import { useState } from "react";
import { useLocation, useSearch, Link } from "wouter";
import { useLocalLogin } from "@workspace/api-client-react";
import { useQueryClient } from "@tanstack/react-query";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import { PasswordInput } from "@/components/password-input";
import { loadCsrfToken } from "@/lib/csrf";
import { Card, CardContent, CardHeader, CardTitle, CardDescription } from "@/components/ui/card";
import { ThemeToggle } from "@/components/theme-toggle";
import { Wrench, AlertCircle } from "lucide-react";
import { useTranslation } from "react-i18next";

export default function Login() {
  const { t } = useTranslation();
  const [, setLocation] = useLocation();
  const search = useSearch();
  const params = new URLSearchParams(search);
  const returnTo = params.get("returnTo") || "/";

  const [username, setUsername] = useState("");
  const [password, setPassword] = useState("");
  const [error, setError] = useState<string | null>(null);

  const queryClient = useQueryClient();
  const localLogin = useLocalLogin();

  const handleSubmit = (e: React.FormEvent) => {
    e.preventDefault();
    setError(null);
    localLogin.mutate(
      { data: { username, password } },
      {
        onSuccess: () => {
          queryClient.invalidateQueries();
          void loadCsrfToken();
          setLocation(returnTo);
        },
        onError: (err) => {
          setError(err.data?.error || err.message || t("auth.invalidCredentials"));
        },
      },
    );
  };

  return (
    <div className="min-h-screen bg-background flex items-center justify-center p-4">
      <div className="absolute top-4 right-4">
        <ThemeToggle />
      </div>
      <div className="w-full max-w-sm space-y-6">
        <div className="flex flex-col items-center gap-2 text-center">
          <Link href="/" className="flex items-center gap-2 text-primary font-bold text-2xl">
            <Wrench className="w-7 h-7" />
            <span>toolr</span>
          </Link>
          <p className="text-muted-foreground text-sm">{t("auth.loginSubtitle")}</p>
        </div>

        <Card>
          <CardHeader className="pb-4">
            <CardTitle className="text-lg">{t("auth.signIn")}</CardTitle>
            <CardDescription>{t("auth.loginDescription")}</CardDescription>
          </CardHeader>
          <CardContent>
            <form onSubmit={handleSubmit} className="space-y-4">
              <div className="space-y-2">
                <Label htmlFor="username">{t("auth.username")}</Label>
                <Input
                  id="username"
                  type="text"
                  value={username}
                  onChange={(e) => setUsername(e.target.value)}
                  placeholder="admin"
                  autoFocus
                  required
                />
              </div>
              <div className="space-y-2">
                <Label htmlFor="password">{t("auth.password")}</Label>
                <PasswordInput
                  id="password"
                  value={password}
                  onChange={(e) => setPassword(e.target.value)}
                  required
                />
              </div>

              {error && (
                <div className="flex items-center gap-2 text-destructive text-sm rounded-md bg-destructive/10 px-3 py-2">
                  <AlertCircle className="w-4 h-4 shrink-0" />
                  {error}
                </div>
              )}

              <Button
                type="submit"
                className="w-full"
                disabled={localLogin.isPending}
              >
                {localLogin.isPending ? t("common.loading") : t("auth.signIn")}
              </Button>
            </form>
          </CardContent>
        </Card>

        <div className="text-center">
          <Link href="/" className="text-sm text-muted-foreground hover:text-primary transition-colors">
            {t("notFound.backHome")}
          </Link>
        </div>
      </div>
    </div>
  );
}