/*!
   \file header.c

   \brief Vector library - header manipulation

   Higher level functions for reading/writing/manipulating vectors.

   (C) 2001-2009 by the GRASS Development Team

   This program is free software under the GNU General Public License
   (>=v2).  Read the file COPYING that comes with GRASS for details.

   \author Original author CERL, probably Dave Gerdes or Mike Higgins.
   \author Update to GRASS 5.7 Radim Blazek and David D. Gray.
 */

#include <grass/config.h>
#include <stdlib.h>
#include <string.h>
#include <grass/gis.h>
#include <grass/vector.h>
#include <grass/glocale.h>

static int lookup(const char *file, const char *key, char *value, size_t len);


/*!
   \brief Print vector map header

   \param Map vector map

   \return 0 on success
 */
int Vect_print_header(const struct Map_info *Map)
{
    fprintf(stdout, "\nSelected information from dig header\n");
    fprintf(stdout, " Organization:  %s\n", Vect_get_organization(Map));
    fprintf(stdout, " Map Name:      %s\n", Vect_get_map_name(Map));
    fprintf(stdout, " Source Date:   %s\n", Vect_get_map_date(Map));
    fprintf(stdout, " Orig. Scale:   %d\n", Vect_get_scale(Map));

    return 0;
}


/*!
   \brief Read vector map header from map head file

   \param Map vector map

   \return 0
 */
int Vect_read_header(struct Map_info *Map)
{
    Vect__read_head(Map);
    return 0;
}


/*!
   \brief Write vector map header to map head file

   \param Map vector map

   \return 0
 */
int Vect_write_header(const struct Map_info *Map)
{
    /* do some sanity checking here */
    Vect__write_head(Map);
    return 0;
}


/*! 
   \brief Writes head information to text file.

   \param Map vector map

   \return GRASS_OK on success
   \return GRASS_ERR on error
 */
int Vect__write_head(const struct Map_info *Map)
{
    char buf[GPATH_MAX];
    FILE *head_fp;

    sprintf(buf, "%s/%s", GRASS_VECT_DIRECTORY, Map->name);

    head_fp = G_fopen_new(buf, GRASS_VECT_HEAD_ELEMENT);
    if (head_fp == NULL) {
	G_warning(_("Unable to open header file of vector <%s>"),
		  Vect_get_full_name(Map));
	return (GRASS_ERR);
    }

    fprintf(head_fp, "ORGANIZATION: %s\n", Vect_get_organization(Map));
    fprintf(head_fp, "DIGIT DATE:   %s\n", Vect_get_date(Map));
    fprintf(head_fp, "DIGIT NAME:   %s\n", Vect_get_person(Map));
    fprintf(head_fp, "MAP NAME:     %s\n", Vect_get_map_name(Map));
    fprintf(head_fp, "MAP DATE:     %s\n", Vect_get_map_date(Map));
    fprintf(head_fp, "MAP SCALE:    %d\n", Vect_get_scale(Map));
    fprintf(head_fp, "OTHER INFO:   %s\n", Vect_get_comment(Map));
    fprintf(head_fp, "ZONE:         %d\n", Vect_get_zone(Map));
    fprintf(head_fp, "MAP THRESH:   %f\n", Vect_get_thresh(Map));

    fclose(head_fp);
    return (GRASS_OK);
}

/*!
   \brief Reads head information from text file (GRASS_VECT_HEAD_ELEMENT).

   \param Map vector map

   \return GRASS_OK on success
   \return GRASS_ERR on error
 */
int Vect__read_head(struct Map_info *Map)
{
    FILE *head_fp;
    char buff[GPATH_MAX];
    char *ptr;

    /* Reset / init */
    Vect_set_organization(Map, "");
    Vect_set_date(Map, "");
    Vect_set_person(Map, "");
    Vect_set_map_name(Map, "");
    Vect_set_map_date(Map, "");
    Vect_set_scale(Map, 1);
    Vect_set_comment(Map, "");
    Vect_set_zone(Map, 0);
    Vect_set_thresh(Map, 0.);

    G_debug(1, "Vect__read_head(): vector = %s@%s", Map->name, Map->mapset);
    sprintf(buff, "%s/%s", GRASS_VECT_DIRECTORY, Map->name);
    head_fp = G_fopen_old(buff, GRASS_VECT_HEAD_ELEMENT, Map->mapset);
    if (head_fp == NULL) {
	G_warning(_("Unable to open header file of vector <%s>"),
		  Vect_get_full_name(Map));
	return (GRASS_ERR);
    }

    while (G_getl2(buff, 2000, head_fp)) {

	if (!(ptr = G_index(buff, ':'))) {
	    G_warning(_("Corrupted row in head: %s"), buff);
	    continue;
	}

	ptr++;			/* Search for the start of text */
	while (*ptr == ' ')
	    ptr++;

	if (strncmp(buff, "ORGANIZATION:", sizeof(char) * 12) == 0)
	    Vect_set_organization(Map, ptr);
	else if (strncmp(buff, "DIGIT DATE:", sizeof(char) * 11) == 0)
	    Vect_set_date(Map, ptr);
	else if (strncmp(buff, "DIGIT NAME:", sizeof(char) * 11) == 0)
	    Vect_set_person(Map, ptr);
	else if (strncmp(buff, "MAP NAME:", sizeof(char) * 9) == 0)
	    Vect_set_map_name(Map, ptr);
	else if (strncmp(buff, "MAP DATE:", sizeof(char) * 9) == 0)
	    Vect_set_map_date(Map, ptr);
	else if (strncmp(buff, "MAP SCALE:", sizeof(char) * 10) == 0)
	    Vect_set_scale(Map, atoi(ptr));
	else if (strncmp(buff, "OTHER INFO:", sizeof(char) * 11) == 0)
	    Vect_set_comment(Map, ptr);
	else if (strncmp(buff, "ZONE:", sizeof(char) * 5) == 0 ||
		 strncmp(buff, "UTM ZONE:", sizeof(char) * 9) == 0)
	    Vect_set_zone(Map, atoi(ptr));
	else if (strncmp(buff, "WEST EDGE:", sizeof(char) * 10) == 0) {
	}
	else if (strncmp(buff, "EAST EDGE:", sizeof(char) * 10) == 0) {
	}
	else if (strncmp(buff, "SOUTH EDGE:", sizeof(char) * 11) == 0) {
	}
	else if (strncmp(buff, "NORTH EDGE:", sizeof(char) * 11) == 0) {
	}
	else if (strncmp(buff, "MAP THRESH:", sizeof(char) * 11) == 0)
	    Vect_set_thresh(Map, atof(ptr));
	else
	    G_warning(_("Unknown keyword %s in vector head"), buff);
    }

    fclose(head_fp);
    return (GRASS_OK);
}

/*!
   \brief Get map name

   \param Map vector map

   \return poiter to map name
 */
const char *Vect_get_name(const struct Map_info *Map)
{
    return (Map->name);
}

/*!
   \brief Get mapset name

   \param Map vector map

   \return poiter to mapset name
 */
const char *Vect_get_mapset(const struct Map_info *Map)
{
    return (Map->mapset);
}

/*!
   \brief Get full map name

   Allocated string should be freed by G_free().
   \param Map vector map

   \return poiter to map name (name@mapset)
 */
const char *Vect_get_full_name(const struct Map_info *Map)
{
    char *ptr;

    ptr = (char *)G_malloc(strlen(Map->name) + strlen(Map->mapset) + 2);
    sprintf(ptr, "%s@%s", Map->name, Map->mapset);
    return (ptr);
}

/*!
   \brief Check if vector map is 3D (with z)

   \param Map vector map

   \return 1 map is 3D
   \return 0 map is not 3D
 */
int Vect_is_3d(const struct Map_info *Map)
{
    return (Map->head.with_z);
}

/*!
   \brief Set organization string in map header

   \param Map vector map
   \param str organization name

   \return 0
 */
int Vect_set_organization(struct Map_info *Map, const char *str)
{
    G_free(Map->head.organization);
    Map->head.organization = G_store(str);

    return 0;
}

/*!
   \brief Get organization string from map header

   \param Map vector map

   \return organization string
 */
const char *Vect_get_organization(const struct Map_info *Map)
{
    return (Map->head.organization);
}

/*!
   \brief Set date of digitization string in map header

   SUGGESTION: this should be coupled to DateTime functions to support
   time series

   \param Map vector map
   \param str data string

   \return 0
 */
int Vect_set_date(struct Map_info *Map, const char *str)
{
    G_free(Map->head.date);
    Map->head.date = G_store(str);

    return 0;
}

/*!
   \brief Get date of digitization string from map header

   SUGGESTION: this should be coupled to DateTime functions to support
   time series

   \param Map vector map

   \return date of digitization string
 */
const char *Vect_get_date(const struct Map_info *Map)
{
    return (Map->head.date);
}

/*!
   \brief Set user name string who digitized the map in map header

   \param Map vector map
   \param str user name string

   \return 0 on success
 */
int Vect_set_person(struct Map_info *Map, const char *str)
{
    G_free(Map->head.your_name);
    Map->head.your_name = G_store(str);

    return 0;
}

/*!
   \brief Get user name string who digitized the map from map header

   \param Map vector map

   \return user name string
 */
const char *Vect_get_person(const struct Map_info *Map)
{
    return (Map->head.your_name);
}

/*!
   \brief Set map name string in map header

   \param Map vector map
   \param str map name string

   \return 0 on success
 */
int Vect_set_map_name(struct Map_info *Map, const char *str)
{
    G_free(Map->head.map_name);
    Map->head.map_name = G_store(str);
    
    return 0;
}

/*!
   \brief Get map name string in map header

   \param Map vector map

   \return map name string
 */
const char *Vect_get_map_name(const struct Map_info *Map)
{
    return (Map->head.map_name);
}

/*!
   \brief Set date string when the source map was originally produced in map header

   \param Map vector map
   \param str date when the source map was originally produced string

   \return 0 on success
 */
int Vect_set_map_date(struct Map_info *Map, const char *str)
{
    G_free(Map->head.source_date);
    Map->head.source_date = G_store(str);
    
    return 0;
}

/*!
   \brief Get date string when the source map was originally produced in map header

   \param Map vector map

   \return date when the source map was originally produced string
 */
const char *Vect_get_map_date(const struct Map_info *Map)
{
    return (Map->head.source_date);
}

/*!
   \brief Set map scale in map header

   \param Map vector map
   \param map scale

   \return 0 on success
 */
int Vect_set_scale(struct Map_info *Map, int scale)
{
    Map->head.orig_scale = scale;
    
    return 0;
}

/*!
   \brief Get map scale from map header

   \param Map vector map

   \return map scale
 */
int Vect_get_scale(const struct Map_info *Map)
{
    return ((int) Map->head.orig_scale);
}

/*!
   \brief Set comment or other info string in map header

   \param Map vector map
   \param str comment or other info string

   \return 0 on success
 */
int Vect_set_comment(struct Map_info *Map, const char *str)
{
    G_free(Map->head.line_3);
    Map->head.line_3 = G_store(str);
    
    return 0;
}

/*!
   \brief Get comment or other info string from map header

   \param Map vector map

   \return comment or other info string
 */
const char *Vect_get_comment(const struct Map_info *Map)
{
    return (Map->head.line_3);
}

/*!
   \brief Set projection zone in map header

   \param Map vector map
   \param zone projection zone

   \return 0 on success
 */
int Vect_set_zone(struct Map_info *Map, int zone)
{
    Map->head.plani_zone = zone;
    
    return 0;
}


/*!
   \brief Get projection zone from map header

   \param Map vector map

   \return projection zone
 */
int Vect_get_zone(const struct Map_info *Map)
{
    return (Map->head.plani_zone);
}

/*!
   \brief Get projection from map header

   \param Map vector map

   \return PROJECTION_XY  - x,y (Raw imagery),
   \return PROJECTION_UTM - UTM   Universal Transverse Mercator,
   \return PROJECTION_SP  - State Plane (in feet),
   \return PROJECTION_LL  - Latitude-Longitude
 */
int Vect_get_proj(const struct Map_info *Map)
{
    return (Map->proj);
}


/*!
   \brief Query cartographic projection name of vector map

   Returns a pointer to a string which is a printable name for
   projection code <em>proj</em> (as returned by
   Vect_get_proj()).

   \param Map vector map

   \return poiter to projection name
   \return NULL if <em>proj</em> is not a valid projection
 */

const char *Vect_get_proj_name(const struct Map_info *Map)
{
    char name[256];
    int n;

    switch (n = Vect_get_proj(Map)) {
    case PROJECTION_XY:
    case PROJECTION_UTM:
    case PROJECTION_LL:
    case PROJECTION_SP:
	return G__projection_name(n);
    }
    if (!lookup(PROJECTION_FILE, "name", name, sizeof(name)))
	strcpy(name, _("Unknown projection"));

    return G_store(name);
}

/*!
   \brief Set threshold used for digitization in map header

   \param Map vector map
   \param thresh threshold used for digitization

   \return 0 on success
 */
int Vect_set_thresh(struct Map_info *Map, double thresh)
{
    G_debug(1, "Vect_set_thresh(): thresh = %f", thresh);
    Map->head.digit_thresh = thresh;
    return (0);
}

/*!
   \brief Get threshold used for digitization from map header

   \param Map vector map

   \return threshold used for digitization
 */
double Vect_get_thresh(const struct Map_info *Map)
{
    G_debug(1, "Vect_get_thresh(): thresh = %f", Map->head.digit_thresh);
    return (Map->head.digit_thresh);
}


/* from lib/gis/proj3.c */
static int lookup(const char *file, const char *key, char *value, size_t len)
{
    char path[GPATH_MAX];

    G__file_name(path, "", file, "PERMANENT");
    return G_lookup_key_value_from_file(path, key, value, (int)len) == 1;
}