MiMO_iOS/MiMoLive/Classes/Live/View/LiveingView/GiftListView/MOSendGiftView.swift

//
//  MOSendGiftView.swift
//  MiMoLive
//
//  Created by OneeChan on 2025/9/3.
//

import Foundation
import UIKit
import Combine
import SnapKit

protocol MOSendGiftViewDelegate {
    func sendGiftViewDidSelectNum(view: MOSendGiftView, num: Int, isCustom: Bool)
    func sendGiftViewClickSend(view: MOSendGiftView)
    func sendGiftViewClickCustom(view: MOSendGiftView)
}

class MOSendGiftView: UIView {
    private static let nums = [1, 10, 99, 999]
    
    private var curNum = 1
    
    private var customNum: Int? = nil {
        didSet {
            if let customNum {
                self.customLabel?.text = "\(customNum)"
            }
        }
    }
    
    private var selectedViewTag: Int? = nil
    private var numButtons: [UIView] = []
    
    private var customLabel: UILabel?
    private var selectedViewBg: UIView?
    private var sendButton: UIView?
    
    public var delegate: MOSendGiftViewDelegate?
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        setupViews()
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    func updateGiftNum(_ num: Int) {
        guard let index = Self.nums.firstIndex(of: num) else { return }
        guard let view = numButtons.first(where: { $0.tag == index }) else { return }
        curNum = num
        updateSelectedView(view)
    }
    
    func curGiftNum() -> Int {
        return curNum
    }
    
    func enableGiftNum(_ enable: Bool) {
        subviews.forEach { view in
            if view != sendButton {
                view.isHidden = !enable
            }
        }
        if !enable {
            curNum = 1
        }
    }
    
    func updateCustomNum(_ num: Int) {
        customNum = num
        curNum = num
        guard let view = numButtons.first(where: { $0.tag == Self.nums.count }) else { return }
        updateSelectedView(view)
    }
}

// MARK: UI 事件
extension MOSendGiftView {
    @objc
    private func handleGiftNumClick(_ sender: UIButton) {
        let index = sender.tag
        guard index < Self.nums.count else { return }
        let num = Self.nums[index]
        self.curNum = num
        self.updateSelectedView(sender)
        self.delegate?.sendGiftViewDidSelectNum(view: self, num: num, isCustom: false)
    }
    
    @objc
    private func handleCustomClick(_ sender: UIButton) {
        if let customNum, sender.tag != self.selectedViewTag {
            self.curNum = customNum
            updateSelectedView(sender)
            self.delegate?.sendGiftViewDidSelectNum(view: self, num: customNum, isCustom: true)
            return
        }
        
        self.delegate?.sendGiftViewClickCustom(view: self)
    }
    
    @objc
    private func handleSendClick() {
        self.delegate?.sendGiftViewClickSend(view: self)
    }
    
    private func updateSelectedView(_ view: UIView) {
        self.selectedViewTag = view.tag
        self.selectedViewBg?.snp.remakeConstraints({ make in
            make.centerX.width.equalTo(view)
            make.centerY.height.equalToSuperview()
        })
        UIView.animate(withDuration: 0.3) {
            self.layoutIfNeeded()
        }
    }
}

// MARK: UI 视图构建
extension MOSendGiftView {
    override func layoutSubviews() {
        super.layoutSubviews()
        
        selectedViewBg?.layer.sublayers?.forEach({ layer in
            if layer is CAGradientLayer {
                layer.frame = selectedViewBg!.bounds
            }
        })
        sendButton?.layer.sublayers?.forEach({ layer in
            if layer is CAGradientLayer {
                layer.frame = sendButton!.bounds
            }
        })
    }
    
    // UI 组装
    private func setupViews() {
        let container = UIView()
        container.backgroundColor = .white.withAlphaComponent(0.16)
        container.layer.cornerRadius = 10
        addSubview(container)
        container.snp.makeConstraints { make in
            make.edges.equalToSuperview()
        }
        
        let selectedBg = buildSelectedBgView()
        addSubview(selectedBg)
        self.selectedViewBg = selectedBg
        
        var leading: UIView = container
        for (index, num) in Self.nums.enumerated() {
            let button = buildGiftNumView(index, num)
            addSubview(button)
            button.snp.makeConstraints { make in
                make.centerY.equalToSuperview()
                if leading == container {
                    make.leading.equalToSuperview()
                } else {
                    make.leading.equalTo(leading.snp.trailing)
                    make.width.equalTo(leading)
                }
            }
            leading = button
            if index == 0 {
                updateSelectedView(button)
            }
        }
        
        let custom = buildCustomView()
        addSubview(custom)
        custom.snp.makeConstraints { make in
            make.centerY.equalToSuperview()
            make.leading.equalTo(leading.snp.trailing)
        }
        
        let send = buildSendButton()
        addSubview(send)
        send.snp.makeConstraints { make in
            make.top.bottom.trailing.equalToSuperview()
            make.leading.equalTo(custom.snp.trailing)
        }
        sendButton = send
    }
    
    // 数量选中的背景
    private func buildSelectedBgView() -> UIView {
        let container = UIView()
        
        let graLayer = CAGradientLayer()
        graLayer.startPoint = CGPoint(x: 0, y: 0.5)
        graLayer.endPoint = CGPoint(x: 1, y: 0.5)
        graLayer.colors = [UIColor(red: 255/255.0, green: 77/255.0, blue: 166/255.0, alpha: 1).cgColor,
                           UIColor(red: 67/255.0, green: 99/255.0, blue: 255/255.0, alpha: 1).cgColor];
        graLayer.locations = [0, 1.0]
        container.layer.insertSublayer(graLayer, at: 0)
        container.layer.cornerRadius = 10
        container.layer.masksToBounds = true
        
        let cover = UIView()
        cover.backgroundColor = .black.withAlphaComponent(0.4)
        cover.layer.cornerRadius = 10
        container.addSubview(cover)
        cover.snp.makeConstraints { make in
            make.edges.equalToSuperview().inset(0.5)
        }
        
        return container
    }
    
    // 每个数量的视图
    private func buildGiftNumView(_ index: Int, _ num: Int) -> UIView {
        let button = UIButton()
        button.tag = index
        button.setTitle("\(num)", for: .normal)
        button.titleLabel?.font = MOTextTools.mediumFont(12.0)
        button.addTarget(self, action: #selector(handleGiftNumClick), for: .touchUpInside)
        
        numButtons.append(button)
        
        return button
    }
    
    // 自定义数量视图
    private func buildCustomView() -> UIView {
        let custom = UIButton()
        custom.tag = Self.nums.count
        custom.addTarget(self, action: #selector(handleCustomClick), for: .touchUpInside)
        
        let title = UILabel()
        title.textColor = .white
        title.text = "Cust"
        title.font = MOTextTools.mediumFont(12.0)
        custom.addSubview(title)
        title.snp.makeConstraints { make in
            make.centerY.equalToSuperview()
            make.leading.equalToSuperview().offset(16)
        }
        self.customLabel = title
        
        let ic = UIImageView()
        ic.tintColor = .white
        ic.image = UIImage(named: "icon_create_edit")
        custom.addSubview(ic)
        ic.snp.makeConstraints { make in
            make.centerY.equalToSuperview()
            make.leading.equalTo(title.snp.trailing)
            make.trailing.equalToSuperview().offset(-16)
            make.width.height.equalTo(9)
        }
        
        numButtons.append(custom)
        
        return custom
    }
    
    // 发送按钮
    private func buildSendButton() -> UIView {
        let send = UIButton()
        send.addTarget(self, action: #selector(handleSendClick), for: .touchUpInside)
        send.layer.cornerRadius = 10
        
        let title = UILabel()
        title.text = "Send"
        title.font = MOTextTools.mediumFont(12.0)
        title.textColor = .white
        send.addSubview(title)
        title.snp.makeConstraints { make in
            make.edges.equalToSuperview().inset(UIEdgeInsets(top: 6, left: 16, bottom: 6, right: 16))
        }
        
        let graLayer = CAGradientLayer()
        graLayer.startPoint = CGPoint(x: 0, y: 0.5)
        graLayer.endPoint = CGPoint(x: 1, y: 0.5)
        graLayer.colors = [UIColor(red: 255/255.0, green: 77/255.0, blue: 166/255.0, alpha: 1).cgColor,
                           UIColor(red: 67/255.0, green: 99/255.0, blue: 255/255.0, alpha: 1).cgColor];
        graLayer.locations = [0, 1.0]
        send.layer.insertSublayer(graLayer, at: 0)
        send.layer.cornerRadius = 10
        send.layer.masksToBounds = true
        
        return send
    }
}

//#if DEBUG
//import SwiftUI
//
//struct MOSendGiftViewPreview: UIViewRepresentable {
//    func makeUIView(context: Context) -> some UIView {
//        let container = UIView()
//        container.backgroundColor = .black
//        let view = MOSendGiftView()
//        container.addSubview(view)
//        view.snp.makeConstraints { make in
//            make.center.equalToSuperview()
//            make.leading.trailing.equalToSuperview()
//        }
//        return container
//    }
//    
//    func updateUIView(_ uiView: UIViewType, context: Context) { }
//}
//
//#Preview(body: {
//    ZStack {
//        MOSendGiftViewPreview()
//    }
//})
//
//#endif