/*
 * Copyright (C) 2011 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.browser;

import android.app.Activity;
import android.content.Context;
import android.content.res.Configuration;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.webkit.WebView;
import android.widget.BaseAdapter;
import android.widget.FrameLayout;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.PopupMenu;
import android.widget.PopupMenu.OnMenuItemClickListener;
import android.widget.RelativeLayout;
import android.widget.TextView;

import com.android.browser.NavTabGallery.OnRemoveListener;
import com.android.browser.TabControl.OnThumbnailUpdatedListener;
import com.android.browser.view.Gallery.OnScrollFinishedListener;

import java.util.HashMap;

public class NavScreen extends RelativeLayout
        implements OnClickListener, OnMenuItemClickListener, OnThumbnailUpdatedListener {


    private static final int SCROLL_MIN = 200;
    private static final int SCROLL_FACTOR = 20;

    UiController mUiController;
    PhoneUi mUi;
    Tab mTab;
    Activity mActivity;

    ImageButton mRefresh;
    ImageButton mForward;
    ImageButton mBookmarks;
    ImageButton mMore;
    ImageButton mNewTab;
    FrameLayout mHolder;

    TextView mTitle;
    ImageView mFavicon;
    ImageButton mCloseTab;

    NavTabGallery mScroller;
    TabAdapter mAdapter;
    int mOrientation;
    boolean mNeedsMenu;
    HashMap<Tab, View> mTabViews;

    public NavScreen(Activity activity, UiController ctl, PhoneUi ui) {
        super(activity);
        mActivity = activity;
        mUiController = ctl;
        mUi = ui;
        mOrientation = activity.getResources().getConfiguration().orientation;
        init();
    }

    protected Tab getSelectedTab() {
        return (Tab) mScroller.getSelectedItem();
    }

    protected void showMenu() {
        PopupMenu popup = new PopupMenu(mContext, mMore);
        Menu menu = popup.getMenu();
        popup.getMenuInflater().inflate(R.menu.browser, menu);
        mUiController.updateMenuState(mScroller.getSelectedItem(), menu);
        popup.setOnMenuItemClickListener(this);
        popup.show();
    }

    @Override
    public boolean onMenuItemClick(MenuItem item) {
        mUi.hideNavScreen(false);
        return mUiController.onOptionsItemSelected(item);
    }

    protected float getToolbarHeight() {
        return mActivity.getResources().getDimension(R.dimen.toolbar_height);
    }

    // for configuration changes
    @Override
    protected void onConfigurationChanged(Configuration newconfig) {
        if (newconfig.orientation != mOrientation) {
            int selIx = mScroller.getSelectionIndex();
            removeAllViews();
            mOrientation = newconfig.orientation;
            init();
            mScroller.setSelection(selIx);
            mAdapter.notifyDataSetChanged();
        }
    }

    private void init() {
        LayoutInflater.from(mContext).inflate(R.layout.nav_screen, this);
        setContentDescription(mContext.getResources().getString(
                R.string.accessibility_transition_navscreen));
        mBookmarks = (ImageButton) findViewById(R.id.bookmarks);
        mNewTab = (ImageButton) findViewById(R.id.newtab);
        mMore = (ImageButton) findViewById(R.id.more);
        mBookmarks.setOnClickListener(this);
        mNewTab.setOnClickListener(this);
        mMore.setOnClickListener(this);
        mScroller = (NavTabGallery) findViewById(R.id.scroller);
        TabControl tc = mUiController.getTabControl();
        mTabViews = new HashMap<Tab, View>(tc.getTabCount());
        mAdapter = new TabAdapter(mContext, tc);
        mScroller.setOrientation(mOrientation == Configuration.ORIENTATION_LANDSCAPE
                ? LinearLayout.HORIZONTAL : LinearLayout.VERTICAL);
        // update state for active tab
        mScroller.setAdapter(mAdapter,
                mUiController.getTabControl().getTabPosition(mUi.getActiveTab()));
        mScroller.setOnRemoveListener(new OnRemoveListener() {
            public void onRemovePosition(int pos) {
                Tab tab = mAdapter.getItem(pos);
                onCloseTab(tab);
            }
        });
        mNeedsMenu = !ViewConfiguration.get(getContext()).hasPermanentMenuKey();
        if (!mNeedsMenu) {
            mMore.setVisibility(View.GONE);
        }
    }

    @Override
    public void onClick(View v) {
        WebView web = (mTab != null) ? mTab.getWebView() : null;
        if (web != null) {
            if (mForward == v) {
                mUi.hideNavScreen(true);
                mTab.goForward();
            } else if (mRefresh == v) {
                mUi.hideNavScreen(true);
                web.reload();
            }
        }
        if (mBookmarks == v) {
            switchToSelected();
            mUiController.bookmarksOrHistoryPicker(false);
        } else if (mNewTab == v) {
            openNewTab();
        } else if (mMore == v) {
            showMenu();
        } else if (mTitle == v) {
            mUi.getTitleBar().setSkipTitleBarAnimations(true);
            close(false);
            mUi.editUrl(false);
            mUi.getTitleBar().setSkipTitleBarAnimations(false);
        }
    }

    private void onCloseTab(Tab tab) {
        if (tab != null) {
            if (tab == mUiController.getCurrentTab()) {
                mUiController.closeCurrentTab();
            } else {
                mUiController.closeTab(tab);
            }
            mAdapter.notifyDataSetChanged();
        }
    }

    private void openNewTab() {
        // need to call openTab explicitely with setactive false
        Tab tab = mUiController.openTab(BrowserSettings.getInstance().getHomePage(),
                false, false, false);
        int duration = 0;
        if (tab != null) {
            mUiController.setBlockEvents(true);
            int oldsel = mScroller.getSelectedItemPosition();
            final int tix = mUi.mTabControl.getTabPosition(tab);
            duration = SCROLL_MIN + SCROLL_FACTOR * Math.abs(oldsel - tix);
            mScroller.handleDataChanged();
            mScroller.smoothScrollToPosition(tix, duration, new OnScrollFinishedListener() {
                @Override
                public void onScrollFinished() {
                    mUiController.setBlockEvents(false);
                    mUi.hideNavScreen(true);
                    switchToSelected();
                }
            });
        }
    }

    View getSelectedTabView() {
        return mScroller.getSelectedTab();
    }

    private void switchToSelected() {
        Tab tab = (Tab) mScroller.getSelectedItem();
        if (tab != mUi.getActiveTab()) {
            mUiController.setActiveTab(tab);
        }
    }

    protected void close() {
        close(true);
    }

    protected void close(boolean animate) {
        mUi.hideNavScreen(animate);
    }

    class TabAdapter extends BaseAdapter {

        Context context;
        TabControl tabControl;

        public TabAdapter(Context ctx, TabControl tc) {
            context = ctx;
            tabControl = tc;
        }

        @Override
        public int getCount() {
            return tabControl.getTabCount();
        }

        @Override
        public Tab getItem(int position) {
            return tabControl.getTab(position);
        }

        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(final int position, View convertView, ViewGroup parent) {
            final NavTabView tabview = new NavTabView(mActivity);
            final Tab tab = getItem(position);
            tabview.setWebView(tab);
            mTabViews.put(tab, tabview.mImage);
            tabview.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (tabview.isClose(v)) {
                        mScroller.animateOut(tabview);
                    } else if (tabview.isTitle(v)) {
                        mScroller.setSelection(position);
                        switchToSelected();
                        mUi.getTitleBar().setSkipTitleBarAnimations(true);
                        close(false);
                        mUi.editUrl(false);
                        mUi.getTitleBar().setSkipTitleBarAnimations(false);
                    } else if (tabview.isWebView(v)) {
                        mScroller.setSelection(position);
                        close();
                    }
                }
            });
            return tabview;
        }

    }

    @Override
    public void onThumbnailUpdated(Tab t) {
        View v = mTabViews.get(t);
        if (v != null) {
            v.invalidate();
            mScroller.invalidate();
        }
    }

}