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/*
 * 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.sshd.common.scp;

import java.io.Serializable;
import java.util.Objects;

import org.apache.sshd.common.auth.MutableUserHolder;
import org.apache.sshd.common.util.GenericUtils;
import org.apache.sshd.common.util.OsUtils;
import org.apache.sshd.common.util.ValidateUtils;

/**
 * Represents a local or remote SCP location in the format {@code user@host:path} for a remote path and a simple path
 * for a local one. If user is omitted for a remote path then current user is used.
 * 
 * @author Apache MINA SSHD Project
 */
public class ScpLocation implements MutableUserHolder, Serializable, Cloneable {
    public static final char HOST_PART_SEPARATOR = ':';
    public static final char USERNAME_PART_SEPARATOR = '@';

    private static final long serialVersionUID = 5450230457030600136L;

    private String host;
    private String username;
    private String path;

    public ScpLocation() {
        this(null);
    }

    /**
     * @param  locSpec                  The location specification - ignored if {@code null}/empty
     * @see                             #update(String, ScpLocation)
     * @throws IllegalArgumentException if invalid specification
     */
    public ScpLocation(String locSpec) {
        update(locSpec, this);
    }

    public String getHost() {
        return host;
    }

    public void setHost(String host) {
        this.host = host;
    }

    public boolean isLocal() {
        return GenericUtils.isEmpty(getHost());
    }

    @Override
    public String getUsername() {
        return username;
    }

    @Override
    public void setUsername(String username) {
        this.username = username;
    }

    /**
     * Resolves the effective username to use for a remote location. If username not set then uses the current username
     *
     * @return The resolved username
     * @see    #getUsername()
     * @see    OsUtils#getCurrentUser()
     */
    public String resolveUsername() {
        String user = getUsername();
        if (GenericUtils.isEmpty(user)) {
            return OsUtils.getCurrentUser();
        } else {
            return user;
        }
    }

    public String getPath() {
        return path;
    }

    public void setPath(String path) {
        this.path = path;
    }

    @Override
    public int hashCode() {
        return Objects.hash(getHost(), resolveUsername(), OsUtils.getComparablePath(getPath()));
    }

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

        ScpLocation other = (ScpLocation) obj;
        if (this.isLocal() != other.isLocal()) {
            return false;
        }

        String thisPath = OsUtils.getComparablePath(getPath());
        String otherPath = OsUtils.getComparablePath(other.getPath());
        if (!Objects.equals(thisPath, otherPath)) {
            return false;
        }

        if (isLocal()) {
            return true;
        }

        // we know other is also remote or we would not have reached this point
        return Objects.equals(resolveUsername(), other.resolveUsername())
                && Objects.equals(getHost(), other.getHost());
    }

    @Override
    public ScpLocation clone() {
        try {
            return getClass().cast(super.clone());
        } catch (CloneNotSupportedException e) { // unexpected
            throw new RuntimeException("Failed to clone " + toString(), e);
        }
    }

    @Override
    public String toString() {
        String p = getPath();
        if (isLocal()) {
            return p;
        }

        return resolveUsername()
               + Character.toString(USERNAME_PART_SEPARATOR)
               + getHost()
               + Character.toString(HOST_PART_SEPARATOR)
               + p;
    }

    /**
     * Parses a local or remote SCP location in the format {@code user@host:path}
     *
     * @param  locSpec                  The location specification - ignored if {@code null}/empty
     * @return                          The {@link ScpLocation} or {@code null} if no specification provider
     * @throws IllegalArgumentException if invalid specification
     * @see                             #update(String, ScpLocation)
     */
    public static ScpLocation parse(String locSpec) {
        return GenericUtils.isEmpty(locSpec) ? null : update(locSpec, new ScpLocation());
    }

    /**
     * Parses a local or remote SCP location in the format {@code user@host:path}
     *
     * @param                        Type of {@link ScpLocation} being updated
     * @param  locSpec                  The location specification - ignored if {@code null}/empty
     * @param  location                 The {@link ScpLocation} to update - never {@code null}
     * @return                          The updated location (unless no specification)
     * @throws IllegalArgumentException if invalid specification
     */
    public static  L update(String locSpec, L location) {
        Objects.requireNonNull(location, "No location to update");
        if (GenericUtils.isEmpty(locSpec)) {
            return location;
        }

        location.setHost(null);
        location.setUsername(null);

        int pos = locSpec.indexOf(HOST_PART_SEPARATOR);
        if (pos < 0) { // assume a local path
            location.setPath(locSpec);
            return location;
        }

        /*
         * NOTE !!! in such a case there may be confusion with a host named 'a', but there is a limit to how smart we
         * can be...
         */
        if ((pos == 1) && OsUtils.isWin32()) {
            char drive = locSpec.charAt(0);
            if (((drive >= 'a') && (drive <= 'z')) || ((drive >= 'A') && (drive <= 'Z'))) {
                location.setPath(locSpec);
                return location;
            }
        }

        String login = locSpec.substring(0, pos);
        ValidateUtils.checkTrue(pos < (locSpec.length() - 1), "Invalid remote specification (missing path): %s", locSpec);
        location.setPath(locSpec.substring(pos + 1));

        pos = login.indexOf(USERNAME_PART_SEPARATOR);
        ValidateUtils.checkTrue(pos != 0, "Invalid remote specification (missing username): %s", locSpec);
        if (pos < 0) {
            location.setHost(login);
        } else {
            location.setUsername(login.substring(0, pos));
            ValidateUtils.checkTrue(pos < (login.length() - 1), "Invalid remote specification (missing host): %s", locSpec);
            location.setHost(login.substring(pos + 1));
        }

        return location;
    }
}