/*
    CrossFire, A Multiplayer game for X-windows

    Copyright (C) 1994 Mark Wedel
    Copyright (C) 1992 Frank Tore Johansen

    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., 675 Mass Ave, Cambridge, MA 02139, USA.

    The author can be reached via e-mail to mark@pyramid.com
*/


/**
 * @file
 * The spiral room generator:
 * @todo
 * Check if MAX_FINE can't be removed.
 */
#include <global.h>
#include <random_map.h>

/**
 * @defgroup SPIRAL_xxx Random spiral map options
 */
/*@{*/
#define RANDOM_OPTIONS 0  /**< Pick random options below */
#define REGULAR_SPIRAL 1  /**< Regular spiral--distance increases constantly*/
#define FINE_SPIRAL 2     /**< uses the min. separation:  most coiling */
#define FIT_SPIRAL 4      /**< scale to a rectangular region, not square */
#define MAX_SPIRAL_OPT 8  /**< this should be 2x the last real option */
/*@}*/

#include <math.h>

#ifndef MIN
#define MIN(x, y) (((x) < (y)) ? (x) : (y))
#endif
#ifndef MAX
#define MAX(x, y) (((x) < (y)) ? (y) : (x))
#endif

#define MAX_FINE .454545

extern int surround_check(char **maze, int i, int j, int xsize, int ysize);

/**
 * Generates a spiral layout.
 * @param xsize
 * @param ysize
 * layout size.
 * @param option
 * combination of @ref SPIRAL_xxx "SPIRAL_xxx" values.
 * @return
 * generated layout.
 */
char **map_gen_spiral(int xsize, int ysize, int option) {
    int i, j;
    float parm = 0;
    float x = 0, y = 0;
    int ic, jc;
    float SizeX, SizeY;
    float xscale, yscale;

    /* allocate that array, set it up */
    char **maze = (char **)calloc(sizeof(char *), xsize);

    for (i = 0; i < xsize; i++) {
        maze[i] = (char *)calloc(sizeof(char), ysize);
    }

    /* slightly easier to fill and then cut */
    for (i = 0; i < xsize; i++)
        for (j = 0; j < ysize; j++)
            maze[i][j] = '#';

    ic = xsize/2;
    jc = ysize/2;
    SizeX = xsize/2-2;
    SizeY = ysize/2-2;

    /* select random options if necessary */
    if (option == 0) {
        option = RANDOM()%MAX_SPIRAL_OPT;
    }

    /* the order in which these are evaluated matters*/

    /* the following two are mutually exclusive.
       pick one if they're both set. */
    if ((option&REGULAR_SPIRAL) && (option&FIT_SPIRAL)) {
        /* unset REGULAR_SPIRAL half the time */
        if (RANDOM()%2 && (option&REGULAR_SPIRAL))
            option -= REGULAR_SPIRAL;
        else
            option -= FIT_SPIRAL;
    }

    xscale = yscale = MAX_FINE;  /* fine spiral */

    /* choose the spiral pitch */
    if (!(option&FINE_SPIRAL)) {
        float pitch = (RANDOM()%5)/10.+10./22.;

        xscale = yscale = pitch;
    }

    if ((option&FIT_SPIRAL) && (xsize != ysize)) {
        if (xsize > ysize)
            xscale *= (float)xsize/(float)ysize;
        else
            yscale *= (float)ysize/(float)xsize;
    }

    if (option&REGULAR_SPIRAL) {
        float scale = MIN(xscale, yscale);

        xscale = yscale = scale;
    }

    /* cut out the spiral */
    while ((abs(x) < SizeX) && (abs(y) < SizeY)) {
        x = parm*cos(parm)*xscale;
        y = parm*sin(parm)*yscale;
        maze[(int)(ic+x)][(int)(jc+y)] = '\0';
        parm += 0.01;
    };

    maze[(int)(ic+x+0.5)][(int)(jc+y+0.5)] = '<';

    /* cut out the center in a 2x2 and place the center and downexit */
    maze[ic][jc+1] = '>';
    maze[ic][jc] = 'C';

    return maze;
}

/**
 * Connects disjoint spirals which may result from the symmetrization process.
 * @param xsize
 * @param ysize
 * layout size.
 * @param sym
 * one of the @ref SYM_xxx "SYM_xxx" values.
 * @param layout
 * layout to alter.
 */
void connect_spirals(int xsize, int ysize, int sym, char **layout) {
    int i, j, ic = xsize/2, jc = ysize/2;

    if (sym == X_SYM) {
        layout[ic][jc] = 0;
        /* go left from map center */
        for (i = ic-1, j = jc; i > 0 && layout[i][j] == '#'; i--)
            layout[i][j] = 0;
        /* go right */
        for (i = ic+1, j = jc; i < xsize-1 && layout[i][j] == '#'; i++)
            layout[i][j] = 0;
    }

    if (sym == Y_SYM) {
        layout[ic][jc] = 0;
        /* go up */
        for (i = ic, j = jc-1; j > 0 && layout[i][j] == '#'; j--)
            layout[i][j] = 0;
        /* go down */
        for (i = ic, j = jc+1; j < ysize-1 && layout[i][j] == '#'; j++)
            layout[i][j] = 0;
    }

    if (sym == XY_SYM) {
        /* go left from map center */
        layout[ic][jc/2] = 0;
        layout[ic/2][jc] = 0;
        layout[ic][jc/2+jc] = 0;
        layout[ic/2+ic][jc] = 0;
        for (i = ic-1, j = jc/2; i > 0 && layout[i][j] == '#'; i--) {
            layout[i][j+jc] = 0;
            layout[i][j] = 0;
        }
        /* go right */
        for (i = ic+1, j = jc/2; i < xsize-1 && layout[i][j] == '#'; i++) {
            layout[i][j+jc] = 0;
            layout[i][j] = 0;
        }
        /* go up */
        for (i = ic/2, j = jc-1; j > 0 && layout[i][j] == '#'; j--) {
            layout[i][j] = 0;
            layout[i+ic][j] = 0;
        }
        /* go down */
        for (i = ic/2, j = jc+1; j < ysize-1 && layout[i][j] == '#'; j++) {
            layout[i][j] = 0;
            layout[i+ic][j] = 0;
        }
    }

    /* get rid of bad doors. */
    for (i = 0; i < xsize; i++)
        for (j = 0; j < ysize; j++) {
            if (layout[i][j] == 'D') { /* remove bad door. */
                int si = surround_check(layout, i, j, xsize, ysize);
                if (si != 3 && si != 12) {
                    layout[i][j] = 0;
                    /* back up and recheck any nearby doors */
                    i = 0;
                    j = 0;
                }
            }
        }
}