package com.jeesite.modules.mes.util;

import com.alibaba.fastjson.JSONObject;
import com.jeesite.common.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.charset.StandardCharsets;

/**
 * U9C OAuth2 登录工具类
 */
public class U9cAuthUtil {

	private static final Logger log = LoggerFactory.getLogger(U9cAuthUtil.class);

	private static final String AUTH_URL = "http://10.0.10.11/u9c/webapi/OAuth2/AuthLogin"
			+ "?clientid=mes"
			+ "&clientsecret=4cb93d6876d0484a9e4d3549b80cf5a1"
			+ "&entCode=100"
			+ "&userCode=yonyou"
			+ "&orgCode=100";

	private static final String CREATE_RCV_URL = "http://10.0.10.11/u9c/webapi/CustLJRMESOpenAPI/CreateRCV";

	private U9cAuthUtil() {
	}

	/**
	 * 调用 U9C OAuth2 登录接口，获取 token
	 *
	 * @return 登录成功返回 token，失败返回 null
	 */
	public static String getToken() {
		JSONObject response = authLogin();
		if (response == null) {
			return null;
		}
		Boolean success = response.getBoolean("Success");
		if (success != null && success) {
			return response.getString("Data");
		}
		log.warn("U9C 登录失败: {}", response.getString("ResMsg"));
		return null;
	}

	/**
	 * 调用 CreateRCV 接口，自动获取 token 并写入请求头
	 *
	 * @param requestBody JSON 请求体
	 * @return 接口响应，失败返回 null
	 */
	public static JSONObject createRCV(String requestBody) {
		String token = getToken();
		if (StringUtils.isEmpty(token)) {
			log.warn("CreateRCV 请求失败: 无法获取 token");
			return null;
		}
		return postWithToken(CREATE_RCV_URL, requestBody, token);
	}

	/**
	 * 调用 CreateRCV 接口，自动获取 token 并写入请求头
	 *
	 * @param requestBody JSON 请求体
	 * @return 接口响应，失败返回 null
	 */
	public static JSONObject createRCV(JSONObject requestBody) {
		return createRCV(requestBody == null ? "{}" : requestBody.toJSONString());
	}

	/**
	 * 调用 U9C OAuth2 登录接口，返回完整响应
	 */
	public static JSONObject authLogin() {
		HttpURLConnection connection = null;
		try {
			URL url = new URL(AUTH_URL);
			connection = (HttpURLConnection) url.openConnection();
			connection.setRequestMethod("GET");
			connection.setConnectTimeout(10000);
			connection.setReadTimeout(10000);
			connection.setDoInput(true);
			connection.setUseCaches(false);

			int responseCode = connection.getResponseCode();
			if (responseCode != HttpURLConnection.HTTP_OK) {
				log.warn("U9C 登录请求失败, HTTP状态码: {}", responseCode);
				return null;
			}

			String body = readResponse(connection.getInputStream());
			return JSONObject.parseObject(body);
		} catch (Exception e) {
			log.error("U9C 登录请求异常", e);
			return null;
		} finally {
			if (connection != null) {
				connection.disconnect();
			}
		}
	}

	private static JSONObject postWithToken(String url, String requestBody, String token) {
		HttpURLConnection connection = null;
		try {
			connection = (HttpURLConnection) new URL(url).openConnection();
			connection.setRequestMethod("POST");
			connection.setConnectTimeout(10000);
			connection.setReadTimeout(30000);
			connection.setDoInput(true);
			connection.setDoOutput(true);
			connection.setUseCaches(false);
			connection.setRequestProperty("Content-Type", "application/json;charset=UTF-8");
			connection.setRequestProperty("token", token);

			byte[] bodyBytes = StringUtils.defaultString(requestBody).getBytes(StandardCharsets.UTF_8);
			try (OutputStream outputStream = connection.getOutputStream()) {
				outputStream.write(bodyBytes);
				outputStream.flush();
			}

			int responseCode = connection.getResponseCode();
			InputStream inputStream = responseCode == HttpURLConnection.HTTP_OK
					? connection.getInputStream()
					: connection.getErrorStream();
			if (inputStream == null) {
				log.warn("CreateRCV 请求失败, HTTP状态码: {}", responseCode);
				return null;
			}

			String body = readResponse(inputStream);
			if (responseCode != HttpURLConnection.HTTP_OK) {
				log.warn("CreateRCV 请求失败, HTTP状态码: {}, 响应: {}", responseCode, body);
				return null;
			}
			return JSONObject.parseObject(body);
		} catch (Exception e) {
			log.error("CreateRCV 请求异常", e);
			return null;
		} finally {
			if (connection != null) {
				connection.disconnect();
			}
		}
	}

	private static String readResponse(InputStream inputStream) throws Exception {
		StringBuilder result = new StringBuilder();
		try (BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, StandardCharsets.UTF_8))) {
			String line;
			while ((line = reader.readLine()) != null) {
				result.append(line);
			}
		}
		return result.toString();
	}

}