package net.everythingandroid.smspopup.preferences;

import net.everythingandroid.smspopup.R;
import net.everythingandroid.smspopup.util.ManageNotification;
import android.app.AlertDialog.Builder;
import android.content.Context;
import android.content.DialogInterface;
import android.content.res.TypedArray;
import android.os.Parcel;
import android.os.Parcelable;
import android.preference.Preference;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.CheckedTextView;
import android.widget.ImageView;

/**
 * A {@link Preference} that displays a list of entries as a dialog.
 * 
 * This preference will store a string into the SharedPreferences. This string will be the value
 * from the {@link #setEntryValues(CharSequence[])} array.
 * 
 * @attr ref android.R.styleable#ListPreference_entries
 * @attr ref android.R.styleable#ListPreference_entryValues
 */
public class NotificationIconListPreference extends DialogPreference {
    private CharSequence[] mEntries;
    private CharSequence[] mEntryValues;
    private String mValue;
    private String mSummary;
    private int selectedItemIndex;
    private Context context;

    public NotificationIconListPreference(Context _context, AttributeSet attrs) {
        super(_context, attrs);

        context = _context;

        // Fetch entries, values and summary info for preference
        mEntries = context.getResources().getStringArray(R.array.pref_notif_icon_entries);
        mEntryValues = context.getResources().getStringArray(R.array.pref_notif_icon_values);
        mSummary = context.getResources().getString(R.string.pref_notif_icon_summary);
    }

    public NotificationIconListPreference(Context context) {
        this(context, null);
    }

    /**
     * Sets the human-readable entries to be shown in the list. This will be shown in subsequent
     * dialogs.
     * <p>
     * Each entry must have a corresponding index in {@link #setEntryValues(CharSequence[])}.
     * 
     * @param entries
     *            The entries.
     * @see #setEntryValues(CharSequence[])
     */
    public void setEntries(CharSequence[] entries) {
        mEntries = entries;
    }

    /**
     * @see #setEntries(CharSequence[])
     * @param entriesResId
     *            The entries array as a resource.
     */
    public void setEntries(int entriesResId) {
        setEntries(getContext().getResources().getTextArray(entriesResId));
    }

    /**
     * The list of entries to be shown in the list in subsequent dialogs.
     * 
     * @return The list as an array.
     */
    public CharSequence[] getEntries() {
        return mEntries;
    }

    /**
     * The array to find the value to save for a preference when an entry from entries is selected.
     * If a user clicks on the second item in entries, the second item in this array will be saved
     * to the preference.
     * 
     * @param entryValues
     *            The array to be used as values to save for the preference.
     */
    public void setEntryValues(CharSequence[] entryValues) {
        mEntryValues = entryValues;
    }

    /**
     * @see #setEntryValues(CharSequence[])
     * @param entryValuesResId
     *            The entry values array as a resource.
     */
    public void setEntryValues(int entryValuesResId) {
        setEntryValues(getContext().getResources().getTextArray(entryValuesResId));
    }

    /**
     * Returns the array of values to be saved for the preference.
     * 
     * @return The array of values.
     */
    public CharSequence[] getEntryValues() {
        return mEntryValues;
    }

    /**
     * Sets the value of the key. This should be one of the entries in {@link #getEntryValues()}.
     * 
     * @param value
     *            The value to set for the key.
     */
    public void setValue(String value) {
        mValue = value;

        persistString(value);
    }

    /**
     * Returns the summary of this ListPreference. If the summary has a
     * {@linkplain java.lang.String#format String formatting} marker in it (i.e. "%s" or "%1$s"),
     * then the current entry value will be substituted in its place.
     * 
     * @return the summary with appropriate string substitution
     */
    @Override
    public CharSequence getSummary() {
        final CharSequence entry = getEntry();
        if (mSummary == null || entry == null) {
            return super.getSummary();
        } else {
            return String.format(mSummary, entry);
        }
    }

    /**
     * Sets the summary for this Preference with a CharSequence. If the summary has a
     * {@linkplain java.lang.String#format String formatting} marker in it (i.e. "%s" or "%1$s"),
     * then the current entry value will be substituted in its place when it's retrieved.
     * 
     * @param summary
     *            The summary for the preference.
     */
    @Override
    public void setSummary(CharSequence summary) {
        super.setSummary(summary);
        if (summary == null && mSummary != null) {
            mSummary = null;
        } else if (summary != null && !summary.equals(mSummary)) {
            mSummary = summary.toString();
        }
    }

    /**
     * Sets the value to the given index from the entry values.
     * 
     * @param index
     *            The index of the value to set.
     */
    public void setValueIndex(int index) {
        if (mEntryValues != null) {
            setValue(mEntryValues[index].toString());
        }
    }

    /**
     * Returns the value of the key. This should be one of the entries in {@link #getEntryValues()}.
     * 
     * @return The value of the key.
     */
    public String getValue() {
        return mValue;
    }

    /**
     * Returns the entry corresponding to the current value.
     * 
     * @return The entry corresponding to the current value, or null.
     */
    public CharSequence getEntry() {
        int index = getValueIndex();
        return index >= 0 && mEntries != null ? mEntries[index] : null;
    }

    /**
     * Returns the index of the given value (in the entry values array).
     * 
     * @param value
     *            The value whose index should be returned.
     * @return The index of the value, or -1 if not found.
     */
    public int findIndexOfValue(String value) {
        if (value != null && mEntryValues != null) {
            for (int i = mEntryValues.length - 1; i >= 0; i--) {
                if (mEntryValues[i].equals(value)) {
                    return i;
                }
            }
        }
        return -1;
    }

    private int getValueIndex() {
        return findIndexOfValue(mValue);
    }

    @Override
    protected void onPrepareDialogBuilder(Builder builder) {
        super.onPrepareDialogBuilder(builder);

        if (mEntries == null || mEntryValues == null) {
            throw new IllegalStateException(
                    "ListPreference requires an entries array and an entryValues array.");
        }

        selectedItemIndex = getValueIndex();

        // builder.setSingleChoiceItems(mEntries, mClickedDialogEntryIndex,
        // new DialogInterface.OnClickListener() {
        // public void onClick(DialogInterface dialog, int which) {
        // mClickedDialogEntryIndex = which;
        //
        // /*
        // * Clicking on an item simulates the positive button
        // * click, and dismisses the dialog.
        // */
        // NotificationIconListPreference.this.onClick(dialog, DialogInterface.BUTTON_POSITIVE);
        // dialog.dismiss();
        // }
        // });

        AdapterItems[] listViewItems = new AdapterItems[mEntries.length];
        for (int i = 0; i < mEntries.length; i++) {
            listViewItems[i] =
                    new AdapterItems(mEntries[i], ManageNotification.NOTIF_ICON_RES[i][0]);
        }

        builder.setSingleChoiceItems(
                new NotificationIconAdapter(
                        context,
                        R.layout.notification_icon_listview_row,
                        listViewItems,
                        selectedItemIndex),
                selectedItemIndex,
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        selectedItemIndex = which;

                        /*
                         * Clicking on an item simulates the positive button click, and dismisses
                         * the dialog.
                         */
                        NotificationIconListPreference.this.onClick(dialog,
                                DialogInterface.BUTTON_POSITIVE);
                        dialog.dismiss();
                    }
                }
                );

        /*
         * The typical interaction for list-based dialogs is to have click-on-an-item dismiss the
         * dialog instead of the user having to press 'Ok'.
         */
        builder.setPositiveButton(null, null);
    }

    @Override
    protected void onDialogClosed(boolean positiveResult) {
        super.onDialogClosed(positiveResult);

        if (positiveResult && selectedItemIndex >= 0 && mEntryValues != null) {
            String value = mEntryValues[selectedItemIndex].toString();
            if (callChangeListener(value)) {
                setValue(value);
            }
        }
    }

    @Override
    protected Object onGetDefaultValue(TypedArray a, int index) {
        return a.getString(index);
    }

    @Override
    protected void onSetInitialValue(boolean restoreValue, Object defaultValue) {
        setValue(restoreValue ? getPersistedString(mValue) : (String) defaultValue);
    }

    @Override
    protected Parcelable onSaveInstanceState() {
        final Parcelable superState = super.onSaveInstanceState();
        if (isPersistent()) {
            // No need to save instance state since it's persistent
            return superState;
        }

        final SavedState myState = new SavedState(superState);
        myState.value = getValue();
        return myState;
    }

    @Override
    protected void onRestoreInstanceState(Parcelable state) {
        if (state == null || !state.getClass().equals(SavedState.class)) {
            // Didn't save state for us in onSaveInstanceState
            super.onRestoreInstanceState(state);
            return;
        }

        SavedState myState = (SavedState) state;
        super.onRestoreInstanceState(myState.getSuperState());
        setValue(myState.value);
    }

    private static class SavedState extends BaseSavedState {
        String value;

        public SavedState(Parcel source) {
            super(source);
            value = source.readString();
        }

        @Override
        public void writeToParcel(Parcel dest, int flags) {
            super.writeToParcel(dest, flags);
            dest.writeString(value);
        }

        public SavedState(Parcelable superState) {
            super(superState);
        }

        @SuppressWarnings("unused")
		public static final Parcelable.Creator<SavedState> CREATOR =
                new Parcelable.Creator<SavedState>() {
                    public SavedState createFromParcel(Parcel in) {
                        return new SavedState(in);
                    }

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

    // Class to hold the text and icon res id in the adapter
    private class AdapterItems {
        public CharSequence text;
        public int iconRes;

        public AdapterItems(CharSequence _text, int _iconRes) {
            text = _text;
            iconRes = _iconRes;
        }
    }

    // View holder to references to the views
    private static class ViewHolder {
        CheckedTextView text;
        ImageView icon;
    }

    // Custom ArrayAdapter that inflates a custom view that has both text and an icon
    public class NotificationIconAdapter extends ArrayAdapter<AdapterItems> {
        private Context context;
        private int selected;
        private int viewResId;

        public NotificationIconAdapter(Context _context, int _viewResId, AdapterItems[] objects,
                int _selected) {
            super(_context, _viewResId, objects);
            context = _context;
            viewResId = _viewResId;
            selected = _selected;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            ViewHolder holder;

            // See if layout has already been inflated
            if (convertView == null) {

                // Inflate layout
                LayoutInflater inflater =
                        (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                convertView = inflater.inflate(viewResId, null);

                // Locate views and store in view holder
                holder = new ViewHolder();
                holder.text = (CheckedTextView) convertView.findViewById(android.R.id.text1);
                holder.icon = (ImageView) convertView.findViewById(android.R.id.icon);

                // Store in tag
                convertView.setTag(holder);

            } else {

                // Otherwise layout has already been inflated, get views from view holder
                holder = (ViewHolder) convertView.getTag();
            }

            // Set text and icon
            holder.text.setText(getItem(position).text);
            holder.icon.setImageResource(getItem(position).iconRes);

            // Set selected item
            if (position == selected) {
                holder.text.setChecked(true);
            } else {
                holder.text.setChecked(false);
            }

            return convertView;
        }
    }

}