Lanu_iOS/Lanu/Common/Views/Menu/LNCommonAlertView.swift

//
//  LNCommonAlertView.swift
//  Lanu
//
//  Created by OneeChan on 2025/12/12.
//

import Foundation
import UIKit
import SnapKit


extension LNCommonAlertView {
    static func showCommonDeleteAlert(handler: (() -> Void)?) {
        let alert = LNCommonAlertView()
        alert.titleLabel.text = .init(key: "A00308")
        alert.showConfirm {
            handler?()
        }
        alert.showCancel()
        alert.popup()
    }
}

class LNCommonAlertView: UIView {
    private let background = UIView()
    private let container = UIView()
    private let closeButton = UIButton()
    var showCloseButton = true {
        didSet {
            closeButton.isHidden = !showCloseButton
        }
    }
    
    private let miniScale = 0.01
    private let animateDuration = 0.15
    
    private let textViews = UIStackView()
    private let messageView = UIStackView()
    private let buttonViews = UIStackView()
    
    let titleLabel = UILabel()
    let messageLabel = UILabel()
    
    var touchOutsideCancel = true
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        setupViews()
    }
    
    func showConfirm(_ title: String = .init(key: "A00002"),
                     autoDismiss: Bool = true,
                     handler: @escaping () -> Void) {
        let button = buildConfirmButton()
        button.setTitle(title, for: .normal)
        button.addAction(UIAction(handler: { [weak self] _ in
            guard let self else { return }
            if autoDismiss {
                dismiss()
            }
            handler()
        }), for: .touchUpInside)
        buttonViews.insertArrangedSubview(button, at: 0)
    }
    
    func showCancel(_ title: String = .init(key: "A00003"),
                    autoDismiss: Bool = true,
                    handler: (() -> Void)? = nil) {
        let button = buildCancelButton()
        button.setTitle(title, for: .normal)
        button.addAction(UIAction(handler: { [weak self] _ in
            guard let self else { return }
            if autoDismiss {
                dismiss()
            }
            handler?()
        }), for: .touchUpInside)
        buttonViews.addArrangedSubview(button)
    }
    
    func showCustomAction(_ view: UIView) {
        buttonViews.addArrangedSubview(view)
    }
    
    func showCustomMessage(_ view: UIView) {
        messageView.addArrangedSubview(view)
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

extension LNCommonAlertView {
    func popup(_ holder: UIView? = nil) {
        let parentView: UIView? = if let window = holder as? UIWindow {
            window
        } else if let view = holder?.viewController?.view {
            view
        } else if let window = UIView.appKeyWindow {
            window
        } else {
            nil
        }
        guard let parentView else { return }
        parentView.addSubview(self)
        frame = parentView.bounds
        
        titleLabel.isHidden = titleLabel.text?.isEmpty != false
        messageLabel.isHidden = messageLabel.text?.isEmpty != false
        messageView.isHidden = messageLabel.isHidden
        
        layoutIfNeeded()
        
        container.transform = .init(scaleX: miniScale, y: miniScale)
        UIView.animate(withDuration: animateDuration, delay: 0,
                       options: .curveEaseInOut)
        { [weak self] in
            guard let self else { return }
            container.transform = .identity
        }
    }
    
    func dismiss() {
        UIView.animate(withDuration: animateDuration, delay: 0,
                       options: .curveEaseInOut)
        { [weak self] in
            guard let self else { return }
            container.transform = .init(scaleX: miniScale, y: miniScale)
        } completion: { [weak self] _ in
            guard let self else { return }
            removeFromSuperview()
        }
    }
}

extension LNCommonAlertView {
    private func setupViews() {
        background.backgroundColor = .black.withAlphaComponent(0.4)
        background.onTap { [weak self] in
            guard let self else { return }
            guard touchOutsideCancel else { return }
            dismiss()
        }
        addSubview(background)
        background.snp.makeConstraints { make in
            make.edges.equalToSuperview()
        }
        
        container.backgroundColor = .fill
        container.layer.cornerRadius = 20
        addSubview(container)
        container.snp.makeConstraints { make in
            make.center.equalToSuperview()
            make.width.equalToSuperview().multipliedBy(0.8)
        }
        
        closeButton.setImage(.init(systemName: "xmark"), for: .normal)
        closeButton.tintColor = .text_2
        closeButton.addAction(UIAction(handler: { [weak self] _ in
            guard let self else { return }
            dismiss()
        }), for: .touchUpInside)
        container.addSubview(closeButton)
        closeButton.snp.makeConstraints { make in
            make.top.equalToSuperview().offset(10)
            make.trailing.equalToSuperview().offset(-10)
            make.width.height.equalTo(24)
        }
        
        textViews.axis = .vertical
        textViews.spacing = 10
        container.addSubview(textViews)
        textViews.snp.makeConstraints { make in
            make.horizontalEdges.equalToSuperview().inset(24)
            make.top.equalToSuperview().offset(30)
        }
        
        titleLabel.font = .heading_h3
        titleLabel.textColor = .text_4
        titleLabel.textAlignment = .center
        titleLabel.numberOfLines = 0
        textViews.addArrangedSubview(titleLabel)
        
        messageView.axis = .vertical
        messageView.spacing = 6
        textViews.addArrangedSubview(messageView)
        
        messageLabel.font = .body_m
        messageLabel.textColor = .text_4
        messageLabel.textAlignment = .center
        messageLabel.numberOfLines = 0
        messageView.addArrangedSubview(messageLabel)
        
        buttonViews.axis = .vertical
        buttonViews.spacing = 16
        container.addSubview(buttonViews)
        buttonViews.snp.makeConstraints { make in
            make.horizontalEdges.equalToSuperview().inset(50)
            make.top.equalTo(textViews.snp.bottom).offset(16)
            make.bottom.equalToSuperview().offset(-30)
        }
    }
    
    private func buildConfirmButton() -> UIButton {
        let button = UIButton()
        button.setBackgroundImage(.primary_8, for: .normal)
        button.setTitleColor(.text_1, for: .normal)
        button.titleLabel?.font = .heading_h4
        button.layer.cornerRadius = 18
        button.clipsToBounds = true
        button.snp.makeConstraints { make in
            make.height.equalTo(36)
        }
        
        return button
    }
    
    private func buildCancelButton() -> UIButton {
        let button = UIButton()
        button.setTitleColor(.text_4, for: .normal)
        button.titleLabel?.font = .body_m
        button.layer.cornerRadius = 18
        button.layer.borderWidth = 1
        button.layer.borderColor = UIColor.text_3.cgColor
        button.clipsToBounds = true
        button.snp.makeConstraints { make in
            make.height.equalTo(36)
        }
        
        return button
    }
}

#if DEBUG

import SwiftUI

struct LNCommonAlertViewPreview: UIViewRepresentable {
    func makeUIView(context: Context) -> some UIView {
        let container = UIView()
        container.backgroundColor = .lightGray
        
        let button = UIButton()
        button.backgroundColor = .red
        button.addAction(UIAction(handler: { [weak container] _ in
            guard let container else { return }
            
            let view = LNCommonAlertView()
            view.popup(container)
            
        }), for: .touchUpInside)
        container.addSubview(button)
        button.snp.makeConstraints { make in
            make.center.equalToSuperview()
            make.width.height.equalTo(50)
        }
        
        return container
    }
    
    func updateUIView(_ uiView: UIViewType, context: Context) { }
}

#Preview(body: {
    LNCommonAlertViewPreview()
})
#endif