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package org.hsqldb.server;

import java.util.Map;

import org.hsqldb.Session;
import org.hsqldb.result.Result;
import org.hsqldb.result.ResultConstants;
import org.hsqldb.result.ResultMetaData;
import org.hsqldb.types.Type;

/**
 * @author Blaine Simpson (blaine dot simpson at admc dot com)
 * @since 1.9.0
 */
class StatementPortal {

    public Object[]                      parameters;
    public Result                        bindResult, ackResult;
    public String                        lcQuery;
    public String                        handle;
    private Map<String, StatementPortal> containingMap;
    private Session                      session;

    /**
     * Convenience wrapper for the 3-param constructor.
     *
     * @see #StatementPortal(String, OdbcPreparedStatement, Object[], Map)
     */
    public StatementPortal(
            String handle,
            OdbcPreparedStatement odbcPs,
            Map<String, StatementPortal> containingMap)
            throws RecoverableOdbcFailure {
        this(handle, odbcPs, new Object[0], containingMap);
    }

    /**
     * Instantiates a proxy ODBC StatementPortal object for the
     * Connection Session, and adds the new instance to the specified map.
     *
     * @param paramObjs Param values are either String or BinaryData instances
     */
    public StatementPortal(
            String handle,
            OdbcPreparedStatement odbcPs,
            Object[] paramObjs,
            Map<String, StatementPortal> containingMap)
            throws RecoverableOdbcFailure {

        this.handle        = handle;
        lcQuery            = odbcPs.query.toLowerCase();
        ackResult          = odbcPs.ackResult;
        session            = odbcPs.session;
        this.containingMap = containingMap;

        Type[] paramTypes = Type.emptyArray;

        switch (ackResult.getType()) {

            case ResultConstants.PREPARE_ACK :
                break;

            case ResultConstants.ERROR :
                throw new RecoverableOdbcFailure(ackResult);

            default :
                throw new RecoverableOdbcFailure(
                    "Output Result from secondary Statement prep is of "
                    + "unexpected type: " + ackResult.getType());
        }

        if (paramObjs.length < 1) {
            parameters = new Object[0];
        } else {
            ResultMetaData pmd = odbcPs.ackResult.parameterMetaData;

            if (pmd == null) {
                throw new RecoverableOdbcFailure("No metadata for Result ack");
            }

            paramTypes = pmd.getParameterTypes();

            if (paramTypes.length != paramObjs.length) {
                throw new RecoverableOdbcFailure(
                    null,
                    "Client didn't specify all " + paramTypes.length
                    + " parameters (" + paramObjs.length + ')',
                    "08P01");
            }

            parameters = new Object[paramObjs.length];

            try {
                for (int i = 0; i < parameters.length; i++) {
                    if (paramObjs[i] instanceof String) {
                        PgType pgType = PgType.getPgType(paramTypes[i]);

                        parameters[i] = pgType.getParameter(
                            (String) paramObjs[i],
                            session);
                    } else {
                        parameters[i] = paramObjs[i];
                    }
                }
            } catch (java.sql.SQLException se) {
                throw new RecoverableOdbcFailure("Typing failure: " + se);
            }
        }

        bindResult = Result.newPreparedExecuteRequest(
            paramTypes,
            odbcPs.ackResult.getStatementID());

        containingMap.put(handle, this);
    }

    /**
     * Releases resources for this instance
     * and removes this instance from the containing map.
     */
    public void close() {

        // TODO:  Free up resources!
        containingMap.remove(handle);
    }
}
