/* NetHack 3.7	mhmsgwnd.c	$NHDT-Date: 1596498357 2020/08/03 23:45:57 $  $NHDT-Branch: NetHack-3.7 $:$NHDT-Revision: 1.40 $ */
/* Copyright (C) 2001 by Alex Kompel */
/* NetHack may be freely redistributed.  See license for details. */

#include "winMS.h"
#include "mhmsgwnd.h"
#include "mhmsg.h"
#include "mhfont.h"

#define MSG_WRAP_TEXT

#define MSG_VISIBLE_LINES max(iflags.wc_vary_msgcount, 1)
#define MSG_LINES (int) min(iflags.msg_history, MAX_MSG_HISTORY)
#define MAXWINDOWTEXT TBUFSZ

#define DEFAULT_COLOR_BG_MSG COLOR_WINDOW
#define DEFAULT_COLOR_FG_MSG COLOR_WINDOWTEXT

#define MORE "--More--"

struct window_line {
    int attr;
    char text[MAXWINDOWTEXT + 1];
};

typedef struct mswin_nethack_message_window {
    size_t max_text;
    struct window_line window_text[MAX_MSG_HISTORY];
    int lines_last_turn; /* lines added during the last turn */
    int lines_not_seen;  /* lines not yet seen by user after last turn or
                            --More-- */
    int nevermore;       /* We want no more --More-- prompts */

    int xChar;  /* horizontal scrolling unit */
    int yChar;  /* vertical scrolling unit */
    int xUpper; /* average width of uppercase letters */
    int xPos;   /* current horizontal scrolling position */
    int yPos;   /* current vertical scrolling position */
    int xMax;   /* maximum horizontal scrolling position */
    int yMax;   /* maximum vertical scrolling position */
    int xPage;  /* page size of horizontal scroll bar */
} NHMessageWindow, *PNHMessageWindow;
#define LINE_PADDING_LEFT(data)  (data->xChar * (2 - data->xPos))
#define LINE_PADDING_RIGHT(data)  (0)

static TCHAR szMessageWindowClass[] = TEXT("MSNHMessageWndClass");
LRESULT CALLBACK NHMessageWndProc(HWND, UINT, WPARAM, LPARAM);
static void register_message_window_class(void);
static void onMSNHCommand(HWND hWnd, WPARAM wParam, LPARAM lParam);
static void onMSNH_VScroll(HWND hWnd, WPARAM wParam, LPARAM lParam);
#ifndef MSG_WRAP_TEXT
static void onMSNH_HScroll(HWND hWnd, WPARAM wParam, LPARAM lParam);
#endif
static COLORREF setMsgTextColor(HDC hdc, int gray);
static void onPaint(HWND hWnd);
static void onCreate(HWND hWnd, WPARAM wParam, LPARAM lParam);
static BOOL can_append_text(HWND hWnd, int attr, const char *text);
/* check if text can be appended to the last line without wrapping */

static BOOL more_prompt_check(HWND hWnd);
/* check if "--more--" prompt needs to be displayed */

#ifdef USER_SOUNDS
extern void play_sound_for_message(const char *str);
#endif

HWND
mswin_init_message_window(void)
{
    static int run_once = 0;
    HWND ret;
    DWORD style;
    RECT rt;

    if (!run_once) {
        register_message_window_class();
        run_once = 1;
    }

    /* get window position */
    if (GetNHApp()->bAutoLayout) {
        SetRect(&rt, 0, 0, 0, 0);
    } else {
        mswin_get_window_placement(NHW_MESSAGE, &rt);
    }

#ifdef MSG_WRAP_TEXT
    style = WS_CHILD | WS_CLIPSIBLINGS | WS_VSCROLL | WS_SIZEBOX;
#else
    style = WS_CHILD | WS_CLIPSIBLINGS | WS_VSCROLL | WS_HSCROLL | WS_SIZEBOX;
#endif

    ret = CreateWindowEx(
        WS_EX_CLIENTEDGE, szMessageWindowClass, /* registered class name */
        NULL,                                   /* window name */
        style,                                  /* window style */
        rt.left,              /* horizontal position of window */
        rt.top,               /* vertical position of window */
        rt.right - rt.left,   /* window width */
        rt.bottom - rt.top,   /* window height */
        GetNHApp()->hMainWnd, /* handle to parent or owner window */
        NULL,                 /* menu handle or child identifier */
        GetNHApp()->hApp,     /* handle to application instance */
        NULL);                /* window-creation data */

    if (!ret)
        panic("Cannot create message window");

    /* Set window caption */
    SetWindowText(ret, "Messages");

    mswin_apply_window_style(ret);

    return ret;
}

void
register_message_window_class(void)
{
    WNDCLASS wcex;
    ZeroMemory(&wcex, sizeof(wcex));

    wcex.style = CS_NOCLOSE;
    wcex.lpfnWndProc = (WNDPROC) NHMessageWndProc;
    wcex.cbClsExtra = 0;
    wcex.cbWndExtra = 0;
    wcex.hInstance = GetNHApp()->hApp;
    wcex.hIcon = NULL;
    wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground = message_bg_brush
                             ? message_bg_brush
                             : SYSCLR_TO_BRUSH(DEFAULT_COLOR_BG_MSG);
    wcex.lpszMenuName = NULL;
    wcex.lpszClassName = szMessageWindowClass;

    RegisterClass(&wcex);
}

LRESULT CALLBACK
NHMessageWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message) {
    case WM_CREATE:
        onCreate(hWnd, wParam, lParam);
        break;

    case WM_MSNH_COMMAND:
        onMSNHCommand(hWnd, wParam, lParam);
        break;

    case WM_PAINT:
        onPaint(hWnd);
        break;

    case WM_SETFOCUS:
        SetFocus(GetNHApp()->hMainWnd);
        break;

#ifndef MSG_WRAP_TEXT
    case WM_HSCROLL:
        onMSNH_HScroll(hWnd, wParam, lParam);
        break;
#endif

    case WM_VSCROLL:
        onMSNH_VScroll(hWnd, wParam, lParam);
        break;

    case WM_DESTROY: {
        PNHMessageWindow data;
        data = (PNHMessageWindow) GetWindowLongPtr(hWnd, GWLP_USERDATA);
        free(data);
        SetWindowLongPtr(hWnd, GWLP_USERDATA, (LONG_PTR) 0);
    } break;

    case WM_SIZE: {
        SCROLLINFO si;
        int xNewSize;
        int yNewSize;
        PNHMessageWindow data;
        RECT rt;

        data = (PNHMessageWindow) GetWindowLongPtr(hWnd, GWLP_USERDATA);

        xNewSize = LOWORD(lParam);
        yNewSize = HIWORD(lParam);

        if (xNewSize > 0 || yNewSize > 0) {
#ifndef MSG_WRAP_TEXT
            data->xPage = xNewSize / data->xChar;
            data->xMax = max(0, (int) (1 + data->max_text - data->xPage));
            data->xPos = min(data->xPos, data->xMax);

            ZeroMemory(&si, sizeof(si));
            si.cbSize = sizeof(si);
            si.fMask = SIF_RANGE | SIF_PAGE | SIF_POS;
            si.nMin = 0;
            si.nMax = data->max_text;
            si.nPage = data->xPage;
            si.nPos = data->xPos;
            SetScrollInfo(hWnd, SB_HORZ, &si, TRUE);
#endif

            data->yMax = MSG_LINES - 1;
            data->yPos = min(data->yPos, data->yMax);

            ZeroMemory(&si, sizeof(si));
            si.cbSize = sizeof(si);
            si.fMask = SIF_RANGE | SIF_PAGE | SIF_POS;
            si.nMin = MSG_VISIBLE_LINES;
            si.nMax = data->yMax + MSG_VISIBLE_LINES - 1;
            si.nPage = MSG_VISIBLE_LINES;
            si.nPos = data->yPos;
            SetScrollInfo(hWnd, SB_VERT, &si, TRUE);
        }

        /* update NetHack internal window position */
        GetWindowRect(hWnd, &rt);
        ScreenToClient(GetNHApp()->hMainWnd, (LPPOINT) &rt);
        ScreenToClient(GetNHApp()->hMainWnd, ((LPPOINT) &rt) + 1);
        mswin_update_window_placement(NHW_MESSAGE, &rt);

        /* redraw window - it does not handle incremental resizing too well */
        InvalidateRect(hWnd, NULL, TRUE);
    } break;

    case WM_MOVE: {
        RECT rt;
        GetWindowRect(hWnd, &rt);
        ScreenToClient(GetNHApp()->hMainWnd, (LPPOINT) &rt);
        ScreenToClient(GetNHApp()->hMainWnd, ((LPPOINT) &rt) + 1);
        mswin_update_window_placement(NHW_MESSAGE, &rt);
    } break;

    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}

void
onMSNHCommand(HWND hWnd, WPARAM wParam, LPARAM lParam)
{
    PNHMessageWindow data;

    data = (PNHMessageWindow) GetWindowLongPtr(hWnd, GWLP_USERDATA);
    switch (wParam) {
    case MSNH_MSG_PUTSTR: {
        /* Add the passed in message to the existing text.  Support the
         * adding of text that ends in newline.  A newline in text
         * will force any subsequent text that is added to be added on
         * a new output line.
         *
         * TODO: Text can be added with newlines occurring within the text not
         *       just at the end.  As currently implemented, this can cause
         *       the text to be rendered such that the text following the
         *       newline is rendered on a new line.  This can cause a poor
         *       user experience when the user has set only a single text line
         *       for the message window.  In this case, the user will not see
         *       any line other then the last line of text and the --MORE--
         *       message thus missing any text that appears before the last
         *       embedded newline.  This does not meet the requirements of the
         *       message window.
         *       This code should be changed to do the right thing and split
         *       the text so that only lines that end in newlines are added to
         *       the stored window text.
         */
        PMSNHMsgPutstr msg_data = (PMSNHMsgPutstr) lParam;
        SCROLLINFO si;
        char *p;

        if (msg_data->append == 1) {
            /* Forcibly append to line, even if we pass the edge */
            strncat(data->window_text[MSG_LINES - 1].text, msg_data->text,
                    MAXWINDOWTEXT
                        - strlen(data->window_text[MSG_LINES - 1].text));
        } else if (msg_data->append < 0) {
            /* remove that many chars */
            int len = strlen(data->window_text[MSG_LINES - 1].text);
            int newend = max(len + msg_data->append, 0);
            data->window_text[MSG_LINES - 1].text[newend] = '\0';
        } else {
            if (can_append_text(hWnd, msg_data->attr, msg_data->text)) {
                strncat(data->window_text[MSG_LINES - 1].text, "  ",
                        MAXWINDOWTEXT
                            - strlen(data->window_text[MSG_LINES - 1].text));
                strncat(data->window_text[MSG_LINES - 1].text, msg_data->text,
                        MAXWINDOWTEXT
                            - strlen(data->window_text[MSG_LINES - 1].text));
            } else {
                /* check for "--more--" */
                if (!data->nevermore && more_prompt_check(hWnd)) {
                    int okkey = 0;
                    char tmptext[MAXWINDOWTEXT + 1];

                    // @@@ Ok responses

                    /* save original text */
                    strcpy(tmptext, data->window_text[MSG_LINES - 1].text);

                    /* text could end in newline so strip it */
                    strip_newline(data->window_text[MSG_LINES - 1].text);

                    /* append more prompt and indicate the update */
                    strncat(
                        data->window_text[MSG_LINES - 1].text, MORE,
                        MAXWINDOWTEXT
                            - strlen(data->window_text[MSG_LINES - 1].text));
                    InvalidateRect(hWnd, NULL, TRUE);

                    /* get the input */
                    while (!okkey) {
                        int c = mswin_nhgetch();

                        switch (c) {
                        /* space or enter */
                        case ' ':
                        case '\015':
                            okkey = 1;
                            break;
                        /* ESC */
                        case '\033':
                            data->nevermore = 1;
                            okkey = 1;
                            break;
                        default:
                            break;
                        }
                    }

                    /* restore original text */
                    strcpy(data->window_text[MSG_LINES - 1].text, tmptext);

                    data->lines_not_seen = 0;
                }

                /* check if the string is empty */
                for (p = data->window_text[MSG_LINES - 1].text;
                     *p && isspace((uchar) *p); p++)
                    ;

                if (*p) {
                    /* last string is not empty - scroll up */
                    memmove(&data->window_text[0], &data->window_text[1],
                            (MSG_LINES - 1) * sizeof(data->window_text[0]));
                }

                /* append new text to the end of the array */
                data->window_text[MSG_LINES - 1].attr = msg_data->attr;
                strncpy(data->window_text[MSG_LINES - 1].text, msg_data->text,
                        MAXWINDOWTEXT);

                data->lines_not_seen++;
                data->lines_last_turn++;
            }
        }

        /* reset V-scroll position to display new text */
        data->yPos = data->yMax;

        ZeroMemory(&si, sizeof(si));
        si.cbSize = sizeof(si);
        si.fMask = SIF_POS;
        si.nPos = data->yPos;
        SetScrollInfo(hWnd, SB_VERT, &si, TRUE);

        /* update window content */
        InvalidateRect(hWnd, NULL, TRUE);

#ifdef USER_SOUNDS
        if (!GetNHApp()->bNoSounds)
            play_sound_for_message(msg_data->text);
#endif
    } break;

    case MSNH_MSG_CLEAR_WINDOW: {
        data->lines_last_turn = 0;
        data->lines_not_seen = 0;
        data->nevermore = 0;
        break;
    }
    case MSNH_MSG_CARET:
        /* Create or destroy a caret */
        if (*(int *) lParam)
            CreateCaret(hWnd, NULL, 0, data->yChar);
        else {
            DestroyCaret();
            /* this means we just did something interactive in this window, so
               we
               don't need a --More-- for the lines above.
               */
            data->lines_not_seen = 0;
        }
        break;

    case MSNH_MSG_GETTEXT: {
        PMSNHMsgGetText msg_data = (PMSNHMsgGetText) lParam;
        int i;
        size_t buflen;

        buflen = 0;
        for (i = 0; i < MSG_LINES; i++)
            if (*data->window_text[i].text) {
                strncpy(&msg_data->buffer[buflen], data->window_text[i].text,
                        msg_data->max_size - buflen);
                buflen += strlen(data->window_text[i].text);
                if (buflen >= msg_data->max_size)
                    break;

                strncpy(&msg_data->buffer[buflen], "\r\n",
                        msg_data->max_size - buflen);
                buflen += 2;
                if (buflen > msg_data->max_size)
                    break;
            }
    } break;

    case MSNH_MSG_RANDOM_INPUT:
        nhassert(0); // unexpected
        break;

    } /* switch( wParam ) */
}

void
onMSNH_VScroll(HWND hWnd, WPARAM wParam, LPARAM lParam)
{
    PNHMessageWindow data;
    SCROLLINFO si;
    int yInc;

    UNREFERENCED_PARAMETER(lParam);

    /* get window data */
    data = (PNHMessageWindow) GetWindowLongPtr(hWnd, GWLP_USERDATA);

    ZeroMemory(&si, sizeof(si));
    si.cbSize = sizeof(si);
    si.fMask = SIF_PAGE | SIF_POS;
    GetScrollInfo(hWnd, SB_VERT, &si);

    switch (LOWORD(wParam)) {
    // User clicked the shaft above the scroll box.

    case SB_PAGEUP:
        yInc = -(int) si.nPage;
        break;

    // User clicked the shaft below the scroll box.

    case SB_PAGEDOWN:
        yInc = si.nPage;
        break;

    // User clicked the top arrow.

    case SB_LINEUP:
        yInc = -1;
        break;

    // User clicked the bottom arrow.

    case SB_LINEDOWN:
        yInc = 1;
        break;

    // User dragged the scroll box.

    case SB_THUMBTRACK:
        yInc = HIWORD(wParam) - data->yPos;
        break;

    default:
        yInc = 0;
    }

    // If applying the vertical scrolling increment does not
    // take the scrolling position out of the scrolling range,
    // increment the scrolling position, adjust the position
    // of the scroll box, and update the window. UpdateWindow
    // sends the WM_PAINT message.

    if (yInc = max(MSG_VISIBLE_LINES - data->yPos,
                   min(yInc, data->yMax - data->yPos))) {
        data->yPos += yInc;
        /* ScrollWindowEx(hWnd, 0, -data->yChar * yInc,
                (CONST RECT *) NULL, (CONST RECT *) NULL,
                (HRGN) NULL, (LPRECT) NULL, SW_INVALIDATE | SW_ERASE);
        */
        InvalidateRect(hWnd, NULL, TRUE);

        ZeroMemory(&si, sizeof(si));
        si.cbSize = sizeof(si);
        si.fMask = SIF_POS;
        si.nPos = data->yPos;
        SetScrollInfo(hWnd, SB_VERT, &si, TRUE);

        UpdateWindow(hWnd);
    }
}

#ifndef MSG_WRAP_TEXT
void
onMSNH_HScroll(HWND hWnd, WPARAM wParam, LPARAM lParam)
{
    PNHMessageWindow data;
    SCROLLINFO si;
    int xInc;

    /* get window data */
    data = (PNHMessageWindow) GetWindowLongPtr(hWnd, GWLP_USERDATA);

    ZeroMemory(&si, sizeof(si));
    si.cbSize = sizeof(si);
    si.fMask = SIF_PAGE;
    GetScrollInfo(hWnd, SB_HORZ, &si);

    switch (LOWORD(wParam)) {
    // User clicked shaft left of the scroll box.

    case SB_PAGEUP:
        xInc = -(int) si.nPage;
        break;

    // User clicked shaft right of the scroll box.

    case SB_PAGEDOWN:
        xInc = si.nPage;
        break;

    // User clicked the left arrow.

    case SB_LINEUP:
        xInc = -1;
        break;

    // User clicked the right arrow.

    case SB_LINEDOWN:
        xInc = 1;
        break;

    // User dragged the scroll box.

    case SB_THUMBTRACK:
        xInc = HIWORD(wParam) - data->xPos;
        break;

    default:
        xInc = 0;
    }

    // If applying the horizontal scrolling increment does not
    // take the scrolling position out of the scrolling range,
    // increment the scrolling position, adjust the position
    // of the scroll box, and update the window.

    if (xInc = max(-data->xPos, min(xInc, data->xMax - data->xPos))) {
        data->xPos += xInc;
        ScrollWindowEx(hWnd, -data->xChar * xInc, 0, (CONST RECT *) NULL,
                       (CONST RECT *) NULL, (HRGN) NULL, (LPRECT) NULL,
                       SW_INVALIDATE | SW_ERASE);

        ZeroMemory(&si, sizeof(si));
        si.cbSize = sizeof(si);
        si.fMask = SIF_POS;
        si.nPos = data->xPos;
        SetScrollInfo(hWnd, SB_HORZ, &si, TRUE);
        UpdateWindow(hWnd);
    }
}
#endif // MSG_WRAP_TEXT

COLORREF
setMsgTextColor(HDC hdc, int gray)
{
    COLORREF fg, color1, color2;
    if (gray) {
        if (message_bg_brush) {
            color1 = message_bg_color;
            color2 = message_fg_color;
        } else {
            color1 = (COLORREF) GetSysColor(DEFAULT_COLOR_BG_MSG);
            color2 = (COLORREF) GetSysColor(DEFAULT_COLOR_FG_MSG);
        }
        /* Make a "gray" color by taking the average of the individual R,G,B
           components of two colors. Thanks to Jonathan del Strother */
        fg = RGB((GetRValue(color1) + GetRValue(color2)) / 2,
                 (GetGValue(color1) + GetGValue(color2)) / 2,
                 (GetBValue(color1) + GetBValue(color2)) / 2);
    } else {
        fg = message_fg_brush ? message_fg_color
                              : (COLORREF) GetSysColor(DEFAULT_COLOR_FG_MSG);
    }

    return SetTextColor(hdc, fg);
}

void
onPaint(HWND hWnd)
{
    PAINTSTRUCT ps;
    HDC hdc;
    PNHMessageWindow data;
    RECT client_rt, draw_rt;
    int FirstLine, LastLine;
    int i, y;
    HGDIOBJ oldFont;
    TCHAR wbuf[MAXWINDOWTEXT + 2];
    size_t wlen;
    COLORREF OldBg, OldFg;

    hdc = BeginPaint(hWnd, &ps);

    OldBg = SetBkColor(
        hdc, message_bg_brush ? message_bg_color
                              : (COLORREF) GetSysColor(DEFAULT_COLOR_BG_MSG));
    OldFg = setMsgTextColor(hdc, 0);

    data = (PNHMessageWindow) GetWindowLongPtr(hWnd, GWLP_USERDATA);

    GetClientRect(hWnd, &client_rt);

    if (!IsRectEmpty(&ps.rcPaint)) {
        FirstLine = max(
            0, data->yPos - (client_rt.bottom - ps.rcPaint.top) / data->yChar
                   + 1);
        LastLine =
            min(MSG_LINES - 1,
                data->yPos
                    - (client_rt.bottom - ps.rcPaint.bottom) / data->yChar);
        y = min(ps.rcPaint.bottom, client_rt.bottom);
        for (i = LastLine; i >= FirstLine; i--) {
            char tmptext[MAXWINDOWTEXT + 1];

            draw_rt.left = LINE_PADDING_LEFT(data);
            draw_rt.right = client_rt.right - LINE_PADDING_RIGHT(data);
            draw_rt.top = y - data->yChar;
            draw_rt.bottom = y;

            cached_font * font = mswin_get_font(NHW_MESSAGE,
                                        data->window_text[i].attr, hdc, FALSE);
            oldFont = SelectObject(hdc, font->hFont);

            /* convert to UNICODE stripping newline */
            strcpy(tmptext, data->window_text[i].text);
            strip_newline(tmptext);
            NH_A2W(tmptext, wbuf, sizeof(wbuf));
            wbuf[SIZE(wbuf) - 1] = '\0';
            wlen = _tcslen(wbuf);
            setMsgTextColor(hdc, i < (MSG_LINES - data->lines_last_turn));
#ifdef MSG_WRAP_TEXT
            /* Find out how large the bounding rectangle of the text is */
            DrawText(hdc, wbuf, wlen, &draw_rt,
                     DT_NOPREFIX | DT_WORDBREAK | DT_CALCRECT);
            /* move that rectangle up, so that the bottom remains at the same
             * height */
            draw_rt.top = y - (draw_rt.bottom - draw_rt.top);
            draw_rt.bottom = y;

            /* Now really draw it */
            DrawText(hdc, wbuf, wlen, &draw_rt, DT_NOPREFIX | DT_WORDBREAK);

            /* Find out the cursor (caret) position */
            if (i == MSG_LINES - 1) {
                int nnum, numfit;
                SIZE size = {0};
                TCHAR *nbuf;
                int nlen;

                nbuf = wbuf;
                nlen = wlen;
                while (nlen) {
                    /* Get the number of characters that fit on the line */
                    GetTextExtentExPoint(hdc, nbuf, nlen,
                                         draw_rt.right - draw_rt.left,
                                         &numfit, NULL, &size);
                    /* Search back to a space */
                    nnum = numfit;
                    if (numfit < nlen) {
                        while (nnum > 0 && nbuf[nnum] != ' ')
                            nnum--;
                        /* If no space found, break wherever */
                        if (nnum == 0)
                            nnum = numfit;
                    }
                    nbuf += nnum;
                    nlen -= nnum;
                    if (*nbuf == ' ') {
                        nbuf++;
                        nlen--;
                    }
                }
                /* The last size is the size of the last line. Set the caret
                   there.
                   This will fail automatically if we don't own the caret
                   (i.e.,
                   when not in a question.)
                 */
                SetCaretPos(draw_rt.left + size.cx,
                            draw_rt.bottom - data->yChar);
            }
#else
            DrawText(hdc, wbuf, wlen, &draw_rt, DT_NOPREFIX);
            SetCaretPos(draw_rt.left + size.cx, draw_rt.bottom - data->yChar);
#endif
            SelectObject(hdc, oldFont);
            y -= draw_rt.bottom - draw_rt.top;
        }
    }
    SetTextColor(hdc, OldFg);
    SetBkColor(hdc, OldBg);
    EndPaint(hWnd, &ps);
}

void
onCreate(HWND hWnd, WPARAM wParam, LPARAM lParam)
{
    PNHMessageWindow data;
    SIZE dummy;

    UNREFERENCED_PARAMETER(wParam);
    UNREFERENCED_PARAMETER(lParam);

    /* set window data */
    data = (PNHMessageWindow) malloc(sizeof(NHMessageWindow));
    if (!data)
        panic("out of memory");
    ZeroMemory(data, sizeof(NHMessageWindow));
    data->max_text = MAXWINDOWTEXT;
    SetWindowLongPtr(hWnd, GWLP_USERDATA, (LONG_PTR) data);

    /* re-calculate window size (+ font size) */
    mswin_message_window_size(hWnd, &dummy);
}

void
mswin_message_window_size(HWND hWnd, LPSIZE sz)
{
    HDC hdc;
    HGDIOBJ saveFont;
    TEXTMETRIC tm;
    PNHMessageWindow data;
    RECT rt, client_rt;

    data = (PNHMessageWindow) GetWindowLongPtr(hWnd, GWLP_USERDATA);
    if (!data)
        return;

    /* -- Calculate the font size -- */
    /* Get the handle to the client area's device context. */
    hdc = GetDC(hWnd);
    cached_font * font = mswin_get_font(NHW_MESSAGE, ATR_NONE, hdc, FALSE);
    saveFont = SelectObject(hdc, font->hFont);

    /* Extract font dimensions from the text metrics. */
    GetTextMetrics(hdc, &tm);
    data->xChar = tm.tmAveCharWidth;
    data->xUpper = (tm.tmPitchAndFamily & 1 ? 3 : 2) * data->xChar / 2;
    data->yChar = tm.tmHeight + tm.tmExternalLeading;
    data->xPage = 1;

    /* Free the device context.  */
    SelectObject(hdc, saveFont);
    ReleaseDC(hWnd, hdc);

    /* -- calculate window size -- */
    GetWindowRect(hWnd, &rt);
    sz->cx = rt.right - rt.left;
    sz->cy = rt.bottom - rt.top;

    /* set size to accommodate MSG_VISIBLE_LINES and
       horizontal scroll bar (difference between window rect and client rect
       */
    GetClientRect(hWnd, &client_rt);
    sz->cy = sz->cy - (client_rt.bottom - client_rt.top)
             + data->yChar * MSG_VISIBLE_LINES;
}

/* check if text can be appended to the last line without wrapping */
BOOL
can_append_text(HWND hWnd, int attr, const char *text)
{
    PNHMessageWindow data;
    char tmptext[MAXWINDOWTEXT + 1];
    HDC hdc;
    HGDIOBJ saveFont;
    RECT draw_rt;
    BOOL retval = FALSE;

    data = (PNHMessageWindow) GetWindowLongPtr(hWnd, GWLP_USERDATA);

    /* cannot append if lines_not_seen is 0 (beginning of the new turn */
    if (data->lines_not_seen == 0)
        return FALSE;

    /* cannot append text with different attributes */
    if (data->window_text[MSG_LINES - 1].attr != attr)
        return FALSE;

    /* cannot append if current line ends in newline */
    if (str_end_is(data->window_text[MSG_LINES - 1].text, "\n"))
        return FALSE;

    /* check if the maximum string length will be exceeded */
    if (strlen(data->window_text[MSG_LINES - 1].text) + 2
            + /* space characters */
            strlen(text) + strlen(MORE)
        >= MAXWINDOWTEXT)
        return FALSE;

    /* check if the text is going to fit into a single line */
    strcpy(tmptext, data->window_text[MSG_LINES - 1].text);
    strcat(tmptext, "  ");
    strcat(tmptext, text);
    strip_newline(tmptext);
    strcat(tmptext, MORE);

    hdc = GetDC(hWnd);
    cached_font * font = mswin_get_font(NHW_MESSAGE,
                            data->window_text[MSG_LINES - 1].attr, hdc, FALSE);
    saveFont = SelectObject(hdc, font->hFont);
    GetClientRect(hWnd, &draw_rt);
    draw_rt.left += LINE_PADDING_LEFT(data);
    draw_rt.right -= LINE_PADDING_RIGHT(data);
    draw_rt.bottom = draw_rt.top; /* we only need width for the DrawText */
    DrawText(hdc, tmptext, strlen(tmptext), &draw_rt,
             DT_NOPREFIX | DT_WORDBREAK | DT_CALCRECT);

    /* we will check against 1.5 of the font size in order to determine
       if the text is single-line or not - just to be on the safe size */
    retval = (draw_rt.bottom - draw_rt.top) < (data->yChar + data->yChar / 2);

    /* free device context */
    SelectObject(hdc, saveFont);
    ReleaseDC(hWnd, hdc);
    return retval;
}

/* check if "--more--" prompt needs to be displayed
   basically, check if the lines not seen are going to find in the message
   window
*/
BOOL
more_prompt_check(HWND hWnd)
{
    PNHMessageWindow data;
    HDC hdc;
    HGDIOBJ saveFont;
    RECT client_rt, draw_rt;
    int i;
    int remaining_height;
    char tmptext[MAXWINDOWTEXT + 1];

    data = (PNHMessageWindow) GetWindowLongPtr(hWnd, GWLP_USERDATA);

    if (data->lines_not_seen == 0)
        return FALSE; /* don't bother checking - nothig to "more" */
    if (data->lines_not_seen >= MSG_LINES)
        return TRUE; /* history size exceeded - always more */

    GetClientRect(hWnd, &client_rt);
    remaining_height = client_rt.bottom - client_rt.top;

    hdc = GetDC(hWnd);
    cached_font * font = mswin_get_font(NHW_MESSAGE, ATR_NONE, hdc, FALSE);
    saveFont = SelectObject(hdc, font->hFont);
    for (i = 0; i < data->lines_not_seen; i++) {
        /* we only need width for the DrawText */
        SetRect(&draw_rt,
            client_rt.left + LINE_PADDING_LEFT(data), client_rt.top,
            client_rt.right - LINE_PADDING_RIGHT(data), client_rt.top);
        font = mswin_get_font(NHW_MESSAGE,
                        data->window_text[MSG_LINES - i - 1].attr, hdc, FALSE);
        SelectObject(hdc, font->hFont);

        strcpy(tmptext, data->window_text[MSG_LINES - i - 1].text);
        strip_newline(tmptext);

        if (i == 0)
            strcat(tmptext, MORE);

        remaining_height -=
            DrawText(hdc, tmptext, strlen(tmptext), &draw_rt,
                     DT_NOPREFIX | DT_WORDBREAK | DT_CALCRECT);
        if (remaining_height <= 0)
            break;
    }

    /* free device context */
    SelectObject(hdc, saveFont);
    ReleaseDC(hWnd, hdc);
    return (remaining_height
            <= 0); /* TRUE if lines_not_seen take more that window height */
}