//
//  LNUserSearchOverviewListView.swift
//  Lanu
//
//  Created by OpenAI Codex on 2026/3/19.
//

import Foundation
import UIKit
import SnapKit
import MJRefresh


protocol LNUserSearchOverviewListViewDelegate: NSObject {
    func onUserSearchOverviewListView(view: LNUserSearchOverviewListView, didClickMore tab: LNUserSearchTab)
}


class LNUserSearchOverviewListView: UIView {
    private let emptyView = LNNoMoreDataView()
    private let scrollView = UIScrollView()
    
    private let userMaxShowCount = 3
    private var userViews: [LNUserSearchUserCardView] = []
    private let userSectionView = UIView()
    
    private let roomMaxShowCount = 2
    private let roomStackView = LNMultiLineStackView()
    private var roomViews: [LNUserSearchRoomCardView] = []
    private let roomSectionView = UIView()
    
    private var curKeyword: String?
    weak var delegate: LNUserSearchOverviewListViewDelegate?
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        setupViews()
    }
    
    func search(_ keyword: String) {
        userSectionView.isHidden = true
        roomSectionView.isHidden = true
        
        curKeyword = keyword
        
        reload()
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

extension LNUserSearchOverviewListView {
    private func reload() {
        guard let curKeyword else { return }
        
        LNGameMateManager.shared.mixSearch(keyword: curKeyword) { [weak self] res in
            guard let self else { return }
            scrollView.mj_header?.endRefreshing()
            
            guard let res else { return }
            emptyView.hide()
            
            if res.playmate.isEmpty {
                userSectionView.isHidden = true
            } else {
                userSectionView.isHidden = false
                for (index, userView) in userViews.enumerated() {
                    if index < res.playmate.count {
                        userView.update(res.playmate[index])
                        userView.isHidden = false
                    } else {
                        userView.isHidden = true
                    }
                }
            }
            
            if res.rooms.isEmpty {
                roomSectionView.isHidden = true
            } else {
                roomSectionView.isHidden = false
                var views: [UIView] = []
                for (index, roomView) in roomViews.enumerated() {
                    if index < res.rooms.count {
                        roomView.update(res.rooms[index])
                        views.append(roomView)
                    }
                }
                roomStackView.update(views)
            }
            
            if res.playmate.isEmpty, res.rooms.isEmpty {
                emptyView.showNoData(tips: .init(key: "A00244"))
            }
        }
    }
}

extension LNUserSearchOverviewListView {
    private func setupViews() {
        backgroundColor = .white
        
        let header = MJRefreshNormalHeader { [weak self] in
            guard let self else { return }
            reload()
        }
        header.lastUpdatedTimeLabel?.isHidden = true
        header.stateLabel?.isHidden = true
        scrollView.mj_header = header
        scrollView.showsVerticalScrollIndicator = false
        addSubview(scrollView)
        scrollView.snp.makeConstraints { make in
            make.edges.equalToSuperview()
        }
        
        let stackView = UIStackView()
        stackView.axis = .vertical
        scrollView.addSubview(stackView)
        stackView.snp.makeConstraints { make in
            make.edges.equalToSuperview()
            make.width.equalTo(scrollView)
        }
        
        stackView.addArrangedSubview(buildUserView())
        stackView.addArrangedSubview(buildRoomView())
        
        scrollView.addSubview(emptyView)
        emptyView.snp.makeConstraints { make in
            make.centerX.equalToSuperview()
            make.centerY.equalToSuperview().multipliedBy(0.6)
        }
    }
    
    private func buildHeader(title: String, action: @escaping () -> Void) -> UIView {
        let container = UIView()
        
        let titleLabel = UILabel()
        titleLabel.text = title
        titleLabel.font = .heading_h5
        titleLabel.textColor = .text_5
        container.addSubview(titleLabel)
        titleLabel.snp.makeConstraints { make in
            make.verticalEdges.equalToSuperview()
            make.leading.equalToSuperview().offset(16)
        }
        
        let config = UIImage.SymbolConfiguration(pointSize: 9)
        let button = UIButton(type: .system)
        button.setTitle(.init(key: "A00048"), for: .normal)
        button.setTitleColor(.text_4, for: .normal)
        button.titleLabel?.font = .body_xs
        button.semanticContentAttribute = .forceRightToLeft
        button.setImage(UIImage(systemName: "chevron.backward", withConfiguration: config), for: .normal)
        button.tintColor = .text_4
        button.imageView?.contentMode = .scaleAspectFit
        button.addAction(UIAction(handler: { _ in action() }), for: .touchUpInside)
        container.addSubview(button)
        button.snp.makeConstraints { make in
            make.trailing.equalToSuperview().offset(-16)
            make.centerY.equalToSuperview()
        }
        
        return container
    }
    
    private func buildUserView() -> UIView {
        let userHeader = buildHeader(title: .init(key: "A00366")) { [weak self] in
            guard let self else { return }
            delegate?.onUserSearchOverviewListView(view: self, didClickMore: .user)
        }
        userSectionView.addSubview(userHeader)
        userHeader.snp.makeConstraints { make in
            make.horizontalEdges.top.equalToSuperview()
        }
        
        let userStackView = UIStackView()
        userStackView.axis = .vertical
        userSectionView.addSubview(userStackView)
        userStackView.snp.makeConstraints { make in
            make.horizontalEdges.equalToSuperview()
            make.top.equalTo(userHeader.snp.bottom).offset(5)
            make.bottom.equalToSuperview()
        }
        
        for _ in 0..<userMaxShowCount {
            let userView = LNUserSearchUserCardView()
            userStackView.addArrangedSubview(userView)
            userViews.append(userView)
        }
        
        return userSectionView
    }
    
    private func buildRoomView() -> UIView {
        let roomHeader = buildHeader(title: .init(key: "A00367")) { [weak self] in
            guard let self else { return }
            delegate?.onUserSearchOverviewListView(view: self, didClickMore: .rooms)
        }
        roomSectionView.addSubview(roomHeader)
        roomHeader.snp.makeConstraints { make in
            make.horizontalEdges.top.equalToSuperview()
        }
        
        roomStackView.axis = .horizontal
        roomStackView.itemSpacing = 13
        roomStackView.columns = 2
        roomStackView.itemDistribution = .equalSpacing
        roomSectionView.addSubview(roomStackView)
        roomStackView.snp.makeConstraints { make in
            make.horizontalEdges.equalToSuperview().inset(16)
            make.bottom.equalToSuperview()
            make.top.equalTo(roomHeader.snp.bottom).offset(16)
        }
        
        for _ in 0..<roomMaxShowCount {
            let roomView = LNUserSearchRoomCardView()
            roomViews.append(roomView)
        }
        roomStackView.update(roomViews)
        
        return roomSectionView
    }
}