package com.android.settingslib;

import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.pm.UserInfo;
import android.content.pm.Signature;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.Drawable;
import android.net.ConnectivityManager;
import android.os.BatteryManager;
import android.os.UserManager;
import com.android.internal.util.UserIcons;
import com.android.settingslib.drawable.UserIconDrawable;

import java.text.NumberFormat;

public class Utils {
    private static Signature[] sSystemSignature;
    private static String sPermissionControllerPackageName;
    private static String sServicesSystemSharedLibPackageName;
    private static String sSharedSystemSharedLibPackageName;

    /**
     * Return string resource that best describes combination of tethering
     * options available on this device.
     */
    public static int getTetheringLabel(ConnectivityManager cm) {
        String[] usbRegexs = cm.getTetherableUsbRegexs();
        String[] wifiRegexs = cm.getTetherableWifiRegexs();
        String[] bluetoothRegexs = cm.getTetherableBluetoothRegexs();

        boolean usbAvailable = usbRegexs.length != 0;
        boolean wifiAvailable = wifiRegexs.length != 0;
        boolean bluetoothAvailable = bluetoothRegexs.length != 0;

        if (wifiAvailable && usbAvailable && bluetoothAvailable) {
            return R.string.tether_settings_title_all;
        } else if (wifiAvailable && usbAvailable) {
            return R.string.tether_settings_title_all;
        } else if (wifiAvailable && bluetoothAvailable) {
            return R.string.tether_settings_title_all;
        } else if (wifiAvailable) {
            return R.string.tether_settings_title_wifi;
        } else if (usbAvailable && bluetoothAvailable) {
            return R.string.tether_settings_title_usb_bluetooth;
        } else if (usbAvailable) {
            return R.string.tether_settings_title_usb;
        } else {
            return R.string.tether_settings_title_bluetooth;
        }
    }

    /**
     * Returns a label for the user, in the form of "User: user name" or "Work profile".
     */
    public static String getUserLabel(Context context, UserInfo info) {
        String name = info != null ? info.name : null;
        if (info.isManagedProfile()) {
            // We use predefined values for managed profiles
            return context.getString(R.string.managed_user_title);
        } else if (info.isGuest()) {
            name = context.getString(R.string.user_guest);
        }
        if (name == null && info != null) {
            name = Integer.toString(info.id);
        } else if (info == null) {
            name = context.getString(R.string.unknown);
        }
        return context.getResources().getString(R.string.running_process_item_user_label, name);
    }

    /**
     * Returns a circular icon for a user.
     */
    public static UserIconDrawable getUserIcon(Context context, UserManager um, UserInfo user) {
        final int iconSize = UserIconDrawable.getSizeForList(context);
        if (user.isManagedProfile()) {
            // We use predefined values for managed profiles
            Bitmap b = BitmapFactory.decodeResource(context.getResources(),
                    com.android.internal.R.drawable.ic_corp_icon);
            return new UserIconDrawable(iconSize).setIcon(b).bake();
        }
        if (user.iconPath != null) {
            Bitmap icon = um.getUserIcon(user.id);
            if (icon != null) {
                return new UserIconDrawable(iconSize).setIcon(icon).bake();
            }
        }
        return new UserIconDrawable(iconSize).setIconDrawable(
                UserIcons.getDefaultUserIcon(user.id, /* light= */ false)).bake();
    }

    /** Formats the ratio of amount/total as a percentage. */
    public static String formatPercentage(long amount, long total) {
        return formatPercentage(((double) amount) / total);
    }

    /** Formats an integer from 0..100 as a percentage. */
    public static String formatPercentage(int percentage) {
        return formatPercentage(((double) percentage) / 100.0);
    }

    /** Formats a double from 0.0..1.0 as a percentage. */
    private static String formatPercentage(double percentage) {
      return NumberFormat.getPercentInstance().format(percentage);
    }

    public static int getBatteryLevel(Intent batteryChangedIntent) {
        int level = batteryChangedIntent.getIntExtra(BatteryManager.EXTRA_LEVEL, 0);
        int scale = batteryChangedIntent.getIntExtra(BatteryManager.EXTRA_SCALE, 100);
        return (level * 100) / scale;
    }

    public static String getBatteryStatus(Resources res, Intent batteryChangedIntent) {
        return Utils.getBatteryStatus(res, batteryChangedIntent, false);
    }

    public static String getBatteryStatus(Resources res, Intent batteryChangedIntent,
            boolean shortString) {
        int plugType = batteryChangedIntent.getIntExtra(BatteryManager.EXTRA_PLUGGED, 0);
        int status = batteryChangedIntent.getIntExtra(BatteryManager.EXTRA_STATUS,
                BatteryManager.BATTERY_STATUS_UNKNOWN);
        String statusString;
        if (status == BatteryManager.BATTERY_STATUS_CHARGING) {
            int resId;
            if (plugType == BatteryManager.BATTERY_PLUGGED_AC) {
                resId = shortString ? R.string.battery_info_status_charging_ac_short
                        : R.string.battery_info_status_charging_ac;
            } else if (plugType == BatteryManager.BATTERY_PLUGGED_USB) {
                resId = shortString ? R.string.battery_info_status_charging_usb_short
                        : R.string.battery_info_status_charging_usb;
            } else if (plugType == BatteryManager.BATTERY_PLUGGED_WIRELESS) {
                resId = shortString ? R.string.battery_info_status_charging_wireless_short
                        : R.string.battery_info_status_charging_wireless;
            } else {
                resId = R.string.battery_info_status_charging;
            }
            statusString = res.getString(resId);
        } else if (status == BatteryManager.BATTERY_STATUS_DISCHARGING) {
            statusString = res.getString(R.string.battery_info_status_discharging);
        } else if (status == BatteryManager.BATTERY_STATUS_NOT_CHARGING) {
            statusString = res.getString(R.string.battery_info_status_not_charging);
        } else if (status == BatteryManager.BATTERY_STATUS_FULL) {
            statusString = res.getString(R.string.battery_info_status_full);
        } else {
            statusString = res.getString(R.string.battery_info_status_unknown);
        }

        return statusString;
    }

    /**
     * Determine whether a package is a "system package", in which case certain things (like
     * disabling notifications or disabling the package altogether) should be disallowed.
     */
    public static boolean isSystemPackage(PackageManager pm, PackageInfo pkg) {
        if (sSystemSignature == null) {
            sSystemSignature = new Signature[]{ getSystemSignature(pm) };
        }
        if (sPermissionControllerPackageName == null) {
            sPermissionControllerPackageName = pm.getPermissionControllerPackageName();
        }
        if (sServicesSystemSharedLibPackageName == null) {
            sServicesSystemSharedLibPackageName = pm.getServicesSystemSharedLibraryPackageName();
        }
        if (sSharedSystemSharedLibPackageName == null) {
            sSharedSystemSharedLibPackageName = pm.getSharedSystemSharedLibraryPackageName();
        }
        return (sSystemSignature[0] != null
                        && sSystemSignature[0].equals(getFirstSignature(pkg)))
                || pkg.packageName.equals(sPermissionControllerPackageName)
                || pkg.packageName.equals(sServicesSystemSharedLibPackageName)
                || pkg.packageName.equals(sSharedSystemSharedLibPackageName);
    }

    private static Signature getFirstSignature(PackageInfo pkg) {
        if (pkg != null && pkg.signatures != null && pkg.signatures.length > 0) {
            return pkg.signatures[0];
        }
        return null;
    }

    private static Signature getSystemSignature(PackageManager pm) {
        try {
            final PackageInfo sys = pm.getPackageInfo("android", PackageManager.GET_SIGNATURES);
            return getFirstSignature(sys);
        } catch (NameNotFoundException e) {
        }
        return null;
    }
}