//
//  AppUsageReportVC.swift
//  QuickLocation
//

import UIKit
import RxSwift
import RxCocoa
import ObjectMapper

final class AppUsageReportVC: BaseViewController {

    private var rootView: AppUsageReportView!
    private let viewModel: AppUsageReportViewModel

    init(members: [GroupMemberModel], selectedUserId: String, groupModel: GroupModel?) {
        viewModel = AppUsageReportViewModel(
            members: members,
            selectedUserId: selectedUserId,
            groupKey: groupModel?.default_group_key ?? ""
        )
        super.init(nibName: nil, bundle: nil)
    }

    convenience init(userInfo: [String: Any]) {
        let membersJson: [[String: Any]]
        if let members = userInfo["members"] as? [[String: Any]] {
            membersJson = members
        } else if let members = userInfo["members"] as? [Any] {
            membersJson = members.compactMap { $0 as? [String: Any] }
        } else {
            membersJson = []
        }
        let members = membersJson.compactMap { GroupMemberModel(JSON: $0) }
        let selectedUserId = (userInfo["userId"] as? String) ?? members.first?.user_id ?? ""
        let groupModel = (userInfo["groupJson"] as? [String: Any]).flatMap { GroupModel(JSON: $0) }
        self.init(members: members, selectedUserId: selectedUserId, groupModel: groupModel)
    }

    required init?(coder: NSCoder) { fatalError("init(coder:) has not been implemented") }

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

    override func viewDidLoad() {
        super.viewDidLoad()
        rootView.memberCV.dataSource = self
        rootView.memberCV.delegate = self
        bind()
        rootView.memberCV.reloadData()
    }

    private func bind() {
        rootView.navView.onBackTapped = { [weak self] in
            self?.navigationController?.popViewController(animated: true)
        }
        rootView.onPeriodChanged = { [weak self] period in
            self?.viewModel.selectedPeriod.accept(period)
        }
        viewModel.selectedMemberId
            .observe(on: MainScheduler.instance)
            .subscribe(onNext: { [weak self] _ in
                self?.rootView.memberCV.reloadData()
            })
            .disposed(by: disposeBag)
        viewModel.snapshot
            .observe(on: MainScheduler.instance)
            .subscribe(onNext: { [weak self] snapshot in
                self?.rootView.apply(snapshot)
            })
            .disposed(by: disposeBag)
    }
}

extension AppUsageReportVC: UICollectionViewDataSource, UICollectionViewDelegate {
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        viewModel.members.count
    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell: GroupMemberListCell = collectionView.dequeueReusableCell(for: indexPath)
        let member = viewModel.members[indexPath.item]
        cell.configure(
            model: member,
            isCurrentUser: member.user_id == AppContextManager.shared.userId,
            isSelected: member.user_id == viewModel.selectedMemberId.value
        )
        return cell
    }

    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        viewModel.selectedMemberId.accept(viewModel.members[indexPath.item].user_id)
    }
}