/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

package org.mozilla.gecko.toolbar;

import java.util.Arrays;

import android.support.v4.content.ContextCompat;
import org.mozilla.gecko.R;
import org.mozilla.gecko.Tab;
import org.mozilla.gecko.Tabs;
import org.mozilla.gecko.tabs.TabHistoryController;
import org.mozilla.gecko.menu.MenuItemActionBar;
import org.mozilla.gecko.util.HardwareUtils;
import org.mozilla.gecko.widget.themed.ThemedTextView;

import android.content.Context;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffColorFilter;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.LinearLayout;

/**
 * A base implementations of the browser toolbar for tablets.
 * This class manages any Views, variables, etc. that are exclusive to tablet.
 */
abstract class BrowserToolbarTabletBase extends BrowserToolbar {

    protected enum ForwardButtonAnimation {
        SHOW,
        HIDE
    }

    protected final LinearLayout actionItemBar;

    protected final BackButton backButton;
    protected final ForwardButton forwardButton;

    protected final View menuButtonMarginView;

    private final PorterDuffColorFilter privateBrowsingTabletMenuItemColorFilter;

    protected abstract void animateForwardButton(ForwardButtonAnimation animation);

    public BrowserToolbarTabletBase(final Context context, final AttributeSet attrs) {
        super(context, attrs);

        actionItemBar = (LinearLayout) findViewById(R.id.menu_items);

        backButton = (BackButton) findViewById(R.id.back);
        backButton.setEnabled(false);
        forwardButton = (ForwardButton) findViewById(R.id.forward);
        forwardButton.setEnabled(false);
        initButtonListeners();

        focusOrder.addAll(Arrays.asList(tabsButton, (View) backButton, (View) forwardButton, this));
        focusOrder.addAll(urlDisplayLayout.getFocusOrder());
        focusOrder.addAll(Arrays.asList(actionItemBar, menuButton));

        urlDisplayLayout.updateSiteIdentityAnchor(backButton);

        privateBrowsingTabletMenuItemColorFilter = new PorterDuffColorFilter(
                ContextCompat.getColor(context, R.color.tabs_tray_icon_grey), PorterDuff.Mode.SRC_IN);

        menuButtonMarginView = findViewById(R.id.menu_margin);
        if (menuButtonMarginView != null) {
            menuButtonMarginView.setVisibility(View.VISIBLE);
        }
    }

    private void initButtonListeners() {
        backButton.setOnClickListener(new Button.OnClickListener() {
            @Override
            public void onClick(View view) {
                Tabs.getInstance().getSelectedTab().doBack();
            }
        });
        backButton.setOnLongClickListener(new Button.OnLongClickListener() {
            @Override
            public boolean onLongClick(View view) {
                return tabHistoryController.showTabHistory(Tabs.getInstance().getSelectedTab(),
                        TabHistoryController.HistoryAction.BACK);
            }
        });

        forwardButton.setOnClickListener(new Button.OnClickListener() {
            @Override
            public void onClick(View view) {
                Tabs.getInstance().getSelectedTab().doForward();
            }
        });
        forwardButton.setOnLongClickListener(new Button.OnLongClickListener() {
            @Override
            public boolean onLongClick(View view) {
                return tabHistoryController.showTabHistory(Tabs.getInstance().getSelectedTab(),
                        TabHistoryController.HistoryAction.FORWARD);
            }
        });
    }

    @Override
    protected boolean isTabsButtonOffscreen() {
        return false;
    }

    @Override
    public boolean addActionItem(final View actionItem) {
        actionItemBar.addView(actionItem, LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT);
        return true;
    }

    @Override
    public void removeActionItem(final View actionItem) {
        actionItemBar.removeView(actionItem);
    }

    @Override
    protected void updateNavigationButtons(final Tab tab) {
        backButton.setEnabled(canDoBack(tab));
        animateForwardButton(
                canDoForward(tab) ? ForwardButtonAnimation.SHOW : ForwardButtonAnimation.HIDE);
    }

    @Override
    public void setNextFocusDownId(int nextId) {
        super.setNextFocusDownId(nextId);
        backButton.setNextFocusDownId(nextId);
        forwardButton.setNextFocusDownId(nextId);
    }

    @Override
    public void setPrivateMode(final boolean isPrivate) {
        super.setPrivateMode(isPrivate);

        // If we had backgroundTintList, we could remove the colorFilter
        // code in favor of setPrivateMode (bug 1197432).
        final PorterDuffColorFilter colorFilter =
                isPrivate ? privateBrowsingTabletMenuItemColorFilter : null;
        setTabsCounterPrivateMode(isPrivate, colorFilter);

        backButton.setPrivateMode(isPrivate);
        forwardButton.setPrivateMode(isPrivate);
        menuIcon.setPrivateMode(isPrivate);
        for (int i = 0; i < actionItemBar.getChildCount(); ++i) {
            final MenuItemActionBar child = (MenuItemActionBar) actionItemBar.getChildAt(i);
            child.setPrivateMode(isPrivate);
        }
    }

    private void setTabsCounterPrivateMode(final boolean isPrivate, final PorterDuffColorFilter colorFilter) {
        // The TabsCounter is a TextSwitcher which cycles two views
        // to provide animations, hence looping over these two children.
        for (int i = 0; i < 2; ++i) {
            final ThemedTextView view = (ThemedTextView) tabsCounter.getChildAt(i);
            view.setPrivateMode(isPrivate);
            view.getBackground().mutate().setColorFilter(colorFilter);
        }

        // To prevent animation of the background,
        // it is set to a different Drawable.
        tabsCounter.getBackground().mutate().setColorFilter(colorFilter);
    }

    @Override
    public View getDoorHangerAnchor() {
        return backButton;
    }

    protected boolean canDoBack(final Tab tab) {
        return (tab.canDoBack() && !isEditing());
    }

    protected boolean canDoForward(final Tab tab) {
        return (tab.canDoForward() && !isEditing());
    }
}