/*
 * 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.app.AlertDialog;
import android.app.ListActivity;
import android.content.Context;
import android.content.DialogInterface;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.provider.Browser;
import android.util.Log;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.GeolocationPermissions;
import android.webkit.WebIconDatabase;
import android.webkit.WebStorage;
import android.widget.ArrayAdapter;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.Vector;

/**
 * Manage the settings for an origin.
 * We use it to keep track of the 'HTML5' settings, i.e. database (webstorage)
 * and Geolocation.
 */
public class WebsiteSettingsActivity extends ListActivity {

    private String LOGTAG = "WebsiteSettingsActivity";
    private static String sMBStored = null;
    private SiteAdapter mAdapter = null;

    class Site {
        private String mOrigin;
        private String mTitle;
        private Bitmap mIcon;
        private int mFeatures;

        // These constants provide the set of features that a site may support
        // They must be consecutive. To add a new feature, add a new FEATURE_XXX
        // variable with value equal to the current value of FEATURE_COUNT, then
        // increment FEATURE_COUNT.
        private final static int FEATURE_WEB_STORAGE = 0;
        private final static int FEATURE_GEOLOCATION = 1;
        // The number of features available.
        private final static int FEATURE_COUNT = 2;

        public Site(String origin) {
            mOrigin = origin;
            mTitle = null;
            mIcon = null;
            mFeatures = 0;
        }

        public void addFeature(int feature) {
            mFeatures |= (1 << feature);
        }

        public boolean hasFeature(int feature) {
            return (mFeatures & (1 << feature)) != 0;
        }

        /**
         * Gets the number of features supported by this site.
         */
        public int getFeatureCount() {
            int count = 0;
            for (int i = 0; i < FEATURE_COUNT; ++i) {
                count += hasFeature(i) ? 1 : 0;
            }
            return count;
        }

        /**
         * Gets the ID of the nth (zero-based) feature supported by this site.
         * The return value is a feature ID - one of the FEATURE_XXX values.
         * This is required to determine which feature is displayed at a given
         * position in the list of features for this site. This is used both
         * when populating the view and when responding to clicks on the list.
         */
        public int getFeatureByIndex(int n) {
            int j = -1;
            for (int i = 0; i < FEATURE_COUNT; ++i) {
                j += hasFeature(i) ? 1 : 0;
                if (j == n) {
                    return i;
                }
            }
            return -1;
        }

        public String getOrigin() {
            return mOrigin;
        }

        public void setTitle(String title) {
            mTitle = title;
        }

        public void setIcon(Bitmap icon) {
            mIcon = icon;
        }

        public Bitmap getIcon() {
            return mIcon;
        }

        public String getPrettyOrigin() {
            return mTitle == null ? null : hideHttp(mOrigin);
        }

        public String getPrettyTitle() {
            return mTitle == null ? hideHttp(mOrigin) : mTitle;
        }

        private String hideHttp(String str) {
            Uri uri = Uri.parse(str);
            return "http".equals(uri.getScheme()) ?  str.substring(7) : str;
        }
    }

    class SiteAdapter extends ArrayAdapter<Site>
            implements AdapterView.OnItemClickListener {
        private int mResource;
        private LayoutInflater mInflater;
        private Bitmap mDefaultIcon;
        private Bitmap mUsageEmptyIcon;
        private Bitmap mUsageLowIcon;
        private Bitmap mUsageMediumIcon;
        private Bitmap mUsageHighIcon;
        private Bitmap mLocationIcon;
        private Site mCurrentSite;

        public SiteAdapter(Context context, int rsc) {
            super(context, rsc);
            mResource = rsc;
            mInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            mDefaultIcon = BitmapFactory.decodeResource(getResources(),
                    R.drawable.ic_launcher_shortcut_browser_bookmark);
            mUsageEmptyIcon = BitmapFactory.decodeResource(getResources(),
                    R.drawable.usage_empty);
            mUsageLowIcon = BitmapFactory.decodeResource(getResources(),
                    R.drawable.usage_low);
            mUsageMediumIcon = BitmapFactory.decodeResource(getResources(),
                    R.drawable.usage_medium);
            mUsageHighIcon = BitmapFactory.decodeResource(getResources(),
                    R.drawable.usage_high);
            mLocationIcon = BitmapFactory.decodeResource(getResources(),
                    R.drawable.location);
            populateOrigins();
        }

        /**
         * Adds the specified feature to the site corresponding to supplied
         * origin in the map. Creates the site if it does not already exist.
         */
        private void addFeatureToSite(Map sites, String origin, int feature) {
            Site site = null;
            if (sites.containsKey(origin)) {
                site = (Site) sites.get(origin);
            } else {
                site = new Site(origin);
                sites.put(origin, site);
            }
            site.addFeature(feature);
        }

        public void populateOrigins() {
            clear();

            // Get the list of origins we want to display.
            // All 'HTML 5 modules' (Database, Geolocation etc) form these
            // origin strings using WebCore::SecurityOrigin::toString(), so it's
            // safe to group origins here. Note that WebCore::SecurityOrigin
            // uses 0 (which is not printed) for the port if the port is the
            // default for the protocol. Eg http://www.google.com and
            // http://www.google.com:80 both record a port of 0 and hence
            // toString() == 'http://www.google.com' for both.
            Set origins = WebStorage.getInstance().getOrigins();
            Map sites = new HashMap<String, Site>();
            if (origins != null) {
                Iterator<String> iter = origins.iterator();
                while (iter.hasNext()) {
                    addFeatureToSite(sites, iter.next(), Site.FEATURE_WEB_STORAGE);
                }
            }
            origins = GeolocationPermissions.getInstance().getOrigins();
            if (origins != null) {
                Iterator<String> iter = origins.iterator();
                while (iter.hasNext()) {
                    addFeatureToSite(sites, iter.next(), Site.FEATURE_GEOLOCATION);
                }
            }

            // Create a map from host to origin. This is used to add metadata
            // (title, icon) for this origin from the bookmarks DB.
            HashMap hosts = new HashMap<String, Set<Site> >();
            Set keys = sites.keySet();
            Iterator<String> originIter = keys.iterator();
            while (originIter.hasNext()) {
                String origin = originIter.next();
                Site site = (Site) sites.get(origin);
                String host = Uri.parse(origin).getHost();
                Set hostSites = null;
                if (hosts.containsKey(host)) {
                    hostSites = (Set) hosts.get(host);
                } else {
                    hostSites = new HashSet<Site>();
                    hosts.put(host, hostSites);
                }
                hostSites.add(site);
            }

            // Check the bookmark DB. If we have data for a host used by any of
            // our origins, use it to set their title and favicon
            Cursor c = getContext().getContentResolver().query(Browser.BOOKMARKS_URI,
                    new String[] { Browser.BookmarkColumns.URL, Browser.BookmarkColumns.TITLE,
                    Browser.BookmarkColumns.FAVICON }, "bookmark = 1", null, null);

            if ((c != null) && c.moveToFirst()) {
                int urlIndex = c.getColumnIndex(Browser.BookmarkColumns.URL);
                int titleIndex = c.getColumnIndex(Browser.BookmarkColumns.TITLE);
                int faviconIndex = c.getColumnIndex(Browser.BookmarkColumns.FAVICON);
                do {
                    String url = c.getString(urlIndex);
                    String host = Uri.parse(url).getHost();
                    if (hosts.containsKey(host)) {
                        String title = c.getString(titleIndex);
                        Bitmap bmp = null;
                        byte[] data = c.getBlob(faviconIndex);
                        if (data != null) {
                            bmp = BitmapFactory.decodeByteArray(data, 0, data.length);
                        }
                        Set matchingSites = (Set) hosts.get(host);
                        Iterator<Site> sitesIter = matchingSites.iterator();
                        while (sitesIter.hasNext()) {
                            Site site = sitesIter.next();
                            site.setTitle(title);
                            if (bmp != null) {
                                site.setIcon(bmp);
                            }
                        }
                    }
                } while (c.moveToNext());
            }

            // We can now simply populate our array with Site instances
            keys = sites.keySet();
            originIter = keys.iterator();
            while (originIter.hasNext()) {
                String origin = originIter.next();
                Site site = (Site) sites.get(origin);
                add(site);
            }

            if (getCount() == 0) {
                finish(); // we close the screen
            }
        }

        public int getCount() {
            if (mCurrentSite == null) {
                return super.getCount();
            }
            return mCurrentSite.getFeatureCount();
        }

        public String sizeValueToString(long bytes) {
            // We display the size in MB, to 1dp, rounding up to the next 0.1MB.
            // bytes should always be greater than zero.
            if (bytes <= 0) {
                Log.e(LOGTAG, "sizeValueToString called with non-positive value");
                return "0";
            }
            float megabytes = (float) bytes / (1024.0F * 1024.0F);
            int truncated = (int) Math.ceil(megabytes * 10.0F);
            float result = (float) (truncated / 10.0F);
            return String.valueOf(result);
        }

        /*
         * If we receive the back event and are displaying
         * site's settings, we want to go back to the main
         * list view. If not, we just do nothing (see
         * dispatchKeyEvent() below).
         */
        public boolean backKeyPressed() {
            if (mCurrentSite != null) {
                mCurrentSite = null;
                populateOrigins();
                notifyDataSetChanged();
                return true;
            }
            return false;
        }

        public View getView(int position, View convertView, ViewGroup parent) {
            View view;
            TextView title;
            TextView subtitle;
            ImageView icon;
            ImageView usageIcon;
            ImageView locationIcon;

            if (convertView == null) {
                view = mInflater.inflate(mResource, parent, false);
            } else {
                view = convertView;
            }

            title = (TextView) view.findViewById(R.id.title);
            subtitle = (TextView) view.findViewById(R.id.subtitle);
            icon = (ImageView) view.findViewById(R.id.icon);
            usageIcon = (ImageView) view.findViewById(R.id.usage_icon);
            locationIcon = (ImageView) view.findViewById(R.id.location_icon);
            usageIcon.setVisibility(View.GONE);
            locationIcon.setVisibility(View.GONE);

            if (mCurrentSite == null) {
                setTitle(getString(R.string.pref_extras_website_settings));

                Site site = getItem(position);
                title.setText(site.getPrettyTitle());
                subtitle.setText(site.getPrettyOrigin());
                icon.setVisibility(View.VISIBLE);
                usageIcon.setVisibility(View.INVISIBLE);
                locationIcon.setVisibility(View.INVISIBLE);
                Bitmap bmp = site.getIcon();
                if (bmp == null) {
                    bmp = mDefaultIcon;
                }
                icon.setImageBitmap(bmp);
                // We set the site as the view's tag,
                // so that we can get it in onItemClick()
                view.setTag(site);

                if (site.hasFeature(Site.FEATURE_WEB_STORAGE)) {
                  String origin = site.getOrigin();
                  long usageInBytes = WebStorage.getInstance().getUsageForOrigin(origin);
                  float usageInMegabytes = (float) usageInBytes / (1024.0F * 1024.0F);
                  usageIcon.setVisibility(View.VISIBLE);

                  // We set the correct icon:
                  // 0 < empty < 0.1MB
                  // 0.1MB < low < 3MB
                  // 3MB < medium < 6MB
                  // 6MB < high
                  if (usageInMegabytes <= 0.1) {
                    usageIcon.setImageBitmap(mUsageEmptyIcon);
                  } else if (usageInMegabytes > 0.1 && usageInMegabytes <= 3) {
                    usageIcon.setImageBitmap(mUsageLowIcon);
                  } else if (usageInMegabytes > 3 && usageInMegabytes <= 6) {
                    usageIcon.setImageBitmap(mUsageMediumIcon);
                  } else if (usageInMegabytes > 6) {
                    usageIcon.setImageBitmap(mUsageHighIcon);
                  }
                }

                if (site.hasFeature(Site.FEATURE_GEOLOCATION)) {
                  locationIcon.setVisibility(View.VISIBLE);
                  locationIcon.setImageBitmap(mLocationIcon);
                }
            } else {
                setTitle(mCurrentSite.getPrettyTitle());
                icon.setVisibility(View.GONE);
                String origin = mCurrentSite.getOrigin();
                switch (mCurrentSite.getFeatureByIndex(position)) {
                    case Site.FEATURE_WEB_STORAGE:
                        long usageValue = WebStorage.getInstance().getUsageForOrigin(origin);
                        String usage = sizeValueToString(usageValue) + " " + sMBStored;

                        title.setText(R.string.webstorage_clear_data_title);
                        subtitle.setText(usage);
                        break;
                    case Site.FEATURE_GEOLOCATION:
                        title.setText(R.string.geolocation_settings_page_title);
                        boolean allowed = GeolocationPermissions.getInstance().getAllowed(origin);
                        subtitle.setText(allowed ?
                                         R.string.geolocation_settings_page_summary_allowed :
                                         R.string.geolocation_settings_page_summary_not_allowed);
                        break;
                }
            }

            return view;
        }

        public void onItemClick(AdapterView<?> parent,
                                View view,
                                int position,
                                long id) {
            if (mCurrentSite != null) {
                switch (mCurrentSite.getFeatureByIndex(position)) {
                    case Site.FEATURE_WEB_STORAGE:
                        new AlertDialog.Builder(getContext())
                            .setTitle(R.string.webstorage_clear_data_dialog_title)
                            .setMessage(R.string.webstorage_clear_data_dialog_message)
                            .setPositiveButton(R.string.webstorage_clear_data_dialog_ok_button,
                                               new AlertDialog.OnClickListener() {
                                public void onClick(DialogInterface dlg, int which) {
                                    WebStorage.getInstance().deleteOrigin(mCurrentSite.getOrigin());
                                    mCurrentSite = null;
                                    populateOrigins();
                                    notifyDataSetChanged();
                                }})
                            .setNegativeButton(R.string.webstorage_clear_data_dialog_cancel_button, null)
                            .setIcon(android.R.drawable.ic_dialog_alert)
                            .show();
                        break;
                    case Site.FEATURE_GEOLOCATION:
                        new AlertDialog.Builder(getContext())
                            .setTitle(R.string.geolocation_settings_page_dialog_title)
                            .setMessage(R.string.geolocation_settings_page_dialog_message)
                            .setPositiveButton(R.string.geolocation_settings_page_dialog_ok_button,
                                               new AlertDialog.OnClickListener() {
                                public void onClick(DialogInterface dlg, int which) {
                                    GeolocationPermissions.getInstance().clear(mCurrentSite.getOrigin());
                                    mCurrentSite = null;
                                    populateOrigins();
                                    notifyDataSetChanged();
                                }})
                            .setNegativeButton(R.string.geolocation_settings_page_dialog_cancel_button, null)
                            .setIcon(android.R.drawable.ic_dialog_alert)
                            .show();
                        break;
                }
            } else {
                mCurrentSite = (Site) view.getTag();
                notifyDataSetChanged();
            }
        }
    }

    /**
     * Intercepts the back key to immediately notify
     * NativeDialog that we are done.
     */
    public boolean dispatchKeyEvent(KeyEvent event) {
        if ((event.getKeyCode() == KeyEvent.KEYCODE_BACK)
            && (event.getAction() == KeyEvent.ACTION_DOWN)) {
            if ((mAdapter != null) && (mAdapter.backKeyPressed())){
                return true; // event consumed
            }
        }
        return super.dispatchKeyEvent(event);
    }

    @Override
    protected void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        if (sMBStored == null) {
            sMBStored = getString(R.string.webstorage_origin_summary_mb_stored);
        }
        mAdapter = new SiteAdapter(this, R.layout.website_settings_row);
        setListAdapter(mAdapter);
        getListView().setOnItemClickListener(mAdapter);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.websitesettings, menu);
        return true;
    }

    @Override
    public boolean onPrepareOptionsMenu(Menu menu) {
        // If we aren't listing any sites hide the clear all button (and hence the menu).
        return mAdapter.getCount() > 0;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.website_settings_menu_clear_all:
                // Show the prompt to clear all origins of their data and geolocation permissions.
                new AlertDialog.Builder(this)
                        .setTitle(R.string.website_settings_clear_all_dialog_title)
                        .setMessage(R.string.website_settings_clear_all_dialog_message)
                        .setPositiveButton(R.string.website_settings_clear_all_dialog_ok_button,
                                new AlertDialog.OnClickListener() {
                                    public void onClick(DialogInterface dlg, int which) {
                                        WebStorage.getInstance().deleteAllData();
                                        GeolocationPermissions.getInstance().clearAll();
                                        mAdapter.populateOrigins();
                                        mAdapter.notifyDataSetChanged();
                                    }})
                        .setNegativeButton(R.string.website_settings_clear_all_dialog_cancel_button, null)
                        .setIcon(android.R.drawable.ic_dialog_alert)
                        .show();
                return true;
        }
        return false;
    }
}