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/*******************************************************************************
 * Copyright (c) 2015 Red Hat, Inc. Distributed under license by Red Hat, Inc.
 * All rights reserved. This program is made available under the terms of the
 * Eclipse Public License v1.0 which accompanies this distribution, and is
 * available at http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors: Red Hat, Inc.
 ******************************************************************************/

package com.openshift.restclient.images;

/**
 * ImageUri is an immutable representation of a full image tag in accordance
 * with with Docker conventions [REGISTRYHOST/][USERNAME/]NAME[:TAG]
 */
public class DockerImageURI {

    public static final String LATEST = "latest";
    private String registryHost;
    private String userName;
    private String name;
    private String tag;

    public DockerImageURI(String registryHost, String userName, String name) {
        this(registryHost, userName, name, LATEST);
    }

    public DockerImageURI(String registryHost, String userName, String name, String imageTag) {
        this.registryHost = registryHost;
        this.userName = userName;
        this.name = name;
        this.tag = imageTag;
    }

    public DockerImageURI(String tag) {
        if (tag != null) {
            String[] segments = tag.split("/");
            switch (segments.length) {
            case 3:
                registryHost = segments[0];
                userName = segments[1];
                setNameAndTag(segments[2]);
                break;
            case 2:
                userName = segments[0];
                setNameAndTag(segments[1]);
                break;
            default:
                setNameAndTag(segments[0]);
                break;
            }
        }
    }

    private void setNameAndTag(String nameAndTag) {
        String[] nameTag = nameAndTag.split(":");
        if (nameTag.length == 2) {
            name = nameTag[0];
            tag = nameTag[1];
        } else {
            name = nameTag[0];
            tag = LATEST;
        }
    }

    @Override
    public String toString() {
        return getAbsoluteUri();
    }

    public String getName() {
        return this.name;
    }

    public String getTag() {
        return this.tag;
    }

    public String getUserName() {
        return this.userName;
    }

    public String getRepositoryHost() {
        return this.registryHost;
    }

    /**
     * Get the docker tag as repo:9999/username/name:tag
     * 
     */
    public String getAbsoluteUri() {
        return buildUri(registryHost, userName, name, tag);
    }

    /**
     * Get the docker tag as username/name:tag only
     * 
     */
    public String getBaseUri() {
        return buildUri(null, userName, name, tag);
    }

    /**
     * Get the docker tag as username/name only
     * 
     */
    public String getUriUserNameAndName() {
        return buildUri(null, userName, name, null);
    }

    /**
     * Get the docker tag as repo:9999/username/name only
     * 
     */
    public String getUriWithoutTag() {
        return buildUri(registryHost, userName, name, null);
    }

    /**
     * Get the docker tag as username/name:tag only
     * 
     */
    public String getUriWithoutHost() {
        return buildUri(null, userName, name, tag);
    }

    /**
     * Get the docker tag as name:tag only
     * 
     */
    public String getNameAndTag() {
        return buildUri(null, null, name, tag);
    }

    private String buildUri(String host, String user, String name, String tag) {
        StringBuilder b = new StringBuilder();
        if (host != null) {
            b.append(host).append("/");
        }
        if (user != null) {
            b.append(user).append("/");
        }
        b.append(name);
        if (tag != null) {
            b.append(":").append(tag);
        }
        return b.toString();
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((name == null) ? 0 : name.hashCode());
        result = prime * result + ((registryHost == null) ? 0 : registryHost.hashCode());
        result = prime * result + ((tag == null) ? 0 : tag.hashCode());
        result = prime * result + ((userName == null) ? 0 : userName.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        DockerImageURI other = (DockerImageURI) obj;
        if (name == null) {
            if (other.name != null) {
                return false;
            }
        } else if (!name.equals(other.name)) {
            return false;
        }
        if (registryHost == null) {
            if (other.registryHost != null) {
                return false;
            }
        } else if (!registryHost.equals(other.registryHost)) {
            return false;
        }
        if (tag == null) {
            if (other.tag != null) {
                return false;
            }
        } else if (!tag.equals(other.tag)) {
            return false;
        }
        if (userName == null) {
            if (other.userName != null) {
                return false;
            }
        } else if (!userName.equals(other.userName)) {
            return false;
        }
        return true;
    }

}