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/*
 * 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.
 *
 * Other licenses:
 * -----------------------------------------------------------------------------
 * Commercial licenses for this work are available. These replace the above
 * ASL 2.0 and offer limited warranties, support, maintenance, and commercial
 * database integrations.
 *
 * For more information, please visit: http://www.jooq.org/licenses
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */

package org.jooq.meta;

import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

import org.jooq.Catalog;
import org.jooq.DSLContext;
import org.jooq.Field;
import org.jooq.ForeignKey;
import org.jooq.Meta;
import org.jooq.Schema;
import org.jooq.Sequence;
import org.jooq.Table;
import org.jooq.UniqueKey;
import org.jooq.impl.DSL;

/**
 * The base implementation for {@link Meta} based databases.
 *
 * @author Lukas Eder
 */
public abstract class AbstractMetaDatabase extends AbstractDatabase {

    private List catalogs;
    private List  schemas;

    @Override
    protected DSLContext create0() {
        return DSL.using(getConnection());
    }

    abstract protected Meta getMeta0();

    @Override
    protected void loadPrimaryKeys(DefaultRelations relations) throws SQLException {
    }

    @Override
    protected void loadUniqueKeys(DefaultRelations relations) throws SQLException {
        for (Schema schema : getSchemasFromMeta()) {
            SchemaDefinition s = getSchema(schema.getName());

            if (s != null) {
                for (Table table : schema.getTables()) {
                    TableDefinition t = getTable(s, table.getName());

                    if (t != null) {
                        UniqueKey key = table.getPrimaryKey();

                        if (key != null)
                            for (Field field : key.getFields())
                                relations.addPrimaryKey("PK_" + key.getTable().getName(), t, t.getColumn(field.getName()));
                    }
                }
            }
        }
    }

    @Override
    protected void loadForeignKeys(DefaultRelations relations) throws SQLException {
        for (Schema referencingS : getSchemasFromMeta()) {
            SchemaDefinition referencingSD = getSchema(referencingS.getName());

            if (referencingSD != null) {
                for (Table referencingT : referencingS.getTables()) {
                    TableDefinition referencingTD = getTable(referencingSD, referencingT.getName());

                    if (referencingTD != null) {
                        for (ForeignKey fk : referencingT.getReferences()) {

                            UniqueKey uk = fk.getKey();
                            if (uk != null) {
                                Table referencedT = uk.getTable();

                                if (referencedT != null) {
                                    Schema referencedS = referencedT.getSchema();

                                    if (referencedS == null)
                                        referencedS = referencingS;

                                    SchemaDefinition referencedSD = getSchema(referencedS.getName());
                                    TableDefinition referencedTD = getTable(referencedSD, referencedT.getName());

                                    addForeignKey:
                                    if (referencedTD != null) {
                                        for (Field fkField : fk.getFields())
                                            if (referencingTD.getColumn(fkField.getName()) == null)
                                                break addForeignKey;

                                        for (Field fkField : fk.getFields())
                                            relations.addForeignKey(
                                                fk.getName(),
                                                referencingTD,
                                                referencingTD.getColumn(fkField.getName()),
                                                uk.getName(),
                                                referencedTD
                                            );
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
    }

    @Override
    protected void loadCheckConstraints(DefaultRelations r) throws SQLException {
    }

    @Override
    protected List getCatalogs0() throws SQLException {
        List result = new ArrayList<>();

        for (Catalog catalog : getCatalogsFromMeta())
            result.add(new CatalogDefinition(this, catalog.getName(), ""));

        result.sort(COMP);
        return result;
    }

    private List getCatalogsFromMeta() {
        if (catalogs == null)
            catalogs = new ArrayList<>(getMeta0().getCatalogs());

        return catalogs;
    }

    @Override
    protected List getSchemata0() throws SQLException {
        List result = new ArrayList<>();

        for (Schema schema : getSchemasFromMeta()) {
            if (schema.getCatalog() != null) {
                CatalogDefinition catalog = getCatalog(schema.getCatalog().getName());

                if (catalog != null)
                    result.add(new SchemaDefinition(this, schema.getName(), "", catalog));
            }
            else
                result.add(new SchemaDefinition(this, schema.getName(), ""));
        }

        result.sort(COMP);
        return result;
    }

    private List getSchemasFromMeta() {
        if (schemas == null)
            schemas = new ArrayList<>(getMeta0().getSchemas());

        return schemas;
    }

    @Override
    protected List getSequences0() throws SQLException {
        List result = new ArrayList<>();

        for (Schema schema : getSchemasFromMeta()) {
            for (Sequence sequence : schema.getSequences()) {
                SchemaDefinition sd = getSchema(schema.getName());

                DataTypeDefinition type = new DefaultDataTypeDefinition(
                    this,
                    sd,
                    sequence.getDataType().getTypeName()
                );

                result.add(new DefaultSequenceDefinition(
                    sd, sequence.getName(), type));
            }
        }

        result.sort(COMP);
        return result;
    }

    @Override
    protected List getTables0() throws SQLException {
        List result = new ArrayList<>();

        for (Schema schema : getSchemasFromMeta()) {
            SchemaDefinition sd = getSchema(schema.getName());

            if (sd != null)
                for (Table table : schema.getTables())
                    result.add(new DefaultMetaTableDefinition(sd, table));
        }

        result.sort(COMP);
        return result;
    }

    @Override
    protected List getEnums0() throws SQLException {
        List result = new ArrayList<>();
        return result;
    }

    @Override
    protected List getDomains0() throws SQLException {
        List result = new ArrayList<>();
        return result;
    }

    @Override
    protected List getUDTs0() throws SQLException {
        List result = new ArrayList<>();
        return result;
    }

    @Override
    protected List getArrays0() throws SQLException {
        List result = new ArrayList<>();
        return result;
    }

    @Override
    protected List getRoutines0() throws SQLException {
        List result = new ArrayList<>();
        return result;
    }

    @Override
    protected List getPackages0() throws SQLException {
        List result = new ArrayList<>();
        return result;
    }

    private static final Comparator COMP = Comparator.comparing(Definition::getQualifiedInputName);
}