//
//  DLToast.swift
//  DLSDK
//
//  Created by osell on 2023/8/18.
//

import UIKit

// MARK: - DLToastConfig
public class DLToastConfig {

    fileprivate static var tag = NSStringFromClass(DLToastView.self).hash
    
    public enum Style {
    case none
    case loading
    case progress
    }
    /// 背景图层颜色
    var bgColor: UIColor = .clear
    /// 容器背景色
    var containerBgColor: UIColor = .black.withAlphaComponent(0.7)
    /// 容器圆角
    var containerRadius: CGFloat = 12.0
    /// 文字颜色
    var textColor: UIColor = .white
    /// 文字大小
    var textFont: UIFont = .systemFont(ofSize: 16, weight: .medium)
    /// 图标大小
    var iconSize: CGSize = CGSize(width: 34, height: 34)
    
    public init() {}
}

// MARK: - ToastImageView
class ToastImageView: UIImageView {
    private var displayLink: CADisplayLink?
    private var rotationAngle: CGFloat = 0.0

    func startAnimation() {
        displayLink = CADisplayLink(target: self, selector: #selector(handleDisplayLink(_:)))
        displayLink?.add(to: .current, forMode: .common)
    }

    @objc private func handleDisplayLink(_ displayLink: CADisplayLink) {
        rotationAngle += CGFloat(displayLink.duration) * 2.0 * .pi
        transform = CGAffineTransform(rotationAngle: rotationAngle)
    }
    
    func stopAnimation() {
        displayLink?.remove(from: .current, forMode: .common)
        displayLink?.invalidate()
        displayLink = nil
    }
    
    deinit {
        stopAnimation()
    }
}


// MARK: - DLToastView
class DLToastView: UIView {
    /// 完成后回调
    var completion: (() -> Void)?
    
    /// container
    private lazy var containerView: UIView = {
        let view = UIView()
        view.backgroundColor = config.containerBgColor
        view.setCornerRadius(config.containerRadius)
        view.isUserInteractionEnabled = true
        return view
    }()
    
    /// 图标
    private lazy var iconImageView: ToastImageView = {
        let view = ToastImageView()
        return view
    }()
    
    /// text
    private lazy var textLabel: UILabel = {
        let label = UILabel()
        label.font = config.textFont
        label.textColor = config.textColor
        label.textAlignment = .center
        label.numberOfLines = 0
        return label
    }()
    
    private weak var viewForPresent: UIView?
    private var config: DLToastConfig = DLToastConfig()
    private var style: DLToastConfig.Style = .none
    private var text: String?
    private var iconImage: UIImage?
    private var timer: DispatchSourceTimer?
    
    private override init(frame: CGRect) {
        super.init(frame: .zero)
        setupSubViews()
    }
    
    init(iconImage: UIImage?, text: String?, config: DLToastConfig, style: DLToastConfig.Style) {
        self.iconImage = iconImage
        self.text = text
        self.config = config
        self.style = style
        super.init(frame: .zero)
        setupSubViews()
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    /// 初始化视图布局
    private func setupSubViews() {
        // 视图容器
        addSubview(containerView)
        containerView.layoutChain
            .center()
            .left(48, relation: .greaterThanOrEqual)
            .right(48, relation: .greaterThanOrEqual)
            .top(kNaviHeight, relation: .greaterThanOrEqual)
            .bottom(kNaviHeight, relation: .greaterThanOrEqual)
            .width(100, relation: .greaterThanOrEqual)
        
        // 是否显示文字
        let isShowText = text?.isEmpty == false
        var preView: UIView?
        // 图片
        if let iconImage = iconImage {
            iconImageView.image = iconImage
            
            containerView.addSubview(iconImageView)
            iconImageView.layoutChain
                .centerX()
                .size(config.iconSize)
                .top(isShowText ? 30 : 33)
                .left(33, relation:  isShowText ? .greaterThanOrEqual : .equal)
                .right(33, relation: isShowText ? .greaterThanOrEqual : .equal)
            
            preView = iconImageView
        }
    
        // 文字
        if isShowText {
            textLabel.text = text
            
            containerView.addSubview(textLabel)
            textLabel.layoutChain
                .edgesHorzontal(16)
                .width(112, relation: .greaterThanOrEqual)
            
            if let preView = preView {
                textLabel.layoutChain
                    .topToBottomOfView(preView, offset: 20)
            } else {
                textLabel.layoutChain
                    .top(12)
            }
            
            preView = textLabel
        }
        
        if let preView = preView as? UIImageView {
            preView.layoutChain
                .bottom(33)
        } else if let preView = preView as? UILabel {
            preView.layoutChain
                .bottom(isShowText && iconImage != nil ? 30 : 12)
        }
    }
    
    
    deinit {
        NotificationCenter.default.removeObserver(self)
        if timer != nil {
            timer?.cancel()
            timer = nil
        }
    }
}

extension DLToastView {
    /// 显示Toast
    /// - Parameter view: toast父视图
    func show(in view: UIView) {
        viewForPresent = view
        guard let viewForPresent = viewForPresent else { return }
        backgroundColor = .clear
        isUserInteractionEnabled = style == .loading
        viewForPresent.addSubview(self)
        self.layoutChain
            .edges()
        
        alpha = 0
        sizeToFit()
        containerView.center = .init(x: viewForPresent.frame.midX, y: viewForPresent.frame.midY)
        containerView.transform = transform.scaledBy(x: 0.8, y: 0.8)
        UIView.animate(withDuration: 0.25) {
            self.alpha = 1
            self.containerView.transform = CGAffineTransform.identity
            self.backgroundColor = self.config.bgColor
        }
    
        // loading
        if style == .loading {
            NotificationCenter.default.addObserver(self, selector: #selector(applicationWillResignActive), name: UIApplication.willResignActiveNotification, object: nil)
            NotificationCenter.default.addObserver(self, selector: #selector(applicationDidBecomeActive), name: UIApplication.didBecomeActiveNotification, object: nil)
            // 执行动画
            iconImageView.startAnimation()
        }
        
        // 根据文本内容自动消失
        if style == .none {
            let text = text ?? ""
            var time = Double(text.count) * 0.03 + 1.25
            time = time > 3.0 ? 3.0 : time
            self.dismiss(delay: time, self.completion)
        }
    }
    
    /// 隐藏
    /// - Parameter completion: 完成回调
    func dismiss(delay: TimeInterval = 0, _ completion: (() -> Void)? = nil) {
        // 有文字显示，自动消失
        if timer != nil {
            timer?.cancel()
            timer = nil
        }
        let queue = DispatchQueue(label: "com.toast.timer", qos: .background)
        let timer = DispatchSource.makeTimerSource(queue: queue)
        timer.schedule(deadline: .now() + delay)
        timer.setEventHandler { [weak self] in
            guard let this = self else { return }
            DispatchQueue.main.async {
                UIView.animate(withDuration: 0.25) {
                    this.alpha = 0
                    this.containerView.transform = this.containerView.transform.scaledBy(x: 0.2, y: 0.2)
                } completion: { _ in
                    if this.style == .loading {
                        this.iconImageView.stopAnimation()
                    }
                    this.removeFromSuperview()
                    completion?()
                }
            }
        }
        timer.resume()
        self.timer = timer
    }
    
    @objc func applicationWillResignActive() {
        if style == .loading {
            iconImageView.stopAnimation()
        }
    }
       
    @objc func applicationDidBecomeActive() {
        if style == .loading {
            iconImageView.startAnimation()
        }
    }
}

// MARK: - 通用Toast
public class DLToast {
    
    /// 显示loading
    /// - Parameters:
    ///   - text: 文字
    ///   - view: 在哪个视图上显示，默认在window
    public static func showLoading(text: String? = nil,
                                   in view: UIView? = nil) {
       show(text: text, icon: UIImage(named: "loading"), style: .loading, in: view)
    }
    
    /// 显示成功
    /// - Parameters:
    ///   - text: 文字
    ///   - view: 在哪个视图上显示，默认在window
    ///   - completion: 完成后回调
    public static func showSuccess(text: String? = nil,
                                   in view: UIView? = nil,
                                   completion: (() -> Void)? = nil) {
        show(text: text, icon: UIImage(named: "success"), in: view, completion: completion)
    }
    
    /// 显示错误
    /// - Parameters:
    ///   - text: 文字
    ///   - view: 在哪个视图上显示，默认在window
    ///   - completion: 完成后回调
    public static func showError(text: String? = nil,
                                 in view: UIView? = nil,
                                 completion: (() -> Void)? = nil) {
        show(text: text, icon: UIImage(named: "fail"), in: view, completion: completion)
    }
    
    /// 显示警告信息
    /// - Parameters:
    ///   - text: 文字
    ///   - view: 在哪个视图上显示，默认在window
    ///   - completion: 完成后回调
    public static func showInfo(text: String? = nil,
                                in view: UIView? = nil,
                                completion: (() -> Void)? = nil) {
        show(text: text, icon: UIImage(named: "warning"), in: view, completion: completion)
    }
    
    /// 显示toast
    /// - Parameters:
    ///   - text: 文字
    ///   - icon: 图标
    ///   - config: 配置信息
    ///   - style: 样式
    ///   - view: 在哪个视图上显示，默认在window
    ///   - completion: 完成后回调
    public static func show(text: String? = nil,
                            icon: UIImage? = nil,
                            config: DLToastConfig = DLToastConfig(),
                            style: DLToastConfig.Style = .none,
                            in view: UIView? = nil,
                            completion: (() -> Void)? = nil) {
        DispatchQueue.main.async {
            let superView = view ?? UIApplication.shared.windows.filter({ $0.isKeyWindow }).first
            guard let superView = superView else { return }
            if  let toastView = superView.findSubView(with: DLToastConfig.tag) as? DLToastView {
                toastView.removeFromSuperview()
            }
            let config = config
            config.containerRadius = icon == nil ? 4 : config.containerRadius
            let toastView = DLToastView(iconImage: icon, text: text, config: config, style: style)
            toastView.tag = DLToastConfig.tag
            toastView.completion = completion
            toastView.show(in: superView)
        }
    }
    
    /// 隐藏toast
    /// - Parameters:
    ///   - view: 从哪个视图隐藏
    ///   - completion: 完成回调
    public static func dismiss(for view: UIView? = nil,
                               delay: TimeInterval = 0,
                               completion: (() -> Void)? = nil) {
        DispatchQueue.main.async {
            let superView = view ?? UIApplication.shared.windows.filter({ $0.isKeyWindow }).first
            guard let toastView = superView?.findSubView(with: DLToastConfig.tag) as? DLToastView else {
                completion?()
                return
            }
            toastView.dismiss(delay: delay, completion)
        }
    }
}

// MARK: - UIView + Toast
extension DLWrapper where Base: UIView {
    
    /// 显示loading
    /// - Parameters:
    ///   - text: 文字
    public func showLoading(text: String? = nil) {
        DLToast.showLoading(text: text, in: base)
    }
    
    /// 显示成功
    /// - Parameters:
    ///   - text: 文字
    ///   - view: 在哪个视图上显示，默认在window
    ///   - completion: 完成后回调
    public func showSuccess(text: String? = nil,
                            completion: (() -> Void)? = nil) {
        DLToast.showSuccess(text: text, in: base, completion: completion)
    }
    
    /// 显示错误
    /// - Parameters:
    ///   - text: 文字
    ///   - completion: 完成后回调
    public func showError(text: String? = nil,
                          completion: (() -> Void)? = nil) {
        DLToast.showError(text: text, in: base, completion: completion)
    }
    
    /// 显示警告信息
    /// - Parameters:
    ///   - text: 文字
    ///   - completion: 完成后回调
    public func showInfo(text: String? = nil,
                         completion: (() -> Void)? = nil) {
        DLToast.showInfo(text: text, in: base, completion: completion)
    }
    
    /// 显示toast
    /// - Parameters:
    ///   - text: 文字
    ///   - icon: 图标
    ///   - config: 配置信息
    ///   - style: 样式
    ///   - completion: 完成后回调
    public func show(text: String,
                     icon: UIImage? = nil,
                     config: DLToastConfig = DLToastConfig(),
                     style: DLToastConfig.Style = .none,
                     completion: (() -> Void)? = nil) {
        DLToast.show(text: text, icon: icon, config: config, style: style, in: base, completion: completion)
    }
    
    /// 隐藏toast
    /// - Parameters:
    ///   - completion: 完成回调
    public func dismiss(delay: TimeInterval = 0,
                        completion: (() -> Void)? = nil) {
        DLToast.dismiss(for: base, delay: delay, completion: completion)
    }
}

// MARK: - UIViewController + Toast
extension DLWrapper where Base: UIViewController {
    /// 显示loading
    /// - Parameters:
    ///   - text: 文字
    public func showLoading(text: String? = nil) {
        DLToast.showLoading(text: text, in: base.view)
    }
    
    /// 显示成功
    /// - Parameters:
    ///   - text: 文字
    ///   - view: 在哪个视图上显示，默认在window
    ///   - completion: 完成后回调
    public func showSuccess(text: String? = nil,
                            completion: (() -> Void)? = nil) {
        DLToast.showSuccess(text: text, in: base.view, completion: completion)
    }
    
    /// 显示错误
    /// - Parameters:
    ///   - text: 文字
    ///   - completion: 完成后回调
    public func showError(text: String? = nil,
                          completion: (() -> Void)? = nil) {
        DLToast.showError(text: text, in: base.view, completion: completion)
    }
    
    /// 显示警告信息
    /// - Parameters:
    ///   - text: 文字
    ///   - completion: 完成后回调
    public func showInfo(text: String? = nil,
                         completion: (() -> Void)? = nil) {
        DLToast.showInfo(text: text, in: base.view, completion: completion)
    }
    
    /// 显示toast
    /// - Parameters:
    ///   - text: 文字
    ///   - icon: 图标
    ///   - config: 配置信息
    ///   - style: 样式
    ///   - completion: 完成后回调
    public func show(text: String,
                     icon: UIImage? = nil,
                     config: DLToastConfig = DLToastConfig(),
                     style: DLToastConfig.Style = .none,
                     completion: (() -> Void)? = nil) {
        DLToast.show(text: text, icon: icon, config: config, style: style, in: base.view, completion: completion)
    }
    
    /// 隐藏toast
    /// - Parameters:
    ///   - completion: 完成回调
    public func dismiss(delay: TimeInterval = 0,
                        completion: (() -> Void)? = nil) {
        DLToast.dismiss(for: base.view, delay: delay, completion: completion)
    }
}