package org.es.jdbc.api;

import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Types;

public class ElasticResultSetMetaData implements ResultSetMetaData {

    protected static final String JSON_DATA_COL_NAME = "__INDEX_DOCS__";

    @Override
    public int getColumnCount() throws SQLException {
        return 1;
    }

    @Override
    public boolean isAutoIncrement(int column) throws SQLException {
        return true;
    }

    @Override
    public boolean isCaseSensitive(int column) throws SQLException {
        return true;
    }

    @Override
    public boolean isSearchable(int column) throws SQLException {
        return false;
    }

    @Override
    public boolean isCurrency(int column) throws SQLException {
        return false;
    }

    @Override
    public int isNullable(int column) throws SQLException {
        return columnNoNulls;
    }

    @Override
    public boolean isSigned(int column) throws SQLException {
        return false;
    }


    @Override
    public int getColumnDisplaySize(int column) throws SQLException {
        return 0;
    }

    @Override
    public String getColumnLabel(int column) throws SQLException {
        return JSON_DATA_COL_NAME;
    }

    @Override
    public String getColumnName(int column) throws SQLException {
        return JSON_DATA_COL_NAME;
    }

    @Override
    public String getSchemaName(int column) throws SQLException {
        return null;
    }

    @Override
    public int getPrecision(int column) throws SQLException {
        return 0;
    }

    @Override
    public int getScale(int column) throws SQLException {
        return 0;
    }


    @Override
    public String getTableName(int column) throws SQLException {
        return null;
    }

    @Override
    public String getCatalogName(int column) throws SQLException {
        return null;
    }

    @Override
    public int getColumnType(int column) throws SQLException {
        return Types.VARCHAR;
    }

    @Override
    public String getColumnTypeName(int column) throws SQLException {
        return "String";
    }

    @Override
    public boolean isReadOnly(int column) throws SQLException {
        return true;
    }


    @Override
    public boolean isWritable(int column) throws SQLException {
        return false;
    }

    @Override
    public boolean isDefinitelyWritable(int column) throws SQLException {
        return false;
    }

    @Override
    public String getColumnClassName(int column) throws SQLException {
        return String.class.toString();
    }

    @Override
    @SuppressWarnings("unchecked")
    public final <T> T unwrap(final Class<T> iface) throws SQLException {
        if (isWrapperFor(iface)) {
            return (T) this;
        }
        throw new SQLException(String.format("[%s] cannot be unwrapped as [%s]", getClass().getName(), iface.getName()));
    }

    @Override
    public final boolean isWrapperFor(final Class<?> iface) throws SQLException {
        return iface.isInstance(this);
    }
}