/*
 * Copyright (C) 2014 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.systemui.qs.tiles;

import static com.android.settingslib.graph.BluetoothDeviceLayerDrawable.createLayerDrawable;

import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothProfile;
import android.content.Context;
import android.content.Intent;
import android.graphics.drawable.Drawable;
import android.provider.Settings;
import android.service.quicksettings.Tile;
import android.text.TextUtils;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Switch;

import com.android.internal.logging.MetricsLogger;
import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
import com.android.settingslib.Utils;
import com.android.settingslib.bluetooth.CachedBluetoothDevice;
import com.android.systemui.Dependency;
import com.android.systemui.R;
import com.android.systemui.plugins.ActivityStarter;
import com.android.systemui.plugins.qs.DetailAdapter;
import com.android.systemui.plugins.qs.QSTile.BooleanState;
import com.android.systemui.qs.QSDetailItems;
import com.android.systemui.qs.QSDetailItems.Item;
import com.android.systemui.qs.QSHost;
import com.android.systemui.qs.tileimpl.QSTileImpl;
import com.android.systemui.statusbar.policy.BluetoothController;

import java.util.ArrayList;
import java.util.Collection;

/** Quick settings tile: Bluetooth **/
public class BluetoothTile extends QSTileImpl<BooleanState> {
    private static final Intent BLUETOOTH_SETTINGS = new Intent(Settings.ACTION_BLUETOOTH_SETTINGS);

    private final BluetoothController mController;
    private final BluetoothDetailAdapter mDetailAdapter;
    private final ActivityStarter mActivityStarter;

    public BluetoothTile(QSHost host) {
        super(host);
        mController = Dependency.get(BluetoothController.class);
        mActivityStarter = Dependency.get(ActivityStarter.class);
        mDetailAdapter = (BluetoothDetailAdapter) createDetailAdapter();
    }

    @Override
    public DetailAdapter getDetailAdapter() {
        return mDetailAdapter;
    }

    @Override
    public BooleanState newTileState() {
        return new BooleanState();
    }

    @Override
    public void handleSetListening(boolean listening) {
        if (listening) {
            mController.addCallback(mCallback);
        } else {
            mController.removeCallback(mCallback);
        }
    }

    @Override
    protected void handleClick() {
        // Secondary clicks are header clicks, just toggle.
        final boolean isEnabled = mState.value;
        mController.setBluetoothEnabled(!isEnabled);
    }

    @Override
    public Intent getLongClickIntent() {
        return new Intent(Settings.ACTION_BLUETOOTH_SETTINGS);
    }

    @Override
    protected void handleSecondaryClick() {
        if (!mController.canConfigBluetooth()) {
            mActivityStarter.postStartActivityDismissingKeyguard(
                    new Intent(Settings.ACTION_BLUETOOTH_SETTINGS), 0);
            return;
        }
        showDetail(true);
        if (!mState.value) {
            mController.setBluetoothEnabled(true);
        }
    }

    @Override
    public CharSequence getTileLabel() {
        return mContext.getString(R.string.quick_settings_bluetooth_label);
    }

    @Override
    protected void handleUpdateState(BooleanState state, Object arg) {
        final boolean enabled = mController.isBluetoothEnabled();
        final boolean connected = mController.isBluetoothConnected();
        state.isTransient = mController.isBluetoothConnecting()
                || mController.getBluetoothState() == BluetoothAdapter.STATE_TURNING_ON;
        state.dualTarget = true;
        state.value = enabled;
        if (state.slash == null) {
            state.slash = new SlashState();
        }
        state.slash.isSlashed = !enabled;
        if (enabled) {
            state.label = null;
            if (connected) {
                state.icon = ResourceIcon.get(R.drawable.ic_qs_bluetooth_connected);
                state.label = mController.getLastDeviceName();
                CachedBluetoothDevice lastDevice = mController.getLastDevice();
                if (lastDevice != null) {
                    int batteryLevel = lastDevice.getBatteryLevel();
                    if (batteryLevel != BluetoothDevice.BATTERY_LEVEL_UNKNOWN) {
                        state.icon = new BluetoothBatteryTileIcon(lastDevice,
                                mContext.getResources().getFraction(
                                        R.fraction.bt_battery_scale_fraction, 1, 1));
                    }
                }
                state.contentDescription = mContext.getString(
                        R.string.accessibility_bluetooth_name, state.label);
            } else if (state.isTransient) {
                state.icon = ResourceIcon.get(R.drawable.ic_bluetooth_transient_animation);
                state.contentDescription = mContext.getString(
                        R.string.accessibility_quick_settings_bluetooth_connecting);
                state.label = mContext.getString(R.string.quick_settings_bluetooth_label);
            } else {
                state.icon = ResourceIcon.get(R.drawable.ic_qs_bluetooth_on);
                state.contentDescription = mContext.getString(
                        R.string.accessibility_quick_settings_bluetooth_on) + ","
                        + mContext.getString(R.string.accessibility_not_connected);
            }
            if (TextUtils.isEmpty(state.label)) {
                state.label = mContext.getString(R.string.quick_settings_bluetooth_label);
            }
            state.state = Tile.STATE_ACTIVE;
        } else {
            state.icon = ResourceIcon.get(R.drawable.ic_qs_bluetooth_on);
            state.label = mContext.getString(R.string.quick_settings_bluetooth_label);
            state.contentDescription = mContext.getString(
                    R.string.accessibility_quick_settings_bluetooth_off);
            state.state = Tile.STATE_INACTIVE;
        }

        state.dualLabelContentDescription = mContext.getResources().getString(
                R.string.accessibility_quick_settings_open_settings, getTileLabel());
        state.expandedAccessibilityClassName = Switch.class.getName();
    }

    @Override
    public int getMetricsCategory() {
        return MetricsEvent.QS_BLUETOOTH;
    }

    @Override
    protected String composeChangeAnnouncement() {
        if (mState.value) {
            return mContext.getString(R.string.accessibility_quick_settings_bluetooth_changed_on);
        } else {
            return mContext.getString(R.string.accessibility_quick_settings_bluetooth_changed_off);
        }
    }

    @Override
    public boolean isAvailable() {
        return mController.isBluetoothSupported();
    }

    private final BluetoothController.Callback mCallback = new BluetoothController.Callback() {
        @Override
        public void onBluetoothStateChange(boolean enabled) {
            refreshState();
            if (isShowingDetail()) {
                mDetailAdapter.updateItems();
                fireToggleStateChanged(mDetailAdapter.getToggleState());
            }
        }

        @Override
        public void onBluetoothDevicesChanged() {
            refreshState();
            if (isShowingDetail()) {
                mDetailAdapter.updateItems();
            }
        }
    };

    @Override
    protected DetailAdapter createDetailAdapter() {
        return new BluetoothDetailAdapter();
    }

    private class BluetoothBatteryTileIcon extends Icon {
        private float mIconScale;
        private CachedBluetoothDevice mDevice;

        BluetoothBatteryTileIcon(CachedBluetoothDevice device, float iconScale) {
            mIconScale = iconScale;
            mDevice = device;
        }

        @Override
        public Drawable getDrawable(Context context) {
            // This method returns Pair<Drawable, String> while first value is the drawable
            return com.android.settingslib.bluetooth.Utils.getBtClassDrawableWithDescription(
                    context, mDevice, mIconScale).first;
        }
    }

    protected class BluetoothDetailAdapter implements DetailAdapter, QSDetailItems.Callback {
        // We probably won't ever have space in the UI for more than 20 devices, so don't
        // get info for them.
        private static final int MAX_DEVICES = 20;
        private QSDetailItems mItems;

        @Override
        public CharSequence getTitle() {
            return mContext.getString(R.string.quick_settings_bluetooth_label);
        }

        @Override
        public Boolean getToggleState() {
            return mState.value;
        }

        @Override
        public boolean getToggleEnabled() {
            return mController.getBluetoothState() == BluetoothAdapter.STATE_OFF
                    || mController.getBluetoothState() == BluetoothAdapter.STATE_ON;
        }

        @Override
        public Intent getSettingsIntent() {
            return BLUETOOTH_SETTINGS;
        }

        @Override
        public void setToggleState(boolean state) {
            MetricsLogger.action(mContext, MetricsEvent.QS_BLUETOOTH_TOGGLE, state);
            mController.setBluetoothEnabled(state);
        }

        @Override
        public int getMetricsCategory() {
            return MetricsEvent.QS_BLUETOOTH_DETAILS;
        }

        @Override
        public View createDetailView(Context context, View convertView, ViewGroup parent) {
            mItems = QSDetailItems.convertOrInflate(context, convertView, parent);
            mItems.setTagSuffix("Bluetooth");
            mItems.setCallback(this);
            updateItems();
            setItemsVisible(mState.value);
            return mItems;
        }

        public void setItemsVisible(boolean visible) {
            if (mItems == null) return;
            mItems.setItemsVisible(visible);
        }

        private void updateItems() {
            if (mItems == null) return;
            if (mController.isBluetoothEnabled()) {
                mItems.setEmptyState(R.drawable.ic_qs_bluetooth_detail_empty,
                        R.string.quick_settings_bluetooth_detail_empty_text);
            } else {
                mItems.setEmptyState(R.drawable.ic_qs_bluetooth_detail_empty,
                        R.string.bt_is_off);
            }
            ArrayList<Item> items = new ArrayList<Item>();
            final Collection<CachedBluetoothDevice> devices = mController.getDevices();
            if (devices != null) {
                int connectedDevices = 0;
                int count = 0;
                for (CachedBluetoothDevice device : devices) {
                    if (mController.getBondState(device) == BluetoothDevice.BOND_NONE) continue;
                    final Item item = new Item();
                    item.iconResId = R.drawable.ic_qs_bluetooth_on;
                    item.line1 = device.getName();
                    item.tag = device;
                    int state = device.getMaxConnectionState();
                    if (state == BluetoothProfile.STATE_CONNECTED) {
                        item.iconResId = R.drawable.ic_qs_bluetooth_connected;
                        int batteryLevel = device.getBatteryLevel();
                        if (batteryLevel != BluetoothDevice.BATTERY_LEVEL_UNKNOWN) {
                            item.icon = new BluetoothBatteryTileIcon(device,
                                    1 /* iconScale */);
                            item.line2 = mContext.getString(
                                    R.string.quick_settings_connected_battery_level,
                                    Utils.formatPercentage(batteryLevel));
                        } else {
                            item.line2 = mContext.getString(R.string.quick_settings_connected);
                        }
                        item.canDisconnect = true;
                        items.add(connectedDevices, item);
                        connectedDevices++;
                    } else if (state == BluetoothProfile.STATE_CONNECTING) {
                        item.iconResId = R.drawable.ic_qs_bluetooth_connecting;
                        item.line2 = mContext.getString(R.string.quick_settings_connecting);
                        items.add(connectedDevices, item);
                    } else {
                        items.add(item);
                    }
                    if (++count == MAX_DEVICES) {
                        break;
                    }
                }
            }
            mItems.setItems(items.toArray(new Item[items.size()]));
        }

        @Override
        public void onDetailItemClick(Item item) {
            if (item == null || item.tag == null) return;
            final CachedBluetoothDevice device = (CachedBluetoothDevice) item.tag;
            if (device != null && device.getMaxConnectionState()
                    == BluetoothProfile.STATE_DISCONNECTED) {
                mController.connect(device);
            }
        }

        @Override
        public void onDetailItemDisconnect(Item item) {
            if (item == null || item.tag == null) return;
            final CachedBluetoothDevice device = (CachedBluetoothDevice) item.tag;
            if (device != null) {
                mController.disconnect(device);
            }
        }
    }
}