'use client'

import { useState } from 'react'
import { signIn } from 'next-auth/react'
import { Button } from '@/components/ui/button'
import { Input } from '@/components/ui/input'
import { Link2, Mail, Lock, User } from 'lucide-react'
import Link from 'next/link'
import { toast } from 'sonner'
import { useRouter } from 'next/navigation'

export function SignupClient() {
  const [name, setName] = useState('')
  const [email, setEmail] = useState('')
  const [password, setPassword] = useState('')
  const [loading, setLoading] = useState(false)
  const router = useRouter()

  const handleSignup = async (e: React.FormEvent) => {
    e.preventDefault()
    // Review M-8: match the server's 8-character minimum (and the input's
    // minLength). The old 6-character check let a doomed request through.
    if (password.length < 8) { toast.error('Password must be at least 8 characters'); return }
    setLoading(true)
    try {
      const res = await fetch('/api/signup', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ email, password, name }),
      })
      const data = await res.json()
      if (res.ok) {
        // Auto sign in
        const result = await signIn('credentials', { email, password, redirect: false })
        if (result?.ok) {
          router.push('/pages')
        } else {
          toast.success('Account created! Please sign in.')
          router.push('/login')
        }
      } else {
        toast.error(data?.error ?? 'Signup failed')
      }
    } catch {
      toast.error('Error creating account')
    }
    setLoading(false)
  }

  return (
    <div className="min-h-screen flex items-center justify-center bg-background p-4">
      <div className="w-full max-w-sm space-y-8">
        <div className="text-center">
          <div className="flex justify-center mb-4">
            <div className="flex h-14 w-14 items-center justify-center rounded-2xl bg-primary text-primary-foreground">
              <Link2 className="h-7 w-7" />
            </div>
          </div>
          <h1 className="font-display text-3xl font-bold tracking-tight">Create Account</h1>
          <p className="text-sm text-muted-foreground mt-2">Join computer to start organizing your links</p>
        </div>

        <form onSubmit={handleSignup} className="space-y-3">
          <div className="relative">
            <User className="absolute left-3 top-1/2 -translate-y-1/2 h-4 w-4 text-muted-foreground" />
            <Input placeholder="Name" value={name} onChange={(e: React.ChangeEvent<HTMLInputElement>) => setName(e.target.value)} className="pl-10" />
          </div>
          <div className="relative">
            <Mail className="absolute left-3 top-1/2 -translate-y-1/2 h-4 w-4 text-muted-foreground" />
            <Input type="email" placeholder="Email" value={email} onChange={(e: React.ChangeEvent<HTMLInputElement>) => setEmail(e.target.value)} className="pl-10" required />
          </div>
          <div className="relative">
            <Lock className="absolute left-3 top-1/2 -translate-y-1/2 h-4 w-4 text-muted-foreground" />
            <Input type="password" placeholder="Password (min 8 chars)" value={password} onChange={(e: React.ChangeEvent<HTMLInputElement>) => setPassword(e.target.value)} className="pl-10" minLength={8} required />
          </div>
          <Button type="submit" className="w-full" loading={loading}>Create Account</Button>
        </form>

        <p className="text-center text-xs text-muted-foreground">
          Already have an account? <Link href="/login" className="text-primary hover:underline">Sign in</Link>
        </p>
      </div>
    </div>
  )
}