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package org.apache.maven.artifact.repository.layout;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.List;
import java.util.StringTokenizer;
import java.io.InputStream;
import java.io.File;

import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
import org.xml.sax.InputSource;

public class MavenJPackageDepmap {

	private static  MavenJPackageDepmap instance;
	private static Hashtable jppArtifactMap;
        /**
         *
         * @author Stanislav Ochotnicky <sochotnicky@redhat.com>
         *
         *	  This class is used to wrap around fragments that are mapping
         *	  artifacts to jar files in our _javadir. These used to be
         *	  processed in a macro after every package installation. Fragments
         *	  themselves are not proper xml files (they have no root element)
         *	  so we have to fix them by wrapping them in one root element.
         */
        private static class WrapFragmentStream extends InputStream {
            String startTag = "<deps>";
            String endTag = "</deps>";
            byte fragmentContent[];
            int position;

            WrapFragmentStream(String fragmentPath) throws IOException {
                FileInputStream fin = new FileInputStream(fragmentPath);
                int nBytes = fin.available();
                byte tmpContent[] = new byte[nBytes];
                fin.read(tmpContent);
                fin.close();
                byte startBytes[] = startTag.getBytes();
                byte endBytes[] = endTag.getBytes();
                fragmentContent = new byte[nBytes + startBytes.length
         	       + endBytes.length];
                System.arraycopy(startBytes, 0, fragmentContent, 0,
         	       startBytes.length);
                System.arraycopy(tmpContent, 0, fragmentContent, startBytes.length,
         	       tmpContent.length);
                System.arraycopy(endBytes, 0, fragmentContent, startBytes.length
         	       + tmpContent.length, endBytes.length);
                position = 0;
            }

            public int read() throws IOException {
                if (position < fragmentContent.length) {
         	   return fragmentContent[position++];
                } else {
         	   return -1;
                }
            }
        }

	private MavenJPackageDepmap() {
		jppArtifactMap = new Hashtable();
		buildJppArtifactMap();
	}

	public static MavenJPackageDepmap getInstance() {
		if (instance == null) {
			instance = new MavenJPackageDepmap();
		}

		return instance;
	}

	public Hashtable getMappedInfo(Hashtable mavenDep) {
		return getMappedInfo((String) mavenDep.get("group"),
							(String) mavenDep.get("artifact"),
							(String) mavenDep.get("version"));
	}

	public Hashtable getMappedInfo(String groupId, String artifactId, String version) {

		Hashtable jppDep;
		String idToCheck, jppCombination;

		if (System.getProperty("maven2.ignore.versions") == null && System.getProperty("maven2.jpp.mode") == null) {
			idToCheck = groupId+","+artifactId+","+version;
		} else {
			idToCheck = groupId+","+artifactId;
		}

		jppCombination = (String) jppArtifactMap.get(idToCheck);

		//System.err.println("*** " + groupId+","+artifactId+","+version + " => " + jppCombination);

		jppDep = new Hashtable();
		if (jppCombination != null && jppCombination != "") {

			StringTokenizer st = new StringTokenizer(jppCombination, ",");

			jppDep.put("group", st.nextToken());
			jppDep.put("artifact",st.nextToken());
			jppDep.put("version",st.nextToken());

		} else {
			jppDep.put("group", groupId);
			jppDep.put("artifact", artifactId);
			jppDep.put("version", version);
		}

		return jppDep;
	}


	/**
	 *	Returns whether or not the given dependency should be dropped.
	 */
	public boolean shouldEliminate(String groupId, String artifactId, String version) {
		String idToCheck;

		if (System.getProperty("maven2.ignore.versions") == null && System.getProperty("maven2.jpp.mode") == null) {
			idToCheck = groupId+","+artifactId+","+version;
		} else {
			idToCheck = groupId+","+artifactId;
		}

		return jppArtifactMap.get(idToCheck) != null && jppArtifactMap.get(idToCheck).equals("");

	}

	private static void buildJppArtifactMap() {

                try{
                    if (System.getProperty("maven2.ignore.versions") != null || System.getProperty("maven2.jpp.mode") != null) {
			debug("Processing file: /usr/share/java-utils/xml/maven2-versionless-depmap.xml");
			processDepmapFile(new FileInputStream("/etc/maven/maven2-versionless-depmap.xml"));
                    }
                }
                catch (FileNotFoundException e) {
                    System.err.println("WARNING: Unable to find versionless map" );
                    e.printStackTrace();
                }
                catch (IOException e) {
                    System.err.println("WARNING: I/O exception occured when opening versionless map file");
                    e.printStackTrace();
                }

                // process fragments in etc
                File fragmentDir = new File("/etc/maven/fragments");
                String flist[] = fragmentDir.list();
                if (flist != null) {
                    java.util.Arrays.sort(flist);
                    for (String fragFilename : flist) {
                        try {
                            processDepmapFile(new WrapFragmentStream("/etc/maven/fragments/" + fragFilename));
                        }
                        catch (IOException e) {
                            System.err.println("WARNING: I/O exception occured when opening etc map file" + fragFilename);
                            e.printStackTrace();
                        }
                    }
                }

                // process fragments is usr. Once packages are rebuilt, we can skip
                // fragments in /etc
                fragmentDir = new File("/usr/share/maven-fragments");
                flist = fragmentDir.list();
                if (flist != null) {
                    java.util.Arrays.sort(flist);
                    for (String fragFilename : flist) {
                        try {
                            processDepmapFile(new WrapFragmentStream("/usr/share/maven-fragments/" + fragFilename));
                        }
                        catch (IOException e) {
                            System.err.println("WARNING: I/O exception occured when opening usr map file" + fragFilename);
                            e.printStackTrace();
                        }
                    }
                }

		String customFileName = System.getProperty("maven2.jpp.depmap.file", null);
                try {
                    if (customFileName != null) {
			debug("Processing file: " + customFileName);
			processDepmapFile(new FileInputStream(customFileName));
                    }
                }
                catch (FileNotFoundException e) {
                    System.err.println("ERROR: Unable to find custom map file: " + customFileName);
                    e.printStackTrace();
                }
                catch (IOException e) {
                    System.err.println("ERROR: I/O exception occured when opening map file");
                    e.printStackTrace();
                }
	}

	private static void processDepmapFile(InputStream file) {

		Document mapDocument;

		try {
			mapDocument = (new SAXBuilder()).build(new InputSource(file));
		} catch (IOException ioe) {
			System.err.println("ERROR: I/O exception occured when opening map file");
			ioe.printStackTrace();
			return;
		} catch (JDOMException jde) {
			System.err.println("ERROR: Unable to instantiate parser");
			jde.printStackTrace();
			return;
		}

		List l = mapDocument.getRootElement().getChildren("dependency");

		Iterator i = l.iterator();
		while (i.hasNext()) {
			Element depElement = (Element) i.next();

			Element mElem = depElement.getChild("maven");
			Element jppElem = depElement.getChild("jpp");

			String mG = mElem.getChildText("groupId");
			String mA = mElem.getChildText("artifactId");
			String mV = mElem.getChildText("version");

			// jppElem == null => drop this dependency
			if (jppElem != null) {

				String jppG = jppElem.getChildText("groupId");
				String jppA = jppElem.getChildText("artifactId");
				String jppV = jppElem.getChildText("version");

				if (System.getProperty("maven2.ignore.versions") == null && System.getProperty("maven2.jpp.mode") == null) {
					debug("*** Adding: " + mG+","+mA+","+mV + " => " +  jppG+","+jppA+","+jppV + " to map...");
					jppArtifactMap.put(mG+","+mA+","+mV, jppG+","+jppA+","+jppV);
				} else {
					debug("*** Adding: " + mG+","+mA + " => " +  jppG+","+jppA+","+jppV + " to map...");
					jppArtifactMap.put(mG+","+mA, jppG+","+jppA+","+jppV);
				}
			} else {
					debug("*** Adding: " + mG+","+mA+"," + " => " +  "JPP/maven2,empty-dep,"+mV + " to map...");
					jppArtifactMap.put(mG+","+mA, "JPP/maven2,empty-dep,"+mV);
			}
		}
	}

    private static void debug(String msg) {
        if (System.getProperty("maven2.jpp.debug") != null)
            System.err.println(msg);
    }
}