/**
 * Copyright 2018-2023 ZTE Corporation.
 * <p>
 * Licensed 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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 org.onap.holmes.common.aai;

import com.google.gson.JsonArray;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import jakarta.ws.rs.client.Entity;
import org.onap.holmes.common.aai.config.AaiConfig;
import org.onap.holmes.common.config.MicroServiceConfig;
import org.onap.holmes.common.utils.JerseyClient;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.HashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class AaiQuery4Ccvpn {

    private final Logger log = LoggerFactory.getLogger(AaiQuery4Ccvpn.class);

    private Map<String, Object> headers;

    public static AaiQuery4Ccvpn newInstance() {
        return new AaiQuery4Ccvpn();
    }

    private static final String EMPTY_STR = "";

    private static final JsonObject EMPTY_JSON = new JsonObject();

    private AaiQuery4Ccvpn() {
        headers = new HashMap<>();
        headers.put("X-TransactionId", AaiConfig.X_TRANSACTION_ID);
        headers.put("X-FromAppId", AaiConfig.X_FROMAPP_ID);
        headers.put("Authorization", AaiConfig.getAuthenticationCredentials());
        headers.put("Accept", "application/json");
        headers.put("Content-Type", "application/json");
    }

    /**
     * Query the logic link information for AAI. This method is based on the API:
     * https://<AAI host>:<AAI port>/aai/v14/network/network-resources/network-resource/{networkId}/pnfs/pnf/{pnfName}/p-interfaces?interface-name={ifName}&operational-status={status}
     * provided by AAI.
     *
     * @param networkId
     * @param pnfName
     * @param ifName
     * @param status
     * @return the ID of the logic link
     */
    public String getLogicLink(String networkId, String pnfName, String ifName, String status) {
        Map<String, String> params = new HashMap<>();
        params.put("networkId", networkId);
        params.put("pnfName", pnfName);
        params.put("ifName", ifName);

        String response = get(getPath(AaiConfig.AaiConsts.AAI_LINK_QUERY, params)
                + (status == null ? "" : String.format("&operational-status=%s", status)));

        JsonObject linkInfo = getInfo(response, "p-interface", "logical-link");

        if (linkInfo == null) {
            log.warn(String.format("Link information is missing from AAI. Method: [getLogicLink], " +
                    "params: [networkId - %s, pnfName - %s, ifName - %s].", networkId, pnfName, ifName));
            return EMPTY_STR;
        }
        return extractValueFromJsonArray(linkInfo.get("relationship-data").getAsJsonArray(), "logical-link.link-name");
    }

    /**
     * Query the service instances related to a terminal point. This method is mainly based on the API:
     * https://<AAI host>:<AAI port>/aai/v14/network/connectivities?connectivity-id={connectivityId}
     * and
     * https://<AAI host>:<AAI port>/aai/v14/business/customers/customer/{global-customer-id}/service-subscriptions/service-subscription/{service-type}
     * provided by AAI. The path for getting the required instance information is: p-interface → vpn-vpnbinding → connectivity → service instance
     *
     * @param networkId
     * @param pnfName
     * @param ifName
     * @param status
     * @return service instances in JSONObject format
     */
    public JsonObject getServiceInstance(String networkId, String pnfName, String ifName, String status) {
        JsonObject vpnBindingInfo = getVpnBindingInfo(networkId, pnfName, ifName, status);
        if (vpnBindingInfo == null) {
            log.warn(String.format("VPN binding information is missing from AAI. " +
                    "Method: [getServiceInstance], params: [networkId - %s, pnfName - %s, " +
                    "ifName - %s, status - %s].", networkId, pnfName, ifName, status));
            return EMPTY_JSON;
        }
        String vpnBindingId = extractValueFromJsonArray(vpnBindingInfo.get("relationship-data").getAsJsonArray(),
                "vpn-binding.vpn-id");
        JsonObject connectivityInfo = getConnectivityInfo(vpnBindingId);
        if (connectivityInfo == null) {
            log.warn(String.format("Connectivity information is missing from AAI. " +
                    "Method: [getServiceInstance], params: [networkId - %s, pnfName - %s, " +
                    "ifName - %s, status - %s].", networkId, pnfName, ifName, status));
            return EMPTY_JSON;
        }
        String connectivityId = extractValueFromJsonArray(connectivityInfo.get("relationship-data").getAsJsonArray(),
                "connectivity.connectivity-id");
        JsonObject serviceInstanceInfo = getServiceInstanceByConn(connectivityId);
        if (serviceInstanceInfo == null) {
            log.warn(String.format("Service instance information is missing from AAI. " +
                    "Method: [getServiceInstance], params: [networkId - %s, pnfName - %s, " +
                    "ifName - %s, status - %s].", networkId, pnfName, ifName, status));
            return EMPTY_JSON;
        }
        String serviceInstancePath = serviceInstanceInfo.get("related-link").getAsString();

        String response = get(serviceInstancePath);
        JsonObject instance = JsonParser.parseString(response).getAsJsonObject();

        String[] params = new String[2];
        Pattern pattern = Pattern.compile("/aai/v\\d+/business/customers/customer/(.+)" +
                "/service-subscriptions/service-subscription/(.+)" +
                "/service-instances/service-instance/(.+)");
        Matcher matcher = pattern.matcher(serviceInstancePath);
        if (matcher.find()) {
            params[0] = matcher.group(1);
            params[1] = matcher.group(2);
        }
        instance.addProperty("globalSubscriberId", params[0]);
        instance.addProperty("serviceType", params[1]);
        return instance;
    }


    public void updateTerminalPointStatus(String networkId, String pnfName, String ifName,
                                          Map<String, Object> body) {
        Map<String, String> params = new HashMap<>();
        params.put("networkId", networkId);
        params.put("pnfName", pnfName);
        params.put("ifName", ifName);
        String r = get(getPath(AaiConfig.AaiConsts.AAI_TP_UPDATE, params));
        JsonObject jsonObject = JsonParser.parseString(r).getAsJsonObject();
        body.put("resource-version", jsonObject.get("resource-version").toString());

        put(getPath(AaiConfig.AaiConsts.AAI_TP_UPDATE, params), body);
    }


    public void updateLogicLinkStatus(String linkName, Map<String, Object> body) {
        String r = get(getPath(AaiConfig.AaiConsts.AAI_LINK_UPDATE, "linkName", linkName));
        JsonObject jsonObject = JsonParser.parseString(r).getAsJsonObject();
        body.put("resource-version", jsonObject.get("resource-version").toString());
        body.put("link-type", jsonObject.get("link-type").toString());
        put(getPath(AaiConfig.AaiConsts.AAI_LINK_UPDATE, "linkName", linkName), body);
    }

    private JsonObject getVpnBindingInfo(String networkId, String pnfName,
                                         String ifName, String status) {
        Map<String, String> params = new HashMap();
        params.put("networkId", networkId);
        params.put("pnfName", pnfName);
        params.put("ifName", ifName);
        params.put("status", status);
        String response = get(getPath(AaiConfig.AaiConsts.AAI_VPN_ADDR, params));
        return getInfo(response, "p-interface", "vpn-binding");
    }

    private JsonObject getConnectivityInfo(String vpnId) {
        String response = get(getPath(AaiConfig.AaiConsts.AAI_CONN_ADDR, "vpnId", vpnId));
        return getInfo(response, "vpn-binding", "connectivity");
    }

    private JsonObject getServiceInstanceByConn(String connectivityId) {
        String response = get(getPath(AaiConfig.AaiConsts.AAI_SERVICE_INSTANCE_ADDR_4_CCVPN,
                "connectivityId", connectivityId));
        return getInfo(response, "connectivity", "service-instance");
    }

    private String getPath(String urlTemplate, Map<String, String> pathParams) {
        String url = urlTemplate;
        for (Map.Entry<String, String> entry : pathParams.entrySet()) {
            url = url.replaceAll("\\{" + entry.getKey() + "\\}", entry.getValue());
        }
        return url;
    }

    private String getPath(String urlTemplate, String paramName, String paramValue) {
        return urlTemplate.replaceAll("\\{" + paramName + "\\}", paramValue);
    }

    private String getPath(String serviceInstancePath) {
        Pattern pattern = Pattern.compile("/aai/(v\\d+)/([A-Za-z0-9\\-]+[^/])(/*.*)");
        Matcher matcher = pattern.matcher(serviceInstancePath);
        String ret = "/api";
        if (matcher.find()) {
            ret += "/aai-" + matcher.group(2) + "/" + matcher.group(1) + matcher.group(3);
        }

        return ret;
    }

    private JsonObject getInfo(String response, String pField, String field) {
        JsonObject jObject = JsonParser.parseString(response).getAsJsonObject();
        JsonObject pInterface = extractJsonObject(jObject, pField);
        if (pInterface == null) {
            pInterface = jObject;
        }
        JsonObject relationshipList = extractJsonObject(pInterface, "relationship-list");
        JsonArray relationShip = extractJsonArray(relationshipList, "relationship");
        if (relationShip != null) {
            for (int i = 0; i < relationShip.size(); ++i) {
                final JsonObject object = relationShip.get(i).getAsJsonObject();
                if (object.get("related-to").getAsString().equals(field)) {
                    return object;
                }
            }
        }
        return null;
    }

    private JsonObject extractJsonObject(JsonObject obj, String key) {
        if (obj != null && key != null && obj.has(key)) {
            return obj.get(key).getAsJsonObject();
        }
        return null;
    }

    private JsonArray extractJsonArray(JsonObject obj, String key) {
        if (obj != null && key != null && obj.has(key)) {
            return obj.get(key).getAsJsonArray();
        }
        return null;
    }

    private String extractValueFromJsonArray(JsonArray relationshipData, String keyName) {
        if (relationshipData != null) {
            for (int i = 0; i < relationshipData.size(); ++i) {
                JsonObject item = relationshipData.get(i).getAsJsonObject();
                if (item.get("relationship-key").getAsString().equals(keyName)) {
                    return item.get("relationship-value").getAsString();
                }
            }
        }
        return null;
    }

    private String get(String path) {
        return JerseyClient.newInstance().path(path).headers(headers).get(MicroServiceConfig.getAaiAddr());
    }

    private String put(String path, Map<String, Object> body) {
        return JerseyClient.newInstance().path(path).headers(headers).put(MicroServiceConfig.getAaiAddr(), Entity.json(body));
    }
}