ProductDetailVC.swift

//
//  ProductDetailViewController.swift
//  WalmartLabs
//
//  Created by Charles Kang on 9/7/16.
//  Copyright © 2016 Charles Kang. All rights reserved.
//

import UIKit
import HCSStarRatingView

class ProductDetailViewController: UIViewController {
    
    @IBOutlet weak var productNameLabel: UILabel!
    @IBOutlet weak var productReviewCountLabel: UILabel!
    @IBOutlet weak var productDescTextView: UITextView!
    @IBOutlet weak var productPriceLabel: UILabel!
    @IBOutlet weak var productImageView: UIImageView!
    @IBOutlet weak var outOfStockLabel: UILabel!
    @IBOutlet weak var starRatingView: HCSStarRatingView!
    
    var allProducts = [Product]()
    var selectedIndex = 0
    
    override func viewDidLoad() {
        super.viewDidLoad()
        navigationController!.navigationBar.tintColor = UIColor.whiteColor();
        updateUIWithProduct()
        
        let rightSwipe = UISwipeGestureRecognizer(target: self,
                                                  action: #selector(ProductDetailViewController.handleSwipeGestures(_:)))
        let leftSwipe = UISwipeGestureRecognizer(target: self,
                                                 action: #selector(ProductDetailViewController.handleSwipeGestures(_:)))
        rightSwipe.direction = .Right
        leftSwipe.direction = .Left
        view.addGestureRecognizer(rightSwipe)
        view.addGestureRecognizer(leftSwipe)
    }
    
    func updateUIWithProduct() {
        let product = allProducts[selectedIndex]
        productNameLabel.text = product.productName
        productPriceLabel.text = product.productPrice
        productReviewCountLabel.text = String("(\(product.reviewCount))")
        productDescTextView.text = product.longDesc
        starRatingView.value = CGFloat(product.reviewRating)
        outOfStockLabel.hidden = true
        
        if product.inStock?.boolValue == false {
            outOfStockLabel.hidden = false
            outOfStockLabel.textColor = UIColor.redColor()
        }
        
        let productImageURL: NSURL? = NSURL(string: product.productImage)
        let placeholderImg = UIImage(named: "placeholder_img")
        
        if let imageURL = productImageURL {
            productImageView.sd_setImageWithURL(imageURL, placeholderImage: placeholderImg)
        }
    }
    
    // MARK: - Swipe Animations
    func handleSwipeGestures(sender: UISwipeGestureRecognizer) {
//        let swipes = Swipes()
        if sender.direction == .Right {
            if selectedIndex > 0 {
                selectedIndex -= 1
                updateUIWithProduct()
                animateRightViews()
            }
        } else if sender.direction == .Left {
            if selectedIndex + 1 < allProducts.count {
                selectedIndex += 1
                updateUIWithProduct()
                animateLeftViews()
            }
        }
    }
    
    func animateRightViews(){
        
        let transform = CATransform3DTranslate(CATransform3DIdentity, -500, 0, 0)
        productNameLabel.layer.transform = transform
        productReviewCountLabel.layer.transform = transform
        productDescTextView.layer.transform = transform
        productPriceLabel.layer.transform = transform
        productImageView.layer.transform = transform
        outOfStockLabel.layer.transform = transform
        starRatingView.layer.transform = transform
        
        UIView.animateWithDuration(0.5, animations: { () -> Void in
            self.productNameLabel.layer.transform = CATransform3DIdentity
            self.productReviewCountLabel.layer.transform = CATransform3DIdentity
            self.productDescTextView.layer.transform = CATransform3DIdentity
            self.productPriceLabel.layer.transform = CATransform3DIdentity
            self.productImageView.layer.transform = CATransform3DIdentity
            self.outOfStockLabel.layer.transform = CATransform3DIdentity
            self.starRatingView.layer.transform = CATransform3DIdentity
        })
    }
    
    func animateLeftViews() {
        let transform = CATransform3DTranslate(CATransform3DIdentity, 500, 0, 0)
        productNameLabel.layer.transform = transform
        productReviewCountLabel.layer.transform = transform
        productDescTextView.layer.transform = transform
        productPriceLabel.layer.transform = transform
        productImageView.layer.transform = transform
        outOfStockLabel.layer.transform = transform
        starRatingView.layer.transform = transform
        
        UIView.animateWithDuration(0.5, animations: { () -> Void in
            
            self.productNameLabel.layer.transform = CATransform3DIdentity
            self.productReviewCountLabel.layer.transform = CATransform3DIdentity
            self.productDescTextView.layer.transform = CATransform3DIdentity
            self.productPriceLabel.layer.transform = CATransform3DIdentity
            self.productImageView.layer.transform = CATransform3DIdentity
            self.outOfStockLabel.layer.transform = CATransform3DIdentity
            self.starRatingView.layer.transform = CATransform3DIdentity
        })
    }

}