/*
* SearchViewModel on iOS that renders states emitted by the state machine.
* This code lives in the iOS project.
*/
class SearchViewController: UIViewController, UISearchBarDelegate, UITableViewDelegate, UITableViewDataSource {
    
    private let reuseIdentifier = "SearchTableViewCell"
    private var viewModel: KSearchViewModel? = nil
    
    var filterViewController: FilterViewController? = nil
    
    var tableView: UITableView!
    var searchBar: UISearchBar!
    var searchResults: [SearchResult] = []
    var searchActive: Bool = false
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        analytics.trackEvent(AE.VIEW_SEARCH)
        
        filterViewController = FilterViewController()
        
        self.navigationItem.rightBarButtonItem = UIBarButtonItem(customView: self.makeFilterButton())
        
        tableView = UITableView()
        tableView.register(SearchTableViewCell.self, forCellReuseIdentifier: "searchTableViewCell")
        searchBar = UISearchBar()
        view.addSubview(tableView)
        tableView.frame = view.frame
        navigationItem.titleView = searchBar
        searchBar.translatesAutoresizingMaskIntoConstraints = false
        searchBar.leadingAnchor.constraint(equalTo: view.leadingAnchor)
        searchBar.topAnchor.constraint(equalTo: view.topAnchor)
        
        applyBlueTheme()
        
        searchBar.delegate = self
        tableView.dataSource = self
        tableView.delegate = self
        self.navigationItem.leftBarButtonItem = UIBarButtonItem(customView: makeBackButton())
        
        viewModel = KSearchViewModel(exitDb: kotlinDb)
        viewModel!.cStateFlow.watch { state in
            self.render(state: state!)
        }
        filterViewController?.attachViewModel(viewModel: viewModel!)
    }
    
    func releaseReferences() {
        viewModel?.clear()
        filterViewController = nil
        viewModel = nil
    }
    
    func render(state: Search.State) {
        switch(state.type) {
        case .initialstate:
            print("initial state")
        case .filteroptionsloaded:
            filterViewController?.setCountryList(countryList: state.filterOptions.filterCountryList)
        case .closefilterstate:
            print("close filter state")
            filterViewController?.dismiss(animated: true, completion: nil)
        case .openfilterstate:
            print("open filter test")
            filterViewController?.attachViewModel(viewModel: viewModel!)
            guard let controller = filterViewController else { return }
            controller.modalPresentationStyle = .fullScreen
            self.present(controller, animated: true, completion: nil)
        case .showresultsstate:
            print("show results state")
            self.searchResults = state.items
            self.tableView.reloadData()
        case .closepagestate:
            print("close page state")
        default:
            print("should never get here")
        }
    }

    func makeFilterButton() -> UIButton {
        let backButtonImage = UIImage(named: "backbutton")?.withRenderingMode(.alwaysTemplate)
        let filterBtn = UIButton(type: .custom)
        filterBtn.setImage(backButtonImage, for: .normal)
        filterBtn.tintColor = UIColor(named: "MainText")
        filterBtn.setTitle("Filter", for: .normal)
        filterBtn.setTitleColor(UIColor(named: "MainText"), for: .normal)
        filterBtn.addTarget(self, action: #selector(dispatchOpenFilter), for: .touchUpInside)
        return filterBtn
    }
    
    @objc func dispatchOpenFilter() {
        self.viewModel!.dispatchAction(action: Search.ActionTapOpenFilterIcon())
    }
    
    @objc func backButtonPressed() {
        dismiss(animated: true, completion: nil)
        releaseReferences()
    }
    
    override func viewDidAppear(_ animated: Bool) {
        self.tableView.reloadData()
    }
    
    func numberOfSectionsInTableView(tableView: UITableView) -> Int {
        return 1;
    }
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return searchResults.count;
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "searchTableViewCell", for: indexPath) as! SearchTableViewCell
        let currExit = self.searchResults[indexPath.row]
        cell.descriptionLabel.attributedText = makeExitListText(exit: currExit)
        return cell
    }
    
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        tableView.deselectRow(at: indexPath, animated: true)
        let controller = ExitViewController()
        let currExit = self.searchResults[indexPath.row]
        //controller.exit = allExits[currExit.name] as! Exit!
        controller.exitId = currExit._id
        let uiNavController = UINavigationController(rootViewController: controller)
        uiNavController.modalPresentationStyle = .fullScreen
        self.present(uiNavController, animated: true, completion: nil)
    }
    
    func populateResults(_ exitList: [SearchResult]) {
        searchResults = exitList
        self.tableView.reloadData()
    }
    
    func searchBar(_ searchBar: UISearchBar,
                   textDidChange searchText: String) {
        self.searchResults.removeAll()
        viewModel?.dispatchAction(
            action: Search.ActionQueryChangeAction(
                filterState: filterViewController!.generateFilterState(),
                query: searchText
            )
        )
        self.tableView.reloadData()
    }
    
    override var prefersStatusBarHidden: Bool {
        return true
    }
}