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/*
 * Copyright (C) 2014 The droitated DB Authors
 *
 * 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 org.droitateddb.builder.schema.writer;

import org.droitateddb.builder.schema.data.Association;
import org.droitateddb.builder.schema.data.Column;
import org.droitateddb.builder.schema.data.Table;
import org.droitateddb.schema.AssociationType;
import org.droitateddb.schema.SchemaConstants;

import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedList;
import java.util.List;
import java.util.Locale;

import static org.droitateddb.builder.Constants.CONSTANT_ATTRIBUTE_ARRAY;
import static org.droitateddb.builder.Constants.CONSTANT_STRING;
import static org.droitateddb.builder.Constants.CONSTANT_STRING_ARRAY;
import static org.droitateddb.builder.Constants.TAB;
import static java.lang.String.format;

/**
 * @author Alexander Frank
 * @author Falk Appel
 */
public class TableWriter implements Writer {

	private final String indent;
	private final Table  table;

	public TableWriter(final String indent, final Table table) {
		this.indent = indent;
		this.table = table;
	}

	@Override
	public String write() {
		StringBuilder builder = new StringBuilder(indent);
		List columnNames = new LinkedList();
		List toOneAssociationNames = new LinkedList();
		List columnSql = new LinkedList();

		addDeclaration(builder);
		addTableData(builder);
		addColumns(builder, columnSql, columnNames, toOneAssociationNames);
		addSqlStatement(builder, columnSql);
		addProjection(builder, columnNames, toOneAssociationNames);
		addAttributes(builder, columnNames);
		addAssociations(builder);
		addEnd(builder);

		return builder.toString();
	}

	private void addDeclaration(final StringBuilder builder) {
		builder.append("public interface ").append(table.getName()).append(SchemaConstants.TABLE).append(" {\n");
	}

	private void addTableData(final StringBuilder builder) {
		builder.append(indent).append(TAB).append(format(CONSTANT_STRING, SchemaConstants.CLASS_NAME, table.getEntityClassName()));
		builder.append(indent).append(TAB).append(format(CONSTANT_STRING, SchemaConstants.TABLE_NAME, table.getName()));
		builder.append("\n");
	}

	private void addColumns(final StringBuilder builder, final List columnSql, final List columnNames,
							final List toOneAssociationNames) {
		int columnIdx = 0;
		for (Column column : table.getColumns()) {
			ColumnWriter columnWriter = new ColumnWriter(TAB, column, columnIdx++);
			builder.append(columnWriter.write());
			columnSql.add(columnWriter.getSql());
			columnNames.add(column.getNameInEntity());
		}
		for (Association association : table.getAssociations()) {
			if (association.getCardinality() == AssociationType.TO_ONE) {
				ToOneAssociationAttributeWriter toOneAssociationWriter = new ToOneAssociationAttributeWriter(TAB, association, columnIdx++);
				builder.append(toOneAssociationWriter.write());
				columnSql.add(toOneAssociationWriter.getSql());
				toOneAssociationNames.add(SchemaConstants.FOREIGN_KEY + association.getNameInEntity());
			}
		}
		builder.append("\n");
	}

	private void addSqlStatement(final StringBuilder builder, final List columnSql) {
		StringBuilder statement = new StringBuilder("CREATE TABLE ");
		statement.append(table.getName()).append(" (");
		statement.append(concat(columnSql, new None()));
		statement.append(")");

		builder.append(indent).append(TAB).append(format(CONSTANT_STRING, SchemaConstants.SQL_CREATION, statement.toString()));

		for (String column : filterIndexableColumns()) {
			StringBuilder index = new StringBuilder("CREATE INDEX ");
			index.append(table.getName().toLowerCase()).append("_").append(column.toLowerCase()).append(SchemaConstants.INDEX_SUFFIX);
			index.append(" on ").append(table.getName()).append(" (");
			index.append(column);
			index.append(")");
			builder.append(indent).append(TAB).append(format(CONSTANT_STRING, SchemaConstants.SQL_INDEX + "_" + column.toUpperCase(), index.toString()));
		}
	}

	private void addProjection(final StringBuilder builder, final List columnNames, final List toOneAssociationNames) {
		List columnsWithForeignKeys = new LinkedList(columnNames);
		columnsWithForeignKeys.addAll(toOneAssociationNames);

		builder.append(indent).append(TAB).append(format(CONSTANT_STRING_ARRAY, SchemaConstants.PROJECTION, concat(columnsWithForeignKeys, new Quote())));
	}

	private void addAttributes(final StringBuilder builder, final List columnNames) {
		builder.append(indent).append(TAB).append(format(CONSTANT_ATTRIBUTE_ARRAY, SchemaConstants.ATTRIBUTES, concat(columnNames, new UpperCase())));
		builder.append("\n");
	}

	private void addAssociations(final StringBuilder builder) {
		if (table.getAssociations().size() > 0) {
			builder.append(indent).append(TAB).append("public interface ").append(SchemaConstants.ASSOCIATIONS_INTERFACE).append(" {\n");
			for (Association association : table.getAssociations()) {
				AssociationsInterfaceWriter associationWriter = new AssociationsInterfaceWriter(indent + TAB + TAB, table, association);
				builder.append(associationWriter.write());
			}
			builder.append(indent).append(TAB).append("}\n");
		}
	}

	private void addEnd(final StringBuilder builder) {
		builder.append(indent).append("}\n");
	}

	private Collection filterIndexableColumns() {
		Collection indexable = new ArrayList();
		for (Column column : table.getColumns()) {
			if (column.isPrimary()) {
				indexable.add(column.getNameInEntity());
			}
		}
		for (Association association : table.getAssociations()) {
			if (AssociationType.TO_ONE == association.getCardinality()) {
				indexable.add(SchemaConstants.FOREIGN_KEY + association.getNameInEntity());
			}
		}
		return indexable;
	}

	private String concat(final Collection columns, final StringRefine refiner) {
		StringBuilder namesConcat = new StringBuilder();
		int counter = 0;
		for (String name : columns) {
			namesConcat.append(refiner.refine(name));
			if (counter++ < columns.size() - 1) {
				namesConcat.append(", ");
			}
		}
		return namesConcat.toString();
	}

	private interface StringRefine {
		String refine(String input);
	}

	private final class Quote implements StringRefine {
		@Override
		public String refine(final String input) {
			return "\"" + input + "\"";
		}
	}

	public class UpperCase implements StringRefine {
		@Override
		public String refine(final String input) {
			return input.toUpperCase(Locale.getDefault());
		}

	}

	private final class None implements StringRefine {
		@Override
		public String refine(final String input) {
			return input;
		}
	}

}