GMiOS/app/Sync.swift

// Copyright (C) 2016 Inigo Valentin
//
// This file is part of the Gasteizko Margolariak IOS app.
//
// The Gasteizko Margolariak IOS app is free software: you can
// redistribute it and/or modify it under the terms of the
// GNU General Public License as published by the Free Software
// Foundation, either version 3 of the License, or (at your
// option) any later version.
//
// The Gasteizko Margolariak IOS app is distributed in the
// hope that it will be useful, but WITHOUT ANY WARRANTY;
// without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
// Public License for more details.
//
// You should have received a copy of the GNU General Public
// License along with the Gasteizko Margolariak IOS app.
// If not, see <http://www.gnu.org/licenses/>.

import Foundation

/**
 Class to handle server sync.
 */
class Sync{
    
    /**
     Starts the sync process.
    */
    init(){
        let url = buildUrl();
        sync(url: url)
    
    }
    
    /**
     Builds the URL to perform the sync against.
     :returns: The URL.
    */
    func buildUrl() -> URL{
        let url = URL(string: "https://margolariak.com/API/v1/sync.php?client=com.margolariak.app")
        //TODO add parameters
        return url!
        
    }
    
    /**
     Performs an asynchronous sync.
     It fethes the info from the server and stores as Core Data
     :param: url The url to sync.
    */
    func sync(url: URL){
        
        //Synchronously get data
        let task = URLSession.shared.dataTask(with: url) { data, response, error in
            guard error == nil else {
                print("error")
                return
            }
            guard let data = data else {
                print("Data is empty")
                return
            }
            
            print("Got the Sync JSON")
            
            var strData = String(data:data, encoding: String.Encoding.utf8)
            
            let dataIdx = strData?.indexOf(target: "{\"data\"")
            strData = strData!.subStr(start: dataIdx!, end: strData!.length - 1)
            
            //TODO: do something with versions
            
            let dataActivities : [String] = self.getTable(data: strData!, table: "activity")
            
        }
        
        task.resume()

    }
    
    func getTable(data: String, table: String) -> [String]{
        let iS : Int? = data.indexOf(target: table)
        var str = data.subStr(start: iS!, end: data.length - 1)
        let iE : Int? = str.indexOf(target: "}]}")!
        str = str.subStr(start: 0, end: iE!)
        str = str.subStr(start: table.length + 3,end: str.length - 1)
        
        //Separate the entries
        var entries : [String] = str.components(separatedBy: "},{")
        
        //Modify the first and the last one to remove bracers
        entries[0] = entries[0].subStr(start: 1, end: entries[0].length - 1)
        entries[entries.count - 1] = entries[entries.count - 1].subStr(start: 0, end: entries[entries.count - 1].length - 2)
        
        //Return the array
        return entries
    }
    
}