"use client"

import { useState, useEffect, Suspense } from "react"
import { signIn } from "next-auth/react"
import { useRouter, useSearchParams } from "next/navigation"
import Link from "next/link"

function LoginForm() {
  const [email, setEmail] = useState("")
  const [password, setPassword] = useState("")
  const [error, setError] = useState("")
  const [loading, setLoading] = useState(false)
  const router = useRouter()
  const searchParams = useSearchParams()
  const isDemo = searchParams.get("demo") === "1"

  const doLogin = async (e?: React.FormEvent, demoEmail?: string, demoPass?: string) => {
    if (e) e.preventDefault()
    setError("")
    setLoading(true)

    const result = await signIn("credentials", {
      email: demoEmail || email,
      password: demoPass || password,
      redirect: false,
    })

    if (result?.error) {
      setError("Invalid email or password")
      setLoading(false)
    } else {
      router.push("/dashboard")
    }
  }

  // Auto-login as demo if ?demo=1
  // eslint-disable-next-line react-hooks/exhaustive-deps
  useEffect(() => { if (isDemo) doLogin(undefined, "demo@pnpl.app", "demo1234") }, [])

  return (
    <div className="min-h-screen flex items-center justify-center bg-gradient-to-br from-trust-blue/5 via-white to-warm-amber/5 p-4">
      <div className="w-full max-w-sm space-y-5">
        {isDemo && (
          <div className="text-center py-8">
            <div className="inline-flex h-12 w-12 rounded-2xl bg-gradient-to-br from-trust-blue to-blue-600 items-center justify-center shadow-lg shadow-trust-blue/20 animate-pulse mb-3">
              <span className="text-white text-xl">🤲</span>
            </div>
            <p className="text-sm font-medium text-trust-blue animate-pulse">Loading demo...</p>
          </div>
        )}

        {!isDemo && (
          <>
            <div className="text-center">
              <div className="inline-flex h-12 w-12 rounded-2xl bg-gradient-to-br from-trust-blue to-blue-600 items-center justify-center shadow-lg shadow-trust-blue/20 mb-3">
                <span className="text-white text-xl">🤲</span>
              </div>
              <h1 className="text-2xl font-black text-gray-900">Welcome back</h1>
              <p className="text-sm text-muted-foreground mt-1">Sign in to your charity dashboard</p>
            </div>

            {/* Social login */}
            <div className="space-y-2">
              <button
                onClick={() => signIn("auth0", { callbackUrl: "/dashboard" })}
                className="w-full flex items-center justify-center gap-2 rounded-xl border border-gray-200 bg-white px-4 py-3 text-sm font-medium text-gray-700 hover:bg-gray-50 transition-all"
              >
                <svg className="h-4 w-4" viewBox="0 0 24 24"><path d="M22.56 12.25c0-.78-.07-1.53-.2-2.25H12v4.26h5.92a5.06 5.06 0 01-2.2 3.32v2.77h3.57c2.08-1.92 3.28-4.74 3.28-8.1z" fill="#4285F4"/><path d="M12 23c2.97 0 5.46-.98 7.28-2.66l-3.57-2.77c-.98.66-2.23 1.06-3.71 1.06-2.86 0-5.29-1.93-6.16-4.53H2.18v2.84C3.99 20.53 7.7 23 12 23z" fill="#34A853"/><path d="M5.84 14.09c-.22-.66-.35-1.36-.35-2.09s.13-1.43.35-2.09V7.07H2.18C1.43 8.55 1 10.22 1 12s.43 3.45 1.18 4.93l2.85-2.22.81-.62z" fill="#FBBC05"/><path d="M12 5.38c1.62 0 3.06.56 4.21 1.64l3.15-3.15C17.45 2.09 14.97 1 12 1 7.7 1 3.99 3.47 2.18 7.07l3.66 2.84c.87-2.6 3.3-4.53 6.16-4.53z" fill="#EA4335"/></svg>
                Continue with Google
              </button>
            </div>

            <div className="relative">
              <div className="absolute inset-0 flex items-center"><div className="w-full border-t" /></div>
              <div className="relative flex justify-center text-xs"><span className="bg-gradient-to-br from-trust-blue/5 via-white to-warm-amber/5 px-3 text-muted-foreground">or sign in with email</span></div>
            </div>

            {/* Email/password form */}
            <form onSubmit={(e) => doLogin(e)} className="space-y-3">
              {error && (
                <div className="rounded-xl bg-danger-red/10 border border-danger-red/20 p-2.5 text-sm text-danger-red text-center">{error}</div>
              )}
              <input
                type="email"
                value={email}
                onChange={(e) => setEmail(e.target.value)}
                className="w-full rounded-xl border border-gray-200 px-4 py-3 text-sm focus:border-trust-blue focus:ring-2 focus:ring-trust-blue/20 outline-none transition-all"
                placeholder="Email"
                required
              />
              <input
                type="password"
                value={password}
                onChange={(e) => setPassword(e.target.value)}
                className="w-full rounded-xl border border-gray-200 px-4 py-3 text-sm focus:border-trust-blue focus:ring-2 focus:ring-trust-blue/20 outline-none transition-all"
                placeholder="Password"
                required
              />
              <button
                type="submit"
                disabled={loading}
                className="w-full rounded-xl bg-trust-blue px-4 py-3 text-sm font-semibold text-white hover:bg-trust-blue/90 disabled:opacity-50 transition-all"
              >
                {loading ? "Signing in..." : "Sign In"}
              </button>
            </form>

            <div className="relative">
              <div className="absolute inset-0 flex items-center"><div className="w-full border-t" /></div>
              <div className="relative flex justify-center text-xs"><span className="bg-gradient-to-br from-trust-blue/5 via-white to-warm-amber/5 px-2 text-muted-foreground">or</span></div>
            </div>

            <button
              type="button"
              onClick={() => doLogin(undefined, "demo@pnpl.app", "demo1234")}
              disabled={loading}
              className="w-full rounded-xl border-2 border-dashed border-gray-200 px-4 py-3 text-sm font-medium text-muted-foreground hover:border-trust-blue hover:text-trust-blue disabled:opacity-50 transition-all"
            >
              🎮 Try the Demo — no signup needed
            </button>

            <p className="text-center text-sm text-muted-foreground">
              Don&apos;t have an account?{" "}
              <Link href="/signup" className="text-trust-blue font-semibold hover:underline">Get Started Free</Link>
            </p>
          </>
        )}
      </div>
    </div>
  )
}

export default function LoginPage() {
  return (
    <Suspense fallback={<div className="min-h-screen flex items-center justify-center"><div className="animate-spin h-8 w-8 border-2 border-trust-blue border-t-transparent rounded-full" /></div>}>
      <LoginForm />
    </Suspense>
  )
}
