/* 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 2
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL$
 * $Id$
 *
 */

#ifndef SCI_GFX_GFX_RESMGR_H
#define SCI_GFX_GFX_RESMGR_H

// FIXME/TODO: The name "(Graphics) resource manager", and the associated
// filenames, are misleading. This should be renamed to "Graphics manager"
// or something like that.

#include "sci/gfx/gfx_resource.h"
#include "sci/resource.h"

#include "common/hashmap.h"
#include "common/rect.h"

namespace Sci {

struct gfx_bitmap_font_t;
class ResourceManager;

enum gfx_resource_type_t {
	GFX_RESOURCE_TYPE_VIEW = 0,
	GFX_RESOURCE_TYPE_PIC,
	GFX_RESOURCE_TYPE_FONT,
	GFX_RESOURCE_TYPE_CURSOR,
	GFX_RESOURCE_TYPE_PALETTE,
	/* FIXME: Add PAL resource */

	GFX_RESOURCE_TYPES_NR /**< Number of resource types that are to be supported */
};

#define GFX_RESOURCE_TYPE_0 GFX_RESOURCE_TYPE_VIEW

#define GFXR_RES_ID(type, index) ((type) << 16 | (index))
#define GFXR_RES_TYPE(id) (id >> 16)
#define GFXR_RES_NR(id) (id & 0xffff)

/** Graphics resource */
struct gfx_resource_t {
	int ID; 				/**< Resource ID */
	int lock_sequence_nr;	/**< See description of lock_counter in GfxResManager */
	int mode;				/**< A mode type hash */

	/** Scaled pic */
	union {
		gfx_pixmap_t *pointer;
		gfxr_view_t *view;
		gfx_bitmap_font_t *font;
		gfxr_pic_t *pic;
	} scaled_data;

	/** Original pic */
	union {
		gfx_pixmap_t *pointer;
		gfxr_view_t *view;
		gfx_bitmap_font_t *font;
		gfxr_pic_t *pic;
	} unscaled_data;

};


struct gfx_options_t;

typedef Common::HashMap<int, gfx_resource_t *> IntResMap;

/** Graphics resource manager */
class GfxResManager {
public:
	GfxResManager(int version, gfx_options_t *options,
			GfxDriver *driver, ResourceManager *resManager);

	~GfxResManager();

	/**
	 * Calculates a unique hash value for the specified options/type
	 * setup.
	 *
	 * Covering more entries than relevant may slow down the system when
	 * options are changed, while covering less may result in invalid
	 * cached data being used.
	 * Only positive values may be returned, as negative values are used
	 * internally by the generic resource manager code.
	 * Also, only the lower 20 bits are available to the interpreter.
	 * (Yes, this isn't really a "hash" in the traditional sense...)
	 *
	 * @param[in] type	The type the hash is to be generated for
	 * @return			A hash over the values of the options entries,
	 * 					covering entries iff they are relevant for the
	 * 					specified type.
	 */
	int getOptionsHash(gfx_resource_type_t type);


	/**
	 * 'Tags' all resources for deletion.
	 *
	 * Tagged resources are untagged if they are referenced.
	 */
	void tagResources() { _tagLockCounter++; }


	/**
	 * Retrieves an SCI0/SCI01 mouse cursor.
	 *
	 * @param[in] num	The cursor number
	 * @return			The approprate cursor as a pixmap, or NULL on error
	 */
	gfx_pixmap_t *getCursor(int num);


	/**
	 * Retrieves the static palette from the interpreter-specific code.
	 *
	 * @param[in] colors_nr	Number of colors to use
	 * @param[in] num		The palette to read
	 * @return				Static palette if a static palette must be
	 * 						used, NULL otherwise
	 */
	Palette *getPalette(int *colors_nr, int num = 999);


	/**
	 * Retrieves a font.
	 *
	 * @param[in] num		The font number
	 * @param[in] scaled	Whether the font should be font-scaled
	 * @return				The appropriate font, or NULL on error
	 */
	gfx_bitmap_font_t *getFont(int num, bool scaled = false);


	/**
	 * Retrieves a translated view cel.
	 *
	 * @param[in] nr		The view number
	 * @param[in] loop		Pointer to a variable containing the loop number
	 * @param[in] cel		Pointer to a variable containing the cel number
	 * @param[in] palette	The palette to use
	 * @return				The relevant view, or NULL if nr was invalid
	 * 						loop and cel are given as pointers in order to
	 * 						allow the underlying variables to be modified
	 * 						if they are invalid (this is relevant for SCI
	 * 						version 0, where invalid loop and cel numbers
	 * 						have to be interpreted as 'maximum' or 'minimum'
	 * 						by the interpreter)
	 */
	gfxr_view_t *getView(int nr, int *loop, int *cel, int palette);


	/**
	 * Retrieves a displayable (translated) pic resource.
	 *
	 * @param[in] num				Number of the pic resource
	 * @param[in] maps				The maps to translate (ORred GFX_MASK_*)
	 * @param[in] flags				Interpreter-dependant pic flags
	 * @param[in] default_palette	The default palette to use for drawing
	 * 								(if applicable)
	 * @param[in] scaled			Whether to return the scaled maps, or
	 * 								the unscaled ones (which may be
	 * 								identical) for some special operations.
	 * @return						The appropriate pic resource with all
	 * 								maps as index (but not neccessarily
	 * 								translated) data.
	 */
	gfxr_pic_t *getPic(int num, int maps, int flags, int default_palette,
			bool scaled = false);


	/**
	 * Retrieves a displayable (translated) pic resource written ontop of
	 * an existing pic.
	 *
	 * This function invalidates the cached pic pointed to by old_nr in the
	 * cache. While subsequent addToPic() writes will still modify the
	 * 'invalidated' pic, gfxr_get_pic() operations will cause it to be
	 * removed from the cache and to be replaced by a clean version.
	 *
	 * @param[in] old_nr				Number of the pic resource to write on
	 * @param[in] new_nr				Number of the pic resource that is to
	 * 									be added
	 * @param[in] flags					Interpreter-dependant pic flags
	 * @param[in] old_default_palette	The default palette of the pic before
	 * 									translation
	 * @param[in] default_palette		The default palette to use for drawing
	 * 									(if applicable)
	 * @return							The appropriate pic resource with all
	 * 									maps as index (but not neccessarily
	 * 									translated) data.
	 */
	gfxr_pic_t *addToPic(int old_nr, int new_nr, int flags,
			int old_default_palette, int default_palette);

	/**
	 * Calculate a picture
	 *
	 * @param[in] scaled_pic		The pic structure that is to be
	 * 								written to
	 * @param[in] unscaled_pic		The pic structure the unscaled pic is
	 * 								to be written to, or NULL if it isn't
	 * 								needed.
	 * @param[in] flags				Pic drawing flags (interpreter
	 * 								dependant)
	 * @param[in] default_palette	The default palette to use for pic
	 * 								drawing (interpreter dependant)
	 * @param[in] nr				pic resource number
	 * @return						GFX_ERROR if the resource could not be
	 * 								found, GFX_OK otherwise
	 */
	int calculatePic(gfxr_pic_t *scaled_pic, gfxr_pic_t *unscaled_pic,
			int flags, int default_palette, int nr);

	/**
	 * Determines whether support for pointers with more than two colors
	 * is required.
	 *
	 * @return	false if no support for multi-colored pointers is required,
	 * 			true otherwise
	 */
	bool multicoloredPointers() { return _version > SCI_VERSION_1; }


	/**
	 * Frees all resources currently allocated.
	 *
	 * This function is intended to be used primarily for debugging.
	 */
	void freeAllResources();


	/**
	 * Frees all tagged resources.
	 *
	 * Resources are tagged by calling gfx_tag_resources(), and untagged by
	 * calling the approprate dereferenciation function.
	 * Note that this function currently only affects view resources, as
	 * pic resources are treated differently, while font and cursor
	 * resources are relatively rare.
	 */
	void freeTaggedResources();


	/**
	 * Frees a previously allocated resource manager, and all allocated
	 * resources.
	 */
	void freeResManager();

	/**
	 * Retrieves a color from the static palette
	 */
	const PaletteEntry &getColor(int color)
	{
		return _staticPalette->getColor(color);
	}

	/**
	 * Set static palette and merge it into the global palette
	 */
	void setStaticPalette(Palette *newPalette);

	/**
	 * Sets the picture port bounds
	 */
	void changePortBounds(int x1, int y1, int x2, int y2) {
		_portBounds = Common::Rect(x1, y1, x2, y2);
	}

#if 0
	void setPaletteIntensity(int16 from, int16 to, int16 intensity) {
		Palette *pal = _staticPalette->getref();

		for (uint16 i = 0; i < _driver->getMode()->palette->size(); i++) {
			byte r = pal->getColor(i).r * intensity / 100;
			byte g = pal->getColor(i).g * intensity / 100;
			byte b = pal->getColor(i).b * intensity / 100;
			pal->makeSystemColor(i, PaletteEntry(r, g, b));
		}
		pal->mergeInto(_driver->getMode()->palette);
		_driver->install_palette(_driver, pal);
		pal->unmerge();
		pal->free();
	}
#endif

	/**
	 * Gets the number of colors in the static palette.
	 *
	 * @return	Number of pallete entries
	 */
	int getColorCount() {
		return _staticPalette ? _staticPalette->size() : 0;
	}

private:
	int _version;
	gfx_options_t *_options;
	GfxDriver *_driver;
	Palette *_staticPalette;
	int _lockCounter;	/**< Global lock counter; increased for each new
						 * resource allocated. The newly allocated resource will
						 * then be assigned the new value of the lock_counter,
						 * as will any resources referenced afterwards. */
	int _tagLockCounter; /**< lock counter value at tag time */
	Common::Rect _portBounds;

	IntResMap _resourceMaps[GFX_RESOURCE_TYPES_NR];
	ResourceManager *_resManager;
};

} // End of namespace Sci

#endif // SCI_GFX_GFX_RSMGR_H