/*
Copyright (C) 2005-2008 Axel Liljencrantz

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2 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 fish_indent.cpp
	The fish_indent proegram.
*/

#include "config.h"

#include <stdlib.h>
#include <stdio.h>
#include <wchar.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#ifdef HAVE_GETOPT_H
#include <getopt.h>
#endif
#include <locale.h>

#include "fallback.h"
#include "util.h"
#include "common.h"
#include "wutil.h"
#include "tokenizer.h"
#include "print_help.h"
#include "parser_keywords.h"

/**
   The string describing the single-character options accepted by the main fish binary
*/
#define GETOPT_STRING "hvi"

/**
   Read the entire contents of a file into the specified string
 */
static void read_file( FILE *f, wcstring &b )
{
	while( 1 )
	{
		errno=0;
		wint_t c = fgetwc( f );
		if( c == WEOF )
		{
			if( errno )
			{
				wperror(L"fgetwc");
				exit(1);
			}
			
			break;
		}
		b.push_back((wchar_t)c);
	}
}

/**
   Insert the specified number of tabs into the output buffer
 */
static void insert_tabs( wcstring &out, int indent )
{
    if (indent > 0)
        out.append((size_t)indent, L'\t');
	
}

/**
   Indent the specified input
 */
static int indent( wcstring &out, const wcstring &in, int flags )
{
	tokenizer tok;
	int res=0;
	int is_command = 1;
	int indent = 0;
	int do_indent = 1;
	int prev_type = 0;
	int prev_prev_type = 0;

	tok_init( &tok, in.c_str(), TOK_SHOW_COMMENTS );
	
	for( ; tok_has_next( &tok ); tok_next( &tok ) )
	{
		int type = tok_last_type( &tok );
		wchar_t *last = tok_last( &tok );
		
		switch( type )
		{
			case TOK_STRING:
			{
				if( is_command )
				{
					int next_indent = indent;
					is_command = 0;
                    
                    wcstring unesc = last;
                    unescape_string(unesc, UNESCAPE_SPECIAL);
					
					if( parser_keywords_is_block(unesc))
					{
						next_indent++;
					}
					else if (unesc == L"else")
					{
						indent--;
					}
					/* case should have the same indent level as switch*/
					else if (unesc == L"case")
					{
						indent--;
					}
					else if (unesc == L"end")
					{
						indent--;
						next_indent--;
					}
					
	
					if( do_indent && flags && prev_type != TOK_PIPE )
					{
						insert_tabs( out, indent );
					}
					
                    append_format(out, L"%ls", last );
					
					indent = next_indent;
					
				}
				else
				{
					if ( prev_type != TOK_REDIRECT_FD )
						out.append( L" " );
					out.append( last );
				}
				
				break;
			}
			
			case TOK_END:
			{
				if( prev_type != TOK_END || prev_prev_type != TOK_END ) 
					out.append( L"\n" );
				do_indent = 1;
				is_command = 1;
				break;
			}

			case TOK_PIPE:
			{
				out.append( L" " );
				if ( last[0] == '2' && !last[1] ) {
					out.append( L"^" );
				} else if ( last[0] != '1' || last[1] ) {
					out.append( last);
                    out.append( L">" );
				}
				out.append( L" | " );
				is_command = 1;
				break;
			}
			
			case TOK_REDIRECT_OUT:
			{
				out.append( L" " );
				if ( wcscmp( last, L"2" ) == 0 ) {
					out.append( L"^" );
				} else {
					if ( wcscmp( last, L"1" ) != 0 )
				out.append( last );
						out.append( L"> " );
				}
						break;
			}
						
					case TOK_REDIRECT_APPEND:
			{
				out.append( L" " );
				if ( wcscmp( last, L"2" ) == 0 ) {
					out.append( L"^^" );
				} else {
					if ( wcscmp( last, L"1" ) != 0 )
						out.append( last );
						out.append( L">> " );
				}
						break;
			}
						
					case TOK_REDIRECT_IN:
			{
				out.append( L" " );
				if ( wcscmp( last, L"0" ) != 0 )
					out.append( last );
						out.append( L"< " );
						break;
			}
						
					case TOK_REDIRECT_FD:
			{
				out.append( L" " );
				if ( wcscmp( last, L"1" ) != 0 )
					out.append( last );
						out.append( L">& " );
						break;
				}

			case TOK_BACKGROUND:
			{
				out.append( L"&\n" );
				do_indent = 1;
				is_command = 1;
				break;
			}
			
			case TOK_COMMENT:
			{
				if( do_indent && flags)
				{
					insert_tabs( out, indent );
				}
				
				append_format( out, L"%ls", last );
				do_indent = 1;
				break;				
			}
			
			default:
			{
				debug( 0, L"Unknown token '%ls'", last );
				exit(1);
			}			
		}
		
		prev_prev_type = prev_type;
		prev_type = type;
		
	}
	
	tok_destroy( &tok );

	return res;
}

/**
   Remove any prefix and suffix newlines from the specified
   string.
 */
static void trim( wcstring &str )
{
    if (str.empty())
        return;

    size_t pos = str.find_first_not_of(L" \n");
    if (pos > 0)
        str.erase(0, pos);
    
    pos = str.find_last_not_of(L" \n");
    if (pos != wcstring::npos && pos + 1 < str.length())
        str.erase(pos + 1);
}


/**
   The main mathod. Run the program.
 */
int main( int argc, char **argv )
{	
	int do_indent=1;
	set_main_thread();
    setup_fork_guards();
    
	wsetlocale( LC_ALL, L"" );
	program_name=L"fish_indent";

	while( 1 )
	{
		static struct option
			long_options[] =
			{
				{
					"no-indent", no_argument, 0, 'i' 
				}
				,
				{
					"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 'h':
			{
				print_help( "fish_indent", 1 );
				exit( 0 );				
				break;
			}
			
			case 'v':
			{
				fwprintf( stderr, 
						  _(L"%ls, version %s\n"), 
						  program_name,
						  PACKAGE_VERSION );
				exit( 0 );				
			}

			case 'i':
			{
				do_indent = 0;
				break;
			}
			
			
			case '?':
			{
				exit( 1 );
			}
			
		}		
	}

    wcstring sb_in, sb_out;
	read_file( stdin, sb_in );
	
	wutil_init();

	if( !indent( sb_out, sb_in, do_indent ) )
	{
        trim(sb_out);
		fwprintf( stdout, L"%ls", sb_out.c_str() );
	}
	else
	{
		/*
		  Indenting failed - print original input
		*/
		fwprintf( stdout, L"%ls", sb_in.c_str() );
	}
	

	wutil_destroy();

	return 0;
}