package com.megatim.fdxcommons.tools.database.queries.jpql;

import com.megatim.fdxcommons.model.enumeration.OrderByType;
import com.megatim.fdxcommons.model.pojo.OrderByDefinition;
import com.megatim.fdxcommons.tools.database.queries.metadata.jpql.JpqlQueryCriterion;
import java.util.List;

/**
 *
 * @author ASUS
 */
public class JqplQueryString {

    private final String simpleClassName;

    private final JpqlQueryCriterion queryCriterion;

    public JqplQueryString(String simpleClassName, JpqlQueryCriterion queryCriterion) {
        this.simpleClassName = simpleClassName;
        this.queryCriterion = queryCriterion;
    }

    public String selectQuery(List<OrderByDefinition> orderByFields) throws Exception {
        String classAlias = simpleClassName.toLowerCase().charAt(0) + "";
        String selectFromQueryPart = "SELECT " + classAlias + " FROM " + simpleClassName + " " + classAlias + " ";
        String whereQueryPart = new JpqlWhereQueryString(queryCriterion, classAlias).query();
        String query = selectFromQueryPart + " " + whereQueryPart + " " + orderByClause(classAlias, orderByFields);
        return query;
    }

    public String countQuery() throws Exception {
        String classAlias = simpleClassName.toLowerCase().charAt(0) + "";
        String selectFromQueryPart = "SELECT COUNT(*) FROM " + simpleClassName + " " + classAlias + " ";
        String whereQueryPart = new JpqlWhereQueryString(queryCriterion, classAlias).query();
        String query = selectFromQueryPart + " " + whereQueryPart;
        return query;
    }

    private String orderByClause(String classAlias, List<OrderByDefinition> orderByFields) {
        StringBuilder orderBy = new StringBuilder("ORDER BY ");
        if (orderByFields == null || orderByFields.isEmpty()) {
            return "";
        }

        for (OrderByDefinition def : orderByFields) {
            if (def.getFieldName() != null && !def.getFieldName().isEmpty()) {
                String orderByType = def.getOrderByType() != null ? def.getOrderByType().name() : OrderByType.ASC.name();
                orderBy.append(classAlias).append(".").append(def.getFieldName()).append(" ").append(orderByType).append(",");
            }
        }
        orderBy.replace(orderBy.length() - 1, orderBy.length(), "");//retirer la dernière virgule
        return orderBy.toString();
    }
}