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import Foundation
import SwiftyJSON
@testable import Emitron

extension AttachmentTest {
  enum Mocks {
    static var download: (Attachment, DataCacheUpdate) {
      loadMockFrom(filename: "Attachment_Downloads")
    }
    
    static var stream: (Attachment, DataCacheUpdate) {
      let (attachment, cacheUpdate) = loadMockFrom(filename: "Attachment_Stream")
      return (attachment, cacheUpdate)
    }
    
    private static func loadMockFrom(filename: String) -> (Attachment, DataCacheUpdate) {
      do {
        let bundle = Bundle(for: AttachmentTest.self)
        let fileURL = bundle.url(forResource: filename, withExtension: "json")
        let data = try Data(contentsOf: fileURL!)
        let json = try JSON(data: data)
        
        let document = JSONAPIDocument(json)
        let attachments = try document.data.map { resource in
          try AttachmentAdapter.process(resource: resource)
        }

        let cacheUpdate = try DataCacheUpdate.loadFrom(document: document)
        return (attachments[0], cacheUpdate)
      } catch {
        preconditionFailure("Unable to load Attachment mock: \(error)")
      }
    }
  }
}
