//
//  LNPotentialUserViewController.swift
//  Gami
//
//  Created by OneeChan on 2026/3/10.
//

import Foundation
import UIKit
import SnapKit
import MJRefresh

extension UIView {
    func pushToPotentialUsers() {
        let vc = LNPotentialUserViewController()
        navigationController?.pushViewController(vc, animated: true)
    }
}

class LNPotentialUserViewController: LNViewController {
    private let emptyView = LNNoMoreDataView()
    private let tableView = UITableView()
    private var users: [LNPotentialUserVO] = []
    private var isLoading = false
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        setupViews()
        tableView.mj_header?.beginRefreshing()
    }
}

extension LNPotentialUserViewController: UITableViewDataSource {
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        users.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(
            withIdentifier: LNPotentialUserItemCell.className,
            for: indexPath
        ) as! LNPotentialUserItemCell
        
        let item = users[indexPath.row]
        cell.update(item)
        return cell
    }
}

extension LNPotentialUserViewController {
    private func setupViews() {
        title = .init(key: "B00116")
        
        emptyView.isHidden = true
        view.addSubview(emptyView)
        emptyView.snp.makeConstraints { make in
            make.centerX.equalToSuperview()
            make.centerY.equalToSuperview().multipliedBy(0.6)
        }
        
        let header = MJRefreshNormalHeader { [weak self] in
            guard let self else { return }
            self.loadList()
        }
        header.lastUpdatedTimeLabel?.isHidden = true
        header.stateLabel?.isHidden = true
        tableView.mj_header = header
        
        tableView.dataSource = self
        tableView.separatorStyle = .none
        tableView.showsVerticalScrollIndicator = false
        tableView.backgroundColor = .clear
        tableView.allowsSelection = false
        tableView.register(LNPotentialUserItemCell.self, forCellReuseIdentifier: LNPotentialUserItemCell.className)
        view.addSubview(tableView)
        tableView.snp.makeConstraints { make in
            make.edges.equalToSuperview()
        }
    }
    
    private func loadList() {
        guard !isLoading else { return }
        isLoading = true
        
        LNGameMateManager.shared.getPotentialUsers { [weak self] res in
            guard let self else { return }
            isLoading = false
            if let list = res?.list {
                users = list
                tableView.reloadData()
                
                if users.isEmpty {
                    emptyView.showNoData(tips: .init(key: "B00124"))
                } else {
                    emptyView.hide()
                }
            } else {
                if users.isEmpty {
                    emptyView.showNetworkError()
                }
            }
            
            tableView.mj_header?.endRefreshing()
        }
    }
}

private class LNPotentialUserItemCell: UITableViewCell {
    private let avatar = UIImageView()
    private let onlineView = LNOnlineView()
    
    private let nameLabel = UILabel()
    private let genderView = LNGenderView()
    private let newTag = UIView()
    private let chatButton = UIButton()
    
    private var curItem: LNPotentialUserVO?
    
    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        setupViews()
        
        LNEventDeliver.addObserver(self)
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    func update(_ item: LNPotentialUserVO) {
        avatar.showAvatar(item.avatar)
        nameLabel.text = item.nickname
        genderView.update(item.gender, item.age)
        
        newTag.isHidden = !item.newRegister
        onlineView.isHidden = !item.online
        
        if item.contacted {
            chatButton.setTitle(.init(key: "B00117"), for: .normal)
        } else {
            chatButton.setTitle(.init(key: "B00123"), for: .normal)
        }
        
        curItem = item
    }
}

extension LNPotentialUserItemCell: LNIMChatViewModelNotify {
    func onIMDidSendMessage(to uid: String) {
        guard let curItem, uid == curItem.userNo else { return }
        
        curItem.contacted = true
        update(curItem)
    }
}

private extension LNPotentialUserItemCell {
    func setupViews() {
        backgroundColor = .clear
        selectionStyle = .none
        
        let container = UIView()
        container.onTap { [weak self] in
            guard let self else { return }
            guard let curItem else { return }
            pushToProfile(uid: curItem.userNo)
        }
        contentView.addSubview(container)
        container.snp.makeConstraints { make in
            make.horizontalEdges.equalToSuperview().inset(16)
            make.top.equalToSuperview().offset(16)
            make.bottom.equalToSuperview().offset(4)
        }
        
        avatar.layer.cornerRadius = 20
        avatar.clipsToBounds = true
        container.addSubview(avatar)
        avatar.snp.makeConstraints { make in
            make.verticalEdges.equalToSuperview().inset(10)
            make.leading.equalToSuperview().offset(5)
            make.width.height.equalTo(40)
        }
        
        onlineView.offset = 5
        container.addSubview(onlineView)
        onlineView.snp.makeConstraints { make in
            make.edges.equalTo(avatar).inset(-1)
        }
        
        let infoView = UIStackView()
        infoView.axis = .vertical
        infoView.spacing = 4
        infoView.isUserInteractionEnabled = false
        infoView.alignment = .leading
        container.addSubview(infoView)
        infoView.snp.makeConstraints { make in
            make.leading.equalTo(avatar.snp.trailing).offset(13)
            make.centerY.equalToSuperview()
        }
        
        let nameContainer = UIView()
        infoView.addArrangedSubview(nameContainer)
        
        nameLabel.font = .heading_h4
        nameLabel.textColor = .text_5
        nameContainer.addSubview(nameLabel)
        nameLabel.snp.makeConstraints { make in
            make.leading.verticalEdges.equalToSuperview()
        }
        
        nameContainer.addSubview(genderView)
        genderView.snp.makeConstraints { make in
            make.leading.equalTo(nameLabel.snp.trailing).offset(4)
            make.centerY.equalTo(nameLabel)
            make.trailing.lessThanOrEqualToSuperview()
        }
        
        newTag.layer.cornerRadius = 7.5
        newTag.clipsToBounds = true
        newTag.backgroundColor = .primary_3
        infoView.addArrangedSubview(newTag)
        
        let newLabel = UILabel()
        newLabel.text = "New"
        newLabel.font = .body_xs
        newLabel.textColor = .text_1
        newTag.addSubview(newLabel)
        newLabel.snp.makeConstraints { make in
            make.verticalEdges.equalToSuperview().inset(0.5)
            make.horizontalEdges.equalToSuperview().inset(6)
        }
        
        chatButton.setBackgroundImage(.primary_7, for: .normal)
        chatButton.setTitle(.init(key: "B00123"), for: .normal)
        chatButton.titleLabel?.font = .heading_h5
        chatButton.setTitleColor(.text_1, for: .normal)
        chatButton.layer.cornerRadius = 11
        chatButton.clipsToBounds = true
        chatButton.backgroundColor = .fill_2
        chatButton.contentEdgeInsets = .init(top: 0, left: 16, bottom: 0, right: 16)
        chatButton.addAction(UIAction(handler: { [weak self] _ in
            guard let self else { return }
            guard let curItem else { return }
            LNGameMateManager.shared.fetchAutoReplyQuota(uid: curItem.userNo) { [weak self] canSend in
                guard let self else { return }
                guard canSend else { return }
                pushToChat(uid: curItem.userNo, scene: .autoReply)
            }
        }), for: .touchUpInside)
        container.addSubview(chatButton)
        chatButton.snp.makeConstraints { make in
            make.trailing.equalToSuperview()
            make.centerY.equalToSuperview()
            make.height.equalTo(22)
        }
    }
}