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package db.sql.api.impl.cmd.dbFun;

import db.sql.api.Cmd;
import db.sql.api.DbType;
import db.sql.api.SqlBuilderContext;
import db.sql.api.impl.cmd.Methods;
import db.sql.api.impl.tookit.SqlConst;
import db.sql.api.tookit.CmdUtils;

import java.io.Serializable;

public class IfNull extends BasicFunction {

    private final Cmd value;

    public IfNull(Cmd key, Cmd value) {
        super(SqlConst.IFNULL, key);
        this.value = value;
    }

    public IfNull(Cmd key, Serializable value) {
        this(key, Methods.cmd(value));
    }

    @Override
    public StringBuilder functionSql(Cmd module, Cmd parent, SqlBuilderContext context, StringBuilder sqlBuilder) {
        if (context.getDbType() == DbType.SQL_SERVER) {
            sqlBuilder.append(" ISNULL");
        } else if (context.getDbType() == DbType.ORACLE) {
            sqlBuilder.append(" NVL");
        } else if (context.getDbType() == DbType.PGSQL) {
            sqlBuilder.append(" COALESCE");
        } else {
            sqlBuilder.append(operator);
        }
        sqlBuilder.append(SqlConst.BRACKET_LEFT);
        this.key.sql(module, this, context, sqlBuilder);
        sqlBuilder.append(SqlConst.DELIMITER);
        this.value.sql(module, this, context, sqlBuilder);
        sqlBuilder.append(SqlConst.BRACKET_RIGHT);
        return sqlBuilder;
    }

    @Override
    public boolean contain(Cmd cmd) {
        return CmdUtils.contain(cmd, this.key, this.value);
    }
}