package com.zlw.main.mp3playerlib.utils;

import android.annotation.TargetApi;
import android.content.Context;
import android.os.Build;
import android.os.Environment;
import android.os.SystemClock;
import android.util.Log;

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

public class Logger {
    private static final String PRE = "^_^";
    private static final String TAG = Logger.class.getSimpleName();
    private static final int LOG_LENGTH_LIMITATION = 4000;

    public static boolean IsDebug = true;

    private static final String space = "====================================================================================================";
    private static boolean LOGV = true;
    private static boolean LOGD = true;
    private static boolean LOGI = true;
    private static boolean LOGW = true;
    private static boolean LOGE = true;

    public enum LogLevel {
        V, D, I, W, E
    }

//    private static boolean LOGV = false;
//    private static boolean LOGD = false;
//    private static boolean LOGI = false;
//    private static boolean LOGW = false;
//    private static boolean LOGE = false;

    public static void v(String tag, String format, Object... args) {
        if (LOGV) {
            String message = buildMessage(format, args);
            tag = formatLength(PRE + tag, 28);

            Log.v(tag, message);
            cacheLongLog(tag, message);
        }
    }

    public static void v(Throwable throwable, String tag, String format, Object... args) {
        if (LOGV) {
            String message = buildMessage(format, args);
            tag = formatLength(PRE + tag, 28);

            Log.v(tag, message, throwable);
            cacheLongLog(tag, message, throwable);
        }
    }

    public static void d(String tag, String format, Object... args) {
        if (LOGD) {
            String message = buildMessage(format, args);
            tag = formatLength(PRE + tag, 28);

            Log.d(tag, message);
            cacheLongLog(tag, message);
        }
    }

    public static void d(Throwable throwable, String tag, String format, Object... args) {
        if (LOGD) {
            String message = buildMessage(format, args);
            tag = formatLength(PRE + tag, 28);

            Log.d(tag, message, throwable);
            cacheLongLog(tag, message, throwable);
        }
    }

    public static void i(String tag, String format, Object... args) {
        if (LOGI) {
            String message = buildMessage(format, args);
            tag = formatLength(PRE + tag, 28);

            Log.i(tag, message);
            cacheLongLog(tag, message);
        }
    }

    public static void i(Throwable throwable, String tag, String format, Object... args) {
        if (LOGI) {
            String message = buildMessage(format, args);
            tag = formatLength(PRE + tag, 28);

            Log.i(tag, message, throwable);
            cacheLongLog(tag, message, throwable);
        }
    }

    public static void w(String tag, String format, Object... args) {
        if (LOGW) {
            String message = buildMessage(format, args);
            tag = formatLength(PRE + tag, 28);

            Log.w(tag, message);
            cacheLongLog(tag, message);
        }
    }

    public static void w(Throwable throwable, String tag, String format, Object... args) {
        if (LOGW) {
            String message = buildMessage(format, args);
            tag = formatLength(PRE + tag, 28);

            Log.w(tag, message, throwable);
            cacheLongLog(tag, message, throwable);
        }
    }

    public static void e(String tag, String format, Object... args) {
        if (LOGE) {
            String message = buildMessage(format, args);
            tag = formatLength(PRE + tag, 28);

            Log.e(tag, message);
            cacheLongLog(tag, message);
        }
    }

    public static void e(Throwable throwable, String tag, String format, Object... args) {
        if (LOGE) {
            String message = buildMessage(format, args);
            tag = formatLength(PRE + tag, 28);

            Log.e(tag, message, throwable);
            cacheLongLog(tag, message, throwable);
        }
    }

    /**
     * Please refer to comment of {@link #cacheLongLog(String, String, Throwable)}
     *
     * @param tag        TAG name.
     * @param logContent Log content.
     */
    private static void cacheLongLog(String tag, String logContent) {
        cacheLongLog(tag, logContent, null);
    }

    /**
     * Due to length limitation of Logcat, over long log content won't be shown completely in log window,<br/>
     * so cache it to local file at particular path for convenient checking.
     *
     * @param tag        TAG name.
     * @param logContent Log content.
     * @param throwable  Throwable instance, for printing stack trace.
     */
    @TargetApi(Build.VERSION_CODES.KITKAT)
    private static void cacheLongLog(String tag, String logContent, Throwable throwable) {

    }

    /**
     * 打印调用者栈信息
     * 本方法使用System.out输出, 对log进行过滤时请注意
     */
    public static void printCaller() {
        if (!IsDebug) {
            return;
        }

        try {
            String caller, callingClass, callFile;
            int lineNumber;
            StackTraceElement[] trace = new Throwable().fillInStackTrace().getStackTrace();
            StringBuilder infoBuffer = new StringBuilder();
            infoBuffer.append("print caller info\n==========BEGIN OF CALLER INFO============\n");
            for (int i = 2; i < trace.length; i++) {
                callingClass = trace[i].getClassName();
                callingClass = callingClass.substring(callingClass.lastIndexOf('.') + 1);
                caller = trace[i].getMethodName();
                callFile = trace[i].getFileName();
                lineNumber = trace[i].getLineNumber();
                String method = String.format(Locale.US, "[%03d] %s.%s(%s:%d)"
                        , Thread.currentThread().getId(), callingClass, caller, callFile, lineNumber);
                infoBuffer.append(method);
                infoBuffer.append("\n");
            }
            infoBuffer.append("==========END OF CALLER INFO============");
            Logger.i(TAG, infoBuffer.toString());
        } catch (Exception e) {
            Logger.e(e, TAG, e.getMessage());
        }
    }

    private static String buildMessage(String format, Object[] args) {
        try {
            String msg = (args == null || args.length == 0) ? format : String.format(Locale.US, format, args);
            if (!IsDebug) {
                return msg;
            }
            StackTraceElement[] trace = new Throwable().fillInStackTrace().getStackTrace();
            String caller = "";
            String callingClass = "";
            String callFile = "";
            int lineNumber = 0;
            for (int i = 2; i < trace.length; i++) {
                Class<?> clazz = trace[i].getClass();
                if (!clazz.equals(Logger.class)) {
                    callingClass = trace[i].getClassName();
                    callingClass = callingClass.substring(callingClass
                            .lastIndexOf('.') + 1);
                    caller = trace[i].getMethodName();
                    callFile = trace[i].getFileName();
                    lineNumber = trace[i].getLineNumber();
                    break;
                }
            }

            String method = String.format(Locale.US, "[%03d] %s.%s(%s:%d)"
                    , Thread.currentThread().getId(), callingClass, caller, callFile, lineNumber);

            return String.format(Locale.US, "%s> %s", formatLength(method, 93), msg);
        } catch (Exception e) {
            Logger.e(e, TAG, e.getMessage());
        }
        return "----->ERROR LOG STRING<------";
    }

    private static String formatLength(String src, int len) {
        StringBuilder sb = new StringBuilder();
        if (src.length() >= len) {
            sb.append(src);
        } else {
            sb.append(src);
            sb.append(space.substring(0, len - src.length()));
        }
        return sb.toString();
    }

    @TargetApi(Build.VERSION_CODES.KITKAT)
    public static File getAvailableExternalCacheDir(Context ctx) {
        File[] cacheDirectories = ctx.getExternalCacheDirs();
        for (int index = cacheDirectories.length - 1; index >= 0; index--) {
            File file = cacheDirectories[index];
            if (null != file && Environment.MEDIA_MOUNTED.equals(Environment.getStorageState(file))) {
                return file;
            }
        }
        return null;
    }

    /**
     * 判断文件是否存在
     *
     * @param filePath 文件路径
     * @return {@code true}: 存在<br>{@code false}: 不存在
     */
    public static boolean isFileExists(String filePath) {
        return isFileExists(new File(filePath));
    }


    /**
     * 判断文件是否存在
     *
     * @param file 文件
     * @return {@code true}: 存在<br>{@code false}: 不存在
     */
    public static boolean isFileExists(File file) {
        return file != null && file.exists();
    }

    public static class TimeCalculator {
        long start;

        public TimeCalculator() {
            start = SystemClock.elapsedRealtime();
        }

        public long end() {
            return SystemClock.elapsedRealtime() - start;
        }
    }
}