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package org.custommonkey.xmlunit.jaxp13;

import org.custommonkey.xmlunit.NamespaceContext;
import org.custommonkey.xmlunit.SimpleNamespaceContext;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import javax.xml.XMLConstants;

import junit.framework.TestCase;

/**
 * JUnit test for XMLUnitNamespaceContext2Jaxp13
 */
public class test_XMLUnitNamespaceContext2Jaxp13 extends TestCase {
    private static final String[] PREFIXES = {"foo", "bar"};
    private static final String[] STANDARD_PREFIXES = {
        XMLConstants.XML_NS_PREFIX, XMLConstants.XMLNS_ATTRIBUTE
    };
    private static final String[] STANDARD_URIS = {
        XMLConstants.XML_NS_URI, XMLConstants.XMLNS_ATTRIBUTE_NS_URI
    };
    private static final String URI = "urn:example";

    public void testBasics() {
        XMLUnitNamespaceContext2Jaxp13 ctx =
            new XMLUnitNamespaceContext2Jaxp13(new SimpleNamespaceContext(setupMap()));
        validate(ctx);
    }

    public void testCannotOverrideStandardPrefixes() {
        Map<String, String> m = setupMap();
        for (String standardPrefix : STANDARD_PREFIXES) {
            m.put(standardPrefix, URI);
        }
        XMLUnitNamespaceContext2Jaxp13 ctx =
            new XMLUnitNamespaceContext2Jaxp13(new SimpleNamespaceContext(m));
        validate(ctx);
    }

    public void testCannotOverrideStandardURIs() {
        Map<String, String> m = setupMap();
        for (int i = 0; i < STANDARD_PREFIXES.length; i++) {
            m.put(STANDARD_PREFIXES[i] + "1", STANDARD_URIS[i]);
        }
        XMLUnitNamespaceContext2Jaxp13 ctx =
            new XMLUnitNamespaceContext2Jaxp13(new SimpleNamespaceContext(m));
        validate(ctx);
    }

    public void testDefaultNamespaceHandling() {
        Map<String, String> m = setupMap();
        m.put("", URI);
        XMLUnitNamespaceContext2Jaxp13 ctx =
            new XMLUnitNamespaceContext2Jaxp13(new SimpleNamespaceContext(m));
        
        // no matter how many prefixes map to it, DEFAULT_NS must be
        // the first prefix
        assertEquals(XMLConstants.DEFAULT_NS_PREFIX, ctx.getPrefix(URI));

        Iterator it = ctx.getPrefixes(URI);
        assertTrue(it.hasNext());
        assertEquals(XMLConstants.DEFAULT_NS_PREFIX, it.next());
        assertAllPrefixesFound(it);
    }

    private static Map<String, String> setupMap() {
        Map<String, String> map = new HashMap<String, String>();
        for (String prefix : PREFIXES) {
            map.put(prefix, URI);
        }
        return map;
    }

    private static void validate(XMLUnitNamespaceContext2Jaxp13 ctx) {
        for (int i = 0; i < PREFIXES.length; i++) {
            assertEquals(URI, ctx.getNamespaceURI(PREFIXES[i]));
        }
        for (int i = 0; i < STANDARD_PREFIXES.length; i++) {
            assertEquals(STANDARD_URIS[i],
                         ctx.getNamespaceURI(STANDARD_PREFIXES[i]));
        }
        assertEquals(XMLConstants.NULL_NS_URI,
                     ctx.getNamespaceURI(PREFIXES[0] + PREFIXES[0]));
        assertEquals(XMLConstants.NULL_NS_URI,
                     ctx.getNamespaceURI(XMLConstants.DEFAULT_NS_PREFIX));
        
        boolean foundThisPrefix = false;
        String prefix = ctx.getPrefix(URI);
        for (int i = 0; !foundThisPrefix && i < PREFIXES.length; i++) {
            if (PREFIXES[i].equals(prefix)) {
                foundThisPrefix = true;
            }
        }
        assertTrue("getPrefix returned a known prefix for " + URI,
                   foundThisPrefix);
        for (int i = 0; i < STANDARD_PREFIXES.length; i++) {
            assertEquals(STANDARD_PREFIXES[i], ctx.getPrefix(STANDARD_URIS[i]));
        }

        assertAllPrefixesFound(ctx.getPrefixes(URI));
        for (int i = 0; i < STANDARD_PREFIXES.length; i++) {
            Iterator it = ctx.getPrefixes(STANDARD_URIS[i]);
            assertTrue("One element for " + STANDARD_URIS[i], it.hasNext());
            assertEquals(STANDARD_PREFIXES[i], it.next());
            assertFalse("Only one element for " + STANDARD_URIS[i],
                        it.hasNext());
        }

        assertNull(ctx.getPrefix(URI + URI));
        assertFalse(ctx.getPrefixes(URI + URI).hasNext());
    }

    private static void assertAllPrefixesFound(Iterator it) {
        boolean[] found = new boolean[PREFIXES.length];
        int count = 0;
        while (it.hasNext()) {
            count++;
            String p = (String) it.next();
            boolean foundThisPrefix = false;
            for (int i = 0; !foundThisPrefix && i < PREFIXES.length; i++) {
                if (PREFIXES[i].equals(p)) {
                    found[i] = foundThisPrefix = true;
                }
            }
            if (!foundThisPrefix) {
                fail("Prefix " + p + " should not be in this context");
            }
        }
        assertEquals(PREFIXES.length, count);
        for (int i = 0; i < PREFIXES.length; i++) {
            assertTrue("Context contained " + PREFIXES[i], found[i]);
        }
    }
}
