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

import Combine
import Core

class LocationsAddViewModel: ObservableObject {

    // MARK: Properties
    
    weak var coordinator: LocationsAddCoordination?
    
    @Published private var location: Location?
    @Published private var locationExists: Bool = false
    
    private let saveLocalLocation = SaveLocalLocationUseCase()

    // MARK: Initialisers
    
    init(coordinator: LocationsAddCoordination) {
        self.coordinator = coordinator
        
        setupBindings()
    }

}

// MARK: - LocationsAddViewModeling

extension LocationsAddViewModel: LocationsAddViewModeling {

    // MARK: Properties
    
    var locationExistsPublisher: Published<Bool>.Publisher { $locationExists }
    
    // MARK: Functions
    
    func cleanLocation() {
        location = nil
    }
    
    func saveLocation() {
        guard let location else {
            return
        }
        
        saveLocalLocation(
            latitude: location.latitude,
            longitude: location.longitude
        )
        
        coordinator?.closeLocationsAddScreen()
    }
    
    func setLocation(latitude: Float, longitude: Float) {
        if location == nil {
            location = .init(latitude: latitude, longitude: longitude)
        } else {
            location?.latitude = latitude
            location?.longitude = longitude
        }
    }

}

// MARK: - Helpers

private extension LocationsAddViewModel {
    
    // MARK: Functions
    
    func setupBindings() {
        $location
            .map { $0 != nil }
            .assign(to: &$locationExists)
    }
}

// MARK: - Structs

private extension LocationsAddViewModel {
    struct Location {
        var latitude: Float
        var longitude: Float
    }
}