import { useState } from "react";
import { Link, useNavigate, useSearchParams } from "react-router";
import { t } from "@lingui/core/macro";
import { Trans } from "@lingui/react/macro";

import { API_URL, VALIDATION } from "../config/api.ts";
import { useDocumentTitle } from "../hooks/useDocumentTitle.ts";
import { PageShell } from "../components/PageShell.tsx";
import {
  expectOk,
  FormError,
  FormProvider,
  SubmitButton,
  TextField,
  useApiForm,
} from "../components/form/index.ts";

interface Values {
  newPassword: string;
  confirm: string;
}

export function ResetPassword() {
  useDocumentTitle(t`Reset password`);
  const [params] = useSearchParams();
  const navigate = useNavigate();
  const token = params.get("token") ?? "";
  const [done, setDone] = useState(false);

  const form = useApiForm<Values>({
    mode: "onChange",
    defaultValues: { newPassword: "", confirm: "" },
  });

  const onSubmit = form.submit(async ({ newPassword }) => {
    await expectOk(
      await fetch(`${API_URL}/api/users/reset-password`, {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ token, newPassword }),
      }),
    );
    setDone(true);
  });

  if (!token) {
    return (
      <PageShell centered>
        <div className="auth-card">
          <h1 className="auth-card-title">
            <Trans>Invalid link</Trans>
          </h1>
          <p>
            <Trans>This reset link is missing or malformed.</Trans>
          </p>
          <Link
            to="/login"
            className="btn-primary"
            style={{ marginTop: "1rem", display: "inline-block" }}
          >
            <Trans>Back to login</Trans>
          </Link>
        </div>
      </PageShell>
    );
  }

  if (done) {
    return (
      <PageShell centered>
        <div className="auth-card">
          <h1 className="auth-card-title">
            <Trans>Password updated</Trans>
          </h1>
          <p style={{ marginBottom: "1rem" }}>
            <Trans>Your password has been changed. You can now log in.</Trans>
          </p>
          <button
            type="button"
            className="btn-primary"
            onClick={() => navigate("/login")}
          >
            <Trans>Go to login</Trans>
          </button>
        </div>
      </PageShell>
    );
  }

  return (
    <PageShell centered>
      <div className="auth-card">
        <h1 className="auth-card-title">
          <Trans>Set new password</Trans>
        </h1>

        <FormProvider {...form}>
          <form onSubmit={onSubmit} className="form">
            <FormError title={t`Reset failed`} />
            <TextField<Values>
              name="newPassword"
              type="password"
              placeholder={t`New password`}
              autoComplete="new-password"
              autoFocus
              maxLength={VALIDATION.PASSWORD_MAX}
              rules={{
                required: true,
                minLength: {
                  value: VALIDATION.PASSWORD_MIN,
                  message: t`At least ${VALIDATION.PASSWORD_MIN} characters`,
                },
              }}
            />
            <TextField<Values>
              name="confirm"
              type="password"
              placeholder={t`Confirm new password`}
              autoComplete="new-password"
              rules={{
                required: true,
                validate: (value, values) =>
                  value === values.newPassword || t`Passwords do not match`,
              }}
            />
            <SubmitButton pendingLabel={<Trans>Saving…</Trans>}>
              <Trans>Set new password</Trans>
            </SubmitButton>
          </form>
        </FormProvider>

        <p className="auth-card-footer">
          <Link to="/login">
            <Trans>Back to login</Trans>
          </Link>
        </p>
      </div>
    </PageShell>
  );
}