"use client";

import { Suspense, useState } from "react";
import { useSearchParams, useRouter } from "next/navigation";
import { AuthCard, AuthFooterLink } from "@/components/auth/auth-card";
import { auth, AuthError } from "@/lib/auth";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";

function ResetPasswordForm() {
  const params = useSearchParams();
  const router = useRouter();
  const token = params.get("token") ?? "";

  const [password, setPassword] = useState("");
  const [confirm, setConfirm] = useState("");
  const [error, setError] = useState<string | null>(null);
  const [submitting, setSubmitting] = useState(false);
  const [done, setDone] = useState(false);

  if (!token) {
    return (
      <AuthCard title="Invalid reset link" description="The link is missing a token. Please request a new one.">
        <AuthFooterLink prefix="Need a new link?" href="/forgot-password" label="Request one" />
      </AuthCard>
    );
  }

  async function onSubmit(e: React.SyntheticEvent) {
    e.preventDefault();
    setError(null);
    if (password !== confirm) {
      setError("Passwords do not match.");
      return;
    }
    setSubmitting(true);
    try {
      await auth.resetPassword(token, password);
      setDone(true);
      setTimeout(() => router.push("/login"), 1500);
    } catch (err) {
      setError(err instanceof AuthError ? err.message : "Reset failed.");
    } finally {
      setSubmitting(false);
    }
  }

  if (done) {
    return (
      <AuthCard
        title="Password updated"
        description="Redirecting you to the login page…"
      >
        <AuthFooterLink prefix="Take me there now —" href="/login" label="Log in" />
      </AuthCard>
    );
  }

  return (
    <AuthCard
      title="Set a new password"
      description="Choose a strong password you haven't used before."
    >
      <form onSubmit={onSubmit} className="space-y-6">
        <div className="space-y-1.5">
          <Label htmlFor="password">New password</Label>
          <Input
            id="password"
            type="password"
            autoComplete="new-password"
            minLength={8}
            required
            value={password}
            onChange={(e) => setPassword(e.target.value)}
          />
        </div>

        <div className="space-y-1.5">
          <Label htmlFor="confirm">Confirm password</Label>
          <Input
            id="confirm"
            type="password"
            autoComplete="new-password"
            minLength={8}
            required
            value={confirm}
            onChange={(e) => setConfirm(e.target.value)}
          />
        </div>
        <br />
        {error ? <p className="text-sm text-destructive">{error}</p> : null}
        <Button type="submit" disabled={submitting} className="w-full h-11 text-base">
          {submitting ? "Updating…" : "Update password"}
        </Button>
      </form>
    </AuthCard>
  );
}

export default function ResetPasswordPage() {
  // useSearchParams must be inside Suspense for Next.js streaming.
  return (
    <Suspense fallback={null}>
      <ResetPasswordForm />
    </Suspense>
  );
}