/*
 * 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 android.net.wifi;

import android.os.Parcelable;
import android.os.Parcel;
import android.net.NetworkInfo.DetailedState;
import android.net.NetworkUtils;
import android.text.TextUtils;

import java.net.InetAddress;
import java.net.Inet4Address;
import java.net.UnknownHostException;
import java.util.EnumMap;

/**
 * Describes the state of any Wifi connection that is active or
 * is in the process of being set up.
 */
public class WifiInfo implements Parcelable {
    private static final String TAG = "WifiInfo";
    /**
     * This is the map described in the Javadoc comment above. The positions
     * of the elements of the array must correspond to the ordinal values
     * of <code>DetailedState</code>.
     */
    private static final EnumMap<SupplicantState, DetailedState> stateMap =
        new EnumMap<SupplicantState, DetailedState>(SupplicantState.class);

    static {
        stateMap.put(SupplicantState.DISCONNECTED, DetailedState.DISCONNECTED);
        stateMap.put(SupplicantState.INTERFACE_DISABLED, DetailedState.DISCONNECTED);
        stateMap.put(SupplicantState.INACTIVE, DetailedState.IDLE);
        stateMap.put(SupplicantState.SCANNING, DetailedState.SCANNING);
        stateMap.put(SupplicantState.AUTHENTICATING, DetailedState.CONNECTING);
        stateMap.put(SupplicantState.ASSOCIATING, DetailedState.CONNECTING);
        stateMap.put(SupplicantState.ASSOCIATED, DetailedState.CONNECTING);
        stateMap.put(SupplicantState.FOUR_WAY_HANDSHAKE, DetailedState.AUTHENTICATING);
        stateMap.put(SupplicantState.GROUP_HANDSHAKE, DetailedState.AUTHENTICATING);
        stateMap.put(SupplicantState.COMPLETED, DetailedState.OBTAINING_IPADDR);
        stateMap.put(SupplicantState.DORMANT, DetailedState.DISCONNECTED);
        stateMap.put(SupplicantState.UNINITIALIZED, DetailedState.IDLE);
        stateMap.put(SupplicantState.INVALID, DetailedState.FAILED);
    }

    private SupplicantState mSupplicantState;
    private String mBSSID;
    private WifiSsid mWifiSsid;
    private int mNetworkId;
    private boolean mHiddenSSID;
    /** Received Signal Strength Indicator */
    private int mRssi;

    /** Link speed in Mbps */
    public static final String LINK_SPEED_UNITS = "Mbps";
    private int mLinkSpeed;

    private InetAddress mIpAddress;
    private String mMacAddress;

    /**
     * Flag indicating that AP has hinted that upstream connection is metered,
     * and sensitive to heavy data transfers.
     */
    private boolean mMeteredHint;

    WifiInfo() {
        mWifiSsid = null;
        mBSSID = null;
        mNetworkId = -1;
        mSupplicantState = SupplicantState.UNINITIALIZED;
        mRssi = -9999;
        mLinkSpeed = -1;
        mHiddenSSID = false;
    }

    /**
     * Copy constructor
     * @hide
     */
    public WifiInfo(WifiInfo source) {
        if (source != null) {
            mSupplicantState = source.mSupplicantState;
            mBSSID = source.mBSSID;
            mWifiSsid = source.mWifiSsid;
            mNetworkId = source.mNetworkId;
            mHiddenSSID = source.mHiddenSSID;
            mRssi = source.mRssi;
            mLinkSpeed = source.mLinkSpeed;
            mIpAddress = source.mIpAddress;
            mMacAddress = source.mMacAddress;
            mMeteredHint = source.mMeteredHint;
        }
    }

    void setSSID(WifiSsid wifiSsid) {
        mWifiSsid = wifiSsid;
        // network is considered not hidden by default
        mHiddenSSID = false;
    }

    /**
     * Returns the service set identifier (SSID) of the current 802.11 network.
     * If the SSID can be decoded as UTF-8, it will be returned surrounded by double
     * quotation marks. Otherwise, it is returned as a string of hex digits. The
     * SSID may be {@code null} if there is no network currently connected.
     * @return the SSID
     */
    public String getSSID() {
        if (mWifiSsid != null) {
            String unicode = mWifiSsid.toString();
            if (!TextUtils.isEmpty(unicode)) {
                return "\"" + unicode + "\"";
            } else {
                return mWifiSsid.getHexString();
            }
        }
        return WifiSsid.NONE;
    }

    /** @hide */
    public WifiSsid getWifiSsid() {
        return mWifiSsid;
    }

    void setBSSID(String BSSID) {
        mBSSID = BSSID;
    }

    /**
     * Return the basic service set identifier (BSSID) of the current access point.
     * The BSSID may be {@code null} if there is no network currently connected.
     * @return the BSSID, in the form of a six-byte MAC address: {@code XX:XX:XX:XX:XX:XX}
     */
    public String getBSSID() {
        return mBSSID;
    }

    /**
     * Returns the received signal strength indicator of the current 802.11
     * network.
     * <p><strong>This is not normalized, but should be!</strong></p>
     * @return the RSSI, in the range ??? to ???
     */
    public int getRssi() {
        return mRssi;
    }

    void setRssi(int rssi) {
        mRssi = rssi;
    }

    /**
     * Returns the current link speed in {@link #LINK_SPEED_UNITS}.
     * @return the link speed.
     * @see #LINK_SPEED_UNITS
     */
    public int getLinkSpeed() {
        return mLinkSpeed;
    }

    void setLinkSpeed(int linkSpeed) {
        this.mLinkSpeed = linkSpeed;
    }

    /**
     * Record the MAC address of the WLAN interface
     * @param macAddress the MAC address in {@code XX:XX:XX:XX:XX:XX} form
     */
    void setMacAddress(String macAddress) {
        this.mMacAddress = macAddress;
    }

    public String getMacAddress() {
        return mMacAddress;
    }

    /** {@hide} */
    public void setMeteredHint(boolean meteredHint) {
        mMeteredHint = meteredHint;
    }

    /** {@hide} */
    public boolean getMeteredHint() {
        return mMeteredHint;
    }

    void setNetworkId(int id) {
        mNetworkId = id;
    }

    /**
     * Each configured network has a unique small integer ID, used to identify
     * the network when performing operations on the supplicant. This method
     * returns the ID for the currently connected network.
     * @return the network ID, or -1 if there is no currently connected network
     */
    public int getNetworkId() {
        return mNetworkId;
    }

    /**
     * Return the detailed state of the supplicant's negotiation with an
     * access point, in the form of a {@link SupplicantState SupplicantState} object.
     * @return the current {@link SupplicantState SupplicantState}
     */
    public SupplicantState getSupplicantState() {
        return mSupplicantState;
    }

    void setSupplicantState(SupplicantState state) {
        mSupplicantState = state;
    }

    void setInetAddress(InetAddress address) {
        mIpAddress = address;
    }

    public int getIpAddress() {
        int result = 0;
        if (mIpAddress instanceof Inet4Address) {
            result = NetworkUtils.inetAddressToInt((Inet4Address)mIpAddress);
        }
        return result;
    }

    /**
     * @return {@code true} if this network does not broadcast its SSID, so an
     * SSID-specific probe request must be used for scans.
     */
    public boolean getHiddenSSID() {
        return mHiddenSSID;
    }

    /** {@hide} */
    public void setHiddenSSID(boolean hiddenSSID) {
        mHiddenSSID = hiddenSSID;
    }

   /**
     * Map a supplicant state into a fine-grained network connectivity state.
     * @param suppState the supplicant state
     * @return the corresponding {@link DetailedState}
     */
    public static DetailedState getDetailedStateOf(SupplicantState suppState) {
        return stateMap.get(suppState);
    }

    /**
     * Set the <code>SupplicantState</code> from the string name
     * of the state.
     * @param stateName the name of the state, as a <code>String</code> returned
     * in an event sent by {@code wpa_supplicant}.
     */
    void setSupplicantState(String stateName) {
        mSupplicantState = valueOf(stateName);
    }

    static SupplicantState valueOf(String stateName) {
        if ("4WAY_HANDSHAKE".equalsIgnoreCase(stateName))
            return SupplicantState.FOUR_WAY_HANDSHAKE;
        else {
            try {
                return SupplicantState.valueOf(stateName.toUpperCase());
            } catch (IllegalArgumentException e) {
                return SupplicantState.INVALID;
            }
        }
    }

    /** {@hide} */
    public static String removeDoubleQuotes(String string) {
        if (string == null) return null;
        final int length = string.length();
        if ((length > 1) && (string.charAt(0) == '"') && (string.charAt(length - 1) == '"')) {
            return string.substring(1, length - 1);
        }
        return string;
    }

    @Override
    public String toString() {
        StringBuffer sb = new StringBuffer();
        String none = "<none>";

        sb.append("SSID: ").append(mWifiSsid == null ? WifiSsid.NONE : mWifiSsid).
            append(", BSSID: ").append(mBSSID == null ? none : mBSSID).
            append(", MAC: ").append(mMacAddress == null ? none : mMacAddress).
            append(", Supplicant state: ").
            append(mSupplicantState == null ? none : mSupplicantState).
            append(", RSSI: ").append(mRssi).
            append(", Link speed: ").append(mLinkSpeed).
            append(", Net ID: ").append(mNetworkId).
            append(", Metered hint: ").append(mMeteredHint);

        return sb.toString();
    }

    /** Implement the Parcelable interface {@hide} */
    public int describeContents() {
        return 0;
    }

    /** Implement the Parcelable interface {@hide} */
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeInt(mNetworkId);
        dest.writeInt(mRssi);
        dest.writeInt(mLinkSpeed);
        if (mIpAddress != null) {
            dest.writeByte((byte)1);
            dest.writeByteArray(mIpAddress.getAddress());
        } else {
            dest.writeByte((byte)0);
        }
        if (mWifiSsid != null) {
            dest.writeInt(1);
            mWifiSsid.writeToParcel(dest, flags);
        } else {
            dest.writeInt(0);
        }
        dest.writeString(mBSSID);
        dest.writeString(mMacAddress);
        dest.writeInt(mMeteredHint ? 1 : 0);
        mSupplicantState.writeToParcel(dest, flags);
    }

    /** Implement the Parcelable interface {@hide} */
    public static final Creator<WifiInfo> CREATOR =
        new Creator<WifiInfo>() {
            public WifiInfo createFromParcel(Parcel in) {
                WifiInfo info = new WifiInfo();
                info.setNetworkId(in.readInt());
                info.setRssi(in.readInt());
                info.setLinkSpeed(in.readInt());
                if (in.readByte() == 1) {
                    try {
                        info.setInetAddress(InetAddress.getByAddress(in.createByteArray()));
                    } catch (UnknownHostException e) {}
                }
                if (in.readInt() == 1) {
                    info.mWifiSsid = WifiSsid.CREATOR.createFromParcel(in);
                }
                info.mBSSID = in.readString();
                info.mMacAddress = in.readString();
                info.mMeteredHint = in.readInt() != 0;
                info.mSupplicantState = SupplicantState.CREATOR.createFromParcel(in);
                return info;
            }

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