//
//  ReceiveMessageReportPopView.swift
//  QuickLocation
//

import IQKeyboardManagerSwift
import UIKit

final class ReceiveMessageReportPopView: UIView {

    private static let shared = ReceiveMessageReportPopView(
        frame: CGRect(origin: .zero, size: kScreenSize)
    )

    private let reasons = ["诈骗", "涉黄", "违规行为", "散播不良广告", "谩骂攻击", "其他"]
    private var selectedReasons = Set<String>()
    private var optionViews: [ReceiveMessageReportOptionView] = []
    private var popCenterYConstraint: NSLayoutConstraint?
    private var wasIQKeyboardEnabled = true

    static func show() {
        guard let window = kKeyWindow else { return }
        let popup = ReceiveMessageReportPopView.shared
        popup.resetState()
        popup.removeFromSuperview()
        window.addSubview(popup)
        window.bringSubviewToFront(popup)
        popup.bgView.alpha = 0
        popup.popView.transform = CGAffineTransform(scaleX: 0.94, y: 0.94)
        UIView.animate(withDuration: 0.22, delay: 0, options: [.curveEaseOut]) {
            popup.bgView.alpha = 1
            popup.popView.transform = .identity
        }
    }

    static func dismiss() {
        let popup = ReceiveMessageReportPopView.shared
        guard popup.superview != nil else { return }
        popup.endEditing(true)
        UIView.animate(withDuration: 0.2, delay: 0, options: [.curveEaseIn]) {
            popup.bgView.alpha = 0
            popup.popView.transform = CGAffineTransform(scaleX: 0.94, y: 0.94)
        } completion: { _ in
            popup.removeFromSuperview()
            popup.resetState()
        }
    }

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

    private let popView = UIView()

    private let popBgView: UIView = {
        let view = UIView()
        view.backgroundColor = .white
        view.layer.cornerRadius = 30
        view.clipsToBounds = true
        return view
    }()

    private let logoImgView = UIImageView(image: UIImage(named: "Popup/bell"))

    private let headerBgImg: UIImageView = {
        let view = UIImageView(image: UIImage(named: "Popup/header_bg"))
        view.contentMode = .scaleAspectFill
        view.clipsToBounds = true
        return view
    }()

    private let titleLabel: UILabel = {
        let label = UILabel()
        label.text = "举报原因"
        label.font = .systemFont(ofSize: 20, weight: .bold)
        label.textColor = UIColor(hexStr: "#293445")
        label.textAlignment = .center
        return label
    }()

    private let optionsStack: UIStackView = {
        let stack = UIStackView()
        stack.axis = .vertical
        stack.spacing = 22
        stack.alignment = .fill
        stack.distribution = .fillEqually
        return stack
    }()

    private let inputContainer: UIView = {
        let view = UIView()
        view.backgroundColor = UIColor(hexStr: "#F4F6FA")
        view.layer.cornerRadius = 16
        return view
    }()

    private let remarkTextView: UITextView = {
        let textView = UITextView()
        textView.backgroundColor = .clear
        textView.font = .systemFont(ofSize: 15, weight: .medium)
        textView.textColor = UIColor(hexStr: "#293445")
        textView.textContainerInset = UIEdgeInsets(top: 12, left: 10, bottom: 12, right: 10)
        textView.textContainer.lineFragmentPadding = 0
        textView.returnKeyType = .done
        return textView
    }()

    private let placeholderLabel: UILabel = {
        let label = UILabel()
        label.text = "请输入..."
        label.font = .systemFont(ofSize: 15, weight: .medium)
        label.textColor = UIColor(hexStr: "#C0C4CC")
        return label
    }()

    private let confirmBtn: UIButton = {
        let button = UIButton(type: .custom)
        button.setTitle("确定", for: .normal)
        button.setTitleColor(.white, for: .normal)
        button.titleLabel?.font = .systemFont(ofSize: 16, weight: .medium)
        button.setBackgroundImage(UIImage(named: "Common/button_bg_2"), for: .normal)
        button.layer.cornerRadius = 25
        button.clipsToBounds = true
        return button
    }()

    private let cancelBtn: UIButton = {
        let button = UIButton(type: .custom)
        button.setTitle("取消", for: .normal)
        button.setTitleColor(UIColor(hexStr: "#16B3FF"), for: .normal)
        button.titleLabel?.font = .systemFont(ofSize: 16, weight: .medium)
        return button
    }()

    override init(frame: CGRect) {
        super.init(frame: frame)
        setupUI()
        setupActions()
    }

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

    override func didMoveToWindow() {
        super.didMoveToWindow()
        if window == nil {
            removeKeyboardObservers()
            IQKeyboardManager.shared.isEnabled = wasIQKeyboardEnabled
        } else {
            wasIQKeyboardEnabled = IQKeyboardManager.shared.isEnabled
            IQKeyboardManager.shared.isEnabled = false
            addKeyboardObservers()
        }
    }

    private func setupUI() {
        addSubview(bgView)
        addSubview(popView)
        popView.addSubview(popBgView)
        popView.addSubview(logoImgView)
        popBgView.addSubview(headerBgImg)
        popBgView.addSubview(titleLabel)
        popBgView.addSubview(optionsStack)
        popBgView.addSubview(inputContainer)
        inputContainer.addSubview(remarkTextView)
        inputContainer.addSubview(placeholderLabel)
        popBgView.addSubview(confirmBtn)
        popBgView.addSubview(cancelBtn)

        bgView.layoutChain.edges()

        popView.layoutChain
            .centerX()
            .width(315)

        popCenterYConstraint = popView.centerYAnchor.constraint(equalTo: centerYAnchor)
        popCenterYConstraint?.isActive = true

        popBgView.layoutChain.edges()

        logoImgView.layoutChain
            .left(16)
            .top(-45)
            .width(109)
            .height(109)

        headerBgImg.layoutChain
            .edges(excludingEdge: .bottom)
            .heightToWidth(100 / 315)

        titleLabel.layoutChain
            .top(70)
            .edgesHorzontal(20)

        optionViews = reasons.map { reason in
            ReceiveMessageReportOptionView(reason: reason, showsExtraHint: reason == "其他")
        }
        for row in 0..<3 {
            let rowStack = UIStackView()
            rowStack.axis = .horizontal
            rowStack.alignment = .fill
            rowStack.distribution = .fillEqually
            rowStack.spacing = 8
            rowStack.isUserInteractionEnabled = true
            rowStack.addArrangedSubview(optionViews[row * 2])
            rowStack.addArrangedSubview(optionViews[row * 2 + 1])
            optionsStack.addArrangedSubview(rowStack)
            rowStack.layoutChain.height(36)
        }
        optionsStack.isUserInteractionEnabled = true

        optionsStack.layoutChain
            .topToBottomOfView(titleLabel, offset: 24)
            .left(24)
            .right(20)
        popBgView.bringSubviewToFront(optionsStack)
        popBgView.bringSubviewToFront(inputContainer)
        popBgView.bringSubviewToFront(confirmBtn)
        popBgView.bringSubviewToFront(cancelBtn)

        inputContainer.layoutChain
            .topToBottomOfView(optionsStack, offset: 16)
            .left(20)
            .right(20)
            .height(86)

        remarkTextView.layoutChain.edges()
        placeholderLabel.layoutChain
            .top(14)
            .left(16)
            .right(16)

        confirmBtn.layoutChain
            .topToBottomOfView(inputContainer, offset: 18)
            .left(20)
            .right(20)
            .height(50)

        cancelBtn.layoutChain
            .topToBottomOfView(confirmBtn)
            .left(20)
            .right(20)
            .height(50)
            .bottom(8)
    }

    private func setupActions() {
        remarkTextView.delegate = self
        confirmBtn.addTarget(self, action: #selector(tapConfirm), for: .touchUpInside)
        cancelBtn.addTarget(self, action: #selector(tapCancel), for: .touchUpInside)

        let tap = UITapGestureRecognizer(target: self, action: #selector(tapBackground))
        tap.cancelsTouchesInView = false
        bgView.addGestureRecognizer(tap)

        for option in optionViews {
            option.addTarget(self, action: #selector(tapOption(_:)), for: .touchUpInside)
        }
    }

    private func resetState() {
        selectedReasons.removeAll()
        remarkTextView.text = ""
        placeholderLabel.isHidden = false
        optionViews.forEach { $0.isChosen = false }
        popCenterYConstraint?.constant = 0
        updateConfirmState()
    }

    private func updateConfirmState() {
        let hasSelection = !selectedReasons.isEmpty
        let otherText = (remarkTextView.text ?? "").trimmingCharacters(in: .whitespacesAndNewlines)
        let otherValid = !selectedReasons.contains("其他") || !otherText.isEmpty
        let enabled = hasSelection && otherValid
        confirmBtn.isEnabled = enabled
        confirmBtn.alpha = enabled ? 1 : 0.45
    }

    @objc private func tapOption(_ sender: ReceiveMessageReportOptionView) {
        sender.isChosen.toggle()
        if sender.isChosen {
            selectedReasons.insert(sender.reason)
        } else {
            selectedReasons.remove(sender.reason)
        }
        updateConfirmState()
    }

    @objc private func tapConfirm() {
        guard confirmBtn.isEnabled else { return }
        endEditing(true)
        DLToast.show(text: "举报成功")
        ReceiveMessageReportPopView.dismiss()
    }

    @objc private func tapCancel() {
        ReceiveMessageReportPopView.dismiss()
    }

    @objc private func tapBackground() {
        endEditing(true)
    }

    private func addKeyboardObservers() {
        NotificationCenter.default.addObserver(
            self,
            selector: #selector(keyboardWillChange(_:)),
            name: UIResponder.keyboardWillChangeFrameNotification,
            object: nil
        )
        NotificationCenter.default.addObserver(
            self,
            selector: #selector(keyboardWillHide(_:)),
            name: UIResponder.keyboardWillHideNotification,
            object: nil
        )
    }

    private func removeKeyboardObservers() {
        NotificationCenter.default.removeObserver(
            self,
            name: UIResponder.keyboardWillChangeFrameNotification,
            object: nil
        )
        NotificationCenter.default.removeObserver(
            self,
            name: UIResponder.keyboardWillHideNotification,
            object: nil
        )
    }

    @objc private func keyboardWillChange(_ notification: Notification) {
        guard
            let userInfo = notification.userInfo,
            let frame = userInfo[UIResponder.keyboardFrameEndUserInfoKey] as? CGRect
        else { return }

        let duration = (userInfo[UIResponder.keyboardAnimationDurationUserInfoKey] as? Double) ?? 0.25
        let keyboardFrame = convert(frame, from: nil)
        let inputFrame = inputContainer.convert(inputContainer.bounds, to: self)
        let overlap = inputFrame.maxY + 16 - keyboardFrame.minY
        popCenterYConstraint?.constant = overlap > 0 ? -overlap : 0
        UIView.animate(withDuration: duration) {
            self.layoutIfNeeded()
        }
    }

    @objc private func keyboardWillHide(_ notification: Notification) {
        let duration = (notification.userInfo?[UIResponder.keyboardAnimationDurationUserInfoKey] as? Double) ?? 0.25
        popCenterYConstraint?.constant = 0
        UIView.animate(withDuration: duration) {
            self.layoutIfNeeded()
        }
    }
}

extension ReceiveMessageReportPopView: UITextViewDelegate {
    func textViewDidChange(_ textView: UITextView) {
        placeholderLabel.isHidden = !(textView.text ?? "").isEmpty
        updateConfirmState()
    }

    func textView(
        _ textView: UITextView,
        shouldChangeTextIn range: NSRange,
        replacementText text: String
    ) -> Bool {
        if text == "\n" {
            textView.resignFirstResponder()
            return false
        }
        return true
    }
}

final class ReceiveMessageReportOptionView: UIButton {

    let reason: String

    var isChosen: Bool = false {
        didSet { boxView.image = isChosen ? Self.selectedImage : Self.normalImage }
    }

    private let boxView = UIImageView()
    private let reasonLabel = UILabel()

    init(reason: String, showsExtraHint: Bool) {
        self.reason = reason
        super.init(frame: .zero)

        boxView.image = Self.normalImage
        boxView.contentMode = .scaleAspectFit

        if showsExtraHint {
            let text = NSMutableAttributedString(
                string: reason,
                attributes: [
                    .font: UIFont.systemFont(ofSize: 16, weight: .medium),
                    .foregroundColor: UIColor(hexStr: "#293445")
                ]
            )
            text.append(
                NSAttributedString(
                    string: " (补充理由)",
                    attributes: [
                        .font: UIFont.systemFont(ofSize: 14, weight: .regular),
                        .foregroundColor: UIColor(hexStr: "#C0C4CC")
                    ]
                )
            )
            reasonLabel.attributedText = text
        } else {
            reasonLabel.text = reason
            reasonLabel.font = .systemFont(ofSize: 16, weight: .medium)
            reasonLabel.textColor = UIColor(hexStr: "#293445")
        }
        reasonLabel.adjustsFontSizeToFitWidth = true
        reasonLabel.minimumScaleFactor = 0.85

        isUserInteractionEnabled = true
        adjustsImageWhenHighlighted = false
        contentHorizontalAlignment = .left
        addSubview(boxView)
        addSubview(reasonLabel)

        boxView.isUserInteractionEnabled = false
        reasonLabel.isUserInteractionEnabled = false

        boxView.layoutChain
            .left()
            .centerY()
            .width(22)
            .height(22)

        reasonLabel.layoutChain
            .leftToRightOfView(boxView, offset: 8)
            .centerY()
            .right(relation: .lessThanOrEqual)

        layoutChain.height(36)
    }

    override var intrinsicContentSize: CGSize {
        CGSize(width: UIView.noIntrinsicMetric, height: 36)
    }

    override func point(inside point: CGPoint, with event: UIEvent?) -> Bool {
        bounds.insetBy(dx: -6, dy: -8).contains(point)
    }

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

    private static let boxSize = CGSize(width: 22, height: 22)

    private static let normalImage = UIGraphicsImageRenderer(size: boxSize).image { _ in
        let rect = CGRect(origin: .zero, size: boxSize).insetBy(dx: 1, dy: 1)
        UIColor.white.setFill()
        UIBezierPath(ovalIn: rect).fill()
        UIColor(hexStr: "#D0D5DD").setStroke()
        let border = UIBezierPath(ovalIn: rect)
        border.lineWidth = 1.5
        border.stroke()
    }

    private static let selectedImage = UIGraphicsImageRenderer(size: boxSize).image { _ in
        let rect = CGRect(origin: .zero, size: boxSize).insetBy(dx: 1, dy: 1)
        UIColor(hexStr: "#16B3FF").setFill()
        UIBezierPath(ovalIn: rect).fill()

        let check = UIBezierPath()
        check.lineWidth = 1.8
        check.lineCapStyle = .round
        check.lineJoinStyle = .round
        check.move(to: CGPoint(x: 6.2, y: 11.4))
        check.addLine(to: CGPoint(x: 9.4, y: 14.6))
        check.addLine(to: CGPoint(x: 16.0, y: 7.8))
        UIColor.white.setStroke()
        check.stroke()
    }
}