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package io.sphere.internal.request;

import com.google.common.base.Charsets;
import com.google.common.collect.HashMultimap;
import com.google.common.collect.Multimap;
import com.google.common.util.concurrent.ListenableFuture;
import com.ning.http.client.AsyncHttpClient;
import com.ning.http.client.AsyncCompletionHandler;
import com.ning.http.client.FluentStringsMap;
import io.sphere.internal.ListenableFutureAdapter;
import io.sphere.internal.Version;
import io.sphere.internal.util.Util;

import java.util.List;
import java.util.Map;

/** A request holder that does real HTTP requests. Can be mocked in tests. */
public class RequestHolderImpl implements RequestHolder {
    private final AsyncHttpClient.BoundRequestBuilder httpRequestBuilder;

    public RequestHolderImpl(AsyncHttpClient.BoundRequestBuilder httpRequestBuilder) {
        this.httpRequestBuilder = httpRequestBuilder;
        this.httpRequestBuilder.setHeader("User-Agent", "Sphere Java client, version " + Version.version);
        this.httpRequestBuilder.setBodyEncoding(Charsets.UTF_8.name());
    }

    public RequestHolderImpl addQueryParameter(String name, String value) {
        httpRequestBuilder.addQueryParameter(name, value);
        return this;
    }

    public RequestHolderImpl setBody(String requestBody) {
        httpRequestBuilder.setBody(requestBody);
        return this;
    }

    public ListenableFuture> executeRequest(AsyncCompletionHandler> onResponse) throws Exception {
        // Send HTTP request
        return new ListenableFutureAdapter>(httpRequestBuilder.execute(onResponse));
    }

    /** The URL the request will be sent to, for debugging purposes. */
    public String getUrl() {
        return Util.getDecodedUrl(httpRequestBuilder.build());
    }

    /** The HTTP method of the request, for debugging purposes. */
    public String getMethod() {
        return httpRequestBuilder.build().getMethod();
    }

    /** The body of the request, for debugging purposes. */
    public String getBody() {
        return httpRequestBuilder.build().getStringData();
    }

    /** The query parameters of the request, for debugging purposes. */
    public Multimap getQueryParams() {
        FluentStringsMap params = httpRequestBuilder.build().getQueryParams();
        Multimap converted = HashMultimap.create();
        for (Map.Entry> param: params) {
            converted.putAll(param.getKey(), param.getValue());
        }
        return converted;
    }

    @Override
    public String toString() {
        return "RequestHolderImpl{" +
                "method=" + getMethod() +
                ", url=" + getUrl() +
                ", body=" + getBody() +
                '}';
    }
}