Add About screen

Packages/TTTKit/.gitignore

@@ -0,0 +1,9 @@
+.DS_Store
+/.build
+/Packages
+/*.xcodeproj
+xcuserdata/
+DerivedData/
+.swiftpm/config/registries.json
+.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
+.netrc

Packages/TTTKit/Package.swift

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+// swift-tools-version: 5.7
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "TTTKit",
+    platforms: [
+        .iOS(.v15),
+    ],
+    products: [
+        // Products define the executables and libraries a package produces, and make them visible to other packages.
+        .library(
+            name: "TTTKit",
+            targets: ["TTTKit"]),
+    ],
+    dependencies: [
+        // Dependencies declare other packages that this package depends on.
+        // .package(url: /* package url */, from: "1.0.0"),
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
+        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        .target(
+            name: "TTTKit",
+            dependencies: []),
+        .testTarget(
+            name: "TTTKitTests",
+            dependencies: ["TTTKit"]),
+    ]
+)

Packages/TTTKit/README.md

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+# TTTKit
+
+A description of this package.

Packages/TTTKit/Sources/TTTKit/AI/GameModel.swift

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+//
+//  GameModel.swift
+//  TTTKit
+//
+//  Created by Shadowfacts on 12/21/22.
+//
+
+import Foundation
+import GameKit
+
+public class GameModel: NSObject, NSCopying, GKGameModel {
+    private var controller: GameController
+    
+    public init(controller: GameController) {
+        self.controller = controller
+    }
+    
+    // MARK: GKGameModel
+    
+    public var players: [GKGameModelPlayer]? {
+        [Player.x, Player.o]
+    }
+    
+    public var activePlayer: GKGameModelPlayer? {
+        switch controller.state {
+        case .playAnywhere(let mark), .playSpecific(let mark, column: _, row: _):
+            switch mark {
+            case .x:
+                return Player.x
+            case .o:
+                return Player.o
+            }
+        case .end(_):
+            return nil
+        }
+    }
+    
+    public func setGameModel(_ gameModel: GKGameModel) {
+        let other = (gameModel as! GameModel).controller
+        self.controller = GameController(state: other.state, board: other.board)
+    }
+    
+    public func gameModelUpdates(for player: GKGameModelPlayer) -> [GKGameModelUpdate]? {
+        guard let player = player as? Player else {
+            return nil
+        }
+        let mark = player.mark
+        
+        switch controller.state {
+        case .playAnywhere:
+            return updatesForPlayAnywhere(mark: mark)
+        case .playSpecific(_, column: let col, row: let row):
+            return updatesForPlaySpecific(mark: mark, board: (col, row))
+        case .end:
+            return nil
+        }
+    }
+    
+    public func apply(_ gameModelUpdate: GKGameModelUpdate) {
+        let update = gameModelUpdate as! Update
+        switch controller.state {
+        case .playAnywhere(update.mark), .playSpecific(update.mark, column: update.subBoard.column, row: update.subBoard.row):
+            break
+        default:
+            fatalError()
+        }
+        controller.play(on: update.subBoard, column: update.column, row: update.row)
+    }
+    
+    public func score(for player: GKGameModelPlayer) -> Int {
+        guard let player = player as? Player else {
+            return .min
+        }
+        
+        var score = 0
+        for column in 0..<3 {
+            for row in 0..<3 {
+                let subBoard = controller.board.getSubBoard(column: column, row: row)
+                if let win = subBoard.win {
+                    if win.mark == player.mark {
+                        score += 10
+                    } else {
+                        score -= 5
+                    }
+                } else {
+                    score += 4 * subBoard.potentialWinCount(for: player.mark)
+                    score -= 2 * subBoard.potentialWinCount(for: player.mark.next)
+                }
+            }
+        }
+        if case .playAnywhere(let mark) = controller.state {
+            if mark == player.mark {
+                score += 5
+            }
+        }
+        score += 8 * controller.board.potentialWinCount(for: player.mark)
+        score -= 4 * controller.board.potentialWinCount(for: player.mark.next)
+        return score
+    }
+    
+    public func isWin(for player: GKGameModelPlayer) -> Bool {
+        let mark = (player as! Player).mark
+        return controller.board.win?.mark == mark
+    }
+    
+    private func updatesForPlayAnywhere(mark: Mark) -> [Update] {
+        var updates = [Update]()
+        for boardColumn in 0..<3 {
+            for boardRow in 0..<3 {
+                let subBoard = controller.board.getSubBoard(column: boardColumn, row: boardRow)
+                guard !subBoard.ended else { continue }
+                
+                for column in 0..<3 {
+                    for row in 0..<3 {
+                        guard subBoard[column, row] == nil else { continue }
+                        updates.append(Update(mark: mark, subBoard: (boardColumn, boardRow), column: column, row: row))
+                    }
+                }
+            }
+        }
+        return updates
+    }
+    
+    private func updatesForPlaySpecific(mark: Mark, board: (column: Int, row: Int)) -> [Update] {
+        let subBoard = controller.board.getSubBoard(column: board.column, row: board.row)
+        var updates = [Update]()
+        for column in 0..<3 {
+            for row in 0..<3 {
+                guard subBoard[column, row] == nil else { continue }
+                updates.append(Update(mark: mark, subBoard: board, column: column, row: row))
+            }
+        }
+        return updates
+    }
+    
+    // MARK: NSCopying
+    
+    public func copy(with zone: NSZone? = nil) -> Any {
+        return GameModel(controller: GameController(state: controller.state, board: controller.board))
+    }
+    
+}
+
+extension Board {
+    func potentialWinCount(for mark: Mark) -> Int {
+        return Win.allPoints.filter { points in
+            let empty = points.filter { self[$0] == nil }.count
+            let matching = points.filter { self[$0] == mark }.count
+            return matching == 2 && empty == 1
+        }.count
+    }
+}

Packages/TTTKit/Sources/TTTKit/AI/Player.swift

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+//
+//  Player.swift
+//  TTTKit
+//
+//  Created by Shadowfacts on 12/21/22.
+//
+
+import Foundation
+import GameKit
+
+class Player: NSObject, GKGameModelPlayer {
+    static let x = Player(playerId: 0)
+    static let o = Player(playerId: 1)
+    
+    let playerId: Int
+    
+    var mark: Mark {
+        playerId == 0 ? .x : .o
+    }
+    
+    private init(playerId: Int) {
+        self.playerId = playerId
+    }
+}

Packages/TTTKit/Sources/TTTKit/AI/Update.swift

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+//
+//  Update.swift
+//  TTTKit
+//
+//  Created by Shadowfacts on 12/21/22.
+//
+
+import Foundation
+import GameKit
+
+class Update: NSObject, GKGameModelUpdate {
+    let mark: Mark
+    let subBoard: (column: Int, row: Int)
+    let column: Int
+    let row: Int
+    
+    init(mark: Mark, subBoard: (Int, Int), column: Int, row: Int) {
+        self.mark = mark
+        self.subBoard = subBoard
+        self.column = column
+        self.row = row
+    }
+    
+    var value: Int = 0
+}

Packages/TTTKit/Sources/TTTKit/Logic/GameController.swift

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+//
+//  GameController.swift
+//  TTTKit
+//
+//  Created by Shadowfacts on 12/21/22.
+//
+
+import Foundation
+
+public class GameController: ObservableObject {
+    
+    @Published public private(set) var state: State
+    @Published public private(set) var board: SuperTicTacToeBoard
+    
+    public init() {
+        self.state = .playAnywhere(.x)
+        self.board = SuperTicTacToeBoard()
+    }
+    
+    init(state: State, board: SuperTicTacToeBoard) {
+        self.state = state
+        self.board = board
+    }
+    
+    public func play(on subBoard: (column: Int, row: Int), column: Int, row: Int) {
+        guard board.getSubBoard(column: subBoard.column, row: subBoard.row)[column, row] == nil else {
+            return
+        }
+        let activePlayer: Mark
+        switch state {
+        case .playAnywhere(let mark):
+            activePlayer = mark
+        case .playSpecific(let mark, column: subBoard.column, row: subBoard.row):
+            activePlayer = mark
+        default:
+            return
+        }
+        
+        board.play(mark: activePlayer, subBoard: subBoard, column: column, row: row)
+        
+        if let win = board.win {
+            state = .end(.won(win))
+        } else if board.tied {
+            state = .end(.tie)
+        } else {
+            let nextSubBoard = board.getSubBoard(column: column, row: row)
+            if nextSubBoard.ended {
+                state = .playAnywhere(activePlayer.next)
+            } else {
+                state = .playSpecific(activePlayer.next, column: column, row: row)
+            }
+        }
+    }
+    
+    private func canPlay(on subBoard: (column: Int, row: Int)) -> Bool {
+        switch state {
+        case .playAnywhere(_):
+            return true
+        case .playSpecific(_, column: subBoard.column, row: subBoard.row):
+            return true
+        default:
+            return false
+        }
+    }
+    
+}
+
+public extension GameController {
+    enum State {
+        case playAnywhere(Mark)
+        case playSpecific(Mark, column: Int, row: Int)
+        case end(Result)
+        
+        public var displayName: String {
+            switch self {
+            case .playAnywhere(_):
+                return "Play anywhere"
+            case .playSpecific(_, column: let col, row: let row):
+                switch (col, row) {
+                case (0, 0):
+                    return "Play in the top left"
+                case (1, 0):
+                    return "Play in the top middle"
+                case (2, 0):
+                    return "Play in the top right"
+                case (0, 1):
+                    return "Play in the middle left"
+                case (1, 1):
+                    return "Play in the center"
+                case (2, 1):
+                    return "Play in the middle right"
+                case (0, 2):
+                    return "Play in the bottom left"
+                case (1, 2):
+                    return "Play in the bottom middle"
+                case (2, 2):
+                    return "Play in the bottom right"
+                default:
+                    fatalError()
+                }
+            case .end(.tie):
+                return "It's a tie!"
+            case .end(.won(let win)):
+                switch win.mark {
+                case .x:
+                    return "X wins!"
+                case .o:
+                    return "O wins!"
+                }
+            }
+        }
+    }
+}
+
+public extension GameController {
+    enum Result {
+        case won(Win)
+        case tie
+    }
+}

Packages/TTTKit/Sources/TTTKit/Model/Board.swift

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+//
+//  Board.swift
+//  TTTKit
+//
+//  Created by Shadowfacts on 12/21/22.
+//
+
+import Foundation
+
+public protocol Board {
+    subscript(_ column: Int, _ row: Int) -> Mark? { get }
+}
+
+extension Board {
+    subscript(_ point: (column: Int, row: Int)) -> Mark? {
+        get {
+            self[point.column, point.row]
+        }
+    }
+    
+    public var full: Bool {
+        for column in 0..<3 {
+            for row in 0..<3 {
+                if self[column, row] == nil {
+                    return false
+                }
+            }
+        }
+        return true
+    }
+    
+    public var win: Win? {
+        for points in Win.allPoints {
+            if let mark = self[points[0]],
+               self[points[1]] == mark && self[points[2]] == mark {
+                return Win(mark: mark, points: points)
+            }
+        }
+        return nil
+    }
+    
+    public var won: Bool {
+        win != nil
+    }
+    
+    public var tied: Bool {
+        full && !won
+    }
+    
+    public var ended: Bool {
+        won || tied
+    }
+}

Packages/TTTKit/Sources/TTTKit/Model/Mark.swift

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+//
+//  Mark.swift
+//  TTTKit
+//
+//  Created by Shadowfacts on 12/21/22.
+//
+
+import Foundation
+
+public enum Mark {
+    case x, o
+    
+    public var next: Mark {
+        switch self {
+        case .x:
+            return .o
+        case .o:
+            return .x
+        }
+    }
+}

Packages/TTTKit/Sources/TTTKit/Model/SuperTicTacToeBoard.swift

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+//
+//  SuperTicTacToeBoard.swift
+//  TTTKit
+//
+//  Created by Shadowfacts on 12/21/22.
+//
+
+import Foundation
+
+public struct SuperTicTacToeBoard: Board {
+    
+    private var boards: [[TicTacToeBoard]] = [
+        [TicTacToeBoard(), TicTacToeBoard(), TicTacToeBoard()],
+        [TicTacToeBoard(), TicTacToeBoard(), TicTacToeBoard()],
+        [TicTacToeBoard(), TicTacToeBoard(), TicTacToeBoard()],
+    ]
+    
+    public subscript(_ column: Int, _ row: Int) -> Mark? {
+        get {
+            getSubBoard(column: column, row: row).win?.mark
+        }
+    }
+    
+    public func getSubBoard(column: Int, row: Int) -> TicTacToeBoard {
+        return boards[row][column]
+    }
+    
+    public mutating func play(mark: Mark, subBoard: (column: Int, row: Int), column: Int, row: Int) {
+        boards[subBoard.row][subBoard.column].play(mark: mark, column: column, row: row)
+    }
+    
+}

Packages/TTTKit/Sources/TTTKit/Model/TicTacToeBoard.swift

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+//
+//  TicTacToeBoard.swift
+//  TTTKit
+//
+//  Created by Shadowfacts on 12/21/22.
+//
+
+import Foundation
+
+public struct TicTacToeBoard: Board {
+    private var marks: [[Mark?]] = [
+        [nil, nil, nil],
+        [nil, nil, nil],
+        [nil, nil, nil],
+    ]
+    
+    init() {
+    }
+    
+    init(marks: [[Mark?]]) {
+        precondition(marks.count == 3)
+        precondition(marks.allSatisfy { $0.count == 3 })
+        self.marks = marks
+    }
+    
+    public subscript(_ column: Int, _ row: Int) -> Mark? {
+        get {
+            marks[row][column]
+        }
+    }
+    
+    public func canPlay(column: Int, row: Int) -> Bool {
+        return self[column, row] == nil
+    }
+    
+    public mutating func play(mark: Mark, column: Int, row: Int) {
+        marks[row][column] = mark
+    }
+}

Packages/TTTKit/Sources/TTTKit/Model/Win.swift

@@ -0,0 +1,24 @@
+//
+//  Win.swift
+//  TTTKit
+//
+//  Created by Shadowfacts on 12/21/22.
+//
+
+import Foundation
+
+public struct Win {
+    public let mark: Mark
+    public let points: [(column: Int, row: Int)]
+    
+    static let allPoints: [[(Int, Int)]] = [
+        [(0, 0), (1, 1), (2, 2)], // top left diag
+        [(2, 0), (1, 1), (0, 2)], // top right diag
+        [(0, 0), (1, 0), (2, 0)], // top row
+        [(0, 1), (1, 1), (2, 1)], // middle row
+        [(0, 2), (1, 2), (2, 2)], // bottom row
+        [(0, 0), (0, 1), (0, 2)], // left col
+        [(1, 0), (1, 1), (1, 2)], // middle col
+        [(2, 0), (2, 1), (2, 2)], // right col
+    ]
+}

Packages/TTTKit/Sources/TTTKit/UI/BoardView.swift

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+//
+//  BoardView.swift
+//  TTTKit
+//
+//  Created by Shadowfacts on 12/21/22.
+//
+
+import SwiftUI
+
+@available(iOS 16.0, *)
+struct BoardView<Cell: View>: View {
+    let board: any Board
+    @Binding var cellSize: CGFloat
+    let spacing: CGFloat
+    let cellProvider: (_ column: Int, _ row: Int) -> Cell
+    
+    init(board: any Board, cellSize: Binding<CGFloat>, spacing: CGFloat, @ViewBuilder cellProvider: @escaping (Int, Int) -> Cell) {
+        self.board = board
+        self._cellSize = cellSize
+        self.spacing = spacing
+        self.cellProvider = cellProvider
+    }
+    
+    var body: some View {
+        ZStack {
+            if let win = board.win {
+                winOverlay(win)
+            }
+            
+            Grid(horizontalSpacing: 10, verticalSpacing: 10) {
+                GridRow {
+                    cellProvider(0, 0)
+                        .background(GeometryReader { proxy in
+                            Color.clear
+                                .preference(key: MarkSizePrefKey.self, value: proxy.size.width)
+                                .onPreferenceChange(MarkSizePrefKey.self) { newValue in
+                                    cellSize = newValue
+                                }
+                        })
+                    cellProvider(1, 0)
+                    cellProvider(2, 0)
+                }
+                GridRow {
+                    cellProvider(0, 1)
+                    cellProvider(1, 1)
+                    cellProvider(2, 1)
+                }
+                GridRow {
+                    cellProvider(0, 2)
+                    cellProvider(1, 2)
+                    cellProvider(2, 2)
+                }
+            }
+            
+            let sepOffset = (cellSize + spacing) / 2
+            Separator(axis: .vertical)
+                .offset(x: -sepOffset)
+            Separator(axis: .vertical)
+                .offset(x: sepOffset)
+            Separator(axis: .horizontal)
+                .offset(y: -sepOffset)
+            Separator(axis: .horizontal)
+                .offset(y: sepOffset)
+        }
+        .padding(.all, spacing / 2)
+        .aspectRatio(1, contentMode: .fit)
+    }
+    
+    private func winOverlay(_ win: Win) -> some View {
+        let pointsWithIndices = win.points.map { ($0, $0.row * 3 + $0.column) }
+        let cellSize = cellSize + spacing
+        return ForEach(pointsWithIndices, id: \.1) { (point, _) in
+            Rectangle()
+                .foregroundColor(Color(UIColor.green))
+                .opacity(0.5)
+                .frame(width: cellSize, height: cellSize)
+                .offset(x: CGFloat(point.column - 1) * cellSize, y: CGFloat(point.row - 1) * cellSize)
+        }
+    }
+}
+
+private struct MarkSizePrefKey: PreferenceKey {
+    static var defaultValue: CGFloat = 0
+    
+    static func reduce(value: inout CGFloat, nextValue: () -> CGFloat) {
+        value = nextValue()
+    }
+}

Packages/TTTKit/Sources/TTTKit/UI/GameView.swift

@@ -0,0 +1,81 @@
+//
+//  GameView.swift
+//  TTTKit
+//
+//  Created by Shadowfacts on 12/21/22.
+//
+
+import SwiftUI
+
+@available(iOS 16.0, *)
+public struct GameView: View {
+    @ObservedObject private var controller: GameController
+    @State private var cellSize: CGFloat = 0
+    @State private var scaleAnchor: UnitPoint = .center
+    @State private var focusedSubBoard: (column: Int, row: Int)? = nil
+    
+    public init(controller: GameController) {
+        self.controller = controller
+    }
+    
+    public var body: some View {
+        let scale: CGFloat = focusedSubBoard == nil ? 1 : 2.5
+        return boardView
+            .scaleEffect(x: scale, y: scale, anchor: scaleAnchor)
+            .clipped()
+    }
+    
+    private var boardView: some View {
+        BoardView(board: controller.board, cellSize: $cellSize, spacing: 10) { column, row in
+            ZStack {
+                if case .playSpecific(_, column: column, row: row) = controller.state {
+                    Color.teal
+                        .padding(.all, -5)
+                        .opacity(0.4)
+                }
+                
+                let board = controller.board.getSubBoard(column: column, row: row)
+                SubBoardView(board: board, cellTapped: cellTapHandler(column, row))
+                    .environment(\.separatorColor, Color.gray.opacity(0.6))
+                    .contentShape(Rectangle())
+                    .onTapGesture {
+                        switch controller.state {
+                        case .playAnywhere(_), .playSpecific(_, column: column, row: row):
+                            scaleAnchor = UnitPoint(x: CGFloat(column) * 0.5, y: CGFloat(row) * 0.5)
+                            withAnimation(.easeInOut(duration: 0.3)) {
+                                focusedSubBoard = (column, row)
+                            }
+                        default:
+                            break
+                        }
+                    }
+                    .opacity(board.won ? 0.8 : 1)
+                
+                if let mark = board.win?.mark {
+                    MarkView(mark: mark)
+                }
+            }
+        }
+    }
+    
+    private func cellTapHandler(_ column: Int, _ row: Int) -> ((Int, Int) -> Void)? {
+        guard focusedSubBoard?.column == column && focusedSubBoard?.row == row else {
+            return nil
+        }
+        let subBoard = (column, row)
+        return { column, row in
+            controller.play(on: subBoard, column: column, row: row)
+            withAnimation(.easeInOut(duration: 0.3)) {
+                focusedSubBoard = nil
+            }
+        }
+    }
+}
+
+@available(iOS 16.0, *)
+struct GameView_Previews: PreviewProvider {
+    static var previews: some View {
+        GameView(controller: GameController())
+            .padding()
+    }
+}

Packages/TTTKit/Sources/TTTKit/UI/MarkView.swift

@@ -0,0 +1,39 @@
+//
+//  MarkView.swift
+//  TTTKit
+//
+//  Created by Shadowfacts on 12/21/22.
+//
+
+import SwiftUI
+
+@available(iOS 16.0, *)
+struct MarkView: View {
+    let mark: Mark?
+    
+    var body: some View {
+        maybeImage.aspectRatio(1, contentMode: .fit)
+    }
+    
+    @ViewBuilder
+    private var maybeImage: some View {
+        if let mark {
+            Image(systemName: mark == .x ? "xmark" : "circle")
+                .resizable()
+                .fontWeight(mark == .x ? .regular : .semibold)
+        } else {
+            Color.clear
+        }
+    }
+}
+
+@available(iOS 16.0, *)
+struct MarkView_Previews: PreviewProvider {
+    static var previews: some View {
+        HStack {
+            MarkView(mark: .x)
+            MarkView(mark: .o)
+            MarkView(mark: nil)
+        }
+    }
+}

Packages/TTTKit/Sources/TTTKit/UI/Separator.swift

@@ -0,0 +1,39 @@
+//
+//  SwiftUIView.swift
+//  
+//
+//  Created by Shadowfacts on 12/21/22.
+//
+
+import SwiftUI
+
+@available(iOS 16.0, *)
+struct Separator: View {
+    let axis: Axis
+    @Environment(\.separatorColor) private var separatorColor
+    
+    var body: some View {
+        rect
+            .foregroundColor(separatorColor)
+            .gridCellUnsizedAxes(axis == .vertical ? .vertical : .horizontal)
+    }
+    
+    private var rect: some View {
+        if axis == .vertical {
+            return Rectangle().frame(width: 1)
+        } else {
+            return Rectangle().frame(height: 1)
+        }
+    }
+}
+
+private struct SeparatorColorKey: EnvironmentKey {
+    static var defaultValue = Color.black
+}
+
+extension EnvironmentValues {
+    var separatorColor: Color {
+        get { self[SeparatorColorKey.self] }
+        set { self[SeparatorColorKey.self] = newValue }
+    }
+}

Packages/TTTKit/Sources/TTTKit/UI/SubBoardView.swift

@@ -0,0 +1,49 @@
+//
+//  SubBoardView.swift
+//  
+//
+//  Created by Shadowfacts on 12/21/22.
+//
+
+import SwiftUI
+
+@available(iOS 16.0, *)
+struct SubBoardView: View {
+    let board: TicTacToeBoard
+    let cellTapped: ((_ column: Int, _ row: Int) -> Void)?
+    @State private var cellSize: CGFloat = 0
+    
+    init(board: TicTacToeBoard, cellTapped: ((Int, Int) -> Void)? = nil) {
+        self.board = board
+        self.cellTapped = cellTapped
+    }
+    
+    var body: some View {
+        BoardView(board: board, cellSize: $cellSize, spacing: 10) { column, row in
+            applyTapHandler(column, row, MarkView(mark: board[column, row])
+                .contentShape(Rectangle()))
+        }
+    }
+    
+    @ViewBuilder
+    private func applyTapHandler(_ column: Int, _ row: Int, _ view: some View) -> some View {
+        if let cellTapped {
+            view.onTapGesture {
+                cellTapped(column, row)
+            }
+        } else {
+            view
+        }
+    }
+}
+
+@available(iOS 16.0, *)
+struct SubBoardView_Previews: PreviewProvider {
+    static var previews: some View {
+        SubBoardView(board: TicTacToeBoard(marks: [
+            [ .x,   .o,  .x],
+            [nil,   .x,  .o],
+            [ .x,  nil, nil],
+        ]))
+    }
+}

Packages/TTTKit/Tests/TTTKitTests/TTTKitTests.swift

@@ -0,0 +1,7 @@
+import XCTest
+@testable import TTTKit
+
+final class TTTKitTests: XCTestCase {
+    func testExample() throws {
+    }
+}

Tusker.xcodeproj/project.pbxproj

@@ -144,6 +144,8 @@
 		D6538945214D6D7500E3CEFC /* TableViewSwipeActionProvider.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6538944214D6D7500E3CEFC /* TableViewSwipeActionProvider.swift */; };
 		D653F411267D1E32004E32B1 /* DiffableTimelineLikeTableViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D653F410267D1E32004E32B1 /* DiffableTimelineLikeTableViewController.swift */; };
 		D6552367289870790048A653 /* ScreenCorners in Frameworks */ = {isa = PBXBuildFile; productRef = D6552366289870790048A653 /* ScreenCorners */; };
+		D659F35E2953A212002D944A /* TTTKit in Frameworks */ = {isa = PBXBuildFile; productRef = D659F35D2953A212002D944A /* TTTKit */; };
+		D659F36229541065002D944A /* TTTView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D659F36129541065002D944A /* TTTView.swift */; };
 		D65C6BF525478A9C00A6E89C /* BackgroundableViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D65C6BF425478A9C00A6E89C /* BackgroundableViewController.swift */; };
 		D65F613423AEAB6600F3CFD3 /* OnboardingTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = D65F613323AEAB6600F3CFD3 /* OnboardingTests.swift */; };
 		D6620ACE2511A0ED00312CA0 /* StatusStateResolver.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6620ACD2511A0ED00312CA0 /* StatusStateResolver.swift */; };
@@ -190,7 +192,9 @@
 		D68A76E329524D2A001DA1B3 /* ListMO.swift in Sources */ = {isa = PBXBuildFile; fileRef = D68A76E229524D2A001DA1B3 /* ListMO.swift */; };
 		D68A76E829527884001DA1B3 /* PinnedTimelinesView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D68A76E729527884001DA1B3 /* PinnedTimelinesView.swift */; };
 		D68A76EA295285D0001DA1B3 /* AddHashtagPinnedTimelineView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D68A76E9295285D0001DA1B3 /* AddHashtagPinnedTimelineView.swift */; };
+		D68A76EC295369A8001DA1B3 /* AboutView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D68A76EB295369A8001DA1B3 /* AboutView.swift */; };
 		D68A76EE295369C7001DA1B3 /* AcknowledgementsView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D68A76ED295369C7001DA1B3 /* AcknowledgementsView.swift */; };
+		D68A76F129539116001DA1B3 /* FlipView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D68A76F029539116001DA1B3 /* FlipView.swift */; };
 		D68ACE5D279B1ABA001CE8EB /* AssetPickerControlCollectionViewCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = D68ACE5C279B1ABA001CE8EB /* AssetPickerControlCollectionViewCell.swift */; };
 		D68C2AE325869BAB00548EFF /* AuxiliarySceneDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = D68C2AE225869BAB00548EFF /* AuxiliarySceneDelegate.swift */; };
 		D68E525B24A3D77E0054355A /* TuskerRootViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D68E525A24A3D77E0054355A /* TuskerRootViewController.swift */; };
@@ -520,6 +524,7 @@
 		D6531DEF246B867E000F9538 /* GifvAttachmentViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = GifvAttachmentViewController.swift; sourceTree = "<group>"; };
 		D6538944214D6D7500E3CEFC /* TableViewSwipeActionProvider.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TableViewSwipeActionProvider.swift; sourceTree = "<group>"; };
 		D653F410267D1E32004E32B1 /* DiffableTimelineLikeTableViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DiffableTimelineLikeTableViewController.swift; sourceTree = "<group>"; };
+		D659F36129541065002D944A /* TTTView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TTTView.swift; sourceTree = "<group>"; };
 		D65C6BF425478A9C00A6E89C /* BackgroundableViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BackgroundableViewController.swift; sourceTree = "<group>"; };
 		D65F612D23AE990C00F3CFD3 /* Embassy.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; path = Embassy.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		D65F613023AE99E000F3CFD3 /* Ambassador.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; path = Ambassador.framework; sourceTree = BUILT_PRODUCTS_DIR; };
@@ -569,7 +574,10 @@
 		D68A76E229524D2A001DA1B3 /* ListMO.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ListMO.swift; sourceTree = "<group>"; };
 		D68A76E729527884001DA1B3 /* PinnedTimelinesView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PinnedTimelinesView.swift; sourceTree = "<group>"; };
 		D68A76E9295285D0001DA1B3 /* AddHashtagPinnedTimelineView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AddHashtagPinnedTimelineView.swift; sourceTree = "<group>"; };
+		D68A76EB295369A8001DA1B3 /* AboutView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AboutView.swift; sourceTree = "<group>"; };
 		D68A76ED295369C7001DA1B3 /* AcknowledgementsView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AcknowledgementsView.swift; sourceTree = "<group>"; };
+		D68A76F029539116001DA1B3 /* FlipView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FlipView.swift; sourceTree = "<group>"; };
+		D68A76F22953915C001DA1B3 /* TTTKit */ = {isa = PBXFileReference; lastKnownFileType = wrapper; name = TTTKit; path = Packages/TTTKit; sourceTree = "<group>"; };
 		D68ACE5C279B1ABA001CE8EB /* AssetPickerControlCollectionViewCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AssetPickerControlCollectionViewCell.swift; sourceTree = "<group>"; };
 		D68C2AE225869BAB00548EFF /* AuxiliarySceneDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AuxiliarySceneDelegate.swift; sourceTree = "<group>"; };
 		D68E525A24A3D77E0054355A /* TuskerRootViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TuskerRootViewController.swift; sourceTree = "<group>"; };
@@ -732,6 +740,7 @@
 			buildActionMask = 2147483647;
 			files = (
 				D674A50927F9128D00BA03AC /* Pachyderm in Frameworks */,
+				D659F35E2953A212002D944A /* TTTKit in Frameworks */,
 				D60CFFDB24A290BA00D00083 /* SwiftSoup in Frameworks */,
 				D6552367289870790048A653 /* ScreenCorners in Frameworks */,
 				D6676CA527A8D0020052936B /* WebURLFoundationExtras in Frameworks */,
@@ -1075,6 +1084,7 @@
 				0427033922B31269000D31B6 /* AdvancedPrefsView.swift */,
 				D67895BF246870DE00D4CD9E /* LocalAccountAvatarView.swift */,
 				D68A76ED295369C7001DA1B3 /* AcknowledgementsView.swift */,
+				D68A76EF2953910A001DA1B3 /* About */,
 			);
 			path = Preferences;
 			sourceTree = "<group>";
@@ -1213,6 +1223,16 @@
 			path = "Account Detail";
 			sourceTree = "<group>";
 		};
+		D68A76EF2953910A001DA1B3 /* About */ = {
+			isa = PBXGroup;
+			children = (
+				D68A76EB295369A8001DA1B3 /* AboutView.swift */,
+				D68A76F029539116001DA1B3 /* FlipView.swift */,
+				D659F36129541065002D944A /* TTTView.swift */,
+			);
+			path = About;
+			sourceTree = "<group>";
+		};
 		D6A3BC822321F69400FD64D5 /* Account List */ = {
 			isa = PBXGroup;
 			children = (
@@ -1389,6 +1409,7 @@
 				D6D706A829498C82000827ED /* Tusker.xcconfig */,
 				D674A50727F910F300BA03AC /* Pachyderm */,
 				D6BEA243291A0C83002F4D01 /* Duckable */,
+				D68A76F22953915C001DA1B3 /* TTTKit */,
 				D6D4DDCE212518A000E1C4BB /* Tusker */,
 				D6D4DDE3212518A200E1C4BB /* TuskerTests */,
 				D6D4DDEE212518A200E1C4BB /* TuskerUITests */,
@@ -1585,6 +1606,7 @@
 				D6552366289870790048A653 /* ScreenCorners */,
 				D63CC701290EC0B8000E19DE /* Sentry */,
 				D6BEA244291A0EDE002F4D01 /* Duckable */,
+				D659F35D2953A212002D944A /* TTTKit */,
 			);
 			productName = Tusker;
 			productReference = D6D4DDCC212518A000E1C4BB /* Tusker.app */;
@@ -1911,6 +1933,7 @@
 				D6B053A623BD2D0C00A066FA /* AssetCollectionViewController.swift in Sources */,
 				D61A45E828DF477D002BE511 /* LoadingCollectionViewCell.swift in Sources */,
 				D67B506D250B291200FAECFB /* BlurHashDecode.swift in Sources */,
+				D68A76EC295369A8001DA1B3 /* AboutView.swift in Sources */,
 				D62275A024F1677200B82A16 /* ComposeHostingController.swift in Sources */,
 				04DACE8E212CC7CC009840C4 /* ImageCache.swift in Sources */,
 				D6BEA249291C6118002F4D01 /* DraftsView.swift in Sources */,
@@ -1967,6 +1990,7 @@
 				D61F75BD293D099600C0B37F /* Lazy.swift in Sources */,
 				D6BED174212667E900F02DA0 /* TimelineStatusTableViewCell.swift in Sources */,
 				D69693F42585941A00F4E116 /* UIWindowSceneDelegate+Close.swift in Sources */,
+				D659F36229541065002D944A /* TTTView.swift in Sources */,
 				D6C143DA253510F4007DC240 /* ComposeEmojiTextField.swift in Sources */,
 				D6DD2A3F273C1F4900386A6C /* ComposeAttachmentImage.swift in Sources */,
 				D6DD2A45273D6C5700386A6C /* GIFImageView.swift in Sources */,
@@ -2035,6 +2059,7 @@
 				D65234E12561AA68001AF9CF /* NotificationsTableViewController.swift in Sources */,
 				D6A6C11525B62E9700298D0F /* CacheExpiry.swift in Sources */,
 				D67C57AF21E28EAD00C3118B /* Array+Uniques.swift in Sources */,
+				D68A76F129539116001DA1B3 /* FlipView.swift in Sources */,
 				D6945C3223AC4D36005C403C /* HashtagTimelineViewController.swift in Sources */,
 				D647D92824257BEB0005044F /* AttachmentPreviewViewController.swift in Sources */,
 				D61F75B5293BD97400C0B37F /* DeleteFilterService.swift in Sources */,
@@ -2759,6 +2784,10 @@
 			package = D6552365289870790048A653 /* XCRemoteSwiftPackageReference "ScreenCorners" */;
 			productName = ScreenCorners;
 		};
+		D659F35D2953A212002D944A /* TTTKit */ = {
+			isa = XCSwiftPackageProductDependency;
+			productName = TTTKit;
+		};
 		D6676CA427A8D0020052936B /* WebURLFoundationExtras */ = {
 			isa = XCSwiftPackageProductDependency;
 			package = D6676CA127A8D0020052936B /* XCRemoteSwiftPackageReference "swift-url" */;

Tusker/Assets.xcassets/AboutIcon.imageset/Contents.json

@@ -0,0 +1,22 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "filename" : "256x256@2x.png",
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "filename" : "256x256@3x.png",
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Tusker/Screens/Preferences/About/AboutView.swift

@@ -0,0 +1,92 @@
+//
+//  AboutView.swift
+//  Tusker
+//
+//  Created by Shadowfacts on 12/21/22.
+//  Copyright © 2022 Shadowfacts. All rights reserved.
+//
+
+import SwiftUI
+
+struct AboutView: View {
+    private var version: String {
+        let marketing = Bundle.main.infoDictionary?["CFBundleShortVersionString"] as? String
+        let build = Bundle.main.infoDictionary?["CFBundleVersion"] as? String
+        return "\(marketing ?? "<unknown>") (\(build ?? "<unknown>"))"
+    }
+    
+    var body: some View {
+        List {
+            iconOrGame
+                .frame(maxWidth: .infinity, alignment: .center)
+                .listRowInsets(EdgeInsets(top: 9, leading: 0, bottom: 0, trailing: 0))
+                .listRowBackground(EmptyView())
+            
+            Section {
+                HStack {
+                    Text("Version")
+                    Spacer()
+                    Text(version)
+                        .foregroundColor(.secondary)
+                }
+                .contextMenu {
+                    Button {
+                        UIPasteboard.general.string = version
+                    } label: {
+                        Label("Copy", systemImage: "doc.on.doc")
+                    }
+                }
+            }
+            
+            Section {
+                Link("Website", destination: URL(string: "https://vaccor.space/tusker")!)
+                Link("Source Code", destination: URL(string: "https://git.shadowfacts.net/shadowfacts/Tusker")!)
+                Link("Issue Tracker", destination: URL(string: "https://git.shadowfacts.net/shadowfacts/Tusker/issues")!)
+            }
+        }
+    }
+    
+    @ViewBuilder
+    private var iconOrGame: some View {
+        if #available(iOS 16.0, *) {
+            FlipView {
+                appIcon
+            } back: {
+                TTTView()
+            }
+        } else {
+            appIcon
+        }
+    }
+    
+    private var appIcon: some View {
+        VStack {
+            AppIconView()
+                .shadow(radius: 6, y: 3)
+                .frame(width: 256, height: 256)
+            
+            Text("Tusker")
+                .font(.title2.bold())
+        }
+    }
+}
+
+struct AppIconView: UIViewRepresentable {
+    func makeUIView(context: Context) -> UIImageView {
+        let view = UIImageView(image: UIImage(named: "AboutIcon"))
+        view.contentMode = .scaleAspectFit
+        view.layer.cornerRadius = 256 / 6.4
+        view.layer.cornerCurve = .continuous
+        view.layer.masksToBounds = true
+        return view
+    }
+    
+    func updateUIView(_ uiView: UIImageView, context: Context) {
+    }
+}
+
+struct AboutView_Previews: PreviewProvider {
+    static var previews: some View {
+        AboutView()
+    }
+}

Tusker/Screens/Preferences/About/FlipView.swift

@@ -0,0 +1,116 @@
+//
+//  FlipView.swift
+//  Tusker
+//
+//  Created by Shadowfacts on 12/21/22.
+//  Copyright © 2022 Shadowfacts. All rights reserved.
+//
+
+import SwiftUI
+
+// Based on https://stackoverflow.com/a/60807269
+struct FlipView<Front: View, Back: View> : View {
+    private let front: Front
+    private let back: Back
+    
+    @State private var flipped = false
+    @State private var angle: Angle = .zero
+    @State private var width: CGFloat = 0
+    @State private var initialFlipped: Bool!
+    
+    init(@ViewBuilder front: () -> Front, @ViewBuilder back: () -> Back) {
+        self.front = front()
+        self.back = back()
+    }
+    
+    var body: some View {
+        ZStack {
+            front
+                .opacity(flipped ? 0.0 : 1.0)
+            back
+                .rotation3DEffect(.degrees(180), axis: (0, 1, 0))
+                .opacity(flipped ? 1.0 : 0.0)
+        }
+        .modifier(FlipEffect(flipped: $flipped, angle: angle.degrees, axis: (x: 0, y: 1)))
+        .background(GeometryReader { proxy in
+            Color.clear
+                .preference(key: WidthPrefKey.self, value: proxy.size.width)
+                .onPreferenceChange(WidthPrefKey.self) { newValue in
+                    width = newValue
+                }
+        })
+        .gesture(
+            DragGesture()
+                .onChanged({ value in
+                    if initialFlipped == nil {
+                        initialFlipped = flipped
+                    }
+                    let adj = (width / 2) - value.location.x
+                    let hyp = abs((width / 2) - value.startLocation.x)
+                    let clamped: Double = min(max(adj / hyp, -1), 1)
+                    let startedOnRight = value.startLocation.x > width / 2
+                    angle = .radians(acos(clamped) + (startedOnRight != initialFlipped ? .pi : 0))
+                })
+                .onEnded({ value in
+                    initialFlipped = nil
+                    let deg = angle.degrees.truncatingRemainder(dividingBy: 360)
+                    if deg == 0 {
+                        angle = .zero
+                    } else if deg == 180 {
+                        angle = .degrees(180)
+                    } else {
+                        withAnimation(.easeInOut(duration: 0.25)) {
+                            angle = deg > 90 && deg < 270 ? .degrees(180) : .zero
+                        }
+                    }
+                })
+        )
+        .onTapGesture {
+            withAnimation(.easeInOut(duration: 0.5)) {
+                angle = angle == .zero ? .degrees(180) : .zero
+            }
+        }
+    }
+}
+
+// Based on https://swiftui-lab.com/swiftui-animations-part2/
+struct FlipEffect: GeometryEffect {
+    var animatableData: Double {
+        get { angle }
+        set { angle = newValue }
+    }
+    
+    @Binding var flipped: Bool
+    var angle: Double
+    let axis: (x: CGFloat, y: CGFloat)
+    
+    func effectValue(size: CGSize) -> ProjectionTransform {
+        // We schedule the change to be done after the view has finished drawing,
+        // otherwise, we would receive a runtime error, indicating we are changing
+        // the state while the view is being drawn.
+        DispatchQueue.main.async {
+            self.flipped = self.angle >= 90 && self.angle < 270
+        }
+        
+        let a = CGFloat(Angle.degrees(angle).radians)
+        
+        var transform3d = CATransform3DIdentity
+        transform3d.m34 = -1/max(size.width, size.height)
+        
+        transform3d = CATransform3DRotate(transform3d, a, axis.x, axis.y, 0)
+        transform3d = CATransform3DTranslate(transform3d, -size.width/2.0, -size.height/2.0, 0)
+        
+        let affineTransform = ProjectionTransform(CGAffineTransform(translationX: size.width/2.0, y: size.height / 2.0))
+        
+        return ProjectionTransform(transform3d).concatenating(affineTransform)
+    }
+}
+
+private struct WidthPrefKey: PreferenceKey {
+    static var defaultValue: CGFloat = 0
+    
+    static func reduce(value: inout CGFloat, nextValue: () -> CGFloat) {
+        value = nextValue()
+    }
+}
+

Tusker/Screens/Preferences/About/TTTView.swift

@@ -0,0 +1,63 @@
+//
+//  TTTView.swift
+//  Tusker
+//
+//  Created by Shadowfacts on 12/21/22.
+//  Copyright © 2022 Shadowfacts. All rights reserved.
+//
+
+import SwiftUI
+import TTTKit
+import GameKit
+import OSLog
+
+@available(iOS 16.0, *)
+struct TTTView: View {
+    static let aiQueue = DispatchQueue(label: "TTT AI Strategist", qos: .userInitiated)
+    
+    @StateObject private var controller = GameController()
+    @State private var isAIThinking = false
+    @State private var strategist = {
+        let strategist = GKMinmaxStrategist()
+        strategist.maxLookAheadDepth = 5
+        return strategist
+    }()
+    
+    var body: some View {
+        VStack(alignment: .center) {
+            GameView(controller: controller)
+                .frame(width: 256, height: 256)
+            
+            if isAIThinking {
+                ProgressView()
+                    .progressViewStyle(.circular)
+            } else {
+                Text(controller.state.displayName)
+            }
+        }
+        .onReceive(controller.$state) { newState in
+            switch newState {
+            case .playAnywhere(.o), .playSpecific(.o, column: _, row: _):
+                isAIThinking = true
+                TTTView.aiQueue.async {
+                    let gameModel = GameModel(controller: controller)
+                    strategist.gameModel = gameModel
+                    let move = strategist.bestMoveForActivePlayer()!
+                    DispatchQueue.main.async {
+                        gameModel.apply(move)
+                        isAIThinking = false
+                    }
+                }
+            default:
+                break
+            }
+        }
+    }
+}
+
+@available(iOS 16.0, *)
+struct TTTView_Previews: PreviewProvider {
+    static var previews: some View {
+        TTTView()
+    }
+}

Tusker/Screens/Preferences/PreferencesView.swift

@@ -6,6 +6,7 @@
 //
 
 import SwiftUI
+import TTTKit
 
 struct PreferencesView: View {
     let mastodonController: MastodonController
@@ -98,6 +99,9 @@ struct PreferencesView: View {
                 }
                 
                 Section {
+                    NavigationLink("About") {
+                        AboutView()
+                    }
                     NavigationLink("Acknowledgements") {
                         AcknowledgementsView()
                     }