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/*
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 *  R : A Computer Language for Statistical Data Analysis
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 *  Copyright (C) 2010--2023  R Core Team
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 *
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 *  This program is free software; you can redistribute it and/or modify
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 *  it under the terms of the GNU General Public License as published by
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 *  the Free Software Foundation; either version 2 of the License, or
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 *  (at your option) any later version.
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 *
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 *  This program is distributed in the hope that it will be useful,
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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *  GNU General Public License for more details.
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 *
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 *  You should have received a copy of the GNU General Public License
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 *  along with this program; if not,  a copy is available at
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 *  https://www.R-project.org/Licenses/
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 */
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#define WIN32_LEAN_AND_MEAN 1
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#include <windows.h> /* for SetConsoleCtrlHandler */
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#include <stdlib.h>  /* for exit */
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#include <string.h>
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#include <stdio.h>
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extern char *getRHOME(int); /* in ../rhome.c */
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extern void freeRHOME(char *);
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extern size_t quoted_arg_len(const char *arg); /* in rcmdfn.c */
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extern char *quoted_arg_cat(char *dest, const char *arg);
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static void Usage (char *RCMD, char *arch)
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{
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    fprintf(stderr, "%s %s %s", "Usage:", RCMD, "[command args]\n\n");
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    fprintf(stderr, "%s%s%s",
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	    "where 'command args' can be\n\n",
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	    "  --arch n   for n=i386, x64, 32 or 64\n",
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	    "  any other arguments listed by ");
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    fprintf(stderr, "%s --arch %s --help\n", RCMD, arch);
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}
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static BOOL WINAPI CtrlHandler(DWORD type)
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{
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    /* ignore Ctrl-C; R handles Ctrl+Break the same way (see psignal) */
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    return (type == CTRL_C_EVENT || type == CTRL_BREAK_EVENT);
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}
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#define CMD_LEN 10000
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int main (int argc, char **argv)
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{
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    int cmdarg = 1;
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    int interactive = 0;
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    char arch[10] = R_ARCH, cmd[CMD_LEN], *p;
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    if (argc > 1 && strcmp(argv[1], "--help") == 0) {
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	Usage(argv[0], arch);
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	exit(0);
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    }
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    if (argc > 1 && strcmp(argv[1], "--arch") == 0) {
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	cmdarg = 3;
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	if(argc < 3) {
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	    Usage(argv[0], arch);
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	    exit(0);
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	}
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	strncpy(arch, argv[2], 10); arch[9] = '\0';
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	if(strcmp(arch, "32") == 0) strcpy(arch, "i386");
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	if(strcmp(arch, "64") == 0) strcpy(arch, "x64");
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	if(strcmp(arch, "i386") && strcmp(arch, "x64")) {
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	    fprintf(stderr, "valid values for --arch are i386, x64, 32, 64\n");
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	    exit(1);
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	}
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    } else if ((p = getenv("R_ARCH"))) {
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	strncpy(arch, p+1, 10 - 1); /* skip leading slash */
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	arch[10 - 1] = '\0';
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    }
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    char *rhome2 = getRHOME(2);
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    if (!rhome2) {
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	fprintf(stderr, "Invalid R_HOME\n");
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	exit(1);
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    }
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    if (stricmp(argv[0] + strlen(argv[0]) - 11, "Rscript.exe") == 0
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	|| stricmp(argv[0] + strlen(argv[0]) - 7, "Rscript") == 0)
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	snprintf(cmd, CMD_LEN, "\"\"%s\\bin\\%s\\Rscript.exe\"", rhome2, arch);
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    else {
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    	snprintf(cmd, CMD_LEN, "\"\"%s\\bin\\%s\\R.exe\"", rhome2, arch);
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	interactive = 1;
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    }
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    freeRHOME(rhome2);
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    for(int i = cmdarg; i < argc; i++) {
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	if (interactive && !strcmp(argv[i], "CMD"))
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	    interactive = 0;
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	if (strlen(cmd) + quoted_arg_len(argv[i]) + 2 > CMD_LEN) {
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	    fprintf(stderr, "command line too long\n");
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	    exit(27);
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	}
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	strcat(cmd, " ");
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	quoted_arg_cat(cmd, argv[i]);
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    }
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    /* the outermost double quotes are needed for cmd.exe */
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    if (strlen(cmd) + 1 > CMD_LEN) {
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	fprintf(stderr, "command line too long\n");
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	exit(27);
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    }
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    strcat(cmd, "\"");
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    if (interactive)
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	/* Ignore Ctrl-C so that Rterm.exe can handle it */
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	/*   don't SetConsoleCtrlHandler(NULL, TRUE) to preserve
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	     the current setting of the inheritable attribute */
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	SetConsoleCtrlHandler(CtrlHandler, TRUE);
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    exit(system(cmd));
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 }