/*-
 * ========================LICENSE_START=================================
 * restheart-mongodb
 * %%
 * Copyright (C) 2014 - 2020 SoftInstigate
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 * =========================LICENSE_END==================================
 */
package org.restheart.mongodb.handlers.document;

import io.undertow.server.HttpServerExchange;
import io.undertow.util.Headers;
import org.bson.BsonDocument;
import org.bson.BsonValue;
import org.restheart.exchange.MongoRequest;
import org.restheart.exchange.MongoResponse;
import org.restheart.exchange.OperationResult;
import org.restheart.handlers.PipelinedHandler;
import org.restheart.mongodb.db.DocumentDAO;
import org.restheart.mongodb.utils.ResponseHelper;
import org.restheart.utils.HttpStatus;

/**
 *
 * @author Andrea Di Cesare {@literal <andrea@softinstigate.com>}
 */
public class PutDocumentHandler extends PipelinedHandler {
    private final DocumentDAO documentDAO;

    /**
     * Default ctor
     */
    public PutDocumentHandler() {
        this(null, new DocumentDAO());
    }

    /**
     * Default ctor
     *
     * @param next
     */
    public PutDocumentHandler(PipelinedHandler next) {
        this(next, new DocumentDAO());
    }

    /**
     * Creates a new instance of PutDocumentHandler
     *
     * @param next
     * @param documentDAO
     */
    public PutDocumentHandler(PipelinedHandler next, DocumentDAO documentDAO) {
        super(next);
        this.documentDAO = documentDAO;
    }

    /**
     *
     * @param exchange
     * @throws Exception
     */
    @Override
    public void handleRequest(HttpServerExchange exchange) throws Exception {
        var request = MongoRequest.of(exchange);
        var response = MongoResponse.of(exchange);
        
        if (request.isInError()) {
            next(exchange);
            return;
        }
        
        BsonValue _content = request.getContent();

        if (_content == null) {
            _content = new BsonDocument();
        }

        // cannot PUT an array
        if (!_content.isDocument()) {
            response.setInError(
                    HttpStatus.SC_NOT_ACCEPTABLE,
                    "data must be a josn object");
            next(exchange);
            return;
        }

        BsonDocument content = _content.asDocument();

        BsonValue id = request.getDocumentId();

        if (content.get("_id") == null) {
            content.put("_id", id);
        } else if (!content.get("_id").equals(id)) {
            response.setInError(
                    HttpStatus.SC_NOT_ACCEPTABLE,
                    "_id in content body is different than id in URL");
            next(exchange);
            return;
        }

        String etag = request.getETag();

        OperationResult result = this.documentDAO.upsertDocument(
                request.getClientSession(),
                request.getDBName(),
                request.getCollectionName(),
                request.getDocumentId(),
                request.getFiltersDocument(),
                request.getShardKey(),
                content,
                etag,
                false,
                request.isETagCheckRequired());

        response.setDbOperationResult(result);

        // inject the etag
        if (result.getEtag() != null) {
            ResponseHelper.injectEtagHeader(exchange, result.getEtag());
        }
        
        if (result.getHttpCode() == HttpStatus.SC_CONFLICT) {
            response.setInError(
                    HttpStatus.SC_CONFLICT,
                    "The document's ETag must be provided using the '"
                    + Headers.IF_MATCH
                    + "' header");
            next(exchange);
            return;
        }
        
        // handle the case of duplicate key error
        if (result.getHttpCode() == HttpStatus.SC_EXPECTATION_FAILED) {
            response.setInError(
                    HttpStatus.SC_EXPECTATION_FAILED,
                    ResponseHelper.getMessageFromErrorCode(11000));
            next(exchange);
            return;
        }
        
        response.setStatusCode(result.getHttpCode());

        next(exchange);
    }
}