/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
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 *
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 * 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
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package org.jooq.meta.sqlite;

import static org.jooq.conf.ParseWithMetaLookups.THROW_ON_FAILURE;
import static org.jooq.impl.DSL.field;
import static org.jooq.impl.DSL.inline;
import static org.jooq.impl.DSL.name;
import static org.jooq.impl.DSL.selectOne;
import static org.jooq.meta.sqlite.sqlite_master.SQLiteMaster.SQLITE_MASTER;
import static org.jooq.tools.StringUtils.isBlank;

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

import org.jooq.Configuration;
import org.jooq.Field;
import org.jooq.Record;
import org.jooq.Table;
import org.jooq.TableOptions.TableType;
import org.jooq.impl.DSL;
import org.jooq.meta.AbstractTableDefinition;
import org.jooq.meta.ColumnDefinition;
import org.jooq.meta.DefaultColumnDefinition;
import org.jooq.meta.DefaultDataTypeDefinition;
import org.jooq.meta.SchemaDefinition;
import org.jooq.meta.sqlite.sqlite_master.SQLiteMaster;

SQLite table definition
Author:
Lukas Eder/**
 * SQLite table definition
 *
 * @author Lukas Eder
 */
public class SQLiteTableDefinition extends AbstractTableDefinition {

    private static Boolean existsSqliteSequence;

    public SQLiteTableDefinition(SchemaDefinition schema, String name, String comment) {
        super(schema, name, comment);
    }

    public SQLiteTableDefinition(SchemaDefinition schema, String name, String comment, TableType tableType, String source) {
        super(schema, name, comment, tableType, source);
    }

    @Override
    public List<ColumnDefinition> getElements0() throws SQLException {
        List<ColumnDefinition> result = new ArrayList<>();

        Field<String> fName = field(name("name"), String.class);
        Field<String> fType = field(name("type"), String.class);
        Field<Boolean> fNotnull = field(name("notnull"), boolean.class);
        Field<String> fDefaultValue = field(name("dflt_value"), String.class);
        Field<Integer> fPk = field(name("pk"), int.class);

        Table<?> interpreted = null;
        for (Record record : create()
            .select(fName, fType, fNotnull, fDefaultValue, fPk)
            .from("pragma_table_info({0})", inline(getName()))
        ) {

            String name = record.get(fName);
            String dataType = record.get(fType)
                                    .replaceAll("\\(\\d+(\\s*,\\s*\\d+)?\\)", "");
            Number precision = parsePrecision(record.get(fType));
            Number scale = parseScale(record.get(fType));

            // SQLite identities are primary keys whose tables are mentioned in
            // sqlite_sequence
            int pk = record.get(fPk);
            boolean identity = false;

            // [#8278] SQLite doesn't store the data type for all views
            if (isView() && (isBlank(dataType) || "other".equals(dataType))) {
                if (interpreted == null) {
                    try {
                        Configuration c = create().configuration().derive();
                        c.settings().withParseWithMetaLookups(THROW_ON_FAILURE);
                        interpreted = c.dsl().meta(
                            create().select(SQLiteMaster.SQL)
                                    .from(SQLITE_MASTER)
                                    .where(SQLiteMaster.TBL_NAME.eq(getInputName()))
                                    .fetchOne(SQLiteMaster.SQL)
                        ).getTables(getInputName()).get(0);
                    }
                    catch (Exception e) {
                        throw new RuntimeException("Something went wrong when interpreting the SQL of view " + getInputName());
                    }
                }

                Field<?> f = interpreted.field(name);

                if (f != null) {
                    dataType = f.getDataType().getName();
                    precision = f.getDataType().precision();
                    scale = f.getDataType().scale();
                }
            }

            if (pk > 0) {

                // [#6854] sqlite_sequence only contains identity information once a table contains records.
                identity |= existsSqliteSequence() && create()
                    .fetchOne("select count(*) from sqlite_sequence where name = ?", getName())
                    .get(0, Boolean.class);

                if (!identity && !create().fetchExists(selectOne().from("{0}", DSL.name(getName()))))
                    identity = create()
                        .select(SQLiteMaster.SQL)
                        .from(SQLITE_MASTER)
                        .where(SQLiteMaster.NAME.eq(getName()))
                        .fetchOneInto(String.class)
                        .matches("(?s:.*\\b" + getName() + "\\b[^,]*(?i:\\bautoincrement\\b)[^,]*.*)");
            }

            DefaultDataTypeDefinition type = new DefaultDataTypeDefinition(
                getDatabase(),
                getSchema(),
                dataType,
                precision,
                precision,
                scale,
                !record.get(fNotnull),
                record.get(fDefaultValue)
            );

            result.add(new DefaultColumnDefinition(
                getDatabase().getTable(getSchema(), getName()),
                name,
                result.size() + 1,
                type,
                identity,
                null
            ));
        }

        return result;
    }

    private boolean existsSqliteSequence() {
        if (existsSqliteSequence == null) {
            existsSqliteSequence = create()
                .selectCount()
                .from(SQLITE_MASTER)
                .where(SQLiteMaster.NAME.lower().eq("sqlite_sequence"))
                .fetchOne(0, boolean.class);
        }

        return existsSqliteSequence;
    }
}