/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.android.internal.view.menu;

import android.content.Context;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.view.ViewGroup;
import android.widget.ImageButton;
import android.widget.LinearLayout;

import java.util.ArrayList;

/**
 * @hide
 */
public class ActionMenuView extends LinearLayout implements MenuBuilder.ItemInvoker, MenuView {
    private static final String TAG = "ActionMenuView";
    
    private MenuBuilder mMenu;

    private int mItemPadding;
    private int mItemMargin;
    private int mMaxItems;
    private boolean mReserveOverflow;
    private OverflowMenuButton mOverflowButton;
    
    public ActionMenuView(Context context) {
        this(context, null);
    }
    
    public ActionMenuView(Context context, AttributeSet attrs) {
        super(context, attrs);
        
        TypedArray a = context.obtainStyledAttributes(attrs,
                com.android.internal.R.styleable.Theme);
        mItemPadding = a.getDimensionPixelOffset(
                com.android.internal.R.styleable.Theme_actionButtonPadding, 0);
        mItemMargin = mItemPadding / 2;
        a.recycle();
        
        final Resources res = getResources();
        final int size = res.getDimensionPixelSize(com.android.internal.R.dimen.action_icon_size);
        final int spaceAvailable = res.getDisplayMetrics().widthPixels / 2;
        final int itemSpace = size + mItemPadding;
        
        mMaxItems = spaceAvailable / (itemSpace > 0 ? itemSpace : 1);

        // TODO There has to be a better way to indicate that we don't have a hard menu key.
        final int screen = res.getConfiguration().screenLayout;
        mReserveOverflow = (screen & Configuration.SCREENLAYOUT_SIZE_MASK) ==
                Configuration.SCREENLAYOUT_SIZE_XLARGE;
    }

    public boolean isOverflowReserved() {
        return mReserveOverflow;
    }
    
    public void setOverflowReserved(boolean reserveOverflow) {
        mReserveOverflow = reserveOverflow;
    }

    @Override
    protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
        if (p instanceof LayoutParams) {
            LayoutParams lp = (LayoutParams) p;
            return lp.leftMargin == mItemMargin && lp.rightMargin == mItemMargin &&
                    lp.width == LayoutParams.WRAP_CONTENT && lp.height == LayoutParams.WRAP_CONTENT;
        }
        return false;
    }
    
    @Override
    protected LayoutParams generateDefaultLayoutParams() {
        LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT,
                LayoutParams.WRAP_CONTENT);
        params.leftMargin = mItemMargin;
        params.rightMargin = mItemMargin;
        return params;
    }
    
    @Override
    protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
        return generateDefaultLayoutParams();
    }
    
    public int getItemMargin() {
        return mItemMargin;
    }

    public boolean invokeItem(MenuItemImpl item) {
        return mMenu.performItemAction(item, 0);
    }

    public int getWindowAnimations() {
        return 0;
    }

    public void initialize(MenuBuilder menu, int menuType) {
        menu.setMaxActionItems(mMaxItems);
        mMenu = menu;
        updateChildren(true);
    }

    public void updateChildren(boolean cleared) {
        final boolean reserveOverflow = mReserveOverflow;
        removeAllViews();
        
        final ArrayList<MenuItemImpl> itemsToShow = mMenu.getActionItems(reserveOverflow);
        final int itemCount = itemsToShow.size();
        
        for (int i = 0; i < itemCount; i++) {
            final MenuItemImpl itemData = itemsToShow.get(i);
            addItemView((ActionMenuItemView) itemData.getItemView(MenuBuilder.TYPE_ACTION_BUTTON,
                    this));
        }

        if (reserveOverflow) {
            if (mMenu.getNonActionItems(true).size() > 0) {
                OverflowMenuButton button = new OverflowMenuButton(mContext);
                addView(button);
                mOverflowButton = button;
            } else {
                mOverflowButton = null;
            }
        }
    }

    public boolean showOverflowMenu() {
        if (mOverflowButton != null) {
            MenuPopupHelper popup = new MenuPopupHelper(getContext(), mMenu, mOverflowButton, true);
            popup.show();
            return true;
        }
        return false;
    }

    private void addItemView(ActionMenuItemView view) {
        view.setItemInvoker(this);
        addView(view);
    }

    private class OverflowMenuButton extends ImageButton {
        public OverflowMenuButton(Context context) {
            super(context, null, com.android.internal.R.attr.actionButtonStyle);

            final Resources res = context.getResources();
            setClickable(true);
            setFocusable(true);
            // TODO setTitle() to a localized string for accessibility
            setImageDrawable(res.getDrawable(com.android.internal.R.drawable.ic_menu_more));
            setVisibility(VISIBLE);
            setEnabled(true);
        }

        @Override
        public boolean performClick() {
            if (super.performClick()) {
                return true;
            }

            showOverflowMenu();
            return true;
        }
    }
}