/**
 *   ownCloud Android client application
 *
 *   @author Bartek Przybylski
 *   @author David A. Velasco
 *   Copyright (C) 2011  Bartek Przybylski
 *   Copyright (C) 2015 ownCloud Inc.
 *
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License version 2,
 *   as published by the Free Software Foundation.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

package com.owncloud.android.utils;

import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Context;
import android.graphics.Point;
import android.graphics.PorterDuff;
import android.os.Build;
import android.text.format.DateUtils;
import android.view.Display;
import android.widget.ProgressBar;
import android.widget.SeekBar;

import com.owncloud.android.MainApp;
import com.owncloud.android.R;
import com.owncloud.android.datamodel.OCFile;

import java.math.BigDecimal;
import java.net.IDN;
import java.text.DateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

/**
 * A helper class for some string operations.
 */
public class DisplayUtils {
    
    private static final String OWNCLOUD_APP_NAME = "ownCloud";
    
    private static final String[] sizeSuffixes = { "B", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB" };
    private static final int[] sizeScales = { 0, 0, 1, 1, 1, 2, 2, 2, 2 };

    private static Map<String, String> mimeType2HumanReadable;

    static {
        mimeType2HumanReadable = new HashMap<String, String>();
        // images
        mimeType2HumanReadable.put("image/jpeg", "JPEG image");
        mimeType2HumanReadable.put("image/jpg", "JPEG image");
        mimeType2HumanReadable.put("image/png", "PNG image");
        mimeType2HumanReadable.put("image/bmp", "Bitmap image");
        mimeType2HumanReadable.put("image/gif", "GIF image");
        mimeType2HumanReadable.put("image/svg+xml", "JPEG image");
        mimeType2HumanReadable.put("image/tiff", "TIFF image");
        // music
        mimeType2HumanReadable.put("audio/mpeg", "MP3 music file");
        mimeType2HumanReadable.put("application/ogg", "OGG music file");
    }

    /**
     * Converts the file size in bytes to human readable output.
     * <ul>
     *     <li>appends a size suffix, e.g. B, KB, MB etc.</li>
     *     <li>rounds the size based on the suffix to 0,1 or 2 decimals</li>
     * </ul>
     *
     * @param bytes Input file size
     * @return Like something readable like "12 MB"
     */
    public static String bytesToHumanReadable(long bytes) {
        double result = bytes;
        int attachedSuff = 0;
        while (result > 1024 && attachedSuff < sizeSuffixes.length) {
            result /= 1024.;
            attachedSuff++;
        }

        return new BigDecimal(result).setScale(
                sizeScales[attachedSuff], BigDecimal.ROUND_HALF_UP) + " " + sizeSuffixes[attachedSuff];
    }

    /**
     * Converts MIME types like "image/jpg" to more end user friendly output
     * like "JPG image".
     * 
     * @param mimetype MIME type to convert
     * @return A human friendly version of the MIME type
     */
    public static String convertMIMEtoPrettyPrint(String mimetype) {
        if (mimeType2HumanReadable.containsKey(mimetype)) {
            return mimeType2HumanReadable.get(mimetype);
        }
        if (mimetype.split("/").length >= 2)
            return mimetype.split("/")[1].toUpperCase() + " file";
        return "Unknown type";
    }

    /**
     * Converts Unix time to human readable format
     * @param milliseconds that have passed since 01/01/1970
     * @return The human readable time for the users locale
     */
    public static String unixTimeToHumanReadable(long milliseconds) {
        Date date = new Date(milliseconds);
        DateFormat df = DateFormat.getDateTimeInstance();
        return df.format(date);
    }
    
    public static int getSeasonalIconId() {
        if (Calendar.getInstance().get(Calendar.DAY_OF_YEAR) >= 354 &&
                MainApp.getAppContext().getString(R.string.app_name).equals(OWNCLOUD_APP_NAME)) {
            return R.drawable.winter_holidays_icon;
        } else {
            return R.drawable.icon;
        }
    }
    
    /**
     * Converts an internationalized domain name (IDN) in an URL to and from ASCII/Unicode.
     * @param url the URL where the domain name should be converted
     * @param toASCII if true converts from Unicode to ASCII, if false converts from ASCII to Unicode
     * @return the URL containing the converted domain name
     */
    @TargetApi(Build.VERSION_CODES.GINGERBREAD)
    public static String convertIdn(String url, boolean toASCII) {

        String urlNoDots = url;
        String dots="";
        while (urlNoDots.startsWith(".")) {
            urlNoDots = url.substring(1);
            dots = dots + ".";
        }

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD) {
            // Find host name after '//' or '@'
            int hostStart = 0;
            if  (urlNoDots.indexOf("//") != -1) {
                hostStart = url.indexOf("//") + "//".length();
            } else if (url.indexOf("@") != -1) {
                hostStart = url.indexOf("@") + "@".length();
            }

            int hostEnd = url.substring(hostStart).indexOf("/");
            // Handle URL which doesn't have a path (path is implicitly '/')
            hostEnd = (hostEnd == -1 ? urlNoDots.length() : hostStart + hostEnd);

            String host = urlNoDots.substring(hostStart, hostEnd);
            host = (toASCII ? IDN.toASCII(host) : IDN.toUnicode(host));

            return dots + urlNoDots.substring(0, hostStart) + host + urlNoDots.substring(hostEnd);
        } else {
            return dots + url;
        }
    }

    /**
     * Get the file extension if it is on path as type "content://.../DocInfo.doc"
     * @param filepath: Content Uri converted to string format
     * @return String: fileExtension (type '.pdf'). Empty if no extension
     */
    public static String getComposedFileExtension(String filepath) {
        String fileExtension = "";
        String fileNameInContentUri = filepath.substring(filepath.lastIndexOf("/"));

        // Check if extension is included in uri
        int pos = fileNameInContentUri.lastIndexOf('.');
        if (pos >= 0) {
            fileExtension = fileNameInContentUri.substring(pos);
        }
        return fileExtension;
    }

    @SuppressWarnings("deprecation")
    public static CharSequence getRelativeDateTimeString (
            Context c, long time, long minResolution, long transitionResolution, int flags
            ){
        
        CharSequence dateString = "";
        
        // in Future
        if (time > System.currentTimeMillis()){
            return DisplayUtils.unixTimeToHumanReadable(time);
        } 
        // < 60 seconds -> seconds ago
        else if ((System.currentTimeMillis() - time) < 60 * 1000) {
            return c.getString(R.string.file_list_seconds_ago);
        } else {
            dateString = DateUtils.getRelativeDateTimeString(c, time, minResolution, transitionResolution, flags);
        }

        String[] parts = dateString.toString().split(",");
        if (parts.length == 2) {
            if (parts[1].contains(":") && !parts[0].contains(":")) {
                return parts[0];
            } else if (parts[0].contains(":") && !parts[1].contains(":")) {
                return parts[1];
            }
        }
        //dateString contains unexpected format. fallback: use relative date time string from android api as is.
        return dateString.toString();
    }

    /**
     * Update the passed path removing the last "/" if it is not the root folder
     * @param path
     */
    public static String getPathWithoutLastSlash(String path) {

        // Remove last slash from path
        if (path.length() > 1 && path.charAt(path.length()-1) == OCFile.PATH_SEPARATOR.charAt(0)) {
            path = path.substring(0, path.length()-1);
        }
        return path;
    }


    /**
     * Gets the screen size in pixels in a backwards compatible way
     *
     * @param caller        Activity calling; needed to get access to the {@link android.view.WindowManager}
     * @return              Size in pixels of the screen, or default {@link Point} if caller is null
     */
    public static Point getScreenSize(Activity caller) {
        Point size = new Point();
        if (caller != null) {
            Display display = caller.getWindowManager().getDefaultDisplay();
            if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.HONEYCOMB_MR2) {
                display.getSize(size);
            } else {
                size.set(display.getWidth(), display.getHeight());
            }
        }
        return size;
    }

    /**
     * sets the coloring of the given progress bar to color_accent.
     *
     * @param progressBar the progress bar to be colored
     */
    public static void colorPreLollipopHorizontalProgressBar(ProgressBar progressBar) {
        if (progressBar != null && Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
            int color = progressBar.getResources().getColor(R.color.color_accent);
            progressBar.getIndeterminateDrawable().setColorFilter(color, PorterDuff.Mode.SRC_IN);
            progressBar.getProgressDrawable().setColorFilter(color, PorterDuff.Mode.SRC_IN);
        }
    }

    /**
     * sets the coloring of the given seek bar to color_accent.
     *
     * @param seekBar the seek bar to be colored
     */
    public static void colorPreLollipopHorizontalSeekBar(SeekBar seekBar) {
        if (seekBar != null && Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
            colorPreLollipopHorizontalProgressBar(seekBar);

            if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
                int color = seekBar.getResources().getColor(R.color.color_accent);
                seekBar.getThumb().setColorFilter(color, PorterDuff.Mode.SRC_IN);
                seekBar.getThumb().setColorFilter(color, PorterDuff.Mode.SRC_IN);
            }
        }
    }

}