import { useEffect, useState } from 'react';
import Typography from 'antd/es/typography';
import Switch from 'antd/es/switch';
import Button from 'antd/es/button';
import Modal from 'antd/es/modal';
import message from 'antd/es/message';
import Space from 'antd/es/space';
import Divider from 'antd/es/divider';
import { useNavigate } from 'react-router-dom';
import { updateConsent, exportMyData, deleteMyAccount, resendVerificationEmail } from './customerApi';
import { setFavoriteAlerts } from './favoritesApi';
import { useCustomerAuth } from './CustomerAuthContext';
import AccountDetails from './AccountDetails';

const { Text } = Typography;

type Props = Readonly<{
  // Supplied by the route, which decides where closing lands: back to the page
  // the customer came from, or to the storefront when they arrived directly.
  onClose: () => void;
}>;

export default function Account({ onClose }: Props) {
  const { customer, loading, refresh, logout } = useCustomerAuth();
  const navigate = useNavigate();
  const [resending, setResending] = useState(false);

  useEffect(() => {
    if (!loading && !customer) navigate('/login');
  }, [loading, customer, navigate]);

  if (!customer) return null;

  async function handleResendVerification() {
    setResending(true);
    try {
      await resendVerificationEmail();
      message.success('Sent. Check your inbox, and your spam folder.');
    } catch (err) {
      // Shown as it arrives: the rate limit's message says the mail probably
      // did send and where to look, which a generic failure would throw away.
      message.error((err as Error).message);
    } finally {
      setResending(false);
    }
  }

  async function handleFavoriteAlertsToggle(checked: boolean) {
    try {
      await setFavoriteAlerts(checked);
    } catch (err) {
      message.error((err as Error).message);
      return;
    }
    refresh();
    message.success(checked ? 'We will email you when a favorite sells' : 'Turned off');
  }

  async function handleConsentToggle(checked: boolean) {
    await updateConsent(checked);
    message.success(checked ? 'Subscribed to emails' : 'Unsubscribed from emails');
    refresh();
  }

  async function handleLogout() {
    try {
      await logout();
    } catch (err) {
      message.error(`Couldn't log out — ${(err as Error).message}`);
      return;
    }
    // replace, so Back doesn't return to the account page — which would only
    // bounce to /login now that the session is gone.
    navigate('/', { replace: true });
  }

  function handleDelete() {
    Modal.confirm({
      title: 'Delete your account?',
      content: 'This permanently removes your account and personal data. Your past orders are kept for accounting purposes but disconnected from your identity. This cannot be undone.',
      okText: 'Delete my account',
      okButtonProps: { danger: true },
      onOk: async () => {
        await deleteMyAccount();
        // The storefront is rendered behind this modal, so without clearing the
        // session it goes on showing "My Account" and hiding Sign up for an
        // account that no longer exists — visibly stale, not merely stale in
        // state. replace, so Back cannot return to /account and bounce to
        // /login.
        refresh();
        message.success('Account deleted');
        navigate('/', { replace: true });
      }
    });
  }

  return (
    <Modal
      open
      // The account view is a place a customer can be sent by an email link or
      // a bookmark, so it is titled and closable rather than relying on the
      // page behind it to say where they are.
      title="My Account"
      onCancel={onClose}
      footer={null}
      width={700}
      // The view holds profile, two consents, order history, and the account
      // controls, which is taller than a phone. Capping the body and letting it
      // scroll keeps the title and close control in reach instead of pushing
      // them off-screen.
      style={{ maxWidth: 'calc(100vw - 32px)', top: 24 }}
      styles={{ body: { maxHeight: '70vh', overflowY: 'auto' } }}
      destroyOnHidden
    >
      <div>
        <Text>{customer.email}</Text>
        {/* The button only exists while there is something to verify. Offering
            it on a verified account would be a control whose only outcome is a
            refusal. */}
        {!customer.email_verified && (
          <div style={{ marginTop: 8 }}>
            <Text type="warning">Email not verified — check your inbox for a verification link.</Text>
            <div style={{ marginTop: 8 }}>
              <Button size="small" loading={resending} onClick={handleResendVerification}>
                Send it again
              </Button>
            </div>
          </div>
        )}

        <Divider />
        <AccountDetails customer={customer} onChanged={refresh} />

        <Divider />
        <Space align="center">
          <Switch checked={customer.marketing_consent} onChange={handleConsentToggle} />
          <Text>Receive emails about new items</Text>
        </Space>

        {/* A separate consent from marketing above, and shown separately so a
            customer can hold one without the other. */}
        <div style={{ marginTop: 12 }}>
          <Space align="center">
            <Switch checked={customer.favorite_alerts} onChange={handleFavoriteAlertsToggle} />
            <Text>Email me when an item I favorited is sold</Text>
          </Space>
        </div>

        <Divider />
        <Space wrap>
          {/* Order history is a page of its own now. The link stays here because
              this is where a customer looks for it. */}
          <Button onClick={() => navigate('/orders')}>View order history</Button>
          <Button onClick={exportMyData}>Download my data</Button>
          <Button onClick={handleLogout}>Log out</Button>
          <Button danger onClick={handleDelete}>Delete my account</Button>
        </Space>
      </div>
    </Modal>
  );
}