"use client";

import Link from "next/link";
import { useState } from "react";
import { useRouter } from "next/navigation";
import { useLanguage } from "@/app/context/LanguageContext";

export default function LoginPageClient() {
  const { lang } = useLanguage();
  const router = useRouter();
  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");
  const [error, setError] = useState("");
  const [loading, setLoading] = useState(false);

  const backLabel = lang === "vi" ? "Quay Về Trang Chủ" : "Back to Home";
  const titleLabel = lang === "vi" ? "Đăng Nhập Quản Trị" : "Admin Login";
  const emailLabel = lang === "vi" ? "Email" : "Email Address";
  const passwordLabel = lang === "vi" ? "Mật Khẩu" : "Password";
  const buttonLabel = lang === "vi" ? "Đăng Nhập" : "Log In";
  const loadingLabel = lang === "vi" ? "Đang xử lý..." : "Processing...";

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    setLoading(true);
    setError("");

    try {
      const res = await fetch("/ipv6/api/auth/login", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ email, password }),
      });

      if (res.ok) {
        router.push("/admin");
      } else {
        const data = await res.json();
        setError(data.error || (lang === "vi" ? "Đăng nhập thất bại" : "Login failed"));
      }
    } catch (err) {
      setError(lang === "vi" ? "Đã xảy ra lỗi" : "An error occurred");
    } finally {
      setLoading(false);
    }
  };

  return (
    <main className="pt-[120px] pb-[80px] px-[var(--spacing-gutter)] flex justify-center min-h-screen">
      <div className="w-full max-w-[1280px]">
        <div className="max-w-[500px] mx-auto">
          <div className="mb-[32px]">
            <Link
              className="group flex items-center gap-2 text-outline hover:text-primary transition-colors"
              href="/"
            >
              <span className="material-symbols-outlined text-[20px] transition-transform group-hover:-translate-x-1">
                arrow_back
              </span>
              {backLabel}
            </Link>
          </div>

          <div className="mb-[32px]">
            <h1 className="font-[var(--font-display-lg)] text-[clamp(1.75rem,3vw+1rem,3.25rem)] text-on-surface mb-2 leading-[1.1]">
              {titleLabel}
            </h1>
          </div>

          <div className="glass-panel p-[32px] md:p-12 rounded-xl shadow-2xl relative overflow-hidden">
            <div className="absolute top-0 left-0 w-full h-[1px] bg-gradient-to-r from-transparent via-primary/20 to-transparent" />
            
            <form onSubmit={handleSubmit} className="space-y-6">
              {error && (
                <div className="bg-error/10 border border-error/20 text-error px-4 py-3 rounded-lg text-sm">
                  {error}
                </div>
              )}

              <div className="space-y-1">
                <label className="text-outline uppercase tracking-wider text-xs">{emailLabel}</label>
                <input
                  type="email"
                  required
                  className="w-full bg-surface-container-low border border-white/10 rounded-lg px-4 py-3 text-on-surface placeholder:text-outline/40 transition-all focus:border-primary/50 outline-none"
                  placeholder=""
                  value={email}
                  onChange={(e) => setEmail(e.target.value)}
                />
              </div>

              <div className="space-y-1">
                <label className="text-outline uppercase tracking-wider text-xs">{passwordLabel}</label>
                <input
                  type="password"
                  required
                  className="w-full bg-surface-container-low border border-white/10 rounded-lg px-4 py-3 text-on-surface placeholder:text-outline/40 transition-all focus:border-primary/50 outline-none"
                  placeholder=""
                  value={password}
                  onChange={(e) => setPassword(e.target.value)}
                />
              </div>

              <div className="pt-4">
                <button
                  type="submit"
                  disabled={loading}
                  className="gold-gradient-bg text-on-primary w-full px-6 py-4 rounded-xl font-[var(--font-display-lg)] text-lg uppercase tracking-wider hover:shadow-[0_0_30px_rgba(197,160,89,0.4)] transition-all duration-300 active:scale-[0.98] disabled:opacity-60"
                >
                  {loading ? loadingLabel : buttonLabel}
                </button>
              </div>
            </form>
          </div>
        </div>
      </div>
    </main>
  );
}