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

import UIKit

class MPPositive_CustomTabBarView: UIView {
    ///背景图片
    private lazy var bgImageView:UIImageView = {
        let bgImageView:UIImageView = .init(image: .init(named: "TabBar'bg"))
        bgImageView.contentMode = .scaleAspectFill
        bgImageView.layer.masksToBounds = true
        bgImageView.layer.cornerRadius = 24*width
        bgImageView.layer.maskedCorners = [.layerMinXMinYCorner,.layerMaxXMinYCorner]
        return bgImageView
    }()
    ///items
    private lazy var tabBarItems:[MPPositive_CustomTabBarItem] = {
        var tabBarItems:[MPPositive_CustomTabBarItem] = []
        for index in 0..<titles.count {
            let itemView:MPPositive_CustomTabBarItem = .init(frame: .init(x: 0, y: 0, width: 36*width, height: 36*width))
            itemView.tag = index
            itemView.title = titles[index]
            itemView.isUserInteractionEnabled = true
            itemView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(switchActionClick(_ :))))
            tabBarItems.append(itemView)
        }
        return tabBarItems
    }()
    ///titles
    private lazy var titles:[String] = ["B_Home","B_Seach","B_Mine"]
    ///当前选中itemIndex
    private lazy var selectedItemIndex:Int = 0
    override init(frame: CGRect) {
        super.init(frame: frame)
        confirgue()
    }
    
    required init?(coder: NSCoder) {
        super.init(coder: coder)
    }
    //配置
    private func confirgue() {
        backgroundColor = .clear
        //超出部分不切除
        layer.masksToBounds = false
        //添加背景
        addSubview(bgImageView)
        bgImageView.snp.makeConstraints { make in
            make.left.top.right.bottom.equalToSuperview()
        }
        //添加ItemsView
        tabBarItems.forEach { item in
            addSubview(item)
            item.snp.makeConstraints { make in
                make.centerY.equalToSuperview()
                make.width.height.equalTo(36*width)
                make.centerX.equalToSuperview().multipliedBy(0.45 + 0.55*Double(item.tag))
            }
        }
        //默认首位item处于选中状态
        tabBarItems[0].isSelected = true
    }
    
    //点击事件
    @objc private func switchActionClick(_ sender:UITapGestureRecognizer) {
        endEditing(true)
        let tag = sender.view?.tag ?? 0
        //根据tag值传送
        guard selectedItemIndex != tag else {
            //无效点击
            return
        }
        tabBarItems.forEach { item in
            item.isSelected = item.tag == tag
        }
        selectedItemIndex = tag
        //发送页面切换通知
        NotificationCenter.notificationKey.post(notificationName: .switch_tabBarItem, object: tag)
    }
}