/* parse the "region" instruction */

#include <string.h>
#include <grass/colors.h>
#include <grass/raster.h>
#include "local_proto.h"

#define KEY(x) (strcmp(key, x) == 0)

static char *help[] = {"color  color", "width  #", ""};

int read_wind(char *name, char *mapset)
{
    char fullname[100];
    char buf[1024];
    char *key, *data;
    double width;
    int r, g, b;
    int color_R, color_G, color_B;
    int ret;
    int i;
    double east, west, incr;
    struct Cell_head window;

    sprintf(fullname, "%s in %s", name, mapset);

    G_get_element_window(&window, "windows", name, mapset);

    width = 1.;
    color_R = color_G = color_B = 0;

    while (input(2, buf, help)) {
        if (!key_data(buf, &key, &data))
            continue;

        if (KEY("width")) {
            width = -1.;
            *mapset = 0;
            if (sscanf(data, "%lf%s", &width, mapset) < 1 || width < 0.) {
                width = 1.;
                error(key, data, "illegal width (wind)");
            }
            if (mapset[0] == 'i')
                width = width / 72.0;
            continue;
        }

        if (KEY("color")) {
            ret = G_str_to_color(data, &r, &g, &b);
            if (ret == 1) {
                color_R = r;
                color_G = g;
                color_B = b;
            }
            else if (ret == 2) /* i.e. "none" */
                color_R = color_G = color_B = -1;
            else
                error(key, data, "illegal color request (wind)");

            continue;
        }
        error(key, "", "illegal request (wind)");
    }

    /* draw horizontal lines in 3 pieces - lat-lon lines must not
     * extend more than half the globe
     */
    west = window.west;
    incr = (window.east - window.west) / 3;
    for (i = 0; i < 3; i++) {
        east = west + incr;
        sprintf(buf, "L 0 %f %f %f %f %d %d %d %.8f", west, window.north, east,
                window.north, color_R, color_G, color_B, width);
        add_to_plfile(buf);

        sprintf(buf, "L 0 %f %f %f %f %d %d %d %.8f", west, window.south, east,
                window.south, color_R, color_G, color_B, width);
        add_to_plfile(buf);

        west = east;
    }

    sprintf(buf, "L 0 %f %f %f %f %d %d %d %.8f", window.east, window.north,
            window.east, window.south, color_R, color_G, color_B, width);
    add_to_plfile(buf);

    sprintf(buf, "L 0 %f %f %f %f %d %d %d %.8f", window.west, window.north,
            window.west, window.south, color_R, color_G, color_B, width);
    add_to_plfile(buf);

    return 1;
}
