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//  command.h
//  Created by Bob Nystrom on 10/7/13.
//  Copyright (c) 2013 Bob Nystrom. All rights reserved.
#ifndef cpp_command_h
#define cpp_command_h
namespace CommandPattern
  enum Button
    BUTTON_UP,
    BUTTON_DOWN,
    BUTTON_LEFT,
    BUTTON_RIGHT,
    BUTTON_X,
    BUTTON_Y,
    BUTTON_A,
    BUTTON_B
  bool isPressed(Button button) { return false; }
  void jump() {}
  void fireGun() {}
  void swapWeapon() {}
  void lurchIneffectively() {}
  namespace BeforeCommand
    class InputHandler
    public:
      void handleInput();
    //^handle-input
    void InputHandler::handleInput()
      if (isPressed(BUTTON_X)) jump();
      else if (isPressed(BUTTON_Y)) fireGun();
      else if (isPressed(BUTTON_A)) swapWeapon();
      else if (isPressed(BUTTON_B)) lurchIneffectively();
    //^handle-input
  namespace InputHandlingCommand
    //^command
    class Command
    public:
      virtual ~Command() {}
      virtual void execute() = 0;
    //^command
    //^command-classes
    class JumpCommand : public Command
    public:
      virtual void execute() { jump(); }
    class FireCommand : public Command
    public:
      virtual void execute() { fireGun(); }
    // 你知道思路了吧
    //^command-classes
    //^input-handler-class
    class InputHandler
    public:
      void handleInput();
      // 绑定命令的方法……
    private:
      Command* buttonX_;
      Command* buttonY_;
      Command* buttonA_;
      Command* buttonB_;
    //^input-handler-class
    //^handle-input-commands
    void InputHandler::handleInput()
      if (isPressed(BUTTON_X)) buttonX_->execute();
      else if (isPressed(BUTTON_Y)) buttonY_->execute();
      else if (isPressed(BUTTON_A)) buttonA_->execute();
      else if (isPressed(BUTTON_B)) buttonB_->execute();
    //^handle-input-commands
  namespace CommandedActors
    class GameActor
    public:
      void jump() {}
    //^actor-command
    class Command
    public:
      virtual ~Command() {}
      virtual void execute(GameActor& actor) = 0;
    //^actor-command
    //^jump-actor
    class JumpCommand : public Command
    public:
      virtual void execute(GameActor& actor)
        actor.jump();
    //^jump-actor
    class InputHandler
    public:
      Command* handleInput();
    private:
      Command* buttonX_;
      Command* buttonY_;
      Command* buttonA_;
      Command* buttonB_;
    //^handle-input-return
    Command* InputHandler::handleInput()
      if (isPressed(BUTTON_X)) return buttonX_;
      if (isPressed(BUTTON_Y)) return buttonY_;
      if (isPressed(BUTTON_A)) return buttonA_;
      if (isPressed(BUTTON_B)) return buttonB_;
      // 没有按下任何按键，就什么也不做
      return NULL;
    //^handle-input-return
    void executeCommand()
      InputHandler inputHandler;
      GameActor actor;
      //^call-actor-command
      Command* command = inputHandler.handleInput();
      if (command)
        command->execute(actor);
      //^call-actor-command
      use(actor);
  namespace Undo
    class Unit {
    public:
      int x() { return 0; }
      int y() { return 0; }
      void moveTo(int x, int y) {}
    namespace UndoBefore
      class Command
      public:
        virtual ~Command() {}
        virtual void execute() = 0;
      //^move-unit
      class MoveUnitCommand : public Command
      public:
        MoveUnitCommand(Unit* unit, int x, int y)
        : unit_(unit),
          x_(x),
          y_(y)
        virtual void execute()
          unit_->moveTo(x_, y_);
      private:
        Unit* unit_;
        int x_, y_;
      //^move-unit
      Unit* getSelectedUnit() { return NULL; }
      //^get-move
      Command* handleInput()
        Unit* unit = getSelectedUnit();
        if (isPressed(BUTTON_UP)) {
          // 向上移动单位
          int destY = unit->y() - 1;
          return new MoveUnitCommand(unit, unit->x(), destY);
        if (isPressed(BUTTON_DOWN)) {
          // 向下移动单位
          int destY = unit->y() + 1;
          return new MoveUnitCommand(unit, unit->x(), destY);
        // 其他的移动……
        return NULL;
      //^get-move
    namespace UndoAfter
      //^undo-command
      class Command
      public:
        virtual ~Command() {}
        virtual void execute() = 0;
        virtual void undo() = 0;
      //^undo-command
      //^undo-move-unit
      class MoveUnitCommand : public Command
      public:
        MoveUnitCommand(Unit* unit, int x, int y)
        : unit_(unit),
          xBefore_(0),
          yBefore_(0),
          x_(x),
          y_(y)
        virtual void execute()
          // 保存移动之前的位置
          // 这样之后可以复原。
          xBefore_ = unit_->x();
          yBefore_ = unit_->y();
          unit_->moveTo(x_, y_);
        virtual void undo()
          unit_->moveTo(xBefore_, yBefore_);
      private:
        Unit* unit_;
        int xBefore_, yBefore_;
        int x_, y_;
      //^undo-move-unit
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