SVN / public / code / projekt / template / TerminalManager.h

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// Copyright 2026, University of Freiburg,
// Chair of Algorithms and Data Structures.
// Author: Johannes Kalmbach <kalmbach@cs.uni-freiburg.de>.
// Author: Christoph Ullinger <ullingec@cs.uni-freiburg.de>.

#pragma once

// User input (a key press or a mouse click), shared by all `TerminalManager`
// subclasses that read input, so callers (and the game logic) don't
// have to care which concrete backend produced it.
class UserInput {
public:
  // Functions that check for particular keys.
  bool isEscape();
  bool isKeyLeft();
  bool isKeyRight();
  bool isKeyUp();
  bool isKeyDown();
  bool isMouseclick();
  // The code of the key that was pressed.
  int keycode_;
  // The position of a mouse click, or -1/-1 if the event was a key press.
  int mouseRow_ = -1;
  int mouseCol_ = -1;
};

// An abstract base class that defines an interface for drawing pixels
// on a screen.
class TerminalManager {
public:
  // Colors usable with on any TerminalManager implementation, matching the
  // standard ANSI/ncurses 8-color palette (0..7) plus a "bright black"/grey
  // at 8.
  static constexpr int Black = 0;
  static constexpr int Red = 1;
  static constexpr int Green = 2;
  static constexpr int Yellow = 3;
  static constexpr int Blue = 4;
  static constexpr int Magenta = 5;
  static constexpr int Cyan = 6;
  static constexpr int White = 7;
  // "Bright black". Needs a terminal with at least 16 colors.
  static constexpr int Grey = 8;
  // "Orange". Not part of the base ANSI palette; ncurses-based backends fall
  // back to their palette's "bright red" (color 9).
  static constexpr int Orange = 9;
  // "Bright yellow". Needs a terminal with at least 16 colors.
  static constexpr int BrightYellow = 11;

  // Virtual destructor.
  virtual ~TerminalManager() = default;

  // Draw a pixel at the given position in the given color. The meaning of a
  // color value is up to the concrete implementation.
  virtual void drawPixel(int row, int col, int color) = 0;

  // Draw a string at the given position in the given color.
  virtual void drawString(int row, int col, const char *str, int color) = 0;

  // Get input from the user (a key press or a mouse click). The default
  // implementation reports "no input this frame", for backends (like
  // MockTerminalManager).
  virtual UserInput getUserInput() { return UserInput{}; }

  // Refresh the screen.
  virtual void refresh() = 0;

  // Get the dimensions of the screen.
  virtual int numRows() const = 0;
  virtual int numCols() const = 0;
};