//
//  AddMessagePopView.swift
//  QuickLocation
//

import UIKit

final class AddMessagePopView: UIView {

    private static let shared = AddMessagePopView(frame: CGRect(origin: .zero, size: kScreenSize))
    private static let primaryBlue = UIColor(hexStr: "#16B3FF")

    private let messages = QuickMessageView.messageList
    private var selectedIndex: Int = 0
    private var completion: ((Int?) -> Void)?

    private let bgView: UIView = {
        let view = UIView()
        view.backgroundColor = .black.withAlphaComponent(0.5)
        return view
    }()

    private let infoView: UIView = {
        let view = UIView()
        view.backgroundColor = .white
        view.layer.cornerRadius = 28
        view.layer.maskedCorners = [.layerMinXMinYCorner, .layerMaxXMinYCorner]
        view.clipsToBounds = true
        return view
    }()

    private let titleLab: UILabel = {
        let label = UILabel()
        label.text = "实时消息"
        label.textColor = UIColor(hexStr: "#293445")
        label.font = .systemFont(ofSize: 18, weight: .bold)
        label.textAlignment = .center
        return label
    }()

    private let stackView: UIStackView = {
        let stack = UIStackView()
        stack.axis = .vertical
        stack.alignment = .leading
        stack.spacing = 12
        return stack
    }()

    private lazy var cancelBtn: UIButton = {
        let btn = UIButton(type: .custom)
        btn.setTitle("取消", for: .normal)
        btn.setTitleColor(Self.primaryBlue, for: .normal)
        btn.titleLabel?.font = FontManager.boboBold(18)
        btn.backgroundColor = .white
        btn.cornerRadius = 16
        btn.layer.borderWidth = 1
        btn.layer.borderColor = Self.primaryBlue.cgColor
        btn.addTarget(self, action: #selector(cancelAction), for: .touchUpInside)
        return btn
    }()

    private lazy var confirmBtn: UIButton = {
        let btn = UIButton(type: .custom)
        btn.setTitle("确定", for: .normal)
        btn.setTitleColor(.white, for: .normal)
        btn.titleLabel?.font = FontManager.boboBold(18)
        btn.backgroundColor = Self.primaryBlue
        btn.cornerRadius = 16
        btn.addTarget(self, action: #selector(confirmAction), for: .touchUpInside)
        return btn
    }()

    override init(frame: CGRect) {
        super.init(frame: frame)
        backgroundColor = .clear
        setupUI()
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    private func setupUI() {
        addSubview(bgView)
        addSubview(infoView)
        bgView.layoutChain.edges()

        infoView.addSubview(titleLab)
        infoView.addSubview(stackView)
        infoView.addSubview(cancelBtn)
        infoView.addSubview(confirmBtn)

        infoView.layoutChain
            .bottom()
            .edgesHorzontal()

        titleLab.layoutChain
            .top(22)
            .edgesHorzontal(20)
            .height(24)

        cancelBtn.layoutChain
            .left(20)
            .bottom(20 + kSafeBottomMargin)
            .height(44)
            .widthToView(confirmBtn)

        confirmBtn.layoutChain
            .leftToRightOfView(cancelBtn, offset: 12)
            .right(20)
            .bottomToView(cancelBtn)
            .height(44)

        stackView.layoutChain
            .topToBottomOfView(titleLab, offset: 20)
            .left(20)
            .right(20)
            .bottomToTopOfView(cancelBtn, offset: -20)

        for (index, text) in messages.enumerated() {
            let button = UIButton(type: .custom)
            button.tag = index
            var configuration = UIButton.Configuration.plain()
            configuration.title = text
            configuration.baseForegroundColor = UIColor(hexStr: "#293445")
            configuration.contentInsets = NSDirectionalEdgeInsets(top: 10, leading: 16, bottom: 10, trailing: 16)
            configuration.titleTextAttributesTransformer = UIConfigurationTextAttributesTransformer { incoming in
                var outgoing = incoming
                outgoing.font = .systemFont(ofSize: 15, weight: .medium)
                return outgoing
            }
            button.configuration = configuration
            button.layer.cornerRadius = 10
            button.layer.borderWidth = 1
            button.addTarget(self, action: #selector(selectMessage(_:)), for: .touchUpInside)
            stackView.addArrangedSubview(button)
        }

        let tap = UITapGestureRecognizer(target: self, action: #selector(cancelAction))
        tap.delegate = self
        addGestureRecognizer(tap)
    }

    private func resetSelection() {
        selectedIndex = 0
        refreshButtons()
        updatePreview()
    }

    private func refreshButtons() {
        for (index, view) in stackView.arrangedSubviews.enumerated() {
            guard let button = view as? UIButton else { continue }
            let selected = index == selectedIndex
            var configuration = button.configuration
            configuration?.baseForegroundColor = selected ? Self.primaryBlue : UIColor(hexStr: "#293445")
            button.configuration = configuration
            button.backgroundColor = selected ? UIColor(hexStr: "#F3FBFF") : UIColor(hexStr: "#F5F6F8")
            button.layer.borderColor = (selected ? Self.primaryBlue : UIColor.clear).cgColor
        }
    }

    private func slideOffTransform() -> CGAffineTransform {
        layoutIfNeeded()
        return CGAffineTransform(translationX: 0, y: max(infoView.bounds.height, kScreenHeight * 0.4))
    }

    private func updatePreview() {
        guard messages.indices.contains(selectedIndex) else { return }
        ReceivedMessagePopView.showPreview(text: messages[selectedIndex])
    }

    @objc private func selectMessage(_ sender: UIButton) {
        selectedIndex = sender.tag
        refreshButtons()
        updatePreview()
    }

    @objc private func cancelAction() {
        completion?(nil)
    }

    @objc private func confirmAction() {
        completion?(selectedIndex)
    }
}

extension AddMessagePopView {
    static func show(completion: @escaping (Int?) -> Void) {
        guard let superView = kKeyWindow else { return }
        let pop = AddMessagePopView.shared
        if pop.superview != nil {
            pop.removeFromSuperview()
        }
        pop.frame = CGRect(x: 0, y: 0, width: kScreenWidth, height: kScreenHeight)
        pop.completion = { index in
            completion(index)
            AddMessagePopView.dismiss()
        }
        pop.bgView.alpha = 0
        superView.addSubview(pop)
        superView.bringSubviewToFront(pop)
        pop.layoutIfNeeded()
        pop.resetSelection()
        pop.infoView.transform = pop.slideOffTransform()
        UIView.animate(withDuration: 0.3, delay: 0, options: .curveEaseOut) {
            pop.bgView.alpha = 1
            pop.infoView.transform = .identity
        }
    }

    static func dismiss() {
        let pop = AddMessagePopView.shared
        guard pop.superview != nil else { return }
        ReceivedMessagePopView.dismissPreview()
        UIView.animate(withDuration: 0.25, delay: 0, options: [.curveEaseIn]) {
            pop.bgView.alpha = 0
            pop.infoView.transform = pop.slideOffTransform()
        } completion: { _ in
            pop.infoView.transform = .identity
            pop.removeFromSuperview()
        }
    }
}

extension AddMessagePopView: UIGestureRecognizerDelegate {
    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {
        touch.view == self || touch.view == bgView
    }
}



final class ReceivedMessagePopView {

    private static let banner: UIView = {
        let view = UIView()
        view.backgroundColor = UIColor.white.withAlphaComponent(0.92)
        view.layer.cornerRadius = 10
        view.isHidden = true
        view.isUserInteractionEnabled = false
        view.addSubview(messageLab)
        messageLab.layoutChain.edges(all: 12)
        return view
    }()

    private static let messageLab: UILabel = {
        let label = UILabel()
        label.font = .systemFont(ofSize: 12, weight: .medium)
        label.textColor = UIColor(hexStr: "#0F2846")
        label.numberOfLines = 2
        return label
    }()

    private static var hideWorkItem: DispatchWorkItem?
    private static var isPreview = false
    private static var showToken = 0
    private static var didInstallConstraints = false

    static func showPreview(text: String) {
        let attr = NSAttributedString(
            string: text,
            attributes: [
                .font: UIFont.systemFont(ofSize: 12, weight: .medium),
                .foregroundColor: UIColor(hexStr: "#0F2846")
            ]
        )
        isPreview = true
        show(attributed: attr, autoHide: false)
    }

    static func showIncoming(nickName: String, message: String) {
        let name = nickName.isEmpty ? "成员" : nickName
        let prefix = "对你说："
        let fullText = name + prefix + message
        let attr = NSMutableAttributedString(string: fullText)
        let fullRange = NSRange(location: 0, length: (fullText as NSString).length)
        let nameRange = NSRange(location: 0, length: (name as NSString).length)
        attr.addAttribute(.font, value: UIFont.systemFont(ofSize: 12, weight: .medium), range: fullRange)
        attr.addAttribute(.foregroundColor, value: UIColor(hexStr: "#333333"), range: fullRange)
        attr.addAttribute(.foregroundColor, value: UIColor(hexStr: "#16B3FF"), range: nameRange)
        isPreview = false
        show(attributed: attr, autoHide: true)
    }

    static func dismissPreview() {
        guard isPreview else { return }
        dismiss()
    }

    static func dismiss() {
        hideWorkItem?.cancel()
        hideWorkItem = nil
        isPreview = false
        guard banner.superview != nil, !banner.isHidden else { return }
        showToken += 1
        let token = showToken
        UIView.animate(withDuration: 0.25, delay: 0, options: [.curveEaseIn]) {
            banner.transform = CGAffineTransform(translationX: 0, y: -90)
            banner.alpha = 0
        } completion: { finished in
            guard finished, token == showToken else { return }
            banner.isHidden = true
            banner.alpha = 1
            banner.transform = .identity
        }
    }

    private static func show(attributed: NSAttributedString, autoHide: Bool) {
        guard let window = kKeyWindow else { return }
        hideWorkItem?.cancel()
        hideWorkItem = nil
        showToken += 1
        let token = showToken
        let view = banner
        if view.superview != window {
            view.removeFromSuperview()
            didInstallConstraints = false
            window.addSubview(view)
        }
        if !didInstallConstraints {
            view.layoutChain
                .top(kStatusBarHeight)
                .centerX()
            view.widthAnchor.constraint(lessThanOrEqualToConstant: kScreenWidth - 30).isActive = true
            didInstallConstraints = true
        }
        window.bringSubviewToFront(view)
        messageLab.attributedText = attributed
        messageLab.preferredMaxLayoutWidth = kScreenWidth - 54
        let shouldAnimateIn = view.isHidden || view.alpha < 1
        view.isHidden = false
        view.alpha = 1
        if shouldAnimateIn {
            view.transform = CGAffineTransform(translationX: 0, y: -90)
            UIView.animate(withDuration: 0.3, delay: 0, options: [.curveEaseOut]) {
                view.transform = .identity
            }
        } else {
            view.transform = .identity
        }
        guard autoHide else { return }
        let work = DispatchWorkItem {
            guard token == showToken else { return }
            dismiss()
        }
        hideWorkItem = work
        DispatchQueue.main.asyncAfter(deadline: .now() + 5, execute: work)
    }
}