FeatureID.swift

/// A GeoJSON identifier that can either be a string or number.
public enum Identifier: Equatable, Hashable, CustomStringConvertible, Sendable {
    case string(String)
    case int(Int64)
    case double(Double)

    public init?(value: Any?) {
        guard let value else { return nil }
        if let int = value as? Int64 {
            self = .int(int)
        }
        else if let string = value as? String {
            self = .string(string)
        }
        else if let double = value as? Double {
            self = .double(double)
        }
        else {
            return nil
        }
    }

    public var asJson: Any {
        switch self {
        case .double(let double): return double
        case .int(let int): return int
        case .string(let string): return string
        }
    }

    public var description: String {
        switch self {
        case .double(let double): return String(double)
        case .int(let int): return String(int)
        case .string(let string): return string
        }
    }
}


func testLoadJsonWithInt64Id() throws {
    let bigInt64: Int64 = 0xFFFFFFFFFFFFFFF
    let featureJsonWithInt64Id = """
    {
       "type": "Feature",
       "geometry": {
           "type": "Polygon",
           "coordinates": [
               [
                   [100.0, 0.0],
                   [101.0, 0.0],
                   [101.0, 1.0],
                   [100.0, 1.0],
                   [100.0, 0.0]
               ]
           ]
       },
       "properties": {
           "prop0": "value0",
           "prop1": {
               "this": "that"
           }
       },
       "other": "something else",
       "id": \(bigInt64)
    }
    """

    let feature = try XCTUnwrap(Feature(jsonString: featureJsonWithInt64Id))

    XCTAssertEqual(feature.id, .int(bigInt64))
    XCTAssertEqual(feature.projection, .epsg4326)
}