/**
 * TrackerMap
 * Copyright (C) 2021-2022  Iván Ávalos <avalos@disroot.org>, Henoch Ojeda <imhenoch@protonmail.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
import Foundation
import WhirlyGlobe
import shared

class UnitsViewModel: ObservableObject {
    @Inject var unitsController: UnitsController
    @Inject var geofenceController: GeofencesController
    
    let mainScope = MainScope.companion.createMainScope()
    
    enum UnitsDisplayMode {
        case map
        case list
    }
    
    class Camera {
        let point: MaplyCoordinate?
        let height: Float?
        
        init(_ point: MaplyCoordinate? = nil,
             height: Float? = nil) {
            self.point = point
            self.height = height
        }
    }
    
    @Published var searchQuery = "" {
        didSet {
            unitsDisplayMode = .list
            search(query: searchQuery)
        }
    }
    @Published var isEditing = false
    @Published var unitsDisplayMode: UnitsDisplayMode = .list
    @Published var units: [UnitInformation] = [] {
        didSet {
            markers = units.compactMap(Marker.companion.fromUnit)
        }
    }
    @Published var markers: [Marker] = []
    @Published var selectedUnit: UnitInformation? = nil {
        didSet {
            if let unit = selectedUnit {
                selectedMarker = Marker.companion.fromUnit(unit: unit)
            } else {
                selectedMarker = nil
            }
        }
    }
    @Published var selectedMarker: Marker? = nil
    @Published var mapLayerType: MapLayer = .companion.defaultLayer
    @Published var geofences: [Int: Geofence] = [:]
    @Published var camera: Camera = Camera()
    
    init() {
        unitsController.fetchUnits(scope: mainScope)
        setupObservers()
    }
    
    deinit {
        MainScope.companion.cancelScope(scope: mainScope)
    }
    
    private func setupObservers() {
        let unitsCollector = Collector<[UnitInformation]>(callback: setUnits)
        unitsController.displayedUnitsFlow.collect(collector: unitsCollector) { unit, error in }
        
        let geofencesCollector = Collector<[Int: Geofence]>(callback: setGeofences)
        geofenceController.geofencesFlow.collect(collector: geofencesCollector) { unit, error in }
    }
    
    private func setUnits(units: [UnitInformation]) {
        print("Positions")
        self.units = units
    }
    
    private func setGeofences(geofences: [Int: Geofence]) {
        self.geofences = geofences
    }
    
    func selectUnitWith(position id: Int32?) {
        if id == nil {
            print("Deselecting unit")
            selectedUnit = nil
            return
        }
        print("Selecting unit with position id: \(id ?? 0)")
        if let unit = units.first(where: {
            Int32(truncating: $0.position?.id ?? 0) == id
        }) {
            selectedUnit = unit
        }
    }
    
    func toggleDisplayMode() {
        switch unitsDisplayMode {
        case .map:
            unitsDisplayMode = .list
        case .list:
            unitsDisplayMode = .map
        }
    }
    
    func search(query: String) {
        unitsController.search(query: query)
    }
}