/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.maven.shared.artifact.filter;

import java.util.ArrayList;
import java.util.List;

import org.apache.maven.artifact.Artifact;
import org.apache.maven.artifact.DefaultArtifact;
import org.apache.maven.artifact.resolver.filter.ArtifactFilter;
import org.slf4j.Logger;

/**
 * <p>
 * {@link ArtifactFilter} implementation that selects artifacts based on their scopes.
 * </p>
 * <strong>NOTE:</strong> None of the fine-grained scopes imply other scopes when enabled;
 * when fine-grained scope control is used, each scope must be enabled separately,
 * UNLESS the corresponding XXXWithImplications() method is used to enable that
 * scope.
 */
public class ScopeArtifactFilter implements ArtifactFilter, StatisticsReportingArtifactFilter {
    private boolean includeCompileScope;

    private boolean includeRuntimeScope;

    private boolean includeTestScope;

    private boolean includeProvidedScope;

    private boolean includeSystemScope;

    private boolean includeNullScope = true;

    private boolean nullScopeHit = false;

    private boolean compileScopeHit = false;

    private boolean runtimeScopeHit = false;

    private boolean testScopeHit = false;

    private boolean providedScopeHit = false;

    private boolean systemScopeHit = false;

    private final List<String> filteredArtifactIds = new ArrayList<>();

    /**
     * Constructor that is meant to be used with fine-grained manipulation to
     * enable/disable specific scopes using the associated mutator methods.
     */
    public ScopeArtifactFilter() {
        // don't enable anything by default.
        this(null);
    }

    /**
     * Constructor that uses the implied nature of Maven scopes to determine which
     * artifacts to include. For instance, 'test' scope implies compile, provided, and runtime,
     * while 'runtime' scope implies only compile.
     *
     * @param scope the scope
     */
    public ScopeArtifactFilter(String scope) {
        if (DefaultArtifact.SCOPE_COMPILE.equals(scope)) {
            setIncludeCompileScopeWithImplications(true);
        } else if (DefaultArtifact.SCOPE_RUNTIME.equals(scope)) {
            setIncludeRuntimeScopeWithImplications(true);
        } else if (DefaultArtifact.SCOPE_TEST.equals(scope)) {
            setIncludeTestScopeWithImplications(true);
        } else if (DefaultArtifact.SCOPE_PROVIDED.equals(scope)) {
            setIncludeProvidedScope(true);
        } else if (DefaultArtifact.SCOPE_SYSTEM.equals(scope)) {
            setIncludeSystemScope(true);
        }
    }

    /** {@inheritDoc} */
    public boolean include(Artifact artifact) {
        boolean result = true;

        if (artifact.getScope() == null) {
            nullScopeHit = true;
            result = includeNullScope;
        } else if (Artifact.SCOPE_COMPILE.equals(artifact.getScope())) {
            compileScopeHit = true;
            result = includeCompileScope;
        } else if (Artifact.SCOPE_RUNTIME.equals(artifact.getScope())) {
            runtimeScopeHit = true;
            result = includeRuntimeScope;
        } else if (Artifact.SCOPE_TEST.equals(artifact.getScope())) {
            testScopeHit = true;
            result = includeTestScope;
        } else if (Artifact.SCOPE_PROVIDED.equals(artifact.getScope())) {
            providedScopeHit = true;
            result = includeProvidedScope;
        } else if (Artifact.SCOPE_SYSTEM.equals(artifact.getScope())) {
            systemScopeHit = true;
            result = includeSystemScope;
        }

        if (!result) {
            // We have to be very careful with artifacts that have ranges,
            // because DefaultArtifact.getId() as of <= 2.1.0-M1 will throw a NPE
            // if a range is specified.
            String id;
            if (artifact.getVersionRange() != null) {
                id = artifact.getDependencyConflictId() + ":" + artifact.getVersionRange();
            } else {
                id = artifact.getId();
            }

            filteredArtifactIds.add(id);
        }

        return result;
    }

    /**
     * <p>toString.</p>
     *
     * @return Information converted to a string.
     */
    public String toString() {
        return "Scope filter [null-scope=" + includeNullScope + ", compile=" + includeCompileScope + ", runtime="
                + includeRuntimeScope + ", test=" + includeTestScope + ", provided=" + includeProvidedScope
                + ", system="
                + includeSystemScope + "]";
    }

    /** {@inheritDoc} */
    public void reportFilteredArtifacts(Logger logger) {
        if (!filteredArtifactIds.isEmpty() && logger.isDebugEnabled()) {
            StringBuilder buffer = new StringBuilder("The following artifacts were removed by this filter: ");

            for (String artifactId : filteredArtifactIds) {
                buffer.append('\n').append(artifactId);
            }

            logger.debug(buffer.toString());
        }
    }

    /** {@inheritDoc} */
    public void reportMissedCriteria(Logger logger) {
        if (logger.isDebugEnabled()) {
            StringBuilder buffer = new StringBuilder();

            boolean report = false;
            if (!nullScopeHit) {
                buffer.append("\no [Null Scope]");
                report = true;
            }
            if (!compileScopeHit) {
                buffer.append("\no Compile");
                report = true;
            }
            if (!runtimeScopeHit) {
                buffer.append("\no Runtime");
                report = true;
            }
            if (!testScopeHit) {
                buffer.append("\no Test");
                report = true;
            }
            if (!providedScopeHit) {
                buffer.append("\no Provided");
                report = true;
            }
            if (!systemScopeHit) {
                buffer.append("\no System");
                report = true;
            }

            if (report && logger.isDebugEnabled()) {
                logger.debug("The following scope filters were not used: " + buffer);
            }
        }
    }

    /**
     * {@inheritDoc}
     *
     * @return a boolean.
     */
    public boolean hasMissedCriteria() {
        return !nullScopeHit
                || !compileScopeHit
                || !runtimeScopeHit
                || !testScopeHit
                || !providedScopeHit
                || !systemScopeHit;
    }

    /**
     * <p>isIncludeCompileScope.</p>
     *
     * @return {@link #includeCompileScope}
     */
    public boolean isIncludeCompileScope() {
        return includeCompileScope;
    }

    /**
     * <p>Setter for the field <code>includeCompileScope</code>.</p>
     *
     * @param pIncludeCompileScope true/false.
     * @return {@link org.apache.maven.shared.artifact.filter.ScopeArtifactFilter}
     */
    public ScopeArtifactFilter setIncludeCompileScope(boolean pIncludeCompileScope) {
        this.includeCompileScope = pIncludeCompileScope;

        return this;
    }

    /**
     * <p>isIncludeRuntimeScope.</p>
     *
     * @return {@link #includeRuntimeScope}
     */
    public boolean isIncludeRuntimeScope() {
        return includeRuntimeScope;
    }

    /**
     * <p>Setter for the field <code>includeRuntimeScope</code>.</p>
     *
     * @param pIncludeRuntimeScope true/false
     * @return {@link org.apache.maven.shared.artifact.filter.ScopeArtifactFilter}
     */
    public ScopeArtifactFilter setIncludeRuntimeScope(boolean pIncludeRuntimeScope) {
        this.includeRuntimeScope = pIncludeRuntimeScope;

        return this;
    }

    /**
     * <p>isIncludeTestScope.</p>
     *
     * @return {@link #includeTestScope}
     */
    public boolean isIncludeTestScope() {
        return includeTestScope;
    }

    /**
     * <p>Setter for the field <code>includeTestScope</code>.</p>
     *
     * @param pIncludeTestScope {@link #includeTestScope}
     * @return {@link org.apache.maven.shared.artifact.filter.ScopeArtifactFilter}
     */
    public ScopeArtifactFilter setIncludeTestScope(boolean pIncludeTestScope) {
        this.includeTestScope = pIncludeTestScope;

        return this;
    }

    /**
     * <p>isIncludeProvidedScope.</p>
     *
     * @return {@link #includeProvidedScope}
     */
    public boolean isIncludeProvidedScope() {
        return includeProvidedScope;
    }

    /**
     * <p>Setter for the field <code>includeProvidedScope</code>.</p>
     *
     * @param pIncludeProvidedScope yes/no.
     * @return {@link #ScopeArtifactFilter()}
     */
    public ScopeArtifactFilter setIncludeProvidedScope(boolean pIncludeProvidedScope) {
        this.includeProvidedScope = pIncludeProvidedScope;

        return this;
    }

    /**
     * <p>isIncludeSystemScope.</p>
     *
     * @return {@link #includeSystemScope}
     */
    public boolean isIncludeSystemScope() {
        return includeSystemScope;
    }

    /**
     * {@inheritDoc}
     *
     * @param pIncludeSystemScope a boolean.
     * @return a {@link org.apache.maven.shared.artifact.filter.ScopeArtifactFilter} object.
     */
    public ScopeArtifactFilter setIncludeSystemScope(boolean pIncludeSystemScope) {
        this.includeSystemScope = pIncludeSystemScope;

        return this;
    }

    /**
     * Manages the following scopes:
     *
     * <ul>
     *   <li>system</li>
     *   <li>provided</li>
     *   <li>compile</li>
     * </ul>
     *
     * @param enabled whether specified scopes should be included
     * @return this instance
     */
    public ScopeArtifactFilter setIncludeCompileScopeWithImplications(boolean enabled) {
        includeSystemScope = enabled;
        includeProvidedScope = enabled;
        includeCompileScope = enabled;

        return this;
    }

    /**
     * Manages the following scopes:
     *
     * <ul>
     *   <li>compile</li>
     *   <li>runtime</li>
     * </ul>
     *
     * @param enabled whether specified scopes should be included
     * @return this instance
     */
    public ScopeArtifactFilter setIncludeRuntimeScopeWithImplications(boolean enabled) {
        includeCompileScope = enabled;
        includeRuntimeScope = enabled;

        return this;
    }

    /**
     * Manages the following scopes:
     *
     * <ul>
     *   <li>system</li>
     *   <li>provided</li>
     *   <li>compile</li>
     *   <li>runtime</li>
     *   <li>test</li>
     * </ul>
     *
     * @param enabled whether specified scopes should be included
     * @return this instance
     */
    public ScopeArtifactFilter setIncludeTestScopeWithImplications(boolean enabled) {
        includeSystemScope = enabled;
        includeProvidedScope = enabled;
        includeCompileScope = enabled;
        includeRuntimeScope = enabled;
        includeTestScope = enabled;

        return this;
    }

    /**
     * Determine whether artifacts that have a null scope are included or excluded.
     *
     * @param enable whether null-scope should be included
     * @return this instance
     */
    public ScopeArtifactFilter setIncludeNullScope(boolean enable) {
        includeNullScope = enable;

        return this;
    }

    /**
     * Reset hit counts and tracking of filtered artifacts, BUT NOT ENABLED SCOPES.
     *
     * @return this instance
     */
    public ScopeArtifactFilter reset() {
        compileScopeHit = false;
        runtimeScopeHit = false;
        testScopeHit = false;
        providedScopeHit = false;
        systemScopeHit = false;
        filteredArtifactIds.clear();

        return this;
    }
}