//
//  LocationsAddViewController.swift
//  Locations
//
//  Created by Javier Cicchelli on 11/04/2023.
//  Copyright © 2023 Röck+Cöde. All rights reserved.
//

import Combine
import Core
import UIKit
import MapKit

class LocationsAddViewController: BaseViewController {
    
    // MARK: Properties
    
    private let viewModel: LocationsAddViewModeling
    
    private var cancellables: Set<AnyCancellable> = []
    
    // MARK: Outlets
    
    private lazy var map = {
        let map = MKMapView()

        map.translatesAutoresizingMaskIntoConstraints = false
        
        map.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(tapOnMap)))
        
        return map
    }()
    
    // MARK: Initialisers
    
    init(viewModel: LocationsAddViewModeling) {
        self.viewModel = viewModel
        
        super.init()
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    // MARK: UIViewController

    override func viewDidLoad() {
        super.viewDidLoad()
        
        setupBar()
        setupView()
        bindViewModel()
    }
    
}

// MARK: - Helpers

private extension LocationsAddViewController {
    
    // MARK: Functions
    
    func bindViewModel() {
        viewModel
            .locationExistsPublisher
            .receive(on: RunLoop.main)
            .sink { locationExists in
                self.navigationItem
                    .rightBarButtonItems?
                    .forEach { $0.isEnabled = locationExists }
            }
            .store(in: &cancellables)
    }
    
    func setupBar() {
        title = "Add a location"
        navigationController?.navigationBar.prefersLargeTitles = false
        navigationController?.navigationBar.backgroundColor = .systemBackground
        navigationController?.navigationBar.isTranslucent = true
        navigationController?.navigationBar.tintColor = .red
        navigationItem.rightBarButtonItems = [
            .init(
                title: "Save",
                style: .plain,
                target: self,
                action: #selector(saveButtonPressed)
            ),
            .init(
                title: "Clean",
                style: .plain,
                target: self,
                action: #selector(cleanButtonPressed)
            ),
        ]
    }
    
    func setupView() {
        view.addSubview(map)
                
        NSLayoutConstraint.activate([
            view.bottomAnchor.constraint(equalTo: map.bottomAnchor),
            view.leadingAnchor.constraint(equalTo: map.leadingAnchor),
            view.topAnchor.constraint(equalTo: map.topAnchor),
            view.trailingAnchor.constraint(equalTo: map.trailingAnchor),
        ])
    }

    // MARK: Actions

    @objc func cleanButtonPressed() {
        map.removeAnnotations(map.annotations)
        
        viewModel.cleanLocation()
    }
    
    @objc func saveButtonPressed() {
        viewModel.saveLocation()
    }
    
    @objc func tapOnMap(recognizer: UITapGestureRecognizer) {
        let tapOnView = recognizer.location(in: map)
        let mapCoordinates = map.convert(tapOnView, toCoordinateFrom: map)
        let annotation = MKPointAnnotation()

        annotation.coordinate = mapCoordinates
        
        map.removeAnnotations(map.annotations)
        map.addAnnotation(annotation)
        map.setCenter(mapCoordinates, animated: true)
        
        viewModel.setLocation(
            latitude: Float(mapCoordinates.latitude),
            longitude: Float(mapCoordinates.longitude)
        )
    }
    
}