/* File: main.c */

/*
 * Copyright (c) 1997 Ben Harrison, and others
 *
 * This software may be copied and distributed for educational, research,
 * and not for profit purposes provided that this copyright and statement
 * are included in all such copies.
 */

#include "system/angband.h"
#include "system/system-variables.h"
#include "io/uid-checker.h"
#include "io/signal-handlers.h"
#include "io/files-util.h"
#include "io/inet.h"
#include "main/init.h"
#include "core/scores.h"
#include "term/gameterm.h"
#include "player/process-name.h"
#include "io/chuukei.h"
#include "autopick/autopick-pref-processor.h"
#include "system/angband-version.h"
#include "core/game-play.h"

/*
 * Available graphic modes
 */
#define GRAPHICS_NONE       0
#define GRAPHICS_ORIGINAL   1
#define GRAPHICS_ADAM_BOLT  2
#define GRAPHICS_HENGBAND   3

/*
 * Some machines have a "main()" function in their "main-xxx.c" file,
 * all the others use this file for their "main()" function.
 */


#if !defined(WINDOWS)

/*
 * A hook for "quit()".
 *
 * Close down, then fall back into "quit()".
 */
static void quit_hook(concptr s)
{
	int j;

	/* Unused */
	(void)s;

	/* Scan windows */
	for (j = 8 - 1; j >= 0; j--)
	{
		/* Unused */
		if (!angband_term[j]) continue;

		/* Nuke it */
		term_nuke(angband_term[j]);
	}
}


/*
 * Set the stack size and overlay buffer (see main-286.c")
 */
#ifdef PRIVATE_USER_PATH

/*
 * Create an ".angband/" directory in the users home directory.
 *
 * ToDo: Add error handling.
 * ToDo: Only create the directories when actually writing files.
 */
static void create_user_dir(void)
{
	char dirpath[1024];
	char subdirpath[1024];

	/* Get an absolute path from the filename */
	path_parse(dirpath, 1024, PRIVATE_USER_PATH);

	/* Create the ~/.angband/ directory */
	mkdir(dirpath, 0700);

	/* Build the path to the variant-specific sub-directory */
	path_build(subdirpath, sizeof(subdirpath), dirpath, VERSION_NAME);

	/* Create the directory */
	mkdir(subdirpath, 0700);
}

#endif /* PRIVATE_USER_PATH */


/*
 * Initialize and verify the file paths, and the score file.
 *
 * Use the ANGBAND_PATH environment var if possible, else use
 * DEFAULT_PATH, and in either case, branch off appropriately.
 *
 * First, we'll look for the ANGBAND_PATH environment variable,
 * and then look for the files in there.  If that doesn't work,
 * we'll try the DEFAULT_PATH constant.  So be sure that one of
 * these two things works...
 *
 * We must ensure that the path ends with "PATH_SEP" if needed,
 * since the "init_file_paths()" function will simply append the
 * relevant "sub-directory names" to the given path.
 *
 * Make sure that the path doesn't overflow the buffer.  We have
 * to leave enough space for the path separator, directory, and
 * filenames.
 */
static void init_stuff(void)
{
	char path[1024];

	concptr tail;

	/* Get the environment variable */
	tail = getenv("ANGBAND_PATH");

	/* Use the angband_path, or a default */
	strncpy(path, tail ? tail : DEFAULT_PATH, 511);

	/* Make sure it's terminated */
	path[511] = '\0';

	/* Hack -- Add a path separator (only if needed) */
	if (!suffix(path, PATH_SEP)) strcat(path, PATH_SEP);

	/* Initialize */
	init_file_paths(path);
}



/*
 * Handle a "-d<what>=<path>" option
 *
 * The "<what>" can be any string starting with the same letter as the
 * name of a subdirectory of the "lib" folder (i.e. "i" or "info").
 *
 * The "<path>" can be any legal path for the given system, and should
 * not end in any special path separator (i.e. "/tmp" or "~/.ang-info").
 */
static void change_path(concptr info)
{
	concptr s;

	/* Find equal sign */
	s = my_strchr(info, '=');

	/* Verify equal sign */
	if (!s) quit_fmt("Try '-d<what>=<path>' not '-d%s'", info);

	/* Analyze */
	switch (tolower(info[0]))
	{
		case 'a':
		{
			string_free(ANGBAND_DIR_APEX);
			ANGBAND_DIR_APEX = string_make(s+1);
			break;
		}

		case 'f':
		{
			string_free(ANGBAND_DIR_FILE);
			ANGBAND_DIR_FILE = string_make(s+1);
			break;
		}

		case 'h':
		{
			string_free(ANGBAND_DIR_HELP);
			ANGBAND_DIR_HELP = string_make(s+1);
			break;
		}

		case 'i':
		{
			string_free(ANGBAND_DIR_INFO);
			ANGBAND_DIR_INFO = string_make(s+1);
			break;
		}

		case 'u':
		{
			string_free(ANGBAND_DIR_USER);
			ANGBAND_DIR_USER = string_make(s+1);
			break;
		}

		case 'x':
		{
			string_free(ANGBAND_DIR_XTRA);
			ANGBAND_DIR_XTRA = string_make(s+1);
			break;
		}

		case 'b':
		{
			string_free(ANGBAND_DIR_BONE);
			ANGBAND_DIR_BONE = string_make(s+1);
			break;
		}

		case 'd':
		{
			string_free(ANGBAND_DIR_DATA);
			ANGBAND_DIR_DATA = string_make(s+1);
			break;
		}

		case 'e':
		{
			string_free(ANGBAND_DIR_EDIT);
			ANGBAND_DIR_EDIT = string_make(s+1);
			break;
		}

		case 's':
		{
			string_free(ANGBAND_DIR_SAVE);
			ANGBAND_DIR_SAVE = string_make(s+1);
			break;
		}

		case 'z':
		{
			string_free(ANGBAND_DIR_SCRIPT);
			ANGBAND_DIR_SCRIPT = string_make(s+1);
			break;
		}

		default:
		{
			quit_fmt("Bad semantics in '-d%s'", info);
		}
	}
}

static void display_usage(void)
{
	/* Dump usage information */
	puts("Usage: angband [options] [-- subopts]");
	puts("  -n       Start a new character");
	puts("  -f       Request fiddle mode");
	puts("  -w       Request wizard mode");
	puts("  -b       Request BGM mode");
	puts("  -v       Request sound mode");
	puts("  -g       Request graphics mode");
	puts("  -o       Request original keyset");
	puts("  -r       Request rogue-like keyset");
	puts("  -M       Request monochrome mode");
	puts("  -s<num>  Show <num> high scores");
	puts("  -u<who>  Use your <who> savefile");
	puts("  -m<sys>  Force 'main-<sys>.c' usage");
	puts("  -d<def>  Define a 'lib' dir sub-path");
	puts("");

#ifdef USE_X11
	puts("  -mx11    To use X11");
	puts("  --       Sub options");
	puts("  -- -d    Set display name");
	puts("  -- -o    Request old 8x8 tile graphics");
	puts("  -- -a    Request Adam Bolt 16x16 tile graphics");
	puts("  -- -b    Request Bigtile graphics mode");
	puts("  -- -s    Turn off smoothscaling graphics");
	puts("  -- -n#   Number of terms to use");
	puts("");
#endif /* USE_X11 */

#ifdef USE_GCU
	puts("  -mgcu    To use GCU (GNU Curses)");
#endif /* USE_GCU */

#ifdef USE_CAP
	puts("  -mcap    To use CAP (\"Termcap\" calls)");
#endif /* USE_CAP */

	/* Actually abort the process */
	quit(NULL);
}


/*
 * Simple "main" function for multiple platforms.
 *
 * Note the special "--" option which terminates the processing of
 * standard options.  All non-standard options (if any) are passed
 * directly to the "init_xxx()" function.
 */
int main(int argc, char *argv[])
{
	int i;

	bool done = FALSE;
	bool new_game = FALSE;
	int show_score = 0;
	concptr mstr = NULL;
	bool args = TRUE;

	/* Save the "program name" XXX XXX XXX */
	argv0 = argv[0];

#ifdef SET_UID

	/* Default permissions on files */
	(void)umask(022);

#endif


	/* Get the file paths */
	init_stuff();


#ifdef SET_UID

	/* Get the user id (?) */
	p_ptr->player_uid = getuid();

#ifdef VMS
	/* Mega-Hack -- Factor group id */
	p_ptr->player_uid += (getgid() * 1000);
#endif

# ifdef SAFE_SETUID

#  ifdef _POSIX_SAVED_IDS

	/* Save some info for later */
	p_ptr->player_euid = geteuid();
	p_ptr->player_egid = getegid();

#  endif

# endif

#endif


	/* Drop permissions */
	safe_setuid_drop();


#ifdef SET_UID

	/* Acquire the "user name" as a default player name */
	user_name(p_ptr->name, p_ptr->player_uid);

#ifdef PRIVATE_USER_PATH

	/* Create a directory for the users files. */
	create_user_dir();

#endif /* PRIVATE_USER_PATH */

#endif /* SET_UID */


	/* Process the command line arguments */
	for (i = 1; args && (i < argc); i++)
	{
		/* Require proper options */
		if (argv[i][0] != '-')
		{
			display_usage();
			continue;
		}

		/* Analyze option */
		bool is_usage_needed = FALSE;
		switch (argv[i][1])
		{
			case 'N':
			case 'n':
			{
				new_game = TRUE;
				break;
			}
			case 'F':
			case 'f':
			{
				arg_fiddle = TRUE;
				break;
			}
			case 'W':
			case 'w':
			{
				arg_wizard = TRUE;
				break;
			}
			case 'B':
			case 'b':
			{
				arg_music = TRUE;
				break;
			}
			case 'V':
			case 'v':
			{
				arg_sound = TRUE;
				break;
			}
			case 'G':
			case 'g':
			{
				/* HACK - Graphics mode switches on the original tiles */
				arg_graphics = GRAPHICS_ORIGINAL;
				break;
			}
			case 'R':
			case 'r':
			{
				arg_force_roguelike = TRUE;
				break;
			}
			case 'O':
			case 'o':
			{
				arg_force_original = TRUE;
				break;
			}
			case 'S':
			case 's':
			{
				show_score = atoi(&argv[i][2]);
				if (show_score <= 0) show_score = 10;
				break;
			}
			case 'u':
			case 'U':
			{
				if (!argv[i][2])
				{
					is_usage_needed = TRUE;
					break;
				}

				strcpy(p_ptr->name, &argv[i][2]);
				break;
			}
			case 'm':
			{
				if (!argv[i][2])
				{
					is_usage_needed = TRUE;
					break;
				}

				mstr = &argv[i][2];
				break;
			}
			case 'M':
			{
				arg_monochrome = TRUE;
				break;
			}
			case 'd':
			case 'D':
			{
				change_path(&argv[i][2]);
				break;
			}
#ifdef CHUUKEI
			case 'p':
			case 'P':
			{
				if (!argv[i][2])
				{
					is_usage_needed = TRUE;
					break;
				}

				chuukei_server = TRUE;
				if (connect_chuukei_server(&argv[i][2]) < 0) chuukei_server = FALSE;
				break;
			}

			case 'c':
			case 'C':
			{
				if (!argv[i][2])
				{
					is_usage_needed = TRUE;
					break;
				}

				chuukei_client = TRUE;
				connect_chuukei_server(&argv[i][2]);
				break;
			}
#endif
			case 'x':
			{
				if (!argv[i][2])
				{
					is_usage_needed = TRUE;
					break;
				}

				prepare_browse_movie(&argv[i][2]);
				break;
			}
			case '-':
			{
				argv[i] = argv[0];
				argc = argc - i;
				argv = argv + i;
				args = FALSE;
				break;
			}
			default:
			{
				is_usage_needed = TRUE;
				break;
			}
		}

		if (!is_usage_needed) continue;

		display_usage();
	}

	/* Hack -- Forget standard args */
	if (args)
	{
		argc = 1;
		argv[1] = NULL;
	}


	/* Process the player name */
	process_player_name(p_ptr,TRUE);



	/* Install "quit" hook */
	quit_aux = quit_hook;



#ifdef USE_XAW
	/* Attempt to use the "main-xaw.c" support */
	if (!done && (!mstr || (streq(mstr, "xaw"))))
	{
		extern errr init_xaw(int, char**);
		if (0 == init_xaw(argc, argv))
		{
			ANGBAND_SYS = "xaw";
			done = TRUE;
		}
	}
#endif

#ifdef USE_X11
	/* Attempt to use the "main-x11.c" support */
	if (!done && (!mstr || (streq(mstr, "x11"))))
	{
		extern errr init_x11(int, char**);
		if (0 == init_x11(argc, argv))
		{
			ANGBAND_SYS = "x11";
			done = TRUE;
		}
	}
#endif

#ifdef USE_GCU
	/* Attempt to use the "main-gcu.c" support */
	if (!done && (!mstr || (streq(mstr, "gcu"))))
	{
		extern errr init_gcu(int, char**);
		if (0 == init_gcu(argc, argv))
		{
			ANGBAND_SYS = "gcu";
			done = TRUE;
		}
	}
#endif

#ifdef USE_CAP
	/* Attempt to use the "main-cap.c" support */
	if (!done && (!mstr || (streq(mstr, "cap"))))
	{
		extern errr init_cap(int, char**);
		if (0 == init_cap(argc, argv))
		{
			ANGBAND_SYS = "cap";
			done = TRUE;
		}
	}
#endif

	/* Make sure we have a display! */
	if (!done) quit("Unable to prepare any 'display module'!");


	/* Hack -- If requested, display scores and quit */
	if (show_score > 0) display_scores(0, show_score);


	/* Catch nasty signals */
	signals_init();

	/* Initialize */
	init_angband(p_ptr, process_autopick_file_command);

	/* Wait for response */
	pause_line(23);

	/* Play the game */
	play_game(p_ptr, new_game);

	/* Quit */
	quit(NULL);

	/* Exit */
	return (0);
}

#endif
