import Foundation

let payload1 = """

{
    "coordinates": [
        {
            "latitude": 37.332,
            "longitude": -122.011
        }
    ]
}

""".data(using: .utf8)!

let payload2 = """

{
    "coordinates": [
       [37.332,-122.011]
    ]
}

""".data(using: .utf8)!

let payload3 = """

{
    "coordinates": [
       "37.332,-122.011"
    ]
}

""".data(using: .utf8)!

struct Place: Codable {

    let latitude: Double
    let longitude: Double

    private enum CodingKeys: String, CodingKey {
        case latitude
        case longitude
    }

    init(from decoder: Decoder) throws {

        if let container = try? decoder.container(keyedBy: CodingKeys.self) {
            self.latitude = try container.decode(Double.self, forKey: .latitude)
            self.longitude = try container.decode(Double.self, forKey: .longitude)
        }
        else if var container = try? decoder.unkeyedContainer() {
            self.latitude = try container.decode(Double.self)
            self.longitude = try container.decode(Double.self)
        }
        else if let container = try? decoder.singleValueContainer() {
            let value = try container.decode(String.self)
            let values = value.components(separatedBy: ",")

            guard values.count == 2,
                  let latiude = Double(values[0]),
                let longitude = Double(values[1]) else {
                    throw DecodingError.dataCorruptedError(in: container, debugDescription: "Unable to decode coordinate")
            }

            self.latitude = latiude
            self.longitude = longitude
        }
        else {
            let context = DecodingError.Context.init(codingPath: decoder.codingPath, debugDescription: "Unable to decode!")
            throw DecodingError.dataCorrupted(context)
       }
    }
}

if let payload1Dict = try? JSONDecoder().decode([String: [Place]].self, from: payload1) {
    print("Payload1: \(payload1Dict)")
}

if let payload1Dict = try? JSONDecoder().decode([String: [Place]].self, from: payload2) {
    print("Payload2: \(payload1Dict)")
}

if let payload1Dict = try? JSONDecoder().decode([String: [Place]].self, from: payload3) {
    print("Payload1: \(payload1Dict)")
}