//

// TranscriptsJSONAdapter.swift

// WWDC

//

// Created by Guilherme Rambo on 20/02/17.

// Copyright © 2017 Guilherme Rambo. All rights reserved.

//

import Foundation

import SwiftyJSON

private enum TranscriptKeys: String, JSONSubscriptType {

case year, number, transcript, timecodes, annotations

var jsonKey: JSONKey {

return JSONKey.key(rawValue)

}

}

final class TranscriptsJSONAdapter: Adapter {

typealias InputType = JSON

typealias OutputType = Transcript

func adapt(_ input: JSON) -> Result<Transcript, AdapterError> {

guard let year = input[TranscriptKeys.year].int else {

return .error(.missingKey(TranscriptKeys.year))

}

guard let number = input[TranscriptKeys.number].int else {

return .error(.missingKey(TranscriptKeys.number))

}

// guard let fullText = input[TranscriptKeys.transcript].string else {

// return .error(.missingKey(TranscriptKeys.transcript))

// }

guard let timecodes = input[TranscriptKeys.timecodes].array else {

return .error(.missingKey(TranscriptKeys.timecodes))

}

guard let annotationsJson = input[TranscriptKeys.annotations].array else {

return .error(.missingKey(TranscriptKeys.annotations))

}

let annotations: [TranscriptAnnotation] = zip(timecodes, annotationsJson).flatMap { time, body in

guard let time = time.double, let body = body.string else { return nil }

let annotation = TranscriptAnnotation()

annotation.timecode = time

annotation.body = body

return annotation

}

let transcript = Transcript()

transcript.identifier = "\(year)-\(number)"

// transcript.fullText = fullText

transcript.annotations.append(objectsIn: annotations)

return .success(transcript)

}

}