                    <a
                      href="https://umbrix.net/download"
                      target="_blank"
                      rel="noopener noreferrer"
                      className="px-4 py-2 rounded-lg font-medium transition-colors text-center"
                      style={{ background: 'var(--primary)', color: 'var(--text-white)' }}
                      onMouseEnter={e => e.currentTarget.style.background = 'var(--primary-dark)'}
                      onMouseLeave={e => e.currentTarget.style.background = 'var(--primary)'}
                    >
                      🐧 Linux
                    </a>
                  </div>
                  <button
                    onClick={() => setStep(needsLocationSelection ? 'location' : 'final')}
                    className="w-full mt-4 px-4 py-2 rounded-lg font-medium transition-colors"
                    style={{ background: 'var(--bg-elevated)', color: 'var(--text-white)' }}
                    onMouseEnter={e => e.currentTarget.style.background = 'var(--border)'}
                    onMouseLeave={e => e.currentTarget.style.background = 'var(--bg-elevated)'}
                  >
                    ➡️ Уже установил, далее
                  </button>
                </div>
              )}
            </div>
          )}

          {step === 'app-check' && deviceType === 'mobile' && (
            <div className="space-y-4">
              <p className="text-white font-medium text-center mb-4">
                Какая у вас система?
              </p>

              <div className="grid grid-cols-2 gap-4">
                <button
                  onClick={() => {
                    setMobileOS('android');
                    setHasApp(null);
                  }}
                  className="p-6 rounded-xl border-2 transition-all"
                  style={{ background: 'var(--bg-elevated)', borderColor: 'var(--border)' }}
                  onMouseEnter={e => e.currentTarget.style.borderColor = 'var(--success)'}
                  onMouseLeave={e => e.currentTarget.style.borderColor = 'var(--border)'}
                >
                  <div className="text-4xl mb-3">🤖</div>
                  <p className="font-medium" style={{ color: 'var(--text-white)' }}>Android</p>
                </button>

                <button
                  onClick={() => {
                    setMobileOS('ios');
                    setHasApp(null);
                  }}
                  className="p-6 rounded-xl border-2 transition-all"
                  style={{ background: 'var(--bg-elevated)', borderColor: 'var(--border)' }}
                  onMouseEnter={e => e.currentTarget.style.borderColor = 'var(--text-white)'}
                  onMouseLeave={e => e.currentTarget.style.borderColor = 'var(--border)'}
                >
                  <div className="text-4xl mb-3">🍎</div>
                  <p className="font-medium" style={{ color: 'var(--text-white)' }}>iOS</p>
                </button>
              </div>

              {mobileOS && (
                <div className="mt-6">
                  <p className="text-white font-medium mb-3">У вас уже установлено приложение?</p>
                  
                  <div className="grid grid-cols-2 gap-4 mb-4">
                    <button
                      onClick={() => handleAppCheck(true)}
                      className="px-4 py-3 bg-green-600 hover:bg-green-700 rounded-lg text-white font-medium transition-colors"
                    >
                      ✅ Да
                    </button>
                    <button
                      onClick={() => setHasApp(false)}
                      className="px-4 py-3 rounded-lg font-medium transition-colors"
                      style={{ background: 'var(--bg-elevated)', color: 'var(--text-white)' }}
                      onMouseEnter={e => e.currentTarget.style.background = 'var(--border)'}
                      onMouseLeave={e => e.currentTarget.style.background = 'var(--bg-elevated)'}
                    >
                      ❌ Нет
                    </button>
                  </div>

                  {hasApp === false && (
                    <div className="p-4 rounded-xl" style={{ background: 'rgba(47, 190, 165, 0.1)', borderWidth: '1px', borderStyle: 'solid', borderColor: 'var(--primary)' }}>
                      <p className="text-sm mb-2" style={{ color: 'var(--text-primary)' }}>Рекомендуем:</p>
                      {mobileOS === 'android' ? (
                        <div className="space-y-2">
                          <div style={{ color: 'var(--text-white)' }}>• V2RayNG</div>
                          <div style={{ color: 'var(--text-white)' }}>• Hiddify</div>
                          <div style={{ color: 'var(--text-white)' }}>• v2rayTun</div>
                        </div>
                      ) : (
                        <div className="space-y-2">
                          <div style={{ color: 'var(--text-white)' }}>• Shadowrocket (AppStore)</div>
                          <div style={{ color: 'var(--text-white)' }}>• Hiddify (AppStore)</div>
                        </div>
                      )}
                      <button
                        onClick={() => handleAppCheck(true)}
                        className="w-full mt-4 px-4 py-2 rounded-lg font-medium transition-colors"
                        style={{ background: 'var(--primary)', color: 'var(--text-white)' }}
                        onMouseEnter={e => e.currentTarget.style.background = 'var(--primary-dark)'}
                        onMouseLeave={e => e.currentTarget.style.background = 'var(--primary)'}
                      >
                        ➡️ Уже установил, далее
                      </button>
                    </div>
                  )}
                </div>
              )}
            </div>
          )}

          {/* Step 3: Location Selection (только для extended тарифа) */}
          {step === 'location' && (
            <div className="space-y-4">
              <p className="text-white font-medium text-center mb-2">
                Выберите {maxLocations} локации
              </p>
              <p className="text-slate-400 text-sm text-center mb-4">
                Выбрано: {selectedLocations.length} из {maxLocations}
              </p>

              <div className="space-y-2 max-h-[300px] overflow-y-auto">
                {locations.map((location) => {
                  const isSelected = selectedLocations.includes(location.id);
                  const canSelect = selectedLocations.length < maxLocations;

                  return (
                    <button
                      key={location.id}
                      onClick={() => handleLocationToggle(location.id)}
                      disabled={!isSelected && !canSelect}
                      className="w-full p-4 rounded-xl border-2 transition-all flex items-center justify-between"
                      style={{
                        background: isSelected ? 'rgba(47, 190, 165, 0.2)' : canSelect ? 'var(--bg-elevated)' : 'var(--bg-card)',
                        borderColor: isSelected ? 'var(--primary)' : 'var(--border)',
                        opacity: canSelect || isSelected ? 1 : 0.5,
                        cursor: canSelect || isSelected ? 'pointer' : 'not-allowed'
                      }}
                      onMouseEnter={e => { if (canSelect && !isSelected) e.currentTarget.style.borderColor = 'var(--text-primary)' }}
                      onMouseLeave={e => { if (!isSelected) e.currentTarget.style.borderColor = 'var(--border)' }}
                    >
                      <div className="flex items-center gap-3">
                        <div className="w-5 h-5 rounded border-2 flex items-center justify-center" style={{
                          background: isSelected ? 'var(--primary)' : 'transparent',
                          borderColor: isSelected ? 'var(--primary)' : 'var(--border)'
                        }}>
                          {isSelected && <Check className="h-4 w-4" style={{ color: 'var(--text-white)' }} />}
                        </div>
                        <span className="font-medium" style={{ color: 'var(--text-white)' }}>{location.name}</span>
                      </div>
                      <span className="text-sm" style={{ color: 'var(--text-primary)' }}>{location.ping}</span>
                    </button>
                  );
                })}
              </div>

              <button
                onClick={() => setStep('final')}
                disabled={!canProceedFromLocation}
                className="w-full py-3 rounded-xl font-medium transition-colors"
                style={{
                  background: canProceedFromLocation ? 'var(--primary)' : 'var(--bg-elevated)',
                  color: canProceedFromLocation ? 'var(--text-white)' : 'var(--text-primary)',
                  cursor: canProceedFromLocation ? 'pointer' : 'not-allowed',
                  opacity: canProceedFromLocation ? 1 : 0.5
                }}
                onMouseEnter={e => { if (canProceedFromLocation) e.currentTarget.style.background = 'var(--primary-dark)' }}
                onMouseLeave={e => { if (canProceedFromLocation) e.currentTarget.style.background = 'var(--primary)' }}
              >
                {canProceedFromLocation ? '➡️ Продолжить' : `Выберите ещё ${maxLocations - selectedLocations.length}`}
              </button>
            </div>
          )}

          {/* Step 4: Final - Show Link/QR */}
          {step === 'final' && (
            <div className="space-y-4">
              <div className="text-center mb-6">
                <div className="text-4xl mb-3">🎉</div>
                <p className="text-sm" style={{ color: 'var(--text-primary)' }}>
                  {deviceType === 'desktop' ? 'Скопируйте ссылку и вставьте в Umbrix' : 'Отсканируйте QR код или скопируйте ссылку'}
                </p>
              </div>

              <button
                onClick={handleCopy}
                className="w-full p-4 rounded-xl border-2 transition-all group"
                style={{ background: 'var(--bg-elevated)', borderColor: 'var(--border)' }}
                onMouseEnter={e => e.currentTarget.style.borderColor = 'var(--primary)'}
                onMouseLeave={e => e.currentTarget.style.borderColor = 'var(--border)'}
              >
                <div className="flex items-center justify-between">
                  <span className="font-medium" style={{ color: 'var(--text-white)' }}>
                    {copied ? '✅ Скопировано!' : '📋 Скопировать ссылку'}
                  </span>
                  <Copy className="h-5 w-5 transition-colors" style={{ color: copied ? 'var(--success)' : 'var(--text-primary)' }} />
                </div>
              </button>

              {deviceType === 'mobile' && (
                <button
                  onClick={() => setShowQR(!showQR)}
                  className="w-full p-4 rounded-xl border-2 transition-all group"
                  style={{ background: 'var(--bg-elevated)', borderColor: 'var(--border)' }}
                  onMouseEnter={e => e.currentTarget.style.borderColor = 'var(--primary)'}
                  onMouseLeave={e => e.currentTarget.style.borderColor = 'var(--border)'}
                >
                  <div className="flex items-center justify-between">
                    <span className="font-medium" style={{ color: 'var(--text-white)' }}>
                      {showQR ? '📱 Скрыть QR код' : '📱 Показать QR код'}
                    </span>
                    <QrCode className="h-5 w-5 transition-colors" style={{ color: 'var(--text-primary)' }} />
                  </div>
                </button>
              )}

              {showQR && qrDataUrl && (
                <div className="p-6 rounded-xl" style={{ background: 'var(--text-white)' }}>
                  <img 
                    src={qrDataUrl} 
                    alt="QR код подписки" 
                    className="w-full h-auto"
                  />
                  <div className="mt-3 text-center text-xs break-all" style={{ color: 'var(--bg-card)' }}>
                    {subscriptionUrl}
                  </div>
                </div>
              )}

              <div className="pt-4 mt-4" style={{ borderTop: '1px solid var(--border)' }}>
                <button
                  onClick={onClose}
                  className="w-full p-4 rounded-xl transition-colors font-medium"
                  style={{ background: 'var(--bg-elevated)', color: 'var(--text-white)' }}
                  onMouseEnter={e => e.currentTarget.style.background = 'var(--border)'}
                  onMouseLeave={e => e.currentTarget.style.background = 'var(--bg-elevated)'}
                >
                  📖 Нужна помощь? Открыть инструкцию
                </button>
              </div>
            </div>
          )}
        </div>
      </div>
    </div>
  );
}