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package com.carrotsearch.ant.tasks.junit4;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

import org.junit.runner.Description;

/**
 * Formatting utilities for consistency across code.
 */
public final class FormattingUtils {
    /* */
    public static String padTo(int columns, String text, String ellipsis) {
        if (text.length() < columns) {
            return text;
        }

        text = ellipsis + text.substring(text.length() - (columns - ellipsis.length()));
        return text;
    }

    public static String padEnd(String string, int minLength, char padChar) {
        if (string.length() >= minLength) {
            return string;
        }
        StringBuilder sb = new StringBuilder(minLength);
        sb.append(string);
        for (int i = string.length(); i < minLength; i++) {
            sb.append(padChar);
        }
        return sb.toString();
    }

    public static String formatTime(long timestamp) {
        return new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss", Locale.ROOT).format(new Date(timestamp));
    }

    public static String formatTimestamp(long ts) {
        return new SimpleDateFormat("HH:mm:ss.SSS", Locale.ROOT).format(new Date(ts));
    }

    public static String formatDurationInSeconds(long timeMillis) {
        final int precision;
        if (timeMillis >= 100 * 1000) {
            precision = 0;
        } else if (timeMillis >= 10 * 1000) {
            precision = 1;
        } else {
            precision = 2;
        }
        return String.format(Locale.ROOT, "%4." + precision + "fs", timeMillis / 1000.0);
    }

    public static String formatDescription(Description description) {
        return formatDescription(description, false);
    }

    public static String formatDescription(Description description, boolean fullNames) {
        StringBuilder buffer = new StringBuilder();
        String className = description.getClassName();
        if (className != null) {
            if (fullNames) {
                buffer.append(className);
            } else {
                String [] components = className.split("[\\.]");
                className = components[components.length - 1];
                buffer.append(className);
            }
            if (description.getMethodName() != null) {
                buffer.append(".").append(description.getMethodName());
            } else {
                buffer.append(" (suite)");
            }
        } else {
            if (description.getMethodName() != null) {
                buffer.append(description.getMethodName());
            }
        }
        return buffer.toString();
    }
}