/*
 * Copyright (c) 2026 by Christian Kellner.
 * Licensed under Apache-2.0 with Commons Clause and Attribution/Naming Clause
 */

import React, { useEffect, useState, useMemo } from 'react';
import { Divider, Button, AutoComplete, Toast, Typography, Banner } from '@douyinfe/semi-ui-19';
import { IconSave, IconHome } from '@douyinfe/semi-icons';
import { xhrGet, xhrPost } from '../../services/xhr';
import { SegmentPart } from '../../components/segment/SegmentPart';
import debounce from 'lodash/debounce';

const { Title } = Typography;

const UserSettings = () => {
  const [address, setAddress] = useState('');
  const [coords, setCoords] = useState(null);
  const [loading, setLoading] = useState(true);
  const [saving, setSaving] = useState(false);
  const [dataSource, setDataSource] = useState([]);

  useEffect(() => {
    fetchUserSettings();
  }, []);

  const fetchUserSettings = async () => {
    try {
      const response = await xhrGet('/api/user/settings');
      if (response.status === 200) {
        const homeAddress = response.json.home_address;
        setAddress(homeAddress?.address || '');
        setCoords(homeAddress?.coords || null);
      }
    } catch {
      Toast.error('Failed to fetch user settings');
    } finally {
      setLoading(false);
    }
  };

  const handleSave = async () => {
    setSaving(true);
    try {
      const response = await xhrPost('/api/user/settings', { home_address: address });
      if (response.status === 200) {
        setCoords(response.json.coords);
        Toast.success('Settings saved successfully');
      } else {
        Toast.error(response.json.error || 'Failed to save settings');
      }
    } catch (error) {
      Toast.error(error.json?.error || 'Error while saving settings');
    } finally {
      setSaving(false);
    }
  };

  const debouncedSearch = useMemo(
    () =>
      debounce((value) => {
        xhrGet(`/api/user/settings/autocomplete?q=${encodeURIComponent(value)}`)
          .then((response) => {
            if (response.status === 200) {
              setDataSource(response.json);
            }
          })
          .catch(() => {
            // Silently fail for autocomplete
          });
      }, 300),
    [],
  );

  const searchAddress = (value) => {
    if (!value) {
      setDataSource([]);
      return;
    }
    debouncedSearch(value);
  };

  if (loading) {
    return null;
  }

  return (
    <div className="user-settings">
      <Title heading={2}>User Specific Settings</Title>
      <Divider />
      <SegmentPart
        name="Distance claculation"
        Icon={IconHome}
        helpText="The address you enter is used to calculate the distance between your chosen location and each listing. The distance is computed using an approximate mathematical method and is intended to give you a rough indication of commute time. If you update your address, we will recalculate the distance for all active listings."
      >
        <div style={{ display: 'flex', flexDirection: 'column', gap: '10px', maxWidth: '600px' }}>
          <AutoComplete
            data={dataSource}
            value={address}
            onChange={(v) => setAddress(v)}
            onSearch={searchAddress}
            placeholder="Enter your home address"
            style={{ width: '100%' }}
          />
          {coords && coords.lat === -1 && (
            <Banner type="danger" description="Address found but could not be geocoded accurately." closeIcon={null} />
          )}
        </div>
      </SegmentPart>
      <Divider />
      <div style={{ marginTop: '20px' }}>
        <Button icon={<IconSave />} theme="solid" type="primary" onClick={handleSave} loading={saving}>
          Save Settings
        </Button>
      </div>
    </div>
  );
};

export default UserSettings;