import SwiftUI

extension BolusCalculatorConfig {
    final class StateModel: BaseStateModel<Provider> {
        @Published var units: GlucoseUnits = .mgdL
        @Published var overrideFactor: Decimal = 0
        @Published var fattyMeals: Bool = false
        @Published var fattyMealFactor: Decimal = 0
        @Published var sweetMeals: Bool = false
        @Published var sweetMealFactor: Decimal = 0
        @Published var displayPresets: Bool = true

        override func subscribe() {
            units = settingsManager.settings.units

            subscribeSetting(\.overrideFactor, on: $overrideFactor, initial: {
                let value = max(min($0, 1.2), 0.1)
                overrideFactor = value
            }, map: {
                $0
            })
            subscribeSetting(\.fattyMeals, on: $fattyMeals) { fattyMeals = $0 }
            subscribeSetting(\.displayPresets, on: $displayPresets) { displayPresets = $0 }
            subscribeSetting(\.fattyMealFactor, on: $fattyMealFactor, initial: {
                let value = max(min($0, 1.2), 0.1)
                fattyMealFactor = value
            }, map: {
                $0
            })
            subscribeSetting(\.sweetMeals, on: $sweetMeals) { sweetMeals = $0 }
            subscribeSetting(\.sweetMealFactor, on: $sweetMealFactor, initial: {
                let value = max(min($0, 5), 1)
                sweetMealFactor = value
            }, map: {
                $0
            })
        }
    }
}

extension BolusCalculatorConfig.StateModel: SettingsObserver {
    func settingsDidChange(_: FreeAPSSettings) {
        units = settingsManager.settings.units
    }
}