//
//  AmazonXmlBody.swift
//  Vendoo
//
//  Created by cole alban on 8/29/16.
//  Copyright © 2016 Okechi Onyeje. All rights reserved.
//

import Foundation

/*
 This class will represent the xml body of an xml feed for Amazon
 */
class AmazonXmlBody{
    
    private var listing: AmazonListing
    private var xmlString: String
    
    //Init will take in a listing and parse it into the xml string
    init(listing: AmazonListing){
        self.listing = listing
        self.xmlString = parseListing(self.listing)
    }
    
    
    /*
     This helper function will take in a listing and insert the pertinent 
     information into the respective locations.
     listing: The listing to parse into the xml string
     return: The xml string with all pertinent order information
     */
    private func parseListing(listing: AmazonListing)->String{
        var xmlTemplate = getXmlTemplate()
        xmlTemplate.replace("{{target}}", replacement: self.listing.title)
        xmlTemplate.replace("{{description}}", replacement: self.listing.description)
        xmlTemplate.replace("{{price}}", replacement: self.listing.title)
        return xmlTemplate
    }
    
    /*
     This function will get the initial XML template
     return: String representing the xml template
    */
    private func getXmlTemplate()->String{
        var xmlString: String
        let manager = NSFileManager.defaultManager()
        let path = manager.currentDirectoryPath+"/feedSubmissionTemplate.xml"
        do{
            xmlString = try{
                NSString(contentsOfURL: path, encoding: String.encoding.utf8.rawValue) as String
            }
            return xmlString
        }
        catch{
            return "Error"
        }
    }
    
    
    
}


//A small extension to give string a replace function with persistence
extenstion String{
    
    /*
     Replaces target with replacement in the string instance.
     Target: The string to replace
     replacement: The new string to insert
     return: the new string with the replaced snippet
    */
    func replace(target: String, replacement: String)->String{
        self = self.stringByReplacingOccurrencesOfString(target, withString: replacement)
    }
}