//
//  MPPositive_SearchHistoryView.swift
//  relax.offline.mp3.music
//
//  Created by Mr.Zhou on 2024/8/7.
//

import UIKit
///搜索历史
class MPPositive_SearchHistoryView: UIView {
    //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
    }()
    //搜索历史展示
    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"
    //历史数据
    private var historys:[MPPositive_SearchTagModel] = []
    var selectedTagBlock:((String) -> Void)?
    override init(frame: CGRect) {
        super.init(frame: frame)
        confirgue()
    }
    private func confirgue() {
        backgroundColor = .clear
        //添加控件
        addSubview(deleteBtn)
        deleteBtn.snp.makeConstraints { make in
            make.width.height.equalTo(24*width)
            make.right.equalToSuperview().offset(-18*width)
            make.top.equalToSuperview().offset(24*width)
        }
        addSubview(historyLabel)
        historyLabel.snp.makeConstraints { make in
            make.centerY.equalTo(deleteBtn)
            make.left.equalToSuperview().offset(18*width)
        }
        addSubview(collectionView)
        collectionView.snp.makeConstraints { make in
            make.top.equalTo(deleteBtn.snp.bottom).offset(6*width)
            make.left.bottom.right.equalToSuperview()
        }
    }
    //更新搜索历史数据
    func reloadHistory() {
        MPPositive_LoadCoreModel.shared.reloadSearchTags {
            [weak self] in
            guard let self = self else {return}
            historys = MPPositive_LoadCoreModel.shared.searchTags
            collectionView.reloadData()
        }
    }
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    //删除按钮
    @objc private func deleteClick(_ sender:UIButton) {
        //移除所有
        historys.forEach { item in
            MPPositive_SearchTagModel.delete(item)
        }
        guard let layout = collectionView.collectionViewLayout as? MPPositive_TagFlowLayout else {return}
        layout.originxArray.removeAll()
        layout.originyArray.removeAll()
        layout.layoutAttributeds.removeAll()
        MPPositive_LoadCoreModel.shared.reloadSearchTags {
            [weak self] in
            guard let self = self else {return}
            historys = MPPositive_LoadCoreModel.shared.searchTags
            collectionView.reloadData()
        }
    }
}
//MARK: - collectionView
extension MPPositive_SearchHistoryView: UICollectionViewDataSource, UICollectionViewDelegate, MPPositive_TagLayoutDelegate {
    func waterFlowLayout(_ layout: MPPositive_TagFlowLayout, indexPath: IndexPath) -> CGFloat {
        if indexPath.row < historys.count {
            let text = historys[indexPath.row].text ?? ""
            let textWidth = text.textAutoWidth(height: 11.5 * width, font: .systemFont(ofSize: 12 * width, weight: .medium)) + (43 * width)
            return textWidth
        }else {
            return 0
        }
    }
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return historys.count > 10 ? 10:historys.count
    }
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: MPPositive_SearchTagCollectionViewCellID, for: indexPath) as! MPPositive_SearchTagCollectionViewCell
        cell.setText(historys[indexPath.row].text ?? "")
        return cell
    }
    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        MPPositive_Debouncer.shared.call {
            [weak self] in
            guard let self = self else {return}
            if let text = historys[indexPath.row].text, let block = selectedTagBlock {
                block(text)
            }
        }
    }
}
//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]!
    //记录的布局值
    var layoutAttributeds:[UICollectionViewLayoutAttributes] = []
    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
            if let theAttrs = layoutAttributesForItem(at: attrs.indexPath) {
                mutArray.append(theAttrs)
            }
        })
        layoutAttributeds = mutArray
        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
    }
}