.swift

//
//  MainViewController.swift
//  Badges
//
//  Created by Charles Kang on 6/14/16.
//  Copyright © 2016 Charles Kang. All rights reserved.
//

import UIKit
import SwiftyJSON
import SDWebImage

class MainViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate {
    
    var objects = [[String: String]]()
    
    override func viewDidLoad()
    {
        super.viewDidLoad()
        self.parseBadgeJSON()
    }
    
    func parseBadgeJSON ()
    {
        let jsonURL = "http://www.khanacademy.org/api/v1/badges"
        
        if let url = NSURL(string: jsonURL) {
            if let data = try? NSData(contentsOfURL: url, options: []) {
                let json = JSON(data: data)
                
                fetchBadgeJSON(json)
            }
        }
    }
    
    func fetchBadgeJSON(json: JSON)
    {
        for (_, result) in json {
            let title = result["description"].stringValue
            let smallIcon = result["icons"]["small"].stringValue
            let category = result["badge_category"].stringValue
            let points = result["points"].stringValue
            
            let obj = ["title": title, "icon": smallIcon, "category": category, "points": points]
            objects.append(obj)
        }
    }
    
    func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int
    {
        return self.objects.count
    }
    
    func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell
    {
        let cell = collectionView.dequeueReusableCellWithReuseIdentifier("cellIdentifier", forIndexPath: indexPath) as! BadgeCollectionViewCell
        
        cell.layer.borderColor = UIColor.blackColor().CGColor
        cell.layer.borderWidth = 1
        cell.layer.cornerRadius = 10
        
        let orderedDict = objects.sort {
            if ($0["category"] == $1["category"]) {
                return $0["category"] < $1["category"]
            } else {
                return $0["category"] < $1["category"]
            }
        }
        
        let object = orderedDict[indexPath.row]
        cell.badgeLabel.text = object["title"]
        
        let imageURL: NSURL? = NSURL(string: object["icon"]!)
        
        if let url = imageURL {
            cell.badgeImage.sd_setImageWithURL(url)
        }
        return cell
    }
    
    func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath)
    {
        print("You selected badge #\(indexPath.row)")
    }
}