//
//  GroupListPopView.swift
//  QuickLocation
//
//  Created by 八条 on 2026/5/30.
//

import UIKit

class GroupListPopView: UIView {

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

    private static let rowHeight: CGFloat = 72
    private static let maxVisibleRows = 3
    private static let primaryBlue = UIColor(hexStr: "#16B3FF")
    private static let cardBg = UIColor(hexStr: "#F5FBFF")
    private static let tagBg = UIColor(hexStr: "#FFF9DD")
    private static let tagText = UIColor(hexStr: "#D5923F")

    private var groupModel: GroupModel? {
        didSet {
            guard let model = groupModel else { return }
            selectedGroupKey = model.default_group_key
            groupList = model.groups
            updateTableHeight()
        }
    }

    private var selectedGroupKey: String = ""

    private var groupList: [GroupInfoModel] = [] {
        didSet {
            tableView.reloadData()
        }
    }

    /// 完成选中进行回调
    private var completion: ((String?) -> Void)?

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

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

    @objc private func confirmAction() {
        completion?(selectedGroupKey.isEmpty ? nil : selectedGroupKey)
    }

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

    lazy var infoView: UIView = {
        let view = UIView()
        view.backgroundColor = .clear
        
        let bg = UIView()
        bg.backgroundColor = UIColor(hexStr: "#FDFDFD")
        view.addSubview(bg)
        bg.layoutChain
            .top(80)
            .edges(excludingEdge: .top)
        
        return view
    }()

    lazy var headerImageView: UIImageView = {
        let view = UIImageView()
        view.image = UIImage(named: "Home/group_list_header")
        view.contentMode = .scaleAspectFill
        view.clipsToBounds = true
        return view
    }()

    lazy var tableView: UITableView = {
        let tableView = UITableView(frame: .zero, style: .plain)
        tableView.backgroundColor = .clear
        tableView.separatorStyle = .none
        tableView.rowHeight = Self.rowHeight
        tableView.estimatedRowHeight = Self.rowHeight
        tableView.showsVerticalScrollIndicator = false
        tableView.bounces = false
        tableView.register(GroupListCell.self)
        tableView.dataSource = self
        tableView.delegate = self
        return tableView
    }()

    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
    }()

    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
    }()

    // MARK: - Init
    override init(frame: CGRect) {
        super.init(frame: frame)
        backgroundColor = .clear
        addSubview(bgView)
        bgView.addSubview(infoView)
        infoView.addSubview(headerImageView)
        infoView.addSubview(tableView)
        infoView.addSubview(cancelBtn)
        infoView.addSubview(confirmBtn)

        bgView.layoutChain.edges()

        infoView.layoutChain
            .bottom()
            .edgesHorzontal()

        headerImageView.layoutChain
            .top()
            .edgesHorzontal()
            .heightToWidth(127/375)

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

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

        tableView.layoutChain
            .topToBottomOfView(headerImageView, offset: -20)
            .edgesHorzontal(12)
            .height(Self.rowHeight)
            .bottomToTopOfView(cancelBtn, offset: -16)

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

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

    private func updateTableHeight() {
        let visible = min(groupList.count, Self.maxVisibleRows)
        let height = CGFloat(visible) * Self.rowHeight
        tableView.layoutChain.height(height)
        tableView.isScrollEnabled = groupList.count > Self.maxVisibleRows
        tableView.reloadData()
    }

    private func slideOffTransform() -> CGAffineTransform {
        layoutIfNeeded()
        let offset = infoView.bounds.height// + 20 + kSafeBottomMargin
        return CGAffineTransform(translationX: 0, y: max(offset, kScreenHeight * 0.5))
    }
}

// MARK: - Public
extension GroupListPopView {

    /// 通过 window 从底部弹出圈子列表
    static func show(groupModel: GroupModel,
                     completion: @escaping ((String?) -> Void)) {
        guard let superView = kKeyWindow else { return }

        let pop = GroupListPopView.shared
        if pop.superview != nil {
            pop.removeFromSuperview()
        }

        pop.frame = CGRect(x: 0, y: 0, width: kScreenWidth, height: kScreenHeight)
        pop.groupModel = groupModel
        pop.completion = { text in
            completion(text)
            GroupListPopView.dismiss()
        }

        pop.bgView.alpha = 0
        superView.addSubview(pop)
        superView.bringSubviewToFront(pop)
        pop.layoutIfNeeded()
        pop.infoView.transform = pop.slideOffTransform()

        UIView.animate(withDuration: 0.3, delay: 0, options: .curveEaseOut) {
            pop.bgView.alpha = 1
            pop.infoView.transform = .identity
        }
    }

    /// 关闭（滑出底部）
    static func dismiss() {
        let pop = GroupListPopView.shared
        guard pop.superview != nil else { return }
        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()
        }
    }
}
// MARK: - UIGestureRecognizerDelegate
extension GroupListPopView: UIGestureRecognizerDelegate {
    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {
        if let view = touch.view, !(view == self || view == bgView) {
            return false
        }
        return true
    }
}

// MARK: - UITableViewDataSource & UITableViewDelegate
extension GroupListPopView: UITableViewDataSource, UITableViewDelegate {
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        groupList.count
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell: GroupListCell = tableView.dequeueReusableCell(for: indexPath)
        let model = groupList[indexPath.row]
        cell.configure(model: model, isSelected: selectedGroupKey == model.group_key)
        return cell
    }

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        selectedGroupKey = groupList[indexPath.row].group_key
        tableView.reloadData()
    }
}

// MARK: - GroupListCell
class GroupListCell: UITableViewCell {

    func configure(model: GroupInfoModel, isSelected: Bool) {
        avaterImgView.image = model.groupIcon
        nameLab.text = model.name
        countLab.text = "共\(model.people_no)成员"

        tagStack.arrangedSubviews.forEach {
            tagStack.removeArrangedSubview($0)
            $0.removeFromSuperview()
        }
        let labels = Array(model.labels.prefix(2))
        tagStack.isHidden = labels.isEmpty
        for text in labels {
            tagStack.addArrangedSubview(Self.makeTagLabel(text))
        }

        cardView.backgroundColor = isSelected ? GroupListPopView.cardBgColor : .white
        cardView.layer.borderWidth = isSelected ? 1 : 0
        cardView.layer.borderColor = GroupListPopView.primaryBlueColor.cgColor

        checkIcon.image = isSelected
            ? UIImage(systemName: "checkmark.circle.fill")
            : UIImage(systemName: "circle")
        checkIcon.tintColor = isSelected
            ? GroupListPopView.primaryBlueColor
            : UIColor(hexStr: "#D0D0D0")
    }

    private static func makeTagLabel(_ text: String) -> UILabel {
        let label = PaddingLabel()
        label.text = text
        label.textColor = GroupListPopView.tagTextColor
        label.font = .systemFont(ofSize: 10, weight: .medium)
        label.backgroundColor = GroupListPopView.tagBgColor
        label.cornerRadius = 4
        label.clipsToBounds = true
        label.textAlignment = .center
        return label
    }

    override init(style: CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        selectionStyle = .none
        backgroundColor = .clear
        contentView.backgroundColor = .clear
        setupSubviews()
    }

    private func setupSubviews() {
        contentView.addSubview(cardView)
        cardView.addSubview(avaterImgView)
        cardView.addSubview(nameLab)
        cardView.addSubview(tagStack)
        cardView.addSubview(countLab)
        cardView.addSubview(checkIcon)

        cardView.layoutChain
            .edgesVertical(4)
            .edgesHorzontal(4)

        avaterImgView.layoutChain
            .left(12)
            .centerY()
            .width(44)
            .height(44)

        checkIcon.layoutChain
            .right(12)
            .centerY()
            .width(22)
            .height(22)

        nameLab.layoutChain
            .topToView(avaterImgView, offset: 2)
            .leftToRightOfView(avaterImgView, offset: 10)
            .rightToLeftOfView(checkIcon, offset: -8, relation: .lessThanOrEqual)

        tagStack.layoutChain
            .leftToRightOfView(nameLab, offset: 6)
            .centerY(nameLab)
            .rightToLeftOfView(checkIcon, offset: -8, relation: .lessThanOrEqual)

        countLab.layoutChain
            .topToBottomOfView(nameLab, offset: 4)
            .leftToView(nameLab)
            .rightToLeftOfView(checkIcon, offset: -8)
    }

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

    lazy var cardView: UIView = {
        let view = UIView()
        view.backgroundColor = .white
        view.cornerRadius = 12
        view.clipsToBounds = true
        return view
    }()

    lazy var avaterImgView: UIImageView = {
        let view = UIImageView()
        view.contentMode = .scaleAspectFill
        view.cornerRadius = 8
        view.clipsToBounds = true
        return view
    }()

    lazy var nameLab: UILabel = {
        let label = UILabel()
        label.textColor = UIColor(hexStr: "#353B4F")
        label.font = .systemFont(ofSize: 15, weight: .medium)
        label.setContentCompressionResistancePriority(.defaultLow, for: .horizontal)
        return label
    }()

    lazy var tagStack: UIStackView = {
        let view = UIStackView()
        view.axis = .horizontal
        view.alignment = .center
        view.spacing = 4
        view.setContentCompressionResistancePriority(.required, for: .horizontal)
        return view
    }()

    lazy var countLab: UILabel = {
        let label = UILabel()
        label.textColor = UIColor(hexStr: "#999999")
        label.font = .systemFont(ofSize: 12, weight: .regular)
        return label
    }()

    lazy var checkIcon: UIImageView = {
        let view = UIImageView()
        view.contentMode = .scaleAspectFit
        view.preferredSymbolConfiguration = UIImage.SymbolConfiguration(pointSize: 20, weight: .regular)
        return view
    }()
}

// MARK: - Color accessors for cell (file-private via static)
private extension GroupListPopView {
    static var primaryBlueColor: UIColor { primaryBlue }
    static var cardBgColor: UIColor { cardBg }
    static var tagBgColor: UIColor { tagBg }
    static var tagTextColor: UIColor { tagText }
}

/// 带内边距的标签
private class PaddingLabel: UILabel {
    private let inset = UIEdgeInsets(top: 2, left: 6, bottom: 2, right: 6)

    override func drawText(in rect: CGRect) {
        super.drawText(in: rect.inset(by: inset))
    }

    override var intrinsicContentSize: CGSize {
        let size = super.intrinsicContentSize
        return CGSize(width: size.width + inset.left + inset.right,
                      height: size.height + inset.top + inset.bottom)
    }
}