/*
 * Copyright (C) 2009 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.content.Context;
import android.graphics.Bitmap;
import android.os.Handler;
import android.util.AttributeSet;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;

public class ActiveTabsPage extends LinearLayout {

    private static final String LOGTAG = "TabPicker";

    private final LayoutInflater mFactory;
    private final UiController mUiController;
    private final TabControl mControl;
    private final TabsListAdapter mAdapter;
    private final ListView mListView;

    public ActiveTabsPage(Context context, UiController control) {
        super(context);
        mUiController = control;
        mControl = control.getTabControl();
        mFactory = LayoutInflater.from(context);
        mFactory.inflate(R.layout.active_tabs, this);
        mListView = (ListView) findViewById(R.id.list);
        mAdapter = new TabsListAdapter();
        mListView.setAdapter(mAdapter);
        mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                public void onItemClick(AdapterView<?> parent, View view,
                        int position, long id) {
                    if (mControl.canCreateNewTab()) {
                        position -= 2;
                    }
                    boolean needToAttach = false;
                    if (position == -2) {
                        // Create a new tab
                        mUiController.openTabToHomePage();
                    } else if (position == -1) {
                        // Create a new incognito tab
                        mUiController.openIncognitoTab();
                    } else {
                        // Open the corresponding tab
                        // If the tab is the current one, switchToTab will
                        // do nothing and return, so we need to make sure
                        // it gets attached back to its mContentView in
                        // removeActiveTabPage
                        needToAttach = !mUiController.switchToTab(position);
                    }
                    mUiController.removeActiveTabsPage(needToAttach);
                }
        });
    }

    /**
     * Special class to hold the close drawable.  Its sole purpose is to allow
     * the parent to be pressed without being pressed itself.  This way the line
     * of a tab can be pressed, but the close button itself is not.
     */
    private static class CloseHolder extends ImageView {
        public CloseHolder(Context context, AttributeSet attrs) {
            super(context, attrs);
        }

        @Override
        public void setPressed(boolean pressed) {
            // If the parent is pressed, do not set to pressed.
            if (pressed && ((View) getParent()).isPressed()) {
                return;
            }
            super.setPressed(pressed);
        }
    }

    private class TabsListAdapter extends BaseAdapter {
        private boolean mNotified = true;
        private int mReturnedCount;
        private Handler mHandler = new Handler();

        public int getCount() {
            int count = mControl.getTabCount();
            if (mControl.canCreateNewTab()) {
                count += 2;
            }
            // XXX: This is a workaround to be more like a real adapter. Most
            // adapters call notifyDataSetChanged() whenever the internal data
            // has changed. Since TabControl is our internal data, we don't
            // know when that changes.
            //
            // Keep track of the last count we returned and whether we called
            // notifyDataSetChanged(). If we did not initiate a data set
            // change, and the count is different, send the notify and return
            // the old count.
            if (!mNotified && count != mReturnedCount) {
                notifyChange();
                return mReturnedCount;
            }
            mReturnedCount = count;
            mNotified = false;
            return count;
        }
        public Object getItem(int position) {
            return null;
        }
        public long getItemId(int position) {
            return position;
        }
        public int getViewTypeCount() {
            return 2;
        }
        public int getItemViewType(int position) {
            if (mControl.canCreateNewTab()) {
                position -= 2;
            }
            // Do not recycle the "add new tab" item.
            return position < 0 ? IGNORE_ITEM_VIEW_TYPE : 1;
        }
        public View getView(int position, View convertView, ViewGroup parent) {
            final int tabCount = mControl.getTabCount();
            if (mControl.canCreateNewTab()) {
                position -= 2;
            }

            if (convertView == null) {
                if (position == -2) {
                    convertView = mFactory.inflate(R.layout.tab_view_add_tab, null);
                } else if (position == -1) {
                    convertView = mFactory.inflate(R.layout.tab_view_add_incognito_tab, null);
                } else {
                    convertView = mFactory.inflate(R.layout.tab_view, null);
                }
            }

            if (position >= 0) {
                TextView title =
                        (TextView) convertView.findViewById(R.id.title);
                TextView url = (TextView) convertView.findViewById(R.id.url);
                ImageView favicon =
                        (ImageView) convertView.findViewById(R.id.favicon);
                View close = convertView.findViewById(R.id.close);
                Tab tab = mControl.getTab(position);
                if (tab.getWebView() == null) {
                    // This means that populatePickerData will have to use the
                    // saved state.
                    Log.w(LOGTAG, "Tab " + position + " has a null WebView and "
                            + (tab.getSavedState() == null ? "null" : "non-null")
                            + " saved state ");
                }
                tab.populatePickerData();
                if (tab.getTitle() == null || tab.getTitle().length() == 0) {
                    Log.w(LOGTAG, "Tab " + position + " has no title. "
                            + "Check above in the Logs to see whether it has a "
                            + "null WebView or null WebHistoryItem");
                }
                title.setText(tab.getTitle());
                url.setText(tab.getUrl());
                Bitmap icon = tab.getFavicon();
                if (icon != null) {
                    favicon.setImageBitmap(icon);
                } else {
                    favicon.setImageResource(R.drawable.app_web_browser_sm);
                }
                final int closePosition = position;
                close.setOnClickListener(new View.OnClickListener() {
                        public void onClick(View v) {
                            mUiController.closeTab(
                                    mControl.getTab(closePosition));
                            if (tabCount == 1) {
                                mUiController.openTabToHomePage();
                                mUiController.removeActiveTabsPage(false);
                            } else {
                                mNotified = true;
                                notifyDataSetChanged();
                            }
                        }
                });
            }
            return convertView;
        }

        void notifyChange() {
            mHandler.post(new Runnable() {
                public void run() {
                    mNotified = true;
                    notifyDataSetChanged();
                }
            });
        }
    }
}