/*
 * 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.artifact.repository;

import java.io.File;
import java.util.Collections;
import java.util.List;
import java.util.Objects;

import org.apache.maven.artifact.Artifact;
import org.apache.maven.artifact.metadata.ArtifactMetadata;
import org.apache.maven.artifact.repository.layout.ArtifactRepositoryLayout;
import org.apache.maven.repository.Proxy;

/**
 * Abstraction of an artifact repository. Artifact repositories can be remote, local, or even build reactor or
 * IDE workspace.
 */
// TODO completely separate local and remote artifact repositories
public class MavenArtifactRepository implements ArtifactRepository {
    private static final String LS = System.lineSeparator();

    private String id;

    private String url;

    private String basedir;

    private String protocol;

    private ArtifactRepositoryLayout layout;

    private ArtifactRepositoryPolicy snapshots;

    private ArtifactRepositoryPolicy releases;

    private Authentication authentication;

    private Proxy proxy;

    private List<ArtifactRepository> mirroredRepositories = Collections.emptyList();

    private boolean blocked;

    public MavenArtifactRepository() {}

    /**
     * Create a remote download repository.
     *
     * @param id        the unique identifier of the repository
     * @param url       the URL of the repository
     * @param layout    the layout of the repository
     * @param snapshots the policies to use for snapshots
     * @param releases  the policies to use for releases
     */
    public MavenArtifactRepository(
            String id,
            String url,
            ArtifactRepositoryLayout layout,
            ArtifactRepositoryPolicy snapshots,
            ArtifactRepositoryPolicy releases) {
        this.id = id;
        this.url = url;
        this.layout = layout;
        this.snapshots = snapshots;
        this.releases = releases;
        //
        // Derive these from the URL
        //
        this.protocol = protocol(url);
        this.basedir = basedir(url);
    }

    public String pathOf(Artifact artifact) {
        return layout.pathOf(artifact);
    }

    public String pathOfRemoteRepositoryMetadata(ArtifactMetadata artifactMetadata) {
        return layout.pathOfRemoteRepositoryMetadata(artifactMetadata);
    }

    public String pathOfLocalRepositoryMetadata(ArtifactMetadata metadata, ArtifactRepository repository) {
        return layout.pathOfLocalRepositoryMetadata(metadata, repository);
    }

    public void setLayout(ArtifactRepositoryLayout layout) {
        this.layout = layout;
    }

    public ArtifactRepositoryLayout getLayout() {
        return layout;
    }

    public void setSnapshotUpdatePolicy(ArtifactRepositoryPolicy snapshots) {
        this.snapshots = snapshots;
    }

    public ArtifactRepositoryPolicy getSnapshots() {
        return snapshots;
    }

    public void setReleaseUpdatePolicy(ArtifactRepositoryPolicy releases) {
        this.releases = releases;
    }

    public ArtifactRepositoryPolicy getReleases() {
        return releases;
    }

    public String getKey() {
        return getId();
    }

    public String toString() {
        StringBuilder sb = new StringBuilder(256);

        sb.append("      id: ").append(getId()).append(LS);
        sb.append("      url: ").append(getUrl()).append(LS);
        sb.append("   layout: ").append(layout != null ? layout : "none");

        if (proxy != null) {
            sb.append(LS)
                    .append("    proxy: ")
                    .append(proxy.getHost())
                    .append(':')
                    .append(proxy.getPort());
        }

        if (snapshots != null) {
            sb.append(LS).append("snapshots: [enabled => ").append(snapshots.isEnabled());
            sb.append(", update => ").append(snapshots.getUpdatePolicy()).append(']');
        }

        if (releases != null) {
            sb.append(LS).append("releases: [enabled => ").append(releases.isEnabled());
            sb.append(", update => ").append(releases.getUpdatePolicy()).append(']');
        }

        sb.append("   blocked: ").append(isBlocked()).append('\n');

        return sb.toString();
    }

    public Artifact find(Artifact artifact) {
        File artifactFile = new File(getBasedir(), pathOf(artifact));

        // We need to set the file here or the resolver will fail with an NPE, not fully equipped to deal
        // with multiple local repository implementations yet.
        artifact.setFile(artifactFile);

        return artifact;
    }

    public List<String> findVersions(Artifact artifact) {
        return Collections.emptyList();
    }

    public String getId() {
        return id;
    }

    public String getUrl() {
        return url;
    }

    public String getBasedir() {
        return basedir;
    }

    public String getProtocol() {
        return protocol;
    }

    public void setId(String id) {
        this.id = id;
    }

    public void setUrl(String url) {
        this.url = url;

        this.protocol = protocol(url);
        this.basedir = basedir(url);
    }

    // Path Utils

    /**
     * Return the protocol name.
     * <br>
     * E.g: for input
     * <code>http://www.codehaus.org</code> this method will return <code>http</code>
     *
     * @param url the url
     * @return the host name
     */
    private static String protocol(final String url) {
        final int pos = url.indexOf(':');

        if (pos == -1) {
            return "";
        }
        return url.substring(0, pos).trim();
    }

    /**
     * Derive the path portion of the given URL.
     *
     * @param url the repository URL
     * @return the basedir of the repository
     * TODO need to URL decode for spaces?
     */
    private String basedir(String url) {
        String retValue = null;

        if (protocol.equalsIgnoreCase("file")) {
            retValue = url.substring(protocol.length() + 1);
            retValue = decode(retValue);
            // special case: if omitted // on protocol, keep path as is
            if (retValue.startsWith("//")) {
                retValue = retValue.substring(2);

                if (retValue.length() >= 2 && (retValue.charAt(1) == '|' || retValue.charAt(1) == ':')) {
                    // special case: if there is a windows drive letter, then keep the original return value
                    retValue = retValue.charAt(0) + ":" + retValue.substring(2);
                } else {
                    // Now we expect the host
                    int index = retValue.indexOf('/');
                    if (index >= 0) {
                        retValue = retValue.substring(index + 1);
                    }

                    // special case: if there is a windows drive letter, then keep the original return value
                    if (retValue.length() >= 2 && (retValue.charAt(1) == '|' || retValue.charAt(1) == ':')) {
                        retValue = retValue.charAt(0) + ":" + retValue.substring(2);
                    } else if (index >= 0) {
                        // leading / was previously stripped
                        retValue = "/" + retValue;
                    }
                }
            }

            // special case: if there is a windows drive letter using |, switch to :
            if (retValue.length() >= 2 && retValue.charAt(1) == '|') {
                retValue = retValue.charAt(0) + ":" + retValue.substring(2);
            }

            // normalize separators
            retValue = new File(retValue).getPath();
        }

        if (retValue == null) {
            retValue = "/";
        }
        return retValue.trim();
    }

    /**
     * Decodes the specified (portion of a) URL. <strong>Note:</strong> This decoder assumes that ISO-8859-1 is used to
     * convert URL-encoded bytes to characters.
     *
     * @param url The URL to decode, may be <code>null</code>.
     * @return The decoded URL or <code>null</code> if the input was <code>null</code>.
     */
    private static String decode(String url) {
        String decoded = url;
        if (url != null) {
            int pos = -1;
            while ((pos = decoded.indexOf('%', pos + 1)) >= 0) {
                if (pos + 2 < decoded.length()) {
                    String hexStr = decoded.substring(pos + 1, pos + 3);
                    char ch = (char) Integer.parseInt(hexStr, 16);
                    decoded = decoded.substring(0, pos) + ch + decoded.substring(pos + 3);
                }
            }
        }
        return decoded;
    }

    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((getId() == null) ? 0 : getId().hashCode());
        return result;
    }

    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }

        ArtifactRepository other = (ArtifactRepository) obj;

        return eq(getId(), other.getId());
    }

    protected static <T> boolean eq(T s1, T s2) {
        return Objects.equals(s1, s2);
    }

    public Authentication getAuthentication() {
        return authentication;
    }

    public void setAuthentication(Authentication authentication) {
        this.authentication = authentication;
    }

    public Proxy getProxy() {
        return proxy;
    }

    public void setProxy(Proxy proxy) {
        this.proxy = proxy;
    }

    public boolean isBlacklisted() {
        return false;
    }

    public void setBlacklisted(boolean blackListed) {
        // no op
    }

    public boolean isUniqueVersion() {
        return true;
    }

    public boolean isProjectAware() {
        return false;
    }

    public List<ArtifactRepository> getMirroredRepositories() {
        return mirroredRepositories;
    }

    public void setMirroredRepositories(List<ArtifactRepository> mirroredRepositories) {
        if (mirroredRepositories != null) {
            this.mirroredRepositories = Collections.unmodifiableList(mirroredRepositories);
        } else {
            this.mirroredRepositories = Collections.emptyList();
        }
    }

    public boolean isBlocked() {
        return blocked;
    }

    public void setBlocked(boolean blocked) {
        this.blocked = blocked;
    }
}
