'use client'

import { useState } from 'react'
import { useRouter } from 'next/navigation'
import Link from 'next/link'
import { loginUser } from '@/app/actions'
import { Button } from '@/components/ui/button'
import { Input } from '@/components/ui/input'
import { LogIn, KeyRound, User, Loader2, Eye, EyeOff } from 'lucide-react'

export default function LoginPage() {
  const router = useRouter()
  const [loading, setLoading] = useState(false)
  const [error, setError] = useState('')
  const [showPassword, setShowPassword] = useState(false)

  async function handleSubmit(e: React.FormEvent<HTMLFormElement>) {
    e.preventDefault()
    setLoading(true)
    setError('')

    const formData = new FormData(e.currentTarget)
    const username = (formData.get('username') as string).trim()
    const password = formData.get('password') as string

    if (!username || !password) {
      setError('Username dan Password wajib diisi')
      setLoading(false)
      return
    }

    const res = await loginUser(username, password)
    if (res.success) {
      const params = new URLSearchParams(window.location.search)
      const callbackUrl = params.get('callbackUrl') || '/'
      window.location.href = callbackUrl // Force hard reload to update context/middleware
    } else {
      setError(res.error || 'Gagal login')
      setLoading(false)
    }
  }

  return (
    <div className="min-h-screen flex items-center justify-center bg-slate-50 dark:bg-slate-950 p-4 lg:p-6 relative overflow-hidden">
      {/* Elegant Ambient Background */}
      <div className="absolute inset-0 z-0 pointer-events-none">
        <div className="absolute inset-0 bg-[linear-gradient(to_right,#80808012_1px,transparent_1px),linear-gradient(to_bottom,#80808012_1px,transparent_1px)] bg-[size:24px_24px] [mask-image:radial-gradient(ellipse_60%_50%_at_50%_0%,#000_70%,transparent_100%)]"></div>
        <div className="absolute left-1/2 top-1/2 -translate-x-1/2 -translate-y-1/2 h-[400px] w-[600px] rounded-full bg-[#1B2CC1] opacity-10 dark:opacity-20 blur-[120px]"></div>
      </div>

      <div className="w-full max-w-5xl bg-white dark:bg-slate-900 lg:rounded-[2.5rem] rounded-3xl shadow-2xl shadow-[#1B2CC1]/10 flex overflow-hidden border border-slate-100 dark:border-slate-800 relative z-10">
        
        {/* Left Side: Branding (Hidden on Mobile) */}
        <div className="hidden lg:flex w-1/2 bg-gradient-to-br from-[#1B2CC1] to-[#121E85] p-12 flex-col justify-between relative overflow-hidden">
          <div className="absolute top-0 left-0 w-full h-full pointer-events-none">
            <div className="absolute -top-[20%] -left-[10%] w-[60%] h-[60%] rounded-full bg-white/10 blur-3xl" />
            <div className="absolute top-[60%] -right-[10%] w-[70%] h-[70%] rounded-full bg-blue-400/20 blur-3xl" />
          </div>

          <div className="relative z-10">
            <div className="inline-flex items-center justify-center p-3 bg-white/10 rounded-2xl backdrop-blur-md border border-white/20 mb-8 shadow-sm">
              <LogIn className="w-8 h-8 text-white" />
            </div>
            <h1 className="text-4xl font-black text-white leading-tight">
              Selamat Datang <br /> di TitipIn
            </h1>
            <p className="text-blue-100 mt-4 text-base max-w-sm leading-relaxed">
              Platform modern dan terpercaya untuk mengelola pesanan jasa titip Anda dengan rapi, efisien, dan transparan.
            </p>
          </div>

          <div className="relative z-10 flex items-center gap-4 bg-white/10 p-4 rounded-2xl backdrop-blur-sm border border-white/10 w-fit">
            <div className="flex -space-x-3">
              <div className="w-10 h-10 rounded-full bg-blue-200 border-2 border-[#121E85] flex items-center justify-center text-[10px] font-bold text-blue-700">A</div>
              <div className="w-10 h-10 rounded-full bg-purple-200 border-2 border-[#121E85] flex items-center justify-center text-[10px] font-bold text-purple-700">B</div>
              <div className="w-10 h-10 rounded-full bg-amber-200 border-2 border-[#121E85] flex items-center justify-center text-[10px] font-bold text-amber-700">C</div>
            </div>
            <p className="text-xs text-blue-100 font-medium">Bergabung dengan ribuan<br/>pengguna lainnya.</p>
          </div>
        </div>

        {/* Right Side: Form */}
        <div className="w-full lg:w-1/2 p-8 lg:p-14 flex flex-col justify-center">
          <div className="lg:hidden flex flex-col items-center mb-8">
            <div className="w-16 h-16 rounded-2xl bg-gradient-to-br from-[#1B2CC1] to-[#121E85] flex items-center justify-center text-white shadow-lg shadow-[#1B2CC1]/25 mb-4">
              <LogIn className="w-8 h-8" />
            </div>
            <h1 className="text-2xl font-black text-slate-900 dark:text-white">TitipIn</h1>
          </div>

          <div className="mb-8 text-center lg:text-left">
            <h2 className="text-2xl font-black text-slate-900 dark:text-white hidden lg:block mb-2">Masuk ke Akun</h2>
            <p className="text-sm text-slate-500">Silakan masukkan kredensial Anda untuk melanjutkan</p>
          </div>

          {error && (
            <div className="bg-rose-50 text-rose-600 p-3 rounded-xl text-sm font-medium mb-6 border border-rose-100 text-center">
              {error}
            </div>
          )}

          <form onSubmit={handleSubmit} className="space-y-5">
            <div className="space-y-2">
              <label className="text-xs font-bold text-slate-700 dark:text-slate-300 uppercase tracking-wider">Username</label>
              <div className="relative">
                <User className="absolute left-3.5 top-1/2 -translate-y-1/2 w-4 h-4 text-slate-400" />
                <Input 
                  name="username"
                  className="pl-10 h-12 bg-slate-50 dark:bg-slate-800/50 rounded-xl border-slate-200 focus-visible:ring-[#1B2CC1]"
                  placeholder="Masukkan username"
                />
              </div>
            </div>

            <div className="space-y-2">
              <label className="text-xs font-bold text-slate-700 dark:text-slate-300 uppercase tracking-wider">Password</label>
              <div className="relative flex items-center">
                <KeyRound className="absolute left-3.5 w-4 h-4 text-slate-400" />
                <Input 
                  name="password"
                  type={showPassword ? 'text' : 'password'}
                  className="pl-10 pr-12 h-12 bg-slate-50 dark:bg-slate-800/50 rounded-xl border-slate-200 focus-visible:ring-[#1B2CC1]"
                  placeholder="Masukkan password"
                />
                <button 
                  type="button"
                  onClick={() => setShowPassword(!showPassword)}
                  className="absolute right-3.5 text-slate-400 hover:text-slate-600 dark:hover:text-slate-200 transition-colors cursor-pointer"
                  aria-label={showPassword ? 'Sembunyikan password' : 'Tampilkan password'}
                >
                  {showPassword ? <EyeOff className="w-5 h-5" /> : <Eye className="w-5 h-5" />}
                </button>
              </div>
            </div>

            <Button 
              type="submit" 
              disabled={loading}
              className="w-full h-12 rounded-xl bg-[#1B2CC1] hover:bg-[#15229E] text-white font-bold text-base shadow-md shadow-[#1B2CC1]/20 transition-all active:scale-[0.98] mt-2 cursor-pointer"
            >
              {loading ? <Loader2 className="w-5 h-5 animate-spin" /> : 'Masuk Sekarang'}
            </Button>
          </form>

          <p className="text-center text-sm text-slate-500 mt-8">
            Belum punya akun?{' '}
            <button 
              onClick={() => {
                const search = window.location.search
                router.push(`/register${search}`)
              }}
              className="font-bold text-[#1B2CC1] hover:underline cursor-pointer"
            >
              Daftar di sini
            </button>
          </p>

          <p className="text-center text-xs text-slate-400 mt-12 font-medium">
            &copy; {new Date().getFullYear()} TitipIn - Sistem Titip Pesanan
          </p>
        </div>
      </div>
    </div>
  )
}