/* 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/>.
 *
 */

/*
 * This code is based on original Hugo Trilogy source code
 *
 * Copyright (c) 1989-1995 David P. Gray
 *
 */

#ifndef HUGO_FILE_H
#define HUGO_FILE_H

#include "common/file.h"

namespace Hugo {
/**
 * Enumerate overlay file types
 */
enum OvlType {kOvlBoundary, kOvlOverlay, kOvlBase};

struct UifHdr {                                      // UIF font/image look up
	uint16  _size;                                   // Size of uif item
	uint32  _offset;                                 // Offset of item in file
};


class FileManager {
public:
	FileManager(HugoEngine *vm);
	virtual ~FileManager();

	SoundPtr getSound(const int16 sound, uint16 *size);

	void     readBootFile();
	void     readImage(const int objNum, Object *objPtr);
	void     readUIFImages();
	void     readUIFItem(const int16 id, byte *buf);
	bool     restoreGame(const int16 slot);
	bool     saveGame(const int16 slot, const Common::String &descrip);

	// Name scenery and objects picture databases
	const char *getBootFilename()    const;
	const char *getObjectFilename()  const;
	const char *getSceneryFilename() const;
	const char *getSoundFilename()   const;
	const char *getStringFilename()  const;
	const char *getUifFilename()     const;

	virtual void openDatabaseFiles() = 0;
	virtual void closeDatabaseFiles() = 0;
	virtual void instructions() const = 0;

	virtual void readBackground(const int screenIndex) = 0;
	virtual void readOverlay(const int screenNum, ImagePtr image, OvlType overlayType) = 0;

	virtual const char *fetchString(const int index) = 0;

protected:
	HugoEngine *_vm;
	static const int kMaxUifs = 32;                 // Max possible uif items in hdr
	static const int kMaxSounds = 64;               // Max number of sounds
	static const int kRepeatMask = 0xC0;            // Top 2 bits mean a repeat code
	static const int kLengthMask = 0x3F;            // Lower 6 bits are length
	static const int kNumColors = 16;               // Num colors to save in palette

	/**
	 * Structure of scenery file lookup entry
	 */
	struct SceneBlock {
		uint32 _sceneOffset;
		uint32 _sceneLength;
		uint32 _boundaryOffset;
		uint32 _boundaryLength;
		uint32 _overlayOffset;
		uint32 _overlayLength;
		uint32 _baseOffset;
		uint32 _baseLength;
	};

	struct PCCHeader {                              // Structure of PCX file header
		byte   _mfctr, _vers, _enc, _bpx;
		uint16 _x1, _y1, _x2, _y2;                  // bounding box
		uint16 _xres, _yres;
		byte   _palette[3 * kNumColors];            // EGA color palette
		byte   _vmode, _planes;
		uint16 _bytesPerLine;                       // Bytes per line
		byte   _fill2[60];
	};                                              // Header of a PCC file

	bool _firstUIFFl;
	UifHdr _UIFHeader[kMaxUifs];                    // Lookup for uif fonts/images

	Common::File _stringArchive;                    // Handle for string file
	Common::File _sceneryArchive1;                  // Handle for scenery file
	Common::File _objectsArchive;                   // Handle for objects file

	Seq *readPCX(Common::SeekableReadStream &f, Seq *seqPtr, byte *imagePtr, const bool firstFl, const char *name);

	// If this is the first call, read the lookup table
	bool _hasReadHeader;
	SoundHdr _soundHdr[kMaxSounds];                    // Sound lookup table

private:
	UifHdr *getUIFHeader(const Uif id);
};

class FileManager_v1d : public FileManager {
public:
	FileManager_v1d(HugoEngine *vm);
	~FileManager_v1d() override;

	void closeDatabaseFiles() override;
	void instructions() const override;
	void openDatabaseFiles() override;
	void readBackground(const int screenIndex) override;
	void readOverlay(const int screenNum, ImagePtr image, OvlType overlayType) override;
	const char *fetchString(const int index) override;
};

class FileManager_v2d : public FileManager_v1d {
public:
	FileManager_v2d(HugoEngine *vm);
	~FileManager_v2d() override;

	void closeDatabaseFiles() override;
	void openDatabaseFiles() override;
	void readBackground(const int screenIndex) override;
	void readOverlay(const int screenNum, ImagePtr image, OvlType overlayType) override;
	const   char *fetchString(const int index) override;
private:
	char *_fetchStringBuf;
};

class FileManager_v3d : public FileManager_v2d {
public:
	FileManager_v3d(HugoEngine *vm);
	~FileManager_v3d() override;

	void closeDatabaseFiles() override;
	void openDatabaseFiles() override;
	void readBackground(const int screenIndex) override;
	void readOverlay(const int screenNum, ImagePtr image, OvlType overlayType) override;
private:
	Common::File _sceneryArchive2;                  // Handle for scenery file
};

class FileManager_v2w : public FileManager_v2d {
public:
	FileManager_v2w(HugoEngine *vm);
	~FileManager_v2w() override;

	void instructions() const override;
};

class FileManager_v1w : public FileManager_v2w {
public:
	FileManager_v1w(HugoEngine *vm);
	~FileManager_v1w() override;

	void readOverlay(const int screenNum, ImagePtr image, OvlType overlayType) override;
};

} // End of namespace Hugo
#endif //HUGO_FILE_H