//
//  GroupChatView.swift
//  QuickLocation
//
//  Created by 八条 on 2026/6/4.
//

import UIKit
import RxSwift
import RxCocoa
import Lottie
import AVFoundation

enum VoiceRecordState {
    case began
    case canceling
    case ended(URL?) // nil = cancelled
}

// MARK: - Message Model
struct ChatMessage {
    let id: String
    let isSelf: Bool
    let senderId: String
    let avatar: UIImage
    let senderName: String
    let content: String
    let voiceUrl: String
    var imageUrl: String
    let imageWidth: CGFloat
    let imageHeight: CGFloat
    let timestamp: TimeInterval
    var showTime: Bool = false
    var isUploading: Bool = false
}

class GroupChatView: UIView {

    var disposeBag = DisposeBag()

    /// For scrolling control from VC
    var scrollToBottom: (() -> Void)?
    /// bottomBar 底部约束
    var bottomBarBottomConstraint: NSLayoutConstraint?
    /// 语音录制回调
    var onVoiceRecordState: ((VoiceRecordState) -> Void)?
    private var emojiPlaybackGeneration = 0

    private func setupRx() {
        
    }

    /// 收起所有浮层面板
    func dismissAllPanels(excludeTextField: Bool = false) {
        let needsReset = !emojiPanelView.isHidden
        || !voiceRecordView.isHidden
        || textField.isFirstResponder
        
        guard needsReset else { return }
        stopVisibleEmojiAnimations()
        emojiPanelView.isHidden = true
        voiceRecordView.isHidden = true
        if !excludeTextField { textField.resignFirstResponder() }
        UIView.animate(withDuration: 0.25) {
            self.bottomBar.layoutChain.bottom(kSafeBottomMargin + 20)
            self.voiceRecordView.layoutChain.bottom(-252)
        }
    }

    func playVisibleEmojiAnimations() {
        emojiPlaybackGeneration += 1
        let generation = emojiPlaybackGeneration
        let indexPaths = emojiCollectionView.indexPathsForVisibleItems.sorted { $0.item < $1.item }
        for (offset, indexPath) in indexPaths.enumerated() {
            DispatchQueue.main.asyncAfter(deadline: .now() + Double(offset) * 0.02) { [weak self] in
                guard let self = self,
                      self.emojiPlaybackGeneration == generation,
                      !self.emojiCollectionView.isDragging,
                      !self.emojiCollectionView.isDecelerating,
                      let cell = self.emojiCollectionView.cellForItem(at: indexPath) as? EmojiPanelCell
                else { return }
                cell.playAnimation()
            }
        }
    }

    func stopVisibleEmojiAnimations() {
        emojiPlaybackGeneration += 1
        emojiCollectionView.visibleCells.forEach { cell in
            (cell as? EmojiPanelCell)?.stopAnimation()
        }
    }

    func preloadAdjacentEmojiPages() {
        let items = UIView.emojiFileNames
        guard emojiCollectionView.bounds.width > 0, !items.isEmpty else { return }
        let currentPage = Int(round(emojiCollectionView.contentOffset.x / emojiCollectionView.bounds.width))
        for page in [currentPage - 1, currentPage + 1] where page >= 0 {
            let start = page * Self.emojiPerPage
            guard start < items.count else { continue }
            let end = min(start + Self.emojiPerPage, items.count)
            items[start..<end].forEach { name in
                EmojiPanelCell.loadAnimation(for: name) { _ in }
            }
        }
    }
    
    // MARK: - Setup
    private func setupUI() {
        backgroundColor = UIColor(hexStr: "#F5FBFB")
        addSubview(navBgView)
        addSubview(navBarView)
        navBarView.addSubview(backBtn)
        navBarView.addSubview(groupAvatarView)
        navBarView.addSubview(groupNameLabel)
        navBarView.addSubview(onlineStatusLabel)
        navBarView.addSubview(rightIconsView)

        rightIconsView.addSubview(reviewBtn)
        rightIconsView.addSubview(memberBtn)
        rightIconsView.addSubview(settingBtn)
        rightIconsView.addSubview(reviewDotView)

        addSubview(tableView)
        addSubview(chatWarningView)
        addSubview(bottomBar)
        addSubview(disableIMView)
        bottomBar.addSubview(bottomBarCornerView)
        addSubview(voiceRecordView)
        addSubview(emojiPanelView)
        emojiPanelView.addSubview(emojiCollectionView)
        emojiPanelView.addSubview(emojiPageControl)
        bottomBar.addSubview(voiceBtn)
        bottomBar.addSubview(textField)
        bottomBar.addSubview(emojiBtn)
        bottomBar.addSubview(addBtn)
        bottomBar.addSubview(sendBtn)

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

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

        backBtn.layoutChain
            .top(kStatusBarHeight + 12)
            .left(7)
            .width(24).height(24)

        groupAvatarView.layoutChain
            .centerY(backBtn)
            .leftToRightOfView(backBtn, offset: 5)
            .width(32).height(32)

        groupNameLabel.layoutChain
            .topToView(groupAvatarView)
            .leftToRightOfView(groupAvatarView, offset: 8)

        onlineStatusLabel.layoutChain
            .topToBottomOfView(groupNameLabel, offset: 2)
            .leftToView(groupNameLabel)

        rightIconsView.layoutChain
            .centerY(backBtn)
            .right(15)
            .height(24)

        reviewBtn.layoutChain
            .left().centerY()
            .width(24).height(24)

        reviewDotView.layoutChain
            .topToView(reviewBtn, offset: -2)
            .leftToRightOfView(reviewBtn, offset: -6)
            .width(8)
            .height(8)
        
        memberBtn.layoutChain
            .leftToRightOfView(reviewBtn, offset: 20)
            .centerY()
            .width(24).height(24)

        settingBtn.layoutChain
            .leftToRightOfView(memberBtn, offset: 20)
            .centerY()
            .width(24).height(24)
            .right()

        tableView.layoutChain
            .topToBottomOfView(navBarView)
            .edgesHorzontal()
            .bottomToTopOfView(bottomBar)

        chatWarningView.layoutChain
            .topToBottomOfView(navBarView)
            .edgesHorzontal()
        
        bottomBar.layoutChain
            .edgesHorzontal(15)
            .height(50)
            .bottom(kSafeBottomMargin + 20)

        disableIMView.layoutChain
            .edgesHorzontal(15)
            .height(50)
            .bottom(kSafeBottomMargin + 20)
        
        bottomBarBottomConstraint = bottomBar.jh_constraint(.bottom, toAttribute: .bottom, otherView: bottomBar.superview, relation: .equal)

        bottomBarCornerView.layoutChain.edges()
        
        voiceBtn.layoutChain
            .left(13).centerY()
            .width(28).height(28)

        sendBtn.layoutChain
            .right(19).centerY()
            .width(76).height(34)

        addBtn.layoutChain
            .rightToLeftOfView(sendBtn, offset: -10)
            .centerY()
            .width(28).height(28)

        emojiBtn.layoutChain
            .rightToLeftOfView(addBtn, offset: -10)
            .centerY()
            .width(28).height(28)

        textField.layoutChain
            .leftToRightOfView(voiceBtn, offset: 10)
            .rightToLeftOfView(emojiBtn, offset: -10)
            .centerY()
            .height(36)

        voiceRecordView.layoutChain
            .edgesHorzontal()
            .bottom(-252)
            .height(252)
//            .heightToWidth(252/375)

        emojiPanelView.layoutChain
            .edgesHorzontal()
            .bottom()
            .height(220)

        emojiCollectionView.layoutChain
            .edges(excludingEdge: .bottom)

        emojiPageControl.layoutChain
            .topToBottomOfView(emojiCollectionView)
            .centerX()
            .height(20)
            .bottom()
    }

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

    lazy var navBarView: UIView = {
        let view = UIView()
        view.backgroundColor = .clear
        return view
    }()

    lazy var backBtn: UIButton = {
        let btn = UIButton(type: .custom)
        btn.setImage(UIImage(named: "Common/back"), for: .normal)
        btn.extendEdgeInsets = UIEdgeInsets(top: 20, left: 10, bottom: 20, right: 40)
        return btn
    }()

    lazy var groupAvatarView: UIImageView = {
        let iv = UIImageView()
        iv.contentMode = .scaleAspectFill
        iv.cornerRadius = 16
        iv.clipsToBounds = true
        iv.backgroundColor = UIColor(hexStr: "#E0E0E0")
        return iv
    }()

    lazy var groupNameLabel: UILabel = {
        let label = UILabel()
        label.font = .systemFont(ofSize: 14, weight: .medium)
        label.textColor = UIColor(hexStr: "#333333")
        return label
    }()

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

    lazy var rightIconsView: UIView = {
        let view = UIView()
        view.backgroundColor = .clear
        return view
    }()

    lazy var reviewBtn: UIButton = {
        let btn = UIButton(type: .custom)
        btn.setImage(UIImage(named: "IM/review"), for: .normal)
        btn.isHidden = true
        return btn
    }()
    
    lazy var reviewDotView: UIView = {
        let view = UIView()
        view.backgroundColor = .red
        view.cornerRadius = 4
        view.isHidden = true
        return view
    }()

    lazy var memberBtn: UIButton = {
        let btn = UIButton(type: .custom)
        btn.setImage(UIImage(named: "IM/member"), for: .normal)
        return btn
    }()

    lazy var settingBtn: UIButton = {
        let btn = UIButton(type: .custom)
        btn.setImage(UIImage(named: "IM/setting"), for: .normal)
        return btn
    }()
    
    // MARK: - chatwarning
    lazy var chatWarningView: UIView = {
        let view = UIView()
        view.backgroundColor = .black.withAlphaComponent(0.5)
        view.isHidden = true
        
        view.addSubview(closeBtn)
        closeBtn.layoutChain
            .right(10)
            .height(10)
            .width(10)
            .centerY()
        
        view.addSubview(chatWarningLab)
        chatWarningLab.layoutChain
            .edgesVertical(5)
            .left(15)
            .rightToLeftOfView(closeBtn, offset: -8)
        
        return view
    }()
    
    lazy var closeBtn: UIButton = {
        let btn = UIButton(type: .custom)
        btn.backgroundColor = .clear
        btn.setImage(UIImage(named: "Group/close"), for: .normal)
        btn.extendEdgeInsets = UIEdgeInsets(top: 20, left: 30, bottom: 20, right: 10)
        btn.rx.tap.subscribe(onNext: { _ in
            self.chatWarningView.isHidden = true
        }).disposed(by: disposeBag)
        return btn
    }()
    
    lazy var chatWarningLab: UILabel = {
        let label = UILabel()
        label.textColor = .white
        label.font = .systemFont(ofSize: 10, weight: .regular)
        label.numberOfLines = 0
        return label
    }()
    
    // MARK: - Message List
    lazy var tableView: UITableView = {
        let tv = UITableView(frame: .zero, style: .plain)
        tv.backgroundColor = .clear
        tv.separatorStyle = .none
        tv.showsVerticalScrollIndicator = true
        tv.register(TextSendMsgCell.self)
        tv.register(TextReceivedMsgCell.self)
        tv.register(EmojiSendMsgCell.self)
        tv.register(EmojiReceivedMsgCell.self)
        tv.register(VoiceSendMsgCell.self)
        tv.register(VoiceReceivedMsgCell.self)
        tv.register(ImageSendMsgCell.self)
        tv.register(ImageReceivedMsgCell.self)
        tv.register(NotificationMsgCell.self)
        tv.rowHeight = UITableView.automaticDimension
        tv.contentInset = UIEdgeInsets(top: 8, left: 0, bottom: 8, right: 0)
        return tv
    }()

    // MARK: - Bottom Bar
    lazy var bottomBar: UIView = {
        let view = UIView()
        view.backgroundColor = .clear
        view.layer.shadowColor = UIColor(hexStr: "#0F2846", alpha: 0.1).cgColor
        view.layer.shadowOffset = CGSize(width: 0, height: 0)
        view.layer.shadowOpacity = 1
        view.layer.shadowRadius = 9
        return view
    }()
    
    lazy var bottomBarCornerView: UIView = {
        let view = UIView()
        view.backgroundColor = .white
        view.cornerRadius = 25
        return view
    }()

    lazy var voiceBtn: UIButton = {
        let btn = UIButton(type: .custom)
        btn.setImage(UIImage(named: "IM/voice"), for: .normal)
        return btn
    }()

    lazy var textField: UITextField = {
        let tf = UITextField()
        tf.font = .systemFont(ofSize: 14)
        tf.backgroundColor = .white
        tf.cornerRadius = 18
        tf.placeholder = "输入消息..."
        tf.returnKeyType = .send
        tf.leftView = UIView(frame: CGRect(x: 0, y: 0, width: 12, height: 36))
        tf.leftViewMode = .always
        return tf
    }()

    lazy var emojiBtn: UIButton = {
        let btn = UIButton(type: .custom)
        btn.setImage(UIImage(named: "IM/emoji"), for: .normal)
        return btn
    }()

    lazy var addBtn: UIButton = {
        let btn = UIButton(type: .custom)
        btn.setImage(UIImage(named: "IM/add"), for: .normal)
        return btn
    }()

    lazy var sendBtn: UIButton = {
        let btn = UIButton(type: .custom)
        btn.setTitle("发送", for: .normal)
        btn.setTitleColor(UIColor(hexStr: "#16B3FF"), for: .normal)
        btn.titleLabel?.font = .systemFont(ofSize: 13, weight: .medium)
        btn.backgroundColor = .white
        btn.borderWidth = 1
        btn.borderColor = UIColor(hexStr: "#16B3FF")
        btn.cornerRadius = 17
        return btn
    }()
    
    /// IM功能禁用
    lazy var disableIMView: UIView = {
        let view = UIView()
        view.backgroundColor = .clear
        view.layer.shadowColor = UIColor(hexStr: "#0F2846", alpha: 0.1).cgColor
        view.layer.shadowOffset = CGSize(width: 0, height: 0)
        view.layer.shadowOpacity = 1
        view.layer.shadowRadius = 9
        view.isHidden = true
        
        let v = UIView()
        v.backgroundColor = .white
        v.cornerRadius = 25
        view.addSubview(v)
        v.layoutChain.edges()
        
        let label = UILabel()
        label.text = "开通VIP后可发送消息"
        label.textColor = ThemeManager.shared.color.titleAuxColor
        label.font = .systemFont(ofSize: 15, weight: .medium)
        view.addSubview(label)
        label.layoutChain.centerX().centerY()
        
        return view
    }()

    /// 语音面板
    lazy var voiceRecordView: VoiceRecordView = {
        let v = VoiceRecordView()
        v.isHidden = true
        return v
    }()
    
    // MARK: - 表情面板
    lazy var emojiPanelView: UIView = {
        let v = UIView()
        v.backgroundColor = UIColor(hexStr: "#F5F6F8")
        v.isHidden = true
        return v
    }()

    private static let emojiCols = 4
    private static let emojiRows = 3
    private static let emojiPerPage = emojiCols * emojiRows // 12

    lazy var emojiCollectionView: UICollectionView = {
        let layout = CollectionHFlowLayout()
        let hSpacing: CGFloat = (kScreenWidth - CGFloat(Self.emojiCols) * 50) / CGFloat(Self.emojiCols + 1)
        let vSpacing: CGFloat = (180 - CGFloat(Self.emojiRows) * 50) / CGFloat(Self.emojiRows + 1)
        layout.rows = Self.emojiRows
        layout.colums = Self.emojiCols
        layout.itemSize = CGSize(width: 50, height: 50)
        layout.hSpacing = hSpacing
        layout.vSpacing = vSpacing
        layout.sectionInset = UIEdgeInsets(top: vSpacing, left: hSpacing, bottom: vSpacing, right: hSpacing)
        let cv = UICollectionView(frame: .zero, collectionViewLayout: layout)
        cv.backgroundColor = .clear
        cv.isPagingEnabled = true
        cv.showsHorizontalScrollIndicator = false
        cv.register(EmojiPanelCell.self, forCellWithReuseIdentifier: "EmojiPanelCell")
        cv.delegate = self
        return cv
    }()

    lazy var emojiPageControl: UIPageControl = {
        let pc = UIPageControl()
        pc.numberOfPages = (UIView.emojiFileNames.count + Self.emojiPerPage - 1) / Self.emojiPerPage
        pc.currentPageIndicatorTintColor = UIColor(hexStr: "#16B3FF")
        pc.pageIndicatorTintColor = UIColor(hexStr: "#D0D0D0")
        return pc
    }()

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

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

// MARK: - 发送的消息cell
class TextSendMsgCell: UITableViewCell {
    
    func configure(_ msg: ChatMessage) {
        timeLabel.isHidden = !msg.showTime
        timeLabel.text = msg.showTime ? formatTime(msg.timestamp) : nil
        avatarView.image = msg.avatar
        contentLabel.text = msg.content
    }
    
    private func formatTime(_ t: TimeInterval) -> String {
        let date = Date(timeIntervalSince1970: t)
        let now = Date()
        let calendar = Calendar.current
        let f = DateFormatter()
        if calendar.isDateInToday(date) {
            f.dateFormat = "HH:mm"
        } else if calendar.isDateInYesterday(date) {
            f.dateFormat = "'昨天' HH:mm"
        } else if calendar.isDate(date, equalTo: now, toGranularity: .year) {
            f.dateFormat = "M-d HH:mm"
        } else {
            f.dateFormat = "yyyy-M-d HH:mm"
        }
        return f.string(from: date)
    }
    
    private let timeLabel: UILabel = {
        let label = UILabel()
        label.font = .systemFont(ofSize: 12)
        label.textColor = UIColor(hexStr: "#999999")
        label.textAlignment = .center
        return label
    }()

    private let avatarView: UIImageView = {
        let iv = UIImageView()
        iv.contentMode = .scaleAspectFill
        iv.cornerRadius = 15
        iv.clipsToBounds = true
        iv.backgroundColor = UIColor(hexStr: "#E0E0E0")
        iv.borderWidth = 2
        iv.borderColor = .white
        return iv
    }()

    private let bubbleView: UIView = {
        let v = UIView()
        v.backgroundColor = UIColor(hexStr: "#16B3FF")
        return v
    }()

    private let contentLabel: UILabel = {
        let label = UILabel()
        label.font = .systemFont(ofSize: 14)
        label.numberOfLines = 0
        return label
    }()
    
    override init(style: CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        selectionStyle = .none
        backgroundColor = .clear

        contentView.addSubview(bubbleView)
        bubbleView.addSubview(contentLabel)
        contentView.addSubview(timeLabel)
        contentView.addSubview(avatarView)
        
        timeLabel.layoutChain
            .top()
            .centerX()
        
        avatarView.layoutChain
            .topToBottomOfView(timeLabel, offset: 14)
            .right(12)
            .width(30).height(30)
        
        bubbleView.layoutChain
            .topToBottomOfView(avatarView, offset: -15)
            .rightToView(avatarView, offset: -13)
            .left(60, relation: .greaterThanOrEqual)
            .width(100, relation: .greaterThanOrEqual)
            .height(30, relation: .greaterThanOrEqual)
            .bottom(10)
        
        contentLabel.layoutChain
            .edgesVertical(10)
            .edgesHorzontal(20)
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    override func layoutSubviews() {
        super.layoutSubviews()
        bubbleView.setNeedsLayout()
        bubbleView.layoutIfNeeded()
        bubbleView.setCornerRadius(corners: [.topLeft ,.bottomLeft, .bottomRight],
                                   withCornerRadii: CGSize(width: bubbleView.dl.height / 2, height: bubbleView.dl.height / 2))
    }
}

//MARK: - 收到的消息cell
class TextReceivedMsgCell: UITableViewCell {
    
    func configure(_ msg: ChatMessage) {
        timeLabel.isHidden = !msg.showTime
        timeLabel.text = msg.showTime ? formatTime(msg.timestamp) : nil
        avatarView.image = msg.avatar
        nameLabel.text = msg.senderName
        contentLabel.text = msg.content
    }
    
    private func formatTime(_ t: TimeInterval) -> String {
        let date = Date(timeIntervalSince1970: t)
        let now = Date()
        let calendar = Calendar.current
        let f = DateFormatter()
        if calendar.isDateInToday(date) {
            f.dateFormat = "HH:mm"
        } else if calendar.isDateInYesterday(date) {
            f.dateFormat = "'昨天' HH:mm"
        } else if calendar.isDate(date, equalTo: now, toGranularity: .year) {
            f.dateFormat = "M-d HH:mm"
        } else {
            f.dateFormat = "yyyy-M-d HH:mm"
        }
        return f.string(from: date)
    }
    
    private let timeLabel: UILabel = {
        let label = UILabel()
        label.font = .systemFont(ofSize: 12)
        label.textColor = UIColor(hexStr: "#999999")
        label.textAlignment = .center
        return label
    }()

    private let nameLabel: UILabel = {
        let label = UILabel()
        label.font = .systemFont(ofSize: 10, weight: .regular)
        label.textColor = UIColor(hexStr: "#666666")
        return label
    }()

    private let avatarView: UIImageView = {
        let iv = UIImageView()
        iv.contentMode = .scaleAspectFill
        iv.cornerRadius = 15
        iv.clipsToBounds = true
        iv.backgroundColor = UIColor(hexStr: "#E0E0E0")
        iv.borderWidth = 2
        iv.borderColor = .white
        return iv
    }()

    private let bubbleView: UIView = {
        let v = UIView()
        v.backgroundColor = UIColor(hexStr: "#CCEAFF")
        return v
    }()

    private let contentLabel: UILabel = {
        let label = UILabel()
        label.font = .systemFont(ofSize: 14)
        label.numberOfLines = 0
        return label
    }()
    
    override init(style: CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        selectionStyle = .none
        backgroundColor = .clear

        contentView.addSubview(timeLabel)
        contentView.addSubview(bubbleView)
        bubbleView.addSubview(contentLabel)
        contentView.addSubview(avatarView)
        contentView.addSubview(nameLabel)
        
        timeLabel.layoutChain
            .top()
            .centerX()
        
        bubbleView.layoutChain
            .topToBottomOfView(timeLabel, offset: 14)
            .left(30)
            .right(60, relation: .greaterThanOrEqual)
            .width(100, relation: .greaterThanOrEqual)
            .height(30, relation: .greaterThanOrEqual)
        
        avatarView.layoutChain
            .topToBottomOfView(bubbleView, offset: -15)
            .left(12)
            .width(30).height(30)
            .bottom(10)
        
        nameLabel.layoutChain
            .leftToRightOfView(avatarView, offset: 5)
            .bottomToView(avatarView)
        
        contentLabel.layoutChain
            .edgesVertical(10)
            .edgesHorzontal(20)
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    override func layoutSubviews() {
        super.layoutSubviews()
        bubbleView.setNeedsLayout()
        bubbleView.layoutIfNeeded()
        bubbleView.setCornerRadius(corners: [.topLeft , .topRight, .bottomRight],
                                   withCornerRadii: CGSize(width: bubbleView.dl.height / 2, height: bubbleView.dl.height / 2))
    }
}

// MARK: - 通知消息cell
final class NotificationMsgCell: UITableViewCell {

    func configure(_ text: NSAttributedString, showTime: Bool, timestamp: TimeInterval) {
        timeLabel.isHidden = !showTime
        timeLabel.text = showTime ? formatTime(timestamp) : nil
        contentLabel.attributedText = text
    }

    private func formatTime(_ t: TimeInterval) -> String {
        let date = Date(timeIntervalSince1970: t)
        let now = Date()
        let calendar = Calendar.current
        let f = DateFormatter()
        if calendar.isDateInToday(date) { f.dateFormat = "HH:mm" }
        else if calendar.isDateInYesterday(date) { f.dateFormat = "'昨天' HH:mm" }
        else if calendar.isDate(date, equalTo: now, toGranularity: .year) { f.dateFormat = "M-d HH:mm" }
        else { f.dateFormat = "yyyy-M-d HH:mm" }
        return f.string(from: date)
    }

    private let timeLabel: UILabel = {
        let label = UILabel()
        label.font = .systemFont(ofSize: 12)
        label.textColor = UIColor(hexStr: "#999999")
        label.textAlignment = .center
        return label
    }()

    private let contentLabel: UILabel = {
        let label = UILabel()
        label.font = .systemFont(ofSize: 12)
        label.textColor = UIColor(hexStr: "#999999")
        label.textAlignment = .center
        label.numberOfLines = 0
        return label
    }()

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

        contentView.addSubview(timeLabel)
        contentView.addSubview(contentLabel)

        timeLabel.layoutChain
            .top(10)
            .centerX()

        contentLabel.layoutChain
            .topToBottomOfView(timeLabel, offset: 8)
            .edgesHorzontal(40)
            .bottom(10)
    }

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

// MARK: - 发送的表情消息
final class EmojiSendMsgCell: UITableViewCell {

    private let timeLabel: UILabel = {
        let label = UILabel()
        label.font = .systemFont(ofSize: 12)
        label.textColor = UIColor(hexStr: "#999999")
        label.textAlignment = .center
        return label
    }()

    private let avatarView: UIImageView = {
        let iv = UIImageView()
        iv.contentMode = .scaleAspectFill
        iv.cornerRadius = 15
        iv.clipsToBounds = true
        iv.backgroundColor = UIColor(hexStr: "#E0E0E0")
        iv.borderWidth = 2
        iv.borderColor = .white
        return iv
    }()

    private let lottieView: LottieAnimationView = {
        let v = LottieAnimationView()
        v.contentMode = .scaleAspectFit
        v.loopMode = .loop
        return v
    }()

    private var animationName: String?
    private var shouldPlayAnimation = false

    override init(style: CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        selectionStyle = .none
        backgroundColor = .clear
        contentView.addSubview(timeLabel)
        contentView.addSubview(avatarView)
        contentView.addSubview(lottieView)

        timeLabel.layoutChain.top().centerX()

        avatarView.layoutChain
            .topToBottomOfView(timeLabel, offset: 14)
            .right(12)
            .width(30).height(30)

        lottieView.layoutChain
            .topToBottomOfView(avatarView, offset: -15)
            .right(60)
            .width(60).height(60)
            .bottom(10)
    }

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

    func configure(_ msg: ChatMessage) {
        timeLabel.isHidden = !msg.showTime
        timeLabel.text = msg.showTime ? formatTime(msg.timestamp) : nil
        avatarView.image = msg.avatar
        let index = Int(msg.content.replacingOccurrences(of: "js_emoji:", with: "")) ?? 0
        guard Self.emojiFileNames.indices.contains(index) else {
            animationName = nil
            lottieView.animation = nil
            return
        }
        let name = Self.emojiFileNames[index]
        animationName = name
        shouldPlayAnimation = false
        lottieView.stop()
        lottieView.animation = nil
        lottieView.currentProgress = 0
        EmojiPanelCell.loadAnimation(for: name) { [weak self] animation in
            guard let self = self, self.animationName == name else { return }
            self.lottieView.animation = animation
            self.lottieView.currentProgress = 0
            if self.shouldPlayAnimation {
                self.lottieView.play()
            }
        }
    }

    func playAnimation() {
        shouldPlayAnimation = true
        lottieView.play()
    }

    func stopAnimation() {
        shouldPlayAnimation = false
        lottieView.stop()
    }

    override func prepareForReuse() {
        super.prepareForReuse()
        animationName = nil
        shouldPlayAnimation = false
        lottieView.stop()
        lottieView.animation = nil
    }

    private func formatTime(_ t: TimeInterval) -> String {
        let date = Date(timeIntervalSince1970: t)
        let now = Date()
        let calendar = Calendar.current
        let f = DateFormatter()
        if calendar.isDateInToday(date) { f.dateFormat = "HH:mm" }
        else if calendar.isDateInYesterday(date) { f.dateFormat = "'昨天' HH:mm" }
        else if calendar.isDate(date, equalTo: now, toGranularity: .year) { f.dateFormat = "M-d HH:mm" }
        else { f.dateFormat = "yyyy-M-d HH:mm" }
        return f.string(from: date)
    }
}

// MARK: - 收到的表情消息
final class EmojiReceivedMsgCell: UITableViewCell {

    private let timeLabel: UILabel = {
        let label = UILabel()
        label.font = .systemFont(ofSize: 12)
        label.textColor = UIColor(hexStr: "#999999")
        label.textAlignment = .center
        return label
    }()

    private let avatarView: UIImageView = {
        let iv = UIImageView()
        iv.contentMode = .scaleAspectFill
        iv.cornerRadius = 15
        iv.clipsToBounds = true
        iv.backgroundColor = UIColor(hexStr: "#E0E0E0")
        iv.borderWidth = 2
        iv.borderColor = .white
        return iv
    }()

    private let nameLabel: UILabel = {
        let label = UILabel()
        label.font = .systemFont(ofSize: 10, weight: .regular)
        label.textColor = UIColor(hexStr: "#666666")
        return label
    }()

    private let lottieView: LottieAnimationView = {
        let v = LottieAnimationView()
        v.contentMode = .scaleAspectFit
        v.loopMode = .loop
        return v
    }()

    private var animationName: String?
    private var shouldPlayAnimation = false

    override init(style: CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        selectionStyle = .none
        backgroundColor = .clear
        contentView.addSubview(timeLabel)
        contentView.addSubview(avatarView)
        contentView.addSubview(nameLabel)
        contentView.addSubview(lottieView)

        timeLabel.layoutChain.top().centerX()

        lottieView.layoutChain
            .topToBottomOfView(timeLabel, offset: 14)
            .left(60)
            .width(60).height(60)
        
        avatarView.layoutChain
            .topToBottomOfView(lottieView, offset: -15)
            .left(12)
            .width(30).height(30)
            .bottom(10)
        
        nameLabel.layoutChain
            .leftToRightOfView(avatarView, offset: 5)
            .bottomToView(avatarView)
    }

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

    func configure(_ msg: ChatMessage) {
        timeLabel.isHidden = !msg.showTime
        timeLabel.text = msg.showTime ? formatTime(msg.timestamp) : nil
        avatarView.image = msg.avatar
        nameLabel.text = msg.senderName
        let index = Int(msg.content.replacingOccurrences(of: "js_emoji:", with: "")) ?? 0
        guard Self.emojiFileNames.indices.contains(index) else {
            animationName = nil
            lottieView.animation = nil
            return
        }
        let name = Self.emojiFileNames[index]
        animationName = name
        shouldPlayAnimation = false
        lottieView.stop()
        lottieView.animation = nil
        lottieView.currentProgress = 0
        EmojiPanelCell.loadAnimation(for: name) { [weak self] animation in
            guard let self = self, self.animationName == name else { return }
            self.lottieView.animation = animation
            self.lottieView.currentProgress = 0
            if self.shouldPlayAnimation {
                self.lottieView.play()
            }
        }
    }

    func playAnimation() {
        shouldPlayAnimation = true
        lottieView.play()
    }

    func stopAnimation() {
        shouldPlayAnimation = false
        lottieView.stop()
    }

    override func prepareForReuse() {
        super.prepareForReuse()
        animationName = nil
        shouldPlayAnimation = false
        lottieView.stop()
        lottieView.animation = nil
    }

    private func formatTime(_ t: TimeInterval) -> String {
        let date = Date(timeIntervalSince1970: t)
        let now = Date()
        let calendar = Calendar.current
        let f = DateFormatter()
        if calendar.isDateInToday(date) { f.dateFormat = "HH:mm" }
        else if calendar.isDateInYesterday(date) { f.dateFormat = "'昨天' HH:mm" }
        else if calendar.isDate(date, equalTo: now, toGranularity: .year) { f.dateFormat = "M-d HH:mm" }
        else { f.dateFormat = "yyyy-M-d HH:mm" }
        return f.string(from: date)
    }
}
// MARK: - UICollectionViewDelegate (page control)
extension GroupChatView: UICollectionViewDelegate {

    func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
        guard scrollView == emojiCollectionView else { return }
        stopVisibleEmojiAnimations()
    }

    func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {
        guard scrollView == emojiCollectionView, !decelerate else { return }
        playVisibleEmojiAnimations()
        preloadAdjacentEmojiPages()
    }

    func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
        guard scrollView == emojiCollectionView else { return }
        let page = Int(scrollView.contentOffset.x / scrollView.bounds.width)
        emojiPageControl.currentPage = page
        playVisibleEmojiAnimations()
        preloadAdjacentEmojiPages()
    }

    func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath) {
        guard collectionView == emojiCollectionView else { return }
        guard !collectionView.isDragging, !collectionView.isDecelerating else { return }
        (cell as? EmojiPanelCell)?.playAnimation()
    }

    func collectionView(_ collectionView: UICollectionView, didEndDisplaying cell: UICollectionViewCell, forItemAt indexPath: IndexPath) {
        guard collectionView == emojiCollectionView else { return }
        (cell as? EmojiPanelCell)?.stopAnimation()
    }
}



// MARK: - 发送的语音消息
final class VoiceSendMsgCell: UITableViewCell, VoicePlaybackView {

    private let timeLabel: UILabel = {
        let label = UILabel()
        label.font = .systemFont(ofSize: 12)
        label.textColor = UIColor(hexStr: "#999999")
        label.textAlignment = .center
        return label
    }()

    private let avatarView: UIImageView = {
        let iv = UIImageView()
        iv.contentMode = .scaleAspectFill
        iv.cornerRadius = 15
        iv.clipsToBounds = true
        iv.backgroundColor = UIColor(hexStr: "#E0E0E0")
        iv.borderWidth = 2
        iv.borderColor = .white
        return iv
    }()

    private let bubbleView: UIView = {
        let v = UIView()
        v.backgroundColor = UIColor(hexStr: "#16B3FF")
        return v
    }()

    private let playAnimation: LottieAnimationView = {
        let v = LottieAnimationView()
        if let path = Bundle.main.path(forResource: "message_voice_play", ofType: "json") {
            v.animation = LottieAnimation.filepath(path)
        }
//        v.loopMode = .loop
        v.contentMode = .scaleAspectFit
        return v
    }()

    private let durationLabel: UILabel = {
        let label = UILabel()
        label.font = .systemFont(ofSize: 14)
        label.textColor = UIColor(hexStr: "#1A1A1A")
        return label
    }()

    override init(style: CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        selectionStyle = .none
        backgroundColor = .clear
        contentView.addSubview(timeLabel)
        contentView.addSubview(bubbleView)
        bubbleView.addSubview(playAnimation)
        bubbleView.addSubview(durationLabel)
        contentView.addSubview(avatarView)

        let tap = UITapGestureRecognizer(target: self, action: #selector(togglePlay))
        bubbleView.addGestureRecognizer(tap)

        timeLabel.layoutChain.top().centerX()
        avatarView.layoutChain
            .topToBottomOfView(timeLabel, offset: 14)
            .right(12).width(30).height(30)

        bubbleView.layoutChain
            .topToBottomOfView(avatarView, offset: -15)
            .rightToView(avatarView, offset: -13)
            .width(105).height(39).bottom(10)
        
        playAnimation.layoutChain
            .right(36)
            .centerY()
            .width(20).height(20)

        durationLabel.layoutChain
            .rightToLeftOfView(playAnimation, offset: -4)
            .centerY()
    }

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

    func configure(_ msg: ChatMessage) {
        timeLabel.isHidden = !msg.showTime
        timeLabel.text = msg.showTime ? formatTime(msg.timestamp) : nil
        avatarView.image = msg.avatar
        let dur = msg.content.int / 1000
        durationLabel.text = dur > 0 ? "\(dur)''" : ""
        voiceUrl = msg.voiceUrl
    }

    private var voiceUrl: String?

    @objc private func togglePlay() {
        guard let url = voiceUrl, !url.isEmpty else { return }
        if VoicePlayerManager.shared.state == .playing, VoicePlayerManager.shared.isCurrent(url: url) {
            VoicePlayerManager.shared.pause()
            playAnimation.stop()
        } else {
            VoicePlayerManager.shared.play(urlString: url, playbackView: self) { [weak self] state in
                if state == .paused { self?.playAnimation.stop() }
                else { self?.playAnimation.play() }
            } onFinished: { [weak self] in
                self?.playAnimation.stop()
            }
        }
    }

    func play() { playAnimation.play() }
    func stop() { playAnimation.stop() }

    override func prepareForReuse() {
        super.prepareForReuse()
        playAnimation.stop()
    }

    private func formatTime(_ t: TimeInterval) -> String {
        let date = Date(timeIntervalSince1970: t)
        let now = Date()
        let calendar = Calendar.current
        let f = DateFormatter()
        if calendar.isDateInToday(date) { f.dateFormat = "HH:mm" }
        else if calendar.isDateInYesterday(date) { f.dateFormat = "'昨天' HH:mm" }
        else if calendar.isDate(date, equalTo: now, toGranularity: .year) { f.dateFormat = "M-d HH:mm" }
        else { f.dateFormat = "yyyy-M-d HH:mm" }
        return f.string(from: date)
    }

    override func layoutSubviews() {
        super.layoutSubviews()
        bubbleView.setNeedsLayout()
        bubbleView.layoutIfNeeded()
        bubbleView.setCornerRadius(corners: [.topLeft , .bottomRight, .bottomLeft],
                                   withCornerRadii: CGSize(width: bubbleView.dl.height / 2, height: bubbleView.dl.height / 2))
    }
}

// MARK: - 收到的语音消息
final class VoiceReceivedMsgCell: UITableViewCell, VoicePlaybackView {

    func configure(_ msg: ChatMessage) {
        timeLabel.isHidden = !msg.showTime
        timeLabel.text = msg.showTime ? formatTime(msg.timestamp) : nil
        avatarView.image = msg.avatar
        nameLabel.text = msg.senderName
        let dur = msg.content.int / 1000
        durationLabel.text = dur > 0 ? "\(dur)''" : ""
        voiceUrl = msg.voiceUrl
    }

    private var voiceUrl: String?

    @objc private func togglePlay() {
        guard let url = voiceUrl, !url.isEmpty else { return }
        if VoicePlayerManager.shared.state == .playing, VoicePlayerManager.shared.isCurrent(url: url) {
            VoicePlayerManager.shared.pause()
            playAnimation.stop()
        } else {
            VoicePlayerManager.shared.play(urlString: url, playbackView: self) { [weak self] state in
                if state == .paused { self?.playAnimation.stop() }
                else { self?.playAnimation.play() }
            } onFinished: { [weak self] in
                self?.playAnimation.stop()
            }
        }
    }

    func play() { playAnimation.play() }
    func stop() { playAnimation.stop() }
    
    private func formatTime(_ t: TimeInterval) -> String {
        let date = Date(timeIntervalSince1970: t)
        let now = Date()
        let calendar = Calendar.current
        let f = DateFormatter()
        if calendar.isDateInToday(date) { f.dateFormat = "HH:mm" }
        else if calendar.isDateInYesterday(date) { f.dateFormat = "'昨天' HH:mm" }
        else if calendar.isDate(date, equalTo: now, toGranularity: .year) { f.dateFormat = "M-d HH:mm" }
        else { f.dateFormat = "yyyy-M-d HH:mm" }
        return f.string(from: date)
    }
    
    private let timeLabel: UILabel = {
        let label = UILabel()
        label.font = .systemFont(ofSize: 12)
        label.textColor = UIColor(hexStr: "#999999")
        label.textAlignment = .center
        return label
    }()

    private let avatarView: UIImageView = {
        let iv = UIImageView()
        iv.contentMode = .scaleAspectFill
        iv.cornerRadius = 15
        iv.clipsToBounds = true
        iv.backgroundColor = UIColor(hexStr: "#E0E0E0")
        iv.borderWidth = 2
        iv.borderColor = .white
        return iv
    }()

    private let nameLabel: UILabel = {
        let label = UILabel()
        label.font = .systemFont(ofSize: 10, weight: .regular)
        label.textColor = UIColor(hexStr: "#666666")
        return label
    }()

    private let bubbleView: UIView = {
        let v = UIView()
        v.backgroundColor = UIColor(hexStr: "#CCEAFF")
        return v
    }()

    private let playAnimation: LottieAnimationView = {
        let v = LottieAnimationView()
        if let path = Bundle.main.path(forResource: "message_voice_play", ofType: "json") {
            v.animation = LottieAnimation.filepath(path)
        }
        v.loopMode = .loop
        v.contentMode = .scaleAspectFit
        v.transform = CGAffineTransform(rotationAngle: .pi)
        return v
    }()

    private let durationLabel: UILabel = {
        let label = UILabel()
        label.font = .systemFont(ofSize: 14)
        label.textColor = UIColor(hexStr: "#1A1A1A")
        return label
    }()

    override init(style: CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        selectionStyle = .none
        backgroundColor = .clear
        contentView.addSubview(timeLabel)
        contentView.addSubview(bubbleView)
        bubbleView.addSubview(playAnimation)
        bubbleView.addSubview(durationLabel)
        contentView.addSubview(avatarView)
        contentView.addSubview(nameLabel)
        let tap = UITapGestureRecognizer(target: self, action: #selector(togglePlay))
        bubbleView.addGestureRecognizer(tap)

        timeLabel.layoutChain.top().centerX()
        
        bubbleView.layoutChain
            .topToBottomOfView(timeLabel, offset: 14)
            .width(105)
            .height(39)
        
        avatarView.layoutChain
            .topToBottomOfView(bubbleView, offset: -15)
            .left(12)
            .width(30).height(30)
            .bottom(10)
        
        bubbleView.layoutChain.leftToView(avatarView, offset: 13)
        
        nameLabel.layoutChain
            .leftToRightOfView(avatarView, offset: 5)
            .bottomToView(avatarView)
        
        playAnimation.layoutChain
            .left(36)
            .centerY()
            .width(20).height(20)

        durationLabel.layoutChain
            .leftToRightOfView(playAnimation, offset: 4)
            .centerY()
    }

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

    override func prepareForReuse() {
        super.prepareForReuse()
        playAnimation.stop()
    }
    
    override func layoutSubviews() {
        super.layoutSubviews()
        bubbleView.setNeedsLayout()
        bubbleView.layoutIfNeeded()
        bubbleView.setCornerRadius(corners: [.topLeft , .topRight, .bottomRight],
                                   withCornerRadii: CGSize(width: bubbleView.dl.height / 2, height: bubbleView.dl.height / 2))
    }
}


// MARK: - 发送的图片消息
final class ImageSendMsgCell: UITableViewCell {

    var onImageTap: (() -> Void)?

    func configure(_ msg: ChatMessage) {
        timeLabel.isHidden = !msg.showTime
        timeLabel.text = msg.showTime ? formatTime(msg.timestamp) : nil
        avatarView.image = msg.avatar
        if !msg.imageUrl.isEmpty {
            // 优先加载本地文件路径，否则走网络加载
            if let localImage = UIImage(contentsOfFile: msg.imageUrl) {
                photoView.image = localImage
            } else {
                photoView.dl.setImage(with: msg.imageUrl)
            }
        }
        photoView.layoutChain.width(msg.imageWidth).height(msg.imageHeight)
        loadingView.isHidden = !msg.isUploading
        if msg.isUploading { loadingView.startAnimating() }
    }

    @objc private func onTap() { onImageTap?() }

    private let loadingView: UIActivityIndicatorView = {
        let v = UIActivityIndicatorView(style: UIActivityIndicatorView.Style.large)
        v.hidesWhenStopped = true
        v.color = UIColor(hexStr: "#16B3FF")
        return v
    }()

    private static func displaySize(w: CGFloat, h: CGFloat) -> CGSize {
        guard w > 0, h > 0 else { return CGSize(width: 160, height: 160) }
        let maxW: CGFloat = 200, maxH: CGFloat = 250, minW: CGFloat = 80
        var dw = maxW, dh = dw * (h / w)
        if dh > maxH { dh = maxH; dw = dh * (w / h) }
        if dw < minW { dw = minW; dh = dw * (h / w) }
        return CGSize(width: dw, height: dh)
    }

    private func formatTime(_ t: TimeInterval) -> String {
        let date = Date(timeIntervalSince1970: t)
        let now = Date()
        let calendar = Calendar.current
        let f = DateFormatter()
        if calendar.isDateInToday(date) { f.dateFormat = "HH:mm" }
        else if calendar.isDateInYesterday(date) { f.dateFormat = "'昨天' HH:mm" }
        else if calendar.isDate(date, equalTo: now, toGranularity: .year) { f.dateFormat = "M-d HH:mm" }
        else { f.dateFormat = "yyyy-M-d HH:mm" }
        return f.string(from: date)
    }
    
    private let timeLabel: UILabel = {
        let label = UILabel()
        label.font = .systemFont(ofSize: 12)
        label.textColor = UIColor(hexStr: "#999999")
        label.textAlignment = .center
        return label
    }()

    private let avatarView: UIImageView = {
        let iv = UIImageView()
        iv.contentMode = .scaleAspectFill
        iv.cornerRadius = 15
        iv.clipsToBounds = true
        iv.backgroundColor = UIColor(hexStr: "#E0E0E0")
        iv.borderWidth = 2
        iv.borderColor = .white
        return iv
    }()

    lazy var photoView: UIImageView = {
        let iv = UIImageView()
        iv.contentMode = .scaleAspectFill
        iv.cornerRadius = 8
        iv.clipsToBounds = true
        iv.backgroundColor = UIColor(hexStr: "#F0F0F0")
        iv.isUserInteractionEnabled = true
        return iv
    }()

    override init(style: CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        selectionStyle = .none
        backgroundColor = .clear
        contentView.addSubview(timeLabel)
        contentView.addSubview(photoView)
        contentView.addSubview(avatarView)

        let tap = UITapGestureRecognizer(target: self, action: #selector(onTap))
        photoView.addGestureRecognizer(tap)
        photoView.addSubview(loadingView)
        loadingView.layoutChain.centerX().centerY()

        timeLabel.layoutChain.top().centerX()
        avatarView.layoutChain
            .topToBottomOfView(timeLabel, offset: 14)
            .right(12).width(30).height(30)

        photoView.layoutChain
            .topToBottomOfView(avatarView, offset: -15)
            .rightToView(avatarView, offset: -13)
            .bottom(10)
    }

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

// MARK: - 收到的图片消息
final class ImageReceivedMsgCell: UITableViewCell {

    var onImageTap: (() -> Void)?

    func configure(_ msg: ChatMessage) {
        timeLabel.isHidden = !msg.showTime
        timeLabel.text = msg.showTime ? formatTime(msg.timestamp) : nil
        avatarView.image = msg.avatar
        nameLabel.text = msg.senderName
        if !msg.imageUrl.isEmpty {
            photoView.dl.setImage(with: msg.imageUrl)
        }
        photoView.layoutChain.width(msg.imageWidth).height(msg.imageHeight)
    }

    @objc private func onTap() { onImageTap?() }

    private static func displaySize(w: CGFloat, h: CGFloat) -> CGSize {
        guard w > 0, h > 0 else { return CGSize(width: 160, height: 160) }
        let maxW: CGFloat = 200, maxH: CGFloat = 250, minW: CGFloat = 80
        var dw = maxW, dh = dw * (h / w)
        if dh > maxH { dh = maxH; dw = dh * (w / h) }
        if dw < minW { dw = minW; dh = dw * (h / w) }
        return CGSize(width: dw, height: dh)
    }

    private func formatTime(_ t: TimeInterval) -> String {
        let date = Date(timeIntervalSince1970: t)
        let now = Date()
        let calendar = Calendar.current
        let f = DateFormatter()
        if calendar.isDateInToday(date) { f.dateFormat = "HH:mm" }
        else if calendar.isDateInYesterday(date) { f.dateFormat = "'昨天' HH:mm" }
        else if calendar.isDate(date, equalTo: now, toGranularity: .year) { f.dateFormat = "M-d HH:mm" }
        else { f.dateFormat = "yyyy-M-d HH:mm" }
        return f.string(from: date)
    }
    
    private let timeLabel: UILabel = {
        let label = UILabel()
        label.font = .systemFont(ofSize: 12)
        label.textColor = UIColor(hexStr: "#999999")
        label.textAlignment = .center
        return label
    }()

    private let avatarView: UIImageView = {
        let iv = UIImageView()
        iv.contentMode = .scaleAspectFill
        iv.cornerRadius = 15
        iv.clipsToBounds = true
        iv.backgroundColor = UIColor(hexStr: "#E0E0E0")
        iv.borderWidth = 2
        iv.borderColor = .white
        return iv
    }()

    private let nameLabel: UILabel = {
        let label = UILabel()
        label.font = .systemFont(ofSize: 10, weight: .regular)
        label.textColor = UIColor(hexStr: "#666666")
        return label
    }()

    lazy var photoView: UIImageView = {
        let iv = UIImageView()
        iv.contentMode = .scaleAspectFill
        iv.cornerRadius = 8
        iv.clipsToBounds = true
        iv.backgroundColor = UIColor(hexStr: "#F0F0F0")
        iv.isUserInteractionEnabled = true
        return iv
    }()

    override init(style: CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        selectionStyle = .none
        backgroundColor = .clear
        contentView.addSubview(timeLabel)
        contentView.addSubview(nameLabel)
        contentView.addSubview(photoView)
        contentView.addSubview(avatarView)

        let tap = UITapGestureRecognizer(target: self, action: #selector(onTap))
        photoView.addGestureRecognizer(tap)

        timeLabel.layoutChain.top().centerX()

        photoView.layoutChain
            .topToBottomOfView(timeLabel, offset: 14)
            .width(160).height(160)
        
        avatarView.layoutChain
            .topToBottomOfView(photoView, offset: -15)
            .left(12)
            .width(30).height(30)
            .bottom(10)
        
        photoView.layoutChain.leftToView(avatarView, offset: 13)
        
        nameLabel.layoutChain
            .leftToRightOfView(avatarView, offset: 5)
            .bottomToView(avatarView)
    }

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