/*
 * Copyright (C) 2008 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.settings.bluetooth;

import com.android.settings.R;

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.preference.Preference;
import android.util.TypedValue;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.ImageView;

import com.android.settings.bluetooth.LocalBluetoothProfileManager.Profile;

import java.util.Map;

/**
 * BluetoothDevicePreference is the preference type used to display each remote
 * Bluetooth device in the Bluetooth Settings screen.
 */
public class BluetoothDevicePreference extends Preference implements
        CachedBluetoothDevice.Callback, OnClickListener {
    private static final String TAG = "BluetoothDevicePreference";

    private static int sDimAlpha = Integer.MIN_VALUE;

    private final CachedBluetoothDevice mCachedDevice;

    private ImageView mDeviceSettings;

    private OnClickListener mOnSettingsClickListener;

    /**
     * Cached local copy of whether the device is busy. This is only updated
     * from {@link #onDeviceAttributesChanged()}.
     */
    private boolean mIsBusy;

    public BluetoothDevicePreference(Context context, CachedBluetoothDevice cachedDevice) {
        super(context);

        if (sDimAlpha == Integer.MIN_VALUE) {
            TypedValue outValue = new TypedValue();
            context.getTheme().resolveAttribute(android.R.attr.disabledAlpha, outValue, true);
            sDimAlpha = (int) (outValue.getFloat() * 255);
        }

        mCachedDevice = cachedDevice;

        setWidgetLayoutResource(R.layout.preference_bluetooth);

        cachedDevice.registerCallback(this);

        onDeviceAttributesChanged();
    }

    public CachedBluetoothDevice getCachedDevice() {
        return mCachedDevice;
    }

    public void setOnSettingsClickListener(OnClickListener listener) {
        mOnSettingsClickListener = listener;
    }

    @Override
    protected void onPrepareForRemoval() {
        super.onPrepareForRemoval();
        mCachedDevice.unregisterCallback(this);
    }

    public void onDeviceAttributesChanged() {

        /*
         * The preference framework takes care of making sure the value has
         * changed before proceeding.
         */

        setTitle(mCachedDevice.getName());

        /*
         * TODO: Showed "Paired" even though it was "Connected". This may be
         * related to BluetoothHeadset not bound to the actual
         * BluetoothHeadsetService when we got here.
         */
        setSummary(mCachedDevice.getSummary());

        // Used to gray out the item
        mIsBusy = mCachedDevice.isBusy();

        // Data has changed
        notifyChanged();

        // This could affect ordering, so notify that also
        notifyHierarchyChanged();
    }

    @Override
    public boolean isEnabled() {
        // Temp fix until we have 2053751 fixed in the framework
        setEnabled(true);
        return super.isEnabled() && !mIsBusy;
    }

    @Override
    protected void onBindView(View view) {
        // Disable this view if the bluetooth enable/disable preference view is off
        if (null != findPreferenceInHierarchy("bt_checkbox")) {
            setDependency("bt_checkbox");
        }

        super.onBindView(view);

        ImageView btClass = (ImageView) view.findViewById(android.R.id.icon);
        btClass.setImageResource(mCachedDevice.getBtClassDrawable());
        btClass.setAlpha(!mIsBusy ? 255 : sDimAlpha);

        mDeviceSettings = (ImageView) view.findViewById(R.id.deviceDetails);
        if (mOnSettingsClickListener != null) {
            mDeviceSettings.setOnClickListener(this);
            mDeviceSettings.setTag(mCachedDevice);
            mDeviceSettings.setAlpha(!mIsBusy ? 255 : sDimAlpha);
        } else { // Hide the settings icon and divider
            mDeviceSettings.setVisibility(View.GONE);
            ImageView divider = (ImageView) view.findViewById(R.id.divider);
            if (divider != null) {
                divider.setVisibility(View.GONE);
            }
        }

        LayoutInflater inflater = (LayoutInflater)
                getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        ViewGroup profilesGroup = (ViewGroup) view.findViewById(R.id.profileIcons);
        Map<Profile, Drawable> profileIcons = mCachedDevice.getProfileIcons();
        for (Profile profile : profileIcons.keySet()) {
            Drawable icon = profileIcons.get(profile);
            inflater.inflate(R.layout.profile_icon_small, profilesGroup, true);
            ImageView imageView =
                    (ImageView) profilesGroup.getChildAt(profilesGroup.getChildCount() - 1);
            imageView.setImageDrawable(icon);
            boolean profileEnabled = mCachedDevice.isConnectedProfile(profile);
            imageView.setAlpha(profileEnabled ? 255 : sDimAlpha);
        }
    }

    public void onClick(View v) {
        if (v == mDeviceSettings) {
            if (mOnSettingsClickListener != null) mOnSettingsClickListener.onClick(v);
        }
    }

    @Override
    public int compareTo(Preference another) {
        if (!(another instanceof BluetoothDevicePreference)) {
            // Put other preference types above us
            return 1;
        }

        return mCachedDevice.compareTo(((BluetoothDevicePreference) another).mCachedDevice);
    }

}