#include "config.h"

#include <stdlib.h>
#include <stdio.h>
#include <wchar.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include <libgen.h>

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

#include "common.h"
#include "env.h"
#include "wutil.h"
#include "halloc.h"
#include "halloc_util.h"
#include "path.h"
#include "expand.h"

/**
   Unexpected error in path_get_path()
*/
#define MISSING_COMMAND_ERR_MSG _( L"Error while searching for command '%ls'" )



wchar_t *path_get_path( void *context, const wchar_t *cmd )
{
	wchar_t *path;

	CHECK( cmd, 0 );
		
	debug( 3, L"path_get_path( '%ls' )", cmd );

	if(wcschr( cmd, L'/' ) != 0 )
	{
		if( waccess( cmd, X_OK )==0 )
		{
			struct stat buff;
			wstat( cmd, &buff );
			if( S_ISREG(buff.st_mode) )
				return halloc_wcsdup( context, cmd );
			else
				return 0;
		}
	}
	else
	{
		path = env_get(L"PATH");
		if( path == 0 )
		{
			if( CONTAINS( PREFIX L"/bin", L"/bin", L"/usr/bin" ) )
			{
				path = L"/bin" ARRAY_SEP_STR L"/usr/bin";
			}
			else
			{
				path = L"/bin" ARRAY_SEP_STR L"/usr/bin" ARRAY_SEP_STR PREFIX L"/bin";
			}
		}
		
		/*
		  Allocate string long enough to hold the whole command
		*/
		wchar_t *new_cmd = halloc( context, sizeof(wchar_t)*(wcslen(cmd)+wcslen(path)+2) );
		
		/*
		  We tokenize a copy of the path, since strtok modifies
		  its arguments
		*/
		wchar_t *path_cpy = wcsdup( path );
		wchar_t *nxt_path = path;
		wchar_t *state;
			
		if( (new_cmd==0) || (path_cpy==0) )
		{
			DIE_MEM();
		}

		for( nxt_path = wcstok( path_cpy, ARRAY_SEP_STR, &state );
			 nxt_path != 0;
			 nxt_path = wcstok( 0, ARRAY_SEP_STR, &state) )
		{
			int path_len = wcslen( nxt_path );
			wcscpy( new_cmd, nxt_path );
			if( new_cmd[path_len-1] != L'/' )
			{
				new_cmd[path_len++]=L'/';
			}
			wcscpy( &new_cmd[path_len], cmd );
			if( waccess( new_cmd, X_OK )==0 )
			{
				struct stat buff;
				if( wstat( new_cmd, &buff )==-1 )
				{
					if( errno != EACCES )
					{
						wperror( L"stat" );
					}
					continue;
				}
				if( S_ISREG(buff.st_mode) )
				{
					free( path_cpy );
					return new_cmd;
				}
			}
			else
			{
				switch( errno )
				{
					case ENOENT:
					case ENAMETOOLONG:
					case EACCES:
					case ENOTDIR:
						break;
					default:
					{
						debug( 1,
							   MISSING_COMMAND_ERR_MSG,
							   new_cmd );
						wperror( L"access" );
					}
				}
			}
		}
		free( path_cpy );

	}
	return 0;
}


wchar_t *path_get_cdpath( void *context, wchar_t *dir )
{
	wchar_t *res = 0;

	if( !dir )
		return 0;


	if( dir[0] == L'/'|| (wcsncmp( dir, L"./", 2 )==0) )
	{
		struct stat buf;
		if( wstat( dir, &buf ) == 0 )
		{
			if( S_ISDIR(buf.st_mode) )
			{
				res = halloc_wcsdup( context, dir );
			}
		}
	}
	else
	{
		wchar_t *path;
		wchar_t *path_cpy;
		wchar_t *nxt_path;
		wchar_t *state;
		wchar_t *whole_path;

		path = env_get(L"CDPATH");

		if( !path || !wcslen(path) )
		{
			path = L".";
		}

		nxt_path = path;
		path_cpy = wcsdup( path );

		if( !path_cpy )
		{
			DIE_MEM();
		}

		for( nxt_path = wcstok( path_cpy, ARRAY_SEP_STR, &state );
			 nxt_path != 0;
			 nxt_path = wcstok( 0, ARRAY_SEP_STR, &state) )
		{
			wchar_t *expanded_path = expand_tilde( wcsdup(nxt_path) );

//			debug( 2, L"woot %ls\n", expanded_path );

			int path_len = wcslen( expanded_path );
			if( path_len == 0 )
			{
				free(expanded_path );
				continue;
			}

			whole_path =
				wcsdupcat2( expanded_path,
							( expanded_path[path_len-1] != L'/' )?L"/":L"",
							dir, (void *)0 );

			free(expanded_path );

			struct stat buf;
			if( wstat( whole_path, &buf ) == 0 )
			{
				if( S_ISDIR(buf.st_mode) )
				{
					res = whole_path;
					halloc_register( context, whole_path );					
					break;
				}
			}
			free( whole_path );
		}
		free( path_cpy );
	}
	return res;
}


wchar_t *path_get_config( void *context)
{
	wchar_t *xdg_dir, *home;
	int done = 0;
	wchar_t *res = 0;
	
	xdg_dir = env_get( L"XDG_CONFIG_HOME" );
	if( xdg_dir )
	{
		res = wcsdupcat( xdg_dir, L"/fish" );
		if( !create_directory( res ) )
		{
			done = 1;
		}
		else
		{
			free( res );
		}
		
	}
	else
	{		
		home = env_get( L"HOME" );
		if( home )
		{
			res = wcsdupcat( home, L"/.config/fish" );
			if( !create_directory( res ) )
			{
				done = 1;
			}
			else
			{
				free( res );
			}
		}
	}
	
	if( done )
	{
		halloc_register_function( context, &free, res );
		return res;
	}
	else
	{
		debug( 0, _(L"Unable to create a configuration directory for fish. Your personal settings will not be saved. Please set the $XDG_CONFIG_HOME variable to a directory where the current user has write access." ));
		return 0;
	}
	
}