/*
 *  CMDINPUT.C - handles command input (tab completion, history, etc.).
 *
 *
 *  History:
 *
 *    01/14/95 (Tim Norman)
 *        started.
 *
 *    08/08/95 (Matt Rains)
 *        i have cleaned up the source code. changes now bring this source
 *        into guidelines for recommended programming practice.
 *        i have added some constants to help making changes easier.
 *
 *    12/12/95 (Tim Norman)
 *        added findxy() function to get max x/y coordinates to display
 *        correctly on larger screens
 *
 *    12/14/95 (Tim Norman)
 *        fixed the Tab completion code that Matt Rains broke by moving local
 *        variables to a more global scope and forgetting to initialize them
 *        when needed
 *
 *    8/1/96 (Tim Norman)
 *        fixed a bug in tab completion that caused filenames at the beginning
 *        of the command-line to have their first letter truncated
 *
 *    9/1/96 (Tim Norman)
 *        fixed a silly bug using printf instead of fputs, where typing "%i"
 *        confused printf :)
 *
 *    6/14/97 (Steffan Kaiser)
 *        ctrl-break checking
 *
 *    6/7/97 (Marc Desrochers)
 *        recoded everything! now properly adjusts when text font is changed.
 *        removed findxy(), reposition(), and reprint(), as these functions
 *        were inefficient. added goxy() function as gotoxy() was buggy when
 *        the screen font was changed. the printf() problem with %i on the
 *        command line was fixed by doing printf("%s",str) instead of
 *        printf(str). Don't ask how I find em just be glad I do :)
 *
 *    7/12/97 (Tim Norman)
 *        Note: above changes preempted Steffan's ctrl-break checking.
 *
 *    7/7/97 (Marc Desrochers)
 *        rewrote a new findxy() because the new dir() used it.  This
 *        findxy() simply returns the values of *maxx *maxy.  In the
 *        future, please use the pointers, they will always be correct
 *        since they point to BIOS values.
 *
 *    7/8/97 (Marc Desrochers)
 *        once again removed findxy(), moved the *maxx, *maxy pointers
 *        global and included them as externs in command.h.  Also added
 *        insert/overstrike capability
 *
 *    7/13/97 (Tim Norman)
 *        added different cursor appearance for insert/overstrike mode
 *
 *    7/13/97 (Tim Norman)
 *        changed my code to use _setcursortype until I can figure out why
 *        my code is crashing on some machines.  It doesn't crash on mine :)
 *
 *    27-Jul-1998 (John P Price <linux-guru@gcfl.net>)
 *        added config.h include
 *
 *    28-Jul-1998 (John P Price <linux-guru@gcfl.net>)
 *        put ifdef's around filename completion code.
 *
 *    30-Jul-1998 (John P Price <linux-guru@gcfl.net>)
 *        moved filename completion code to filecomp.c
 *        made second TAB display list of filename matches
 *
 *    31-Jul-1998 (John P Price <linux-guru@gcfl.net>)
 *        Fixed bug where if you typed something, then hit HOME, then tried
 *        to type something else in insert mode, it crashed.
 *
 *    07-Aug-1998 (John P Price <linux-guru@gcfl.net>)
 *        Fixed carriage return output to better match MSDOS with echo
 *        on or off.(marked with "JPP 19980708")
 *
 *    13-Dec-1998 (Eric Kohl)
 *        Added insert/overwrite cursor.
 *
 *    25-Jan-1998 (Eric Kohl)
 *        Replaced CRT io functions by Win32 console io functions.
 *        This can handle <Shift>-<Tab> for 4NT filename completion.
 *        Unicode and redirection safe!
 *
 *    04-Feb-1999 (Eric Kohl)
 *        Fixed input bug. A "line feed" character remained in the keyboard
 *        input queue when you pressed <RETURN>. This sometimes caused
 *        some very strange effects.
 *        Fixed some command line editing annoyances.
 *
 *    30-Apr-2004 (Filip Navara <xnavara@volny.cz>)
 *        Fixed problems when the screen was scrolled away.
 *
 *    28-September-2007 (Hervé Poussineau)
 *        Added history possibilities to right key.
 */

#include "precomp.h"

/*
 * See https://technet.microsoft.com/en-us/library/cc978715.aspx
 * and https://technet.microsoft.com/en-us/library/cc940805.aspx
 * to know the differences between those two settings.
 * Values 0x00, 0x0D (carriage return) and 0x20 (space) disable completion.
 */
TCHAR AutoCompletionChar = _T('\t'); // Default is 0x20
TCHAR PathCompletionChar = _T('\t'); // Default is 0x20


SHORT maxx;
SHORT maxy;

/*
 * global command line insert/overwrite flag
 */
static BOOL bInsert = TRUE;


static VOID
ClearCommandLine(LPTSTR str, INT maxlen, SHORT orgx, SHORT orgy)
{
    INT count;

    SetCursorXY (orgx, orgy);
    for (count = 0; count < (INT)_tcslen (str); count++)
        ConOutChar (_T(' '));
    _tcsnset (str, _T('\0'), maxlen);
    SetCursorXY (orgx, orgy);
}


/* read in a command line */
BOOL ReadCommand(LPTSTR str, INT maxlen)
{
    CONSOLE_SCREEN_BUFFER_INFO csbi;
    SHORT orgx;     /* origin x/y */
    SHORT orgy;
    SHORT curx;     /*current x/y cursor position*/
    SHORT cury;
    SHORT tempscreen;
    INT   count;    /*used in some for loops*/
    INT   current = 0;  /*the position of the cursor in the string (str)*/
    INT   charcount = 0;/*chars in the string (str)*/
    INPUT_RECORD ir;
    DWORD dwControlKeyState;
#ifdef FEATURE_UNIX_FILENAME_COMPLETION
    WORD   wLastKey = 0;
#endif
    TCHAR  ch;
    BOOL bReturn = FALSE;
    BOOL bCharInput;
#ifdef FEATURE_4NT_FILENAME_COMPLETION
    TCHAR szPath[MAX_PATH];
#endif
#ifdef FEATURE_HISTORY
    //BOOL bContinue=FALSE;/*is TRUE the second case will not be executed*/
    TCHAR PreviousChar;
#endif

    if (!GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &csbi))
    {
        /* No console */
        HANDLE hStdin = GetStdHandle(STD_INPUT_HANDLE);
        DWORD dwRead;
        CHAR chr;
        do
        {
            if (!ReadFile(hStdin, &chr, 1, &dwRead, NULL) || !dwRead)
                return FALSE;
#ifdef _UNICODE
            MultiByteToWideChar(InputCodePage, 0, &chr, 1, &str[charcount++], 1);
#endif
        } while (chr != '\n' && charcount < maxlen);
        str[charcount] = _T('\0');
        return TRUE;
    }

    /* get screen size */
    maxx = csbi.dwSize.X;
    maxy = csbi.dwSize.Y;

    curx = orgx = csbi.dwCursorPosition.X;
    cury = orgy = csbi.dwCursorPosition.Y;

    memset (str, 0, maxlen * sizeof (TCHAR));

    SetCursorType (bInsert, TRUE);

    do
    {
        bReturn = FALSE;
        ConInKey (&ir);

        dwControlKeyState = ir.Event.KeyEvent.dwControlKeyState;

        if (dwControlKeyState &
            (RIGHT_ALT_PRESSED |LEFT_ALT_PRESSED|
             RIGHT_CTRL_PRESSED|LEFT_CTRL_PRESSED) )
        {
            switch (ir.Event.KeyEvent.wVirtualKeyCode)
            {
#ifdef FEATURE_HISTORY
                case _T('K'):
                    /* add the current command line to the history */
                    if (dwControlKeyState &
                        (LEFT_CTRL_PRESSED|RIGHT_CTRL_PRESSED))
                    {
                        if (str[0])
                            History(0,str);

                        ClearCommandLine (str, maxlen, orgx, orgy);
                        current = charcount = 0;
                        curx = orgx;
                        cury = orgy;
                        //bContinue=TRUE;
                        break;
                    }

                case _T('D'):
                    /* delete current history entry */
                    if (dwControlKeyState &
                        (LEFT_CTRL_PRESSED|RIGHT_CTRL_PRESSED))
                    {
                        ClearCommandLine (str, maxlen, orgx, orgy);
                        History_del_current_entry(str);
                        current = charcount = _tcslen (str);
                        ConOutPrintf (_T("%s"), str);
                        GetCursorXY (&curx, &cury);
                        //bContinue=TRUE;
                        break;
                    }
#endif /*FEATURE_HISTORY*/

                case _T('M'):
                    /* ^M does the same as return */
                    if (dwControlKeyState &
                        (LEFT_CTRL_PRESSED|RIGHT_CTRL_PRESSED))
                    {
                        /* end input, return to main */
#ifdef FEATURE_HISTORY
                        /* add to the history */
                        if (str[0])
                            History(0, str);
#endif /*FEATURE_HISTORY*/
                        str[charcount++] = _T('\n');
                        str[charcount] = _T('\0');
                        ConOutChar (_T('\n'));
                        bReturn = TRUE;
                        break;
                    }
            }
        }

        bCharInput = FALSE;

        switch (ir.Event.KeyEvent.wVirtualKeyCode)
        {
            case VK_BACK:
                /* <BACKSPACE> - delete character to left of cursor */
                if (current > 0 && charcount > 0)
                {
                    if (current == charcount)
                    {
                        /* if at end of line */
                        str[current - 1] = _T('\0');
                        if (GetCursorX () != 0)
                        {
                            ConOutPrintf (_T("\b \b"));
                            curx--;
                        }
                        else
                        {
                            SetCursorXY ((SHORT)(maxx - 1), (SHORT)(GetCursorY () - 1));
                            ConOutChar (_T(' '));
                            SetCursorXY ((SHORT)(maxx - 1), (SHORT)(GetCursorY () - 1));
                            cury--;
                            curx = maxx - 1;
                        }
                    }
                    else
                    {
                        for (count = current - 1; count < charcount; count++)
                            str[count] = str[count + 1];
                        if (GetCursorX () != 0)
                        {
                            SetCursorXY ((SHORT)(GetCursorX () - 1), GetCursorY ());
                            curx--;
                        }
                        else
                        {
                            SetCursorXY ((SHORT)(maxx - 1), (SHORT)(GetCursorY () - 1));
                            cury--;
                            curx = maxx - 1;
                        }
                        GetCursorXY (&curx, &cury);
                        ConOutPrintf (_T("%s "), &str[current - 1]);
                        SetCursorXY (curx, cury);
                    }
                    charcount--;
                    current--;
                }
                break;

            case VK_INSERT:
                /* toggle insert/overstrike mode */
                bInsert ^= TRUE;
                SetCursorType (bInsert, TRUE);
                break;

            case VK_DELETE:
                /* delete character under cursor */
                if (current != charcount && charcount > 0)
                {
                    for (count = current; count < charcount; count++)
                        str[count] = str[count + 1];
                    charcount--;
                    GetCursorXY (&curx, &cury);
                    ConOutPrintf (_T("%s "), &str[current]);
                    SetCursorXY (curx, cury);
                }
                break;

            case VK_HOME:
                /* goto beginning of string */
                if (current != 0)
                {
                    SetCursorXY (orgx, orgy);
                    curx = orgx;
                    cury = orgy;
                    current = 0;
                }
                break;

            case VK_END:
                /* goto end of string */
                if (current != charcount)
                {
                    SetCursorXY (orgx, orgy);
                    ConOutPrintf (_T("%s"), str);
                    GetCursorXY (&curx, &cury);
                    current = charcount;
                }
                break;

            case VK_TAB:
#ifdef FEATURE_UNIX_FILENAME_COMPLETION
                /* expand current file name */
                if ((current == charcount) ||
                    (current == charcount - 1 &&
                     str[current] == _T('"'))) /* only works at end of line*/
                {
                    if (wLastKey != VK_TAB)
                    {
                        /* if first TAB, complete filename*/
                        tempscreen = charcount;
                        CompleteFilename (str, charcount);
                        charcount = _tcslen (str);
                        current = charcount;

                        SetCursorXY (orgx, orgy);
                        ConOutPrintf (_T("%s"), str);

                        if (tempscreen > charcount)
                        {
                            GetCursorXY (&curx, &cury);
                            for (count = tempscreen - charcount; count--; )
                                ConOutChar (_T(' '));
                            SetCursorXY (curx, cury);
                        }
                        else
                        {
                            if (((charcount + orgx) / maxx) + orgy > maxy - 1)
                                orgy += maxy - ((charcount + orgx) / maxx + orgy + 1);
                        }

                        /* set cursor position */
                        SetCursorXY ((orgx + current) % maxx,
                                 orgy + (orgx + current) / maxx);
                        GetCursorXY (&curx, &cury);
                    }
                    else
                    {
                        /*if second TAB, list matches*/
                        if (ShowCompletionMatches (str, charcount))
                        {
                            PrintPrompt();
                            GetCursorXY(&orgx, &orgy);
                            ConOutPrintf(_T("%s"), str);

                            /* set cursor position */
                            SetCursorXY((orgx + current) % maxx,
                                         orgy + (orgx + current) / maxx);
                            GetCursorXY(&curx, &cury);
                        }

                    }
                }
                else
                {
                    MessageBeep(-1);
                }
#endif
#ifdef FEATURE_4NT_FILENAME_COMPLETION
                /* used to later see if we went down to the next line */
                tempscreen = charcount;
                szPath[0]=_T('\0');

                /* str is the whole things that is on the current line
                   that is and and out.  arg 2 is weather it goes back
                    one file or forward one file */
                CompleteFilename(str, !(ir.Event.KeyEvent.dwControlKeyState & SHIFT_PRESSED), szPath, current);
                /* Attempt to clear the line */
                ClearCommandLine (str, maxlen, orgx, orgy);
                curx = orgx;
                cury = orgy;
                current = charcount = 0;

                /* Everything is deleted, lets add it back in */
                _tcscpy(str,szPath);

                /* Figure out where cusor is going to be after we print it */
                charcount = _tcslen(str);
                current = charcount;

                SetCursorXY(orgx, orgy);
                /* Print out what we have now */
                ConOutPrintf(_T("%s"), str);

                /* Move cursor accordingly */
                if (tempscreen > charcount)
                {
                    GetCursorXY(&curx, &cury);
                    for(count = tempscreen - charcount; count--; )
                        ConOutChar(_T(' '));
                    SetCursorXY(curx, cury);
                }
                else
                {
                    if (((charcount + orgx) / maxx) + orgy > maxy - 1)
                        orgy += maxy - ((charcount + orgx) / maxx + orgy + 1);
                }
                SetCursorXY((short)(((int)orgx + current) % maxx), (short)((int)orgy + ((int)orgx + current) / maxx));
                GetCursorXY(&curx, &cury);
#endif
                break;

            case _T('C'):
                if ((ir.Event.KeyEvent.dwControlKeyState &
                    (RIGHT_CTRL_PRESSED|LEFT_CTRL_PRESSED)))
                {
                    /* Ignore the Ctrl-C key event if it has already been handled */
                    if (!bCtrlBreak)
                        break;

                    /*
                     * Fully print the entered string
                     * so the command prompt would not overwrite it.
                     */
                    SetCursorXY(orgx, orgy);
                    ConOutPrintf(_T("%s"), str);

                    /*
                     * A Ctrl-C. Do not clear the command line,
                     * but return an empty string in str.
                     */
                    str[0] = _T('\0');
                    curx = orgx;
                    cury = orgy;
                    current = charcount = 0;
                    bReturn = TRUE;
                }
                else
                {
                    /* Just a normal 'C' character */
                    bCharInput = TRUE;
                }
                break;

            case VK_RETURN:
                /* end input, return to main */
#ifdef FEATURE_HISTORY
                /* add to the history */
                if (str[0])
                    History(0, str);
#endif
                str[charcount++] = _T('\n');
                str[charcount] = _T('\0');
                ConOutChar(_T('\n'));
                bReturn = TRUE;
                break;

            case VK_ESCAPE:
                /* clear str  Make this callable! */
                ClearCommandLine (str, maxlen, orgx, orgy);
                curx = orgx;
                cury = orgy;
                current = charcount = 0;
                break;

#ifdef FEATURE_HISTORY
            case VK_F3:
                History_move_to_bottom();
#endif
            case VK_UP:
#ifdef FEATURE_HISTORY
                /* get previous command from buffer */
                ClearCommandLine (str, maxlen, orgx, orgy);
                History(-1, str);
                current = charcount = _tcslen (str);
                if (((charcount + orgx) / maxx) + orgy > maxy - 1)
                    orgy += maxy - ((charcount + orgx) / maxx + orgy + 1);
                ConOutPrintf (_T("%s"), str);
                GetCursorXY (&curx, &cury);
#endif
                break;

            case VK_DOWN:
#ifdef FEATURE_HISTORY
                /* get next command from buffer */
                ClearCommandLine (str, maxlen, orgx, orgy);
                History(1, str);
                current = charcount = _tcslen (str);
                if (((charcount + orgx) / maxx) + orgy > maxy - 1)
                    orgy += maxy - ((charcount + orgx) / maxx + orgy + 1);
                ConOutPrintf (_T("%s"), str);
                GetCursorXY (&curx, &cury);
#endif
                break;

            case VK_LEFT:
                if (dwControlKeyState & (RIGHT_CTRL_PRESSED | LEFT_CTRL_PRESSED))
                {
                    /* move cursor to the previous word */
                    if (current > 0)
                    {
                        while (current > 0 && str[current - 1] == _T(' '))
                        {
                            current--;
                            if (curx == 0)
                            {
                                cury--;
                                curx = maxx -1;
                            }
                            else
                            {
                                curx--;
                            }
                        }

                        while (current > 0 && str[current -1] != _T(' '))
                        {
                            current--;
                            if (curx == 0)
                            {
                                cury--;
                                curx = maxx -1;
                            }
                            else
                            {
                                curx--;
                            }
                        }

                        SetCursorXY(curx, cury);
                    }
                }
                else
                {
                    /* move cursor left */
                    if (current > 0)
                    {
                        current--;
                        if (GetCursorX () == 0)
                        {
                            SetCursorXY ((SHORT)(maxx - 1), (SHORT)(GetCursorY () - 1));
                            curx = maxx - 1;
                            cury--;
                        }
                        else
                        {
                            SetCursorXY ((SHORT)(GetCursorX () - 1), GetCursorY ());
                            curx--;
                        }
                    }
                    else
                    {
                        MessageBeep (-1);
                    }
                }
                break;

            case VK_RIGHT:
                if (dwControlKeyState & (RIGHT_CTRL_PRESSED | LEFT_CTRL_PRESSED))
                {
                    /* move cursor to the next word */
                    if (current != charcount)
                    {
                        while (current != charcount && str[current] != _T(' '))
                        {
                            current++;
                            if (curx == maxx - 1)
                            {
                                cury++;
                                curx = 0;
                            }
                            else
                            {
                                curx++;
                            }
                        }

                        while (current != charcount && str[current] == _T(' '))
                        {
                            current++;
                            if (curx == maxx - 1)
                            {
                                cury++;
                                curx = 0;
                            }
                            else
                            {
                                curx++;
                            }
                        }

                        SetCursorXY(curx, cury);
                    }
                }
                else
                {
                    /* move cursor right */
                    if (current != charcount)
                    {
                        current++;
                        if (GetCursorX () == maxx - 1)
                        {
                            SetCursorXY (0, (SHORT)(GetCursorY () + 1));
                            curx = 0;
                            cury++;
                        }
                        else
                        {
                            SetCursorXY ((SHORT)(GetCursorX () + 1), GetCursorY ());
                            curx++;
                        }
                    }
#ifdef FEATURE_HISTORY
                    else
                    {
                        LPCTSTR last = PeekHistory(-1);
                        if (last && charcount < (INT)_tcslen (last))
                        {
                            PreviousChar = last[current];
                            ConOutChar(PreviousChar);
                            GetCursorXY(&curx, &cury);
                            str[current++] = PreviousChar;
                            charcount++;
                        }
                    }
#endif
                }
                break;

            default:
                /* This input is just a normal char */
                bCharInput = TRUE;

            }
#ifdef _UNICODE
            ch = ir.Event.KeyEvent.uChar.UnicodeChar;
            if (ch >= 32 && (charcount != (maxlen - 2)) && bCharInput)
#else
            ch = ir.Event.KeyEvent.uChar.AsciiChar;
            if ((UCHAR)ch >= 32 && (charcount != (maxlen - 2)) && bCharInput)
#endif /* _UNICODE */
            {
                /* insert character into string... */
                if (bInsert && current != charcount)
                {
                    /* If this character insertion will cause screen scrolling,
                     * adjust the saved origin of the command prompt. */
                    tempscreen = _tcslen(str + current) + curx;
                    if ((tempscreen % maxx) == (maxx - 1) &&
                        (tempscreen / maxx) + cury == (maxy - 1))
                    {
                        orgy--;
                        cury--;
                    }

                    for (count = charcount; count > current; count--)
                        str[count] = str[count - 1];
                    str[current++] = ch;
                    if (curx == maxx - 1)
                        curx = 0, cury++;
                    else
                        curx++;
                    ConOutPrintf (_T("%s"), &str[current - 1]);
                    SetCursorXY (curx, cury);
                    charcount++;
                }
                else
                {
                    if (current == charcount)
                        charcount++;
                    str[current++] = ch;
                    if (GetCursorX () == maxx - 1 && GetCursorY () == maxy - 1)
                        orgy--, cury--;
                    if (GetCursorX () == maxx - 1)
                        curx = 0, cury++;
                    else
                        curx++;
                    ConOutChar (ch);
                }
            }

        //wLastKey = ir.Event.KeyEvent.wVirtualKeyCode;
    }
    while (!bReturn);

    SetCursorType (bInsert, TRUE);

#ifdef FEATURE_ALIASES
    /* expand all aliases */
    ExpandAlias (str, maxlen);
#endif /* FEATURE_ALIAS */
    return TRUE;
}