//
//  GroupView.swift
//  QuickLocation
//
//  Created by 八条 on 2026/5/29.
//

import UIKit
import RxSwift
import RxCocoa
import SDCycleScrollView
import OpenIMSDK
import SwiftDate

// MARK: - PanScrollView（参考 PanScrollView，允许嵌套手势同时识别）
class PanScrollView: UIScrollView {
    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer,
                           shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
        return true
    }
}

class GroupView: UIView {

    var disposeBag = DisposeBag()

    /// 0 = 圈子，1 = 行程
    private(set) var currentTopTab: Int = 0

    /// 当前是否吸顶
    private var isSticky = false
    /// 内部 tableview 是否可滚动
    private var isSubCanScroll = false

    var stickThreshold: CGFloat {
        // segment 在 listContainer 内，吸顶以 listContainer 顶部为准
        return listContainer.dl.y
    }

    // MARK: - Setup
    private func setupUI() {
        addSubview(navBgView)
        addSubview(topBar)
        topBar.addSubview(circleTabLabel)
        topBar.addSubview(itineraryTabLabel)
        topBar.addSubview(messageBtn)

        addSubview(circlePage)
        circlePage.addSubview(mainScrollView)
        mainScrollView.addSubview(contentView)
        contentView.addSubview(actionButtonsView)
        actionButtonsView.addSubview(createGroupBtn)
        actionButtonsView.addSubview(joinGroupBtn)
        contentView.addSubview(listContainer)
        listContainer.addSubview(segmentView)
        segmentView.addSubview(joinedTabLabel)
        segmentView.addSubview(createdTabLabel)
        segmentView.addSubview(tabIndicator)
        listContainer.addSubview(segmentScrollView)
        segmentScrollView.addSubview(segmentContentView)
        // 全部圈子(joined) | 我的圈子(created)
        segmentContentView.addSubview(joinedTableView)
        segmentContentView.addSubview(createdTableView)

        // 保留绑定入口，设计无轮播/热门时隐藏
        contentView.addSubview(cycleScrollView)
        contentView.addSubview(hotGroupTitleLabel)
        contentView.addSubview(hotGroupsCollectionView)
        cycleScrollView.isHidden = true
        hotGroupTitleLabel.isHidden = true
        hotGroupsCollectionView.isHidden = true

        addSubview(itineraryPage)
        itineraryPage.isHidden = true

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

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

        circleTabLabel.layoutChain
            .left(20)
            .bottom(10)
            .height(28)

        itineraryTabLabel.layoutChain
            .leftToRightOfView(circleTabLabel, offset: 20)
            .centerY(circleTabLabel)
            .height(28)

        messageBtn.layoutChain
            .right(16)
            .centerY(circleTabLabel)
            .width(28)
            .height(28)

        circlePage.layoutChain
            .topToBottomOfView(topBar)
            .edges(excludingEdge: .top)

        itineraryPage.layoutChain
            .topToBottomOfView(topBar)
            .edges(excludingEdge: .top)

        mainScrollView.layoutChain
            .edges()

        contentView.layoutChain
            .edges()
            .widthToView(mainScrollView)

        actionButtonsView.layoutChain
            .top(12)
            .edgesHorzontal(16)
            .height(108)

        createGroupBtn.layoutChain
            .left()
            .edgesVertical()
            .widthToView(joinGroupBtn)

        joinGroupBtn.layoutChain
            .topToView(createGroupBtn)
            .bottomToView(createGroupBtn)
            .leftToRightOfView(createGroupBtn, offset: 12)
            .right()
            .widthToView(createGroupBtn)

        listContainer.layoutChain
            .topToBottomOfView(actionButtonsView, offset: 16)
            .edgesHorzontal()
            .bottom()

        let labelWidth = (UIScreen.main.bounds.width - 60) / 2
        segmentView.layoutChain
            .top()
            .edgesHorzontal()
            .height(44)

        joinedTabLabel.layoutChain
            .left(30).centerY()
            .width(labelWidth)

        createdTabLabel.layoutChain
            .right(30).centerY()
            .width(labelWidth)

        tabIndicator.layoutChain
            .topToBottomOfView(joinedTabLabel, offset: 4)
            .centerX(joinedTabLabel)
            .width(19).height(4)

        segmentScrollView.layoutChain
            .topToBottomOfView(segmentView)
            .edgesHorzontal()
            .bottom()
            .height(kScreenHeight - kNaviHeight - 44 - 12 - 108 - 16)

        segmentContentView.layoutChain
            .edges()
            .heightToView(segmentScrollView)

        let svWidth = UIScreen.main.bounds.width
        joinedTableView.layoutChain
            .top().bottom().left()
            .width(svWidth)

        createdTableView.layoutChain
            .top().bottom()
            .leftToRightOfView(joinedTableView)
            .width(svWidth)

        // 离屏占位，避免影响布局
        cycleScrollView.layoutChain
            .top(0).left(0).width(0).height(0)
        hotGroupTitleLabel.layoutChain
            .top(0).left(0).width(0).height(0)
        hotGroupsCollectionView.layoutChain
            .top(0).left(0).width(0).height(0)

        configureActionCard(
            createGroupBtn,
            bgColor: UIColor(hexStr: "#D6F3FF"),
            title: "创建圈子",
            subtitle: "和朋友一起定位玩"
        )
        configureActionCard(
            joinGroupBtn,
            bgColor: UIColor(hexStr: "#E8F8C8"),
            title: "加入圈子",
            subtitle: "输入邀请码快速加入"
        )
    }

    private func configureActionCard(_ card: UIView, bgColor: UIColor, title: String, subtitle: String) {
        card.backgroundColor = bgColor
        card.cornerRadius = 16
        card.clipsToBounds = true

        let titleLab = UILabel()
        titleLab.text = title
        titleLab.font = .systemFont(ofSize: 16, weight: .bold)
        titleLab.textColor = UIColor(hexStr: "#0F2846")

        let subLab = UILabel()
        subLab.text = subtitle
        subLab.font = .systemFont(ofSize: 11, weight: .medium)
        subLab.textColor = UIColor(hexStr: "#6B7A90")

        let cta = UILabel()
        cta.text = "立即体验"
        cta.font = .systemFont(ofSize: 12, weight: .semibold)
        cta.textColor = UIColor(hexStr: "#0F2846")
        cta.textAlignment = .center
        cta.backgroundColor = .white
        cta.cornerRadius = 12
        cta.clipsToBounds = true

        card.addSubview(titleLab)
        card.addSubview(subLab)
        card.addSubview(cta)

        titleLab.layoutChain
            .top(16)
            .left(14)
            .right(14)

        subLab.layoutChain
            .topToBottomOfView(titleLab, offset: 6)
            .left(14)
            .right(14)

        cta.layoutChain
            .left(14)
            .bottom(14)
            .width(72)
            .height(24)
    }

    override func layoutSubviews() {
        super.layoutSubviews()
        segmentContentView.layoutChain.width(bounds.width * 2)
        listContainer.layer.maskedCorners = [.layerMinXMinYCorner, .layerMaxXMinYCorner]
        listContainer.layer.cornerRadius = 20
        listContainer.clipsToBounds = true
    }

    // MARK: - Nav
    lazy var navBgView: UIImageView = {
        let iv = UIImageView()
        iv.image = UIImage(named: "Common/navBar_bg_1")
        iv.contentMode = .scaleAspectFill
        return iv
    }()

    // MARK: - Top Bar
    lazy var topBar: UIView = {
        let v = UIView()
        v.backgroundColor = .clear
        return v
    }()

    lazy var circleTabLabel: UILabel = {
        let label = UILabel()
        label.text = "圈子"
        label.font = FontManager.youSheBiaoTiHei(32)
        label.textColor = UIColor(hexStr: "#0F2846")
        label.isUserInteractionEnabled = true
        return label
    }()

    lazy var itineraryTabLabel: UILabel = {
        let label = UILabel()
        label.text = "行程"
        label.font = FontManager.youSheBiaoTiHei(24)
        label.textColor = UIColor(hexStr: "#0F2846").withAlphaComponent(0.45)
        label.isUserInteractionEnabled = true
        return label
    }()

    lazy var messageBtn: UIButton = {
        let btn = UIButton(type: .custom)
        btn.setImage(UIImage(named: "Home/message"), for: .normal)
        btn.isHidden = true
        return btn
    }()

    lazy var navView: BaseNavigationView = {
        let nav = BaseNavigationView(title: "圈子")
        nav.isHidden = true
        return nav
    }()

    lazy var scanBtn: UIButton = {
        let btn = UIButton(type: .custom)
        btn.setImage(UIImage(named: "Group/scan"), for: .normal)
        btn.isHidden = true
        return btn
    }()

    // MARK: - Pages
    lazy var circlePage: UIView = {
        let v = UIView()
        v.backgroundColor = .clear
        return v
    }()

    lazy var itineraryPage: GroupItineraryView = {
        let v = GroupItineraryView()
        return v
    }()

    // MARK: - Main Scroll
    lazy var mainScrollView: PanScrollView = {
        let sv = PanScrollView()
        sv.backgroundColor = .clear
        sv.delegate = self
        sv.showsVerticalScrollIndicator = false
        sv.bounces = false
        return sv
    }()

    lazy var contentView: UIView = {
        let v = UIView()
        v.backgroundColor = .clear
        return v
    }()

    // MARK: - 轮播图（隐藏保留绑定）
    lazy var cycleScrollView: SDCycleScrollView = {
        let view = SDCycleScrollView(frame: .zero)
        view.backgroundColor = .lightGray
        view.scrollDirection = .horizontal
        view.showPageControl = true
        view.bannerImageViewContentMode = .scaleAspectFill
        view.autoScrollTimeInterval = 5
        view.currentPageDotColor = UIColor(hexStr: "#16B3FF")
        view.pageDotColor = UIColor(hexStr: "#7AD6FF").withAlphaComponent(0.4)
        view.pageControlDotSize = CGSize(width: 8, height: 8)
        view.clipsToBounds = false
        view.pageControlBottomOffset = -34
        return view
    }()

    // MARK: - 创建 / 加入 圈子（色卡，整卡可点）
    private lazy var actionButtonsView: UIView = {
        let v = UIView()
        v.backgroundColor = .clear
        return v
    }()

    lazy var createGroupBtn: UIView = {
        let v = UIView()
        v.isUserInteractionEnabled = true
        return v
    }()

    lazy var joinGroupBtn: UIView = {
        let v = UIView()
        v.isUserInteractionEnabled = true
        return v
    }()

    // MARK: - 热门酷圈（隐藏保留绑定）
    private lazy var hotGroupTitleLabel: UILabel = {
        let label = UILabel()
        label.text = "热门酷圈"
        label.font = .systemFont(ofSize: 16, weight: .semibold)
        label.textColor = ThemeManager.shared.color.titleAuxColor
        return label
    }()

    private(set) lazy var hotGroupsCollectionView: UICollectionView = {
        let layout = UICollectionViewFlowLayout()
        layout.scrollDirection = .horizontal
        layout.itemSize = CGSize(width: 75, height: 88)
        layout.minimumLineSpacing = 10
        layout.sectionInset = UIEdgeInsets(top: 0, left: 18, bottom: 0, right: 18)
        let cv = UICollectionView(frame: .zero, collectionViewLayout: layout)
        cv.backgroundColor = .clear
        cv.showsHorizontalScrollIndicator = false
        cv.register(HotGroupCell.self, forCellWithReuseIdentifier: HotGroupCell.reuseId)
        return cv
    }()

    // MARK: - List container
    private lazy var listContainer: UIView = {
        let v = UIView()
        v.backgroundColor = .white
        return v
    }()

    // MARK: - Segment（0 全部圈子=joined，1 我的圈子=created）
    private(set) lazy var segmentView: UIView = {
        let v = UIView()
        v.backgroundColor = .white

        let line = UIView()
        line.backgroundColor = UIColor(hexStr: "#B5B5B5").withAlphaComponent(0.12)
//        v.addSubview(line)
//        line.layoutChain
//            .edgesHorzontal()
//            .height(1)
//            .bottom(4)

        return v
    }()

    /// 「全部圈子」→ joined 列表（index 0）
    private(set) lazy var joinedTabLabel: UILabel = {
        let label = UILabel()
        label.text = "全部圈子"
        label.font = .systemFont(ofSize: 16, weight: .heavy)
        label.textColor = UIColor(hexStr: "#2A3648")
        label.textAlignment = .center
        label.isUserInteractionEnabled = true
        return label
    }()

    /// 「我的圈子」→ created 列表（index 1）
    private(set) lazy var createdTabLabel: UILabel = {
        let label = UILabel()
        label.text = "我的圈子"
        label.font = .systemFont(ofSize: 16, weight: .medium)
        label.textColor = UIColor(hexStr: "#2A3648")
        label.textAlignment = .center
        label.isUserInteractionEnabled = true
        return label
    }()

    private lazy var tabIndicator: UIView = {
        let v = UIView()
        v.backgroundColor = UIColor(hexStr: "#85D8FF")
        v.layer.cornerRadius = 2
        return v
    }()

    // MARK: - 横向滚动容器 (PanScrollView)
    private(set) lazy var segmentScrollView: PanScrollView = {
        let sv = PanScrollView()
        sv.isPagingEnabled = true
        sv.showsHorizontalScrollIndicator = false
        sv.bounces = false
        sv.delegate = self
        return sv
    }()

    private lazy var segmentContentView: UIView = {
        let v = UIView()
        v.backgroundColor = .clear
        return v
    }()

    // MARK: - 两个列表
    private(set) lazy var createdTableView: UITableView = {
        let tv = UITableView(frame: .zero, style: .plain)
        tv.backgroundColor = .clear
        tv.separatorStyle = .none
        tv.showsVerticalScrollIndicator = false
        tv.register(CircleGroupCell.self)
        tv.estimatedRowHeight = 70
        tv.bounces = true
        tv.contentInset = UIEdgeInsets(top: 0, left: 0, bottom: 97 + kSafeBottomMargin, right: 0)
        return tv
    }()

    private(set) lazy var joinedTableView: UITableView = {
        let tv = UITableView(frame: .zero, style: .plain)
        tv.backgroundColor = .clear
        tv.separatorStyle = .none
        tv.showsVerticalScrollIndicator = false
        tv.register(CircleGroupCell.self)
        tv.estimatedRowHeight = 70
        tv.bounces = true
        tv.contentInset = UIEdgeInsets(top: 0, left: 0, bottom: 97 + kSafeBottomMargin, right: 0)
        return tv
    }()

    // MARK: - Segment
    var currentSegmentIndex: Int = 0

    /// index: 0=全部圈子(joined)，1=我的圈子(created)
    func selectSegment(at index: Int) {
        currentSegmentIndex = index
        let isAll = index == 0

        UIView.animate(withDuration: 0.2) {
            self.joinedTabLabel.textColor = isAll ? UIColor(hexStr: "#2A3648") : UIColor(hexStr: "#2A3648", alpha: 0.5)
            self.joinedTabLabel.font = .systemFont(ofSize: 16, weight: isAll ? .heavy : .medium)
            self.createdTabLabel.textColor = isAll ? UIColor(hexStr: "#2A3648", alpha: 0.5) : UIColor(hexStr: "#2A3648")
            self.createdTabLabel.font = .systemFont(ofSize: 16, weight: isAll ? .medium : .heavy)

            self.tabIndicator.center.x = isAll
                ? self.joinedTabLabel.center.x
                : self.createdTabLabel.center.x

            self.layoutIfNeeded()
        }
    }

    func selectTopTab(at index: Int) {
        guard index == 0 || index == 1 else { return }
        currentTopTab = index
        let isCircle = index == 0
        circlePage.isHidden = !isCircle
        itineraryPage.isHidden = isCircle
        circleTabLabel.font = FontManager.youSheBiaoTiHei(isCircle ? 32 : 24)
        itineraryTabLabel.font = FontManager.youSheBiaoTiHei(isCircle ? 24 : 32)
        circleTabLabel.textColor = isCircle ? UIColor(hexStr: "#353B4F") : UIColor(hexStr: "#2A3648", alpha: 0.5)
        itineraryTabLabel.textColor = isCircle ? UIColor(hexStr: "#2A3648", alpha: 0.5) : UIColor(hexStr: "#353B4F")
    }

    override init(frame: CGRect) {
        super.init(frame: .zero)
        backgroundColor = UIColor(hexStr: "#FAFAFA")
        setupUI()
    }

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

// MARK: - UIScrollViewDelegate（参考 PanView + PanSubItemView 通知模式）
extension GroupView: UIScrollViewDelegate {

    func scrollViewDidScroll(_ scrollView: UIScrollView) {
        if scrollView == mainScrollView {
            handleMainScroll(scrollView)
        } else if scrollView == segmentScrollView {
            let page = Int(round(scrollView.contentOffset.x / scrollView.bounds.width))
            if page != currentSegmentIndex, page >= 0, page < 2 {
                currentSegmentIndex = page
                selectSegment(at: page)
            }
        }
    }

    func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
        guard scrollView != mainScrollView, scrollView != segmentScrollView else { return }
        if scrollView.contentOffset.y > 0 {
            isSubCanScroll = true
        }
    }

    /// 由 GroupViewController 通过 rx.didScroll 转发调用
    func handleTableViewScroll(_ scrollView: UIScrollView) {
        if isSubCanScroll {
            if scrollView.contentOffset.y <= 0 {
                isSubCanScroll = false
                isSticky = false
                scrollView.contentOffset.y = 0
            }
        } else {
            scrollView.contentOffset.y = 0
        }
    }

    // MARK: - 主 scroll 逻辑
    private func handleMainScroll(_ scrollView: UIScrollView) {
        if isSubCanScroll {
            scrollView.contentOffset.y = stickThreshold
            isSticky = true
            selectSegment(at: currentSegmentIndex)
        } else {
            let offsetY = scrollView.contentOffset.y
            if offsetY >= stickThreshold {
                scrollView.contentOffset.y = stickThreshold
                isSticky = true
                isSubCanScroll = true
                selectSegment(at: currentSegmentIndex)
            }
        }
    }
}

// MARK: - HotGroupCell
final class HotGroupCell: UICollectionViewCell {
    static let reuseId = "HotGroupCell"

    private let iconView: UIImageView = {
        let iv = UIImageView()
        iv.contentMode = .scaleAspectFill
        iv.layer.cornerRadius = 10
        iv.clipsToBounds = true
        iv.backgroundColor = .clear
        return iv
    }()

    private let nameLabel: UILabel = {
        let label = UILabel()
        label.font = .systemFont(ofSize: 14, weight: .medium)
        label.textColor = ThemeManager.shared.color.titleAuxColor
        label.textAlignment = .center
        return label
    }()

    private let countLabel: UILabel = {
        let label = UILabel()
        label.font = .systemFont(ofSize: 10, weight: .medium)
        label.textColor = ThemeManager.shared.color.contentColor
        label.textAlignment = .center
        return label
    }()

    override init(frame: CGRect) {
        super.init(frame: frame)
        contentView.addSubview(iconView)
        contentView.addSubview(nameLabel)
        contentView.addSubview(countLabel)

        iconView.layoutChain
            .top().centerX()
            .width(50).height(50)

        nameLabel.layoutChain
            .topToBottomOfView(iconView, offset: 6)
            .edgesHorzontal()

        countLabel.layoutChain
            .topToBottomOfView(nameLabel, offset: 2)
            .edgesHorzontal()
    }

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

    func configure(_ model: GroupInfoModel) {
        iconView.image = model.groupIcon
        nameLabel.text = model.name
        countLabel.text = "共\(model.people_no)个成员"
    }
}

// MARK: - CircleGroupCell
final class CircleGroupCell: UITableViewCell {

    private let iconView: UIImageView = {
        let iv = UIImageView()
        iv.contentMode = .scaleAspectFill
        iv.cornerRadius = 20
        iv.clipsToBounds = true
        iv.backgroundColor = UIColor(hexStr: "#F0F0F0")
        return iv
    }()

    private let nameLabel: UILabel = {
        let label = UILabel()
        label.font = .systemFont(ofSize: 14, weight: .medium)
        label.textColor = ThemeManager.shared.color.titleAuxColor
        return label
    }()

    private let countLabel: UILabel = {
        let label = UILabel()
        label.font = .systemFont(ofSize: 10, weight: .medium)
        label.textColor = UIColor(hexStr: "#999999")
        return label
    }()

    lazy var unreadBadgeView: UIView = {
        let view = UIView()
        view.backgroundColor = UIColor(hexStr: "#FF383C")
        view.cornerRadius = 7
        view.isHidden = true
        return view
    }()

    private let unreadBadge: UILabel = {
        let label = UILabel()
        label.font = .systemFont(ofSize: 10, weight: .medium)
        label.textColor = .white
        return label
    }()

    private let timeLabel: UILabel = {
        let label = UILabel()
        label.font = .systemFont(ofSize: 10, weight: .regular)
        label.textColor = UIColor(hexStr: "#999999")
        label.textAlignment = .right
        return label
    }()

    private let dividerLine: UIView = {
        let v = UIView()
        v.backgroundColor = UIColor(hexStr: "#F0F0F0")
        return v
    }()

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

        contentView.addSubview(iconView)
        contentView.addSubview(nameLabel)
        contentView.addSubview(countLabel)
        contentView.addSubview(unreadBadgeView)
        unreadBadgeView.addSubview(unreadBadge)
        contentView.addSubview(timeLabel)
        contentView.addSubview(dividerLine)

        iconView.layoutChain
            .left(15).edgesVertical(15)
            .width(40).height(40)

        nameLabel.layoutChain
            .topToView(iconView, offset: 4)
            .leftToRightOfView(iconView, offset: 12)
            .right(90)

        countLabel.layoutChain
            .topToBottomOfView(nameLabel, offset: 4)
            .leftToView(nameLabel)

        unreadBadgeView.layoutChain
            .centerY(nameLabel)
            .right(15)

        unreadBadge.layoutChain
            .edgesHorzontal(8)
            .edgesVertical(1)

        timeLabel.layoutChain
            .right(15)
            .centerY(countLabel)

        dividerLine.layoutChain
            .edgesHorzontal(15)
            .bottom()
            .height(0.5)
    }

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

    func configure(_ model: GroupCellData) {
        let g = model.groupInfo
        iconView.image = model.localIcon
        nameLabel.text = g.groupName ?? ""
        countLabel.text = "共\(g.memberCount)个成员"

        // 未读消息数
        if model.unreadCount > 0 {
            unreadBadgeView.isHidden = false
            unreadBadge.text = model.unreadCount > 99 ? "99+" : "\(model.unreadCount)"
        } else {
            unreadBadgeView.isHidden = true
        }

        // 最后消息时间
        if model.lastMsgTime > 0 {
            let date = Date(timeIntervalSince1970: TimeInterval(model.lastMsgTime) / 1000)
            timeLabel.text = date.formatForIM()
        } else {
            timeLabel.text = ""
        }
    }
}

// MARK: - Date IM format
private extension Date {
    func formatForIM() -> String {
        if isToday { return toFormat("HH:mm") }
        if isYesterday { return "昨天" }
        if Calendar.current.isDate(self, equalTo: Date(), toGranularity: .year) { return toFormat("MM/dd") }
        return toFormat("yyyy/MM/dd")
    }
}