pegspuzzle.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef NANCY_ACTION_PEGSPUZZLE_H
#define NANCY_ACTION_PEGSPUZZLE_H

#include "engines/nancy/commontypes.h"
#include "engines/nancy/action/puzzlerecord.h"
#include "engines/nancy/action/mousefollow.h"

namespace Nancy {
namespace Action {

// Peg-solitaire puzzle, new in Nancy13 (AR 173, "leaping" jump game). The board is
// a grid of holes (in Nancy13, a 7x7 grid with the four 2x2 corners blocked off,
// i.e. the classic 33-hole English peg-solitaire cross). A peg jumps over an
// adjacent peg into an empty hole two cells away, removing the jumped peg. The
// puzzle is solved when no move remains and the number of pegs left is at most the
// target count.
//
// Pegs are dragged and dropped: clicking a movable peg picks it up (the hand/drag
// cursor carries the piece) and dropping it on a hole it can reach performs the jump.
// Cell state matches the original: 0 = peg, 1 = empty hole, 2 = blocked (no hole).
class PegsPuzzle : public PuzzleRecord {
public:
    PegsPuzzle() : PuzzleRecord(7) {}
    virtual ~PegsPuzzle() {}

    void init() override;

    void readData(Common::SeekableReadStream &stream) override;
    void execute() override;
    void handleInput(NancyInput &input) override;

    bool isViewportRelative() const override { return true; }

protected:
    Common::String getRecordTypeName() const override { return "PegsPuzzle"; }

    enum CellState : byte { kPeg = 0, kEmpty = 1, kBlocked = 2 };

    int cellIndex(int col, int row) const { return col + row * 8; }
    bool validCell(int col, int row) const;
    // Whether a peg at (col,row) can jump in the direction (dCol,dRow), and if so the
    // landing cell.
    bool canJump(int col, int row, int dCol, int dRow, int &destCol, int &destRow) const;
    // Whether the carried peg can jump onto (col,row).
    bool isCarriedTarget(int col, int row) const;
    // The board cell whose destination rect contains the (screen-space) cursor, or false.
    bool cellAtCursor(const Common::Point &mousePos, int &outCol, int &outRow) const;
    bool cellHasAnyMove(int col, int row) const;
    bool anyMovesLeft() const;
    int pegCount() const;
    void doJump(int fromCol, int fromRow, int destCol, int destRow);

    void carryPeg(int col, int row, NancyInput &input);

    void redraw();

    // -- File data (96-byte header) --
    uint16 _hoverCursorType = 0;        // 0x21 - cursor while hovering a movable peg (open hand)
    uint16 _dragCursorType = 0;         // 0x23 - cursor while carrying a peg (pointing finger)
    byte _startEmptyFlag = 0;           // 0x25 - 0 => mark _startEmptyPos empty at init
    byte _startEmptyPos = 0;            // 0x26 - the initially-empty hole (usually the centre)
    byte _targetPegCount = 0;           // 0x27 - win when pegs remaining <= this
    SceneChangeDescription _loseScene;  // 0x2d - shown when no move remains and unsolved
    Common::Rect _pegSrc;               // 0x32 - normal peg sprite (viewport image)
    Common::Rect _selectedSrc;          // 0x42 - highlight sprite (selected peg / target holes)
    uint16 _originY = 0;                // 0x52 - board top-left (viewport space)
    uint16 _originX = 0;                // 0x54
    uint16 _numRows = 0;                // 0x56
    uint16 _numCols = 0;                // 0x58
    uint16 _pitchYBias = 0;             // 0x5a
    uint16 _pitchXBias = 0;             // 0x5c
    uint16 _numBlocked = 0;             // 0x5e - count of blocked-corner positions

    Common::Array<byte> _blockedPositions;

    Common::Array<RandomSoundBlock> _sounds;    // 5 blocks: select / jump / pulse / win / lose

    // -- Runtime state --
    Common::Array<byte> _board;         // 64 cells (8-wide stride)
    Common::Array<Common::Rect> _destRects;
    int _carriedCol = -1;               // the peg currently picked up (dragged), or -1
    int _carriedRow = -1;
    MouseFollowObject _carriedObject;   // the carried peg's sprite, riding the cursor
    bool _ended = false;
    bool _solved = false;
    bool _exitRequested = false;
    uint32 _endTime = 0;
    SoundDescription _endSound;         // the win/lose cue we wait on before changing scene

};

} // End of namespace Action
} // End of namespace Nancy

#endif // NANCY_ACTION_PEGSPUZZLE_H