/* 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.
 *
 * $URL$
 * $Id$
 *
 */

// Resource manager core part

// 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/gfx/gfx_tools.h"
#include "sci/gfx/gfx_driver.h"
#include "sci/gfx/gfx_resmgr.h"
#include "sci/gfx/gfx_state_internal.h"
#include "sci/gfx/font.h"

#include "common/system.h"

namespace Sci {

#undef TIME_PICDRAWING

// Invalid hash mode: Used to invalidate modified pics
#define MODE_INVALID -1

struct param_struct {
	int args[4];
	gfx_driver_t *driver;
};

gfx_resstate_t *gfxr_new_resource_manager(int version, gfx_options_t *options, gfx_driver_t *driver, ResourceManager *resManager) {
	gfx_resstate_t *state = (gfx_resstate_t *)sci_malloc(sizeof(gfx_resstate_t));
	int ii;

	state->version = version;
	state->options = options;
	state->driver = driver;
	state->resManager = resManager;
	state->static_palette = 0;

	state->tag_lock_counter = state->lock_counter = 0;
	for (ii = 0; ii < GFX_RESOURCE_TYPES_NR; ii++) {
		gfx_resource_type_t i = (gfx_resource_type_t) ii;
		sbtree_t *tree;
		int entries_nr;
		int *resources = gfxr_interpreter_get_resources(state->resManager, i, version, &entries_nr);

		if (!resources)
			state->resource_trees[i] = NULL;
		else {
			tree = sbtree_new(entries_nr, resources);
			if (!tree) {
				GFXWARN("Failed to allocate tree for %d entries of resource type %d!\n", entries_nr, i);
			}
			state->resource_trees[i] = tree;
			free(resources);
		}
	}

	return state;
}

#define FREEALL(freecmd, type) \
	if (resource->scaled_data.type) \
		freecmd(driver, resource->scaled_data.type); \
	resource->scaled_data.type = NULL; \
	if (resource->unscaled_data.type) \
		freecmd(driver, resource->unscaled_data.type); \
	resource->unscaled_data.type = NULL;

#define FREEALL_SIMPLE(freecmd, type) \
	if (resource->scaled_data.type) \
		freecmd(resource->scaled_data.type); \
	resource->scaled_data.type = NULL; \
	if (resource->unscaled_data.type) \
		freecmd(resource->unscaled_data.type); \
	resource->unscaled_data.type = NULL;

void gfxr_free_resource(gfx_driver_t *driver, gfx_resource_t *resource, int type) {
	if (!resource)
		return;

	switch (type) {

	case GFX_RESOURCE_TYPE_VIEW:
		FREEALL(gfxr_free_view, view);
		break;

	case GFX_RESOURCE_TYPE_PIC:
		FREEALL(gfxr_free_pic, pic);
		break;

	case GFX_RESOURCE_TYPE_FONT:
		FREEALL_SIMPLE(gfxr_free_font, font);
		break;

	case GFX_RESOURCE_TYPE_CURSOR:
		FREEALL(gfx_free_pixmap, pointer);
		break;

	default:
		GFXWARN("Attempt to free invalid resource type %d\n", type);
	}

	free(resource);
}

#undef FREECMD

void *gfxr_sbtree_free_func(sbtree_t *tree, const int key, const void *value, void *args) {
	struct param_struct *params = (struct param_struct *) args;
	int type = params->args[0];
	gfx_driver_t *driver = params->driver;

	if (value)
		gfxr_free_resource(driver, (gfx_resource_t *) value, type);

	return NULL;
}

#define SBTREE_FREE_TAGGED_ARG_TYPE 0
#define SBTREE_FREE_TAGGED_ARG_TAGVALUE 1
#define SBTREE_FREE_TAGGED_ARG_ACTION 2

#define ARG_ACTION_RESET 0
#define ARG_ACTION_DECREMENT 1

void *gfxr_sbtree_free_tagged_func(sbtree_t *tree, const int key, const void *value, void *args) {
	struct param_struct *params = (struct param_struct *) args;
	int type = params->args[SBTREE_FREE_TAGGED_ARG_TYPE];
	int tag_value = params->args[SBTREE_FREE_TAGGED_ARG_TAGVALUE];
	int action = params->args[SBTREE_FREE_TAGGED_ARG_ACTION];
	gfx_driver_t *driver = params->driver;
	gfx_resource_t *resource = (gfx_resource_t *) value;
	if (resource) {
		if (resource->lock_sequence_nr < tag_value) {
			gfxr_free_resource(driver, (gfx_resource_t *) value, type);
			return NULL;
		} else {
			if (action == ARG_ACTION_RESET)
				resource->lock_sequence_nr = 0;
			else
				(resource->lock_sequence_nr)--;
			// FIXME: const_cast does not sound like a good idea,
			// maybe we should just make the value parameter
			// non const instead?
			return const_cast<void *>(value);
		}
	} else
		return NULL;
}

void gfxr_free_all_resources(gfx_driver_t *driver, gfx_resstate_t *state) {
	struct param_struct params;
	int i;
	sbtree_t *tree = NULL;

	for (i = 0; i < GFX_RESOURCE_TYPES_NR; i++)
		if ((tree = state->resource_trees[i])) {
			params.args[0] = i;
			params.driver = driver;
			sbtree_foreach(tree, (void *) &params, gfxr_sbtree_free_func);
		}
}

void gfxr_free_resource_manager(gfx_driver_t *driver, gfx_resstate_t *state) {
	struct param_struct params;
	int i;
	sbtree_t *tree = NULL;

	for (i = 0; i < GFX_RESOURCE_TYPES_NR; i++)
		if ((tree = state->resource_trees[i])) {
			params.args[0] = i;
			params.driver = driver;
			sbtree_foreach(tree, (void *)&params, gfxr_sbtree_free_func);
			sbtree_free(tree);
		}

	free(state);
}

void gfxr_tag_resources(gfx_resstate_t *state) {
	(state->tag_lock_counter)++;
}

void gfxr_free_tagged_resources(gfx_driver_t *driver, gfx_resstate_t *state) {
	// Current heuristics: free tagged views and old pics
	struct param_struct params;

	if (state->resource_trees[GFX_RESOURCE_TYPE_VIEW]) {
		params.args[SBTREE_FREE_TAGGED_ARG_TYPE] = GFX_RESOURCE_TYPE_VIEW;
		params.args[SBTREE_FREE_TAGGED_ARG_TAGVALUE] = state->tag_lock_counter;
		params.args[SBTREE_FREE_TAGGED_ARG_ACTION] = ARG_ACTION_RESET;
		params.driver = driver;
		sbtree_foreach(state->resource_trees[GFX_RESOURCE_TYPE_VIEW], (void *) &params, gfxr_sbtree_free_tagged_func);
	}

	if (state->resource_trees[GFX_RESOURCE_TYPE_PIC]) {
		params.args[SBTREE_FREE_TAGGED_ARG_TYPE] = GFX_RESOURCE_TYPE_PIC;
		params.args[SBTREE_FREE_TAGGED_ARG_TAGVALUE] = 0;
		params.args[SBTREE_FREE_TAGGED_ARG_ACTION] = ARG_ACTION_DECREMENT;
		params.driver = driver;
		sbtree_foreach(state->resource_trees[GFX_RESOURCE_TYPE_PIC], (void *) &params, gfxr_sbtree_free_tagged_func);
	}

	state->tag_lock_counter = 0;
}

#define XLATE_AS_APPROPRIATE(key, entry) \
	if (maps & key) { \
		if (res->unscaled_data.pic&& (force || !res->unscaled_data.pic->entry->data)) { \
				if (key == GFX_MASK_VISUAL) \
					gfx_get_res_config(options, res->unscaled_data.pic->entry); \
			        gfx_xlate_pixmap(res->unscaled_data.pic->entry, mode, filter); \
		} if (scaled && res->scaled_data.pic && (force || !res->scaled_data.pic->entry->data)) { \
				if (key == GFX_MASK_VISUAL) \
					gfx_get_res_config(options, res->scaled_data.pic->entry); \
				gfx_xlate_pixmap(res->scaled_data.pic->entry, mode, filter); \
		} \
	}

static gfxr_pic_t *gfxr_pic_xlate_common(gfx_resource_t *res, int maps, int scaled, int force, gfx_mode_t *mode,
										 gfx_xlate_filter_t filter, int endianize, gfx_options_t *options) {
	XLATE_AS_APPROPRIATE(GFX_MASK_VISUAL, visual_map);
	XLATE_AS_APPROPRIATE(GFX_MASK_PRIORITY, priority_map);
	XLATE_AS_APPROPRIATE(GFX_MASK_CONTROL, control_map);

	if (endianize && (maps & GFX_MASK_VISUAL) && res->scaled_data.pic->visual_map)
		gfxr_endianness_adjust(res->scaled_data.pic->visual_map, mode);

	return scaled ? res->scaled_data.pic : res->unscaled_data.pic;
}
#undef XLATE_AS_APPROPRIATE

gfxr_pic_t *gfxr_get_pic(gfx_resstate_t *state, int nr, int maps, int flags, int default_palette, int scaled) {
	gfxr_pic_t *npic = NULL;
	gfx_resource_type_t restype = GFX_RESOURCE_TYPE_PIC;
	sbtree_t *tree = state->resource_trees[restype];
	gfx_resource_t *res = NULL;
	int hash = gfxr_interpreter_options_hash(restype, state->version, state->options, 0);
	int must_post_process_pic = 0;
	int need_unscaled = (state->driver->mode->xfact != 1 || state->driver->mode->yfact != 1);

	if (!tree)
		return NULL;

	hash |= (flags << 20) | ((default_palette & 0x7) << 28);

	res = (gfx_resource_t *) sbtree_get(tree, nr);

	if (!res || res->mode != hash) {
		gfxr_pic_t *pic;
		gfxr_pic_t *unscaled_pic = NULL;

		if (state->options->pic0_unscaled) {
			need_unscaled = 0;
			pic = gfxr_interpreter_init_pic(state->version, &mode_1x1_color_index, GFXR_RES_ID(restype, nr));
		} else
			pic = gfxr_interpreter_init_pic(state->version, state->driver->mode, GFXR_RES_ID(restype, nr));

		if (!pic) {
			GFXERROR("Failed to allocate scaled pic!\n");
			return NULL;
		}

		gfxr_interpreter_clear_pic(state->version, pic);

		if (need_unscaled) {
			unscaled_pic = gfxr_interpreter_init_pic(state->version, &mode_1x1_color_index, GFXR_RES_ID(restype, nr));
			if (!unscaled_pic) {
				GFXERROR("Failed to allocate unscaled pic!\n");
				return NULL;
			}
			gfxr_interpreter_clear_pic(state->version, unscaled_pic);
		}
#ifdef TIME_PICDRAWING
		{
			uint32 start_msec, end_msec;
			start_msec = g_system->getMillis();
#endif
			if (gfxr_interpreter_calculate_pic(state, pic, unscaled_pic, flags, default_palette, nr)) {
				gfxr_free_pic(state->driver, pic);
				if (unscaled_pic)
					gfxr_free_pic(state->driver, unscaled_pic);

				return NULL;
			}
#ifdef TIME_PICDRAWING
			end_msec = g_system->getMillis();
			printf("\nTIME:	%d	ms for drawing pic.%03d\n", end_msec - start_msec, nr);
		}
#endif

		if (!res) {
			res = (gfx_resource_t *)sci_malloc(sizeof(gfx_resource_t));
			res->ID = GFXR_RES_ID(restype, nr);
			res->lock_sequence_nr = state->options->buffer_pics_nr;
			sbtree_set(tree, nr, (void *)res);
		} else {
			gfxr_free_pic(state->driver, res->scaled_data.pic);
			if (res->unscaled_data.pic)
				gfxr_free_pic(state->driver, res->unscaled_data.pic);
		}

		res->mode = hash;
		res->scaled_data.pic = pic;
		res->unscaled_data.pic = unscaled_pic;
	} else {
		res->lock_sequence_nr = state->options->buffer_pics_nr; // Update lock counter
	}

	must_post_process_pic = res->scaled_data.pic->visual_map->data == NULL;
	// If the pic was only just drawn, we'll have to endianness-adjust it now

	npic = gfxr_pic_xlate_common(res, maps, scaled || state->options->pic0_unscaled, 0, state->driver->mode,
	                             state->options->pic_xlate_filter, 0, state->options);


	if (must_post_process_pic) {
		gfxr_endianness_adjust(npic->visual_map, state->driver->mode);
	}

	return npic;
}

static void set_pic_id(gfx_resource_t *res, int id) {
	if (res->scaled_data.pic) {
		gfxr_pic_t *pic = res->scaled_data.pic;
		pic->control_map->ID = id;
		pic->priority_map->ID = id;
		pic->visual_map->ID = id;
	}

	if (res->unscaled_data.pic) {
		gfxr_pic_t *pic = res->unscaled_data.pic;
		pic->control_map->ID = id;
		pic->priority_map->ID = id;
		pic->visual_map->ID = id;
	}
}

static int get_pic_id(gfx_resource_t *res) {
	if (res->scaled_data.pic)
		return res->scaled_data.pic->visual_map->ID;
	else
		return res->unscaled_data.pic->visual_map->ID;
}

static void _gfxr_unscale_pixmap_index_data(gfx_pixmap_t *pxm, gfx_mode_t *mode) {
	int xmod = mode->xfact; // Step size horizontally
	int ymod = pxm->index_xl * mode->yfact; // Vertical step size
	int maxpos = pxm->index_xl * pxm->index_yl;
	int pos;
	byte *dest = pxm->index_data;

	if (!(pxm->flags & GFX_PIXMAP_FLAG_SCALED_INDEX))
		return; // It's not scaled!

	for (pos = 0; pos < maxpos; pos += ymod) {
		int c;

		for (c = 0; c < pxm->index_xl; c += xmod)
			*dest++ = pxm->index_data[pos + c];
			// No overwrite since line and offset readers move much faster (proof by in-duction, trivial
			// and left to the reader)
	}

	pxm->index_xl /= mode->xfact;
	pxm->index_yl /= mode->yfact;
	pxm->flags &= ~GFX_PIXMAP_FLAG_SCALED_INDEX;
}

gfxr_pic_t *gfxr_add_to_pic(gfx_resstate_t *state, int old_nr, int new_nr, int maps, int flags,
							int old_default_palette, int default_palette, int scaled) {
	gfx_resource_type_t restype = GFX_RESOURCE_TYPE_PIC;
	sbtree_t *tree = state->resource_trees[restype];
	gfxr_pic_t *pic = NULL;
	gfx_resource_t *res = NULL;
	int hash = gfxr_interpreter_options_hash(restype, state->version, state->options, 0);
	int need_unscaled = !(state->options->pic0_unscaled) && (state->driver->mode->xfact != 1 || state->driver->mode->yfact != 1);

	if (!tree) {
		GFXERROR("No pics registered\n");
		return NULL;
	}

	res = (gfx_resource_t *)sbtree_get(tree, old_nr);

	if (!res || (res->mode != MODE_INVALID && res->mode != hash)) {
		gfxr_get_pic(state, old_nr, 0, flags, old_default_palette, scaled);

		res = (gfx_resource_t *)sbtree_get(tree, old_nr);

		if (!res) {
			GFXWARN("Attempt to add pic %d to non-existing pic %d\n", new_nr, old_nr);
			return NULL;
		}
	}

	if (state->options->pic0_unscaled) // Unscale priority map, if we scaled it earlier
		_gfxr_unscale_pixmap_index_data(res->scaled_data.pic->priority_map, state->driver->mode);

	if (scaled) {
		res->lock_sequence_nr = state->options->buffer_pics_nr;

		gfxr_interpreter_calculate_pic(state, res->scaled_data.pic, need_unscaled ? res->unscaled_data.pic : NULL,
		                               flags | DRAWPIC01_FLAG_OVERLAID_PIC, default_palette, new_nr);
	}

	res->mode = MODE_INVALID; // Invalidate

	if (state->options->pic0_unscaled) // Scale priority map again, if needed
		res->scaled_data.pic->priority_map = gfx_pixmap_scale_index_data(res->scaled_data.pic->priority_map, state->driver->mode);
	{
		int old_ID = get_pic_id(res);
		set_pic_id(res, GFXR_RES_ID(restype, new_nr)); // To ensure that our graphical translation optoins work properly
		pic = gfxr_pic_xlate_common(res, maps, scaled, 1, state->driver->mode, state->options->pic_xlate_filter, 1, state->options);
		set_pic_id(res, old_ID);
	}

	return pic;
}


gfxr_view_t *gfxr_get_view(gfx_resstate_t *state, int nr, int *loop, int *cel, int palette) {
	gfx_resource_type_t restype = GFX_RESOURCE_TYPE_VIEW;
	sbtree_t *tree = state->resource_trees[restype];
	gfx_resource_t *res = NULL;
	int hash = gfxr_interpreter_options_hash(restype, state->version, state->options, palette);
	gfxr_view_t *view = NULL;
	gfxr_loop_t *loop_data = NULL;
	gfx_pixmap_t *cel_data = NULL;

	if (!tree)
		return NULL;

	res = (gfx_resource_t *) sbtree_get(tree, nr);

	if (!res || res->mode != hash) {
		view = gfxr_interpreter_get_view(state->resManager, nr, palette, state->static_palette, state->version);

		if (!view)
			return NULL;

		if (!res) {
			res = (gfx_resource_t *)sci_malloc(sizeof(gfx_resource_t));
			res->scaled_data.view = NULL;
			res->ID = GFXR_RES_ID(restype, nr);
			res->lock_sequence_nr = state->tag_lock_counter;
			res->mode = hash;
			sbtree_set(tree, nr, (void *)res);
		} else {
			gfxr_free_view(state->driver, res->unscaled_data.view);
		}

		res->mode = hash;
		res->unscaled_data.view = view;

	} else {
		res->lock_sequence_nr = state->tag_lock_counter; // Update lock counter
		view = res->unscaled_data.view;
	}

	if (*loop < 0)
		*loop = 0;
	else
		if (*loop >= view->loops_nr)
			*loop = view->loops_nr - 1;

	if (*loop < 0) {
		GFXWARN("View %d has no loops\n", nr);
		return NULL;
	}

	loop_data = view->loops + (*loop);
	if (loop_data == NULL) {
		GFXWARN("Trying to load invalid loop %d of view %d\n", *loop, nr);
		return NULL;
	}

	if (*cel < 0) {
		sciprintf("Resetting cel! %d\n", *cel);
		*cel = 0;
	} else
		if (*cel >= loop_data->cels_nr)
			*cel = loop_data->cels_nr - 1;

	if (*cel < 0) {
		GFXWARN("View %d loop %d has no cels\n", nr, *loop);
		return NULL;
	}

	cel_data = loop_data->cels[*cel];
	if (loop_data == NULL) {
		GFXWARN("Trying to load invalid view/loop/cel %d/%d/%d\n", nr, *loop, *cel);
		return NULL;
	}

	if (!cel_data->data) {
		gfx_get_res_config(state->options, cel_data);
		gfx_xlate_pixmap(cel_data, state->driver->mode, state->options->view_xlate_filter);
		gfxr_endianness_adjust(cel_data, state->driver->mode);
	}

	return view;
}

gfx_bitmap_font_t *gfxr_get_font(gfx_resstate_t *state, int nr, int scaled) {
	gfx_resource_type_t restype = GFX_RESOURCE_TYPE_FONT;
	sbtree_t *tree = NULL;
	gfx_resource_t *res = NULL;
	int hash;

	tree = state->resource_trees[restype];

	hash = gfxr_interpreter_options_hash(restype, state->version, state->options, 0);

	if (!tree)
		return NULL;

	res = (gfx_resource_t *)sbtree_get(tree, nr);

	if (!res || res->mode != hash) {
		gfx_bitmap_font_t *font = gfxr_interpreter_get_font(state->resManager, nr);

		if (!font)
			return NULL;

		if (!res) {
			res = (gfx_resource_t *)sci_malloc(sizeof(gfx_resource_t));
			res->scaled_data.font = NULL;
			res->ID = GFXR_RES_ID(restype, nr);
			res->lock_sequence_nr = state->tag_lock_counter;
			res->mode = hash;
			sbtree_set(tree, nr, (void *)res);
		} else {
			gfxr_free_font(res->unscaled_data.font);
		}

		res->unscaled_data.font = font;

		return font;
	} else {
		res->lock_sequence_nr = state->tag_lock_counter; // Update lock counter
		if (res->unscaled_data.pointer)
			return res->unscaled_data.font;
		else
			return res->scaled_data.font;
	}
}

gfx_pixmap_t *gfxr_get_cursor(gfx_resstate_t *state, int nr) {
	gfx_resource_type_t restype = GFX_RESOURCE_TYPE_CURSOR;
	sbtree_t *tree = state->resource_trees[restype];
	gfx_resource_t *res = NULL;
	int hash = gfxr_interpreter_options_hash(restype, state->version, state->options, 0);

	if (!tree)
		return NULL;

	res = (gfx_resource_t *)sbtree_get(tree, nr);

	if (!res || res->mode != hash) {
		gfx_pixmap_t *cursor = gfxr_interpreter_get_cursor(state->resManager, nr, state->version);

		if (!cursor)
			return NULL;

		if (!res) {
			res = (gfx_resource_t *)sci_malloc(sizeof(gfx_resource_t));
			res->scaled_data.pointer = NULL;
			res->ID = GFXR_RES_ID(restype, nr);
			res->lock_sequence_nr = state->tag_lock_counter;
			res->mode = hash;
			sbtree_set(tree, nr, (void *)res);
		} else {
			gfx_free_pixmap(state->driver, res->unscaled_data.pointer);
		}
		gfx_get_res_config(state->options, cursor);
		gfx_xlate_pixmap(cursor, state->driver->mode, state->options->cursor_xlate_filter);
		gfxr_endianness_adjust(cursor, state->driver->mode);

		res->unscaled_data.pointer = cursor;

		return cursor;
	} else {
		res->lock_sequence_nr = state->tag_lock_counter; // Update lock counter
		return res->unscaled_data.pointer;
	}
}

} // End of namespace Sci