// Example usage of Institute Geocoder functions
// This file demonstrates how to integrate the geocoding functions in your frontend

import { createClient } from '@supabase/supabase-js'

// Initialize Supabase client
const supabaseUrl = process.env.NEXT_PUBLIC_SUPABASE_URL!
const supabaseAnonKey = process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY!
const supabase = createClient(supabaseUrl, supabaseAnonKey)

// Types for institute data
interface Institute {
  id: string
  name: string
  address: {
    street?: string
    town?: string
    county?: string
    postcode?: string
    country?: string
  }
  geo_coordinates?: {
    latitude: number
    longitude: number
    boundingbox: string[]
    search_query: string
    geocoded_at: string
  }
}

interface GeocodingResult {
  success: boolean
  message: string
  coordinates?: {
    latitude: number
    longitude: number
    boundingbox: string[]
  }
  error?: string
}

// 1. Geocode a single institute
export async function geocodeInstitute(instituteId: string): Promise<GeocodingResult> {
  try {
    const { data, error } = await supabase.functions.invoke('institute-geocoder', {
      body: { institute_id: instituteId }
    })

    if (error) {
      throw new Error(error.message)
    }

    return data
  } catch (error) {
    console.error('Geocoding failed:', error)
    return {
      success: false,
      message: 'Geocoding failed',
      error: error instanceof Error ? error.message : 'Unknown error'
    }
  }
}

// 2. Batch geocode multiple institutes
export async function batchGeocodeInstitutes(
  limit: number = 10,
  forceRefresh: boolean = false
): Promise<any> {
  try {
    const { data, error } = await supabase.functions.invoke('institute-geocoder/batch', {
      body: { 
        limit,
        force_refresh: forceRefresh
      }
    })

    if (error) {
      throw new Error(error.message)
    }

    return data
  } catch (error) {
    console.error('Batch geocoding failed:', error)
    throw error
  }
}

// 3. Get institutes that need geocoding
export async function getInstitutesNeedingGeocoding(): Promise<Institute[]> {
  try {
    const { data, error } = await supabase
      .from('institutes')
      .select('id, name, address, geo_coordinates')
      .or('geo_coordinates.is.null,geo_coordinates.eq.{}')
      .not('import_id', 'is', null)

    if (error) {
      throw new Error(error.message)
    }

    return data || []
  } catch (error) {
    console.error('Failed to fetch institutes:', error)
    return []
  }
}

// 4. Display institute on a map (example with Leaflet)
export function displayInstituteOnMap(
  institute: Institute,
  mapElement: HTMLElement
): void {
  if (!institute.geo_coordinates) {
    console.warn('Institute has no coordinates:', institute.name)
    return
  }

  // This is a placeholder - you'd need to implement actual map rendering
  // For example, using Leaflet, Mapbox, or Google Maps
  const { latitude, longitude } = institute.geo_coordinates
  
  console.log(`Displaying ${institute.name} at ${latitude}, ${longitude}`)
  
  // Example map implementation:
  // const map = L.map(mapElement).setView([latitude, longitude], 13)
  // L.marker([latitude, longitude]).addTo(map).bindPopup(institute.name)
}

// 5. React component example
export function InstituteGeocoder() {
  const [institutes, setInstitutes] = useState<Institute[]>([])
  const [loading, setLoading] = useState(false)
  const [geocodingProgress, setGeocodingProgress] = useState(0)

  // Load institutes that need geocoding
  useEffect(() => {
    loadInstitutes()
  }, [])

  async function loadInstitutes() {
    const data = await getInstitutesNeedingGeocoding()
    setInstitutes(data)
  }

  // Geocode all institutes
  async function geocodeAllInstitutes() {
    setLoading(true)
    setGeocodingProgress(0)

    try {
      const result = await batchGeocodeInstitutes(institutes.length, false)
      
      if (result.success) {
        setGeocodingProgress(100)
        // Reload institutes to show updated coordinates
        await loadInstitutes()
      }
    } catch (error) {
      console.error('Batch geocoding failed:', error)
    } finally {
      setLoading(false)
    }
  }

  // Geocode single institute
  async function geocodeSingleInstitute(instituteId: string) {
    try {
      const result = await geocodeInstitute(instituteId)
      if (result.success) {
        // Reload institutes to show updated coordinates
        await loadInstitutes()
      }
    } catch (error) {
      console.error('Single geocoding failed:', error)
    }
  }

  return (
    <div className="institute-geocoder">
      <h2>Institute Geocoding</h2>
      
      <div className="controls">
        <button 
          onClick={geocodeAllInstitutes}
          disabled={loading || institutes.length === 0}
        >
          {loading ? 'Geocoding...' : `Geocode All (${institutes.length})`}
        </button>
        
        {loading && (
          <div className="progress">
            <div 
              className="progress-bar" 
              style={{ width: `${geocodingProgress}%` }}
            />
          </div>
        )}
      </div>

      <div className="institutes-list">
        {institutes.map(institute => (
          <div key={institute.id} className="institute-item">
            <h3>{institute.name}</h3>
            <p>
              {institute.address.street && `${institute.address.street}, `}
              {institute.address.town && `${institute.address.town}, `}
              {institute.address.county && `${institute.address.county}, `}
              {institute.address.postcode}
            </p>
            
            {institute.geo_coordinates ? (
              <div className="coordinates">
                <span>📍 {institute.geo_coordinates.latitude}, {institute.geo_coordinates.longitude}</span>
                <span>Geocoded: {new Date(institute.geo_coordinates.geocoded_at).toLocaleDateString()}</span>
              </div>
            ) : (
              <button 
                onClick={() => geocodeSingleInstitute(institute.id)}
                disabled={loading}
              >
                Geocode
              </button>
            )}
          </div>
        ))}
      </div>
    </div>
  )
}

// 6. Utility functions for working with coordinates
export class CoordinateUtils {
  // Calculate distance between two points (Haversine formula)
  static calculateDistance(
    lat1: number, 
    lon1: number, 
    lat2: number, 
    lon2: number
  ): number {
    const R = 6371 // Earth's radius in kilometers
    const dLat = this.toRadians(lat2 - lat1)
    const dLon = this.toRadians(lon2 - lon1)
    
    const a = 
      Math.sin(dLat / 2) * Math.sin(dLat / 2) +
      Math.cos(this.toRadians(lat1)) * Math.cos(this.toRadians(lat2)) *
      Math.sin(dLon / 2) * Math.sin(dLon / 2)
    
    const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a))
    return R * c
  }

  // Convert degrees to radians
  private static toRadians(degrees: number): number {
    return degrees * (Math.PI / 180)
  }

  // Check if coordinates are within a bounding box
  static isWithinBounds(
    lat: number,
    lon: number,
    bounds: [number, number, number, number] // [minLat, maxLat, minLon, maxLon]
  ): boolean {
    return lat >= bounds[0] && lat <= bounds[1] && 
           lon >= bounds[2] && lon <= bounds[3]
  }

  // Format coordinates for display
  static formatCoordinates(lat: number, lon: number): string {
    const latDir = lat >= 0 ? 'N' : 'S'
    const lonDir = lon >= 0 ? 'E' : 'W'
    return `${Math.abs(lat).toFixed(6)}°${latDir}, ${Math.abs(lon).toFixed(6)}°${lonDir}`
  }
}

// 7. Example of using coordinates in Neo4j queries
export const neo4jQueries = {
  // Create institute node with location
  createInstituteWithLocation: `
    CREATE (i:Institute {
      id: $institute_id,
      name: $name,
      location: point({latitude: $latitude, longitude: $longitude})
    })
    RETURN i
  `,

  // Find institutes within radius
  findInstitutesWithinRadius: `
    MATCH (i:Institute)
    WHERE distance(i.location, point({latitude: $centerLat, longitude: $centerLon})) < $radiusMeters
    RETURN i, distance(i.location, point({latitude: $centerLat, longitude: $centerLon})) as distance
    ORDER BY distance
  `,

  // Find institutes in bounding box
  findInstitutesInBounds: `
    MATCH (i:Institute)
    WHERE i.location.latitude >= $minLat 
      AND i.location.latitude <= $maxLat
      AND i.location.longitude >= $minLon 
      AND i.location.longitude <= $maxLon
    RETURN i
  `
}

export default {
  geocodeInstitute,
  batchGeocodeInstitutes,
  getInstitutesNeedingGeocoding,
  displayInstituteOnMap,
  InstituteGeocoder,
  CoordinateUtils,
  neo4jQueries
}