/*
 * 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 "container.h"

#include "list.h"
#include "../common/object.h"


void* ui_strmodel_getvalue(void *elm, int column) {
    return column == 0 ? elm : NULL;
}


UIWIDGET ui_listview_str(UiObject *obj, UiList *list, ui_callback f, void *udata) {
    return ui_listview(obj, list, ui_strmodel_getvalue, f, udata);
}

UIWIDGET ui_listview_var(UiObject *obj, UiVar *var, ui_getvaluefunc getvalue, ui_callback f, void *udata) {
    int count;
    XmStringTable items = ui_create_stringlist(var->value, getvalue, &count);
    
    Arg args[8];
    int n = 0;
    XtSetArg(args[n], XmNitemCount, count);
    n++;
    XtSetArg(args[n], XmNitems, count == 0 ? NULL : items);
    n++;
    
    UiContainer *ct = uic_get_current_container(obj);
    Widget parent = ct->prepare(ct, args, &n, TRUE);
    Widget widget = XmCreateScrolledList(parent, "listview", args, n);
    ct->add(ct, XtParent(widget));
    XtManageChild(widget);
    
    UiListView *listview = ucx_mempool_malloc(obj->ctx->mempool, sizeof(UiListView));
    listview->widget = widget;
    listview->list = var;
    listview->getvalue = getvalue;
    
    for (int i=0;i<count;i++) {
        XmStringFree(items[i]);
    }
    XtFree((char *)items);
    
    if(f) {
        UiListViewEventData *event = ucx_mempool_malloc(
                obj->ctx->mempool,
                sizeof(UiListViewEventData));
        event->event.obj = obj;
        event->event.userdata = udata;
        event->event.callback = f;
        event->event.value = 0;
        event->var = var;
        XtAddCallback(
                widget,
                XmNdefaultActionCallback,
                (XtCallbackProc)ui_list_selection_callback,
                event);
    }
    
    return widget;
}

UIWIDGET ui_listview(UiObject *obj, UiList *list, ui_getvaluefunc getvalue, ui_callback f, void *udata) {
    UiVar *var = malloc(sizeof(UiVar));
    var->value = list;
    var->type = UI_VAR_SPECIAL;
    return ui_listview_var(obj, var, getvalue, f, udata);
}

UIWIDGET ui_listview_nv(UiObject *obj, char *varname, ui_getvaluefunc getvalue, ui_callback f, void *udata) {
    UiVar *var = uic_create_var(obj->ctx, varname, UI_VAR_LIST);
    if(var) {
        UiListVar *value = var->value;
        return ui_listview_var(obj, var, getvalue, f, udata);
    } else {
        // TODO: error
    }
    return NULL;
}


XmStringTable ui_create_stringlist(UiList *list, ui_getvaluefunc getvalue, int *count) { 
    int num = list->count(list);
    XmStringTable items = (XmStringTable)XtMalloc(num * sizeof(XmString));
    void *data = list->first(list);
    for(int i=0;i<num;i++) {
        items[i] = XmStringCreateLocalized(getvalue(data, 0));
        data = list->next(list);
    }
    
    *count = num;
    return items;
}


void ui_listview_update(UiEvent *event, UiListView *view) {
    int count;
    XmStringTable items = ui_create_stringlist(
            view->list->value,
            view->getvalue,
            &count);
    
    XtVaSetValues(
            view->widget,
            XmNitems, count == 0 ? NULL : items,
            XmNitemCount,
            count,
            NULL);
    
    for (int i=0;i<count;i++) {
        XmStringFree(items[i]);
    }
    XtFree((char *)items);
}

void ui_list_selection_callback (Widget widget, UiListViewEventData *event, XtPointer data) {
    XmListCallbackStruct *cbs = (XmListCallbackStruct *)data;
    
    UiEvent e;
    e.obj = event->event.obj;
    e.window = event->event.obj->window;
    e.document = event->event.obj->ctx->document;
    UiList *list = event->var->value;
    e.eventdata = list->get(list, cbs->item_position - 1);
    e.intval = cbs->item_position - 1;
    event->event.callback(&e, event->event.userdata);
}


/* --------------------------- ComboBox ---------------------------  */

UIWIDGET ui_combobox_str(UiObject *obj, UiList *list, ui_callback f, void *udata) {
    return ui_combobox(obj, list, ui_strmodel_getvalue, f, udata);
}

UIWIDGET ui_combobox(UiObject *obj, UiList *list, ui_getvaluefunc getvalue, ui_callback f, void *udata) {
    UiVar *var = malloc(sizeof(UiVar));
    var->value = list;
    var->type = UI_VAR_SPECIAL;
    return ui_combobox_var(obj, var, getvalue, f, udata);
}

UIWIDGET ui_combobox_nv(UiObject *obj, char *varname, ui_getvaluefunc getvalue, ui_callback f, void *udata) {
    UiVar *var = uic_create_var(obj->ctx, varname, UI_VAR_LIST);
    if(var) {
        UiListVar *value = var->value;
        return ui_combobox_var(obj, var, getvalue, f, udata);
    } else {
        // TODO: error
    }
    return NULL;
}

UIWIDGET ui_combobox_var(UiObject *obj, UiVar *var, ui_getvaluefunc getvalue, ui_callback f, void *udata) {
    UiListView *listview = ucx_mempool_malloc(
                obj->ctx->mempool,
                sizeof(UiListView));
    
    UiContainer *ct = uic_get_current_container(obj);
    Arg args[16];
    int n = 0;
    XtSetArg(args[n], XmNindicatorOn, XmINDICATOR_NONE);
    n++;
    XtSetArg(args[n], XmNtraversalOn, FALSE);
    n++;
    XtSetArg(args[n], XmNwidth, 160);
    n++;
    Widget parent = ct->prepare(ct, args, &n, FALSE);
    Widget combobox = XmCreateDropDownList(parent, "combobox", args, n);
    XtManageChild(combobox);
    listview->widget = combobox;
    listview->list = var;
    listview->getvalue = getvalue;
    
    ui_listview_update(NULL, listview);
    
}