/*
 *  Copyright (c) 2004-2022, University of Oslo
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are met:
 *  Redistributions of source code must retain the above copyright notice, this
 *  list of conditions and the following disclaimer.
 *
 *  Redistributions in binary form must reproduce the above copyright notice,
 *  this list of conditions and the following disclaimer in the documentation
 *  and/or other materials provided with the distribution.
 *  Neither the name of the HISP project nor the names of its contributors may
 *  be used to endorse or promote products derived from this software without
 *  specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 *  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 *  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 *  ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 *  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 *  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 *  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.hisp.dhis.android.core.program.programindicatorengine.internal.function

import org.hisp.dhis.android.core.parser.internal.expression.CommonExpressionVisitor
import org.hisp.dhis.android.core.parser.internal.expression.ExpressionItem
import org.hisp.dhis.parser.expression.antlr.ExpressionParser.ExprContext

internal class D2Zing : ExpressionItem {

    override fun evaluate(ctx: ExprContext, visitor: CommonExpressionVisitor): Any {
        val argument = visitor.castStringVisit(ctx.expr(0))
        val value = argument.toDouble()

        return if (value < 0) 0.toString() else argument
    }

    override fun getSql(ctx: ExprContext, visitor: CommonExpressionVisitor): Any {
        val argument = visitor.visitAllowingNulls(ctx.expr(0))
        return "COALESCE(CASE WHEN $argument < 0 THEN 0 ELSE $argument END, 0)"
    }
}
