/** \file builtin_complete.c Functions defining the complete builtin

Functions used for implementing the complete builtin. 

*/
#include "config.h"

#include <stdlib.h>
#include <stdio.h>
#include <wchar.h>
#include <wctype.h>
#include <sys/types.h>
#include <termios.h>
#include <signal.h>

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

#include "wutil.h"
#include "builtin.h"
#include "common.h"
#include "complete.h"
#include "wgetopt.h"
#include "parser.h"
#include "reader.h"


/**
   Internal storage for the builtin_complete_get_temporary_buffer() function.
*/
static const wchar_t *temporary_buffer;

/*
  builtin_complete_* are a set of rather silly looping functions that
  make sure that all the proper combinations of complete_add or
  complete_remove get called. This is needed since complete allows you
  to specify multiple switches on a single commandline, like 'complete
  -s a -s b -s c', but the complete_add function only accepts one
  short switch and one long switch.
*/

/**
   Silly function
*/
static void	builtin_complete_add2( const wchar_t *cmd,
								   int cmd_type,
								   const wchar_t *short_opt,
								   const wcstring_list_t &gnu_opt,
								   const wcstring_list_t &old_opt, 
								   int result_mode, 
								   const wchar_t *condition,
								   const wchar_t *comp,
								   const wchar_t *desc,
								   int flags )
{
	size_t i;
	const wchar_t *s;
	
	for( s=short_opt; *s; s++ )
	{
		complete_add( cmd, 
					  cmd_type,
					  *s,
					  0,
					  0,
					  result_mode,
					  condition,
					  comp,
					  desc,
					  flags );
	}
	
	for( i=0; i<gnu_opt.size(); i++ )
	{
		complete_add( cmd, 
					  cmd_type,
					  0,
					  gnu_opt.at(i).c_str(),
					  0,
					  result_mode,
					  condition,
					  comp,
					  desc,
					  flags );
	}
	
	for( i=0; i<old_opt.size(); i++ )
	{
		complete_add( cmd, 
					  cmd_type,
					  0,
					  old_opt.at(i).c_str(),
					  1,
					  result_mode,
					  condition,
					  comp,
					  desc,
					  flags );
	}	

	if( old_opt.size() == 0 && gnu_opt.size() == 0 && wcslen(short_opt) == 0 )
	{
		complete_add( cmd, 
					  cmd_type,
					  0,
					  0,
					  0,
					  result_mode,
					  condition,
					  comp,
					  desc,
					  flags );
	}	
}

/**
   Silly function
*/
static void	builtin_complete_add( const wcstring_list_t &cmd, 
								  const wcstring_list_t &path,
								  const wchar_t *short_opt,
								  wcstring_list_t &gnu_opt,
								  wcstring_list_t &old_opt, 
								  int result_mode, 
								  int authoritative,
								  const wchar_t *condition,
								  const wchar_t *comp,
								  const wchar_t *desc,
								  int flags )
{
	for( size_t i=0; i<cmd.size(); i++ )
	{
		builtin_complete_add2( cmd.at(i).c_str(),
							   COMMAND,
							   short_opt, 
							   gnu_opt,
							   old_opt, 
							   result_mode, 
							   condition, 
							   comp, 
							   desc,
							   flags );

		if( authoritative != -1 )
		{
			complete_set_authoritative( cmd.at(i).c_str(),
									  COMMAND,
									  authoritative );
		}
		
	}
	
	for( size_t i=0; i<path.size(); i++ )
	{
		builtin_complete_add2( path.at(i).c_str(),
							   PATH,
							   short_opt, 
							   gnu_opt,
							   old_opt, 
							   result_mode, 
							   condition, 
							   comp, 
							   desc,
							   flags );

		if( authoritative != -1 )
		{
			complete_set_authoritative( path.at(i).c_str(),
									  PATH,
									  authoritative );
		}
		
	}	
}

/**
   Silly function
*/
static void builtin_complete_remove3( const wchar_t *cmd,
									  int cmd_type,
									  wchar_t short_opt,
									  const wcstring_list_t &long_opt )
{
	for( size_t i=0; i<long_opt.size(); i++ )
	{
		complete_remove( cmd,
						 cmd_type,
						 short_opt,
						 long_opt.at(i).c_str());
	}	
}

/**
   Silly function
*/
static void	builtin_complete_remove2( const wchar_t *cmd,
									  int cmd_type,
									  const wchar_t *short_opt,
									  const wcstring_list_t &gnu_opt,
									  const wcstring_list_t &old_opt )
{
	const wchar_t *s = (wchar_t *)short_opt;
	if( *s )
	{
		for( ; *s; s++ )
		{
			if( old_opt.size() == 0 && gnu_opt.size() == 0 )
			{
				complete_remove(cmd,
								cmd_type,
								*s,
								0 );
				
			}
			else
			{
				builtin_complete_remove3( cmd,
										  cmd_type,
										  *s,
										  gnu_opt );
				builtin_complete_remove3( cmd,
										  cmd_type,
										  *s,
										  old_opt );
			}
		}
	}
	else
	{
		builtin_complete_remove3( cmd,
								  cmd_type,
								  0,
								  gnu_opt );
		builtin_complete_remove3( cmd,
								  cmd_type,
								  0,
								  old_opt );
										  
	}				

	
}

/**
   Silly function
*/
static void	builtin_complete_remove( const wcstring_list_t &cmd, 
									 const wcstring_list_t &path,
									 const wchar_t *short_opt,
									 const wcstring_list_t &gnu_opt,
									 const wcstring_list_t &old_opt )
{	
	for( size_t i=0; i<cmd.size(); i++ )
	{
		builtin_complete_remove2( cmd.at(i).c_str(),
								  COMMAND,
								  short_opt, 
								  gnu_opt,
								  old_opt );
	}
	
	for( size_t i=0; i<path.size(); i++ )
	{
		builtin_complete_remove2( path.at(i).c_str(),
								  PATH,
								  short_opt, 
								  gnu_opt,
								  old_opt );
	}
	
}


const wchar_t *builtin_complete_get_temporary_buffer()
{
    ASSERT_IS_MAIN_THREAD();
	return temporary_buffer;
}

/**
   The complete builtin. Used for specifying programmable
   tab-completions. Calls the functions in complete.c for any heavy
   lifting. Defined in builtin_complete.c
*/
static int builtin_complete( parser_t &parser, wchar_t **argv )
{
    ASSERT_IS_MAIN_THREAD();
	int res=0;
	int argc=0;
	int result_mode=SHARED;
	int remove = 0;
	int authoritative = -1;
	int flags = COMPLETE_AUTO_SPACE;
	
	wcstring short_opt;
	wcstring_list_t gnu_opt, old_opt;
	const wchar_t *comp=L"", *desc=L"", *condition=L"";

	const wchar_t *do_complete = 0;
	
	wcstring_list_t cmd;
	wcstring_list_t path;

	static int recursion_level=0;
	
	argc = builtin_count_args( argv );	
	
	woptind=0;
	
	while( res == 0 )
	{
		static const struct woption
			long_options[] =
			{
				{
					L"exclusive", no_argument, 0, 'x' 
				}
				,
				{
					L"no-files", no_argument, 0, 'f' 
				}
				,
				{
					L"require-parameter", no_argument, 0, 'r' 
				}
				,
				{
					L"path", required_argument, 0, 'p'
				}
				,					
				{
					L"command", required_argument, 0, 'c' 
				}
				,					
				{
					L"short-option", required_argument, 0, 's' 
				}
				,
				{
					L"long-option", required_argument, 0, 'l'
				}
				,
				{
					L"old-option", required_argument, 0, 'o' 
				}
				,
				{
					L"description", required_argument, 0, 'd'
				}
				,
				{
					L"arguments", required_argument, 0, 'a'
				}
				,
				{
					L"erase", no_argument, 0, 'e'
				}
				,
				{
					L"unauthoritative", no_argument, 0, 'u'
				}
				,
				{
					L"authoritative", no_argument, 0, 'A'
				}
				,
				{
					L"condition", required_argument, 0, 'n'
				}
				,
				{
					L"do-complete", optional_argument, 0, 'C'
				}
				,
				{
					L"help", no_argument, 0, 'h'
				}
				,
				{ 
					0, 0, 0, 0 
				}
			}
		;		
		
		int opt_index = 0;
		
		int opt = wgetopt_long( argc,
								argv, 
								L"a:c:p:s:l:o:d:frxeuAn:C::h", 
								long_options, 
								&opt_index );
		if( opt == -1 )
			break;
			
		switch( opt )
		{
			case 0:
				if(long_options[opt_index].flag != 0)
					break;
                append_format(stderr_buffer,
                           BUILTIN_ERR_UNKNOWN,
                           argv[0],
                           long_options[opt_index].name );
				builtin_print_help( parser, argv[0], stderr_buffer );

				
				res = 1;
				break;
				
			case 'x':					
				result_mode |= EXCLUSIVE;
				break;
					
			case 'f':					
				result_mode |= NO_FILES;
				break;
				
			case 'r':					
				result_mode |= NO_COMMON;
				break;
					
			case 'p':	
			case 'c':
			{
				wchar_t *a = unescape( woptarg, 1);
				if( a )
				{
                    if (opt=='p')
                        path.push_back(a);
                    else
                        cmd.push_back(a);

					free(a);
				}
				else
				{
					append_format(stderr_buffer, L"%ls: Invalid token '%ls'\n", argv[0], woptarg );
					res = 1;					
				}				
				break;
			}
				
			case 'd':
				desc = woptarg;
				break;
				
			case 'u':
				authoritative=0;
				break;
				
			case 'A':
				authoritative=1;
				break;
				
			case 's':
                short_opt.append(woptarg);
				break;
					
			case 'l':
                gnu_opt.push_back(woptarg);
				break;
				
			case 'o':
                old_opt.push_back(woptarg);
				break;

			case 'a':
				comp = woptarg;
				break;
				
			case 'e':
				remove = 1;
				break;

			case 'n':
				condition = woptarg;
				break;
				
			case 'C':
				do_complete = woptarg?woptarg:reader_get_buffer();
				break;
				
			case 'h':
				builtin_print_help( parser, argv[0], stdout_buffer );
				return 0;
				
			case '?':
				builtin_unknown_option( parser, argv[0], argv[woptind-1] );
				res = 1;
				break;
				
		}
		
	}

	if( !res )
	{
		if( condition && wcslen( condition ) )
		{
			if( parser.test( condition, 0, 0, 0 ) )
			{
				append_format(stderr_buffer,
						   L"%ls: Condition '%ls' contained a syntax error\n", 
						   argv[0],
						   condition );
				
				parser.test( condition, 0, &stderr_buffer, argv[0] );
				
				res = 1;
			}
		}
	}
	
	if( !res )
	{
		if( comp && wcslen( comp ) )
		{
			if( parser.test_args( comp, 0, 0 ) )
			{
				append_format(stderr_buffer,
						   L"%ls: Completion '%ls' contained a syntax error\n", 
						   argv[0],
						   comp );
				
				parser.test_args( comp, &stderr_buffer, argv[0] );
				
				res = 1;
			}
		}
	}

	if( !res )
	{
		if( do_complete )
		{
			std::vector<completion_t> comp;

			const wchar_t *prev_temporary_buffer = temporary_buffer;

			const wchar_t *token;

			parse_util_token_extent( do_complete, wcslen( do_complete ), &token, 0, 0, 0 );
						
			temporary_buffer = do_complete;		

			if( recursion_level < 1 )
			{
				recursion_level++;
			
				complete( do_complete, comp );
			
				for( size_t i=0; i< comp.size() ; i++ )
				{
					const completion_t &next =  comp.at( i );

					const wchar_t *prepend;
					
					if( next.flags & COMPLETE_NO_CASE )
					{
						prepend = L"";
					}
					else
					{
						prepend = token;
					}
						

					if( !(next.description).empty() )
					{
						append_format(stdout_buffer, L"%ls%ls\t%ls\n", prepend, next.completion.c_str(), next.description.c_str() );
					}
					else
					{
						append_format(stdout_buffer, L"%ls%ls\n", prepend, next.completion.c_str() );
					}
				}
			
				recursion_level--;
			}
		
			temporary_buffer = prev_temporary_buffer;		
		
		}
		else if( woptind != argc )
		{
			append_format(stderr_buffer, 
					   _( L"%ls: Too many arguments\n" ),
					   argv[0] );
			builtin_print_help( parser, argv[0], stderr_buffer );

			res = 1;
		}
		else if( cmd.empty() && path.empty() )
		{
			/* No arguments specified, meaning we print the definitions of
			 * all specified completions to stdout.*/
			complete_print( stdout_buffer );		
		}
		else
		{
			if( remove )
			{
				builtin_complete_remove( cmd,
										 path,
										 short_opt.c_str(),
										 gnu_opt,
										 old_opt );									 
			}
			else
			{
				builtin_complete_add( cmd, 
									  path,
									  short_opt.c_str(),
									  gnu_opt,
									  old_opt, 
									  result_mode, 
									  authoritative,
									  condition,
									  comp,
									  desc,
									  flags ); 
			}

		}	
	}
	
	return res;
}