/*
 * This is the source code of Telegram for Android v. 5.x.x.
 * It is licensed under GNU GPL v. 2 or later.
 * You should have received a copy of the license in this archive (see LICENSE).
 *
 * Copyright Nikolai Kudashov, 2013-2018.
 */

package org.telegram.messenger;

import android.util.Log;

import org.telegram.messenger.time.FastDateFormat;

import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStreamWriter;
import java.util.Locale;

public class FileLog {
    private OutputStreamWriter streamWriter = null;
    private FastDateFormat dateFormat = null;
    private DispatchQueue logQueue = null;
    private File currentFile = null;
    private File networkFile = null;
    private boolean initied;

    private final static String tag = "tmessages";

    private static volatile FileLog Instance = null;
    public static FileLog getInstance() {
        FileLog localInstance = Instance;
        if (localInstance == null) {
            synchronized (FileLog.class) {
                localInstance = Instance;
                if (localInstance == null) {
                    Instance = localInstance = new FileLog();
                }
            }
        }
        return localInstance;
    }

    public FileLog() {
        if (!BuildVars.LOGS_ENABLED) {
            return;
        }
        init();
    }

    public void init() {
        if (initied) {
            return;
        }
        dateFormat = FastDateFormat.getInstance("dd_MM_yyyy_HH_mm_ss", Locale.US);
        try {
            File sdCard = ApplicationLoader.applicationContext.getExternalFilesDir(null);
            if (sdCard == null) {
                return;
            }
            File dir = new File(sdCard.getAbsolutePath() + "/logs");
            dir.mkdirs();
            currentFile = new File(dir, dateFormat.format(System.currentTimeMillis()) + ".txt");
        } catch (Exception e) {
            e.printStackTrace();
        }
        try {
            logQueue = new DispatchQueue("logQueue");
            currentFile.createNewFile();
            FileOutputStream stream = new FileOutputStream(currentFile);
            streamWriter = new OutputStreamWriter(stream);
            streamWriter.write("-----start log " + dateFormat.format(System.currentTimeMillis()) + "-----\n");
            streamWriter.flush();
        } catch (Exception e) {
            e.printStackTrace();
        }
        initied = true;
    }

    public static void ensureInitied() {
        getInstance().init();
    }

    public static String getNetworkLogPath() {
        if (!BuildVars.LOGS_ENABLED) {
            return "";
        }
        try {
            File sdCard = ApplicationLoader.applicationContext.getExternalFilesDir(null);
            if (sdCard == null) {
                return "";
            }
            File dir = new File(sdCard.getAbsolutePath() + "/logs");
            dir.mkdirs();
            getInstance().networkFile = new File(dir, getInstance().dateFormat.format(System.currentTimeMillis()) + "_net.txt");
            return getInstance().networkFile.getAbsolutePath();
        } catch (Throwable e) {
            e.printStackTrace();
        }
        return "";
    }

    public static void e(final String message, final Throwable exception) {
        if (!BuildVars.LOGS_ENABLED) {
            return;
        }
        ensureInitied();
        Log.e(tag, message, exception);
        if (getInstance().streamWriter != null) {
            getInstance().logQueue.postRunnable(() -> {
                try {
                    getInstance().streamWriter.write(getInstance().dateFormat.format(System.currentTimeMillis()) + " E/tmessages: " + message + "\n");
                    getInstance().streamWriter.write(exception.toString());
                    getInstance().streamWriter.flush();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            });
        }
    }

    public static void e(final String message) {
        if (!BuildVars.LOGS_ENABLED) {
            return;
        }
        ensureInitied();
        Log.e(tag, message);
        if (getInstance().streamWriter != null) {
            getInstance().logQueue.postRunnable(() -> {
                try {
                    getInstance().streamWriter.write(getInstance().dateFormat.format(System.currentTimeMillis()) + " E/tmessages: " + message + "\n");
                    getInstance().streamWriter.flush();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            });
        }
    }

    public static void e(final Throwable e) {
        if (!BuildVars.LOGS_ENABLED) {
            return;
        }
        ensureInitied();
        e.printStackTrace();
        if (getInstance().streamWriter != null) {
            getInstance().logQueue.postRunnable(() -> {
                try {
                    getInstance().streamWriter.write(getInstance().dateFormat.format(System.currentTimeMillis()) + " E/tmessages: " + e + "\n");
                    StackTraceElement[] stack = e.getStackTrace();
                    for (int a = 0; a < stack.length; a++) {
                        getInstance().streamWriter.write(getInstance().dateFormat.format(System.currentTimeMillis()) + " E/tmessages: " + stack[a] + "\n");
                    }
                    getInstance().streamWriter.flush();
                } catch (Exception e1) {
                    e1.printStackTrace();
                }
            });
        } else {
            e.printStackTrace();
        }
    }

    public static void d(final String message) {
        if (!BuildVars.LOGS_ENABLED) {
            return;
        }
        ensureInitied();
        Log.d(tag, message);
        if (getInstance().streamWriter != null) {
            getInstance().logQueue.postRunnable(() -> {
                try {
                    getInstance().streamWriter.write(getInstance().dateFormat.format(System.currentTimeMillis()) + " D/tmessages: " + message + "\n");
                    getInstance().streamWriter.flush();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            });
        }
    }

    public static void w(final String message) {
        if (!BuildVars.LOGS_ENABLED) {
            return;
        }
        ensureInitied();
        Log.w(tag, message);
        if (getInstance().streamWriter != null) {
            getInstance().logQueue.postRunnable(() -> {
                try {
                    getInstance().streamWriter.write(getInstance().dateFormat.format(System.currentTimeMillis()) + " W/tmessages: " + message + "\n");
                    getInstance().streamWriter.flush();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            });
        }
    }

    public static void cleanupLogs() {
        ensureInitied();
        File sdCard = ApplicationLoader.applicationContext.getExternalFilesDir(null);
        if (sdCard == null) {
            return;
        }
        File dir = new File (sdCard.getAbsolutePath() + "/logs");
        File[] files = dir.listFiles();
        if (files != null) {
            for (int a = 0; a < files.length; a++) {
                File file = files[a];
                if (getInstance().currentFile != null && file.getAbsolutePath().equals(getInstance().currentFile.getAbsolutePath())) {
                    continue;
                }
                if (getInstance().networkFile != null && file.getAbsolutePath().equals(getInstance().networkFile.getAbsolutePath())) {
                    continue;
                }
                file.delete();
            }
        }
    }
}
