//
//  GroupViewController.swift
//  QuickLocation
//

import UIKit
import RxSwift
import RxCocoa
import RxDataSources

final class GroupViewController: BaseViewController {

    override var isNavigationBarHidden: Bool { true }

    fileprivate var rootView: GroupView!
    private let viewModel = GroupViewModel()

    override func loadView() {
        rootView = GroupView(frame: UIScreen.main.bounds)
        view = rootView
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        bindViewModel()
        reactiveAction()
        observeTableViews()
        
        viewModel.loadMockData()
    }

    // MARK: - Bindings
    private func bindViewModel() {
        // 热门酷圈
        viewModel.output.hotGroups
            .drive(rootView.hotGroupsCollectionView.rx.items(
                cellIdentifier: HotGroupCell.reuseId,
                cellType: HotGroupCell.self
            )) { _, item, cell in
                cell.configure(item)
            }
            .disposed(by: disposeBag)

        // 我创建的圈子
        let createdDataSource = RxTableViewSectionedReloadDataSource<CircleListSectionModel>(
            configureCell: { (_, tableView, indexPath, model) in
                let cell: CircleGroupCell = tableView.dequeueReusableCell(for: indexPath)
                cell.configure(model)
                return cell
            })

        viewModel.output.createdSections
            .bind(to: rootView.createdTableView.rx.items(dataSource: createdDataSource))
            .disposed(by: disposeBag)

        // 我加入的圈子
        let joinedDataSource = RxTableViewSectionedReloadDataSource<CircleListSectionModel>(
            configureCell: { (_, tableView, indexPath, model) in
                let cell: CircleGroupCell = tableView.dequeueReusableCell(for: indexPath)
                cell.configure(model)
                return cell
            })

        viewModel.output.joinedSections
            .bind(to: rootView.joinedTableView.rx.items(dataSource: joinedDataSource))
            .disposed(by: disposeBag)
    }

    private func reactiveAction() {
        rootView.createGroupBtn.rx.tapGesture
            .subscribe(onNext: { _ in
                // TODO: 创建圈子
            })
            .disposed(by: disposeBag)

        rootView.joinGroupBtn.rx.tapGesture
            .subscribe(onNext: { _ in
                // TODO: 加入圈子
            })
            .disposed(by: disposeBag)

        rootView.createdTabLabel.rx.tapGesture
            .subscribe(onNext: { [weak self] _ in self?.switchToSegment(0) })
            .disposed(by: disposeBag)

        rootView.joinedTabLabel.rx.tapGesture
            .subscribe(onNext: { [weak self] _ in self?.switchToSegment(1) })
            .disposed(by: disposeBag)
    }

    private func switchToSegment(_ index: Int) {
        rootView.selectSegment(at: index)
        let offset = CGPoint(x: CGFloat(index) * rootView.segmentScrollView.bounds.width, y: 0)
        rootView.segmentScrollView.setContentOffset(offset, animated: false)
    }

    // MARK: - 内层 tableView 滚动 → 转发给 GroupView 处理吸顶脱离
    private func observeTableViews() {
        rootView.createdTableView.rx.didScroll
            .subscribe(onNext: { [weak self] in
                guard let self = self else { return }
                self.rootView.handleTableViewScroll(self.rootView.createdTableView)
            })
            .disposed(by: disposeBag)

        rootView.joinedTableView.rx.didScroll
            .subscribe(onNext: { [weak self] in
                guard let self = self else { return }
                self.rootView.handleTableViewScroll(self.rootView.joinedTableView)
            })
            .disposed(by: disposeBag)
    }
}