/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the "Elastic License
 * 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side
 * Public License v 1"; you may not use this file except in compliance with, at
 * your election, the "Elastic License 2.0", the "GNU Affero General Public
 * License v3.0 only", or the "Server Side Public License, v 1".
 */

package org.elasticsearch.rest.action.admin.cluster;

import org.elasticsearch.action.admin.cluster.node.capabilities.NodesCapabilitiesRequest;
import org.elasticsearch.client.internal.node.NodeClient;
import org.elasticsearch.common.Strings;
import org.elasticsearch.rest.BaseRestHandler;
import org.elasticsearch.rest.RestRequest;
import org.elasticsearch.rest.Scope;
import org.elasticsearch.rest.ServerlessScope;
import org.elasticsearch.rest.action.RestActions.NodesResponseRestListener;

import java.io.IOException;
import java.net.URLDecoder;
import java.nio.charset.StandardCharsets;
import java.util.List;
import java.util.Set;

import static org.elasticsearch.rest.RestUtils.getTimeout;

@ServerlessScope(Scope.INTERNAL)
public class RestNodesCapabilitiesAction extends BaseRestHandler {

    private static final Set<String> SUPPORTED_QUERY_PARAMETERS = Set.of(
        "timeout",
        "method",
        "path",
        "parameters",
        "capabilities",
        "local_only"
    );

    @Override
    public List<Route> routes() {
        return List.of(new Route(RestRequest.Method.GET, "/_capabilities"));
    }

    @Override
    public Set<String> supportedQueryParameters() {
        return SUPPORTED_QUERY_PARAMETERS;
    }

    @Override
    public String getName() {
        return "nodes_capabilities_action";
    }

    @Override
    protected RestChannelConsumer prepareRequest(RestRequest request, NodeClient client) throws IOException {
        NodesCapabilitiesRequest requestNodes = request.paramAsBoolean("local_only", false)
            ? new NodesCapabilitiesRequest(client.getLocalNodeId())
            : new NodesCapabilitiesRequest();

        // Handle the 'path' parameter, use "/" as default if not provided
        String path = URLDecoder.decode(request.param("path", "/"), StandardCharsets.UTF_8);

        requestNodes.setTimeout(getTimeout(request));
        NodesCapabilitiesRequest r = requestNodes.method(RestRequest.Method.valueOf(request.param("method", "GET")))
            .path(path)
            .parameters(request.paramAsStringArray("parameters", Strings.EMPTY_ARRAY))
            .capabilities(request.paramAsStringArray("capabilities", Strings.EMPTY_ARRAY));
        if (request.hasExplicitRestApiVersion()) {
            r.restApiVersion(request.getRestApiVersion());
        }

        return channel -> client.admin().cluster().nodesCapabilities(r, new NodesResponseRestListener<>(channel));
    }

    @Override
    public boolean canTripCircuitBreaker() {
        return false;
    }
}