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

import UIKit
import RxSwift
import RxCocoa

// MARK: - Message Model
struct ChatMessage {
    let id: String
    let isSelf: Bool
    let senderName: String
    let content: String
    let timestamp: TimeInterval
    var showTime: Bool = false
}

class GroupChatView: UIView {

    var disposeBag = DisposeBag()

    // MARK: - Data
    var messages: [ChatMessage] = [] {
        didSet { tableView.reloadData() }
    }

    // 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)

        addSubview(tableView)
        addSubview(bottomBar)
        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)

        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)

        bottomBar.layoutChain
            .edgesHorzontal()
            .height(56)
            .bottom(kSafeBottomMargin)

        voiceBtn.layoutChain
            .left(12).centerY()
            .width(28).height(28)

        sendBtn.layoutChain
            .right(12).centerY()
            .width(52).height(32)

        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)
    }

    // 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)
        return btn
    }()

    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: - Message List
    lazy var tableView: UITableView = {
        let tv = UITableView(frame: .zero, style: .plain)
        tv.backgroundColor = .clear
        tv.separatorStyle = .none
        tv.showsVerticalScrollIndicator = false
        tv.register(TextMsgCell.self)
        tv.estimatedRowHeight = 60
        tv.rowHeight = UITableView.automaticDimension
        tv.contentInset = UIEdgeInsets(top: 8, left: 0, bottom: 8, right: 0)
        tv.delegate = self
        tv.dataSource = self
        return tv
    }()

    // MARK: - Bottom Bar
    lazy var bottomBar: UIView = {
        let view = UIView()
        view.backgroundColor = UIColor(hexStr: "#F7F8F9")
        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(.white, for: .normal)
        btn.titleLabel?.font = .systemFont(ofSize: 13, weight: .medium)
        btn.backgroundColor = UIColor(hexStr: "#16B3FF")
        btn.cornerRadius = 16
        return btn
    }()

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

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

// MARK: - UITableViewDelegate, UITableViewDataSource
extension GroupChatView: UITableViewDelegate, UITableViewDataSource {

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return messages.count
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell: TextMsgCell = tableView.dequeueReusableCell(for: indexPath)
        cell.configure(messages[indexPath.row])
        return cell
    }
}

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

    private let timeLabel: UILabel = {
        let label = UILabel()
        label.font = .systemFont(ofSize: 11)
        label.textColor = UIColor(hexStr: "#B0B0B0")
        label.textAlignment = .center
        return label
    }()

    private let avatarView: UIImageView = {
        let iv = UIImageView()
        iv.contentMode = .scaleAspectFill
        iv.cornerRadius = 18
        iv.clipsToBounds = true
        return iv
    }()

    private let bubbleView: UIView = {
        let v = UIView()
        v.cornerRadius = 8
        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(avatarView)
        contentView.addSubview(bubbleView)
        bubbleView.addSubview(contentLabel)

        timeLabel.frame = CGRect(x: 0, y: 12, width: kScreenWidth, height: 16)
    }

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

    func configure(_ msg: ChatMessage) {
        timeLabel.isHidden = !msg.showTime
        if msg.showTime {
            timeLabel.text = formatTime(msg.timestamp)
        }
        contentLabel.text = msg.content

        let showTime = msg.showTime
        let topY: CGFloat = showTime ? 34 : 10
        let screenW = kScreenWidth
        let maxBubbleW = screenW - 100
        let contentW = min(msg.content.boundingSize(font: contentLabel.font, maxWidth: maxBubbleW - 24).width + 24, maxBubbleW)

        if msg.isSelf {
            avatarView.isHidden = true
            bubbleView.backgroundColor = UIColor(hexStr: "#16B3FF")
            contentLabel.textColor = .white

            let bubbleH = msg.content.boundingSize(font: contentLabel.font, maxWidth: maxBubbleW - 24).height + 20
            bubbleView.frame = CGRect(x: screenW - 12 - contentW, y: topY, width: contentW, height: bubbleH)
            contentLabel.frame = CGRect(x: 12, y: 10, width: contentW - 24, height: bubbleH - 20)
        } else {
            avatarView.isHidden = false
            avatarView.image = UIImage(named: "GroupIcon1")
            bubbleView.backgroundColor = .white
            contentLabel.textColor = UIColor(hexStr: "#1A1A1A")

            avatarView.frame = CGRect(x: 12, y: topY, width: 36, height: 36)
            let bubbleH = msg.content.boundingSize(font: contentLabel.font, maxWidth: maxBubbleW - 24).height + 20
            bubbleView.frame = CGRect(x: 56, y: topY, width: contentW, height: bubbleH)
            contentLabel.frame = CGRect(x: 12, y: 10, width: contentW - 24, height: bubbleH - 20)
        }
    }

    override func sizeThatFits(_ size: CGSize) -> CGSize {
        // This is handled by rowHeight = automaticDimension + proper intrinsic sizing
        guard let text = contentLabel.text, !text.isEmpty else {
            return CGSize(width: size.width, height: 60)
        }
        let showTime = !timeLabel.isHidden
        let topY: CGFloat = showTime ? 34 : 10
        let maxBubbleW = size.width - 100
        let textH = text.boundingSize(font: contentLabel.font, maxWidth: maxBubbleW - 24).height
        return CGSize(width: size.width, height: topY + textH + 20 + 10)
    }

    private func formatTime(_ t: TimeInterval) -> String {
        let date = Date(timeIntervalSince1970: t)
        let f = DateFormatter()
        f.dateFormat = "M-d HH:mm"
        return f.string(from: date)
    }
}

// MARK: - String bounding helper
private extension String {
    func boundingSize(font: UIFont, maxWidth: CGFloat) -> CGSize {
        let rect = (self as NSString).boundingRect(
            with: CGSize(width: maxWidth, height: .greatestFiniteMagnitude),
            options: [.usesLineFragmentOrigin, .usesFontLeading],
            attributes: [.font: font],
            context: nil
        )
        return CGSize(width: ceil(rect.width), height: ceil(rect.height))
    }
}