conversation.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_CONVERSATION_H
#define NANCY_ACTION_CONVERSATION_H

#include "engines/nancy/action/actionrecord.h"
#include "engines/nancy/video.h"

namespace Nancy {
namespace Action {

// The base class for conversations, with no video data. Contains the following:
// - a base sound for the NPC's speech and its caption (mandatory)
// - a list of possible player responses, also with sounds and captions (optional)
// Captions are displayed in the Textbox, and player responses are also selectable there.
// Captions are hypertext; meaning, they contain extra data related to the text (see misc/hypertext.h)
// A conversation will auto-advance to a next scene when no responses are available; the next scene
// can either be described within the Conversation data, or can be whatever's pushed onto the scene "stack".
// Also supports branching scenes depending on a condition, though that is only used in older games.
// Player responses can also be conditional; the original engine had special-purpose "infocheck"
// functions, two per character ID, which were used to evaluate those conditions. We replace that with
// the data bundled inside nancy.dat (see devtools/create_nancy).
class ConversationSound : public RenderActionRecord {
public:
    ConversationSound();
    virtual ~ConversationSound();

    void init() override;
    void readData(Common::SeekableReadStream &stream) override;
    void execute() override;

    virtual bool isVideoDonePlaying() { return true; }

protected:
    struct ConversationFlag {
        byte type;
        FlagDescription flag;
        byte orFlag;

        void read(Common::SeekableReadStream &stream);
        bool isSatisfied() const;
        void set() const;
    };

    struct ConversationFlags {
        Common::Array<ConversationFlag> conditionFlags;

        void read(Common::SeekableReadStream &stream);
        bool isSatisfied() const;
    };

    struct ResponseStruct {
        enum AddRule { kAddIfNotFound, kRemoveAndAddToEnd, kRemove };

        ConversationFlags conditionFlags;
        Common::String text;
        Common::String soundName;
        byte addRule = kAddIfNotFound;
        SceneChangeDescription sceneChange;
        FlagDescription flagDesc;

        bool isOnScreen = false;
    };

    struct FlagsStruct {
        ConversationFlags conditions;
        ConversationFlag flagToSet;
    };

    struct SceneBranchStruct {
        ConversationFlags conditions;
        SceneChangeDescription sceneChange;
    };

    static const byte kDefaultNextSceneEnabled  = 1;
    static const byte kDefaultNextSceneDisabled = 2;

    static const byte kPopNextScene             = 1;
    static const byte kNoPopNextScene           = 2;

    Common::String getRecordTypeName() const override { return "ConversationSound"; }
    bool isViewportRelative() const override { return true; }

    // Functions for reading captions are virtual to allow easier support for the terse Conversation variants
    virtual void readCaptionText(Common::SeekableReadStream &stream);
    virtual void readResponseText(Common::SeekableReadStream &stream, ResponseStruct &response);

    // Used in subclasses
    void readTerseData(Common::SeekableReadStream &stream);
    void readTerseCaptionText(Common::SeekableReadStream &stream);
    void readTerseResponseText(Common::SeekableReadStream &stream, ResponseStruct &response);

    // Functions for handling the built-in dialogue responses found in the executable
    void addConditionalDialogue();
    void addGoodbye();

    Common::String _text;

    SoundDescription _sound;
    SoundDescription _responseGenericSound;

    byte _conditionalResponseCharacterID;
    byte _goodbyeResponseCharacterID;
    byte _defaultNextScene = kDefaultNextSceneEnabled;
    byte _popNextScene = kNoPopNextScene;
    SceneChangeDescription _sceneChange;

    Common::Array<ResponseStruct> _responses;
    Common::Array<FlagsStruct> _flagsStructs;
    Common::Array<SceneBranchStruct> _sceneBranchStructs;

    bool _hasDrawnTextbox;
    int16 _pickedResponse;

    const byte _noResponse;
};

// Conversation with an AVF video. Originally called PlayPrimaryVideoChan0
class ConversationVideo : public ConversationSound {
public:
    void init() override;
    void updateGraphics() override;
    void onPause(bool pause) override;

    void readData(Common::SeekableReadStream &stream) override;

    bool isVideoDonePlaying() override;

protected:
    Common::String getRecordTypeName() const override;

    Common::String _videoName;
    Common::Path _paletteName;
    uint _videoFormat = kLargeVideoFormat;
    uint16 _firstFrame = 0;
    int16 _lastFrame = 0;
    AVFDecoder _decoder;
};

class ConversationCelLoader;

// Conversation with separate cels for the body and head of the character.
// Cels are separate images bundled inside a .cal file
class ConversationCel : public ConversationSound {
    friend class ConversationCelLoader;
public:
    ConversationCel() {}
    virtual ~ConversationCel();

    void init() override;
    void registerGraphics() override;
    void updateGraphics() override;

    void readData(Common::SeekableReadStream &stream) override;

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

    struct Cel {
        Graphics::ManagedSurface surf;
        Common::Rect src;
        Common::Rect dest;
    };

    class RenderedCel : public RenderObject {
        friend class ConversationCel;
    public:
        RenderedCel() : RenderObject(9) {}
        bool isViewportRelative() const override { return true; }
    };

    static const byte kCelOverrideTreeRectsOff  = 1;
    static const byte kCelOverrideTreeRectsOn   = 2;

    bool isVideoDonePlaying() override;
    Cel &loadCel(const Common::Path &name, const Common::String &treeName);

    void readXSheet(Common::SeekableReadStream &stream, const Common::String &xsheetName);

    Common::Array<Common::Array<Common::Path>> _celNames;
    Common::Array<Common::String> _treeNames;

    uint16 _frameTime = 0;
    uint _videoFormat = kLargeVideoFormat;
    uint16 _firstFrame = 0;
    uint16 _lastFrame = 0;

    Common::Array<byte> _drawingOrder;
    Common::Array<byte> _overrideTreeRects;

    Common::Array<Common::Rect> _overrideRectSrcs;
    Common::Array<Common::Rect> _overrideRectDests;

    uint _curFrame = 0;
    uint32 _nextFrameTime = 0;

    Common::Array<RenderedCel> _celRObjects;

    Common::HashMap<Common::Path, Cel, Common::Path::IgnoreCase_Hash, Common::Path::IgnoreCase_EqualTo> _celCache;
    Common::SharedPtr<ConversationCelLoader> _loaderPtr;
};

// A ConversationSound without embedded text; uses the CONVO chunk instead
class ConversationSoundT : public ConversationSound {
protected:
    Common::String getRecordTypeName() const override { return "ConversationSoundT"; }

    void readCaptionText(Common::SeekableReadStream &stream) override { readTerseCaptionText(stream); }
    void readResponseText(Common::SeekableReadStream &stream, ResponseStruct &response) override { readTerseResponseText(stream, response); }
};

// A ConversationCel without embedded text; uses the CONVO chunk instead
class ConversationCelT : public ConversationCel {
protected:
    Common::String getRecordTypeName() const override { return "ConversationCelT"; }

    void readCaptionText(Common::SeekableReadStream &stream) override { readTerseCaptionText(stream); }
    void readResponseText(Common::SeekableReadStream &stream, ResponseStruct &response) override { readTerseResponseText(stream, response); }
};

// A ConversationSound with a much smaller data footprint
class ConversationSoundTerse : public ConversationSound {
public:
    void readData(Common::SeekableReadStream &stream) override;

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

// A ConversationCel with a much smaller data footprint
class ConversationCelTerse : public ConversationCel {
public:
    void readData(Common::SeekableReadStream &stream) override;

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

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

#endif // NANCY_ACTION_CONVERSATION_H