/**
 * \file daemon.c
 *
 * \brief Implementation of the server for parallel
 * computing of r.li raster analysis
 *
 * \author Claudio Porta & Lucio Davide Spano
 *
 * This program is free software under the GPL (>=v2)
 * Read the COPYING file that comes with GRASS for details.
 *
 * \version 1.0
 *
 * \include
 * 
 */
#include <grass/config.h>
#include <stdlib.h>
#include <stddef.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <errno.h>
#include <math.h>

#ifdef __MINGW32__
#include <process.h>
#else
#include <sys/wait.h>
#endif

#include <grass/gis.h>
#include <grass/raster.h>
#include <grass/glocale.h>
#include "daemon.h"

#ifdef __MINGW32__
#define srandom srand
#define random rand
#endif

int calculateIndex(char *file, int f(int, char **, struct area_entry *, double *),
		   char **parameters, char *raster, char *output)
{

    char pathSetup[GPATH_MAX], out[GPATH_MAX], parsed;
    char *random_access_name;
    struct History history;
    struct g_area *g;
    int res;
    int i, doneDir, mv_fd, random_access;

    /*int mv_rows, mv_cols; */
    struct list *l;
    msg m, doneJob;

    /* int perc=0; */

    g = (struct g_area *) G_malloc(sizeof(struct g_area));
    g->maskname = NULL;
    l = (struct list*) G_malloc(sizeof(struct list));
    l->head = NULL;
    l->tail = NULL;
    l->size = 0;

    worker_init(raster, f, parameters);

    /*########################################################      
       -----------------create area queue----------------------
       ######################################################### */

    /* strip off leading path if present */
    char testpath[GPATH_MAX];

    sprintf(testpath, "%s%s", G_home(), "/.grass7/r.li/");
    if (strncmp(file, testpath, strlen(testpath)) == 0)
	file += strlen(testpath);

    /* TODO: check if this path is portable */
    /* TODO: use G_rc_path() */
    sprintf(pathSetup, "%s/.grass7/r.li/%s", G_home(), file);
    G_debug(1, "r.li.daemon pathSetup: [%s]", pathSetup);
    parsed = parseSetup(pathSetup, l, g, raster);


    /*########################################################
       -----------------open output file ---------------------
       ####################################################### */

    if (parsed == MVWIN) {
	/* struct Cell_head cellhd_r, cellhd_new;
	   char *mapset; */
	/*creating new raster file */
	mv_fd = Rast_open_new(output, DCELL_TYPE);

	random_access_name = G_tempfile();
	random_access = open(random_access_name, O_RDWR | O_CREAT, 0755);
	if (random_access == -1)
	    G_fatal_error(_("Cannot create random access file"));
    }
    else {
	/* check if ~/.grass7/ exists */
	sprintf(out, "%s/.grass7/", G_home());
	doneDir = G_mkdir(out);
	if (doneDir == -1 && errno != EEXIST)
	    G_fatal_error(_("Cannot create %s/.grass7/ directory"), G_home());

	/* check if ~/.grass7/r.li/ exists */
	sprintf(out, "%s/.grass7/r.li/", G_home());
	doneDir = G_mkdir(out);
	if (doneDir == -1 && errno != EEXIST)
	    G_fatal_error(_("Cannot create %s/.grass7/r.li/ directory"),
			  G_home());

	/* check if ~/.grass7/r.li/output exists */
	sprintf(out, "%s/.grass7/r.li/output", G_home());
	doneDir = G_mkdir(out);
	if (doneDir == -1 && errno != EEXIST)
	    G_fatal_error(_("Cannot create %s/.grass7/r.li/output/ directory"),
			  G_home());
	sprintf(out, "%s/.grass7/r.li/output/%s", G_home(), output);
	res = open(out, O_WRONLY | O_CREAT | O_TRUNC, 0644);
    }
    i = 0;

    /*#######################################################
       ------------------analysis loop----------------------
       ####################################################### */

    /*body */
    while (next_Area(parsed, l, g, &m) != 0) {
	worker_process(&doneJob, &m);

	/*perc++; */
	/*G_percent (perc, WORKERS, 1); */
	if (doneJob.type == DONE) {
	    double result;

	    result = doneJob.f.f_d.res;
	    /*output */
	    if (parsed != MVWIN) {
		print_Output(res, doneJob);
	    }
	    else {
		/*raster output */
		raster_Output(random_access, doneJob.f.f_d.aid, g,
			      doneJob.f.f_d.res);
	    }
	}
	else {
	    if (parsed != MVWIN) {
		error_Output(res, doneJob);
	    }
	    else {
		/*printf("todo ");fflush(stdout); *//* TODO scrivere su raster NULL ??? */
	    }
	}
    }

    worker_end();

    /*################################################
       --------------delete tmp files------------------
       ################################################ */

    if (parsed == MVWIN) {
	write_raster(mv_fd, random_access, g);
	close(random_access);
	unlink(random_access_name);
	Rast_close(mv_fd);
	Rast_short_history(output, "raster", &history);
	Rast_command_history(&history);
	Rast_write_history(output, &history);
    }

    return 1;
}


int parseSetup(char *path, struct list *l, struct g_area *g, char *raster)
{
    STRUCT_STAT s;
    struct Cell_head cellhd;
    char *buf;
    const char *token;
    int setup;
    int letti;
    double rel_x, rel_y, rel_rl, rel_cl;
    double sf_n, sf_s, sf_e, sf_w;
    int sf_x, sf_y, sf_rl, sf_cl;
    int size;

    if (stat(path, &s) != 0)
	G_fatal_error(_("Cannot find configuration file <%s>"), path);

    size = s.st_size * sizeof(char);
    buf = G_malloc(size);

    setup = open(path, O_RDONLY, 0755);
    if (setup == -1)
	G_fatal_error(_("Cannot read setup file"));

    letti = read(setup, buf, s.st_size);
    if (letti < s.st_size)
	G_fatal_error(_("Cannot read setup file"));

    token = strtok(buf, " ");
    if (strcmp("SAMPLINGFRAME", token) != 0)
	G_fatal_error(_("Unable to parse configuration file"));

    rel_x = atof(strtok(NULL, "|"));
    rel_y = atof(strtok(NULL, "|"));
    rel_rl = atof(strtok(NULL, "|"));
    rel_cl = atof(strtok(NULL, "\n"));

    /* find raster map */
    Rast_get_cellhd(raster, "", &cellhd);

    /* calculate absolute sampling frame definition */
    sf_x = (int)rint(cellhd.cols * rel_x);
    sf_y = (int)rint(cellhd.rows * rel_y);
    sf_rl = (int)rint(cellhd.rows * rel_rl);
    sf_cl = (int)rint(cellhd.cols * rel_cl);

    /* calculate sample frame boundaries */
    sf_n = cellhd.north - (cellhd.ns_res * sf_y);
    sf_s = sf_n - (cellhd.ns_res * sf_rl);
    sf_w = cellhd.west + (cellhd.ew_res * sf_x);
    sf_e = sf_w + (cellhd.ew_res * sf_cl);

    /* parse configuration file */
    token = strtok(NULL, " ");

    if (strcmp("SAMPLEAREA", token) == 0) {
	double rel_sa_x, rel_sa_y, rel_sa_rl, rel_sa_cl;
	int aid = 1, toReturn;

	do {
	    rel_sa_x = atof(strtok(NULL, "|"));
	    rel_sa_y = atof(strtok(NULL, "|"));
	    rel_sa_rl = atof(strtok(NULL, "|"));
	    rel_sa_cl = atof(strtok(NULL, "\n"));

	    if (rel_sa_x == -1.0 && rel_sa_y == -1.0) {
		/* runtime disposition */

		int sa_rl, sa_cl;

		sa_rl = (int)rint(cellhd.rows * rel_sa_rl);
		sa_cl = (int)rint(cellhd.cols * rel_sa_cl);
		g->rows = sf_rl;
		g->cols = sf_cl;
		g->rl = sa_rl;
		g->cl = sa_cl;
		g->count = 1;
		g->sf_x = sf_x;
		g->sf_y = sf_y;
		g->x = sf_x;
		g->y = sf_y;
		g->maskname = NULL;

		return disposeAreas(l, g, strtok(NULL, "\n"));
	    }
	    else {
		msg m;

		toReturn = NORMAL;
		/*read file and create list */
		m.type = AREA;
		m.f.f_a.x = (int)rint(cellhd.cols * rel_sa_x);
		m.f.f_a.y = (int)rint(cellhd.rows * rel_sa_y);
		m.f.f_a.rl = (int)rint(cellhd.rows * rel_sa_rl);
		m.f.f_a.cl = (int)rint(cellhd.cols * rel_sa_cl);
		m.f.f_a.aid = aid;
		aid++;
		insertNode(l, m);
	    }

	} while ((token = strtok(NULL, " ")) != NULL &&
		 strcmp(token, "SAMPLEAREA") == 0);

	close(setup);

	return toReturn;
    }
    else if (strcmp("MASKEDSAMPLEAREA", token) == 0) {
	double rel_sa_x, rel_sa_y, rel_sa_rl, rel_sa_cl;
	int aid = 1;
	char maskname[GNAME_MAX];

	do {
	    rel_sa_x = atof(strtok(NULL, "|"));
	    rel_sa_y = atof(strtok(NULL, "|"));
	    rel_sa_rl = atof(strtok(NULL, "|"));
	    rel_sa_cl = atof(strtok(NULL, "|"));
	    strcpy(maskname, strtok(NULL, "\n"));

	    if (rel_sa_x == -1 && rel_sa_y == -1) {
		/* runtime disposition */
		int sa_rl, sa_cl;

		sa_rl = (int)rint(cellhd.rows * rel_sa_rl);
		sa_cl = (int)rint(cellhd.cols * rel_sa_cl);
		g->rows = sf_rl;
		g->cols = sf_cl;
		g->rl = sa_rl;
		g->cl = sa_cl;
		g->count = 1;
		g->x = sf_x;
		g->y = sf_y;
		g->maskname = maskname;
		return disposeAreas(l, g, strtok(NULL, "\n"));
	    }
	    else {
		/*read file and create list */
		msg m;

		m.type = MASKEDAREA;
		m.f.f_ma.x = (int)rint(cellhd.cols * rel_sa_x);
		m.f.f_ma.y = (int)rint(cellhd.rows * rel_sa_y);
		m.f.f_ma.rl = (int)rint(cellhd.rows * rel_sa_rl);
		m.f.f_ma.cl = (int)rint(cellhd.cols * rel_sa_cl);
		m.f.f_ma.aid = aid;
		strcpy(m.f.f_ma.mask, maskname);
		aid++;
		insertNode(l, m);
	    }
	}
	while ((token = strtok(NULL, " ")) != NULL &&
	       strcmp(token, "MASKEDSAMPLEAREA") == 0);
	close(setup);
	return NORMAL;
    }
    else if (strcmp("MASKEDOVERLAYAREA", token) == 0) {
	double sa_n, sa_s, sa_w, sa_e;
	int aid = 1;
	char maskname[GNAME_MAX];
	msg m;

	do {
	    strcpy(maskname, strtok(NULL, "|"));
	    sa_n = atof(strtok(NULL, "|"));
	    sa_s = atof(strtok(NULL, "|"));
	    sa_e = atof(strtok(NULL, "|"));
	    sa_w = atof(strtok(NULL, "\n"));

	    m.type = MASKEDAREA;
	    m.f.f_ma.x = (int)rint((cellhd.north - sa_n) * cellhd.ns_res);
	    m.f.f_ma.y = (int)rint((cellhd.west + sa_w) * cellhd.ew_res);
	    m.f.f_ma.rl = (int)rint((sa_n - sa_s) * cellhd.ns_res);
	    m.f.f_ma.cl = (int)rint((sa_e - sa_w) * cellhd.ew_res);
	    m.f.f_ma.aid = aid;
	    strcpy(m.f.f_ma.mask, maskname);
	    aid++;
	    insertNode(l, m);
	}
	while ((token = strtok(NULL, " ")) != NULL &&
	       (strcmp(token, "MASKEDOVERLAYAREA") == 0));
	if (strcmp(token, "RASTERMAP") != 0)
	    G_fatal_error(_("Irregular maskedoverlay areas definition"));
	token = strtok(NULL, "\n");
	if (strcmp(token, raster) != 0)
	    G_fatal_error(_("The configuration file can be used only with \
			%s rasterfile"), token);
	close(setup);
	return NORMAL;

    }
    else
	G_fatal_error(_("Illegal configuration file (sample area)"));
    close(setup);
    return ERROR;
}

int disposeAreas(struct list *l, struct g_area *g, char *def)
{
    char *token;

    token = strtok(def, " \n");
    if (strcmp(token, "MOVINGWINDOW") == 0) {
	g->count = 0;
	g->dist = 0;
	g->add_row = 1;
	g->add_col = 1;
	if (g->rl != 1)
	    g->rows = g->rows - g->rl + 1;
	else
	    g->rows = g->rows;
	if (g->cl != 1)
	    g->cols = g->cols - g->cl + 1;
	return MVWIN;
    }
    else if (strcmp(token, "RANDOMNONOVERLAPPING") == 0) {
	int units, sf_rl, sf_cl, sa_rl, sa_cl, max_units, i;
	int *assigned;

	sscanf(strtok(NULL, "\n"), "%i", &units);
	sf_rl = g->rows;
	sf_cl = g->cols;
	sa_rl = g->rl;
	sa_cl = g->cl;
	max_units = (int)rint((sf_rl / sa_rl) * (sf_cl / sa_cl));
	if (units > max_units)
	    G_fatal_error(_("Too many units to place"));
	assigned = G_malloc(units * sizeof(int));
	i = 0;
	srandom(0);
	while (i < units) {
	    int j, position, found = FALSE;

	    position = random() % max_units;
	    for (j = 0; j < i; j++) {
		if (assigned[j] == position)
		    found = TRUE;
	    }
	    if (!found) {
		msg m;

		assigned[i] = position;
		i++;
		if (g->maskname == NULL) {
		    int n_col = rint(sf_cl / sa_cl);

		    m.type = AREA;
		    m.f.f_a.aid = i;
		    m.f.f_a.x = g->sf_x + (position % n_col) * sa_cl;
		    m.f.f_a.y = g->sf_y + (position / n_col) * sa_rl;
		    m.f.f_a.rl = sa_rl;
		    m.f.f_a.cl = sa_cl;
		    insertNode(l, m);
		}
		else {
		    int n_col = sf_cl / sa_cl;

		    m.type = MASKEDAREA;
		    m.f.f_ma.aid = i;
		    m.f.f_a.x = g->sf_x + (position % n_col) * sa_cl;
		    m.f.f_a.y = g->sf_y + (position / n_col) * sa_rl;
		    m.f.f_ma.rl = sa_rl;
		    m.f.f_ma.cl = sa_cl;
		    strcpy(m.f.f_ma.mask, g->maskname);
		    insertNode(l, m);
		}
	    }
	}
	return NORMAL;
    }
    else if (strcmp(token, "SYSTEMATICCONTIGUOUS") == 0) {
	g->dist = 0;
	g->add_row = g->rl;
	g->add_col = g->cl;
	return GEN;
    }
    else if (strcmp(token, "SYSTEMATICNONCONTIGUOUS") == 0) {
	int dist;

	dist = atoi(strtok(NULL, "\n"));
	g->dist = dist;
	g->add_row = g->rl + dist;
	g->add_col = g->cl + dist;
	g->x = g->sf_x + dist;
	g->y = g->sf_y + dist;
	return GEN;
    }
    else if (strcmp(token, "STRATIFIEDRANDOM") == 0) {
	int r_strat, c_strat, r_strat_len, c_strat_len, loop, i;

	r_strat = atoi(strtok(NULL, "|"));
	c_strat = atoi(strtok(NULL, "\n"));
	r_strat_len = (int)rint(g->rows / r_strat);
	c_strat_len = (int)rint(g->cols / c_strat);
	if (r_strat_len < g->rl || c_strat_len < g->cl)
	    G_fatal_error(_("Too many strats for raster map"));
	loop = r_strat * c_strat;
	srandom(0);
	for (i = 0; i < loop; i++) {
	    msg m;

	    if (g->maskname == NULL) {
		m.type = AREA;
		m.f.f_a.aid = i;
		m.f.f_a.x = (int)g->sf_x + ((i % c_strat) * c_strat_len) +
		    (random() % (c_strat_len - g->cl));
		m.f.f_a.y = (int)g->sf_y + (rint(i / c_strat) * r_strat_len) +
		    (random() % (r_strat_len - g->rl));
		m.f.f_a.rl = g->rl;
		m.f.f_a.cl = g->cl;
		insertNode(l, m);
	    }
	    else {
		m.type = MASKEDAREA;
		m.f.f_ma.aid = i;
		m.f.f_ma.x = (int)g->sf_x + ((i % c_strat) * c_strat_len) +
		    (random() % (c_strat_len - g->cl));
		m.f.f_ma.y =
		    (int)g->sf_y + (rint(i / c_strat) * r_strat_len) +
		    (random() % (r_strat_len - g->rl));
		m.f.f_ma.rl = g->rl;
		m.f.f_ma.cl = g->cl;
		strcpy(m.f.f_ma.mask, g->maskname);
		insertNode(l, m);
	    }
	}
	return NORMAL;
    }
    else {
	G_fatal_error(_("Illegal areas disposition"));
	return NORMAL;
    }
    return ERROR;
}


int next_Area(int parsed, struct list *l, struct g_area *g, msg * m)
{
    if (parsed == NORMAL) {
	if (l->size == 0)
	    return 0;
	else {
	    msg tmp;

	    memcpy(&tmp, l->head->m, sizeof(msg));
	    *m = tmp;
	    removeNode(l);
	    return 1;
	}
    }
    else {
	return next(g, m);
    }
}


int print_Output(int out, msg m)
{
    if (m.type != DONE)
	return 0;
    else {
	char s[100];
	int len;

	sprintf(s, "RESULT %i|%f\n", m.f.f_d.aid, m.f.f_d.res);
	len = strlen(s);

	if (write(out, s, len) == len)
	    return 1;
	else
	    return 0;
    }
}


int error_Output(int out, msg m)
{
    if (m.type != ERROR)
	return 0;
    else {
	char s[100];

	sprintf(s, "ERROR %i", m.f.f_d.aid);

	if (write(out, s, strlen(s)) == strlen(s))
	    return 1;
	else
	    return 0;
    }
}


int raster_Output(int fd, int aid, struct g_area *g, double res)
{
    double toPut = res;
    off_t offset = (off_t) aid * sizeof(double);

    if (lseek(fd, offset, SEEK_SET) != offset) {
	G_message(_("Cannot make lseek"));
	return -1;
    }

    if (write(fd, &toPut, sizeof(double)) == 0)
	return 1;
    else
	return 0;
}


int write_raster(int mv_fd, int random_access, struct g_area *g)
{
    int i = 0, j = 0, letti = 0;
    double *file_buf;
    DCELL *cell_buf;
    int cols, rows, center;

    cols = g->cols;
    rows = g->rows;
    center = g->sf_x + ((int)g->cl / 2);

    file_buf = G_malloc(cols * sizeof(double));
    lseek(random_access, 0, SEEK_SET);

    cell_buf = Rast_allocate_d_buf();
    Rast_set_d_null_value(cell_buf, Rast_window_cols() + 1);

    for (i = 0; i < g->sf_y + ((int)g->rl / 2); i++) {
	Rast_put_row(mv_fd, cell_buf, DCELL_TYPE);
    }

    for (i = 0; i < rows; i++) {
	letti = read(random_access, file_buf, (cols * sizeof(double)));

	if (letti == -1)
	    G_message("%s", strerror(errno));

	for (j = 0; j < cols; j++) {
	    cell_buf[j + center] = file_buf[j];
	}

	Rast_put_row(mv_fd, cell_buf, DCELL_TYPE);

    }

    Rast_set_d_null_value(cell_buf, Rast_window_cols() + 1);

    for (i = 0; i < Rast_window_rows() - g->sf_y - g->rows; i++)
	Rast_put_row(mv_fd, cell_buf, DCELL_TYPE);

    return 1;
}