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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.rest4j.impl;

import com.rest4j.ApiException;
import com.rest4j.ApiRequest;
import com.rest4j.json.JSONArray;
import com.rest4j.json.JSONException;
import com.rest4j.json.JSONObject;
import org.apache.commons.io.IOUtils;

import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.util.Collections;
import java.util.regex.Pattern;

/**
 * @author Joseph Kapizza 
 */
public class ApiRequestServletImpl extends ApiRequest {
	private final HttpServletRequest request;
	JSONObject objectInput;
	JSONArray arrayInput;

	public ApiRequestServletImpl(HttpServletRequest request) {
		this.request = request;
	}

	@Override
	public String method() {
		return request.getMethod();
	}

	@Override
	public String path() {
		return request.getRequestURI();
	}

	@Override
	public String param(String name) {
		return request.getParameter(name);
	}

	@Override
	public Iterable paramNames() {
		return Collections.list(request.getParameterNames());
	}

	@Override
	public String header(String name) {
		return request.getHeader(name);
	}

	@Override
	public JSONObject objectInput() throws IOException, ApiException {
		if (objectInput != null) return objectInput;
		checkJSON();
		String json = getString();
		try {
			return objectInput = new JSONObject(json);
		} catch (JSONException e) {
			throw new ApiException("Wrong JSON format: "+e.getMessage());
		}
	}

	@Override
	public JSONArray arrayInput() throws IOException, ApiException {
		if (arrayInput != null) return arrayInput;
		checkJSON();
		String json = getString();
		try {
			return arrayInput = new JSONArray(json);
		} catch (JSONException e) {
			throw new ApiException("Wrong JSON format: "+e.getMessage());
		}
	}

	private String getString() throws IOException {
		String json = IOUtils.toString(request.getReader());
		if (json.startsWith("\ufeff")) { // UTF-8 prefix
			json = json.substring(1);
		}
		return json;
	}

	@Override
	public InputStream binaryInput() throws IOException, ApiException {
		return request.getInputStream();
	}

	@Override
	public Reader textInput() throws IOException, ApiException {
		return request.getReader();
	}

	@Override
	public boolean https() {
		return request.isSecure();
	}

	static final Pattern JSON_CONTENT_TYPE =  Pattern.compile("(application/json|text/json)( *;.*)?");

	void checkJSON() throws ApiException {
		String contentType = request.getContentType();
		if (contentType != null && !JSON_CONTENT_TYPE.matcher(contentType).matches()) {
			throw new ApiException("Unsupported content-type: expected either application/json or text/json").setHttpStatus(415);
		}
	}

}