/* Copyright (C) 2013 by Bundesamt fuer Strahlenschutz
 * Software engineering by Intevation GmbH
 *
 * This file is Free Software under the GNU GPL (v>=3)
 * and comes with ABSOLUTELY NO WARRANTY! Check out
 * the documentation coming with IMIS-Labordaten-Application for details.
 */
package de.intevation.lada.rest;

import java.util.List;
import java.util.Map;

import javax.enterprise.context.RequestScoped;
import javax.inject.Inject;
import javax.servlet.http.HttpServletRequest;
import javax.ws.rs.DELETE;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.PUT;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.core.UriInfo;

import de.intevation.lada.factory.ProbeFactory;
import de.intevation.lada.model.land.Messprogramm;
import de.intevation.lada.query.QueryTools;
import de.intevation.lada.util.annotation.AuthorizationConfig;
import de.intevation.lada.util.annotation.RepositoryConfig;
import de.intevation.lada.util.auth.Authorization;
import de.intevation.lada.util.auth.AuthorizationType;
import de.intevation.lada.util.data.Repository;
import de.intevation.lada.util.data.RepositoryType;
import de.intevation.lada.util.rest.RequestMethod;
import de.intevation.lada.util.rest.Response;
import de.intevation.lada.validation.Validator;
import de.intevation.lada.validation.Violation;
import de.intevation.lada.validation.annotation.ValidationConfig;

/**
 * REST service for Messprogramm objects.
 * <p>
 * The services produce data in the application/json media type.
 * All HTTP methods use the authorization module to determine if the user is
 * allowed to perform the requested action.
 * A typical response holds information about the action performed and the data.
 * <pre>
 * <code>
 * {
 *  "success": [boolean];
 *  "message": [string],
 *  "data":[{
 *      "id": [number],
 *      "baId": [string],
 *      "datenbasisId": [number],
 *      "gemId": [string],
 *      "gueltigBis": [date],
 *      "gueltigVon": [date],
 *      "intervallOffset": [number],
 *      "letzteAenderung": [timestamp],
 *      "mediaDesk": [string],
 *      "mstId": [string],
 *      "name": [string],
 *      "netzbetreiberId": [string],
 *      "ortId": [string],
 *      "probeKommentar": [string],
 *      "probeNehmerId": [number],
 *      "probenartId": [number],
 *      "probenintervall": [string],
 *      "teilintervallBis": [number],
 *      "teilintervallVon": [number],
 *      "test": [boolean],
 *      "umwId": [string]
 *  }],
 *  "errors": [object],
 *  "warnings": [object],
 *  "readonly": [boolean],
 *  "totalCount": [number]
 * }
 * </code>
 * </pre>
 *
 * @author <a href="mailto:rrenkert@intevation.de">Raimund Renkert</a>
 */
@Path("rest/messprogramm")
@RequestScoped
public class MessprogrammService {

    /**
     * The data repository granting read/write access.
     */
    @Inject
    @RepositoryConfig(type=RepositoryType.RW)
    private Repository defaultRepo;

    /**
     * The authorization module.
     */
    @Inject
    @AuthorizationConfig(type=AuthorizationType.HEADER)
    private Authorization authorization;

    /**
     * The validator used for Messprogramm objects.
     */
    @Inject
    @ValidationConfig(type="Messprogramm")
    private Validator validator;

    @Inject
    private ProbeFactory factory;

    @Inject
    private QueryTools queryTools;

    /**
     * Get all Messprogramm objects.
     * <p>
     * The requested objects can be filtered using the following URL
     * parameters:<br>
     *  * qid: The id of the query.<br>
     *  * page: The page to display in a paginated result grid.<br>
     *  * start: The first Probe item.<br>
     *  * limit: The count of Probe items.<br>
     *  * sort: Sort the result ascending(ASC) or descenting (DESC).<br>
     *  <br>
     *  The response data contains a stripped set of Messprogramm objects. The returned fields
     *  are defined in the query used in the request.
     * <p>
     * Example:
     * http://example.com/messprogramm?qid=[ID]&page=[PAGE]&start=[START]&limit=[LIMIT]&sort=[{"property":"messprogrammId","direction":"ASC"}]
     *
     * @return Response object containing all Messprogramm objects.
     */
    @GET
    @Path("/")
    @Produces(MediaType.APPLICATION_JSON)
    public Response get(
        @Context UriInfo info,
        @Context HttpServletRequest request
    ) {
        MultivaluedMap<String, String> params = info.getQueryParameters();
        if (params.isEmpty() || !params.containsKey("qid")) {
            return defaultRepo.getAll(Messprogramm.class, "land");
        }
        Integer id = null;
        try {
            id = Integer.valueOf(params.getFirst("qid"));
        }
        catch (NumberFormatException e) {
            return new Response(false, 603, "Not a valid filter id");
        }

        List<Map<String, Object>> result =
            queryTools.getResultForQuery(params, id, "messprogramm");

        int size = result.size();
        if (params.containsKey("start") && params.containsKey("limit")) {
            int start = Integer.valueOf(params.getFirst("start"));
            int limit = Integer.valueOf(params.getFirst("limit"));
            int end = limit + start;
            if (start + limit > result.size()) {
                end = result.size();
            }
            result = result.subList(start, end);
        }
        return new Response(true, 200, result, size);
    }

    /**
     * Get a Messprogramm object by id.
     * <p>
     * The id is appended to the URL as a path parameter.
     * <p>
     * Example: http://example.com/messprogramm/{id}
     *
     * @return Response object containing a single Messprogramm.
     */
    @GET
    @Path("/{id}")
    @Produces(MediaType.APPLICATION_JSON)
    public Response getById(
        @Context HttpServletRequest request,
        @PathParam("id") String id
    ) {
        return authorization.filter(
            request,
            defaultRepo.getById(Messprogramm.class, Integer.valueOf(id), "land"),
            Messprogramm.class);
    }

    /**
     * Create a Messprogramm object.
     * <p>
     * The new object is embedded in the post data as JSON formatted string.
     * <p>
     * <pre>
     * <code>
     * {
     *  "test": [boolean],
     *  "netzbetreiberId": [string],
     *  "mstId": [string],
     *  "name": [string],
     *  "datenbasisId": [number],
     *  "baId": [string],
     *  "gemId": [string],
     *  "ortId": [string],
     *  "mediaDesk": [string],
     *  "umwId": [string],
     *  "probenartId": [number],
     *  "probenintervall": [string],
     *  "teilintervallVon": [number],
     *  "teilintervallBis": [number],
     *  "intervallOffset": [string],
     *  "probeNehmerId": [number],
     *  "probeKommentar": [string],
     *  "letzteAenderung": [date]
     * }
     * </code>
     * </pre>
     *
     * @return A response object containing the created Messprogramm.
     */
    @POST
    @Path("/")
    @Produces(MediaType.APPLICATION_JSON)
    public Response create(
        @Context HttpServletRequest request,
        Messprogramm messprogramm
    ) {
        if (!authorization.isAuthorized(
                request,
                messprogramm,
                RequestMethod.POST,
                Messprogramm.class)
        ) {
            return new Response(false, 699, null);
        }

        Violation violation = validator.validate(messprogramm);
        if (violation.hasErrors()) {
            Response response = new Response(false, 604, messprogramm);
            response.setErrors(violation.getErrors());
            response.setWarnings(violation.getWarnings());
            return response;
        }

        if (messprogramm.getUmwId() == null || messprogramm.getUmwId().length() == 0) {
            messprogramm = factory.findUmweltId(messprogramm);
        }
        /* Persist the new messprogramm object*/
        Response response = defaultRepo.create(messprogramm, "land");
        Messprogramm ret = (Messprogramm)response.getData();
        Response created =
            defaultRepo.getById(Messprogramm.class, ret.getId(), "land");
        return authorization.filter(
            request,
            new Response(true, 200, created.getData()),
            Messprogramm.class);
    }

    /**
     * Update an existing Messprogramm object.
     * <p>
     * The object to update should come as JSON formatted string.
     * <pre>
     * <code>
     * {
     *  "id": [number],
     *  "test": [boolean],
     *  "netzbetreiberId": [string],
     *  "mstId": [string],
     *  "name": [string],
     *  "datenbasisId": [number],
     *  "baId": [string],
     *  "gemId": [string],
     *  "ortId": [string],
     *  "mediaDesk": [string],
     *  "umwId": [string],
     *  "probenartId": [number],
     *  "probenintervall": [string],
     *  "teilintervallVon": [number],
     *  "teilintervallBis": [number],
     *  "intervallOffset": [string],
     *  "probeNehmerId": [number],
     *  "probeKommentar": [string],
     *  "letzteAenderung": [date]
     * }
     * </code>
     * </pre>
     *
     * @return Response object containing the updated Messprogramm object.
     */
    @PUT
    @Path("/{id}")
    @Produces(MediaType.APPLICATION_JSON)
    public Response update(
        @Context HttpServletRequest request,
        @PathParam("id") String id,
        Messprogramm messprogramm
    ) {
        if (!authorization.isAuthorized(
                request,
                messprogramm,
                RequestMethod.PUT,
                Messprogramm.class)
        ) {
            return new Response(false, 699, null);
        }

        Violation violation = validator.validate(messprogramm);
        if (violation.hasErrors()) {
            Response response = new Response(false, 604, messprogramm);
            response.setErrors(violation.getErrors());
            response.setWarnings(violation.getWarnings());
            return response;
        }

        if (messprogramm.getUmwId() == null || messprogramm.getUmwId().equals("")) {
            messprogramm = factory.findUmweltId(messprogramm);
        }
        Response response = defaultRepo.update(messprogramm, "land");
        if (!response.getSuccess()) {
            return response;
        }
        Response updated = defaultRepo.getById(
            Messprogramm.class,
            ((Messprogramm)response.getData()).getId(), "land");
        return authorization.filter(
            request,
            updated,
            Messprogramm.class);
    }

    /**
     * Delete an existing Messprogramm object by id.
     * <p>
     * The id is appended to the URL as a path parameter.
     * <p>
     * Example: http://example.com/messprogamm/{id}
     *
     * @return Response object.
     */
    @DELETE
    @Path("/{id}")
    @Produces(MediaType.APPLICATION_JSON)
    public Response delete(
        @Context HttpServletRequest request,
        @PathParam("id") String id
    ) {
        /* Get the messung object by id*/
        Response messprogramm =
            defaultRepo.getById(Messprogramm.class, Integer.valueOf(id), "land");
        Messprogramm messprogrammObj = (Messprogramm)messprogramm.getData();
        if (!authorization.isAuthorized(
                request,
                messprogrammObj,
                RequestMethod.DELETE,
                Messprogramm.class)
        ) {
            return new Response(false, 699, null);
        }
        /* Delete the messprogramm object*/
        Response response = defaultRepo.delete(messprogrammObj, "land");
        return response;
    }
}