/*
 * 				Shell Library Functions
 *
 * Copyright 1998 Marcus Meissner
 * Copyright 2002 Eric Pouech
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "config.h"

#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include <assert.h>

#include "windef.h"
#include "winerror.h"
#include "winreg.h"
#include "shellapi.h"
#include "shlobj.h"
#include "shlwapi.h"
#include "ddeml.h"

#include "wine/winbase16.h"
#include "shell32_main.h"

#include "wine/debug.h"

WINE_DEFAULT_DEBUG_CHANNEL(exec);

/* this function is supposed to expand the escape sequences found in the registry
 * some diving reported that the following were used:
 * + %1, %2...  seem to report to parameter of index N in ShellExecute pmts 
 + + %*         seem to report to all parameter (or all remaining, ie after removing
 *              the already used %1 %2...) 
 * + %L         seems to be %1 as long filename followed by the 8+3 variation 
 * + %l         unknown
 * + %S         unknown
 * + %I         unknown
 */
static void argify(char* res, int len, const char* fmt, const char* lpFile)
{
    char        xlpFile[1024];

    while (*fmt)
    {
        if (*fmt == '%')
        {
            switch (*++fmt)
            {
            case '\0':
            case '%': 
                *res++ = '%'; 
                break;
            case '1': 
                if (SearchPathA(NULL, lpFile, ".exe", sizeof(xlpFile), xlpFile, NULL))
                {
                    strcpy(res, xlpFile); 
                    res += strlen(xlpFile); 
                }
                else
                {
                    strcpy(res, lpFile); 
                    res += strlen(lpFile); 
                }
                break;
            default: FIXME("Unknown escape sequence %%%c\n", *fmt);
            }
            fmt++;
        }
        else
            *res++ = *fmt++;
    }
    *res = '\0';
}

/*************************************************************************
 *	SHELL_FindExecutable [Internal]
 *
 * Utility for code sharing between FindExecutable and ShellExecute
 * in: 
 *      lpFile the name of a file
 *      lpOperation the operation on it (open)
 * out:
 *      lpResult a buffer, big enough :-(, to store the command to do the
 *              operation on the file
 *      key a buffer, big enough, to get the key name to do actually the
 *              command (it'll be used afterwards for more information
 *              on the operation)
 */
static HINSTANCE SHELL_FindExecutable(LPCSTR lpFile, LPCSTR lpOperation,
                                      LPSTR lpResult, LPSTR key)
{
    char *extension = NULL; /* pointer to file extension */
    char tmpext[5];         /* local copy to mung as we please */
    char filetype[256];     /* registry name for this filetype */
    LONG filetypelen = 256; /* length of above */
    char command[256];      /* command from registry */
    LONG commandlen = 256;  /* This is the most DOS can handle :) */
    char buffer[256];       /* Used to GetProfileString */
    HINSTANCE retval = 31;  /* default - 'No association was found' */
    char *tok;              /* token pointer */
    int i;                  /* random counter */
    char xlpFile[256] = ""; /* result of SearchPath */
    
    TRACE("%s\n", (lpFile != NULL) ? lpFile : "-");
    
    lpResult[0] = '\0'; /* Start off with an empty return string */
    
    /* trap NULL parameters on entry */
    if ((lpFile == NULL) || (lpResult == NULL) || (lpOperation == NULL))
    {
        WARN("(lpFile=%s,lpResult=%s,lpOperation=%s): NULL parameter\n",
             lpFile, lpOperation, lpResult);
        return 2; /* File not found. Close enough, I guess. */
    }
    
    if (SearchPathA(NULL, lpFile, ".exe", sizeof(xlpFile), xlpFile, NULL))
    {
        TRACE("SearchPathA returned non-zero\n");
        lpFile = xlpFile;
    }
    
    /* First thing we need is the file's extension */
    extension = strrchr(xlpFile, '.'); /* Assume last "." is the one; */
                                       /* File->Run in progman uses */
                                       /* .\FILE.EXE :( */
    TRACE("xlpFile=%s,extension=%s\n", xlpFile, extension);
    
    if ((extension == NULL) || (extension == &xlpFile[strlen(xlpFile)]))
    {
        WARN("Returning 31 - No association\n");
        return 31; /* no association */
    }
    
    /* Make local copy & lowercase it for reg & 'programs=' lookup */
    lstrcpynA(tmpext, extension, 5);
    CharLowerA(tmpext);
    TRACE("%s file\n", tmpext);
    
    /* Three places to check: */
    /* 1. win.ini, [windows], programs (NB no leading '.') */
    /* 2. Registry, HKEY_CLASS_ROOT\<filetype>\shell\open\command */
    /* 3. win.ini, [extensions], extension (NB no leading '.' */
    /* All I know of the order is that registry is checked before */
    /* extensions; however, it'd make sense to check the programs */
    /* section first, so that's what happens here. */
    
    if (key) *key = '\0';

    /* See if it's a program - if GetProfileString fails, we skip this
     * section. Actually, if GetProfileString fails, we've probably
     * got a lot more to worry about than running a program... */
    if (GetProfileStringA("windows", "programs", "exe pif bat com",
                          buffer, sizeof(buffer)) > 0)
    {
        for (i = 0;i<strlen(buffer); i++) buffer[i] = tolower(buffer[i]);
        
        tok = strtok(buffer, " \t"); /* ? */
        while (tok!= NULL)
        {
            if (strcmp(tok, &tmpext[1]) == 0) /* have to skip the leading "." */
            {
                strcpy(lpResult, xlpFile);
                /* Need to perhaps check that the file has a path
                 * attached */
                TRACE("found %s\n", lpResult);
                return 33;
                
		/* Greater than 32 to indicate success FIXME According to the
		 * docs, I should be returning a handle for the
		 * executable. Does this mean I'm supposed to open the
		 * executable file or something? More RTFM, I guess... */
            }
            tok = strtok(NULL, " \t");
        }
    }
    
    /* Check registry */
    if (RegQueryValueA(HKEY_CLASSES_ROOT, tmpext, filetype,
                       &filetypelen) == ERROR_SUCCESS)
    {
	filetype[filetypelen] = '\0';
	TRACE("File type: %s\n", filetype);
        
	/* Looking for ...buffer\shell\lpOperation\command */
	strcat(filetype, "\\shell\\");
	strcat(filetype, lpOperation);
	strcat(filetype, "\\command");
	
	if (RegQueryValueA(HKEY_CLASSES_ROOT, filetype, command,
                           &commandlen) == ERROR_SUCCESS)
	{
            if (key) strcpy(key, filetype);
#if 0
            LPSTR tmp;
            char param[256];
	    LONG paramlen = 256;

            /* FIXME: it seems all Windows version don't behave the same here.
             * the doc states that this ddeexec information can be found after
             * the exec names.
             * on Win98, it doesn't appear, but I think it does on Win2k
             */
	    /* Get the parameters needed by the application 
	       from the associated ddeexec key */ 
	    tmp = strstr(filetype, "command");
	    tmp[0] = '\0';
	    strcat(filetype, "ddeexec");
            
	    if (RegQueryValueA(HKEY_CLASSES_ROOT, filetype, param, &paramlen) == ERROR_SUCCESS)
	    {
                strcat(command, " ");
                strcat(command, param);
                commandlen += paramlen;
	    }
#endif
	    command[commandlen] = '\0';
            argify(lpResult, sizeof(lpResult), command, xlpFile);
	    retval = 33; /* FIXME see above */
	}
    }
    else /* Check win.ini */
    {
	/* Toss the leading dot */
	extension++;
	if (GetProfileStringA("extensions", extension, "", command,
                              sizeof(command)) > 0)
        {
            if (strlen(command) != 0)
            {
                strcpy(lpResult, command);
                tok = strstr(lpResult, "^"); /* should be ^.extension? */
                if (tok != NULL)
                {
                    tok[0] = '\0';
                    strcat(lpResult, xlpFile); /* what if no dir in xlpFile? */
                    tok = strstr(command, "^"); /* see above */
                    if ((tok != NULL) && (strlen(tok)>5))
                    {
                        strcat(lpResult, &tok[5]);
                    }
                }
                retval = 33; /* FIXME - see above */
            }
        }
    }
    
    TRACE("returning %s\n", lpResult);
    return retval;
}

/******************************************************************
 *		dde_cb
 *
 * callback for the DDE connection. not really usefull
 */
static HDDEDATA CALLBACK dde_cb(UINT uType, UINT uFmt, HCONV hConv, 
                                HSZ hsz1, HSZ hsz2,
                                HDDEDATA hData, DWORD dwData1, DWORD dwData2)
{
    return (HDDEDATA)0;
}

/******************************************************************
 *		dde_connect
 *
 * ShellExecute helper. Used to do an operation with a DDE connection
 *
 * Handles both the direct connection (try #1), and if it fails, 
 * launching an application and trying (#2) to connect to it
 *
 */
static unsigned dde_connect(char* key, char* start, char* ddeexec, 
                            const char* lpFile, 
                            int iCmdShow, BOOL is32)
{
    char*       endkey = key + strlen(key);
    char        app[256], topic[256], ifexec[256], res[256];
    LONG        applen, topiclen, ifexeclen;
    char*       exec;
    DWORD       ddeInst = 0;
    DWORD       tid;
    HSZ         hszApp, hszTopic;
    HCONV       hConv;
    unsigned    ret = 31;

    strcpy(endkey, "\\application");
    applen = sizeof(app);
    if (RegQueryValueA(HKEY_CLASSES_ROOT, key, app, &applen) != ERROR_SUCCESS)
    {
        FIXME("default app name NIY %s\n", key);
        return 2;
    }
    
    strcpy(endkey, "\\topic");
    topiclen = sizeof(topic);
    if (RegQueryValueA(HKEY_CLASSES_ROOT, key, topic, &topiclen) != ERROR_SUCCESS)
    {
        strcpy(topic, "System");
    }
    
    if (DdeInitializeA(&ddeInst, dde_cb, APPCMD_CLIENTONLY, 0L) != DMLERR_NO_ERROR)
    {
        return 2;
    }
    
    hszApp = DdeCreateStringHandleA(ddeInst, app, CP_WINANSI);
    hszTopic = DdeCreateStringHandleA(ddeInst, topic, CP_WINANSI);
    
    hConv = DdeConnect(ddeInst, hszApp, hszTopic, NULL);
    exec = ddeexec;
    if (!hConv)
    {
        TRACE("Launching '%s'\n", start);
        ret = (is32) ? WinExec(start, iCmdShow) : WinExec16(start, iCmdShow);
        if (ret < 32)
        {
            TRACE("Couldn't launch\n");
            goto error;
        }
        hConv = DdeConnect(ddeInst, hszApp, hszTopic, NULL);
        if (!hConv)
        {
            ret = 30; /* whatever */
            goto error;
        }
        strcpy(endkey, "\\ifexec");
        ifexeclen = sizeof(ifexec);
        if (RegQueryValueA(HKEY_CLASSES_ROOT, key, ifexec, &ifexeclen) == ERROR_SUCCESS)
        {
            exec = ifexec;
        }
    }
    
    argify(res, sizeof(res), exec, lpFile);
    TRACE("%s %s => %s\n", exec, lpFile, res);
    
    ret = (DdeClientTransaction(res, strlen(res) + 1, hConv, 0L, 0, 
                                XTYP_EXECUTE, 10000, &tid) != DMLERR_NO_ERROR) ? 31 : 32;
    DdeDisconnect(hConv);
 error:
    DdeUninitialize(ddeInst);
    return ret;
}

static HINSTANCE execute_from_key(LPSTR key, LPCSTR lpFile, INT iShowCmd, BOOL is32)
{
    char cmd[1024] = "";
    LONG cmdlen = sizeof(cmd);
    HINSTANCE retval = 31;

    /* Get the application for the registry */
    if (RegQueryValueA(HKEY_CLASSES_ROOT, key, cmd, &cmdlen) == ERROR_SUCCESS)
    {
        LPSTR tmp;
        char param[256] = "";
        LONG paramlen = 256;
                
        /* Get the parameters needed by the application 
           from the associated ddeexec key */ 
        tmp = strstr(key, "command");
        assert(tmp);
        strcpy(tmp, "ddeexec");
                
        if (RegQueryValueA(HKEY_CLASSES_ROOT, key, param, &paramlen) == ERROR_SUCCESS)
        {
            TRACE("Got ddeexec %s => %s\n", key, param);
            retval = dde_connect(key, cmd, param, lpFile, iShowCmd, is32);
        }
        else
        {
            /* Is there a replace() function anywhere? */
            cmd[cmdlen] = '\0';
            argify(param, sizeof(param), cmd, lpFile);

            retval = (is32) ? WinExec(param, iShowCmd) : WinExec16(param, iShowCmd);
        }
    }
    else TRACE("ooch\n");

    return retval;
}

static HINSTANCE SHELL_Execute(HWND hWnd, LPCSTR lpOperation, LPCSTR lpFile, 
                               LPCSTR lpParameters, LPCSTR lpDirectory, 
                               INT iShowCmd, BOOL is32)
{
    HINSTANCE retval = 31;
    char old_dir[1024];
    char cmd[1024];
    
    TRACE("(%04x,'%s','%s','%s','%s',%x)\n",
          hWnd, lpOperation ? lpOperation:"<null>", lpFile ? lpFile:"<null>",
          lpParameters ? lpParameters : "<null>", 
          lpDirectory ? lpDirectory : "<null>", iShowCmd);
    
    if (lpFile == NULL) return 0; /* should not happen */
    if (lpOperation == NULL) /* default is open */
        lpOperation = "open";
    
    if (lpDirectory)
    {
        GetCurrentDirectoryA(sizeof(old_dir), old_dir);
        SetCurrentDirectoryA(lpDirectory);
    }
    
    /* First try to execute lpFile with lpParameters directly */ 
    strcpy(cmd, lpFile);
    if (lpParameters) 
    {
        strcat(cmd, " ");
        strcat(cmd, lpParameters);
    }
    
    retval = (is32) ? WinExec(cmd, iShowCmd) : WinExec16(cmd, iShowCmd);
    
    /* Unable to execute lpFile directly
       Check if we can match an application to lpFile */
    if (retval < 32)
    { 
        char lpstrProtocol[256];

        cmd[0] = '\0';
        retval = SHELL_FindExecutable(lpFile, lpOperation, cmd, lpstrProtocol);
        
        if (retval > 32)  /* Found */
        {
            TRACE("%s/%s => %s/%s\n", lpFile, lpOperation, cmd, lpstrProtocol);
            if (*lpstrProtocol)
                retval = execute_from_key(lpstrProtocol, lpFile, iShowCmd, is32);
            else
                retval = (is32) ? WinExec(cmd, iShowCmd) : WinExec16(cmd, iShowCmd);
        }
        else if (PathIsURLA((LPSTR)lpFile))    /* File not found, check for URL */
        {
            LPSTR lpstrRes;
            INT iSize;
            
            lpstrRes = strchr(lpFile, ':');
            iSize = lpstrRes - lpFile;
            
            TRACE("Got URL: %s\n", lpFile);
            /* Looking for ...protocol\shell\lpOperation\command */
            strncpy(lpstrProtocol, lpFile, iSize);
            lpstrProtocol[iSize] = '\0';
            strcat(lpstrProtocol, "\\shell\\");
            strcat(lpstrProtocol, lpOperation);
            strcat(lpstrProtocol, "\\command");
            
            /* Remove File Protocol from lpFile */
            /* In the case file://path/file     */
            if (!strncasecmp(lpFile, "file", iSize))
            {
                lpFile += iSize;
                while (*lpFile == ':') lpFile++;
            }
            
            retval = execute_from_key(lpstrProtocol, lpFile, iShowCmd, is32);
        }       
        /* Check if file specified is in the form www.??????.*** */
        else if (!strncasecmp(lpFile, "www", 3))
        {
            /* if so, append lpFile http:// and call ShellExecute */ 
            char lpstrTmpFile[256] = "http://" ;
            strcat(lpstrTmpFile, lpFile);
            retval = ShellExecuteA(hWnd, lpOperation, lpstrTmpFile, NULL, NULL, 0);
        }
    }
    if (lpDirectory)
        SetCurrentDirectoryA(old_dir);
    return retval;
}

/*************************************************************************
 * FindExecutableA			[SHELL32.@]
 */
HINSTANCE WINAPI FindExecutableA(LPCSTR lpFile, LPCSTR lpDirectory, LPSTR lpResult)
{ 
    HINSTANCE retval = 31;    /* default - 'No association was found' */
    char old_dir[1024];
    
    TRACE("File %s, Dir %s\n", 
          (lpFile != NULL ? lpFile : "-"), (lpDirectory != NULL ? lpDirectory : "-"));

    lpResult[0] = '\0'; /* Start off with an empty return string */

    /* trap NULL parameters on entry */
    if ((lpFile == NULL) || (lpResult == NULL))
    {
        /* FIXME - should throw a warning, perhaps! */
	return 2; /* File not found. Close enough, I guess. */
    }

    if (lpDirectory)
    {
        GetCurrentDirectoryA(sizeof(old_dir), old_dir);
        SetCurrentDirectoryA(lpDirectory);
    }
    
    retval = SHELL_FindExecutable(lpFile, "open", lpResult, NULL);
    
    TRACE("returning %s\n", lpResult);
    if (lpDirectory)
        SetCurrentDirectoryA(old_dir);
    return retval;
}

/*************************************************************************
 * FindExecutableW			[SHELL32.@]
 */
HINSTANCE WINAPI FindExecutableW(LPCWSTR lpFile, LPCWSTR lpDirectory, LPWSTR lpResult)
{
    FIXME("(%p,%p,%p): stub\n", lpFile, lpDirectory, lpResult);
    return 31;    /* default - 'No association was found' */
}

/*************************************************************************
 *				ShellExecute		[SHELL.20]
 */
HINSTANCE16 WINAPI ShellExecute16( HWND16 hWnd, LPCSTR lpOperation,
                                   LPCSTR lpFile, LPCSTR lpParameters,
                                   LPCSTR lpDirectory, INT16 iShowCmd )
{   
    return (HINSTANCE16)SHELL_Execute(hWnd, lpOperation, lpFile, 
                                      lpParameters, lpDirectory, iShowCmd, FALSE );
}

/*************************************************************************
 * ShellExecuteA			[SHELL32.290]
 */
HINSTANCE WINAPI ShellExecuteA(HWND hWnd, LPCSTR lpOperation,LPCSTR lpFile, 
                               LPCSTR lpParameters,LPCSTR lpDirectory, INT iShowCmd)
{
    TRACE("\n");
    return SHELL_Execute( hWnd, lpOperation, lpFile, lpParameters,
                          lpDirectory, iShowCmd, TRUE );
}

/*************************************************************************
 * ShellExecuteW			[SHELL32.294]
 * from shellapi.h
 * WINSHELLAPI HINSTANCE APIENTRY ShellExecuteW(HWND hwnd, LPCWSTR lpOperation, 
 * LPCWSTR lpFile, LPCWSTR lpParameters, LPCWSTR lpDirectory, INT nShowCmd);   
 */
HINSTANCE WINAPI ShellExecuteW(HWND hwnd, LPCWSTR lpOperation, LPCWSTR lpFile, 
                               LPCWSTR lpParameters, LPCWSTR lpDirectory, INT nShowCmd)
{
       FIXME(": stub\n");
       return 0;
}