using GoogleApi.Entities.Common;
using GoogleApi.Entities.Maps.Geocoding.Common;
using Svrnty.GeoManagement.Abstractions.Models;

namespace Svrnty.GeoManagement.Google.Mapping;

/// <summary>
/// Maps Google Geocoding API responses to Address models
/// </summary>
internal static class GoogleAddressMapper
{
  public static Abstractions.Models.Address? MapToAddress(Result? googleResult)
  {
    if (googleResult == null)
      return null;

    var components = googleResult.AddressComponents;
    if (components == null || !components.Any())
      return null;

    var line1 = BuildLine1(components);
    var line2 = GetComponentValue(components, "subpremise");
    var city = GetCity(components);
    var subdivision = GetSubdivision(components);
    var postalCode = GetComponentValue(components, "postal_code") ?? string.Empty;
    var country = GetComponentValue(components, "country") ?? string.Empty;

    var location = googleResult.Geometry?.Location != null
      ? new GeoPoint((decimal)googleResult.Geometry.Location.Latitude, (decimal)googleResult.Geometry.Location.Longitude)
      : null;

    return new Abstractions.Models.Address(Normalized: true)
    {
      Line1 = line1,
      Line2 = line2,
      City = city,
      Subdivision = subdivision,
      PostalCode = postalCode,
      Country = country,
      Location = location,
      Note = null
    };
  }

  private static string BuildLine1(IEnumerable<AddressComponent> components)
  {
    var streetNumber = GetComponentValue(components, "street_number");
    var route = GetComponentValue(components, "route");

    if (!string.IsNullOrWhiteSpace(streetNumber) && !string.IsNullOrWhiteSpace(route))
      return $"{streetNumber} {route}";

    return route ?? streetNumber ?? string.Empty;
  }

  private static string GetCity(IEnumerable<AddressComponent> components)
  {
    return GetComponentValue(components, "locality")
           ?? GetComponentValue(components, "postal_town")
           ?? GetComponentValue(components, "administrative_area_level_2")
           ?? string.Empty;
  }

  private static string GetSubdivision(IEnumerable<AddressComponent> components)
  {
    return GetComponentValue(components, "administrative_area_level_1") ?? string.Empty;
  }

  private static string? GetComponentValue(IEnumerable<AddressComponent> components, string type)
  {
    var component = components.FirstOrDefault(c =>
      c.Types.Any(t => t.ToString().ToLower().Replace("_", "") == type.Replace("_", "")));
    return component?.ShortName;
  }

  public static GeoPoint? MapToGeoPoint(Result? googleResult)
  {
    if (googleResult?.Geometry?.Location == null)
      return null;

    return new GeoPoint(
      (decimal)googleResult.Geometry.Location.Latitude,
      (decimal)googleResult.Geometry.Location.Longitude
    );
  }
}