import Foundation

/// Which days and which meals a given week is planned with. Until 2.1.1 this
/// came straight from `AppSettings` and applied to the whole calendar; a week
/// can now override it (premium), e.g. add the weekend for a trip or turn on
/// breakfast just for the school week.
struct WeekSchedule: Equatable {
    let mealTypes: [MealType]
    let includeWeekends: Bool
    /// True when the values come from a per-week override rather than settings.
    let isCustomized: Bool

    var dayRange: ClosedRange<Int> { includeWeekends ? 0...6 : 0...4 }
    var lastDay: Int { includeWeekends ? 6 : 4 }
}

extension AppSettings {
    /// The schedule applied to every week that has no override of its own.
    var defaultSchedule: WeekSchedule {
        WeekSchedule(mealTypes: activeMealTypes, includeWeekends: includeWeekends, isCustomized: false)
    }

    /// Resolved schedule for a week: its own override when present, the global
    /// settings otherwise.
    ///
    /// Existing overrides are honoured even when `isPremium` is false — a lapsed
    /// subscription must not silently delete slots the user already filled.
    /// Creating or editing an override is what premium gates (see
    /// `PremiumAccess.canCustomizeWeekSchedule`).
    func schedule(for plan: WeekPlan?) -> WeekSchedule {
        guard let plan, plan.hasScheduleOverride else { return defaultSchedule }
        return WeekSchedule(
            mealTypes: plan.mealTypesOverride ?? activeMealTypes,
            includeWeekends: plan.includeWeekendsOverride ?? includeWeekends,
            isCustomized: true
        )
    }
}