//
//  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 {
    struct Input {
        
    }
    struct Output {
        var sectionedItems: Observable<[GroupTagListSectionModel]>
    }
    
    let input: Input
    let output: Output
    var disposeBag = DisposeBag()
    
    private let sectionedItems = PublishSubject<[GroupTagListSectionModel]>()
    
    private let tagList = ["私密", "游戏", "运动", "美食",
                            "自驾", "聚会", "旅行", "学习"]
    
    var selectedTagList: [String] = [] {
        didSet {
            loadData()
        }
    }
    
    var iconIndex = 1
    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
    }
    
    // MARK: - 加载数据
    func loadData() {
        sectionedItems.onNext(tagList.mapSection())
    }
    
    // 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
        }
        
        DLToast.showLoading()
        GroupService.operate(opType: "create",
                             requestData: ["group_name": name,
                                           "icon_index": iconIndex,
                                           "description": desc,
                                           "labels": selectedTagList]).subscribe(onNext: { response in
            DLToast.showSuccess(text: "创建成功") {
                AppRouter.shared.popOrDismiss()
            }
        }, onError: { (error) in
            guard let code = error.underlyingError?.code 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()
        )
    }
}