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package org.apache.juneau.rest.client;

import static org.apache.juneau.internal.StringUtils.*;

import java.util.*;

import org.apache.http.*;
import org.apache.http.client.entity.*;
import org.apache.http.message.*;
import org.apache.juneau.httppart.*;
import org.apache.juneau.oapi.*;
import org.apache.juneau.urlencoding.*;

/**
 * Convenience class for constructing instances of <c>List&lt;NameValuePair&gt;</c> for the
 * {@link UrlEncodedFormEntity} class.
 *
 * <p>
 * Instances of this method can be passed directly to the {@link RestClient#doPost(Object, Object)} method or
 * {@link RestCall#body(Object)} methods to perform URL-encoded form posts.
 *
 * <h5 class='section'>Example:</h5>
 * <p class='bcode w800'>
 * 	NameValuePairs params = <jk>new</jk> NameValuePairs()
 * 		.append(<js>"j_username"</js>, user)
 * 		.append(<js>"j_password"</js>, pw);
 * 	restClient.doPost(url, params).run();
 * </p>
 */
public final class NameValuePairs extends LinkedList<NameValuePair> {

	private static final long serialVersionUID = 1L;

	/**
	 * Appends the specified pair to the end of this list.
	 *
	 * @param pair The pair to append to this list.
	 * @return This object (for method chaining).
	 */
	public NameValuePairs append(NameValuePair pair) {
		super.add(pair);
		return this;
	}

	/**
	 * Appends the specified name/value pair to the end of this list.
	 *
	 * <p>
	 * The value is simply converted to a string using <c>toString()</c>, or <js>"null"</js> if <jk>null</jk>.
	 *
	 * @param name The pair name.
	 * @param value The pair value.
	 * @return This object (for method chaining).
	 */
	public NameValuePairs append(String name, Object value) {
		super.add(new BasicNameValuePair(name, stringify(value)));
		return this;
	}

	/**
	 * Appends the specified name/value pair to the end of this list.
	 *
	 * <p>
	 * The value is converted to UON notation using the {@link UrlEncodingSerializer} defined on the client.
	 *
	 * @param name The pair name.
	 * @param value The pair value.
	 * @param serializer
	 * 	The serializer to use for serializing the value to a string value.
	 * @param schema
	 * 	The schema object that defines the format of the output.
	 * 	<br>If <jk>null</jk>, defaults to the schema defined on the parser.
	 * 	<br>If that's also <jk>null</jk>, defaults to {@link HttpPartSchema#DEFAULT}.
	 * 	<br>Only used if serializer is schema-aware (e.g. {@link OpenApiSerializer}).
	 * @return This object (for method chaining).
	 */
	public NameValuePairs append(String name, Object value, HttpPartSerializer serializer, HttpPartSchema schema) {
		super.add(new SerializedNameValuePair(name, value, serializer, schema));
		return this;
	}
}