package com.github.dockerjava.netty;

import java.io.IOException;

import java.io.UnsupportedEncodingException;

import java.net.URLEncoder;

import java.nio.charset.Charset;

import java.nio.charset.UnsupportedCharsetException;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.List;

import java.util.Map;

import java.util.Set;

import com.fasterxml.jackson.databind.ObjectMapper;

import com.google.common.collect.ImmutableSet;

import io.netty.handler.codec.http.HttpConstants;

import org.apache.commons.lang.StringUtils;

import com.google.common.collect.ImmutableList;

import com.google.common.collect.ImmutableMap;

/**

* This class is basically a replacement of {@link javax.ws.rs.client.WebTarget} to allow simpler migration of JAX-RS code to a netty based

* implementation.

*

* @author Marcus Linke

*/

public class WebTarget {

private static final ObjectMapper MAPPER = new ObjectMapper();

private final ChannelProvider channelProvider;

private final ImmutableList<String> path;

private final ImmutableMap<String, String> queryParams;

/**

* Multiple values for the same name param.

*/

private final ImmutableMap<String, Set<String>> queryParamsSet;

private static final String PATH_SEPARATOR = "/";

public WebTarget(ChannelProvider channelProvider) {

this(channelProvider, ImmutableList.<String>of(), ImmutableMap.<String, String>of(),

ImmutableMap.<String, Set<String>>of());

}

private WebTarget(ChannelProvider channelProvider,

ImmutableList<String> path,

ImmutableMap<String, String> queryParams,

ImmutableMap<String, Set<String>> queryParamsSet) {

this.channelProvider = channelProvider;

this.path = path;

this.queryParams = queryParams;

this.queryParamsSet = queryParamsSet;

}

public WebTarget path(String... components) {

ImmutableList.Builder<String> newPath = ImmutableList.<String>builder().addAll(this.path);

for (String component : components) {

newPath.addAll(Arrays.asList(StringUtils.split(component, PATH_SEPARATOR)));

}

return new WebTarget(channelProvider, newPath.build(), queryParams, queryParamsSet);

}

public InvocationBuilder request() {

String resource = PATH_SEPARATOR + StringUtils.join(path, PATH_SEPARATOR);

List<String> params = new ArrayList<>();

for (Map.Entry<String, String> entry : queryParams.entrySet()) {

params.add(entry.getKey() + "=" + encodeComponent(entry.getValue(), HttpConstants.DEFAULT_CHARSET));

}

for (Map.Entry<String, Set<String>> entry : queryParamsSet.entrySet()) {

for (String entryValueValue : entry.getValue()) {

params.add(entry.getKey() + "=" + encodeComponent(entryValueValue, HttpConstants.DEFAULT_CHARSET));

}

}

if (!params.isEmpty()) {

resource = resource + "?" + StringUtils.join(params, "&");

}

return new InvocationBuilder(channelProvider, resource);

}

/**

* @see io.netty.handler.codec.http.QueryStringEncoder

*/

private static String encodeComponent(String s, Charset charset) {

// TODO: Optimize me.

try {

return URLEncoder.encode(s, charset.name()).replace("+", "%20");

} catch (UnsupportedEncodingException ignored) {

throw new UnsupportedCharsetException(charset.name());

}

}

public WebTarget resolveTemplate(String name, Object value) {

ImmutableList.Builder<String> newPath = ImmutableList.builder();

for (String component : path) {

component = component.replaceAll("\\{" + name + "\\}", value.toString());

newPath.add(component);

}

return new WebTarget(channelProvider, newPath.build(), queryParams, queryParamsSet);

}

public WebTarget queryParam(String name, Object value) {

ImmutableMap.Builder<String, String> builder = ImmutableMap.<String, String>builder().putAll(queryParams);

if (value != null) {

builder.put(name, value.toString());

}

return new WebTarget(channelProvider, path, builder.build(), queryParamsSet);

}

public WebTarget queryParamsSet(String name, Set<?> values) {

ImmutableMap.Builder<String, Set<String>> builder = ImmutableMap.<String, Set<String>>builder().putAll(queryParamsSet);

if (values != null) {

ImmutableSet.Builder<String> valueBuilder = ImmutableSet.builder();

for (Object value : values) {

valueBuilder.add(value.toString());

}

builder.put(name, valueBuilder.build());

}

return new WebTarget(channelProvider, path, queryParams, builder.build());

}

public WebTarget queryParamsJsonMap(String name, Map<String, String> values) {

if (values != null && !values.isEmpty()) {

try {

// when param value is JSON string

return queryParam(name, MAPPER.writeValueAsString(values));

} catch (IOException e) {

throw new RuntimeException(e);

}

} else {

return this;

}

}

@Override

public boolean equals(Object o) {

if (this == o) {

return true;

}

if (o == null || getClass() != o.getClass()) {

return false;

}

WebTarget webTarget = (WebTarget) o;

if (channelProvider != null ? !channelProvider.equals(webTarget.channelProvider) : webTarget.channelProvider != null) {

return false;

}

if (path != null ? !path.equals(webTarget.path) : webTarget.path != null) {

return false;

}

if (queryParams != null ? !queryParams.equals(webTarget.queryParams) : webTarget.queryParams != null) {

return false;

}

if (queryParamsSet != null ? !queryParamsSet.equals(webTarget.queryParamsSet) : webTarget.queryParamsSet != null) {

return false;

}

return true;

}

@Override

public int hashCode() {

int result = channelProvider != null ? channelProvider.hashCode() : 0;

result = 31 * result + (path != null ? path.hashCode() : 0);

result = 31 * result + (queryParams != null ? queryParams.hashCode() : 0);

result = 31 * result + (queryParamsSet != null ? queryParamsSet.hashCode() : 0);

return result;

}

}