/// a unique identifier for this particular occurrence of the problem

public let id: IdType?

// public let links: Links? // we skip this for now to avoid adding complexity to using this basic type.

/// the HTTP status code applicable to this problem

public let status: String?

/// an application-specific error code

public let code: String?

/// a short, human-readable summary of the problem that SHOULD NOT change from occurrence to occurrence of the problem, except for purposes of localization

public let title: String?

/// a human-readable explanation specific to this occurrence of the problem. Like `title`, this field’s value can be localized

public let detail: String?

/// an object containing references to the source of the error

public let source: Source?

// public let meta: Meta? // we skip this for now to avoid adding complexity to using this basic type

public init(id: IdType? = nil,

status: String? = nil,

code: String? = nil,

title: String? = nil,

detail: String? = nil,

source: Source? = nil) {

self.id = id

self.status = status

self.code = code

self.title = title

self.detail = detail

self.source = source

}

public struct Source: Codable, Equatable {

/// a JSON Pointer [RFC6901] to the associated entity in the request document [e.g. "/data" for a primary data object, or "/data/attributes/title" for a specific attribute].

public let pointer: String?

/// which URI query parameter caused the error

public let parameter: String?

public init(pointer: String? = nil,

parameter: String? = nil) {

self.pointer = pointer

self.parameter = parameter

}

}

public var definedFields: [String: String] {

let keysAndValues = [

id.map { ("id", String(describing: $0)) },

status.map { ("status", $0) },

code.map { ("code", $0) },

title.map { ("title", $0) },

detail.map { ("detail", $0) },

source.flatMap { $0.pointer.map { ("pointer", $0) } },

source.flatMap { $0.parameter.map { ("parameter", $0) } }

].compactMap { $0 }

return Dictionary(uniqueKeysWithValues: keysAndValues)

}

public var description: String {

return definedFields.map { "\($0.key): \($0.value)" }.sorted().joined(separator: ", ")

}