'use client'

import { useState } from 'react'
import { useRouter } from 'next/navigation'
import { motion, AnimatePresence } from 'framer-motion'
import { Sparkles, ShieldCheck, Mail, ArrowRight, Loader2, Check, Lock, Building, User } from 'lucide-react'
import { Button } from '@/components/ui/button'
import { Input } from '@/components/ui/input'
import { Label } from '@/components/ui/label'
import { createClient } from '@/lib/supabase/client'
import { completeSetup } from '@/lib/actions/setup'

export function SetupWizard() {
  const router = useRouter()
  const [step, setStep] = useState(1)
  const [loading, setLoading] = useState(false)
  const [errorMsg, setErrorMsg] = useState('')

  // Step 2 Form: Admin account
  const [adminForm, setAdminForm] = useState({
    email: '',
    password: '',
    confirmPassword: '',
    companyName: '',
    firstName: '',
    lastName: '',
  })

  // Step 3 Form: SMTP Config
  const [smtpForm, setSmtpForm] = useState({
    host: '',
    port: '587',
    secure: false,
    user: '',
    pass: '',
  })

  // Validation checks for Admin form
  const isAdminFormValid =
    adminForm.email.includes('@') &&
    adminForm.password.length >= 6 &&
    adminForm.password === adminForm.confirmPassword &&
    adminForm.companyName.trim().length > 0 &&
    adminForm.firstName.trim().length > 0 &&
    adminForm.lastName.trim().length > 0

  // Validation checks for SMTP form
  const isSmtpFormValid =
    smtpForm.host.trim().length > 0 &&
    !isNaN(Number(smtpForm.port)) &&
    smtpForm.user.trim().length > 0

  const handleFinishSetup = async () => {
    if (!isAdminFormValid || !isSmtpFormValid) return
    setLoading(true)
    setErrorMsg('')

    try {
      // 1. Submit details via server action
      const res = await completeSetup(
        {
          email: adminForm.email,
          password: adminForm.password,
          companyName: adminForm.companyName,
          firstName: adminForm.firstName,
          lastName: adminForm.lastName,
        },
        {
          host: smtpForm.host,
          port: Number(smtpForm.port),
          secure: smtpForm.secure,
          user: smtpForm.user,
          pass: smtpForm.pass,
        }
      )

      if (!res.success) {
        setErrorMsg(res.error || 'Fehler beim Setup.')
        setLoading(false)
        return
      }

      // 2. Automatischer Login für flüssiges Erlebnis
      const supabase = createClient()
      const { error: loginError } = await supabase.auth.signInWithPassword({
        email: adminForm.email,
        password: adminForm.password,
      })

      if (loginError) {
        console.error('Auto login failed:', loginError)
        // Redirect anyway since setup is done
      }

      // 3. Weiterleitung
      router.push('/')
      router.refresh()
    } catch (e: any) {
      setErrorMsg(e.message || 'Ein unerwarteter Fehler ist aufgetreten.')
      setLoading(false)
    }
  }

  return (
    <div className="min-h-screen bg-[#020617] text-white flex flex-col items-center justify-center p-4 relative overflow-hidden">
      {/* Dynamic Background Glow */}
      <div className="absolute top-[-10%] left-[-10%] w-[50%] h-[50%] rounded-full bg-blue-500/10 blur-[120px]" />
      <div className="absolute bottom-[-10%] right-[-10%] w-[50%] h-[50%] rounded-full bg-purple-500/10 blur-[120px]" />

      <div className="w-full max-w-xl relative z-10">
        {/* Step Indicator Header */}
        <div className="flex items-center justify-between mb-8 px-2">
          <div className="flex items-center gap-2">
            <span className="text-xl font-bold tracking-tight text-gradient bg-gradient-to-r from-blue-400 to-indigo-400">CASPOS</span>
            <span className="text-xs px-2 py-0.5 rounded-full bg-blue-500/10 text-blue-400 border border-blue-500/20 font-medium">Initialisierung</span>
          </div>
          <div className="flex gap-1.5">
            {[1, 2, 3].map((s) => (
              <div
                key={s}
                className={`h-1.5 rounded-full transition-all duration-300 ${
                  s === step ? 'w-8 bg-blue-500' : 'w-2 bg-slate-800'
                }`}
              />
            ))}
          </div>
        </div>

        <AnimatePresence mode="wait">
          {step === 1 && (
            <motion.div
              key="step1"
              initial={{ opacity: 0, y: 15 }}
              animate={{ opacity: 1, y: 0 }}
              exit={{ opacity: 0, y: -15 }}
              transition={{ duration: 0.3 }}
              className="glass-dark border border-white/10 rounded-3xl p-8 space-y-6 shadow-2xl"
            >
              <div className="w-16 h-16 rounded-2xl bg-blue-500/10 border border-blue-500/20 flex items-center justify-center text-blue-400 mx-auto shadow-inner">
                <Sparkles className="w-8 h-8 animate-pulse" />
              </div>

              <div className="text-center space-y-2">
                <h1 className="text-3xl font-extrabold tracking-tight">Willkommen bei CASPOS!</h1>
                <p className="text-slate-400 leading-relaxed">
                  Richten Sie Ihren persönlichen Lizenz- und Angebots-Shop in wenigen Schritten ein. Wir konfigurieren Ihr Administrator-Konto und die Mailverbindung.
                </p>
              </div>

              <div className="p-4 rounded-xl bg-white/5 border border-white/5 text-sm text-slate-400 space-y-2">
                <div className="flex items-center gap-2">
                  <Check className="w-4 h-4 text-green-400 shrink-0" />
                  <span>Komplett self-hosted & sicher</span>
                </div>
                <div className="flex items-center gap-2">
                  <Check className="w-4 h-4 text-green-400 shrink-0" />
                  <span>Automatische Schema-Updates auf dem neuesten Stand</span>
                </div>
                <div className="flex items-center gap-2">
                  <Check className="w-4 h-4 text-green-400 shrink-0" />
                  <span>SMTP Mailversand für direkte Angebotsbestätigungen</span>
                </div>
              </div>

              <Button
                onClick={() => setStep(2)}
                className="w-full py-6 text-base font-bold bg-gradient-to-r from-blue-600 to-indigo-600 hover:from-blue-500 hover:to-indigo-500 shadow-lg shadow-blue-500/15 group"
              >
                Setup starten
                <ArrowRight className="w-4 h-4 ml-2 group-hover:translate-x-1 transition-transform" />
              </Button>
            </motion.div>
          )}

          {step === 2 && (
            <motion.div
              key="step2"
              initial={{ opacity: 0, y: 15 }}
              animate={{ opacity: 1, y: 0 }}
              exit={{ opacity: 0, y: -15 }}
              transition={{ duration: 0.3 }}
              className="glass-dark border border-white/10 rounded-3xl p-8 space-y-6 shadow-2xl"
            >
              <div className="space-y-1">
                <h2 className="text-2xl font-bold flex items-center gap-2">
                  <ShieldCheck className="w-6 h-6 text-blue-400" />
                  Admin-Konto anlegen
                </h2>
                <p className="text-slate-400 text-sm">
                  Erstellen Sie den ersten Administrator-Benutzer. Dieser erhält vollen Zugriff auf das System.
                </p>
              </div>

              <div className="space-y-4">
                <div className="grid grid-cols-2 gap-4">
                  <div className="space-y-1.5">
                    <Label className="text-slate-300 text-xs">Vorname *</Label>
                    <div className="relative">
                      <User className="absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 text-slate-500" />
                      <Input
                        value={adminForm.firstName}
                        onChange={(e) => setAdminForm({ ...adminForm, firstName: e.target.value })}
                        placeholder="Vorname"
                        className="pl-9 bg-white/5 border-white/10 text-white placeholder:text-slate-600"
                      />
                    </div>
                  </div>
                  <div className="space-y-1.5">
                    <Label className="text-slate-300 text-xs">Nachname *</Label>
                    <div className="relative">
                      <User className="absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 text-slate-500" />
                      <Input
                        value={adminForm.lastName}
                        onChange={(e) => setAdminForm({ ...adminForm, lastName: e.target.value })}
                        placeholder="Nachname"
                        className="pl-9 bg-white/5 border-white/10 text-white placeholder:text-slate-600"
                      />
                    </div>
                  </div>
                </div>

                <div className="space-y-1.5">
                  <Label className="text-slate-300 text-xs">Unternehmen / Partnername *</Label>
                  <div className="relative">
                    <Building className="absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 text-slate-500" />
                    <Input
                      value={adminForm.companyName}
                      onChange={(e) => setAdminForm({ ...adminForm, companyName: e.target.value })}
                      placeholder="Name Ihrer Firma"
                      className="pl-9 bg-white/5 border-white/10 text-white placeholder:text-slate-600"
                    />
                  </div>
                </div>

                <div className="space-y-1.5">
                  <Label className="text-slate-300 text-xs">E-Mail-Adresse *</Label>
                  <div className="relative">
                    <Mail className="absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 text-slate-500" />
                    <Input
                      type="email"
                      value={adminForm.email}
                      onChange={(e) => setAdminForm({ ...adminForm, email: e.target.value })}
                      placeholder="admin@firma.de"
                      className="pl-9 bg-white/5 border-white/10 text-white placeholder:text-slate-600"
                    />
                  </div>
                </div>

                <div className="grid grid-cols-2 gap-4">
                  <div className="space-y-1.5">
                    <Label className="text-slate-300 text-xs">Passwort * (min. 6 Zeichen)</Label>
                    <div className="relative">
                      <Lock className="absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 text-slate-500" />
                      <Input
                        type="password"
                        value={adminForm.password}
                        onChange={(e) => setAdminForm({ ...adminForm, password: e.target.value })}
                        placeholder="••••••"
                        className="pl-9 bg-white/5 border-white/10 text-white placeholder:text-slate-600"
                      />
                    </div>
                  </div>
                  <div className="space-y-1.5">
                    <Label className="text-slate-300 text-xs">Passwort bestätigen *</Label>
                    <div className="relative">
                      <Lock className="absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 text-slate-500" />
                      <Input
                        type="password"
                        value={adminForm.confirmPassword}
                        onChange={(e) => setAdminForm({ ...adminForm, confirmPassword: e.target.value })}
                        placeholder="••••••"
                        className="pl-9 bg-white/5 border-white/10 text-white placeholder:text-slate-600"
                      />
                    </div>
                  </div>
                </div>
              </div>

              <div className="flex gap-3">
                <Button variant="ghost" onClick={() => setStep(1)} className="text-white hover:bg-white/5">
                  Zurück
                </Button>
                <Button
                  onClick={() => setStep(3)}
                  disabled={!isAdminFormValid}
                  className="flex-1 bg-blue-600 hover:bg-blue-500 text-white font-bold"
                >
                  Weiter zu SMTP
                  <ArrowRight className="w-4 h-4 ml-2" />
                </Button>
              </div>
            </motion.div>
          )}

          {step === 3 && (
            <motion.div
              key="step3"
              initial={{ opacity: 0, y: 15 }}
              animate={{ opacity: 1, y: 0 }}
              exit={{ opacity: 0, y: -15 }}
              transition={{ duration: 0.3 }}
              className="glass-dark border border-white/10 rounded-3xl p-8 space-y-6 shadow-2xl"
            >
              <div className="space-y-1">
                <h2 className="text-2xl font-bold flex items-center gap-2">
                  <Mail className="w-6 h-6 text-blue-400" />
                  SMTP-Mailserver konfigurieren
                </h2>
                <p className="text-slate-400 text-sm">
                  Tragen Sie Ihre Mailserver-Daten ein, um automatisierte E-Mails an Partner und Kunden senden zu können.
                </p>
              </div>

              {errorMsg && (
                <div className="p-3 rounded-lg bg-red-500/10 border border-red-500/20 text-red-400 text-xs">
                  {errorMsg}
                </div>
              )}

              <div className="space-y-4">
                <div className="grid grid-cols-3 gap-4">
                  <div className="col-span-2 space-y-1.5">
                    <Label className="text-slate-300 text-xs">SMTP Host *</Label>
                    <Input
                      value={smtpForm.host}
                      onChange={(e) => setSmtpForm({ ...smtpForm, host: e.target.value })}
                      placeholder="smtp.domain.de"
                      className="bg-white/5 border-white/10 text-white placeholder:text-slate-600"
                    />
                  </div>
                  <div className="space-y-1.5">
                    <Label className="text-slate-300 text-xs">SMTP Port *</Label>
                    <Input
                      value={smtpForm.port}
                      onChange={(e) => setSmtpForm({ ...smtpForm, port: e.target.value })}
                      placeholder="587"
                      className="bg-white/5 border-white/10 text-white"
                    />
                  </div>
                </div>

                <div className="space-y-1.5">
                  <Label className="text-slate-300 text-xs">Benutzername *</Label>
                  <Input
                    value={smtpForm.user}
                    onChange={(e) => setSmtpForm({ ...smtpForm, user: e.target.value })}
                    placeholder="mail@domain.de"
                    className="bg-white/5 border-white/10 text-white placeholder:text-slate-600"
                  />
                </div>

                <div className="space-y-1.5">
                  <Label className="text-slate-300 text-xs">Passwort</Label>
                  <Input
                    type="password"
                    value={smtpForm.pass}
                    onChange={(e) => setSmtpForm({ ...smtpForm, pass: e.target.value })}
                    placeholder="••••••••••••"
                    className="bg-white/5 border-white/10 text-white placeholder:text-slate-600"
                  />
                </div>

                <div className="flex items-center gap-2 pt-2">
                  <input
                    type="checkbox"
                    id="smtp_secure"
                    checked={smtpForm.secure}
                    onChange={(e) => setSmtpForm({ ...smtpForm, secure: e.target.checked })}
                    className="w-4 h-4 rounded border-slate-700 bg-white/5 text-blue-500 focus:ring-0 focus:ring-offset-0"
                  />
                  <Label htmlFor="smtp_secure" className="text-slate-300 text-sm cursor-pointer select-none">
                    Sichere Verbindung (SSL/TLS anstelle STARTTLS)
                  </Label>
                </div>
              </div>

              <div className="flex gap-3">
                <Button
                  variant="ghost"
                  onClick={() => setStep(2)}
                  disabled={loading}
                  className="text-white hover:bg-white/5"
                >
                  Zurück
                </Button>
                <Button
                  onClick={handleFinishSetup}
                  disabled={!isSmtpFormValid || loading}
                  className="flex-1 bg-gradient-to-r from-blue-600 to-indigo-600 hover:from-blue-500 hover:to-indigo-500 text-white font-bold"
                >
                  {loading ? (
                    <>
                      <Loader2 className="w-4 h-4 mr-2 animate-spin" /> Setup wird abgeschlossen...
                    </>
                  ) : (
                    'Einrichtung abschließen'
                  )}
                </Button>
              </div>
            </motion.div>
          )}
        </AnimatePresence>
      </div>
    </div>
  )
}