//
//  AmazonRequest.swift
//  Vendoo
//
//  Created by cole alban on 8/28/16.
//  Copyright © 2016 Okechi Onyeje. All rights reserved.
//

import Foundation


/*
 This class will represent a request to the Amazon MWS API.
 It will contain methods for creating headers, getting the 
 headers back as a queryString(used to sign the request), and 
 metadata regarding the transaction.
 */
class AmazonRequest{
    
    
    /*
     This helper function will set the headers for the posting a new item to mws
     request: The request headers will be set for
     feedType: The type of feed this request will be for
     */
    func setRequestHeaders(request: NSMutableURLRequest, feedType: FeedType ){
        request.HTTPMethod = "POST"
        request.addValue("text/xml", forHTTPHeaderField: "Content-Type")
        request.addValue("SubmitFeed", forHTTPHeaderField: "Action")
        request.addValue(self.awsAccessKeyId, forHTTPHeaderField: "AWSAccessKeyId")
        request.addValue(self.sellerId, forHTTPHeaderField: "Merchant")
        request.addValue(getIso8601DateTimeString(), forHTTPHeaderField: "Timestamp")
        request.addValue("2009-01-01", forHTTPHeaderField: "Version")
        request.addValue(feedType.rawValue, forHTTPHeaderField: "FeedType")
        request.addValue("HmacSHA256", forHTTPHeaderField: "SignatureMethod")
        request.addValue("2", forHTTPHeaderField: "SignatureVersion")
    }
    
    /*
     This helper function will return an iso8601 formatted datetime string
     return: an iso8601 formatted datetime string
     */
    func getIso8601DateTimeString()->String{
        let dateFormatter: NSDateFormatter = NSDateFormatter()
        dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"
        dateFormatter.timeZone = NSTimeZone(forSecondsFromGMT: 0)
        dateFormatter.locale = NSLocale(localeIdentifier: "en_US_POSIX")
        return dateFormatter.stringFromDate(NSDate())
    }
    
    
    /*
     This will return a properly formatted header in string form
     Note: This is before the query is signed.
    */
    func getRequestHeaderAsString(request: NSMutableURLRequest)->String{
        var queryString: String = "POST\nmws.amazonservices.com\n\\"+
        queryString += "AwsAccessKeyId="+request.valueForHTTPHeaderField("AwsAccessKeyId")
        queryString += "&Action="+request.valueForHTTPHeaderField("Action")
        queryString += "&FeedType="+request.valueForHTTPHeaderField("FeedType")
        queryString += "&SellerId="+request.valueForHTTPHeaderField("SellerId")
        queryString += "&SignatureMethod="+request.valueForHTTPHeaderField("SignatureMethod")
        queryString += "&SignatureVersion="+request.valueForHTTPHeaderField("SignatureVersion")
        queryString += "&Timestamp="+request.valueForHTTPHeaderField("Timestamp")
        queryString += "&Version="+request.valueForHTTPHeaderField("Version")
        return queryString
    }

}