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/*
 * Copyright 2013 Gregory Graham.
 *
 * 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 nz.co.gregs.dbvolution;

import nz.co.gregs.dbvolution.databases.DBDatabase;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import nz.co.gregs.dbvolution.columns.StringColumn;
import nz.co.gregs.dbvolution.datatypes.DBBoolean;
import nz.co.gregs.dbvolution.datatypes.DBString;
import nz.co.gregs.dbvolution.datatypes.QueryableDatatype;
import nz.co.gregs.dbvolution.exceptions.UnableToInstantiateDBRowSubclassException;
import nz.co.gregs.dbvolution.expressions.BooleanExpression;
import nz.co.gregs.dbvolution.expressions.StringExpression;
import nz.co.gregs.dbvolution.internal.properties.PropertyWrapper;
import nz.co.gregs.dbvolution.internal.query.QueryDetails;
import nz.co.gregs.dbvolution.internal.query.QueryOptions;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Provides support for the abstract concept of validating migration rows from
 * one or more tables to another table.
 *
 *
 * Support DBvolution at
 * Patreon
 *
 * @author Gregory Graham
 * @param 
 */
public class DBValidation {

	private static final Log LOG = LogFactory.getLog(DBValidation.class);

	private static String PROCESSED_COLUMN = "Processed Column";

	private final DBQueryInsert sourceMigration;
	private final DBRow[] extraExamples;
	private final DBRow mapper;

	/**
	 * Creates a DBValidate action for the table.
	 *
	 * @param migration the mapping to migrate
	 * @param mapper
	 * @param examples
	 */
	public DBValidation(DBQueryInsert migration, DBRow mapper, DBRow... examples) {
		sourceMigration = migration;
		this.mapper = mapper;
		extraExamples = examples;
	}

	/**
	 * Perform the validation
	 *
	 * @param database
	 * Support DBvolution at
	 * Patreon
	 * @return the results of the validation
	 * @throws SQLException
	 */
	public Results validate(DBDatabase database) throws SQLException {

		QueryDetails details = sourceMigration.getQueryDetails();
		QueryOptions options = details.getOptions();
		List conditions = details.getAllConditions(database);
		List allQueryTables = details.getAllQueryTables();

		DBQuery dbQuery = database.getDBQuery()
				.setBlankQueryAllowed(options.isBlankQueryAllowed())
				.setCartesianJoinsAllowed(options.isCartesianJoinAllowed())
				.addExtraExamples(extraExamples);

		addAllTablesToValidationQuery(allQueryTables, dbQuery);
		addProcessingColumnToValidationQuery(conditions, dbQuery);

		addDataCheckingColumnsToValidationQuery(dbQuery);

		final List allRows = dbQuery.getAllRows();
		Results results = new Results(mapper, allRows);

		return results;
	}

	private void addDataCheckingColumnsToValidationQuery(DBQuery dbQuery) {
		List properties = mapper.getColumnPropertyWrappers();
		for (PropertyWrapper prop : properties) {
			QueryableDatatype qdt = prop.getPropertyWrapperDefinition().getQueryableDatatype(mapper);
			if (qdt instanceof DBString) {
				StringColumn column = mapper.column((DBString) qdt);
				dbQuery.addExpressionColumn(prop,
						column.isNullOrEmpty().ifThenElse(StringExpression.value("NO DATA"), StringExpression.value("success")).asExpressionColumn());
			}
		}
	}

	private void addProcessingColumnToValidationQuery(List conditions, DBQuery dbQuery) {
		final BooleanExpression criteria = BooleanExpression.allOf(conditions.toArray(new BooleanExpression[]{}));

		dbQuery.addExpressionColumn(PROCESSED_COLUMN, criteria.asExpressionColumn());
	}

	private void addAllTablesToValidationQuery(List allQueryTables, DBQuery dbQuery) throws UnableToInstantiateDBRowSubclassException {
		for (DBRow tab : allQueryTables) {
			dbQuery.addOptional(DBRow.getDBRow(tab.getClass()));
		}
	}

	/**
	 * Results produced by validating a migration.
	 *
	 */
	public static class Results extends ArrayList {

		/**
		 * Serial Version ID
		 */
		protected final static long serialVersionUID = 1L;

		private Results() {
			super();
		}

		private Results(DBRow mapper, List rows) {
			for (DBQueryRow row : rows) {
				this.add(new Result(mapper, row));
			}
		}
	}

	/**
	 * A validation result.
	 *
	 */
	public static class Result {

		/**
		 * Indicates whether or not the row will be processed during the migration.
		 *
		 * 
		 * Unprocessed rows will be validated, but not migrated.
		 */
		private Boolean willBeProcessed = false;

		private DBQueryRow row = null;
		private final Map map = new HashMap<>();

		private Result() {
		}

		private Result(DBRow mapper, DBQueryRow row) {
			this.row = row;
			final QueryableDatatype expressionColumnValue = row.getExpressionColumnValue(DBValidation.PROCESSED_COLUMN);
			if (expressionColumnValue != null && expressionColumnValue instanceof DBBoolean) {
				this.willBeProcessed = ((DBBoolean) expressionColumnValue).booleanValue();
			}

			List properties = mapper.getColumnPropertyWrappers();
			for (PropertyWrapper prop : properties) {
				QueryableDatatype propColumnValue = row.getExpressionColumnValue(prop);
				this.map.put(prop.javaName(), propColumnValue.stringValue());
			}
		}

		/**
		 * Return the validated row of the DBRow from these Results.
		 *
		 */
		 A getRow(A exemplar) {
			return row.get(exemplar);
		}

		/**
		 * All the details of the results
		 *
		 * Support DBvolution at
		 * Patreon
		 *
		 * @return the names of the mappings with the resulting status
		 */
		public Map getMap() {
			return new HashMap<>(this.map);
		}

		/**
		 * @return the willBeProcessed
		 */
		public Boolean getWillBeProcessed() {
			return willBeProcessed;
		}

		/**
		 * @param willBeProcessed the willBeProcessed to set
		 */
		public void setWillBeProcessed(Boolean willBeProcessed) {
			this.willBeProcessed = willBeProcessed;
		}
	}
}