package org.unicode.cldr.unittest;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
import java.util.TreeSet;
import java.util.regex.Matcher;

import org.unicode.cldr.util.CLDRFile;
import org.unicode.cldr.util.CLDRPaths;
import org.unicode.cldr.util.CldrUtility;
import org.unicode.cldr.util.DtdType;
import org.unicode.cldr.util.PatternCache;
import org.unicode.cldr.util.XMLFileReader;
import org.unicode.cldr.util.XMLFileReader.SimpleHandler;
import org.unicode.cldr.util.XPathParts;

import com.ibm.icu.dev.test.TestFmwk;
import com.ibm.icu.impl.Relation;
import com.ibm.icu.impl.Row;
import com.ibm.icu.impl.Row.R2;
import com.ibm.icu.impl.Row.R3;
import com.ibm.icu.text.Normalizer2;
import com.ibm.icu.text.UnicodeSet;

public class TestPathsModule extends TestFmwk {

    public static void main(String[] args) {
        new TestPathsModule().run(args);
    }

    private static final Matcher FILE_FILTER = PatternCache.get(
        CldrUtility.getProperty("file", ".?")).matcher("");
    private static final Matcher PATH_FILTER = PatternCache.get(
        CldrUtility.getProperty("path", ".?")).matcher("");
    private static final Matcher VALUE_FILTER = PatternCache.get(
        CldrUtility.getProperty("value", ".?")).matcher("");
    private static final Matcher TEST_FILTER = PatternCache.get(
        CldrUtility.getProperty("test", ".?")).matcher("");

    public void TestMain() throws IOException {
        Map<String, Exception> cantRead = new LinkedHashMap<String, Exception>();
        List<PathTest> tests = new ArrayList<PathTest>();
        tests.add(new DistinguishingText());
        tests.add(new GatherValueCharacters());

        // filter out the tests we don't want
        for (Iterator<PathTest> it = tests.iterator(); it.hasNext();) {
            PathTest item = it.next();
            if (!TEST_FILTER.reset(item.getClass().getName()).find()) {
                it.remove();
            }
        }

        // Only test against /main for now.
        File dir = new File(CLDRPaths.MAIN_DIRECTORY);
        for (File file : dir.listFiles()) {
            String fullFileName = file.getCanonicalPath();
            String filename = file.getName();
            if (filename.startsWith("#") || !filename.endsWith(".xml")
                || !FILE_FILTER.reset(filename).find())
                continue;
            String name = dir.getName() + "/" + file.getName();
            name = name.substring(0, name.length() - 4); // strip .xml
            MyHandler myHandler = new MyHandler(dir, filename, tests);
            try {
                XMLFileReader reader = new XMLFileReader()
                .setHandler(myHandler);
                reader.read(fullFileName, XMLFileReader.CONTENT_HANDLER, true);
            } catch (Exception e) {
                cantRead.put(name, e);
            }
        }

        for (String name : cantRead.keySet()) {
            Exception exception = cantRead.get(name);
            errln(name + "\t" + exception.getMessage() + "\t"
                + Arrays.asList(exception.getStackTrace()));
        }
        for (PathTest test : tests) {
            test.finish();
        }
    }

    private class MyHandler extends SimpleHandler {
        final List<PathTest> tests;

        final XPathParts fullParts = new XPathParts();

        public MyHandler(File dir, String filename, List<PathTest> tests2) {
            tests = tests2;
            for (PathTest test : tests) {
                test.start(dir, filename);
            }
        }

        public void handlePathValue(String path, String value) {
            if (!PATH_FILTER.reset(path).find()) {
                return;
            }
            if (!VALUE_FILTER.reset(value).find()) {
                return;
            }
            fullParts.set(path);
            for (PathTest test : tests) {
                test.test(fullParts, value);
            }
        }

    }

    private static class PathTest {
        protected DtdType dtdType;
        protected String locale;
        protected File dir;

        public void start(File dir, String locale) {
            this.dir = dir;
            this.locale = locale;
            this.dtdType = null;
        }

        public void test(XPathParts fullParts, String value) {
            if (dtdType == null) {
                dtdType = DtdType.valueOf(fullParts.getElement(0));
            }
        }

        public void finish() {

        }
    }

    private static final Normalizer2 nfkd = Normalizer2.getInstance(null,
        "nfc", Normalizer2.Mode.DECOMPOSE);
    private static final UnicodeSet nonspacing = new UnicodeSet(
        "[[:Mn:][:Me:]]");

    private class GatherValueCharacters extends PathTest {
        UnicodeSet chars = new UnicodeSet();

        UnicodeSet temp = new UnicodeSet();

        @Override
        public void test(XPathParts fullParts, String value) {
            super.test(fullParts, value);
            if (value.length() == 0) {
                return;
            }
            String draftValue = fullParts.findFirstAttributeValue("draft");
            if (draftValue != null) {
                if (draftValue.equals("unconfirmed")
                    || draftValue.equals("provisional")) {
                    return;
                }
            }
            temp.clear().addAll(value).addAll(nfkd.normalize(value))
            .retainAll(nonspacing);
            if (!chars.containsAll(temp)) {
                chars.addAll(temp);
                logln("Adding\t" + temp + "\t" + dir + "\t" + locale);
            }
        }

        @Override
        public void finish() {
            super.finish();
        }
    }

    private enum OrderedChildren {
        all, some, none
    }

    /**
     * This test checks for the following:
     * <ul>
     * <li>Non-distinguishing attributes must only be on leaf nodes</li>
     * <li>If an element is ordered, then its children must be.</li>
     * </ul>
     * Note that a leaf node is a final one OR the last one before any ordered
     * element.
     */
    private class DistinguishingText extends PathTest {
        private Relation<R3<DtdType, String, String>, String> nonFinalNonDistingishing = Relation
            .of(new TreeMap<R3<DtdType, String, String>, Set<String>>(),
                TreeSet.class);

        private Relation<R2<DtdType, String>, String> illFormedOrder = Relation
            .of(new TreeMap<R2<DtdType, String>, Set<String>>(),
                TreeSet.class);

        private Map<String, OrderedChildren> orderedChildrenStatus = new TreeMap<String, OrderedChildren>();

        public void test(XPathParts fullParts, String value) {
            super.test(fullParts, value);
            int size = fullParts.size();
            int firstQ = findFirstQ(fullParts, size);
            int firstLeaf = firstQ >= 0 ? firstQ : size - 1;
            for (int i = 0; i < size; ++i) {
                String element = fullParts.getElement(i);
                boolean leafElement = i == firstLeaf;
                for (String attribute : fullParts.getAttributes(i).keySet()) {
                    boolean distinguishing = CLDRFile.isDistinguishing(dtdType,
                        element, attribute);
                    if (!leafElement && !distinguishing) {
                        R3<DtdType, String, String> row = Row.of(dtdType,
                            element, attribute);
                        nonFinalNonDistingishing.put(row, locale);
                        // System.out.println("Non-Distinguishing, non-final:\t"
                        // + row);
                    }
                }
            }
        }

        /**
         * Get the first ordered element, AND make a number of consistency
         * checks.
         *
         * @param fullParts
         * @param size
         * @return -1 if no _q, otherwise index of first _q
         */
        private int findFirstQ(XPathParts fullParts, int size) {
            int firstQ = -1;
            String lastElement = "";
            for (int i = 0; i < size; ++i) {
                String element = fullParts.getElement(i);
                boolean hasq = CLDRFile.isOrdered(element, dtdType);
                // check that all children have consistent ordering status
                OrderedChildren status = orderedChildrenStatus.get(lastElement);
                if (status == null) {
                    orderedChildrenStatus.put(lastElement,
                        hasq ? OrderedChildren.all : OrderedChildren.none);
                } else
                    switch (status) {
                    case all:
                        if (!hasq)
                            orderedChildrenStatus.put(lastElement,
                                OrderedChildren.some);
                        break;
                    case none:
                        if (hasq)
                            orderedChildrenStatus.put(lastElement,
                                OrderedChildren.some);
                        break;
                    }
                // find the first ordered element AND check that its children
                // are all ordered
                if (hasq) {
                    if (firstQ < 0) {
                        firstQ = i;
                    }
                } else {
                    if (firstQ >= 0) { // missing!
                        R2<DtdType, String> row = Row.of(dtdType, element);
                        illFormedOrder.put(row, locale);
                    }
                }
                lastElement = element;
            }
            return firstQ;
        }

        public void finish() {
            super.finish();
            for (R3<DtdType, String, String> item : nonFinalNonDistingishing
                .keySet()) {
                List<String> samples = new ArrayList<String>(
                    nonFinalNonDistingishing.getAll(item));
                if (samples.size() > 5)
                    samples = samples.subList(0, 4);
                errln(item.get0() + ": Attribute <" + item.get2()
                    + "> in element <" + item.get1()
                    + "> is not on leaf element and not distinguishing:\t"
                    + samples);
            }
            for (R2<DtdType, String> item : illFormedOrder.keySet()) {
                List<String> samples = new ArrayList<String>(
                    illFormedOrder.getAll(item));
                if (samples.size() > 5) {
                    samples = samples.subList(0, 4);
                    samples.set(4, "...");
                }
                errln("Child of ordered element is not ordered:\t" + item
                    + "\t" + samples);
            }
            for (String element : orderedChildrenStatus.keySet()) {
                OrderedChildren status = orderedChildrenStatus.get(element);
                if (status == OrderedChildren.some) {
                    errln("Brother of ordered element is not ordered items not consistent:\t"
                        + element);
                }
            }
        }
    }
}
