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/*******************************************************************************
 * Copyright (c) 2015 Jeff Martin.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Lesser General Public
 * License v3.0 which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/lgpl.html
 * <p>
 * Contributors:
 * Jeff Martin - initial API and implementation
 ******************************************************************************/
package cuchaz.enigma.convert;

import java.io.*;
import java.nio.charset.Charset;
import java.util.Map;

import cuchaz.enigma.mapping.BehaviorEntry;
import cuchaz.enigma.mapping.ClassEntry;
import cuchaz.enigma.mapping.Entry;
import cuchaz.enigma.mapping.FieldEntry;


public class MatchesWriter {

    public static void writeClasses(ClassMatches matches, File file)
            throws IOException {
        try (OutputStreamWriter out = new OutputStreamWriter(new FileOutputStream(file), Charset.forName("UTF-8"))) {
            for (ClassMatch match : matches) {
                writeClassMatch(out, match);
            }
        }
    }

    private static void writeClassMatch(OutputStreamWriter out, ClassMatch match)
            throws IOException {
        writeClasses(out, match.sourceClasses);
        out.write(":");
        writeClasses(out, match.destClasses);
        out.write("\n");
    }

    private static void writeClasses(OutputStreamWriter out, Iterable<ClassEntry> classes)
            throws IOException {
        boolean isFirst = true;
        for (ClassEntry entry : classes) {
            if (isFirst) {
                isFirst = false;
            } else {
                out.write(",");
            }
            out.write(entry.toString());
        }
    }

    public static <T extends Entry> void writeMembers(MemberMatches<T> matches, File file)
            throws IOException {
        try (OutputStreamWriter out = new OutputStreamWriter(new FileOutputStream(file), Charset.forName("UTF-8"))) {
            for (Map.Entry<T, T> match : matches.matches().entrySet()) {
                writeMemberMatch(out, match.getKey(), match.getValue());
            }
            for (T entry : matches.getUnmatchedSourceEntries()) {
                writeMemberMatch(out, entry, null);
            }
            for (T entry : matches.getUnmatchedDestEntries()) {
                writeMemberMatch(out, null, entry);
            }
            for (T entry : matches.getUnmatchableSourceEntries()) {
                writeUnmatchableEntry(out, entry);
            }
        }
    }

    private static <T extends Entry> void writeMemberMatch(OutputStreamWriter out, T source, T dest)
            throws IOException {
        if (source != null) {
            writeEntry(out, source);
        }
        out.write(":");
        if (dest != null) {
            writeEntry(out, dest);
        }
        out.write("\n");
    }

    private static <T extends Entry> void writeUnmatchableEntry(OutputStreamWriter out, T entry)
            throws IOException {
        out.write("!");
        writeEntry(out, entry);
        out.write("\n");
    }

    private static <T extends Entry> void writeEntry(OutputStreamWriter out, T entry)
            throws IOException {
        if (entry instanceof FieldEntry) {
            writeField(out, (FieldEntry) entry);
        } else if (entry instanceof BehaviorEntry) {
            writeBehavior(out, (BehaviorEntry) entry);
        }
    }

    private static void writeField(OutputStreamWriter out, FieldEntry fieldEntry)
            throws IOException {
        out.write(fieldEntry.getClassName());
        out.write(" ");
        out.write(fieldEntry.getName());
        out.write(" ");
        out.write(fieldEntry.getType().toString());
    }

    private static void writeBehavior(OutputStreamWriter out, BehaviorEntry behaviorEntry)
            throws IOException {
        out.write(behaviorEntry.getClassName());
        out.write(" ");
        out.write(behaviorEntry.getName());
        out.write(" ");
        if (behaviorEntry.getSignature() != null) {
            out.write(behaviorEntry.getSignature().toString());
        }
    }
}