import Firebase
import FirebaseHelper

let firebaseHelper = FirebaseHelper(FirebaseDatabase.Database.database().reference())

extension FirebaseHelper {
    static let main: FirebaseHelper = {
        FirebaseHelper(FirebaseDatabase.Database.database().reference())
    }()
}

FirebaseHelper.main.get("users", "john123", "favoriteFood") { result in
    switch result {
      case .failure(let error):
        // handle error
      case .success(let data):
        // get string from data
    }
}

public func get(_ first: String, _ rest: String..., completion: @escaping (Result<DataSnapshot, Error>) -> Void)

public enum Result<T, Error> {
    case success(T)
    case failure(Error)
}

// The first parameter is an `Any` that gets set at the specified path.
FirebaseHelper.main.set("pizza", at: "users", "john123", "favoriteFood") { error in
    if let error = error {
      // handle error
  }
}

FirebaseHelper.main.delete("users", "john123", "favoriteFood") { error in
    if let error = error {
      // handle error
  }
}

FirebaseHelper.main.increment(by: 5, "users", "john123", "favoriteFoodEatenThisMonth") {
    if let error = error {
      // handle error
  }
}

public func set(_ value: Any, at first: String, _ rest: String..., completion: @escaping (Error?) -> Void)

public func delete(_ first: String, _ rest: String..., completion: @escaping (Error?) -> Void)

public func increment(by amount: Int, at first: String, _ rest: String..., completion: @escaping (Error?) -> Void)

let ref = try? FirebaseHelper.main.makeReference("users", "john123", "eatingHistory")
let handle = ref?.queryOrdered(byChild: "timestamp").queryLimited(toLast: 50).observe(.value) { data in
    // handle data
}

public func makeReference(_ first: String, _ rest: String...) throws -> DatabaseReference