import Foundation

extension Dictionary where Key == String, Value == Any {
    func int(_ key: String) -> Int? {
        return (self[key] as? NSNumber)?.intValue
    }

    func double(_ key: String) -> Double? {
        return (self[key] as? NSNumber)?.doubleValue
    }

    func string(_ key: String) -> String? {
        return self[key] as? String
    }

    func bool(_ key: String) -> Bool {
        return (self[key] as? NSNumber)?.boolValue ?? false
    }

    func dict(_ key: String) -> [String: Any]? {
        return self[key] as? [String: Any]
    }

    func ms(_ key: String) throws -> Int? {
        guard let v = int(key) else {
            return nil
        }
        if v < 0 || v > 600_000 {
            throw ToolError("\(key) must be between 0 and 600000 ms")
        }
        return v
    }

    func require<T>(_ key: String, _ get: (String) -> T?) throws -> T {
        guard let v = get(key) else {
            throw ToolError("missing or malformed argument: \(key)")
        }
        return v
    }
}