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Model/Favorites/FavoritesModel.swift

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+import Defaults
+import Foundation
+
+struct FavoritesModel {
+    static let shared = Self()
+
+    @Default(.showFavoritesInHome) var showFavoritesInHome
+    @Default(.favorites) var all
+    @Default(.widgetsSettings) var widgetsSettings
+
+    var isEnabled: Bool {
+        showFavoritesInHome
+    }
+
+    func contains(_ item: FavoriteItem) -> Bool {
+        all.contains { $0 == item }
+    }
+
+    func toggle(_ item: FavoriteItem) {
+        contains(item) ? remove(item) : add(item)
+    }
+
+    func add(_ item: FavoriteItem) {
+        all.append(item)
+    }
+
+    func remove(_ item: FavoriteItem) {
+        if let index = all.firstIndex(where: { $0 == item }) {
+            all.remove(at: index)
+        }
+    }
+
+    func canMoveUp(_ item: FavoriteItem) -> Bool {
+        if let index = all.firstIndex(where: { $0 == item }) {
+            return index > all.startIndex
+        }
+
+        return false
+    }
+
+    func canMoveDown(_ item: FavoriteItem) -> Bool {
+        if let index = all.firstIndex(where: { $0 == item }) {
+            return index < all.endIndex - 1
+        }
+
+        return false
+    }
+
+    func moveUp(_ item: FavoriteItem) {
+        guard canMoveUp(item) else {
+            return
+        }
+
+        if let from = all.firstIndex(where: { $0 == item }) {
+            all.move(
+                fromOffsets: IndexSet(integer: from),
+                toOffset: from - 1
+            )
+        }
+    }
+
+    func moveDown(_ item: FavoriteItem) {
+        guard canMoveDown(item) else {
+            return
+        }
+
+        if let from = all.firstIndex(where: { $0 == item }) {
+            all.move(
+                fromOffsets: IndexSet(integer: from),
+                toOffset: from + 2
+            )
+        }
+    }
+
+    func addableItems() -> [FavoriteItem] {
+        let allItems = [
+            FavoriteItem(section: .subscriptions),
+            FavoriteItem(section: .popular),
+            FavoriteItem(section: .history)
+        ]
+
+        return allItems.filter { item in !all.contains { $0.section == item.section } }
+    }
+
+    func listingStyle(_ item: FavoriteItem) -> WidgetListingStyle {
+        widgetSettings(item).listingStyle
+    }
+
+    func limit(_ item: FavoriteItem) -> Int {
+        min(WidgetSettings.maxLimit(listingStyle(item)), widgetSettings(item).limit)
+    }
+
+    func setListingStyle(_ style: WidgetListingStyle, _ item: FavoriteItem) {
+        if let index = widgetsSettings.firstIndex(where: { $0.id == item.widgetSettingsKey }) {
+            var settings = widgetsSettings[index]
+            settings.listingStyle = style
+            widgetsSettings[index] = settings
+        } else {
+            let settings = WidgetSettings(id: item.widgetSettingsKey, listingStyle: style)
+            widgetsSettings.append(settings)
+        }
+    }
+
+    func setLimit(_ limit: Int, _ item: FavoriteItem) {
+        if let index = widgetsSettings.firstIndex(where: { $0.id == item.widgetSettingsKey }) {
+            var settings = widgetsSettings[index]
+            let limit = min(max(1, limit), WidgetSettings.maxLimit(settings.listingStyle))
+            settings.limit = limit
+            widgetsSettings[index] = settings
+        } else {
+            var settings = WidgetSettings(id: item.widgetSettingsKey, limit: limit)
+            let limit = min(max(1, limit), WidgetSettings.maxLimit(settings.listingStyle))
+            settings.limit = limit
+            widgetsSettings.append(settings)
+        }
+    }
+
+    func widgetSettings(_ item: FavoriteItem) -> WidgetSettings {
+        widgetsSettings.first { $0.id == item.widgetSettingsKey } ?? WidgetSettings(id: item.widgetSettingsKey)
+    }
+}