/*
 * 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.preferences;

import android.app.AlertDialog;
import android.app.ListFragment;
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.AsyncTask;
import android.os.Bundle;
import android.os.Parcel;
import android.os.Parcelable;
import android.preference.PreferenceActivity;
import android.provider.BrowserContract.Bookmarks;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.webkit.GeolocationPermissions;
import android.webkit.ValueCallback;
import android.webkit.WebStorage;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.android.browser.R;
import com.android.browser.WebStorageSizeManager;

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

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

    private static final String EXTRA_SITE = "site";
    private String LOGTAG = "WebsiteSettingsActivity";
    private static String sMBStored = null;
    private SiteAdapter mAdapter = null;
    private Site mSite = null;

    static class Site implements Parcelable {
        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.
        final static int FEATURE_WEB_STORAGE = 0;
        final static int FEATURE_GEOLOCATION = 1;
        // The number of features available.
        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 void removeFeature(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;
        }

        @Override
        public int describeContents() {
            return 0;
        }

        @Override
        public void writeToParcel(Parcel dest, int flags) {
            dest.writeString(mOrigin);
            dest.writeString(mTitle);
            dest.writeInt(mFeatures);
            dest.writeParcelable(mIcon, flags);
        }

        private Site(Parcel in) {
            mOrigin = in.readString();
            mTitle = in.readString();
            mFeatures = in.readInt();
            mIcon = in.readParcelable(null);
        }

        public static final Parcelable.Creator<Site> CREATOR
                = new Parcelable.Creator<Site>() {
            public Site createFromParcel(Parcel in) {
                return new Site(in);
            }

            public Site[] newArray(int size) {
                return new Site[size];
            }
        };

    }

    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 mUsageHighIcon;
        private Bitmap mLocationAllowedIcon;
        private Bitmap mLocationDisallowedIcon;
        private Site mCurrentSite;

        public SiteAdapter(Context context, int rsc) {
            this(context, rsc, null);
        }

        public SiteAdapter(Context context, int rsc, Site site) {
            super(context, rsc);
            mResource = rsc;
            mInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            mDefaultIcon = BitmapFactory.decodeResource(getResources(),
                    R.drawable.app_web_browser_sm);
            mUsageEmptyIcon = BitmapFactory.decodeResource(getResources(),
                    R.drawable.ic_list_data_off);
            mUsageLowIcon = BitmapFactory.decodeResource(getResources(),
                    R.drawable.ic_list_data_small);
            mUsageHighIcon = BitmapFactory.decodeResource(getResources(),
                    R.drawable.ic_list_data_large);
            mLocationAllowedIcon = BitmapFactory.decodeResource(getResources(),
                    R.drawable.ic_gps_on_holo_dark);
            mLocationDisallowedIcon = BitmapFactory.decodeResource(getResources(),
                    R.drawable.ic_gps_denied_holo_dark);
            mCurrentSite = site;
            if (mCurrentSite == null) {
                askForOrigins();
            }
        }

        /**
         * 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<String, Site> 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 askForOrigins() {
            // 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.

            WebStorage.getInstance().getOrigins(new ValueCallback<Map>() {
                public void onReceiveValue(Map origins) {
                    Map<String, Site> sites = new HashMap<String, Site>();
                    if (origins != null) {
                        Iterator<String> iter = origins.keySet().iterator();
                        while (iter.hasNext()) {
                            addFeatureToSite(sites, iter.next(), Site.FEATURE_WEB_STORAGE);
                        }
                    }
                    askForGeolocation(sites);
                }
            });
        }

        public void askForGeolocation(final Map<String, Site> sites) {
            GeolocationPermissions.getInstance().getOrigins(new ValueCallback<Set<String> >() {
                public void onReceiveValue(Set<String> origins) {
                    if (origins != null) {
                        Iterator<String> iter = origins.iterator();
                        while (iter.hasNext()) {
                            addFeatureToSite(sites, iter.next(), Site.FEATURE_GEOLOCATION);
                        }
                    }
                    populateIcons(sites);
                    populateOrigins(sites);
                }
            });
        }

        public void populateIcons(Map<String, Site> sites) {
            // Create a map from host to origin. This is used to add metadata
            // (title, icon) for this origin from the bookmarks DB. We must do
            // the DB access on a background thread.
            new UpdateFromBookmarksDbTask(this.getContext(), sites).execute();
        }

        private class UpdateFromBookmarksDbTask extends AsyncTask<Void, Void, Void> {

            private Context mContext;
            private boolean mDataSetChanged;
            private Map<String, Site> mSites;

            public UpdateFromBookmarksDbTask(Context ctx, Map<String, Site> sites) {
                mContext = ctx.getApplicationContext();
                mSites = sites;
            }

            protected Void doInBackground(Void... unused) {
                HashMap<String, Set<Site>> hosts = new HashMap<String, Set<Site>>();
                Set<Map.Entry<String, Site>> elements = mSites.entrySet();
                Iterator<Map.Entry<String, Site>> originIter = elements.iterator();
                while (originIter.hasNext()) {
                    Map.Entry<String, Site> entry = originIter.next();
                    Site site = entry.getValue();
                    String host = Uri.parse(entry.getKey()).getHost();
                    Set<Site> hostSites = null;
                    if (hosts.containsKey(host)) {
                        hostSites = (Set<Site>)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 = mContext.getContentResolver().query(Bookmarks.CONTENT_URI,
                        new String[] { Bookmarks.URL, Bookmarks.TITLE, Bookmarks.FAVICON },
                        Bookmarks.IS_FOLDER + " == 0", null, null);

                if (c != null) {
                    if (c.moveToFirst()) {
                        int urlIndex = c.getColumnIndex(Bookmarks.URL);
                        int titleIndex = c.getColumnIndex(Bookmarks.TITLE);
                        int faviconIndex = c.getColumnIndex(Bookmarks.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();
                                    // We should only set the title if the bookmark is for the root
                                    // (i.e. www.google.com), as website settings act on the origin
                                    // as a whole rather than a single page under that origin. If the
                                    // user has bookmarked a page under the root but *not* the root,
                                    // then we risk displaying the title of that page which may or
                                    // may not have any relevance to the origin.
                                    if (url.equals(site.getOrigin()) ||
                                            (new String(site.getOrigin()+"/")).equals(url)) {
                                        mDataSetChanged = true;
                                        site.setTitle(title);
                                    }

                                    if (bmp != null) {
                                        mDataSetChanged = true;
                                        site.setIcon(bmp);
                                    }
                                }
                            }
                        } while (c.moveToNext());
                    }
                    c.close();
                }
            return null;
            }

            protected void onPostExecute(Void unused) {
                if (mDataSetChanged) {
                    notifyDataSetChanged();
                }
            }
        }


        public void populateOrigins(Map<String, Site> sites) {
            clear();

            // We can now simply populate our array with Site instances
            Set<Map.Entry<String, Site>> elements = sites.entrySet();
            Iterator<Map.Entry<String, Site>> entryIterator = elements.iterator();
            while (entryIterator.hasNext()) {
                Map.Entry<String, Site> entry = entryIterator.next();
                Site site = entry.getValue();
                add(site);
            }

            notifyDataSetChanged();

            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: " + bytes);
                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;
                askForOrigins();
                return true;
            }
            return false;
        }

        /**
         * @hide
         * Utility function
         * Set the icon according to the usage
         */
        public void setIconForUsage(ImageView usageIcon, long usageInBytes) {
            float usageInMegabytes = (float) usageInBytes / (1024.0F * 1024.0F);
            // We set the correct icon:
            // 0 < empty < 0.1MB
            // 0.1MB < low < 5MB
            // 5MB < high
            if (usageInMegabytes <= 0.1) {
                usageIcon.setImageBitmap(mUsageEmptyIcon);
            } else if (usageInMegabytes > 0.1 && usageInMegabytes <= 5) {
                usageIcon.setImageBitmap(mUsageLowIcon);
            } else if (usageInMegabytes > 5) {
                usageIcon.setImageBitmap(mUsageHighIcon);
            }
        }

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

            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);
            featureIcon = (ImageView) view.findViewById(R.id.feature_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) {

                Site site = getItem(position);
                title.setText(site.getPrettyTitle());
                String subtitleText = site.getPrettyOrigin();
                if (subtitleText != null) {
                    title.setMaxLines(1);
                    title.setSingleLine(true);
                    subtitle.setVisibility(View.VISIBLE);
                    subtitle.setText(subtitleText);
                } else {
                    subtitle.setVisibility(View.GONE);
                    title.setMaxLines(2);
                    title.setSingleLine(false);
                }

                icon.setVisibility(View.VISIBLE);
                usageIcon.setVisibility(View.INVISIBLE);
                locationIcon.setVisibility(View.INVISIBLE);
                featureIcon.setVisibility(View.GONE);
                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);

                String origin = site.getOrigin();
                if (site.hasFeature(Site.FEATURE_WEB_STORAGE)) {
                    WebStorage.getInstance().getUsageForOrigin(origin, new ValueCallback<Long>() {
                        public void onReceiveValue(Long value) {
                            if (value != null) {
                                setIconForUsage(usageIcon, value.longValue());
                                usageIcon.setVisibility(View.VISIBLE);
                            }
                        }
                    });
                }

                if (site.hasFeature(Site.FEATURE_GEOLOCATION)) {
                    locationIcon.setVisibility(View.VISIBLE);
                    GeolocationPermissions.getInstance().getAllowed(origin, new ValueCallback<Boolean>() {
                        public void onReceiveValue(Boolean allowed) {
                            if (allowed != null) {
                                if (allowed.booleanValue()) {
                                    locationIcon.setImageBitmap(mLocationAllowedIcon);
                                } else {
                                    locationIcon.setImageBitmap(mLocationDisallowedIcon);
                                }
                            }
                        }
                    });
                }
            } else {
                icon.setVisibility(View.GONE);
                locationIcon.setVisibility(View.GONE);
                usageIcon.setVisibility(View.GONE);
                featureIcon.setVisibility(View.VISIBLE);
                String origin = mCurrentSite.getOrigin();
                switch (mCurrentSite.getFeatureByIndex(position)) {
                    case Site.FEATURE_WEB_STORAGE:
                        WebStorage.getInstance().getUsageForOrigin(origin, new ValueCallback<Long>() {
                            public void onReceiveValue(Long value) {
                                if (value != null) {
                                    String usage = sizeValueToString(value.longValue()) + " " + sMBStored;
                                    title.setText(R.string.webstorage_clear_data_title);
                                    subtitle.setText(usage);
                                    subtitle.setVisibility(View.VISIBLE);
                                    setIconForUsage(featureIcon, value.longValue());
                                }
                            }
                        });
                        break;
                    case Site.FEATURE_GEOLOCATION:
                        title.setText(R.string.geolocation_settings_page_title);
                        GeolocationPermissions.getInstance().getAllowed(origin, new ValueCallback<Boolean>() {
                            public void onReceiveValue(Boolean allowed) {
                                if (allowed != null) {
                                    if (allowed.booleanValue()) {
                                        subtitle.setText(R.string.geolocation_settings_page_summary_allowed);
                                        featureIcon.setImageBitmap(mLocationAllowedIcon);
                                    } else {
                                        subtitle.setText(R.string.geolocation_settings_page_summary_not_allowed);
                                        featureIcon.setImageBitmap(mLocationDisallowedIcon);
                                    }
                                    subtitle.setVisibility(View.VISIBLE);
                                }
                            }
                        });
                        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())
                            .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());
                                    // If this site has no more features, then go back to the
                                    // origins list.
                                    mCurrentSite.removeFeature(Site.FEATURE_WEB_STORAGE);
                                    if (mCurrentSite.getFeatureCount() == 0) {
                                        finish();
                                    }
                                    askForOrigins();
                                    notifyDataSetChanged();
                                }})
                            .setNegativeButton(R.string.webstorage_clear_data_dialog_cancel_button, null)
                            .setIconAttribute(android.R.attr.alertDialogIcon)
                            .show();
                        break;
                    case Site.FEATURE_GEOLOCATION:
                        new AlertDialog.Builder(getContext())
                            .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.removeFeature(Site.FEATURE_GEOLOCATION);
                                    if (mCurrentSite.getFeatureCount() == 0) {
                                        finish();
                                    }
                                    askForOrigins();
                                    notifyDataSetChanged();
                                }})
                            .setNegativeButton(R.string.geolocation_settings_page_dialog_cancel_button, null)
                            .setIconAttribute(android.R.attr.alertDialogIcon)
                            .show();
                        break;
                }
            } else {
                Site site = (Site) view.getTag();
                PreferenceActivity activity = (PreferenceActivity) getActivity();
                if (activity != null) {
                    Bundle args = new Bundle();
                    args.putParcelable(EXTRA_SITE, site);
                    activity.startPreferencePanel(WebsiteSettingsFragment.class.getName(), args, 0,
                            site.getPrettyTitle(), null, 0);
                }
            }
        }

        public Site currentSite() {
            return mCurrentSite;
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.website_settings, container, false);
        Bundle args = getArguments();
        if (args != null) {
            mSite = (Site) args.getParcelable(EXTRA_SITE);
        }
        if (mSite == null) {
            View clear = view.findViewById(R.id.clear_all_button);
            clear.setVisibility(View.VISIBLE);
            clear.setOnClickListener(this);
        }
        return view;
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        if (sMBStored == null) {
            sMBStored = getString(R.string.webstorage_origin_summary_mb_stored);
        }
        mAdapter = new SiteAdapter(getActivity(), R.layout.website_settings_row);
        if (mSite != null) {
            mAdapter.mCurrentSite = mSite;
        }
        getListView().setAdapter(mAdapter);
        getListView().setOnItemClickListener(mAdapter);
    }

    @Override
    public void onResume() {
        super.onResume();
        mAdapter.askForOrigins();
    }

    private void finish() {
        PreferenceActivity activity = (PreferenceActivity) getActivity();
        if (activity != null) {
            activity.finishPreferencePanel(this, 0, null);
        }
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.clear_all_button:
         // Show the prompt to clear all origins of their data and geolocation permissions.
            new AlertDialog.Builder(getActivity())
                    .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();
                                    WebStorageSizeManager.resetLastOutOfSpaceNotificationTime();
                                    mAdapter.askForOrigins();
                                    finish();
                                }})
                    .setNegativeButton(R.string.website_settings_clear_all_dialog_cancel_button, null)
                    .setIconAttribute(android.R.attr.alertDialogIcon)
                    .show();
            break;
        }
    }
}