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package com.bagri.server.hazelcast.management;

import static com.bagri.core.server.api.CacheConstants.*;
import static com.bagri.support.util.XQUtils.getTypeName;

import java.util.Arrays;
import java.util.Collection;
import java.util.Set;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;

import javax.management.openmbean.TabularData;

import org.springframework.jmx.export.annotation.ManagedAttribute;
import org.springframework.jmx.export.annotation.ManagedOperation;
import org.springframework.jmx.export.annotation.ManagedOperationParameter;
import org.springframework.jmx.export.annotation.ManagedOperationParameters;
import org.springframework.jmx.export.annotation.ManagedResource;

import com.bagri.core.DataKey;
import com.bagri.core.model.Elements;
import com.bagri.core.model.Path;
import com.bagri.core.system.Fragment;
import com.bagri.core.system.Schema;
import com.bagri.server.hazelcast.predicate.GroupCountPredicate;
import com.bagri.server.hazelcast.task.model.ModelRegistrator;
import com.hazelcast.core.IMap;
import com.hazelcast.query.Predicate;
import com.hazelcast.query.Predicates;

@ManagedResource(description="Model Management MBean")
public class ModelManagement extends SchemaFeatureManagement {

    public ModelManagement(String schemaName) {
    	super(schemaName);
    }

	@Override
	protected String getFeatureKind() {
		return "ModelManagement";
	}
	
	@Override
	protected Collection getSchemaFeatures(Schema schema) {
		return schema.getFragments();
	}

	//@ManagedAttribute(description="Return Document Types registered in the Schema")
	// TODO: collect unique document roots
	//public String[] getDocumentTypes() {
	//  IMap dtCache = hzClient.getMap(CN_XDM_DOCTYPE_DICT);
	//	Collection types = dtCache.values();
	//	String[] result = new String[types.size()];
	//	int idx = 0;
	//	for (DocumentType type: types) {
	//		result[idx++] = "" + type.getTypeId() + ": " + type.getRootPath();
	//	}
	//	Arrays.sort(result);
	//	return result;
	//}

	@ManagedAttribute(description="Return Fragments registered in the Schema")
	public TabularData getFragments() {
		return getTabularFeatures("fragment", "Fragment definition", "name");
	}
	
	@ManagedOperation(description="Adds a new Document Fragment")
	@ManagedOperationParameters({
		@ManagedOperationParameter(name = "name", description = "Fragment name to create"),
		@ManagedOperationParameter(name = "docType", description = "Root path for document type"),
		@ManagedOperationParameter(name = "path", description = "XPath to Fragment"),
		@ManagedOperationParameter(name = "description", description = "Fragment description")})
	public void addFragment(String name, String docType, String path, String description) {

		logger.trace("addFragment.enter;");
		long stamp = System.currentTimeMillis();
		Fragment fragment = schemaManager.addFragment(name, docType, path, description);
		if (fragment == null) {
			throw new IllegalStateException("Fragment '" + name + "' in schema '" + schemaName + "' already exists");
		}
		
		int cnt = 0;
		stamp = System.currentTimeMillis() - stamp;
		logger.trace("addFragment.exit; fragment added on {} members; timeTaken: {}", cnt, stamp);
	}
	
	@ManagedOperation(description="Removes an existing Fragment")
	@ManagedOperationParameters({@ManagedOperationParameter(name = "name", description = "Fragment name to remove")})
	public void removeFragment(String name) {
		
		logger.trace("removeFragment.enter;");
		long stamp = System.currentTimeMillis();
		if (!schemaManager.deleteFragment(name)) {
			throw new IllegalStateException("Fragment '" + name + "' in schema '" + schemaName + "' does not exist");
		}

		int cnt = 0;
		stamp = System.currentTimeMillis() - stamp;
		logger.trace("removeFragment.exit; fragment deleted on {} members; timeTaken: {}", cnt, stamp);
	}

	@ManagedOperation(description="Enables/Disables an existing Fragment")
	@ManagedOperationParameters({
		@ManagedOperationParameter(name = "name", description = "Fragment name to enable/disable"),
		@ManagedOperationParameter(name = "enable", description = "enable/disable fragment")})
	public void enableFragment(String name, boolean enable) {
		
		if (!schemaManager.enableFragment(name, enable)) {
			throw new IllegalStateException("Fragment '" + name + "' in schema '" + schemaName + 
					"' does not exist or already " + (enable ? "enabled" : "disabled"));
		}
	}
	
	@ManagedOperation(description="Return all unique paths for the document type provided")
	@ManagedOperationParameters({
		@ManagedOperationParameter(name = "root", description = "A document type root")})
	public String[] getPathsForRoot(String root) {
	    IMap xpCache = hzClient.getMap(CN_XDM_PATH_DICT);
		Collection paths = xpCache.values(Predicates.equal("root", root)); 
		logger.debug("getPathsForRoot; got paths {} for root {}", paths, root);
		String[] result = new String[paths.size()];
		int idx = 0;
		for (Path path: paths) {
			result[idx++] = "" + path.getPathId() + ": " + path.getPath() + 
					" (" + path.getNodeKind() + ":" + getTypeName(path.getDataType()) + ")";
		}
		return result;
	}
	
	@ManagedAttribute(description="Return candidate index usage statistics, per query path")
	public TabularData getPathStatistics() {
		return null;
	}
	
	@ManagedOperation(description="Register Model")
	@ManagedOperationParameters({
		@ManagedOperationParameter(name = "dataFormat", description = "DataFormat responsible for corresponding Schema"),
		@ManagedOperationParameter(name = "modelFile", description = "A full path to Schema file to register")})
	public int registerModel(String dataFormat, String modelFile) {
		logger.trace("registerModel.enter;");
		long stamp = System.currentTimeMillis();
		ModelRegistrator task = new ModelRegistrator(dataFormat, modelFile, true);
		Future result = execService.submit(task);
		int cnt = 0;
		try {
			cnt = result.get();
		} catch (InterruptedException | ExecutionException ex) {
			logger.error("", ex);
		}
		stamp = System.currentTimeMillis() - stamp;
		logger.trace("registerModel.exit; returning: {}; timeTaken: {}", cnt, stamp);
		return cnt;
	}
	
	@ManagedOperation(description="Register Schemas")
	@ManagedOperationParameters({
		@ManagedOperationParameter(name = "dataFormat", description = "DataFormat responsible for corresponding Schema"),
		@ManagedOperationParameter(name = "schemaCatalog", description = "A full path to the directory containing Schema files to register")})
	public int registerModels(String dataFormat, String modelCatalog) {
		logger.trace("registerModels.enter;");
		long stamp = System.currentTimeMillis();
		ModelRegistrator task = new ModelRegistrator(dataFormat, modelCatalog, false);
		Future result = execService.submit(task);
		int cnt = 0;
		try {
			cnt = result.get();
		} catch (InterruptedException | ExecutionException ex) {
			logger.error("", ex);
		}
		stamp = System.currentTimeMillis() - stamp;
		logger.trace("registerModels.exit; returning: {}; timeTaken: {}", cnt, stamp);
		return cnt;
	}
	
	@ManagedOperation(description="Calculates the number of unique values on the path specified")
	@ManagedOperationParameters({
		@ManagedOperationParameter(name = "pathId", description = "The path identifier to aggregate on")})
	public int aggregatePath(int pathId) {

		IMap elts = hzClient.getMap(CN_XDM_ELEMENT);
		Predicate q = Predicates.equal("pathId", pathId);
		Set keys = elts.keySet(q);
		if (keys.size() > 0) {
			q = Predicates.and(Predicates.equal("pathId", pathId), new GroupCountPredicate());
			elts.keySet(q);
		}
		return keys.size();
	}
	
}