using ShippingCosts.Contracts;

namespace ShippingCosts.Implementations;

/// <summary>
///     Default implementation of <see cref="ICountryDistanceProvider" /> providing distance information
///     for several countries
/// </summary>
/// <inheritdoc cref="ICountryDistanceProvider" />
public sealed class CountryDistanceProvider : ICountryDistanceProvider
{
    private static readonly Dictionary<string, CountryDistanceInformation> distanceDatabase = new()
    {
        ["Brazil"] = new CountryDistanceInformation(9820, false, false),
        ["China"] = new CountryDistanceInformation(7466, false, false),
        ["Egypt"] = new CountryDistanceInformation(2906, false, false),
        ["France"] = new CountryDistanceInformation(1036, false, true),
        ["Germany"] = new CountryDistanceInformation(524, true, true),
        ["India"] = new CountryDistanceInformation(6186, false, false),
        ["Israel"] = new CountryDistanceInformation(2739, false, false),
        ["Italy"] = new CountryDistanceInformation(763, true, true),
        ["Japan"] = new CountryDistanceInformation(9278, false, false),
        ["Malaysia"] = new CountryDistanceInformation(9766, false, false),
        ["Namibia"] = new CountryDistanceInformation(8239, false, false),
        ["United Kingdom"] = new CountryDistanceInformation(1228, false, false),
        ["United States"] = new CountryDistanceInformation(7832, false, false),
        ["Switzerland"] = new CountryDistanceInformation(692, true, false)
    };

    public CountryDistanceInformation? GetDistanceTo(string countryName)
    {
        bool success = distanceDatabase.TryGetValue(countryName, out var distance);
        return success ? distance : null;
    }

    public bool IsPossibleCountry(string countryName)
    {
        var country = GetDistanceTo(countryName);
        return country != null;
    }
}