//
//  CommonControllerAutocomplete.swift
//  Wallet
//
//  Created by Igor on 10.02.2021.
//

import UIKit

class CommonControllerAutocomplete: UIViewController {
    
    @IBOutlet private weak var tableView: UITableView!
    @IBOutlet private weak var searchTxtFld: CommonTextFieldSearch!
    @IBOutlet private weak var height: NSLayoutConstraint!
    
    private let completion: (Common.Model.Menu) -> Void
    private let service: CommonMenuAutocompleteService
    private var collection = [Common.Model.Menu]()
    private var isLoading = false
    private var selected: Common.Model.Menu?
    
    init(
        image: UIImage? = nil,
        title: String? = nil,
        text: String? = nil,
        placeholder: String? = nil,
        service: CommonMenuAutocompleteService,
        selected: Common.Model.Menu? = nil,
        _ completion: @escaping (Common.Model.Menu) -> Void
    ) {
        self.service = service
        self.selected = selected
        self.completion = completion
        super.init(nibName: "CommonControllerAutocomplete", bundle: nil)
        self.title = title
        self.text = text
        self.image = image
        _ = view
        height.constant = 2*UIScreen.main.bounds.height/3
        view.layoutIfNeeded()
        searchTxtFld.lzPlaceholder = placeholder
        tableView.register(cell: CommonCellAutocomplete.self)
        service.didUpdate = {
            Loader.hide(in: self.tableView)
            self.collection = service.collection
            self.isLoading = false
            self.tableView.reloadData()
        }
        reload()
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        searchTxtFld.becomeFirstResponder()
    }
    
    private func reload() {
        isLoading = true
        tableView.reloadData()
        if !Loader.isLoading(in: tableView) {
            Loader.show(in: tableView)
        }
        service.apply(filter: searchTxtFld.text)
    }
    
}

extension CommonControllerAutocomplete: CommonTextFieldSearchDelegate {
    func textFieldDidChange(_ textField: CommonTextFieldSearch) {
        reload()
    }
}

extension CommonControllerAutocomplete: UITableViewDataSource, UITableViewDelegate {
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { isLoading ? 0 : collection.count }
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(CommonCellAutocomplete.self, indexPath: indexPath)
        cell.adjust(to: collection[indexPath.row], isSelected: selected == collection[indexPath.row])
        return cell
    }
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        selected = collection[indexPath.row]
        tableView.reloadData()
        dismiss(animated: true) { self.completion(self.collection[indexPath.row]) }
    }
}