package com.github.dockerjava.api.model;

import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.builder.EqualsBuilder;
import org.apache.commons.lang.builder.HashCodeBuilder;

import com.github.dockerjava.api.command.InspectContainerResponse.NetworkSettings;
import com.github.dockerjava.api.model.Ports.Binding;

/**
 * In a {@link PortBinding}, a network socket on the Docker host, expressed as a {@link Binding}, is bound to an
 * {@link ExposedPort} of a container. A {@link PortBinding} corresponds to the <code>--publish</code> (<code>-p</code>)
 * option of the <code>docker run</code> (and similar) CLI command for adding port bindings to a container.
 * <p>
 * <i>Note: This is an abstraction used for creating new port bindings. It is not to be confused with the abstraction
 * used for querying existing port bindings from a container configuration in {@link NetworkSettings#getPorts()} and
 * {@link HostConfig#getPortBindings()}. In that context, a <code>Map&lt;ExposedPort, Binding[]&gt;</code> is used.</i>
 */
public class PortBinding {
    private final Binding binding;

    private final ExposedPort exposedPort;

    public PortBinding(Binding binding, ExposedPort exposedPort) {
        this.binding = binding;
        this.exposedPort = exposedPort;
    }

    public Binding getBinding() {
        return binding;
    }

    public ExposedPort getExposedPort() {
        return exposedPort;
    }

    public static PortBinding parse(String serialized) throws IllegalArgumentException {
        try {
            String[] parts = StringUtils.splitByWholeSeparator(serialized, ":");
            switch (parts.length) {
            case 3:
                // 127.0.0.1:80:8080/tcp
                return createFromSubstrings(parts[0] + ":" + parts[1], parts[2]);
            case 2:
                // 80:8080 // 127.0.0.1::8080
                return createFromSubstrings(parts[0], parts[1]);
            case 1:
                // 8080
                return createFromSubstrings("", parts[0]);
            default:
                throw new IllegalArgumentException();
            }
        } catch (Exception e) {
            throw new IllegalArgumentException("Error parsing PortBinding '" + serialized + "'", e);
        }
    }

    private static PortBinding createFromSubstrings(String binding, String exposedPort) throws IllegalArgumentException {
        return new PortBinding(Binding.parse(binding), ExposedPort.parse(exposedPort));
    }

    @Override
    public boolean equals(Object obj) {
        if (obj instanceof PortBinding) {
            PortBinding other = (PortBinding) obj;
            return new EqualsBuilder().append(binding, other.getBinding()).append(exposedPort, other.getExposedPort())
                    .isEquals();
        } else
            return super.equals(obj);
    }

    @Override
    public int hashCode() {
        return new HashCodeBuilder().append(binding).append(exposedPort).toHashCode();
    }

}
