/***************************************************************************

    file                 : guiedit.cpp
    created              : Mon Apr 24 10:23:28 CEST 2000
    copyright            : (C) 2000 by Eric Espie
    email                : torcs@free.fr
    version              : $Id: guiedit.cpp,v 1.2 2003/06/24 21:02:25 torcs Exp $

 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

/** @file   
    		GUI Edit Box Management.
    @author	<a href=mailto:torcs@free.fr>Eric Espie</a>
    @version	$Id: guiedit.cpp,v 1.2 2003/06/24 21:02:25 torcs Exp $
    @ingroup	gui
*/

#include <stdlib.h>
#include <string.h>
#ifdef WIN32
#include <windows.h>
#endif
#include <tgfclient.h>
#include "gui.h"
#include "guifont.h"

void
gfuiEditboxInit(void)
{
}

/** Add a editbox to a screen.
    @ingroup	gui
    @param	scr		Screen
    @param	text		Editbox start text
    @param	font		Font id
    @param	x		X position on screen
    @param	y		Y position on screen (0 = bottom)
    @param	width		width of the editbox (0 = text size)
    @param	maxlen		Max lenght of text (0 = text size)
    @param	userDataOnFocus	Parameter to the Focus (and lost) callback
    @param	onFocus		Focus callback function
    @param	onFocusLost	Focus Lost callback function
    @return	Editbox Id
		<br>-1 Error
 */
int
GfuiEditboxCreate(void *scr, char *text, int font, int x, int y, int width, int maxlen,
		  void *userDataOnFocus, tfuiCallback onFocus, tfuiCallback onFocusLost)
{
    tGfuiEditbox	*editbox;
    tGfuiLabel		*label;
    tGfuiObject		*object;
    tGfuiScreen		*screen = (tGfuiScreen*)scr;


    object = (tGfuiObject*)calloc(1, sizeof(tGfuiObject));
    object->widget = GFUI_EDITBOX;
    object->focusMode = GFUI_FOCUS_MOUSE_CLICK;
    object->id = screen->curId++;
    object->visible = 1;
    
    editbox = &(object->u.editbox);
    editbox->state = GFUI_BTN_RELEASED;
    editbox->userDataOnFocus = userDataOnFocus;
    editbox->onFocus = onFocus;
    editbox->onFocusLost = onFocusLost;

    editbox->bgColor[0] = &(GfuiColor[GFUI_BGBTNDISABLED][0]);
    editbox->bgColor[1] = &(GfuiColor[GFUI_BGBTNENABLED][0]);
    editbox->bgColor[2] = &(GfuiColor[GFUI_BGBTNCLICK][0]);
    editbox->bgFocusColor[0] = &(GfuiColor[GFUI_BGBTNDISABLED][0]);
    editbox->bgFocusColor[1] = &(GfuiColor[GFUI_BGBTNFOCUS][0]);
    editbox->bgFocusColor[2] = &(GfuiColor[GFUI_BGBTNCLICK][0]);
    editbox->fgColor[0] = &(GfuiColor[GFUI_BTNDISABLED][0]);
    editbox->fgColor[1] = &(GfuiColor[GFUI_BTNENABLED][0]);
    editbox->fgColor[2] = &(GfuiColor[GFUI_BTNCLICK][0]);
    editbox->fgFocusColor[0] = &(GfuiColor[GFUI_BTNDISABLED][0]);
    editbox->fgFocusColor[1] = &(GfuiColor[GFUI_BTNFOCUS][0]);
    editbox->fgFocusColor[2] = &(GfuiColor[GFUI_BTNCLICK][0]);
    editbox->cursorColor[0] = &(GfuiColor[GFUI_EDITCURSORCLR][0]);
    editbox->cursorColor[1] = &(GfuiColor[GFUI_EDITCURSORCLR][1]);
    editbox->cursorColor[2] = &(GfuiColor[GFUI_EDITCURSORCLR][2]);
    

    label = &(editbox->label);
    if (maxlen == 0) maxlen = strlen(text);
    label->text = (char*)calloc(1, maxlen+1);
    strncpy(label->text, text, maxlen+1);
    label->font = gfuiFont[font];
    label->maxlen = maxlen;
    if (width == 0) {
	char *buf;
	int  i;
	buf = (char*)malloc(maxlen+1);
	if (buf == NULL) return -1;
	for (i = 0; i < maxlen; i++) buf[i] = 'W';
	buf[i] = '\0';
	width = gfuiFont[font]->getWidth((const char *)buf);
	free(buf);
    }
    label->align = GFUI_ALIGN_HL_VC;
    label->x = object->xmin = x;
    label->y = y - 2 * gfuiFont[font]->getDescender();
    object->ymin = y;
    object->xmax = x + width;
    object->ymax = y + gfuiFont[font]->getHeight() - gfuiFont[font]->getDescender();
    editbox->cursory1 = object->ymin + 2;
    editbox->cursory2 = object->ymax - 2;
    editbox->cursorx = label->x;
    
#define HORIZ_MARGIN 10
    object->xmin -= HORIZ_MARGIN;
    object->xmax += HORIZ_MARGIN;

    gfuiAddObject(screen, object);
    return object->id;
}


/** Get the Id of the editbox focused in the current screen.
    @ingroup	gui
    @return	Editbox Id
		<br>-1 if no editbox or no screen or the focus is not on a editbox
 */
int
GfuiEditboxGetFocused(void)
{
    tGfuiObject *curObject;

    if (GfuiScreen != NULL) {
	curObject = GfuiScreen->objects;
	if (curObject != NULL) {
	    do {
		curObject = curObject->next;
		if (curObject->focus) {
		    if (curObject->widget == GFUI_EDITBOX) {
			return curObject->id;
		    }
		    return -1;
		}
	    } while (curObject != GfuiScreen->objects);
	}
    }
    return -1;
}


void
gfuiDrawEditbox(tGfuiObject *obj)
{
    tGfuiLabel		*label;
    tGfuiEditbox	*editbox;
    float		*fgColor;
    float		*bgColor;

    editbox = &(obj->u.editbox);
    if (obj->state == GFUI_DISABLE) {
	editbox->state = GFUI_BTN_DISABLE;
    } else {
	editbox->state = GFUI_BTN_RELEASED;
    }
    if (obj->focus) {
	fgColor = editbox->fgFocusColor[editbox->state];
	bgColor = editbox->bgFocusColor[editbox->state];
    } else {
	fgColor = editbox->fgColor[editbox->state];
	bgColor = editbox->bgColor[editbox->state];
    }

    glColor4fv(bgColor);
    glBegin(GL_QUADS);
    glVertex2i(obj->xmin, obj->ymin);
    glVertex2i(obj->xmin, obj->ymax);
    glVertex2i(obj->xmax, obj->ymax);
    glVertex2i(obj->xmax, obj->ymin);
    glEnd();
    
    glColor4fv(fgColor);
    glBegin(GL_LINE_STRIP);
    glVertex2i(obj->xmin, obj->ymin);
    glVertex2i(obj->xmin, obj->ymax);
    glVertex2i(obj->xmax, obj->ymax);
    glVertex2i(obj->xmax, obj->ymin);
    glVertex2i(obj->xmin, obj->ymin);
    glEnd();	
    
    label = &(editbox->label);
    glColor4fv(fgColor);
    gfuiPrintString(label->x, label->y, label->font, label->text);
    
    if ((obj->state != GFUI_DISABLE) && (obj->focus)) {
	/* draw cursor */
	glColor3fv(editbox->cursorColor[editbox->state]);
	glBegin(GL_LINES);
	glVertex2i(editbox->cursorx, editbox->cursory1);
	glVertex2i(editbox->cursorx, editbox->cursory2);
	glEnd();
    }
}


void
gfuiEditboxAction(int mouse)
{
    tGfuiObject		*object;
    tGfuiLabel		*label;
    tGfuiEditbox	*editbox;
    int			relX;
    char		buf[256];
    uint		i;

    object = GfuiScreen->hasFocus;
    if (object->state == GFUI_DISABLE) {
	return;
    }
    
    if (mouse == 2) { /* enter key */
	gfuiSelectNext(GfuiScreen);
    } else if (mouse == 0) { /* mouse down */
	editbox = &(object->u.editbox);
	label = &(editbox->label);
	/* Set the cursor position */
	relX = GfuiMouse.X - label->x;
	for (i = 0; i < strlen(label->text); i++){
	    buf[i] = label->text[i];
	    buf[i+1] = '\0';
	    if (relX < label->font->getWidth((const char *)buf)) {
		break;
	    }
	}
	editbox->cursorIdx = i;
	if (i == 0) {
	    editbox->cursorx = label->x;
	} else {
	    buf[i] = '\0';
	    editbox->cursorx = label->x + label->font->getWidth((const char *)buf);
	}
    }
}

/* recalc cursorx with cursorIdx */
static void
gfuiEditboxRecalcCursor(tGfuiObject *obj)
{
    char		buf[256];
    tGfuiEditbox	*editbox;
    tGfuiLabel		*label;

    editbox = &(obj->u.editbox);
    label = &(editbox->label);
    strncpy(buf, label->text, editbox->cursorIdx);
    buf[editbox->cursorIdx] = '\0';
    editbox->cursorx = label->x + label->font->getWidth((const char *)buf);
}


void
gfuiEditboxKey(tGfuiObject *obj, int key, int modifier)
{
    tGfuiEditbox	*editbox;
    tGfuiLabel		*label;
    char		*p1, *p2;
    int			i1, i2;

    if (obj->state == GFUI_DISABLE) {
	return;
    }

    editbox = &(obj->u.editbox);
    label = &(editbox->label);

    switch (modifier) {
    case 0:
    case GLUT_ACTIVE_SHIFT:
	switch (key) {
	case 256 + GLUT_KEY_RIGHT:
	    editbox->cursorIdx++;
	    if (editbox->cursorIdx > (int)strlen(label->text)) {
		editbox->cursorIdx--;
	    }
	    break;
	case 256 + GLUT_KEY_LEFT:
	    editbox->cursorIdx--;
	    if (editbox->cursorIdx < 0) {
		editbox->cursorIdx = 0;
	    }
	    break;
	case 256 + GLUT_KEY_HOME:
	    editbox->cursorIdx = 0;
	    break;
	case 256 + GLUT_KEY_END:
	    editbox->cursorIdx = (int)strlen(label->text);
	    break;
	case 0x7F : /* DEL */
	    if (editbox->cursorIdx < (int)strlen(label->text)) {
		p1 = &(label->text[editbox->cursorIdx]);
		p2 = &(label->text[editbox->cursorIdx+1]);
		while ( *p1 != '\0' ) {
		    *p1++ = *p2++;
		}
	    }
	    break;
	case '\b' : /* Backspace */
	    if (editbox->cursorIdx > 0) {
		p1 = &(label->text[editbox->cursorIdx-1]);
		p2 = &(label->text[editbox->cursorIdx]);
		while ( *p1 != '\0' ) {
		    *p1++ = *p2++;
		}
		editbox->cursorIdx--;
	    }
	    break;	
	}
	if (key >= ' ' && key < 127) {
	    if ((int)strlen(label->text) < label->maxlen) {
		i2 = (int)strlen(label->text) + 1;
		i1 = i2 - 1;
		while (i2 > editbox->cursorIdx) {
		    label->text[i2] = label->text[i1];
		    i1--;
		    i2--;
		}
		label->text[editbox->cursorIdx] = key;
		editbox->cursorIdx++;
	    }
	}
	break;
	
    case GLUT_ACTIVE_CTRL:
	break;

    case GLUT_ACTIVE_ALT:
	break;
    }

    gfuiEditboxRecalcCursor(obj);
}

/** Get the string
    @ingroup	gui
     @param	scr		Screen
    @param	id		Edit box Id
    @return	Corresponding string.
 */
char *
GfuiEditboxGetString(void *scr, int id)
{
    tGfuiObject		*curObject;
    tGfuiEditbox	*editbox;
    tGfuiLabel		*label;
    
    curObject = gfuiGetObject(scr, id);
    
    if ((curObject == NULL) || (curObject->widget != GFUI_EDITBOX)) {
	return (char*)NULL;
    }

    editbox = &(curObject->u.editbox);
    label = &(editbox->label);
    
    return label->text;
}

/** Set a new string.
    @ingroup	gui
    @param	scr		Screen
    @param	id		Edit box Id
    @param	text		text to set
    @return	none
 */
void GfuiEditboxSetString(void *scr, int id, char *text)
{
    tGfuiObject		*curObject;
    tGfuiEditbox	*editbox;
    tGfuiLabel		*label;
    
    curObject = gfuiGetObject(scr, id);
    
    if ((curObject == NULL) || (curObject->widget != GFUI_EDITBOX)) {
	return;
    }

    editbox = &(curObject->u.editbox);
    label = &(editbox->label);

    strncpy(label->text, text, label->maxlen);
}


void
gfuiReleaseEditbox(tGfuiObject *curObject)
{
    tGfuiEditbox	*editbox;
    tGfuiLabel		*label;

    editbox = &(curObject->u.editbox);
    label = &(editbox->label);
    free(label->text);
    free(curObject);
}