//
//  MPPositive_SearchViewController.swift
//  MusicPlayer
//
//  Created by Mr.Zhou on 2024/4/19.
//

import UIKit

class MPPositive_SearchViewController: MPPositive_BaseViewController {
    //背景图片
    private lazy var bgImageView:UIImageView = {
        let imageView:UIImageView = .init(image: .init(named: "B_Home_BG'bg"))
        imageView.contentMode = .scaleAspectFill
        return imageView
    }()
    private lazy var collectionView:UICollectionView = {
        let layout = MPPositive_TagFlowLayout()
        layout.delegate = self
        let collectionView:UICollectionView = .init(frame: .init(x: 0, y: 0, width: screen_Width, height: screen_Height), collectionViewLayout: layout)
        collectionView.showsVerticalScrollIndicator = false
        collectionView.showsHorizontalScrollIndicator = false
        collectionView.backgroundColor = .clear
        collectionView.dataSource = self
        collectionView.delegate = self
        collectionView.register(MPPositive_SearchTagCollectionViewCell.self, forCellWithReuseIdentifier: MPPositive_SearchTagCollectionViewCellID)
        return collectionView
    }()
    private let MPPositive_SearchTagCollectionViewCellID = "MPPositive_SearchTagCollectionViewCell"
    //历史标签
    private lazy var historyLabel:UILabel = createLabel("History", font: .systemFont(ofSize: 14*width, weight: .regular), textColor: .init(hex: "#666666"), textAlignment: .left)
    //删除按钮
    private lazy var deleteBtn:UIButton = {
        let btn:UIButton = .init()
        btn.setBackgroundImage(UIImage(named: "Tag_Delete'logo"), for: .normal)
        btn.addTarget(self, action: #selector(deleteClick(_ :)), for: .touchUpInside)
        return btn
    }()
    override func viewDidLoad() {
        super.viewDidLoad()
        setTitle("")
        configure()
        //加载搜索原生广告
        MP_AdMobManager.shared.configureSreachNativeAd(rootController: self)
        MP_AdMobManager.shared.loadSearchNativeAd()
    }
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        MP_AnalyticsManager.shared.search_pvAction()
        collectionView.reloadData()
    }
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        
    }
    //配置
    private func configure() {
        let searchView = createSearchView()
        navView.addSubview(searchView)
        searchView.snp.makeConstraints { make in
            make.width.equalTo(339*width)
            make.height.equalTo(32*width)
            make.center.equalToSuperview()
        }
        view.addSubview(bgImageView)
        bgImageView.snp.makeConstraints { make in
            make.top.right.left.equalToSuperview()
            make.height.equalTo(981*width)
        }
        view.addSubview(deleteBtn)
        deleteBtn.snp.makeConstraints { make in
            make.width.height.equalTo(24*width)
            make.right.equalToSuperview().offset(-18*width)
            make.top.equalTo(navView.snp.bottom).offset(24*width)
        }
        view.addSubview(historyLabel)
        historyLabel.snp.makeConstraints { make in
            make.centerY.equalTo(deleteBtn)
            make.left.equalToSuperview().offset(18*width)
        }
        view.addSubview(collectionView)
        collectionView.snp.makeConstraints { make in
            make.left.right.equalToSuperview()
            make.top.equalTo(deleteBtn.snp.bottom).offset(6*width)
            make.height.equalTo(130*width)
        }
    }
    //生成一个顶部搜索框
    private func createSearchView() -> UIView{
        let searchView:UIView = UIView()
        searchView.backgroundColor = .init(hex: "#212121")
        searchView.isUserInteractionEnabled = true
        searchView.layer.masksToBounds = true
        searchView.layer.cornerRadius = 16*width
        //添加一个icon
        let iconImageView = UIImageView(image: .init(named: "Search_ICON'logo"))
        searchView.addSubview(iconImageView)
        iconImageView.snp.makeConstraints { make in
            make.height.width.equalTo(16*width)
            make.left.equalToSuperview().offset(16*width)
            make.centerY.equalToSuperview()
        }
        let label = createLabel("Search songs,artists,playlists", font: .systemFont(ofSize: 14*width, weight: .regular), textColor: .init(hex: "#666666"), textAlignment: .left)
        searchView.addSubview(label)
        label.snp.makeConstraints { make in
            make.left.equalTo(iconImageView.snp.right).offset(8*width)
            make.centerY.equalToSuperview()
        }
        searchView.isUserInteractionEnabled = true
        searchView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(searchClick(_:))))
        return searchView
    }
    //前往搜索结果页
    @objc fileprivate func searchClick(_ sender:UITapGestureRecognizer) {
        let resultVC = MPPositive_SearchResultShowViewController()
        navigationController?.pushViewController(resultVC, animated: false)
    }
    //删除按钮
    @objc private func deleteClick(_ sender:UIButton) {
        //移除所有
        MPPositive_SearchTagModel.fetchAll().forEach { item in
            MPPositive_SearchTagModel.delete(item)
        }
        MPPositive_LoadCoreModel.shared.reloadSearchTags {
            [weak self] in
            guard let self = self else {return}
            collectionView.reloadData()
        }
    }
}
//MARK: - collectionView
extension MPPositive_SearchViewController: UICollectionViewDataSource, UICollectionViewDelegate, MPPositive_TagLayoutDelegate {
    
    func waterFlowLayout(_ layout: MPPositive_TagFlowLayout, indexPath: IndexPath) -> CGFloat {
        let text = MPPositive_LoadCoreModel.shared.searchTags[indexPath.row].text ?? ""
        let textWidth = text.textAutoWidth(height: 11.5 * width, font: .systemFont(ofSize: 12 * width, weight: .medium)) + (43 * width)
        return textWidth
    }
    
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return MPPositive_LoadCoreModel.shared.searchTags.count > 10 ? 10:MPPositive_LoadCoreModel.shared.searchTags.count
    }
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: MPPositive_SearchTagCollectionViewCellID, for: indexPath) as! MPPositive_SearchTagCollectionViewCell
        cell.setText(MPPositive_LoadCoreModel.shared.searchTags[indexPath.row].text)
        return cell
    }
    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        let text = MPPositive_LoadCoreModel.shared.searchTags[indexPath.row].text ?? ""
        let resultVC = MPPositive_SearchResultShowViewController(text)
        navigationController?.pushViewController(resultVC, animated: false)
    }
}
//MARK: - 宽度代理
protocol MPPositive_TagLayoutDelegate {
    func waterFlowLayout(_ layout:MPPositive_TagFlowLayout,indexPath:IndexPath) -> CGFloat
}
//MARK: - 重写布局
///标签layout
class MPPositive_TagFlowLayout: UICollectionViewFlowLayout {
    //固定行高
    var rowHeight:CGFloat = 22 * width
    //宽度获取代理
    var delegate:MPPositive_TagLayoutDelegate?
    //x值数组
    var originxArray:[CGFloat]!
    //y值数组
    var originyArray:[CGFloat]!
    override init() {
        super.init()
        //列间距
        minimumInteritemSpacing = 8 * width
        //行间距
        minimumLineSpacing = 8 * width
        //内边距
        sectionInset = .init(top: 5 * width, left: 18 * width, bottom: 5 * width, right: 18 * width)
        scrollDirection = .vertical
        //初始化数组
        originxArray = [CGFloat]()
        originyArray = [CGFloat]()
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    //MARK: - 重写父类方法，实现瀑布流布局
    //当尺寸发生变化时，刷新布局
    override func shouldInvalidateLayout(forBoundsChange newBounds: CGRect) -> Bool {
        return true
    }
    override func prepare() {
        super.prepare()
    }
    //处理所有item的layoutAttributes
    override func layoutAttributesForElements(in rect: CGRect) -> [UICollectionViewLayoutAttributes]? {
        let array = super.layoutAttributesForElements(in: rect)
        var mutArray = [UICollectionViewLayoutAttributes]()
        array?.forEach({ (attrs) in
            let theAttrs = layoutAttributesForItem(at: attrs.indexPath)
            mutArray.append(theAttrs!)
        })
        return mutArray
    }
    //处理单个item的layoutAttributes
    override func layoutAttributesForItem(at indexPath: IndexPath) -> UICollectionViewLayoutAttributes? {
        //起始x值
        var x = sectionInset.left
        var y = sectionInset.top
        //判断获得前一个cell的x和y
        let preRow = indexPath.row - 1
        if preRow >= 0 {
            //不是第一个cell
            if originyArray.count > preRow {
                //更新x和y值
                x = originxArray[preRow]
                y = originyArray[preRow]
            }
            let preIndexPath = IndexPath(item: preRow, section: indexPath.section)
            //计算宽度
            let preWidth = delegate?.waterFlowLayout(self, indexPath: preIndexPath)
            x += preWidth! + minimumInteritemSpacing
        }
        var currentWidth = delegate?.waterFlowLayout(self, indexPath: indexPath)
        //保证每一个cell不超过最大宽度
        currentWidth = min(currentWidth!, collectionView!.frame.size.width - sectionInset.left - sectionInset.right)
        if x + currentWidth! > collectionView!.frame.size.width - sectionInset.right {
            //超出范围，换行
            x = self.sectionInset.left
            y += rowHeight + minimumLineSpacing
        }
        //创建属性
        let attrs = UICollectionViewLayoutAttributes.init(forCellWith: indexPath)
        attrs.frame = CGRect(x: x, y: y, width: currentWidth!, height: rowHeight)
        originxArray.insert(x, at: indexPath.row)
        originyArray.insert(y, at: indexPath.row)
        return attrs
    }
}