//
//  CreateGroupVC.swift
//  QuickLocation
//
//  Created by 八条 on 2026/6/2.
//

import UIKit
import RxSwift
import RxCocoa
import RxDataSources

class CreateGroupVC: BaseViewController {

    fileprivate var rootView: CreateGroupView!

    override func loadView() {
        rootView = CreateGroupView(frame: UIScreen.main.bounds)
        view = rootView
    }
    
    private var viewModel = CreateGroupViewModel()

    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = UIColor(hexStr: "#FAFAFA")
        
        bindViewModel()
        reactiveAction()
        
        viewModel.loadData()
        viewModel.requestGroupTemplates()
    }
    
    private func reactiveAction() {
        rootView.iconCarousel.onSelectTemplate = { [weak self] template in
            self?.viewModel.groupType = template.type
            self?.rootView.typeNameLab.text = template.name
        }
        
        rootView.submitBtn.rx.tap.subscribe(onNext: { [weak self] _ in
            self?.viewModel.requestCreateGroup()
        }).disposed(by: disposeBag)
        
        rootView.onConfirmAddTag = { [weak self] text in
            guard let self = self else { return }
            switch self.viewModel.addCustomTag(text) {
            case .success:
                self.rootView.dismissAddTagSheet()
            case .empty:
                DLToast.show(text: "请输入标签")
            case .duplicate:
                DLToast.show(text: "标签已存在")
            }
        }
    }
    
    private func bindViewModel() {
        rootView.groupNameTF.rx.text.orEmpty
            .bind(to: viewModel.groupName)
            .disposed(by: disposeBag)
        
        rootView.groupContentTV.rx.text.orEmpty
            .bind(to: viewModel.groupDesc)
            .disposed(by: disposeBag)
        
        viewModel.output.sectionedItems
            .bind(to: rootView.tagView.rx.items(dataSource: dataSource))
            .disposed(by: disposeBag)

        viewModel.output.groupTemplates
            .observe(on: MainScheduler.instance)
            .subscribe(onNext: { [weak self] templates in
                self?.rootView.configureGroupTemplates(templates)
            })
            .disposed(by: disposeBag)
        
        viewModel.output.sectionedItems
            .observe(on: MainScheduler.instance)
            .subscribe(onNext: { [weak self] _ in
                DispatchQueue.main.async {
                    self?.rootView.updateTagViewHeight()
                }
            })
            .disposed(by: disposeBag)
        
        rootView.tagView.rx.itemSelected
            .subscribe(onNext: { [weak self] indexPath in
                guard let self = self else { return }
                self.rootView.tagView.deselectItem(at: indexPath, animated: false)
                let tag = self.dataSource[indexPath]
                if tag == CreateGroupViewModel.addTagToken {
                    self.rootView.showAddTagSheet()
                } else {
                    self.viewModel.cellAction.execute(tag)
                }
            })
            .disposed(by: disposeBag)
        
        rootView.tagView.rx.setDelegate(self)
            .disposed(by: disposeBag)
    }
    
    // MARK: - dataSource
    private lazy var dataSource: RxCollectionViewSectionedReloadDataSource<GroupTagListSectionModel> = {
        RxCollectionViewSectionedReloadDataSource<GroupTagListSectionModel> { datasource, collectionView, indexPath, item in
            let cell: TagCell = collectionView.dequeueReusableCell(for: indexPath)
            if item == CreateGroupViewModel.addTagToken {
                cell.configureAsAdd()
            } else {
                cell.configure(item, isSelected: self.viewModel.isSelected(tag: item))
            }
            return cell
        }
    }()
}

extension CreateGroupVC: UICollectionViewDelegateFlowLayout {
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        guard dataSource.sectionModels.indices.contains(indexPath.section),
              dataSource.sectionModels[indexPath.section].items.indices.contains(indexPath.item) else {
            return CGSize(width: 52, height: 28)
        }
        return TagCell.preferredSize(for: dataSource[indexPath])
    }
}