/**
 * @ai-summary Form for searching nearby gas stations
 */

import React, { useState, useEffect } from 'react';
import {
  Box,
  TextField,
  Button,
  Slider,
  FormControl,
  FormLabel,
  Alert,
  CircularProgress,
  InputAdornment
} from '@mui/material';
import LocationIcon from '@mui/icons-material/LocationOn';
import MyLocationIcon from '@mui/icons-material/MyLocation';
import { StationSearchRequest, GeolocationError } from '../types/stations.types';
import { useGeolocation } from '../hooks';

interface StationsSearchFormProps {
  onSearch: (request: StationSearchRequest) => void;
  isSearching?: boolean;
}

/**
 * Search form with manual location input and geolocation button
 * Radius slider: 1-25 miles, default 5 miles
 */
export const StationsSearchForm: React.FC<StationsSearchFormProps> = ({
  onSearch,
  isSearching = false
}) => {
  const [latitude, setLatitude] = useState<number | ''>('');
  const [longitude, setLongitude] = useState<number | ''>('');
  const [radius, setRadius] = useState(5); // Miles
  const [locationError, setLocationError] = useState<string | null>(null);

  const {
    coordinates,
    isPending: isGeolocating,
    error: geoError,
    requestPermission,
    clearError: clearGeoError
  } = useGeolocation();

  // Update form when geolocation succeeds
  useEffect(() => {
    if (coordinates) {
      setLatitude(coordinates.latitude);
      setLongitude(coordinates.longitude);
      setLocationError(null);
    }
  }, [coordinates]);

  // Handle geolocation errors
  useEffect(() => {
    if (geoError) {
      if (geoError === GeolocationError.PERMISSION_DENIED) {
        setLocationError('Location permission denied. Please enable it in browser settings.');
      } else if (geoError === GeolocationError.TIMEOUT) {
        setLocationError('Location request timed out. Try again.');
      } else if (geoError === GeolocationError.POSITION_UNAVAILABLE) {
        setLocationError('Location not available. Try a different device.');
      } else {
        setLocationError('Unable to get location. Please enter manually.');
      }
    }
  }, [geoError]);

  const handleUseCurrentLocation = () => {
    clearGeoError();
    requestPermission();
  };

  const handleSearch = () => {
    if (latitude === '' || longitude === '') {
      setLocationError('Please enter coordinates or use current location');
      return;
    }

    const request: StationSearchRequest = {
      latitude: typeof latitude === 'number' ? latitude : 0,
      longitude: typeof longitude === 'number' ? longitude : 0,
      radius: radius * 1609.34 // Convert miles to meters
    };

    onSearch(request);
  };

  const handleRadiusChange = (
    _event: Event,
    newValue: number | number[]
  ) => {
    if (typeof newValue === 'number') {
      setRadius(newValue);
    }
  };

  return (
    <Box
      component="form"
      onSubmit={(e) => {
        e.preventDefault();
        handleSearch();
      }}
      sx={{ padding: 2, display: 'flex', flexDirection: 'column', gap: 2 }}
    >
      {/* Geolocation Button */}
      <Button
        variant="contained"
        startIcon={isGeolocating ? <CircularProgress size={20} /> : <MyLocationIcon />}
        onClick={handleUseCurrentLocation}
        disabled={isGeolocating}
        fullWidth
      >
        {isGeolocating ? 'Getting location...' : 'Use Current Location'}
      </Button>

      {/* Or Divider */}
      <Box sx={{ textAlign: 'center', color: 'textSecondary' }}>or</Box>

      {/* Manual Latitude Input */}
      <TextField
        label="Latitude"
        type="number"
        value={latitude}
        onChange={(e) => {
          const val = e.target.value;
          setLatitude(val === '' ? '' : parseFloat(val));
        }}
        placeholder="37.7749"
        inputProps={{ step: '0.0001', min: '-90', max: '90' }}
        fullWidth
        InputProps={{
          startAdornment: (
            <InputAdornment position="start">
              <LocationIcon />
            </InputAdornment>
          )
        }}
      />

      {/* Manual Longitude Input */}
      <TextField
        label="Longitude"
        type="number"
        value={longitude}
        onChange={(e) => {
          const val = e.target.value;
          setLongitude(val === '' ? '' : parseFloat(val));
        }}
        placeholder="-122.4194"
        inputProps={{ step: '0.0001', min: '-180', max: '180' }}
        fullWidth
        InputProps={{
          startAdornment: (
            <InputAdornment position="start">
              <LocationIcon />
            </InputAdornment>
          )
        }}
      />

      {/* Radius Slider */}
      <FormControl fullWidth>
        <FormLabel>Search Radius: {radius} mi</FormLabel>
        <Slider
          value={radius}
          onChange={handleRadiusChange}
          min={1}
          max={25}
          step={0.5}
          marks={[
            { value: 1, label: '1 mi' },
            { value: 5, label: '5 mi' },
            { value: 10, label: '10 mi' },
            { value: 25, label: '25 mi' }
          ]}
          sx={{ marginTop: 2, marginBottom: 1 }}
        />
      </FormControl>

      {/* Error Messages */}
      {locationError && (
        <Alert severity="error">{locationError}</Alert>
      )}

      {/* Search Button */}
      <Button
        variant="contained"
        color="primary"
        onClick={handleSearch}
        disabled={isSearching || latitude === '' || longitude === ''}
        sx={{
          minHeight: '44px',
          marginTop: 1
        }}
      >
        {isSearching ? <CircularProgress size={24} /> : 'Search Stations'}
      </Button>
    </Box>
  );
};

export default StationsSearchForm;