jsdw_ios/QuickLocation/Section/Group/CreateGroup/CreateGroupViewModel.swift

//
//  CreateGroupViewModel.swift
//  QuickLocation
//
//  Created by 八条 on 2026/6/3.
//

import RxSwift
import RxCocoa
import RxDataSources
import SwiftyUserDefaults

typealias GroupTagListSectionModel = SectionModel<String, String>

class CreateGroupViewModel {
    enum AddTagResult {
        case success
        case empty
        case duplicate
    }
    
    static let addTagToken = "__add_tag__"
    static let tagMaxLength = 10
    
    struct Input {
        
    }
    struct Output {
        var sectionedItems: Observable<[GroupTagListSectionModel]>
        var groupTemplates: Observable<[GroupTemplateModel]>
    }
    
    let input: Input
    let output: Output
    var disposeBag = DisposeBag()
    
    private let sectionedItems = PublishSubject<[GroupTagListSectionModel]>()
    private let groupTemplates = PublishSubject<[GroupTemplateModel]>()
    
    private var tagList = ["私密", "游戏", "运动", "美食",
                            "自驾", "聚会", "旅行", "学习"]
    
    var selectedTagList: [String] = [] {
        didSet {
            loadData()
        }
    }
    
    var groupType = 0
    let groupName = BehaviorRelay<String>(value: "")
    let groupDesc = BehaviorRelay<String>(value: "")
    
    // MARK: - Cell点击
    lazy var cellAction: Action<String, Void> = { this in
        return Action { tag in
            if let idx = this.selectedTagList.firstIndex(of: tag) {
                this.selectedTagList.remove(at: idx)
            } else {
                this.selectedTagList.append(tag)
            }
            return .empty()
        }
    }(self)
    
    /// 当前tag是否选中
    func isSelected(tag: String) -> Bool {
        return selectedTagList.first(where: { tag == $0 }) != nil
    }
    
    func addCustomTag(_ raw: String) -> AddTagResult {
        let trimmed = raw.trimmingCharacters(in: .whitespacesAndNewlines)
        guard !trimmed.isEmpty else { return .empty }
        let tag = String(trimmed.prefix(Self.tagMaxLength))
        if tagList.contains(tag) {
            return .duplicate
        }
        tagList.append(tag)
        selectedTagList.append(tag)
        return .success
    }
    
    // MARK: - 加载数据
    func loadData() {
        sectionedItems.onNext(tagList.mapSection())
    }

    func requestGroupTemplates() {
        GroupService.groupTemplates()
            .subscribe(onNext: { [weak self] response in
                guard response.code == "0", !response.list.isEmpty else {
                    DLToast.showError(text: response.message ?? "获取圈子类型失败")
                    return
                }
                self?.groupType = response.list[0].type
                self?.groupTemplates.onNext(response.list)
            }, onError: { error in
                DLToast.showError(text: error.localizedDescription)
            })
            .disposed(by: disposeBag)
    }
    
    // MARK: - Request
    func requestCreateGroup() {
        let name = groupName.value.trimmingCharacters(in: .whitespacesAndNewlines)
        guard !name.isEmpty else {
            DLToast.show(text: "请输入圈子名称")
            return
        }
        
        let desc = groupDesc.value.trimmingCharacters(in: .whitespacesAndNewlines)
        guard !desc.isEmpty else {
            DLToast.show(text: "请输入圈子描述")
            return
        }

        guard groupType > 0 else {
            DLToast.showError(text: "圈子类型尚未加载")
            return
        }
        
        DLToast.showLoading()
        GroupService.operate(opType: "create",
                             requestData: ["group_name": name,
                                           "group_type": groupType,
                                           "description": desc,
                                           "labels": selectedTagList]).subscribe(onNext: { response in
            DLToast.showSuccess(text: "创建成功") {
                NotificationCenter.default.post(name: .RefreshIMGroupListNotification, object: nil)
                AppRouter.shared.popOrDismiss()
            }
        }, onError: { (error) in
            guard let code = error.underlyingError?.code else { return }
            
            guard let systemConfig = AppContextManager.shared.systemConfig, systemConfig.isIntercept == false else { return }
            if code == 20009 { // "您创建的圈子个数已达上限，请升级会员等级"
                CreateGroupVipPopView.show()
            }
            else {
                DLToast.show(text: error.localizedDescription)
            }
        }).disposed(by: disposeBag)
    }
    
    // MARK: - init
    init() {
        input = Input()
        output = Output(
            sectionedItems: sectionedItems.asObservable(),
            groupTemplates: groupTemplates.asObservable()
        )
    }
}