"use client";

import Link from "next/link";
import { useRouter } from "next/navigation";
import { useState, FormEvent } from "react";
import { PageSchema } from "../../components/page-schema";
import { SiteFooter } from "../../components/site-footer";
import { SiteHeader } from "../../components/site-header";
import { defaultFaqs } from "../../data/faq";
import { siteInfo } from "../../data/site";
import { storeAuthTokens } from "@/lib/api";

type ApiResponse<T> = {
  data: T;
  meta: { timestamp: string; version: "v1" };
  error: null | { message: string; code?: string };
};

type AuthData = {
  user: { id: string; email: string; fullName?: string };
  accessToken: string;
  refreshToken: string;
  message?: string;
};

export default function RegisterPage() {
  const router = useRouter();
  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");
  const [status, setStatus] = useState<string>("");
  const [isError, setIsError] = useState(false);

  const schema = [
    {
      "@context": "https://schema.org",
      "@type": "WebPage",
      name: "LedgerOne Create Account",
      description: "Create a LedgerOne account and start with two free accounts.",
      url: `${siteInfo.url}/register`,
    },
    {
      "@context": "https://schema.org",
      "@type": "FAQPage",
      mainEntity: defaultFaqs.map((item) => ({
        "@type": "Question",
        name: item.question,
        acceptedAnswer: { "@type": "Answer", text: item.answer },
      })),
    },
  ];

  const onSubmit = async (event: FormEvent) => {
    event.preventDefault();
    setStatus("Creating account...");
    setIsError(false);
    try {
      const res = await fetch("/api/auth/register", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ email, password }),
      });
      const payload = (await res.json()) as ApiResponse<AuthData>;
      if (!res.ok || payload.error) {
        setStatus(payload.error?.message ?? "Registration failed.");
        setIsError(true);
        return;
      }
      storeAuthTokens({
        accessToken: payload.data.accessToken,
        refreshToken: payload.data.refreshToken,
        user: payload.data.user,
      });
      setStatus("Account created! Please verify your email.");
      router.push("/app");
    } catch {
      setStatus("Registration failed. Please try again.");
      setIsError(true);
    }
  };

  return (
    <div className="min-h-screen bg-background font-sans text-foreground">
      <SiteHeader />
      <div className="flex min-h-full flex-col justify-center py-12 sm:px-6 lg:px-8 mt-16 relative">
        <div className="absolute inset-0 mesh-gradient -z-10 opacity-30" />
        <div className="sm:mx-auto sm:w-full sm:max-w-md">
          <div className="flex justify-center">
            <div className="h-12 w-12 rounded-xl bg-primary flex items-center justify-center text-primary-foreground font-bold text-xl shadow-glow-teal">
              L1
            </div>
          </div>
          <h2 className="mt-6 text-center text-3xl font-bold tracking-tight text-foreground">
            Create your account
          </h2>
          <p className="mt-2 text-center text-sm text-muted-foreground">
            Already have an account?{" "}
            <Link href="/login" className="font-medium text-primary hover:text-primary/80 transition-colors">
              Sign in
            </Link>
          </p>
        </div>
        <div className="mt-8 sm:mx-auto sm:w-full sm:max-w-md">
          <div className="glass-panel py-8 px-4 shadow-xl sm:rounded-xl sm:px-10">
            <form className="space-y-6" onSubmit={onSubmit}>
              <div>
                <label htmlFor="email" className="block text-sm font-medium text-foreground">
                  Email address
                </label>
                <div className="mt-1">
                  <input
                    id="email" name="email" type="email" autoComplete="email" required
                    value={email} onChange={(e) => setEmail(e.target.value)}
                    className="block w-full appearance-none rounded-lg border border-border bg-background/50 px-3 py-2 placeholder-muted-foreground shadow-sm focus:border-primary focus:outline-none focus:ring-primary sm:text-sm transition-all"
                  />
                </div>
              </div>
              <div>
                <label htmlFor="password" className="block text-sm font-medium text-foreground">
                  Password
                </label>
                <div className="mt-1">
                  <input
                    id="password" name="password" type="password" autoComplete="new-password" required
                    minLength={8}
                    value={password} onChange={(e) => setPassword(e.target.value)}
                    className="block w-full appearance-none rounded-lg border border-border bg-background/50 px-3 py-2 placeholder-muted-foreground shadow-sm focus:border-primary focus:outline-none focus:ring-primary sm:text-sm transition-all"
                  />
                </div>
                <p className="mt-1 text-xs text-muted-foreground">Minimum 8 characters</p>
              </div>
              <div>
                <div className="flex items-center gap-2 mb-6">
                  <input
                    id="terms" name="terms" type="checkbox" required
                    className="h-4 w-4 rounded border-border bg-background/50 text-primary focus:ring-primary"
                    onChange={(e) => {
                      const btn = document.getElementById("submit-btn") as HTMLButtonElement;
                      if (btn) btn.disabled = !e.target.checked;
                    }}
                  />
                  <label htmlFor="terms" className="text-sm text-muted-foreground">
                    I agree to the{" "}
                    <Link href="/terms" className="text-primary hover:underline">Terms of Service</Link>{" "}
                    and{" "}
                    <Link href="/privacy-policy" className="text-primary hover:underline">Privacy Policy</Link>
                  </label>
                </div>
                <button
                  id="submit-btn" type="submit" disabled
                  className="flex w-full justify-center rounded-lg border border-transparent bg-primary py-2.5 px-4 text-sm font-bold text-primary-foreground shadow-sm hover:bg-primary/90 focus:outline-none focus:ring-2 focus:ring-primary focus:ring-offset-2 transition-all hover:-translate-y-0.5 disabled:opacity-50 disabled:cursor-not-allowed disabled:hover:translate-y-0"
                >
                  Create account
                </button>
              </div>
            </form>
            {status && (
              <div className={`mt-4 rounded-lg p-4 ${isError ? "bg-red-500/10 border border-red-500/20" : "bg-accent/10 border border-accent/20"}`}>
                <p className="text-sm font-medium text-center">{status}</p>
              </div>
            )}
          </div>
        </div>
      </div>
      <SiteFooter />
      <PageSchema schema={schema} />
    </div>
  );
}