/*
Copyright (C) 2005 Axel Liljencrantz

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.

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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/


/** \file main.c
	The main loop of <tt>fish</tt>.
*/

#include "config.h"


#include <stdlib.h>
#include <stdio.h>
#include <wchar.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <unistd.h>
#include <termios.h>
#include <fcntl.h>

#ifdef HAVE_GETOPT_H
#include <getopt.h>
#endif

#include <locale.h>
#include <signal.h>

#include "fallback.h"
#include "util.h"

#include "common.h"
#include "reader.h"
#include "builtin.h"
#include "function.h"
#include "complete.h"
#include "wutil.h"
#include "env.h"
#include "sanity.h"
#include "proc.h"
#include "parser.h"
#include "expand.h"
#include "intern.h"
#include "exec.h"
#include "event.h"
#include "output.h"

#include "halloc_util.h"
#include "history.h"

/**
   The string describing the single-character options accepted by the main fish binary
*/
#define GETOPT_STRING "hilnvc:p:d:"

/**
   Parse init files
*/
static int read_init()
{
	char cwd[4096];
	wchar_t *wcwd;

	if( !getcwd( cwd, 4096 ) )
	{
		wperror( L"getcwd" );		
		return 0;
	}

	eval( L"builtin cd " DATADIR L"/fish 2>/dev/null; and builtin . fish 2>/dev/null", 0, TOP );
	eval( L"builtin cd " SYSCONFDIR L" 2>/dev/null; and builtin . fish 2>/dev/null", 0, TOP );
	eval( L"builtin cd 2>/dev/null; and builtin . .fish 2>/dev/null", 0, TOP );

	if( chdir( cwd ) == -1 )
	{
		/*
		  If we can't change back to previos directory, we'll stay in
		  ~. Should be a sane default behavior.
		*/
	}	
	wcwd = str2wcs( cwd );
	if( wcwd )
	{
		env_set( L"PWD", wcwd, ENV_EXPORT );
		free( wcwd );
	}

	return 1;
}

/**
   Calls a bunch of init functions, parses the init files and then
   parses commands from stdin or files, depending on arguments
*/

int main( int argc, char **argv )
{
	int res=1;
	int force_interactive=0;
	int my_optind;
	
	char *cmd=0;	

	halloc_util_init();	

	wsetlocale( LC_ALL, L"" );
	is_interactive_session=1;
	program_name=L"fish";
	
	while( 1 )
	{
		static struct option
			long_options[] =
			{
				{
					"command", required_argument, 0, 'c' 
				}
				,
				{
					"debug-level", required_argument, 0, 'd' 
				}
				,
				{
					"interactive", no_argument, 0, 'i' 
				}
				,
				{
					"login", no_argument, 0, 'l' 
				}
				,
				{
					"no-execute", no_argument, 0, 'n' 
				}
				,
				{
					"profile", required_argument, 0, 'p' 
				}
				,
				{
					"help", no_argument, 0, 'h' 
				}
				,
				{
					"version", no_argument, 0, 'v' 
				}
				,
				{ 
					0, 0, 0, 0 
				}
			}
		;
		
		int opt_index = 0;
		
		int opt = getopt_long( argc,
							   argv, 
							   GETOPT_STRING,
							   long_options, 
							   &opt_index );
		
		if( opt == -1 )
			break;
		
		switch( opt )
		{
			case 0:
			{
				break;
			}
			
			case 'c':		
			{
				cmd = optarg;				
				is_interactive_session = 0;
				break;
			}
			
			case 'd':		
			{
				char *end;
				int tmp = strtol(optarg, &end, 10);
				if( tmp >= 0 && tmp <=10 && !*end )
				{
					debug_level=tmp;
				}
				else
				{
					debug( 0, _(L"Invalid value '%s' for debug level switch"), optarg );
					exit(1);
				}
				break;
			}
			
			case 'h':
			{
				cmd = "help";
				break;
			}
			
			case 'i':
			{
				force_interactive = 1;
				break;				
			}
			
			case 'l':
			{
				is_login=1;
				break;				
			}
			
			case 'n':
			{
				no_exec=1;
				break;				
			}
			
			case 'p':
			{
				profile = optarg;
				break;				
			}
			
			case 'v':
			{
				fwprintf( stderr, 
						  _(L"%s, version %s\n"), 
						  PACKAGE_NAME,
						  PACKAGE_VERSION );
				exit( 0 );				
			}
			
			case '?':
			{
				return 1;
			}
			
		}		
	}

	my_optind = optind;
	
	is_login |= (strcmp( argv[0], "-fish") == 0);
		
	is_interactive_session &= (cmd == 0);
	is_interactive_session &= (my_optind == argc);
	is_interactive_session &= isatty(STDIN_FILENO);	
	is_interactive_session |= force_interactive;

	/*
	  No-exec is prohibited when in interactive mode
	*/
	if( is_interactive_session && no_exec)
	{
		debug( 1, _(L"Can not use the no-execute mode when running an interactive session") );
		no_exec = 0;
	}
	

	proc_init();	
	event_init();	
	wutil_init();
	parser_init();
	builtin_init();
	function_init();
	env_init();
	reader_init();
	history_init();

	if( read_init() )
	{
		if( cmd != 0 )
		{
			wchar_t *cmd_wcs = str2wcs( cmd );
			res = eval( cmd_wcs, 0, TOP );
			free(cmd_wcs);
			reader_exit(0, 0);
		}
		else
		{
			if( my_optind == argc )
			{
				res = reader_read( 0 );				
			}
			else
			{
				char **ptr; 
				char *file = *(argv+1);
				int i; 
				string_buffer_t sb;
				int fd;
				wchar_t *rel_filename, *abs_filename;
								
				if( ( fd = open(file, O_RDONLY) ) == -1 )
				{
					wperror( L"open" );
					return 1;
				}

				if( *(argv+2))
				{
					sb_init( &sb );
				
					for( i=1,ptr = argv+2; *ptr; i++, ptr++ )
					{
						if( i != 1 )
							sb_append( &sb, ARRAY_SEP_STR );
						wchar_t *val = str2wcs( *ptr );
						sb_append( &sb, val );
						free( val );
					}
				
					env_set( L"argv", (wchar_t *)sb.buff, 0 );
					sb_destroy( &sb );
				}

				rel_filename = str2wcs( file );
				abs_filename = wrealpath( rel_filename, 0 );
				if( !abs_filename )
					abs_filename = wcsdup(rel_filename);
				reader_push_current_filename( intern( abs_filename ) );
				free( rel_filename );
				free( abs_filename );

				res = reader_read( fd );

				if( res )
				{
					debug( 1, 
						   _(L"Error while reading file %ls\n"), 
						   reader_current_filename()?reader_current_filename(): _(L"Standard input") );
				}				
				reader_pop_current_filename();
			}
		}
	}

	proc_fire_event( L"PROCESS_EXIT", EVENT_EXIT, getpid(), res );
	

	history_destroy();
	proc_destroy();
	builtin_destroy();
	function_destroy();
	reader_destroy();
	parser_destroy();
	wutil_destroy();
	event_destroy();

	halloc_util_destroy();

	env_destroy();

	intern_free_all();


	return res;	
}