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package m.watershed.d8flowdir;

import csip.Config;
import csip.api.server.Executable;
import csip.ModelDataService;
import csip.api.server.ServiceException;
import csip.annotations.Resource;
import javax.ws.rs.Path;
import csip.annotations.Description;
import csip.annotations.Name;
import java.io.*;
import java.util.logging.Level;
import m.watershed.Resources;
import static m.watershed.Resources.D8;
import static m.watershed.Resources.GDAL;
import static m.watershed.Resources.MPI;

/**
 * flow direction
 *
 * @author @author HK (using JK's template (using OD's template))
 */
@Name("d8flowdir")
@Description("Example of eight flow direction")
@Path("m/d8flowdir/2.0")
@Resource(from = Resources.class)
public class V2_0 extends ModelDataService {

    static final String KEY_FILL_DEM = "dem_fill";

    int act_cores = Runtime.getRuntime().availableProcessors() / 2;
    int threads = act_cores + (act_cores / 2);

    @Override
    protected void doProcess() throws Exception {

        LOG.info("===>  Processing ");

        if (attachments().hasFile(parameter().getString(KEY_FILL_DEM))) {

            threads = Config.getInt("mpi.cores", threads);
            threads = parameter().getInt("mpi.cores", threads);

            LOG.info("===>  filled DEM is attached ");

            String file_string = parameter().getString("dem_fill");
            File file_obj = attachments().getFile(file_string);

            String DEM_fill_path = file_obj.getPath();
            String wd = workspace().getDir().toString();

            Executable ee = resources().getExe(MPI);
            File e2 = resources().getFile(D8);

            if (LOG.isLoggable(Level.INFO)) {
                LOG.info(" #Cores : " + threads);
                LOG.info(" e2_path: " + e2.getPath());
            }

            ee.addArguments("--allow-run-as-root",
                    "--path", e2.getParent(),
                    "-wdir", workspace().getDir(),
                    "--oversubscribe",
                    "-np", threads,
                    e2.getName(),
                    "-fel", DEM_fill_path,
                    "-sd8", workspace().getFile("slope_d8_pre.tif"),
                    "-p", workspace().getFile("flow_direction_d8_pre.tif")
            );

            StringWriter err = new StringWriter();
            StringWriter output = new StringWriter();
            ee.redirectError(err);
            ee.redirectOutput(output);
            ee.redirectDefaults();

            int retee = ee.exec();

            if (LOG.isLoggable(Level.INFO)) {
                LOG.info(output.toString());
            }
            if (LOG.isLoggable(Level.SEVERE)) {
                LOG.severe(err.toString());
            }

            if (retee != 0) {
                throw new ServiceException("D8 Error : " + err.toString());
            }

            err = new StringWriter();
            output = new StringWriter();

            Executable eg1 = resources().getExe(GDAL);
            eg1.addArguments("-overwrite",
                    "-multi",
                    "-co", "NUM_THREADS=" + threads + "",
                    "-wo", "NUM_THREADS=" + threads + "",
                    "--config",
                    "GDAL_CACHEMAX", "2000",
                    "-wm", "2000",
                    "-of", "GTiff",
                    "-co", "TILED=YES",
                    "-co", "COMPRESS=LZW",
                    "-co", "BIGTIFF=YES",
                    "-dstnodata", "-9999",
                    workspace().getFile("slope_d8_pre.tif"),
                    workspace().getFile("slope_d8.tif")
            );

            eg1.redirectError(err);
            eg1.redirectOutput(output);
            eg1.redirectDefaults();

            if (LOG.isLoggable(Level.INFO)) {
                LOG.info(output.toString());
            }
            if (LOG.isLoggable(Level.SEVERE)) {
                LOG.severe(err.toString());
            }

            retee = eg1.exec();

            if (retee != 0) {
                throw new ServiceException("Error D8 GDAL slope : " + err);
            }

            err = new StringWriter();
            output = new StringWriter();

            Executable eg2 = resources().getExe("gdalwarp");

            eg2.addArguments("-overwrite",
                    "-ot", "Int16",
                    "-multi",
                    "-co", "NUM_THREADS=" + threads + "",
                    "-wo", "NUM_THREADS=" + threads + "",
                    "--config",
                    "GDAL_CACHEMAX", "2000",
                    "-wm", "2000",
                    "-of", "GTiff",
                    "-co", "TILED=YES",
                    "-co", "COMPRESS=LZW",
                    "-co", "BIGTIFF=YES",
                    "-dstnodata", "-9999",
                    workspace().getFile("flow_direction_d8_pre.tif"),
                    workspace().getFile("flow_direction_d8.tif")
            );

            eg2.redirectError(err);
            eg2.redirectOutput(output);
            eg2.redirectDefaults();

            if (LOG.isLoggable(Level.INFO)) {
                LOG.info(output.toString());
            }
            if (LOG.isLoggable(Level.SEVERE)) {
                LOG.severe(err.toString());
            }

            retee = eg2.exec();

            if (retee != 0) {
                throw new ServiceException("Error D8 GDAL flow direction : " + err);
            }

        } else {
            throw new ServiceException("No Filled DEM listet!");
        }
    }

    @Override
    protected void postProcess() throws Exception {
        File ws = workspace().getDir();
        results().put(workspace().getFile("slope_d8.tif"), "slope raster");
        results().put(workspace().getFile("flow_direction_d8.tif"), "flow direction raster");
    }
}