platform-ios/RainbowPlanet/RainbowPlanet/Modules/SearchModule/Search/View/SearchView.swift

//
//  SearchView.swift
//  RainbowPlanet
//
//  Created by 南鑫林 on 2019/4/23.
//  Copyright © 2019 南鑫林. All rights reserved.
//

import UIKit

class SearchView: BaseView {
    
    typealias SearchCollectionViewDidSelectBlock = (_ indexPath: IndexPath) -> Void
    var searchCollectionViewDidSelectBlock : SearchCollectionViewDidSelectBlock?
    var searchHistoryArray = Array<String>()
    override func setupViews() {
        addSubview(collectionView)

        setupData()
    }
    
    override func setupLayouts() {
        collectionView.snp.makeConstraints { (make) in
            make.edges.equalToSuperview()
        }
    }
    
    override func setupData() {
        
        let emptyView = DIYEmptyView.empty(withImageStr: nil, titleStr: nil, detailStr: "没有历史搜索记录")
        emptyView!.contentViewY = kScaleValue(value: 60)
        collectionView.ly_emptyView = emptyView
        collectionView.ly_startLoading()
        
        guard UserDefaults.standard.array(forKey: "SearchHistoryArray")?.isEmpty ?? true else {
            searchHistoryArray = UserDefaults.standard.array(forKey: "SearchHistoryArray") as! [String]
            collectionView.reloadData()
            collectionView.ly_endLoading()
            return
        }
    }
    
    
    //MARK: - lazy
    private lazy var collectionView: UICollectionView = {
        let collectionView = UICollectionView.init(frame: CGRect.zero, collectionViewLayout: collectionViewLayout)
        collectionView.backgroundColor = UIColor.white
        collectionView.dataSource = self
        collectionView.delegate = self
        return collectionView
    }()
    
    private lazy var collectionViewLayout: UICollectionViewLeftAlignedLayout = {
        let collectionViewLayout = UICollectionViewLeftAlignedLayout.init()
        collectionViewLayout.minimumLineSpacing = 10
        collectionViewLayout.minimumInteritemSpacing =  10
        collectionViewLayout.sectionInset = UIEdgeInsets(top: 10, left: 14, bottom: 10, right: 14)
        collectionViewLayout.scrollDirection = UICollectionView.ScrollDirection.vertical
        collectionViewLayout.estimatedItemSize = CGSize(width: ((kScreenWidth - 28) - 4*10)/5, height: 28)
        return collectionViewLayout
    }()
    

}

extension SearchView : UICollectionViewDelegateFlowLayout ,UICollectionViewDataSource {
    func numberOfSections(in collectionView: UICollectionView) -> Int {
        return 1
    }
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return searchHistoryArray.prefix(10).count
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = SearchCollectionViewCell.cellWith(collectionView: collectionView, indexPath: indexPath)
        cell.hotArray = searchHistoryArray
        return cell
    }
    
    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        if self.searchCollectionViewDidSelectBlock != nil {
            self.searchCollectionViewDidSelectBlock!(indexPath)
        }
    }
    
    // 返回HeadView的宽高
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForHeaderInSection section: Int) -> CGSize {
        return CGSize(width: kScreenWidth, height: 41)
        
    }
    
    func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {
        if kind == UICollectionView.elementKindSectionHeader
        {
            let searchHeaderCollectionReusableView = SearchHeaderCollectionReusableView.headerWith(collectionView: collectionView, kind: UICollectionView.elementKindSectionHeader, indexPath: indexPath)
            searchHeaderCollectionReusableView.deleteButtonBlock = {
                 [weak self] in
                UserDefaults.standard.removeObject(forKey: "SearchHistoryArray")
                self?.searchHistoryArray.removeAll()
                collectionView.reloadData()
            }
            return searchHeaderCollectionReusableView
        }else {
            return UICollectionReusableView()
        }
    }
    
}