//
//  JCImageBrowserViewControllerswift
//  JChatSwift
//
//  Created by oshumini on 16/6/7.
//  Copyright © 2016年 HXHG. All rights reserved.
//

import UIKit

class JCImageBrowserViewController: UIViewController {
    
    var messages: [JCMessageType]?
    var conversation: JMSGConversation!
    var currentMessage: JCMessageType!
    var imageArr: [UIImage]!
    var imgCurrentIndex:Int = 0
    
    fileprivate lazy var CellIdentifier = "JCMessageImageCollectionViewCell"
    fileprivate var imageBrowser: UICollectionView!
    fileprivate var imageMessages: [JMSGMessage]!
    fileprivate var isMessageType = false
    
    fileprivate var selectImage: UIImage?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = UIColor.black
        
        if let messages = messages {
            imageMessages = getImageMessages(messages)
            if imageMessages.count > 0 {
                if let index = imageMessages.index(where: { (m) -> Bool in
                    m.msgId == currentMessage.msgId
                }) {
                    imgCurrentIndex = index
                } else {
                    imgCurrentIndex = 0
                }
                isMessageType = true
            }
        }
        
        setupImageBrowser()
    }
    
    override var preferredStatusBarStyle: UIStatusBarStyle {
        return UIStatusBarStyle.lightContent
    }
    
    override func viewDidLayoutSubviews() {
       imageBrowser.scrollToItem(at: IndexPath(item: imgCurrentIndex, section: 0), at: .left, animated: false)
    }
    
    func getImageMessages(_ messages: [JCMessageType]) -> [JMSGMessage] {
        var imageMessages: [JMSGMessage] = []
        for message in messages {
            guard let msg = conversation.message(withMessageId: message.msgId) else {
                continue
            }
            if msg.contentType == .image {
                imageMessages.append(msg)
            }
        }
        return imageMessages
    }
    
    func setupImageBrowser() {
        let flowLayout = UICollectionViewFlowLayout()
        flowLayout.scrollDirection = .horizontal
        flowLayout.minimumLineSpacing = 0
        imageBrowser = UICollectionView(frame: CGRect.zero, collectionViewLayout: flowLayout)
        view.addSubview(imageBrowser)
        imageBrowser.frame = view.frame
        
        imageBrowser.backgroundColor = UIColor.clear
        imageBrowser.delegate = self
        imageBrowser.dataSource = self
        imageBrowser.minimumZoomScale = 0
        imageBrowser.isPagingEnabled = true
        imageBrowser.register(UINib(nibName: "JCMessageImageCollectionViewCell", bundle: nil), forCellWithReuseIdentifier: CellIdentifier)
    }
    
    func singleTapImage(_ gestureRecognizer:UITapGestureRecognizer)  {
        dismiss(animated: true, completion: nil)
    }
    
    func doubleTapImage(_ gestureRecognizer:UITapGestureRecognizer) {
        let cell = imageBrowser.cellForItem(at: currentIndex()) as! JCMessageImageCollectionViewCell
        cell.adjustImageScale()
    }
    
    
    fileprivate func currentIndex() -> IndexPath {
        let itemIndex:Int = Int(imageBrowser.contentOffset.x / imageBrowser.frame.size.width)
        return IndexPath(item: itemIndex, section: 0)
    }

}

extension JCImageBrowserViewController: UICollectionViewDelegate, UICollectionViewDataSource {
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        if isMessageType {
            return imageMessages.count
        }
        return imageArr.count
    }
    
    func collectionView(_ collectionView: UICollectionView,
                        layout collectionViewLayout: UICollectionViewLayout,
                        sizeForItemAtIndexPath indexPath: IndexPath) -> CGSize {
        return CGSize(width: UIScreen.main.bounds.size.width, height: UIScreen.main.bounds.size.height)
    }
    
    
    func collectionView(_ collectionView: UICollectionView,
                        cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: CellIdentifier, for: indexPath)
        if let cell = cell as? JCMessageImageCollectionViewCell {
            if isMessageType {
                cell.setMessage(imageMessages[indexPath.row])
            } else {
                cell.setImage(image: imageArr[indexPath.row])
            }
            
            cell.delegate = self
        }
        return cell
    }
    
    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        dismiss(animated: true, completion: nil)
    }
}

extension JCImageBrowserViewController: JCImageBrowserCellDelegate {
    func singleTap() {
        dismiss(animated: true, completion: nil)
    }
    
    func longTap(tableviewCell cell: JCMessageImageCollectionViewCell) {
        selectImage = cell.messageImage.image
        let actionSheet = UIAlertAction(title: "保存到手机", style: .default, handler: { (action) in
            self.view.becomeFirstResponder()
            if let image = self.selectImage {
                UIImageWriteToSavedPhotosAlbum(image, self, #selector(self.image(image:didFinishSavingWithError:contextInfo:)), nil)
            }
        })
        self.showSheetAction(title: nil, message: nil, actions: [actionSheet])
        
        SAIInputBarLoad()
    }
    
    @objc func image(image: UIImage, didFinishSavingWithError error: NSError?, contextInfo:UnsafeRawPointer){
        if error == nil {
            MBProgressHUD_JChat.show(text: "保存成功", view: view)
        } else {
            MBProgressHUD_JChat.show(text: "保存失败，请重试", view: view)
        }
    }
}