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import Foundation
import StitchCore
import StitchAWSService
import StitchCoreAWSService
import MongoSwift

class AWS {
  static var uploadToS3: Bool = true
  
  static func uploadImage(image: Data, email imageName: String, tag: String, _ completionHandler: @escaping ((String) -> Void)) {
    guard uploadToS3 else {
      print("Skip S3")
      completionHandler("")
      return
    }
    
    // MyAwsService is the name of the aws service you created in
    // the stitch UI, and it is configured with a rule
    // that allows the PutObject action on the s3 API
    let aws = stitch.serviceClient(fromFactory: awsServiceClientFactory, withName: "AWS")
    
    guard let imageBSON = try? Binary(data: image, subtype: .generic) else {
      ErrorReporter.raiseError("Failed to convert image to BSON")
      print("Failed to convert the image to BSON")
      completionHandler("")
      return
    }
    
    // These are the arguments specifically for s3 service PutObject function
    let args: Document = [
      "Bucket": Constants.S3_BUCKET_NAME,
       "Key": "\(imageName)-\(tag)",
       "ACL": "public-read",
       "ContentType": "image/jpeg",
       "Body": imageBSON,
       // or "Body": Binary.init(...)
    ]

    guard  let request = try? AWSRequestBuilder()
      .with(service: "s3")
      .with(action: "PutObject")
      .with(region: Constants.AWS_REGION) // this is optional
      .with(arguments: args) // depending on the service and action, this may be optional as well
      .build() else
    {
      ErrorReporter.raiseError("Could not create S3 request")
      completionHandler("")
      return
    }

    aws.execute(request: request) { (result: StitchResult<Document>) in
      switch result {
      case .success(let awsResult):
        print("Executed AWS request \(awsResult)")
        completionHandler("https://\(Constants.S3_BUCKET_NAME).s3.amazonaws.com/\(imageName)-\(tag)")
       case .failure(let awsFailure):
        ErrorReporter.raiseError("Failed to execute AWS request: \(awsFailure)")
        print ("Failed to execute AWS request: \(awsFailure)")
        completionHandler("")
       }
    }
  }
}
