import AppIntents
import Foundation

// Per-widget configuration intent (iOS 17+). Every widget instance carries
// its OWN fuel + sort choices, edited directly on the home screen (long-press
// → Edit Widget), independent of what the app has selected. This is what
// allows several FuelBoard widgets to show different fuels/orderings side by
// side.

enum WidgetFuel: String, AppEnum, CaseIterable, Codable {
    case e10
    case e5
    case diesel

    static var typeDisplayRepresentation: TypeDisplayRepresentation = "Fuel"

    static var caseDisplayRepresentations: [WidgetFuel: DisplayRepresentation] = [
        .e10: "Unleaded",
        .e5: "Premium",
        .diesel: "Diesel",
    ]
}

enum WidgetSort: String, AppEnum, CaseIterable, Codable {
    case cheapest
    case closest
    case favourites

    static var typeDisplayRepresentation: TypeDisplayRepresentation = "Sort by"

    static var caseDisplayRepresentations: [WidgetSort: DisplayRepresentation] = [
        .cheapest: "Cheapest",
        .closest: "Closest",
        .favourites: "Favourites",
    ]
}

enum WidgetDistance: String, AppEnum, CaseIterable, Codable {
    case five
    case ten
    case fifteen

    static var typeDisplayRepresentation: TypeDisplayRepresentation = "Distance"

    static var caseDisplayRepresentations: [WidgetDistance: DisplayRepresentation] = [
        .five: "5 miles",
        .ten: "10 miles",
        .fifteen: "15 miles",
    ]

    /// Mirror the app's units setting: the Edit-Widget picker labels show the
    /// real distance in the user's chosen unit — "5 miles" in miles mode,
    /// "8 km" in km mode (same stored value, labelled truthfully). Keeps the
    /// widget config consistent with the Stations/Alerts pickers.
    var displayRepresentation: DisplayRepresentation {
        let unit = FuelStore.loadDistanceUnit()
        let shown = unit.displayMiles(miles)
        return DisplayRepresentation(stringLiteral: "\(shown) \(unit.label(for: Double(shown)))")
    }

    var miles: Int {
        switch self {
        case .five: return 5
        case .ten: return 10
        case .fifteen: return 15
        }
    }
}

struct FuelBoardWidgetConfigurationIntent: WidgetConfigurationIntent {
    static var title: LocalizedStringResource = "Fuel & Sort"
    static var description = IntentDescription("Which fuel, ordering and search radius this widget shows.")

    @Parameter(title: "Fuel", default: .e10)
    var fuel: WidgetFuel

    @Parameter(title: "Sort by", default: .cheapest)
    var sort: WidgetSort

    @Parameter(title: "Distance", default: .five)
    var distance: WidgetDistance

    /// Edit-Widget UI: the Distance picker only makes sense for Cheapest
    /// ordering — Closest is inherently "nearest within range" and Favourites
    /// is not radius-bound. Show it for Cheapest only; hide for both others.
    static var parameterSummary: some ParameterSummary {
        When(\.$sort, .equalTo, WidgetSort.cheapest) {
            Summary("Show \(\.$fuel) by \(\.$sort) within \(\.$distance)") {
                \.$fuel
                \.$sort
                \.$distance
            }
        } otherwise: {
            When(\.$sort, .equalTo, WidgetSort.favourites) {
                Summary("Show \(\.$fuel) favourites") {
                    \.$fuel
                    \.$sort
                }
            } otherwise: {
                Summary("Show \(\.$fuel) by \(\.$sort)") {
                    \.$fuel
                    \.$sort
                }
            }
        }
    }
}