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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2009, Red Hat Middleware LLC, and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jboss.shrinkwrap.impl.base.path;

import java.util.logging.Level;
import java.util.logging.Logger;

import org.jboss.shrinkwrap.api.ArchivePath;

/**
 * A Path which may be optionally prefixed with some common namespace context at construction time. Thread-safe.
 *
 * @author ALR
 * @author Aslak Knutsen
 * @version $Revision: $
 */
public class BasicPath implements ArchivePath, Comparable {

    // -------------------------------------------------------------------------------------||
    // Class Members ----------------------------------------------------------------------||
    // -------------------------------------------------------------------------------------||

    /**
     * Logger
     */
    private static final Logger log = Logger.getLogger(BasicPath.class.getName());

    // -------------------------------------------------------------------------------------||
    // Instance Members -------------------------------------------------------------------||
    // -------------------------------------------------------------------------------------||

    /**
     * The context which this path represents; immutable so we're thread-safe.
     */
    private final String context;

    // -------------------------------------------------------------------------------------||
    // Constructor ------------------------------------------------------------------------||
    // -------------------------------------------------------------------------------------||

    /**
     * Creates a new Path representing the root context
     */
    public BasicPath() {
        this(null);
    }

    /**
     * Creates a new Path with the specified context
     *
     * @param context
     *            The context which this path represents. Null or blank represents the root. Relative paths will be
     *            adjusted to absolute form.
     */
    public BasicPath(final String context) {
        final String resolvedContext = PathUtil.optionallyPrependSlash(context);
        if (log.isLoggable(Level.FINER)) {
            log.finer("Resolved \"" + context + "\" to absolute form: " + resolvedContext);
        }
        this.context = resolvedContext;
    }

    /**
     * Creates a new Path using the specified base and specified relative context.
     *
     * @param basePath
     * @param context
     */
    public BasicPath(final ArchivePath basePath, final ArchivePath context) {
        this(basePath, context.get());
    }

    /**
     * Creates a new Path using the specified base and specified relative context.
     *
     * @param basePath
     * @param context
     */
    public BasicPath(final ArchivePath basePath, final String context) {
        this(basePath.get(), context);
    }

    /**
     * Creates a new Path using the specified base and specified relative context.
     *
     * @param basePath
     * @param context
     */
    public BasicPath(final String basePath, final ArchivePath context) {
        this(basePath, context.get());
    }

    /**
     * Creates a new Path using the specified base and specified relative context.
     *
     * @param basePath
     * @param context
     */
    public BasicPath(final String basePath, String context) {
        this(PathUtil.composeAbsoluteContext(basePath, context));
    }

    // -------------------------------------------------------------------------------------||
    // Required Implementations -----------------------------------------------------------||
    // -------------------------------------------------------------------------------------||

    /**
     * {@inheritDoc}
     *
     * @see org.jboss.shrinkwrap.api.ArchivePath#get()
     */
    @Override
    public String get() {
        return context;
    }

    /**
     * {@inheritDoc}
     *
     * @see org.jboss.shrinkwrap.api.ArchivePath#getParent()
     */
    @Override
    public ArchivePath getParent() {
        return PathUtil.getParent(this);
    }

    /**
     * {@inheritDoc}
     *
     * @see java.lang.Comparable#compareTo(java.lang.Object)
     */
    @Override
    public int compareTo(final ArchivePath path) {
        // If a null argument, we're greater
        if (path == null) {
            return 1;
        }
        /*
         * Check for parent relationship
         */
        final ArchivePath parentOfSpecified = PathUtil.getParent(path);
        final ArchivePath parentOfThis = PathUtil.getParent(this);
        // If we're the parent of the specified, we're less
        if (this.equals(parentOfSpecified)) {
            return -1;
        }
        // If the specified if the parent of us, we're more
        if (path.equals(parentOfThis)) {
            return 1;
        }

        // Just delegate to underlying contexts
        final int comparedContexts = path.get().compareTo(this.get());

        // Return the inverted value of the contents (in this ordering, less is more)
        final int adjusted = 0 - comparedContexts;
        return adjusted;
    }

    // -------------------------------------------------------------------------------------||
    // Overridden Implementations ---------------------------------------------------------||
    // -------------------------------------------------------------------------------------||

    /**
     * {@inheritDoc}
     *
     * @see java.lang.Object#hashCode()
     */
    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((context == null) ? 0 : context.hashCode());
        return result;
    }

    /**
     * {@inheritDoc}
     *
     * @see java.lang.Object#equals(java.lang.Object)
     */
    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        final BasicPath other = (BasicPath) obj;

        if (context == null) {
            if (other.context != null) {
                return false;
            }
        }

        // Ensure we treat following slashes equally
        final String adjustedContext = PathUtil.optionallyRemoveFollowingSlash(context);
        final String adjustedOther = PathUtil.optionallyRemoveFollowingSlash(other.context);
        if (!adjustedContext.equals(adjustedOther)) {
            return false;
        }

        // No match
        return true;
    }

    /**
     * {@inheritDoc}
     *
     * @see java.lang.Object#toString()
     */
    @Override
    public String toString() {
        return this.getClass().getSimpleName() + " [context=" + context + "]";
    }

}