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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 <stdarg.h>

#include "menu.h"
#include "button.h"
#include "toolkit.h"
#include "stock.h"
#include "container.h"
#include "../common/context.h"
#include "../ui/window.h"

#include <cx/linked_list.h>
#include <cx/array_list.h>

static ui_menu_add_f createMenuItem[] = {
    /* UI_MENU                 */ add_menu_widget,
    /* UI_MENU_SUBMENU         */ add_menu_widget,
    /* UI_MENU_ITEM            */ add_menuitem_widget,
    /* UI_MENU_STOCK_ITEM      */ add_menuitem_st_widget,
    /* UI_MENU_CHECK_ITEM      */ add_checkitem_widget,
    /* UI_MENU_CHECK_ITEM_NV   */ add_checkitemnv_widget,
    /* UI_MENU_ITEM_LIST       */ add_menuitem_list_widget,
    /* UI_MENU_ITEM_LIST_NV    */ NULL, // TODO
    /* UI_MENU_SEPARATOR       */ add_menuseparator_widget
};

// private menu functions
void ui_create_menubar(UiObject *obj) {
    UiMenu *menus = uic_get_menu_list();
    if(!menus) {
        return;
    }
    
    Widget menubar = XmCreateMenuBar(obj->widget, "main_list", NULL, 0);
    XtManageChild(menubar);
    
    UiMenu *menu = menus;
    int menu_index = 0;
    while(menu) {
        menu_index += add_menu_widget(menubar, menu_index, &menu->item, obj);
        
        menu = (UiMenu*)menu->item.next;
    }
}

int add_menu_widget(Widget parent, int i, UiMenuItemI *item, UiObject *obj) {
    UiMenu *menu = (UiMenu*)item;
    
    Widget menuItem = XtVaCreateManagedWidget(
            menu->label,
            xmCascadeButtonWidgetClass,
            parent,
            NULL);
    Widget m = XmVaCreateSimplePulldownMenu(parent, menu->label, i, NULL, NULL);
    
    UiMenuItemI *mi = menu->items_begin;
    int menu_index = 0;
    while(mi) {
        menu_index += createMenuItem[mi->type](m, menu_index, mi, obj);
        mi = mi->next;
    }
    
    return 1;
}

int add_menuitem_widget(
        Widget parent,
        int i,
        UiMenuItemI *item,
        UiObject *obj)
{
    UiMenuItem *mi = (UiMenuItem*)item;
    
    Arg args[1];
    XmString label = XmStringCreateLocalized(mi->label);
    XtSetArg(args[0], XmNlabelString, label);
    
    Widget mitem = XtCreateManagedWidget(
            "menubutton",
            xmPushButtonWidgetClass,
            parent,
            args,
            1);
    XmStringFree(label);
    
    if(mi->callback != NULL) {
        UiEventData *event = cxMalloc(
                obj->ctx->allocator,
                sizeof(UiEventData));
        event->obj = obj;
        event->userdata = mi->userdata;
        event->callback = mi->callback;
        event->value = 0;
        XtAddCallback(
                mitem,
                XmNactivateCallback,
                (XtCallbackProc)ui_push_button_callback,
                event);
    }
    
    if(mi->groups) {
        uic_add_group_widget(obj->ctx, mitem, (ui_enablefunc)XtSetSensitive, mi->groups);
    }
    
    return 1;
}

int add_menuitem_st_widget(Widget parent, int i, UiMenuItemI *item, UiObject *obj) {
    UiStMenuItem *mi = (UiStMenuItem*)item;
    
    UiStockItem *si = ui_get_stock_item(mi->stockid);
    if(!si) {
        fprintf(stderr, "UI Error: unknown stock id: %s\n", mi->stockid);
        return 0;
    }
    
    int n = 0;
    Arg args[4];
    XmString label = XmStringCreateLocalized(si->label);
    XmString at = NULL;
    
    XtSetArg(args[n], XmNlabelString, label);
    n++;
    if(si->accelerator) {
        XtSetArg(args[n], XmNaccelerator, si->accelerator);
        n++;
    }
    if(si->accelerator_label) {
        at = XmStringCreateLocalized(si->accelerator_label);
        XtSetArg(args[n], XmNacceleratorText, at);
        n++;
    }
    
    Widget mitem = XtCreateManagedWidget(
            "menubutton",
            xmPushButtonWidgetClass,
            parent,
            args,
            n);
    XmStringFree(label);
    if(at) {
        XmStringFree(at);
    }
    
    if(mi->callback != NULL) {
        UiEventData *event = cxMalloc(
                obj->ctx->allocator,
                sizeof(UiEventData));
        event->obj = obj;
        event->userdata = mi->userdata;
        event->callback = mi->callback;
        event->value = 0;
        XtAddCallback(
                mitem,
                XmNactivateCallback,
                (XtCallbackProc)ui_push_button_callback,
                event);
    }
    
    if(mi->groups) {
        uic_add_group_widget(obj->ctx, mitem, (ui_enablefunc)XtSetSensitive, mi->groups);
    }
    
    return 1;
}

int add_menuseparator_widget(
        Widget parent,
        int i,
        UiMenuItemI *item,
        UiObject *obj)
{
    Widget s = XmCreateSeparatorGadget (parent, "menu_separator", NULL, 0);
    XtManageChild(s);
    return 1;
}

int add_checkitem_widget(
        Widget parent,
        int i,
        UiMenuItemI *item,
        UiObject *obj)
{
    UiCheckItem *ci = (UiCheckItem*)item;
    
    Arg args[3];
    XmString label = XmStringCreateLocalized(ci->label);
    XtSetArg(args[0], XmNlabelString, label);
    XtSetArg(args[1], XmNvisibleWhenOff, 1);
    Widget checkbox = XtCreateManagedWidget(
            "menutogglebutton",
            xmToggleButtonWidgetClass,
            parent,
            args,
            2);
    XmStringFree(label);
    
    if(ci->callback) {
        UiEventData *event = cxMalloc(
                obj->ctx->allocator,
                sizeof(UiEventData));
        event->obj = obj;
        event->userdata = ci->userdata;
        event->callback = ci->callback;
        XtAddCallback(
            checkbox,
            XmNvalueChangedCallback,
            (XtCallbackProc)ui_toggle_button_callback,
            event);
    }
    
    return 1;
}

int add_checkitemnv_widget(
        Widget parent,
        int i,
        UiMenuItemI *item,
        UiObject *obj)
{
    UiCheckItemNV *ci = (UiCheckItemNV*)item;
    
    Arg args[3];
    XmString label = XmStringCreateLocalized(ci->label);
    XtSetArg(args[0], XmNlabelString, label);
    XtSetArg(args[1], XmNvisibleWhenOff, 1);
    Widget checkbox = XtCreateManagedWidget(
            "menutogglebutton",
            xmToggleButtonWidgetClass,
            parent,
            args,
            2);
    XmStringFree(label);
    
    UiVar *var = uic_create_var(obj->ctx, ci->varname, UI_VAR_INTEGER);
    if(var) {
        UiInteger *value = var->value;
        value->obj = checkbox;
        value->get = ui_toggle_button_get;
        value->set = ui_toggle_button_set;
        value = 0;
    } else {
        // TODO: error
    }
    
    return 1;
}

int add_menuitem_list_widget(
        Widget parent,
        int i,
        UiMenuItemI *item,
        UiObject *obj)
{
    UiMenuItemList *il = (UiMenuItemList*)item;
    
    UiActiveMenuItemList *ls = cxMalloc(
            obj->ctx->allocator,
            sizeof(UiActiveMenuItemList));
    
    ls->object = obj;
    ls->menu = parent;
    ls->index = i;
    ls->oldcount = 0;
    ls->list = il->list;
    ls->callback = il->callback;
    ls->userdata = il->userdata;
    
    ls->list->observers = ui_add_observer(
            ls->list->observers,
            (ui_callback)ui_update_menuitem_list,
            ls);
    
    ui_update_menuitem_list(NULL, ls);
    
    return 0;
}

void ui_update_menuitem_list(UiEvent *event, UiActiveMenuItemList *list) {
    Arg args[4];
    
    // remove old items
    if(list->oldcount > 0) {
        Widget *children;
        int nc;
        
        XtVaGetValues(
                list->menu,
                XmNchildren,
                &children,
                XmNnumChildren,
                &nc,
                NULL);
        
        for(int i=0;i<list->oldcount;i++) {
            XtDestroyWidget(children[list->index + i]);
        }
    }
    
    char *str = ui_list_first(list->list);
    if(str) {
        // add separator
        XtSetArg(args[0], XmNpositionIndex, list->index);
        Widget s = XmCreateSeparatorGadget (list->menu, "menu_separator", args, 1);
        XtManageChild(s);
    }
    int i = 1;
    while(str) {
        XmString label = XmStringCreateLocalized(str);
        XtSetArg(args[0], XmNlabelString, label);
        XtSetArg(args[1], XmNpositionIndex, list->index + i);

        Widget mitem = XtCreateManagedWidget(
                "menubutton",
                xmPushButtonWidgetClass,
                list->menu,
                args,
                2);
        XmStringFree(label);
        
        if(list->callback) {
            // TODO: use mempool
            UiEventData *event = malloc(sizeof(UiEventData));
            event->obj = list->object;
            event->userdata = list->userdata;
            event->callback = list->callback;
            event->value = i - 1;

            XtAddCallback(
                mitem,
                XmNactivateCallback,
                (XtCallbackProc)ui_push_button_callback,
                event);
        }
        
        str = ui_list_next(list->list);
        i++;
    }
    
    list->oldcount = i;
}

void ui_menu_event_wrapper(Widget widget, XtPointer udata, XtPointer cdata) {
    UiEventData *event = udata;
    UiEvent e;
    e.obj = event->obj;
    e.window = event->obj->window;
    e.document = event->obj->ctx->document;
    e.intval = 0;
    event->callback(&e, event->userdata);    
}


/*
 * widget menu functions
 */

static void ui_popup_handler(Widget widget, XtPointer data,  XEvent *event, Boolean *c) {
    Widget menu = data;
    XmMenuPosition(menu, (XButtonPressedEvent *)event);
    XtManageChild(menu);
    
    *c = FALSE;
}

UIMENU ui_contextmenu(UiObject *obj) {
    UiContainer *ct = uic_get_current_container(obj);
    if(ct->current) {
        return ui_contextmenu_w(obj, ct->current);
    } else {
        return NULL; // TODO: warn
    }
}

UIMENU ui_contextmenu_w(UiObject *obj, UIWIDGET widget) {
    UiContainer *ct = uic_get_current_container(obj);
    
    Widget menu = XmCreatePopupMenu(widget, "popup_menu", NULL, 0);
    ct->menu = menu;
    
    XtAddEventHandler(widget, ButtonPressMask, FALSE, ui_popup_handler, menu);
    
    return menu;
}

void ui_contextmenu_popup(UIMENU menu) {
    
}

void ui_widget_menuitem(UiObject *obj, char *label, ui_callback f, void *userdata) {
    ui_widget_menuitem_gr(obj, label, f, userdata, -1);
}

void ui_widget_menuitem_gr(UiObject *obj, char *label, ui_callback f, void *userdata, ...) {
    UiContainer *ct = uic_get_current_container(obj);
    if(!ct->menu) {
        return;
    }
    
    // add groups
    CxList *groups = NULL;
    va_list ap;
    va_start(ap, userdata);
    int group;
    while((group = va_arg(ap, int)) != -1) {
        if(!groups) {
            groups = cxArrayListCreate(cxDefaultAllocator, NULL, sizeof(int), 16);
        }
        cxListAdd(groups, &group);
    }
    va_end(ap);
    
    // create menuitem
    Arg args[4];
    XmString labelstr = XmStringCreateLocalized(label);
    XtSetArg(args[0], XmNlabelString, labelstr);
    
    Widget item = XmCreatePushButton(ct->menu, "menu_button", args, 1);
    XtManageChild(item);
    XmStringFree(labelstr);
}

void ui_widget_menuitem_st(UiObject *obj, char *stockid, ui_callback f, void *userdata) {
    ui_widget_menuitem_stgr(obj, stockid, f, userdata, -1);
}

void ui_widget_menuitem_stgr(UiObject *obj, char *stockid, ui_callback f, void *userdata, ...) {
    UiContainer *ct = uic_get_current_container(obj);
    if(!ct->menu) {
        return;
    }
    
    // add groups
    CxList *groups = NULL;
    va_list ap;
    va_start(ap, userdata);
    int group;
    while((group = va_arg(ap, int)) != -1) {
        if(!groups) {
            groups = cxArrayListCreate(cxDefaultAllocator, NULL, sizeof(int), 16);
        }
        cxListAdd(groups, &group);
    }
    va_end(ap);
    
    // create menuitem
    UiStockItem *stockItem = ui_get_stock_item(stockid);
    Arg args[4];
    XmString labelstr = XmStringCreateLocalized(stockItem->label);
    XtSetArg(args[0], XmNlabelString, labelstr);
    
    Widget item = XmCreatePushButton(ct->menu, "menu_button", args, 1);
    XtManageChild(item);
    XmStringFree(labelstr);
}