//
//  EmergencyContactView.swift
//  QuickLocation
//
//  Created by 八条 on 2026/6/11.
//

import UIKit
import RxSwift
import RxCocoa

class EmergencyContactView: UIView {

    var disposeBag = DisposeBag()
    private let footerView = EmergencyContactFooterView(frame: CGRect(x: 0, y: 0, width: kScreenWidth, height: 92))
    private weak var openedCell: EmergencyContactCell?

    func updateCount(_ count: Int) {
        let prefix = "我的紧急联系人"
        let suffix = "（\(count)人）"
        let attr = NSMutableAttributedString(
            string: prefix,
            attributes: [
                .font: UIFont.systemFont(ofSize: 16, weight: .semibold),
                .foregroundColor: UIColor(hexStr: "#0F2846")
            ]
        )
        attr.append(NSAttributedString(
            string: suffix,
            attributes: [
                .font: UIFont.systemFont(ofSize: 14, weight: .regular),
                .foregroundColor: UIColor(hexStr: "#8D97A8")
            ]
        ))
        titleLab.attributedText = attr
    }

    func setOpenedCell(_ cell: EmergencyContactCell?) {
        if let openedCell, openedCell !== cell {
            openedCell.closeSwipe(animated: true)
        }
        openedCell = cell
    }

    func closeOpenedCell() {
        openedCell?.closeSwipe(animated: true)
        openedCell = nil
    }

    private func setupRx() {
        let tap = UITapGestureRecognizer(target: self, action: #selector(handleBackgroundTap))
        tap.cancelsTouchesInView = false
        tap.delegate = self
        addGestureRecognizer(tap)
    }

    @objc private func handleBackgroundTap() {
        closeOpenedCell()
    }

    private func setupUI() {
        addSubview(navBgView)
        addSubview(navView)
        addSubview(tipsView)
        addSubview(titleLab)
        addSubview(tableView)

        navBgView.layoutChain
            .edges(excludingEdge: .bottom)
            .heightToWidth(160 / 375)

        navView.layoutChain
            .edges(excludingEdge: .bottom)
            .height(kNaviHeight)

        tipsView.layoutChain
            .topToBottomOfView(navView, offset: 8)
            .edgesHorzontal(15)
            .height(36)

        titleLab.layoutChain
            .topToBottomOfView(tipsView, offset: 16)
            .left(15)
            .right(15)

        tableView.layoutChain
            .topToBottomOfView(titleLab, offset: 12)
            .edgesHorzontal()
            .bottom(kSafeBottomMargin)
    }

    lazy var navBgView: UIImageView = {
        let iv = UIImageView()
        iv.image = UIImage(named: "Common/navBar_bg_2")
        iv.contentMode = .scaleAspectFill
        return iv
    }()

    lazy var navView: BaseNavigationView = {
        BaseNavigationView(title: "紧急联系人")
    }()

    lazy var tipsView: UIView = {
        let view = UIView()
        view.backgroundColor = UIColor(hexStr: "#FFF1F1")
        view.cornerRadius = 10

        let icon = UIImageView(image: UIImage(named: "EmergencyContact/info"))
        icon.contentMode = .scaleAspectFit
        view.addSubview(icon)
        icon.layoutChain
            .left(12)
            .centerY()
            .width(14)
            .height(14)

        let label = UILabel()
        label.text = "仅在使用SOS功能或紧急情况下，会主动通知紧急联系人"
        label.font = .systemFont(ofSize: 12, weight: .medium)
        label.textColor = UIColor(hexStr: "#FF5A5F")
        label.adjustsFontSizeToFitWidth = true
        label.minimumScaleFactor = 0.8
        view.addSubview(label)
        label.layoutChain
            .leftToRightOfView(icon, offset: 6)
            .right(12)
            .centerY()

        return view
    }()

    lazy var titleLab: UILabel = {
        let label = UILabel()
        label.numberOfLines = 1
        return label
    }()

    lazy var tableView: UITableView = {
        let tableView = UITableView(frame: .zero, style: .plain)
        tableView.backgroundColor = .clear
        tableView.separatorStyle = .none
        tableView.rowHeight = 92
        tableView.estimatedRowHeight = 92
        tableView.bounces = true
        tableView.showsVerticalScrollIndicator = false
        tableView.register(EmergencyContactCell.self)
        tableView.tableFooterView = footerView
        return tableView
    }()

    override init(frame: CGRect) {
        super.init(frame: .zero)
        backgroundColor = UIColor(hexStr: "#F7F8FA")
        setupUI()
        setupRx()
        updateCount(0)
    }

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

extension EmergencyContactView: UITableViewDelegate, UIGestureRecognizerDelegate {
    func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
        closeOpenedCell()
    }

    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {
        guard let view = touch.view else { return true }
        return !(view is UIControl)
    }
}

// MARK: - EmergencyContactCell
class EmergencyContactCell: UITableViewCell {

    var onDelete: (() -> Void)?
    var onSwipeChanged: ((EmergencyContactCell, Bool) -> Void)?

    private let deleteSize: CGFloat = 68
    private let swipeDelegate = EmergencyContactSwipeDelegate()
    private let cardInset: CGFloat = 15
    private let cardGap: CGFloat = 10
    private var panStartX: CGFloat = 0
    private var isOpen = false
    private var cardLeading: NSLayoutConstraint?
    private var cardTrailing: NSLayoutConstraint?

    func configure(_ model: EmergencyContactModel) {
        nameLab.text = model.name
        phoneLab.text = Self.maskedPhone(model.phone)
        closeSwipe(animated: false)
    }

    func closeSwipe(animated: Bool) {
        setOpen(false, animated: animated)
    }

    override init(style: CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        selectionStyle = .none
        backgroundColor = .clear
        contentView.backgroundColor = .clear
        contentView.clipsToBounds = true
        contentView.layoutMargins = .zero
        preservesSuperviewLayoutMargins = false
        contentView.preservesSuperviewLayoutMargins = false
        setupSubviews()
    }

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

    override func prepareForReuse() {
        super.prepareForReuse()
        closeSwipe(animated: false)
        onDelete = nil
        onSwipeChanged = nil
    }

    private func setupSubviews() {
        contentView.addSubview(deleteBtn)
        contentView.addSubview(cardView)
        cardView.addSubview(nameLab)
        cardView.addSubview(phoneLab)
        cardView.addSubview(arrowIcon)

        deleteBtn.layoutChain
            .right(cardInset)
            .centerY(cardView)
            .width(deleteSize)
            .height(deleteSize)

        cardView.layoutChain
            .top(0)
            .bottom(12)
        cardLeading = cardView.leadingAnchor.constraint(equalTo: contentView.leadingAnchor, constant: cardInset)
        cardTrailing = cardView.trailingAnchor.constraint(equalTo: contentView.trailingAnchor, constant: -cardInset)
        cardLeading?.isActive = true
        cardTrailing?.isActive = true

        nameLab.layoutChain
            .top(18)
            .left(16)
            .rightToLeftOfView(arrowIcon, offset: -8)

        phoneLab.layoutChain
            .topToBottomOfView(nameLab, offset: 6)
            .leftToView(nameLab)
            .rightToView(nameLab)

        arrowIcon.layoutChain
            .right(16)
            .centerY()
            .width(18)
            .height(18)

        let pan = UIPanGestureRecognizer(target: self, action: #selector(handlePan(_:)))
        swipeDelegate.cardView = cardView
        pan.delegate = swipeDelegate
        cardView.addGestureRecognizer(pan)

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

    @objc private func handleDelete() {
        onDelete?()
    }

    @objc private func handleCardTap() {
        if isOpen {
            setOpen(false, animated: true)
            onSwipeChanged?(self, false)
        }
    }

    @objc private func handlePan(_ gesture: UIPanGestureRecognizer) {
        let translation = gesture.translation(in: cardView)
        switch gesture.state {
        case .began:
            panStartX = currentOffset
            enclosingTableView?.isScrollEnabled = false
            onSwipeChanged?(self, true)
        case .changed:
            let next = min(0, max(-maxOffset, panStartX + translation.x))
            applyOffset(next)
        case .ended, .cancelled, .failed:
            enclosingTableView?.isScrollEnabled = true
            let velocity = gesture.velocity(in: cardView).x
            let shouldOpen = velocity < -400 || currentOffset < -maxOffset * 0.45
            setOpen(shouldOpen, animated: true)
            onSwipeChanged?(self, shouldOpen)
        default:
            break
        }
    }

    private var maxOffset: CGFloat {
        deleteSize + cardGap
    }

    private var enclosingTableView: UITableView? {
        var view: UIView? = superview
        while let current = view {
            if let tableView = current as? UITableView {
                return tableView
            }
            view = current.superview
        }
        return nil
    }

    private var currentOffset: CGFloat {
        (cardLeading?.constant ?? cardInset) - cardInset
    }

    private func applyOffset(_ offset: CGFloat) {
        cardLeading?.constant = cardInset + offset
        cardTrailing?.constant = -cardInset + offset
        isOpen = offset <= -maxOffset + 0.5
    }

    private func setOpen(_ open: Bool, animated: Bool) {
        let offset: CGFloat = open ? -maxOffset : 0
        applyOffset(offset)
        let updates = { self.contentView.layoutIfNeeded() }
        if animated {
            UIView.animate(withDuration: 0.22, delay: 0, options: [.curveEaseOut]) {
                updates()
            }
        } else {
            updates()
        }
    }

    private static func maskedPhone(_ phone: String) -> String {
        let digits = phone.filter { $0.isASCII && $0.isNumber }
        guard digits.count >= 7 else { return phone }
        return "\(digits.prefix(3)) **** \(digits.suffix(4))"
    }

    lazy var deleteBtn: UIButton = {
        let btn = UIButton(type: .custom)
        btn.backgroundColor = UIColor(hexStr: "#FF5A5F")
        btn.cornerRadius = 16
        btn.setImage(UIImage(named: "EmergencyContact/trash"), for: .normal)
        btn.addTarget(self, action: #selector(handleDelete), for: .touchUpInside)
        return btn
    }()

    lazy var cardView: UIView = {
        let view = UIView()
        view.backgroundColor = .white
        view.cornerRadius = 16
        view.layer.shadowColor = UIColor(hexStr: "#0F2846", alpha: 0.06).cgColor
        view.layer.shadowOffset = CGSize(width: 0, height: 2)
        view.layer.shadowOpacity = 1
        view.layer.shadowRadius = 8
        return view
    }()

    lazy var nameLab: UILabel = {
        let label = UILabel()
        label.textColor = UIColor(hexStr: "#0F2846")
        label.font = .systemFont(ofSize: 16, weight: .semibold)
        return label
    }()

    lazy var phoneLab: UILabel = {
        let label = UILabel()
        label.textColor = UIColor(hexStr: "#5C6675")
        label.font = .systemFont(ofSize: 14, weight: .regular)
        return label
    }()

    lazy var arrowIcon: UIImageView = {
        let view = UIImageView(image: UIImage(named: "EmergencyContact/arrow_right"))
        view.contentMode = .scaleAspectFit
        return view
    }()
}

private final class EmergencyContactSwipeDelegate: NSObject, UIGestureRecognizerDelegate {
    weak var cardView: UIView?

    func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
        guard let pan = gestureRecognizer as? UIPanGestureRecognizer else { return true }
        let velocity = pan.velocity(in: cardView ?? pan.view)
        return abs(velocity.x) > abs(velocity.y)
    }
}