//   HomeViewController.swift
//  PaiAi//
//  Created by zhengjianfei on 16/3/28.
//  Copyright © 2016年 FFIB. All rights reserved.
//

import UIKit
import MapKit
import ObjectMapper
import RxSwift
import RxCocoa
import RxDataSources
import ESPullToRefresh

protocol HomeViewControllerDelegate: class {
    func scanQR()
    func createGroup()
    func didSelect(_ item: PhotoItem)
}

final class HomeViewController: UIViewController {

    @IBOutlet weak var scanBtn: UIButton!
    @IBOutlet weak var createBtn: UIButton!
    @IBOutlet weak var scanLabel: UILabel!
    @IBOutlet weak var createLabel: UILabel!
    @IBOutlet weak var collectionView: UICollectionView!
    // MARK: data property
    var homeViewModel = HomeViewModel()
    let disposeBag = DisposeBag()
    
    weak var delegate: HomeViewControllerDelegate?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        navigationItem.backBarButtonItem?.isEnabled = false
        collectionView.register(UINib(nibName: "PhotoCell", bundle: nil),
                                forCellWithReuseIdentifier: "photoCell")

        configureRxDataSource()
        addReloadControl()
        addLoadingControl()
    }
    
    override func viewWillAppear(_ animated: Bool) {
        
        navigationController?.navigationBar.setBackgroundImage(UIImage(named: "标题栏 copy 2"), for: .default)
    }
    
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        guard SharedUserInfo.isLogin else {
            let ctl = UIStoryboard.mainBoard.instantiateController(LoginController.self)
            navigationController?.present(ctl, animated: false, completion: nil)
            return
        }
        
    }
    
    var dataSource: RxCollectionViewSectionedAnimatedDataSource<AnimatableSectionModel<Int, PhotoItem>> {
        return RxCollectionViewSectionedAnimatedDataSource<AnimatableSectionModel<Int, PhotoItem>>(configureCell: { (dataSource, collectionView, indexPath, item) -> UICollectionViewCell in
            let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "photoCell", for: indexPath) as! PhotoCell
            cell.setInfo(item)
            return cell
        })
    }
    
    func configureRxDataSource() {
        collectionView.rx.setDelegate(self).disposed(by: disposeBag)
        
        homeViewModel.isReload.subscribe(onNext: {
            [weak self] _ in
            guard let `self` = self else { return }
            self.collectionView.es.stopPullToRefresh()
        }).disposed(by: disposeBag)
        
        homeViewModel.isloading.subscribe(onNext: {
            [weak self] _ in
            guard let `self` = self else { return }
            self.collectionView.es.stopLoadingMore()
        }).disposed(by: disposeBag)
        
        homeViewModel.homePhotoContents
            .bind(to: collectionView.rx.items(dataSource: dataSource))
            .disposed(by: disposeBag)
        
        collectionView.rx.willDisplayCell
            .subscribe(onNext: { [unowned self] in self.homeViewModel.preload(indexPath: $0.at) })
            .disposed(by: disposeBag)
        
        collectionView.rx.modelSelected(PhotoItem.self)
            .subscribe(onNext: { [unowned self] in self.delegate?.didSelect($0) })
            .disposed(by: disposeBag)
    
        collectionView.collectionViewLayout = WaterfallFlowLayout()
    }
    
    func addReloadControl() {
        collectionView.es.addPullToRefresh {
            [unowned self] in
            self.homeViewModel.reload()
        }
        collectionView.es.startPullToRefresh()
    }
    
    func addLoadingControl() {
        collectionView.es.addInfiniteScrolling {}
    }

    @IBAction func createGroupAction(_ sender: UIButton) {
        self.delegate?.createGroup()
    }
   
    @IBAction func scanAction(_ sender: UIButton) {
        self.delegate?.scanQR()
    }
}

extension HomeViewController: UICollectionViewDelegateFlowLayout {
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        return homeViewModel.layoutSizeForItem(indexPath)
    }
}