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/*
 * Copyright 2011-2015 the original author or authors.
 *
 * 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
 *
 * 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 org.glowroot.ui;

import org.immutables.value.Value;
import org.glowroot.agent.shaded.slf4j.Logger;
import org.glowroot.agent.shaded.slf4j.LoggerFactory;

@JsonService
class TraceJsonService {

    private static final Logger logger = LoggerFactory.getLogger(TraceJsonService.class);

    private final TraceCommonService traceCommonService;

    TraceJsonService(TraceCommonService traceCommonService) {
        this.traceCommonService = traceCommonService;
    }

    @GET("/backend/trace/header")
    String getHeader(String queryString) throws Exception {
        HeaderRequest request = QueryStrings.decode(queryString, HeaderRequest.class);
        String headerJson = traceCommonService.getHeaderJson(request.serverId(), request.traceId());
        if (headerJson == null) {
            logger.debug("no trace found for server id '{}' and trace id '{}'", request.serverId(),
                    request.traceId());
            return "{\"expired\":true}";
        } else {
            return headerJson;
        }
    }

    @Value.Immutable
    interface HeaderRequest {
        String serverId();
        String traceId();
    }
}