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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2014 Olaf Wintermann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdio.h>
#include <stdlib.h>

#include "button.h"
#include "container.h"
#include "../common/context.h"
#include <ucx/mempool.h>


UIWIDGET ui_button(UiObject *obj, char *label, ui_callback f, void *data) {
    UiContainer *ct = uic_get_current_container(obj);
    XmString str = XmStringCreateLocalized(label);
    
    int n = 0;
    Arg args[16];
    
    XtSetArg(args[n], XmNlabelString, str);
    n++;
    
    Widget parent = ct->prepare(ct, args, &n, FALSE);
    Widget button = XmCreatePushButton(parent, "button", args, n);
    ct->add(ct, button);
    
    if(f) {
        UiEventData *event = ucx_mempool_malloc(
                obj->ctx->mempool,
                sizeof(UiEventData));
        event->obj = obj;
        event->userdata = data;
        event->callback = f;
        event->value = 0;
        XtAddCallback(
                button,
                XmNactivateCallback,
                (XtCallbackProc)ui_push_button_callback,
                event);
    }
    
    XtManageChild(button);
    
    return button;
}

// wrapper
int64_t ui_toggle_button_get(UiInteger *i) {
    int state = 0;
    XtVaGetValues(i->obj, XmNset, &state, NULL);
    i->value = state;
    return state;
}

void ui_toggle_button_set(UiInteger *i, int64_t value) {
    Arg arg;
    XtSetArg(arg, XmNset, value);
    XtSetValues(i->obj, &arg, 1);
    i->value = value;
}

void ui_toggle_button_callback(
        Widget widget,
        UiEventData *event,
        XmToggleButtonCallbackStruct *tb)
{
    UiEvent e;
    e.obj = event->obj;
    e.window = event->obj->window;
    // TODO: e.document
    e.intval = tb->set;
    event->callback(&e, event->userdata); 
}

void ui_push_button_callback(Widget widget, UiEventData *event, XtPointer d) {
    UiEvent e;
    e.obj = event->obj;
    e.window = event->obj->window;
    e.document = event->obj->ctx->document;
    e.intval = event->value;
    event->callback(&e, event->userdata);
}


static void radio_callback(
        Widget widget,
        RadioEventData *event,
        XmToggleButtonCallbackStruct *tb)
{
    if(tb->set) {
        RadioButtonGroup *group = event->group;
        if(group->current) {
            Arg arg;
            XtSetArg(arg, XmNset, FALSE);
            XtSetValues(group->current, &arg, 1);
        }
        group->current = widget;
    }
}

UIWIDGET ui_radiobutton(UiObject *obj, char *label, UiInteger *rgroup) {
    UiContainer *ct = uic_get_current_container(obj);
    XmString str = XmStringCreateLocalized(label);
    
    int n = 0;
    Arg args[16];
    
    XtSetArg(args[n], XmNlabelString, str);
    n++;
    XtSetArg(args[n], XmNindicatorType, XmONE_OF_MANY_ROUND);
    n++;
    
    Widget parent = ct->prepare(ct, args, &n, FALSE);
    Widget button = XmCreateToggleButton(parent, "radiobutton", args, n);
    ct->add(ct, button);
    
    if(rgroup) {
        RadioButtonGroup *group;
        if(rgroup->obj) {
            group = rgroup->obj;
            group->buttons = ucx_list_append(group->buttons, button);
            group->ref++;
        } else {
            group = malloc(sizeof(RadioButtonGroup));
            group->buttons = ucx_list_append(NULL, button);
            group->current = button;
            // this is the first button in the radiobutton group
            // so we should enable it
            Arg arg;
            XtSetArg(arg, XmNset, TRUE);
            XtSetValues(button, &arg, 1);
            rgroup->obj = group;
            
            group->current = button;
        }
        
        RadioEventData *event = malloc(sizeof(RadioEventData));
        event->obj = obj;
        event->callback = NULL;
        event->userdata = NULL;
        event->group = group;
        XtAddCallback(
            button,
            XmNvalueChangedCallback,
            (XtCallbackProc)radio_callback,
            event);
        
        rgroup->get = ui_radiobutton_get;
        rgroup->set = ui_radiobutton_set;
    }
    
    XtManageChild(button); 
    return button;
}

int64_t ui_radiobutton_get(UiInteger *value) {
    RadioButtonGroup *group = value->obj;
    
    int i = ucx_list_find(group->buttons, group->current, NULL, NULL);
    if (i >= 0) {
        value->value = i;
        return i;
    } else {
        return 0;
    }
}

void ui_radiobutton_set(UiInteger *value, int64_t i) {
    RadioButtonGroup *group = value->obj;
    Arg arg;
    
    XtSetArg(arg, XmNset, FALSE);
    XtSetValues(group->current, &arg, 1);
    
    UcxList *elm = ucx_list_get(group->buttons, i);
    if(elm) {
        Widget button = elm->data;
        XtSetArg(arg, XmNset, TRUE);
        XtSetValues(button, &arg, 1);
        group->current = button;
    }
}