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package ru.curs.celesta.dbutils.term;

import ru.curs.celesta.dbutils.QueryBuildingHelper;
import ru.curs.celesta.dbutils.stmt.ParameterSetter;

import java.util.List;

/**
 * Disjunction of two where clauses.
 */
public final class OrTerm extends WhereTerm {
    private final WhereTerm l;
    private final WhereTerm r;

    private OrTerm(WhereTerm l, WhereTerm r) {
        this.l = l;
        this.r = r;
    }

    static WhereTerm construct(WhereTerm l, WhereTerm r) {
        if (l instanceof AlwaysTrue || r instanceof AlwaysTrue) {
            return AlwaysTrue.TRUE;
        } else if (l instanceof AlwaysFalse) {
            return r;
        } else if (r instanceof AlwaysFalse) {
            return l;
        } else {
            return new OrTerm(l, r);
        }
    }

    @Override
    public String getWhere()  {
        String ls = (l instanceof OrTerm) ? ((OrTerm) l).getOpenWhere() : l.getWhere();
        String rs = (r instanceof OrTerm) ? ((OrTerm) r).getOpenWhere() : r.getWhere();
        return String.format("(%s or %s)", ls, rs);
    }

    private String getOpenWhere()  {
        return String.format("%s or %s", l.getWhere(), r.getWhere());
    }

    @Override
    public void programParams(
            List program, QueryBuildingHelper queryBuildingHelper
    )  {
        l.programParams(program, queryBuildingHelper);
        r.programParams(program, queryBuildingHelper);
    }
}