provenance/frontend/app/login/page.tsx

"use client";

import Link from "next/link";
import { useRouter } from "next/navigation";
import { useState } from "react";

import { api } from "@/lib/api/client";
import { Button } from "@/components/ui/button";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";

export default function LoginPage() {
  const router = useRouter();
  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");
  const [error, setError] = useState<string | null>(null);
  const [loading, setLoading] = useState(false);

  async function onSubmit(e: React.FormEvent) {
    e.preventDefault();
    setLoading(true);
    setError(null);
    const { error } = await api.POST("/api/v1/auth/login", { body: { email, password } });
    setLoading(false);
    if (error) {
      setError("Invalid email or password.");
      return;
    }
    router.push("/trees");
  }

  return (
    <Card className="mx-auto max-w-md">
      <CardHeader>
        <CardTitle>Sign in</CardTitle>
      </CardHeader>
      <CardContent>
        <form onSubmit={onSubmit} className="space-y-4">
          <div className="space-y-1">
            <Label htmlFor="email">Email</Label>
            <Input
              id="email"
              type="email"
              value={email}
              onChange={(e) => setEmail(e.target.value)}
              required
            />
          </div>
          <div className="space-y-1">
            <Label htmlFor="password">Password</Label>
            <Input
              id="password"
              type="password"
              value={password}
              onChange={(e) => setPassword(e.target.value)}
              required
            />
          </div>
          {error && <p className="text-sm text-red-600">{error}</p>}
          <Button type="submit" disabled={loading} className="w-full">
            {loading ? "Signing in…" : "Sign in"}
          </Button>
        </form>
        <p className="mt-4 text-sm text-neutral-600">
          No account?{" "}
          <Link href="/register" className="underline">
            Create one
          </Link>
        </p>
      </CardContent>
    </Card>
  );
}