/*******************************************************************************
 * Copyright (c) 2000, 2008 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.che.ide.ext.java.client.core.quickfix;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.Arrays;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

/**
 *
 */
public class StringAsserts {
    /**
     *
     */
    public StringAsserts() {
        super();
    }

    private static int getDiffPos(String str1, String str2) {
        int len1 = Math.min(str1.length(), str2.length());

        int diffPos = -1;
        for (int i = 0; i < len1; i++) {
            if (str1.charAt(i) != str2.charAt(i)) {
                diffPos = i;
                break;
            }
        }
        if (diffPos == -1 && str1.length() != str2.length()) {
            diffPos = len1;
        }
        return diffPos;
    }

    private static final int printRange = 6;

    public static void assertEqualString(String actual, String expected) {
        if (actual == null || expected == null) {
            if (actual == expected) {
                return;
            }
            if (actual == null) {
                assertTrue("Content not as expected: is 'null' expected: " + expected, false);
            } else {
                assertTrue("Content not as expected: expected 'null' is: " + actual, false);
            }
        }

        int diffPos = getDiffPos(actual, expected);
        if (diffPos != -1) {
            int diffAhead = Math.max(0, diffPos - printRange);
            int diffAfter = Math.min(actual.length(), diffPos + printRange);

            String diffStr = actual.substring(diffAhead, diffPos) + '^' + actual.substring(diffPos, diffAfter);

            // use detailed message
            String message = "Content not as expected: is\n" + actual + "\nDiffers at pos " + diffPos + ": " + diffStr + "\nexpected:\n" +
                             expected;  //$NON-NLS-1$//$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$

            assertEquals(message, expected, actual);
        }
    }

    public static void assertEqualStringIgnoreDelim(String actual, String expected) throws IOException {
        if (actual == null || expected == null) {
            if (actual == expected) {
                return;
            }
            if (actual == null) {
                assertTrue("Content not as expected: is 'null' expected: " + expected, false);
            } else {
                assertTrue("Content not as expected: expected 'null' is: " + actual, false);
            }
        }

        BufferedReader read1 = new BufferedReader(new StringReader(actual));
        BufferedReader read2 = new BufferedReader(new StringReader(expected));

        int line = 1;
        do {
            String s1 = read1.readLine();
            String s2 = read2.readLine();

            if (s1 == null || !s1.equals(s2)) {
                if (s1 == null && s2 == null) {
                    return;
                }
                String diffStr = (s1 == null) ? s2 : s1;

                String message = "Content not as expected: Content is: \n" + actual + "\nDiffers at line " + line + ": " + diffStr +
                                 "\nExpected contents: \n" + expected;
                assertEquals(message, expected, actual);
            }
            line++;
        } while (true);
    }

    public static void assertEqualStringsIgnoreOrder(String[] actuals, String[] expecteds) {
        ArrayList list1 = new ArrayList(Arrays.asList(actuals));
        ArrayList list2 = new ArrayList(Arrays.asList(expecteds));

        for (int i = list1.size() - 1; i >= 0; i--) {
            if (list2.remove(list1.get(i))) {
                list1.remove(i);
            }
        }

        int n1 = list1.size();
        int n2 = list2.size();

        if (n1 + n2 > 0) {
            if (n1 == 1 && n2 == 1) {
                assertEqualString((String)list1.get(0), (String)list2.get(0));
            }

            StringBuffer buf = new StringBuffer();
            for (int i = 0; i < n1; i++) {
                String s1 = (String)list1.get(i);
                if (s1 != null) {
                    buf.append(s1);
                    buf.append("\n");
                }
            }
            String actual = buf.toString();

            buf = new StringBuffer();
            for (int i = 0; i < n2; i++) {
                String s2 = (String)list2.get(i);
                if (s2 != null) {
                    buf.append(s2);
                    buf.append("\n");
                }
            }
            String expected = buf.toString();

            String message = "Content not as expected: Content is: \n" + actual + "\nExpected contents: \n" + expected;
            assertEquals(message, expected, actual);
        }
    }

    public static void assertExpectedExistInProposals(String[] actuals, String[] expecteds) {
        ArrayList list1 = new ArrayList(Arrays.asList(actuals));
        ArrayList list2 = new ArrayList(Arrays.asList(expecteds));

        for (int i = list1.size() - 1; i >= 0; i--) {
            if (list2.remove(list1.get(i))) {
                list1.remove(i);
            }
        }

        int n1 = list1.size();
        int n2 = list2.size();

        if (n2 > 0) {
            if (n1 == 1 && n2 == 1) {
                assertEqualString((String)list1.get(0), (String)list2.get(0));
            }

            StringBuffer buf = new StringBuffer();
            for (int i = 0; i < n1; i++) {
                String s1 = (String)list1.get(i);
                if (s1 != null) {
                    buf.append(s1);
                    buf.append("\n");
                }
            }
            String actual = buf.toString();

            buf = new StringBuffer();
            for (int i = 0; i < n2; i++) {
                String s2 = (String)list2.get(i);
                if (s2 != null) {
                    buf.append(s2);
                    buf.append("\n");
                }
            }
            String expected = buf.toString();

            String message = "Content not as expected: Content is: \n" + actual + "\nExpected contents: \n" + expected;
            assertEquals(message, expected, actual);
        }
    }

}