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package com.github.datalking.util;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.StringTokenizer;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * 字符串工具类
 *
 * @author yaoo on 4/3/18
 */
public abstract class StringUtils {

    private static final String FOLDER_SEPARATOR = "/";

    private static final String WINDOWS_FOLDER_SEPARATOR = "\\";

    private static final String TOP_PATH = "..";

    private static final String CURRENT_PATH = ".";

    private static final char EXTENSION_SEPARATOR = '.';

    public static String[] toStringArray(Enumeration enumeration) {
        if (enumeration == null) {
            return null;
        }
        List list = Collections.list(enumeration);
        return list.toArray(new String[list.size()]);
    }

    public static String[] toStringArray(Collection c) {
        if (c == null) {
            return null;
        }
        return c.toArray(new String[c.size()]);
    }

    public static boolean isEmpty(String str) {
        return (str == null || "".equals(str));
    }

    public static boolean isEmpty(Object str) {
        return (str == null || "".equals(str));
    }

    public static boolean isNotEmpty(String str) {
        return (str != null && str.length() > 0);
    }

    public static String getBeanNameFromSetMethod(String setMethodName) {
        String s = setMethodName.substring(3);
        return firstLetterLowerCase(s);
    }

    public static String firstLetterUpperCase(String original) {
        Assert.notNull(original, "输入字符串不能为空");
        String result = "";
        result = String.valueOf(Character.toUpperCase(original.charAt(0)));
        if (original.length() > 1) {
            result += original.substring(1);
        }
        return result;
    }

    public static String firstLetterLowerCase(String original) {
        Assert.notNull(original, "输入字符串不能为空");
        String result = "";
        result = String.valueOf(Character.toLowerCase(original.charAt(0)));
        if (original.length() > 1) {
            result += original.substring(1);
        }
        return result;
    }

    public static String replace(String inString, String oldPattern, String newPattern) {

        if (!hasLength(inString) || !hasLength(oldPattern) || newPattern == null) {
            return inString;
        }
        int index = inString.indexOf(oldPattern);
        if (index == -1) {
            // no occurrence -> can return input as-is
            return inString;
        }

        int capacity = inString.length();
        if (newPattern.length() > oldPattern.length()) {
            capacity += 16;
        }
        StringBuilder sb = new StringBuilder(capacity);

        int pos = 0;  // our position in the old string
        int patLen = oldPattern.length();
        while (index >= 0) {
            sb.append(inString.substring(pos, index));
            sb.append(newPattern);
            pos = index + patLen;
            index = inString.indexOf(oldPattern, pos);
        }

        // append any characters to the right of a match
        sb.append(inString.substring(pos));
        return sb.toString();
    }

    public static boolean hasLength(String str) {
        return hasLength((CharSequence) str);
    }

    public static boolean hasLength(CharSequence str) {
        return (str != null && str.length() > 0);
    }

    public static boolean hasText(String input) {

        return input != null && input.trim().length() > 0;
    }

    public static String[] tokenizeToStringArray(String str, String delimiters, boolean trimTokens, boolean ignoreEmptyTokens) {

        if (str == null) {
            return null;
        }

        StringTokenizer st = new StringTokenizer(str, delimiters);
        List tokens = new ArrayList<>();
        while (st.hasMoreTokens()) {
            String token = st.nextToken();
            if (trimTokens) {
                token = token.trim();
            }
            if (!ignoreEmptyTokens || token.length() > 0) {
                tokens.add(token);
            }
        }
        return tokens.toArray(new String[tokens.size()]);
    }

    public static String[] tokenizeToStringArray(String str, String delimiters) {
        return tokenizeToStringArray(str, delimiters, true, true);
    }

    public static String trimWhitespace(String str) {
        if (!hasLength(str)) {
            return str;
        }

        StringBuilder sb = new StringBuilder(str);
        while (sb.length() > 0 && Character.isWhitespace(sb.charAt(0))) {
            sb.deleteCharAt(0);
        }
        while (sb.length() > 0 && Character.isWhitespace(sb.charAt(sb.length() - 1))) {
            sb.deleteCharAt(sb.length() - 1);
        }
        return sb.toString();
    }

    public static String[] commaDelimitedListToStringArray(String str) {
        return delimitedListToStringArray(str, ",");
    }

    public static String[] delimitedListToStringArray(String str, String delimiter) {
        return delimitedListToStringArray(str, delimiter, null);
    }

    public static String[] delimitedListToStringArray(String str, String delimiter, String charsToDelete) {
        if (str == null) {
            return new String[0];
        }
        if (delimiter == null) {
            return new String[]{str};
        }

        List result = new ArrayList<>();
        if ("".equals(delimiter)) {
            for (int i = 0; i < str.length(); i++) {
                result.add(deleteAny(str.substring(i, i + 1), charsToDelete));
            }
        } else {
            int pos = 0;
            int delPos;
            while ((delPos = str.indexOf(delimiter, pos)) != -1) {
                result.add(deleteAny(str.substring(pos, delPos), charsToDelete));
                pos = delPos + delimiter.length();
            }
            if (str.length() > 0 && pos <= str.length()) {
                // Add rest of String, but not in case of empty input.
                result.add(deleteAny(str.substring(pos), charsToDelete));
            }
        }
        return result.toArray(new String[result.size()]);
    }

    public static String deleteAny(String inString, String charsToDelete) {
        if (!hasLength(inString) || !hasLength(charsToDelete)) {
            return inString;
        }

        StringBuilder sb = new StringBuilder(inString.length());
        for (int i = 0; i < inString.length(); i++) {
            char c = inString.charAt(i);
            if (charsToDelete.indexOf(c) == -1) {
                sb.append(c);
            }
        }
        return sb.toString();
    }

    public static int countWordFromStr1(String srcText, String keyword) {
        int count = 0;
        Pattern p = Pattern.compile(keyword);
        Matcher m = p.matcher(srcText);
        while (m.find()) {
            count++;
        }
        return count;
    }

    public static int countWordFromStr(String srcText, String keyword) {
        int count = 0;
        int len = srcText.length();
        int j = 0;
        for (int i = 0; i < len; i++) {
            if (srcText.charAt(i) == keyword.charAt(j)) {
                j++;
                if (j == keyword.length()) {
                    count++;
                    j = 0;
                }
            } else {
                i = i - j;
                j = 0;
            }
        }

        return count;
    }


    public static boolean pathEquals(String path1, String path2) {
        return cleanPath(path1).equals(cleanPath(path2));
    }

    public static String cleanPath(String path) {
        if (path == null) {
            return null;
        }
        String pathToUse = replace(path, WINDOWS_FOLDER_SEPARATOR, FOLDER_SEPARATOR);

        int prefixIndex = pathToUse.indexOf(":");
        String prefix = "";
        if (prefixIndex != -1) {
            prefix = pathToUse.substring(0, prefixIndex + 1);
            if (prefix.contains("/")) {
                prefix = "";
            } else {
                pathToUse = pathToUse.substring(prefixIndex + 1);
            }
        }
        if (pathToUse.startsWith(FOLDER_SEPARATOR)) {
            prefix = prefix + FOLDER_SEPARATOR;
            pathToUse = pathToUse.substring(1);
        }

        String[] pathArray = delimitedListToStringArray(pathToUse, FOLDER_SEPARATOR);
        List pathElements = new LinkedList();
        int tops = 0;

        for (int i = pathArray.length - 1; i >= 0; i--) {
            String element = pathArray[i];
            if (CURRENT_PATH.equals(element)) {
                // Points to current directory - drop it.
            } else if (TOP_PATH.equals(element)) {
                // Registering top path found.
                tops++;
            } else {
                if (tops > 0) {
                    // Merging path element with element corresponding to top path.
                    tops--;
                } else {
                    // Normal path element found.
                    pathElements.add(0, element);
                }
            }
        }

        // Remaining top paths need to be retained.
        for (int i = 0; i < tops; i++) {
            pathElements.add(0, TOP_PATH);
        }

        return prefix + collectionToDelimitedString(pathElements, FOLDER_SEPARATOR);
    }

    public static String applyRelativePath(String path, String relativePath) {
        int separatorIndex = path.lastIndexOf(FOLDER_SEPARATOR);
        if (separatorIndex != -1) {
            String newPath = path.substring(0, separatorIndex);
            if (!relativePath.startsWith(FOLDER_SEPARATOR)) {
                newPath += FOLDER_SEPARATOR;
            }
            return newPath + relativePath;
        } else {
            return relativePath;
        }
    }

    public static String collectionToCommaDelimitedString(Collection coll) {
        return collectionToDelimitedString(coll, ",");
    }

    public static String collectionToDelimitedString(Collection coll, String delim) {
        return collectionToDelimitedString(coll, delim, "", "");
    }

    public static String collectionToDelimitedString(Collection coll, String delim, String prefix, String suffix) {
        if (CollectionUtils.isEmpty(coll)) {
            return "";
        }
        StringBuilder sb = new StringBuilder();
        Iterator it = coll.iterator();
        while (it.hasNext()) {
            sb.append(prefix).append(it.next()).append(suffix);
            if (it.hasNext()) {
                sb.append(delim);
            }
        }
        return sb.toString();
    }

    public static int countOccurrencesOf(String str, String sub) {
        if (str == null || sub == null || str.length() == 0 || sub.length() == 0) {
            return 0;
        }
        int count = 0;
        int pos = 0;
        int idx;
        while ((idx = str.indexOf(sub, pos)) != -1) {
            ++count;
            pos = idx + sub.length();
        }
        return count;
    }

    public static String getFilename(String path) {
        if (path == null) {
            return null;
        }
        int separatorIndex = path.lastIndexOf(FOLDER_SEPARATOR);
        return (separatorIndex != -1 ? path.substring(separatorIndex + 1) : path);
    }

    public static String getFilenameExtension(String path) {
        if (path == null) {
            return null;
        }
        int extIndex = path.lastIndexOf(EXTENSION_SEPARATOR);
        if (extIndex == -1) {
            return null;
        }
        int folderIndex = path.lastIndexOf(FOLDER_SEPARATOR);
        if (folderIndex > extIndex) {
            return null;
        }
        return path.substring(extIndex + 1);
    }

    public static String stripFilenameExtension(String path) {
        if (path == null) {
            return null;
        }
        int extIndex = path.lastIndexOf(EXTENSION_SEPARATOR);
        if (extIndex == -1) {
            return path;
        }
        int folderIndex = path.lastIndexOf(FOLDER_SEPARATOR);
        if (folderIndex > extIndex) {
            return path;
        }
        return path.substring(0, extIndex);
    }

    public static String arrayToCommaDelimitedString(Object[] arr) {
        return arrayToDelimitedString(arr, ",");
    }

    public static String arrayToDelimitedString(Object[] arr, String delim) {
        if (ObjectUtils.isEmpty(arr)) {
            return "";
        }
        if (arr.length == 1) {
            return ObjectUtils.nullSafeToString(arr[0]);
        }
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < arr.length; i++) {
            if (i > 0) {
                sb.append(delim);
            }
            sb.append(arr[i]);
        }
        return sb.toString();
    }

    public static String trimAllWhitespace(String str) {
        if (!hasLength(str)) {
            return str;
        }
        StringBuilder sb = new StringBuilder(str);
        int index = 0;
        while (sb.length() > index) {
            if (Character.isWhitespace(sb.charAt(index))) {
                sb.deleteCharAt(index);
            } else {
                index++;
            }
        }
        return sb.toString();
    }

    public static String[] trimArrayElements(String[] array) {
        if (ObjectUtils.isEmpty(array)) {
            return new String[0];
        }
        String[] result = new String[array.length];
        for (int i = 0; i < array.length; i++) {
            String element = array[i];
            result[i] = (element != null ? element.trim() : null);
        }
        return result;
    }

    public static String uncapitalize(String str) {
        return changeFirstCharacterCase(str, false);
    }

    private static String changeFirstCharacterCase(String str, boolean capitalize) {
        if (str == null || str.length() == 0) {
            return str;
        }
        StringBuilder sb = new StringBuilder(str.length());
        if (capitalize) {
            sb.append(Character.toUpperCase(str.charAt(0)));
        } else {
            sb.append(Character.toLowerCase(str.charAt(0)));
        }
        sb.append(str.substring(1));
        return sb.toString();
    }

    public static String[] sortStringArray(String[] array) {
        if (ObjectUtils.isEmpty(array)) {
            return new String[0];
        }
        Arrays.sort(array);
        return array;
    }

    public static String trimLeadingWhitespace(String str) {
        if (!hasLength(str)) {
            return str;
        }
        StringBuilder sb = new StringBuilder(str);
        while (sb.length() > 0 && Character.isWhitespace(sb.charAt(0))) {
            sb.deleteCharAt(0);
        }
        return sb.toString();
    }

    public static String trimTrailingWhitespace(String str) {
        if (!hasLength(str)) {
            return str;
        }
        StringBuilder sb = new StringBuilder(str);
        while (sb.length() > 0 && Character.isWhitespace(sb.charAt(sb.length() - 1))) {
            sb.deleteCharAt(sb.length() - 1);
        }
        return sb.toString();
    }

    public static boolean substringMatch(CharSequence str, int index, CharSequence substring) {
        for (int j = 0; j < substring.length(); j++) {
            int i = index + j;
            if (i >= str.length() || str.charAt(i) != substring.charAt(j)) {
                return false;
            }
        }
        return true;
    }

    public static String capitalize(String str) {
        return changeFirstCharacterCase(str, true);
    }

}