/*
 * 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.internal.telephony.cdma;

import android.compat.annotation.UnsupportedAppUsage;
import android.content.Context;
import android.content.res.Resources;
import android.content.res.XmlResourceParser;
import android.os.PersistableBundle;
import android.telephony.CarrierConfigManager;
import android.util.Xml;

import com.android.internal.telephony.Phone;
import com.android.internal.telephony.util.XmlUtils;
import com.android.telephony.Rlog;

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.HashMap;

/**
 * EriManager loads the ERI file definitions and manages the CDMA roaming information.
 *
 */
public class EriManager {

    class EriFile {

        int mVersionNumber;                      // File version number
        int mNumberOfEriEntries;                 // Number of entries
        int mEriFileType;                        // Eri Phase 0/1
        //int mNumberOfIconImages;               // reserved for future use
        //int mIconImageType;                    // reserved for future use
        String[] mCallPromptId;                  // reserved for future use
        HashMap<Integer, EriInfo> mRoamIndTable; // Roaming Indicator Table

        EriFile() {
            mVersionNumber = -1;
            mNumberOfEriEntries = 0;
            mEriFileType = -1;
            mCallPromptId = new String[] { "", "", "" };
            mRoamIndTable = new HashMap<Integer, EriInfo>();
        }
    }

    class EriDisplayInformation {
        int mEriIconIndex;
        int mEriIconMode;
        @UnsupportedAppUsage
        String mEriIconText;

        EriDisplayInformation(int eriIconIndex, int eriIconMode, String eriIconText) {
            mEriIconIndex = eriIconIndex;
            mEriIconMode = eriIconMode;
            mEriIconText = eriIconText;
        }

//        public void setParameters(int eriIconIndex, int eriIconMode, String eriIconText){
//            mEriIconIndex = eriIconIndex;
//            mEriIconMode = eriIconMode;
//            mEriIconText = eriIconText;
//        }

        @Override
        public String toString() {
            return "EriDisplayInformation: {" + " IconIndex: " + mEriIconIndex + " EriIconMode: "
                    + mEriIconMode + " EriIconText: " + mEriIconText + " }";
        }
    }

    private static final String LOG_TAG = "EriManager";
    private static final boolean DBG = true;
    private static final boolean VDBG = false;

    public static final int ERI_FROM_XML   = 0;
    static final int ERI_FROM_FILE_SYSTEM  = 1;
    static final int ERI_FROM_MODEM        = 2;

    private Context mContext;
    private int mEriFileSource = ERI_FROM_XML;
    private boolean mIsEriFileLoaded;
    private EriFile mEriFile;
    private final Phone mPhone;

    public EriManager(Phone phone, int eriFileSource) {
        mPhone = phone;
        mContext = mPhone.getContext();
        mEriFileSource = eriFileSource;
        mEriFile = new EriFile();
    }

    public void dispose() {
        mEriFile = new EriFile();
        mIsEriFileLoaded = false;
    }


    public void loadEriFile() {
        switch (mEriFileSource) {
        case ERI_FROM_MODEM:
            loadEriFileFromModem();
            break;

        case ERI_FROM_FILE_SYSTEM:
            loadEriFileFromFileSystem();
            break;

        case ERI_FROM_XML:
        default:
            loadEriFileFromXml();
            break;
        }
    }

    /**
     * Load the ERI file from the MODEM through chipset specific RIL_REQUEST_OEM_HOOK
     *
     * In this case the ERI file can be updated from the Phone Support Tool available
     * from the Chipset vendor
     */
    private void loadEriFileFromModem() {
        // NOT IMPLEMENTED, Chipset vendor/Operator specific
    }

    /**
     * Load the ERI file from a File System file
     *
     * In this case the a Phone Support Tool to update the ERI file must be provided
     * to the Operator
     */
    private void loadEriFileFromFileSystem() {
        // NOT IMPLEMENTED, Chipset vendor/Operator specific
    }

    /**
     * Load the ERI file from the application framework resources encoded in XML
     *
     */
    private void loadEriFileFromXml() {
        XmlPullParser parser = null;
        FileInputStream stream = null;
        Resources r = mContext.getResources();

        try {
            if (DBG) Rlog.d(LOG_TAG, "loadEriFileFromXml: check for alternate file");
            stream = new FileInputStream(
                            r.getString(com.android.internal.R.string.alternate_eri_file));
            parser = Xml.newPullParser();
            parser.setInput(stream, null);
            if (DBG) Rlog.d(LOG_TAG, "loadEriFileFromXml: opened alternate file");
        } catch (FileNotFoundException e) {
            if (DBG) Rlog.d(LOG_TAG, "loadEriFileFromXml: no alternate file");
            parser = null;
        } catch (XmlPullParserException e) {
            if (DBG) Rlog.d(LOG_TAG, "loadEriFileFromXml: no parser for alternate file");
            parser = null;
        }

        if (parser == null) {
            String eriFile = null;

            CarrierConfigManager configManager = (CarrierConfigManager)
                    mContext.getSystemService(Context.CARRIER_CONFIG_SERVICE);
            if (configManager != null) {
                PersistableBundle b = configManager.getConfigForSubId(mPhone.getSubId());
                if (b != null) {
                    eriFile = b.getString(CarrierConfigManager.KEY_CARRIER_ERI_FILE_NAME_STRING);
                }
            }

            Rlog.d(LOG_TAG, "eriFile = " + eriFile);

            if (eriFile == null) {
                if (DBG) Rlog.e(LOG_TAG, "loadEriFileFromXml: Can't find ERI file to load");
                return;
            }

            try {
                parser = Xml.newPullParser();
                parser.setInput(mContext.getAssets().open(eriFile), null);
            } catch (IOException | XmlPullParserException e) {
                if (DBG) Rlog.e(LOG_TAG, "loadEriFileFromXml: no parser for " + eriFile +
                        ". Exception = " + e.toString());
            }
        }

        try {
            XmlUtils.beginDocument(parser, "EriFile");
            mEriFile.mVersionNumber = Integer.parseInt(
                    parser.getAttributeValue(null, "VersionNumber"));
            mEriFile.mNumberOfEriEntries = Integer.parseInt(
                    parser.getAttributeValue(null, "NumberOfEriEntries"));
            mEriFile.mEriFileType = Integer.parseInt(
                    parser.getAttributeValue(null, "EriFileType"));

            int parsedEriEntries = 0;
            while(true) {
                XmlUtils.nextElement(parser);
                String name = parser.getName();
                if (name == null) {
                    if (parsedEriEntries != mEriFile.mNumberOfEriEntries)
                        Rlog.e(LOG_TAG, "Error Parsing ERI file: " +  mEriFile.mNumberOfEriEntries
                                + " defined, " + parsedEriEntries + " parsed!");
                    break;
                } else if (name.equals("CallPromptId")) {
                    int id = Integer.parseInt(parser.getAttributeValue(null, "Id"));
                    String text = parser.getAttributeValue(null, "CallPromptText");
                    if (id >= 0 && id <= 2) {
                        mEriFile.mCallPromptId[id] = text;
                    } else {
                        Rlog.e(LOG_TAG, "Error Parsing ERI file: found" + id + " CallPromptId");
                    }

                } else if (name.equals("EriInfo")) {
                    int roamingIndicator = Integer.parseInt(
                            parser.getAttributeValue(null, "RoamingIndicator"));
                    int iconIndex = Integer.parseInt(parser.getAttributeValue(null, "IconIndex"));
                    int iconMode = Integer.parseInt(parser.getAttributeValue(null, "IconMode"));
                    String eriText = parser.getAttributeValue(null, "EriText");
                    int callPromptId = Integer.parseInt(
                            parser.getAttributeValue(null, "CallPromptId"));
                    int alertId = Integer.parseInt(parser.getAttributeValue(null, "AlertId"));
                    parsedEriEntries++;
                    mEriFile.mRoamIndTable.put(roamingIndicator, new EriInfo (roamingIndicator,
                            iconIndex, iconMode, eriText, callPromptId, alertId));
                }
            }

            Rlog.d(LOG_TAG, "loadEriFileFromXml: eri parsing successful, file loaded. ver = " +
                    mEriFile.mVersionNumber + ", # of entries = " + mEriFile.mNumberOfEriEntries);

            mIsEriFileLoaded = true;

        } catch (Exception e) {
            Rlog.e(LOG_TAG, "Got exception while loading ERI file.", e);
        } finally {
            if (parser instanceof XmlResourceParser) {
                ((XmlResourceParser)parser).close();
            }
            try {
                if (stream != null) {
                    stream.close();
                }
            } catch (IOException e) {
                // Ignore
            }
        }
    }

    /**
     * Returns the version of the ERI file
     *
     */
    public int getEriFileVersion() {
        return mEriFile.mVersionNumber;
    }

    /**
     * Returns the number of ERI entries parsed
     *
     */
    public int getEriNumberOfEntries() {
        return mEriFile.mNumberOfEriEntries;
    }

    /**
     * Returns the ERI file type value ( 0 for Phase 0, 1 for Phase 1)
     *
     */
    public int getEriFileType() {
        return mEriFile.mEriFileType;
    }

    /**
     * Returns if the ERI file has been loaded
     *
     */
    public boolean isEriFileLoaded() {
        return mIsEriFileLoaded;
    }

    /**
     * Returns the EriInfo record associated with roamingIndicator
     * or null if the entry is not found
     */
    private EriInfo getEriInfo(int roamingIndicator) {
        if (mEriFile.mRoamIndTable.containsKey(roamingIndicator)) {
            return mEriFile.mRoamIndTable.get(roamingIndicator);
        } else {
            return null;
        }
    }

    @UnsupportedAppUsage
    private EriDisplayInformation getEriDisplayInformation(int roamInd, int defRoamInd){
        EriDisplayInformation ret;

        // Carrier can use carrier config to customize any built-in roaming display indications
        if (mIsEriFileLoaded) {
            EriInfo eriInfo = getEriInfo(roamInd);
            if (eriInfo != null) {
                if (VDBG) Rlog.v(LOG_TAG, "ERI roamInd " + roamInd + " found in ERI file");
                ret = new EriDisplayInformation(
                        eriInfo.iconIndex,
                        eriInfo.iconMode,
                        eriInfo.eriText);
                return ret;
            }
        }

        switch (roamInd) {
        // Handling the standard roaming indicator (non-ERI)
        case EriInfo.ROAMING_INDICATOR_ON:
            ret = new EriDisplayInformation(
                    EriInfo.ROAMING_INDICATOR_ON,
                    EriInfo.ROAMING_ICON_MODE_NORMAL,
                    mContext.getText(com.android.internal.R.string.roamingText0).toString());
            break;

        case EriInfo.ROAMING_INDICATOR_OFF:
            ret = new EriDisplayInformation(
                    EriInfo.ROAMING_INDICATOR_OFF,
                    EriInfo.ROAMING_ICON_MODE_NORMAL,
                    mContext.getText(com.android.internal.R.string.roamingText1).toString());
            break;

        case EriInfo.ROAMING_INDICATOR_FLASH:
            ret = new EriDisplayInformation(
                    EriInfo.ROAMING_INDICATOR_FLASH,
                    EriInfo.ROAMING_ICON_MODE_FLASH,
                    mContext.getText(com.android.internal.R.string.roamingText2).toString());
            break;


        // Handling the standard ERI
        case 3:
            ret = new EriDisplayInformation(
                    roamInd,
                    EriInfo.ROAMING_ICON_MODE_NORMAL,
                    mContext.getText(com.android.internal.R.string.roamingText3).toString());
            break;

        case 4:
            ret = new EriDisplayInformation(
                    roamInd,
                    EriInfo.ROAMING_ICON_MODE_NORMAL,
                    mContext.getText(com.android.internal.R.string.roamingText4).toString());
            break;

        case 5:
            ret = new EriDisplayInformation(
                    roamInd,
                    EriInfo.ROAMING_ICON_MODE_NORMAL,
                    mContext.getText(com.android.internal.R.string.roamingText5).toString());
            break;

        case 6:
            ret = new EriDisplayInformation(
                    roamInd,
                    EriInfo.ROAMING_ICON_MODE_NORMAL,
                    mContext.getText(com.android.internal.R.string.roamingText6).toString());
            break;

        case 7:
            ret = new EriDisplayInformation(
                    roamInd,
                    EriInfo.ROAMING_ICON_MODE_NORMAL,
                    mContext.getText(com.android.internal.R.string.roamingText7).toString());
            break;

        case 8:
            ret = new EriDisplayInformation(
                    roamInd,
                    EriInfo.ROAMING_ICON_MODE_NORMAL,
                    mContext.getText(com.android.internal.R.string.roamingText8).toString());
            break;

        case 9:
            ret = new EriDisplayInformation(
                    roamInd,
                    EriInfo.ROAMING_ICON_MODE_NORMAL,
                    mContext.getText(com.android.internal.R.string.roamingText9).toString());
            break;

        case 10:
            ret = new EriDisplayInformation(
                    roamInd,
                    EriInfo.ROAMING_ICON_MODE_NORMAL,
                    mContext.getText(com.android.internal.R.string.roamingText10).toString());
            break;

        case 11:
            ret = new EriDisplayInformation(
                    roamInd,
                    EriInfo.ROAMING_ICON_MODE_NORMAL,
                    mContext.getText(com.android.internal.R.string.roamingText11).toString());
            break;

        case 12:
            ret = new EriDisplayInformation(
                    roamInd,
                    EriInfo.ROAMING_ICON_MODE_NORMAL,
                    mContext.getText(com.android.internal.R.string.roamingText12).toString());
            break;

        // Handling the non standard Enhanced Roaming Indicator (roamInd > 63)
        default:
            if (!mIsEriFileLoaded) {
                // ERI file NOT loaded
                if (DBG) Rlog.d(LOG_TAG, "ERI File not loaded");
                if(defRoamInd > 2) {
                    if (VDBG) Rlog.v(LOG_TAG, "ERI defRoamInd > 2 ...flashing");
                    ret = new EriDisplayInformation(
                            EriInfo.ROAMING_INDICATOR_FLASH,
                            EriInfo.ROAMING_ICON_MODE_FLASH,
                            mContext.getText(com.android.internal
                                                            .R.string.roamingText2).toString());
                } else {
                    if (VDBG) Rlog.v(LOG_TAG, "ERI defRoamInd <= 2");
                    switch (defRoamInd) {
                    case EriInfo.ROAMING_INDICATOR_ON:
                        ret = new EriDisplayInformation(
                                EriInfo.ROAMING_INDICATOR_ON,
                                EriInfo.ROAMING_ICON_MODE_NORMAL,
                                mContext.getText(com.android.internal
                                                            .R.string.roamingText0).toString());
                        break;

                    case EriInfo.ROAMING_INDICATOR_OFF:
                        ret = new EriDisplayInformation(
                                EriInfo.ROAMING_INDICATOR_OFF,
                                EriInfo.ROAMING_ICON_MODE_NORMAL,
                                mContext.getText(com.android.internal
                                                            .R.string.roamingText1).toString());
                        break;

                    case EriInfo.ROAMING_INDICATOR_FLASH:
                        ret = new EriDisplayInformation(
                                EriInfo.ROAMING_INDICATOR_FLASH,
                                EriInfo.ROAMING_ICON_MODE_FLASH,
                                mContext.getText(com.android.internal
                                                            .R.string.roamingText2).toString());
                        break;

                    default:
                        ret = new EriDisplayInformation(-1, -1, "ERI text");
                    }
                }
            } else {
                // ERI file loaded
                EriInfo eriInfo = getEriInfo(roamInd);
                EriInfo defEriInfo = getEriInfo(defRoamInd);
                if (eriInfo == null) {
                    if (VDBG) {
                        Rlog.v(LOG_TAG, "ERI roamInd " + roamInd
                            + " not found in ERI file ...using defRoamInd " + defRoamInd);
                    }
                    if(defEriInfo == null) {
                        Rlog.e(LOG_TAG, "ERI defRoamInd " + defRoamInd
                                + " not found in ERI file ...on");
                        ret = new EriDisplayInformation(
                                EriInfo.ROAMING_INDICATOR_ON,
                                EriInfo.ROAMING_ICON_MODE_NORMAL,
                                mContext.getText(com.android.internal
                                                             .R.string.roamingText0).toString());

                    } else {
                        if (VDBG) {
                            Rlog.v(LOG_TAG, "ERI defRoamInd " + defRoamInd + " found in ERI file");
                        }
                        ret = new EriDisplayInformation(
                                defEriInfo.iconIndex,
                                defEriInfo.iconMode,
                                defEriInfo.eriText);
                    }
                } else {
                    if (VDBG) Rlog.v(LOG_TAG, "ERI roamInd " + roamInd + " found in ERI file");
                    ret = new EriDisplayInformation(
                            eriInfo.iconIndex,
                            eriInfo.iconMode,
                            eriInfo.eriText);
                }
            }
            break;
        }
        if (VDBG) Rlog.v(LOG_TAG, "Displaying ERI " + ret.toString());
        return ret;
    }

    public int getCdmaEriIconIndex(int roamInd, int defRoamInd){
        return getEriDisplayInformation(roamInd, defRoamInd).mEriIconIndex;
    }

    public int getCdmaEriIconMode(int roamInd, int defRoamInd){
        return getEriDisplayInformation(roamInd, defRoamInd).mEriIconMode;
    }

    public String getCdmaEriText(int roamInd, int defRoamInd){
        return getEriDisplayInformation(roamInd, defRoamInd).mEriIconText;
    }
}