/**
 * Navit, a modular navigation system.
 * Copyright (C) 2005-2008 Navit Team
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * 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 Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library 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.
 */

#ifndef NAVIT_MAP_H
#define NAVIT_MAP_H

struct map_priv;
struct attr;
#include "coord.h"
#include "point.h"
#include "layer.h"

/**
 * @brief Used to select data from a map
 *
 * This struct is used to select data from a map. This one the one hand builds a
 * rectangle on the map and on the other hand selects an order for items of each
 * layer. Note that passing NULL instead of a pointer to such a struct often means
 * "get me everything".
 *
 * It's possible to link multiple selections in a linked list, see below.
 */
struct map_selection {
	struct map_selection *next;     /** Linked-List pointer */
	union {
		struct coord_rect c_rect;   /** For building the rectangle based on coordinates */
		struct point_rect p_rect;   /** For building the rectangle based on points */
	} u;
	int order[layer_end];		    /** Holds the order to be selected for each layer of items */
};

/**
 * @brief Holds all functions a map plugin has to implement to be useable
 *
 * This structure holds pointers to a map plugin's functions navit's core will call
 * to communicate with the plugin. For further information look into map.c - there exist
 * functions with the same names acting more or less as "wrappers" around the functions here.
 * Especially the arguments (and their meaning) of each function will be described there.
 */
struct map_methods {
	enum projection pro;        /** The projection used for that type of map */
	char *charset;              /** The charset this map uses - e.g. "iso8859-1" or "utf-8". Please specify this in a form so that g_convert() can handle it. */
	void 			(*map_destroy)(struct map_priv *priv);  /** Function used to destroy ("close") a map. */
	struct map_rect_priv *  (*map_rect_new)(struct map_priv *map, struct map_selection *sel); /** Function to create a new map rect on the map. */
	void			(*map_rect_destroy)(struct map_rect_priv *mr); /** Function to destroy a map rect */
	struct item *		(*map_rect_get_item)(struct map_rect_priv *mr); /** Function to return the next item from a map rect */
	struct item *		(*map_rect_get_item_byid)(struct map_rect_priv *mr, int id_hi, int id_lo); /** Function to get an item with a specific ID from a map rect */
	struct map_search_priv *(*map_search_new)(struct map_priv *map, struct item *item, struct attr *search, int partial); /** Function to start a new search on the map */
	void			(*map_search_destroy)(struct map_search_priv *ms); /** Function to destroy a map search struct */
	struct item *		(*map_search_get_item)(struct map_search_priv *ms); /** Function to get the next item of a search on the map */
};

/**
 * @brief Checks if a coordinate is within a map selection
 *
 * Checks if a coordinate is within a map selection. Note that since a selection of NULL
 * means "select everything", with sel = NULL this will always return true. If there are
 * more than one selection in a linked-list, it is sufficient if only one of the selections
 * contains the coordinate.
 *
 * @param sel The selection to check if the point is within
 * @param c Coordinate to check if it is within the selection
 * @return True if the coordinate is within one of the selections, False otherwise
 */
static inline int
map_selection_contains_point(struct map_selection *sel, struct coord *c)
{
	struct map_selection *curr=sel;
        while (curr) {
                struct coord_rect *r=&curr->u.c_rect;
                if (c->x >= r->lu.x && c->x <= r->rl.x &&
                    c->y <= r->lu.y && c->y >= r->rl.y)
                        return 1;
                curr=curr->next;
        }
        return sel ? 0:1;
}

/**
 * @brief Checks if a polyline is within a map selection
 *
 * @sa Please refer to map_selection_contains_point()
 *
 * @param sel The selection to check if the polyline is within
 * @param c Coordinates of the polyline to check if it is within the selection
 * @param count Number of coordinates in c
 * @return True if the polyline is within one of the selections, False otherwise
 */
static inline int
map_selection_contains_polyline(struct map_selection *sel, struct coord *c, int count)
{
	int i,x_mi,x_ma,y_mi,y_ma;
	struct map_selection *curr;

	if (! sel)
		return 1;
	for (i = 0 ; i < count-1 ; i++) {
		x_mi=c[i].x;
		if (c[i+1].x < x_mi)
			x_mi=c[i+1].x;
		x_ma=c[i].x;
		if (c[i+1].x > x_ma)
			x_ma=c[i+1].x;
		y_mi=c[i].y;
		if (c[i+1].y < y_mi)
			y_mi=c[i+1].y;
		y_ma=c[i].y;
		if (c[i+1].y > y_ma)
			y_ma=c[i+1].y;
		curr=sel;
		while (curr) {
			struct coord_rect *sr=&curr->u.c_rect;
			if (x_mi <= sr->rl.x && x_ma >= sr->lu.x &&
			    y_ma >= sr->rl.y && y_mi <= sr->lu.y)
				return 1;
			curr=curr->next;
		}
	}
	return 0;
}

/**
 * @brief Checks if a rectangle is within a map selection
 *
 * @sa Please refer to map_selection_contains_point()
 *
 * @param sel The selection to check if the rectangle is within
 * @param r Rectangle to be checked for
 * @return True if the rectangle is within one of the selections, False otherwise
 */
static inline int
map_selection_contains_rect(struct map_selection *sel, struct coord_rect *r)
{
	struct map_selection *curr;

	g_assert(r->lu.x <= r->rl.x);
	g_assert(r->lu.y >= r->rl.y);

	if (! sel)
		return 1;
	curr=sel;
	while (curr) {
		struct coord_rect *sr=&curr->u.c_rect;
		g_assert(sr->lu.x <= sr->rl.x);
		g_assert(sr->lu.y >= sr->rl.y);
		if (r->lu.x <= sr->rl.x && r->rl.x >= sr->lu.x &&
		    r->lu.y >= sr->rl.y && r->rl.y <= sr->lu.y)
			return 1;
		curr=curr->next;
	}
	return 0;
}


/**
 * @brief Checks if a polygon is within a map selection
 *
 * @sa Please refer to map_selection_contains_point()
 *
 * @param sel The selection to check if the polygon  is within
 * @param c Pointer to coordinates of the polygon
 * @param count Number of coordinates in c
 * @return True if the polygon is within one of the selections, False otherwise
 */
static inline int
map_selection_contains_polygon(struct map_selection *sel, struct coord *c, int count)
{
	struct coord_rect r;
	int i;

	if (! sel)
		return 1;
	if (! count)
		return 0;
	r.lu=c[0];
	r.rl=c[0];
	for (i = 1 ; i < count ; i++) {
		if (c[i].x < r.lu.x)
			r.lu.x=c[i].x;
		if (c[i].x > r.rl.x)
			r.rl.x=c[i].x;
		if (c[i].y < r.rl.y)
			r.rl.y=c[i].y;
		if (c[i].y > r.lu.y)
			r.lu.y=c[i].y;
	}
	return map_selection_contains_rect(sel, &r);
}

/* prototypes */
enum attr_type;
enum projection;
struct attr;
struct attr_iter;
struct callback;
struct item;
struct map;
struct map_priv;
struct map_rect;
struct map_search;
struct map_selection;
struct map *map_new(struct attr **attrs);
char *map_get_filename(struct map *this_);
char *map_get_type(struct map *this_);
int map_get_active(struct map *this_);
void map_set_active(struct map *this_, int active);
int map_get_attr(struct map *this_, enum attr_type type, struct attr *attr, struct attr_iter *iter);
int map_set_attr(struct map *this_, struct attr *attr);
void map_add_callback(struct map *this_, struct callback *cb);
void map_remove_callback(struct map *this_, struct callback *cb);
int map_requires_conversion(struct map *this_);
char *map_convert_string(struct map *this_, char *str);
void map_convert_free(char *str);
enum projection map_projection(struct map *this_);
void map_set_projection(struct map *this_, enum projection pro);
void map_destroy(struct map *m);
struct map_rect *map_rect_new(struct map *m, struct map_selection *sel);
struct item *map_rect_get_item(struct map_rect *mr);
struct item *map_rect_get_item_byid(struct map_rect *mr, int id_hi, int id_lo);
void map_rect_destroy(struct map_rect *mr);
struct map_search *map_search_new(struct map *m, struct item *item, struct attr *search_attr, int partial);
struct item *map_search_get_item(struct map_search *this_);
void map_search_destroy(struct map_search *this_);
struct map_selection *map_selection_rect_new(struct pcoord *center, int distance, int order);
struct map_selection *map_selection_dup_pro(struct map_selection *sel, enum projection from, enum projection to);
struct map_selection *map_selection_dup(struct map_selection *sel);
void map_selection_destroy(struct map_selection *sel);
int map_selection_contains_item_rect(struct map_selection *sel, struct item *item);
int map_priv_is(struct map *map, struct map_priv *priv);
/* end of prototypes */

#endif