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/*
 * Copyright (C) 2007 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.content.pm;

import android.content.pm.PackageManager.NameNotFoundException;
import android.content.res.Resources;
import android.graphics.drawable.Drawable;
import android.os.Parcel;
import android.os.Parcelable;
import android.util.Printer;

import java.text.Collator;
import java.util.Comparator;

/**
 * Information you can retrieve about a particular application.  This
 * corresponds to information collected from the AndroidManifest.xml's
 * <application> tag.
 */
public class ApplicationInfo extends PackageItemInfo implements Parcelable {
    
    /**
     * Default task affinity of all activities in this application. See 
     * {@link ActivityInfo#taskAffinity} for more information.  This comes 
     * from the "taskAffinity" attribute. 
     */
    public String taskAffinity;
    
    /**
     * Optional name of a permission required to be able to access this
     * application's components.  From the "permission" attribute.
     */
    public String permission;
    
    /**
     * The name of the process this application should run in.  From the
     * "process" attribute or, if not set, the same as
     * <var>packageName</var>.
     */
    public String processName;
    
    /**
     * Class implementing the Application object.  From the "class"
     * attribute.
     */
    public String className;
    
    /**
     * A style resource identifier (in the package's resources) of the
     * description of an application.  From the "description" attribute
     * or, if not set, 0.
     */
    public int descriptionRes;    
    
    /**
     * A style resource identifier (in the package's resources) of the
     * default visual theme of the application.  From the "theme" attribute
     * or, if not set, 0.
     */
    public int theme;
    
    /**
     * Class implementing the Application's manage space
     * functionality.  From the "manageSpaceActivity"
     * attribute. This is an optional attribute and will be null if
     * applications don't specify it in their manifest
     */
    public String manageSpaceActivityName;    
    
    /**
     * Class implementing the Application's backup functionality.  From
     * the "backupAgent" attribute.  This is an optional attribute and
     * will be null if the application does not specify it in its manifest.
     * 
     * <p>If android:allowBackup is set to false, this attribute is ignored.
     */
    public String backupAgentName;
    
    /**
     * Value for {@link #flags}: if set, this application is installed in the
     * device's system image.
     */
    public static final int FLAG_SYSTEM = 1<<0;
    
    /**
     * Value for {@link #flags}: set to true if this application would like to
     * allow debugging of its
     * code, even when installed on a non-development system.  Comes
     * from {@link android.R.styleable#AndroidManifestApplication_debuggable
     * android:debuggable} of the &lt;application&gt; tag.
     */
    public static final int FLAG_DEBUGGABLE = 1<<1;
    
    /**
     * Value for {@link #flags}: set to true if this application has code
     * associated with it.  Comes
     * from {@link android.R.styleable#AndroidManifestApplication_hasCode
     * android:hasCode} of the &lt;application&gt; tag.
     */
    public static final int FLAG_HAS_CODE = 1<<2;
    
    /**
     * Value for {@link #flags}: set to true if this application is persistent.
     * Comes from {@link android.R.styleable#AndroidManifestApplication_persistent
     * android:persistent} of the &lt;application&gt; tag.
     */
    public static final int FLAG_PERSISTENT = 1<<3;

    /**
     * Value for {@link #flags}: set to true if this application holds the
     * {@link android.Manifest.permission#FACTORY_TEST} permission and the
     * device is running in factory test mode.
     */
    public static final int FLAG_FACTORY_TEST = 1<<4;

    /**
     * Value for {@link #flags}: default value for the corresponding ActivityInfo flag.
     * Comes from {@link android.R.styleable#AndroidManifestApplication_allowTaskReparenting
     * android:allowTaskReparenting} of the &lt;application&gt; tag.
     */
    public static final int FLAG_ALLOW_TASK_REPARENTING = 1<<5;
    
    /**
     * Value for {@link #flags}: default value for the corresponding ActivityInfo flag.
     * Comes from {@link android.R.styleable#AndroidManifestApplication_allowClearUserData
     * android:allowClearUserData} of the &lt;application&gt; tag.
     */
    public static final int FLAG_ALLOW_CLEAR_USER_DATA = 1<<6;
    
    /**
     * Value for {@link #flags}: this is set if this application has been
     * install as an update to a built-in system application.
     */
    public static final int FLAG_UPDATED_SYSTEM_APP = 1<<7;
    
    /**
     * Value for {@link #flags}: this is set of the application has specified
     * {@link android.R.styleable#AndroidManifestApplication_testOnly
     * android:testOnly} to be true.
     */
    public static final int FLAG_TEST_ONLY = 1<<8;

    /**
     * Value for {@link #flags}: true when the application's window can be
     * reduced in size for smaller screens.  Corresponds to
     * {@link android.R.styleable#AndroidManifestSupportsScreens_smallScreens
     * android:smallScreens}.
     */
    public static final int FLAG_SUPPORTS_SMALL_SCREENS = 1<<9;
    
    /**
     * Value for {@link #flags}: true when the application's window can be
     * displayed on normal screens.  Corresponds to
     * {@link android.R.styleable#AndroidManifestSupportsScreens_normalScreens
     * android:normalScreens}.
     */
    public static final int FLAG_SUPPORTS_NORMAL_SCREENS = 1<<10; 
    
    /**
     * Value for {@link #flags}: true when the application's window can be
     * increased in size for larger screens.  Corresponds to
     * {@link android.R.styleable#AndroidManifestSupportsScreens_largeScreens
     * android:largeScreens}.
     */
    public static final int FLAG_SUPPORTS_LARGE_SCREENS = 1<<11;
    
    /**
     * Value for {@link #flags}: true when the application knows how to adjust
     * its UI for different screen sizes.  Corresponds to
     * {@link android.R.styleable#AndroidManifestSupportsScreens_resizeable
     * android:resizeable}.
     */
    public static final int FLAG_RESIZEABLE_FOR_SCREENS = 1<<12;
    
    /**
     * Value for {@link #flags}: true when the application knows how to
     * accomodate different screen densities.  Corresponds to
     * {@link android.R.styleable#AndroidManifestSupportsScreens_anyDensity
     * android:anyDensity}.
     */
    public static final int FLAG_SUPPORTS_SCREEN_DENSITIES = 1<<13;
    
    /**
     * Value for {@link #flags}: set to true if this application would like to
     * request the VM to operate under the safe mode. Comes from
     * {@link android.R.styleable#AndroidManifestApplication_vmSafeMode
     * android:vmSafeMode} of the &lt;application&gt; tag.
     */
    public static final int FLAG_VM_SAFE_MODE = 1<<14;

    /**
     * Value for {@link #flags}: set to <code>false</code> if the application does not wish
     * to permit any OS-driven backups of its data; <code>true</code> otherwise.
     * 
     * <p>Comes from the
     * {@link android.R.styleable#AndroidManifestApplication_allowBackup android:allowBackup}
     * attribute of the &lt;application&gt; tag.
     */
    public static final int FLAG_ALLOW_BACKUP = 1<<15;

    /**
     * Value for {@link #flags}: set to <code>false</code> if the application must be kept
     * in memory following a full-system restore operation; <code>true</code> otherwise.
     * Ordinarily, during a full system restore operation each application is shut down
     * following execution of its agent's onRestore() method.  Setting this attribute to
     * <code>false</code> prevents this.  Most applications will not need to set this attribute.
     *
     * <p>If
     * {@link android.R.styleable#AndroidManifestApplication_allowBackup android:allowBackup}
     * is set to <code>false</code> or no
     * {@link android.R.styleable#AndroidManifestApplication_backupAgent android:backupAgent}
     * is specified, this flag will be ignored.
     *
     * <p>Comes from the
     * {@link android.R.styleable#AndroidManifestApplication_killAfterRestore android:killAfterRestore}
     * attribute of the &lt;application&gt; tag.
     */
    public static final int FLAG_KILL_AFTER_RESTORE = 1<<16;

    /**
     * Value for {@link #flags}: Set to <code>true</code> if the application's backup
     * agent claims to be able to handle restore data even "from the future,"
     * i.e. from versions of the application with a versionCode greater than
     * the one currently installed on the device.  <i>Use with caution!</i>  By default
     * this attribute is <code>false</code> and the Backup Manager will ensure that data
     * from "future" versions of the application are never supplied during a restore operation.
     *
     * <p>If
     * {@link android.R.styleable#AndroidManifestApplication_allowBackup android:allowBackup}
     * is set to <code>false</code> or no
     * {@link android.R.styleable#AndroidManifestApplication_backupAgent android:backupAgent}
     * is specified, this flag will be ignored.
     *
     * <p>Comes from the
     * {@link android.R.styleable#AndroidManifestApplication_restoreAnyVersion android:restoreAnyVersion}
     * attribute of the &lt;application&gt; tag.
     */
    public static final int FLAG_RESTORE_ANY_VERSION = 1<<17;

    /**
     * Value for {@link #flags}: Set to true if the application is
     * currently installed on external/removable/unprotected storage.  Such
     * applications may not be available if their storage is not currently
     * mounted.  When the storage it is on is not available, it will look like
     * the application has been uninstalled (its .apk is no longer available)
     * but its persistent data is not removed.
     */
    public static final int FLAG_EXTERNAL_STORAGE = 1<<18;

    /**
     * Value for {@link #flags}: true when the application's window can be
     * increased in size for extra large screens.  Corresponds to
     * {@link android.R.styleable#AndroidManifestSupportsScreens_xlargeScreens
     * android:xlargeScreens}.
     * @hide
     */
    public static final int FLAG_SUPPORTS_XLARGE_SCREENS = 1<<19;
    
    /**
     * Value for {@link #flags}: this is true if the application has set
     * its android:neverEncrypt to true, false otherwise. It is used to specify
     * that this package specifically "opts-out" of a secured file system solution,
     * and will always store its data in-the-clear.
     *
     * {@hide}
     */
    public static final int FLAG_NEVER_ENCRYPT = 1<<30;

    /**
     * Value for {@link #flags}: Set to true if the application has been
     * installed using the forward lock option.
     *
     * {@hide}
     */
    public static final int FLAG_FORWARD_LOCK = 1<<29;

    /**
     * Value for {@link #flags}: set to <code>true</code> if the application
     * has reported that it is heavy-weight, and thus can not participate in
     * the normal application lifecycle.
     *
     * <p>Comes from the
     * {@link android.R.styleable#AndroidManifestApplication_cantSaveState android:cantSaveState}
     * attribute of the &lt;application&gt; tag.
     *
     * {@hide}
     */
    public static final int FLAG_CANT_SAVE_STATE = 1<<27;

    /**
     * Flags associated with the application.  Any combination of
     * {@link #FLAG_SYSTEM}, {@link #FLAG_DEBUGGABLE}, {@link #FLAG_HAS_CODE},
     * {@link #FLAG_PERSISTENT}, {@link #FLAG_FACTORY_TEST}, and
     * {@link #FLAG_ALLOW_TASK_REPARENTING}
     * {@link #FLAG_ALLOW_CLEAR_USER_DATA}, {@link #FLAG_UPDATED_SYSTEM_APP},
     * {@link #FLAG_TEST_ONLY}, {@link #FLAG_SUPPORTS_SMALL_SCREENS},
     * {@link #FLAG_SUPPORTS_NORMAL_SCREENS},
     * {@link #FLAG_SUPPORTS_LARGE_SCREENS},
     * {@link #FLAG_RESIZEABLE_FOR_SCREENS},
     * {@link #FLAG_SUPPORTS_SCREEN_DENSITIES}, {@link #FLAG_VM_SAFE_MODE}
     */
    public int flags = 0;
    
    /**
     * Full path to the location of this package.
     */
    public String sourceDir;

    /**
     * Full path to the location of the publicly available parts of this
     * package (i.e. the primary resource package and manifest).  For
     * non-forward-locked apps this will be the same as {@link #sourceDir).
     */
    public String publicSourceDir;
    
    /**
     * Full paths to the locations of extra resource packages this application
     * uses. This field is only used if there are extra resource packages,
     * otherwise it is null.
     * 
     * {@hide}
     */
    public String[] resourceDirs;

    /**
     * Paths to all shared libraries this application is linked against.  This
     * field is only set if the {@link PackageManager#GET_SHARED_LIBRARY_FILES
     * PackageManager.GET_SHARED_LIBRARY_FILES} flag was used when retrieving
     * the structure.
     */
    public String[] sharedLibraryFiles;
    
    /**
     * Full path to a directory assigned to the package for its persistent
     * data.
     */
    public String dataDir;

    /**
     * Full path to the directory where native JNI libraries are stored.
     */
    public String nativeLibraryDir;

    /**
     * The kernel user-ID that has been assigned to this application;
     * currently this is not a unique ID (multiple applications can have
     * the same uid).
     */
    public int uid;
    
    /**
     * The minimum SDK version this application targets.  It may run on earlier
     * versions, but it knows how to work with any new behavior added at this
     * version.  Will be {@link android.os.Build.VERSION_CODES#CUR_DEVELOPMENT}
     * if this is a development build and the app is targeting that.  You should
     * compare that this number is >= the SDK version number at which your
     * behavior was introduced.
     */
    public int targetSdkVersion;
    
    /**
     * When false, indicates that all components within this application are
     * considered disabled, regardless of their individually set enabled status.
     */
    public boolean enabled = true;

    /**
     * For convenient access to package's install location.
     * @hide
     */
    public int installLocation = PackageInfo.INSTALL_LOCATION_UNSPECIFIED;
    
    public void dump(Printer pw, String prefix) {
        super.dumpFront(pw, prefix);
        if (className != null) {
            pw.println(prefix + "className=" + className);
        }
        if (permission != null) {
            pw.println(prefix + "permission=" + permission);
        }
        pw.println(prefix + "processName=" + processName);
        pw.println(prefix + "taskAffinity=" + taskAffinity);
        pw.println(prefix + "uid=" + uid + " flags=0x" + Integer.toHexString(flags)
                + " theme=0x" + Integer.toHexString(theme));
        pw.println(prefix + "sourceDir=" + sourceDir);
        if (sourceDir == null) {
            if (publicSourceDir != null) {
                pw.println(prefix + "publicSourceDir=" + publicSourceDir);
            }
        } else if (!sourceDir.equals(publicSourceDir)) {
            pw.println(prefix + "publicSourceDir=" + publicSourceDir);
        }
        if (resourceDirs != null) {
            pw.println(prefix + "resourceDirs=" + resourceDirs);
        }
        pw.println(prefix + "dataDir=" + dataDir);
        if (sharedLibraryFiles != null) {
            pw.println(prefix + "sharedLibraryFiles=" + sharedLibraryFiles);
        }
        pw.println(prefix + "enabled=" + enabled + " targetSdkVersion=" + targetSdkVersion);
        if (manageSpaceActivityName != null) {
            pw.println(prefix + "manageSpaceActivityName="+manageSpaceActivityName);
        }
        if (descriptionRes != 0) {
            pw.println(prefix + "description=0x"+Integer.toHexString(descriptionRes));
        }
        super.dumpBack(pw, prefix);
    }
    
    public static class DisplayNameComparator
            implements Comparator<ApplicationInfo> {
        public DisplayNameComparator(PackageManager pm) {
            mPM = pm;
        }

        public final int compare(ApplicationInfo aa, ApplicationInfo ab) {
            CharSequence  sa = mPM.getApplicationLabel(aa);
            if (sa == null) {
                sa = aa.packageName;
            }
            CharSequence  sb = mPM.getApplicationLabel(ab);
            if (sb == null) {
                sb = ab.packageName;
            }
            
            return sCollator.compare(sa.toString(), sb.toString());
        }

        private final Collator   sCollator = Collator.getInstance();
        private PackageManager   mPM;
    }

    public ApplicationInfo() {
    }
    
    public ApplicationInfo(ApplicationInfo orig) {
        super(orig);
        taskAffinity = orig.taskAffinity;
        permission = orig.permission;
        processName = orig.processName;
        className = orig.className;
        theme = orig.theme;
        flags = orig.flags;
        sourceDir = orig.sourceDir;
        publicSourceDir = orig.publicSourceDir;
        nativeLibraryDir = orig.nativeLibraryDir;
        resourceDirs = orig.resourceDirs;
        sharedLibraryFiles = orig.sharedLibraryFiles;
        dataDir = orig.dataDir;
        uid = orig.uid;
        targetSdkVersion = orig.targetSdkVersion;
        enabled = orig.enabled;
        installLocation = orig.installLocation;
        manageSpaceActivityName = orig.manageSpaceActivityName;
        descriptionRes = orig.descriptionRes;
    }


    public String toString() {
        return "ApplicationInfo{"
            + Integer.toHexString(System.identityHashCode(this))
            + " " + packageName + "}";
    }

    public int describeContents() {
        return 0;
    }

    public void writeToParcel(Parcel dest, int parcelableFlags) {
        super.writeToParcel(dest, parcelableFlags);
        dest.writeString(taskAffinity);
        dest.writeString(permission);
        dest.writeString(processName);
        dest.writeString(className);
        dest.writeInt(theme);
        dest.writeInt(flags);
        dest.writeString(sourceDir);
        dest.writeString(publicSourceDir);
        dest.writeString(nativeLibraryDir);
        dest.writeStringArray(resourceDirs);
        dest.writeStringArray(sharedLibraryFiles);
        dest.writeString(dataDir);
        dest.writeInt(uid);
        dest.writeInt(targetSdkVersion);
        dest.writeInt(enabled ? 1 : 0);
        dest.writeInt(installLocation);
        dest.writeString(manageSpaceActivityName);
        dest.writeString(backupAgentName);
        dest.writeInt(descriptionRes);
    }

    public static final Parcelable.Creator<ApplicationInfo> CREATOR
            = new Parcelable.Creator<ApplicationInfo>() {
        public ApplicationInfo createFromParcel(Parcel source) {
            return new ApplicationInfo(source);
        }
        public ApplicationInfo[] newArray(int size) {
            return new ApplicationInfo[size];
        }
    };

    private ApplicationInfo(Parcel source) {
        super(source);
        taskAffinity = source.readString();
        permission = source.readString();
        processName = source.readString();
        className = source.readString();
        theme = source.readInt();
        flags = source.readInt();
        sourceDir = source.readString();
        publicSourceDir = source.readString();
        nativeLibraryDir = source.readString();
        resourceDirs = source.readStringArray();
        sharedLibraryFiles = source.readStringArray();
        dataDir = source.readString();
        uid = source.readInt();
        targetSdkVersion = source.readInt();
        enabled = source.readInt() != 0;
        installLocation = source.readInt();
        manageSpaceActivityName = source.readString();
        backupAgentName = source.readString();
        descriptionRes = source.readInt();
    }

    /**
     * Retrieve the textual description of the application.  This
     * will call back on the given PackageManager to load the description from
     * the application.
     *
     * @param pm A PackageManager from which the label can be loaded; usually
     * the PackageManager from which you originally retrieved this item.
     *
     * @return Returns a CharSequence containing the application's description.
     * If there is no description, null is returned.
     */
    public CharSequence loadDescription(PackageManager pm) {
        if (descriptionRes != 0) {
            CharSequence label = pm.getText(packageName, descriptionRes, this);
            if (label != null) {
                return label;
            }
        }
        return null;
    }

    /**
     * Disable compatibility mode
     * 
     * @hide
     */
    public void disableCompatibilityMode() {
        flags |= (FLAG_SUPPORTS_LARGE_SCREENS | FLAG_SUPPORTS_NORMAL_SCREENS |
                FLAG_SUPPORTS_SMALL_SCREENS | FLAG_RESIZEABLE_FOR_SCREENS |
                FLAG_SUPPORTS_SCREEN_DENSITIES | FLAG_SUPPORTS_XLARGE_SCREENS);
    }
    
    /**
     * @hide
     */
    @Override protected Drawable loadDefaultIcon(PackageManager pm) {
        if ((flags & FLAG_EXTERNAL_STORAGE) != 0
                && isPackageUnavailable(pm)) {
            return Resources.getSystem().getDrawable(
                    com.android.internal.R.drawable.sym_app_on_sd_unavailable_icon);
        }
        return pm.getDefaultActivityIcon();
    }
    
    private boolean isPackageUnavailable(PackageManager pm) {
        try {
            return pm.getPackageInfo(packageName, 0) == null;
        } catch (NameNotFoundException ex) {
            return true;
        }
    }
    
    /**
     * @hide
     */
    @Override protected ApplicationInfo getApplicationInfo() {
        return this;
    }
}