/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.syncope.core.persistence.jpa.dao;

import jakarta.persistence.EntityManager;
import jakarta.persistence.EntityManagerFactory;
import java.time.format.DateTimeFormatter;
import java.util.List;
import java.util.Optional;
import org.apache.syncope.common.lib.types.AttrSchemaType;
import org.apache.syncope.core.persistence.api.attrvalue.PlainAttrValidationManager;
import org.apache.syncope.core.persistence.api.dao.AnyObjectDAO;
import org.apache.syncope.core.persistence.api.dao.GroupDAO;
import org.apache.syncope.core.persistence.api.dao.PlainSchemaDAO;
import org.apache.syncope.core.persistence.api.dao.RealmSearchDAO;
import org.apache.syncope.core.persistence.api.dao.UserDAO;
import org.apache.syncope.core.persistence.api.dao.search.AttrCond;
import org.apache.syncope.core.persistence.api.entity.AnyUtilsFactory;
import org.apache.syncope.core.persistence.api.entity.EntityFactory;
import org.apache.syncope.core.persistence.api.entity.PlainAttr;
import org.apache.syncope.core.persistence.api.entity.PlainAttrValue;
import org.apache.syncope.core.persistence.api.entity.PlainSchema;
import org.apache.syncope.core.provisioning.api.serialization.POJOHelper;
import org.springframework.data.domain.Sort;

public class MySQLJPAAnySearchDAO extends AbstractJPAAnySearchDAO {

    public MySQLJPAAnySearchDAO(
            final RealmSearchDAO realmSearchDAO,
            final UserDAO userDAO,
            final GroupDAO groupDAO,
            final AnyObjectDAO anyObjectDAO,
            final PlainSchemaDAO schemaDAO,
            final EntityFactory entityFactory,
            final AnyUtilsFactory anyUtilsFactory,
            final PlainAttrValidationManager validator,
            final EntityManagerFactory entityManagerFactory,
            final EntityManager entityManager) {

        super(
                realmSearchDAO,
                userDAO,
                groupDAO,
                anyObjectDAO,
                schemaDAO,
                entityFactory,
                anyUtilsFactory,
                validator,
                entityManagerFactory,
                entityManager);
    }

    @Override
    protected void parseOrderByForPlainSchema(
            final SearchSupport svs,
            final OrderBySupport obs,
            final OrderBySupport.Item item,
            final Sort.Order clause,
            final PlainSchema schema,
            final String fieldName) {

        // keep track of involvement of non-mandatory schemas in the order by clauses
        obs.nonMandatorySchemas = !"true".equals(schema.getMandatoryCondition());

        obs.views.add(svs.field());

        item.select = new StringBuilder().append(schema.isUniqueConstraint()
                ? "( SELECT JSON_UNQUOTE(JSON_EXTRACT(usa.attrUniqueValue, '$." + key(schema.getType()) + "')) "
                : "( SELECT usa." + key(schema.getType())).
                append(" FROM ").
                append(svs.field().name()).
                append(" usa WHERE usa.any_id = ").
                append(svs.field().alias()).
                append(".any_id").
                append(" AND usa.plainSchema ='").append(fieldName).append("'").
                append(" LIMIT 1").
                append(") AS ").append(fieldName).toString();
        item.where = "plainSchema = '" + fieldName + '\'';
        item.orderBy = fieldName + ' ' + clause.getDirection().name();
    }

    protected AnySearchNode.Leaf filJSONAttrQuery(
            final SearchSupport.SearchView from,
            final PlainAttrValue attrValue,
            final PlainSchema schema,
            final AttrCond cond,
            final boolean not,
            final List<Object> parameters) {

        String key = key(schema.getType());

        String value = Optional.ofNullable(attrValue.getDateValue()).
                map(DateTimeFormatter.ISO_OFFSET_DATE_TIME::format).
                orElseGet(cond::getExpression);

        boolean lower = (schema.getType() == AttrSchemaType.String || schema.getType() == AttrSchemaType.Enum)
                && (cond.getType() == AttrCond.Type.IEQ || cond.getType() == AttrCond.Type.ILIKE);

        StringBuilder clause = new StringBuilder("plainSchema=?").append(setParameter(parameters, cond.getSchema())).
                append(" AND ").
                append(lower ? "LOWER(" : "").
                append(schema.isUniqueConstraint()
                        ? "JSON_UNQUOTE(JSON_EXTRACT(attrUniqueValue, '$." + key + "'))"
                        : key).
                append(lower ? ')' : "");

        switch (cond.getType()) {
            case LIKE:
            case ILIKE:
                if (not) {
                    clause.append("NOT ");
                }
                clause.append(" LIKE ");
                break;

            case GE:
                if (not) {
                    clause.append('<');
                } else {
                    clause.append(">=");
                }
                break;

            case GT:
                if (not) {
                    clause.append("<=");
                } else {
                    clause.append('>');
                }
                break;

            case LE:
                if (not) {
                    clause.append('>');
                } else {
                    clause.append("<=");
                }
                break;

            case LT:
                if (not) {
                    clause.append(">=");
                } else {
                    clause.append('<');
                }
                break;

            case EQ:
            case IEQ:
            default:
                if (not) {
                    clause.append('!');
                }
                clause.append('=');
        }

        clause.append(lower ? "LOWER(" : "").
                append('?').append(setParameter(parameters, value)).
                append(lower ? ")" : "");

        return new AnySearchNode.Leaf(from, clause.toString());
    }

    @Override
    protected AttrCondQuery getQuery(
            final AttrCond cond,
            final boolean not,
            final CheckResult<AttrCond> checked,
            final List<Object> parameters,
            final SearchSupport svs) {

        // normalize NULL / NOT NULL checks
        if (not) {
            if (cond.getType() == AttrCond.Type.ISNULL) {
                cond.setType(AttrCond.Type.ISNOTNULL);
            } else if (cond.getType() == AttrCond.Type.ISNOTNULL) {
                cond.setType(AttrCond.Type.ISNULL);
            }
        }

        switch (cond.getType()) {
            case ISNOTNULL -> {
                return new AttrCondQuery(true, new AnySearchNode.Leaf(
                        svs.field(),
                        "JSON_SEARCH("
                        + "plainAttrs, 'one', '" + checked.schema().getKey() + "', NULL, '$[*].schema'"
                        + ") IS NOT NULL"));
            }

            case ISNULL -> {
                return new AttrCondQuery(true, new AnySearchNode.Leaf(
                        svs.field(),
                        "JSON_SEARCH("
                        + "plainAttrs, 'one', '" + checked.schema().getKey() + "', NULL, '$[*].schema'"
                        + ") IS NULL"));
            }

            default -> {
                if (!not && cond.getType() == AttrCond.Type.EQ) {
                    PlainAttr container = new PlainAttr();
                    container.setPlainSchema(checked.schema());
                    if (checked.schema().isUniqueConstraint()) {
                        container.setUniqueValue(checked.value());
                    } else {
                        container.add(checked.value());
                    }

                    return new AttrCondQuery(true, new AnySearchNode.Leaf(
                            svs.field(),
                            "JSON_CONTAINS("
                            + "plainAttrs, '" + POJOHelper.serialize(List.of(container)).replace("'", "''")
                            + "')"));
                } else {
                    AnySearchNode.Leaf node;
                    if (not && checked.schema().isMultivalue()) {
                        AnySearchNode.Leaf notNode = filJSONAttrQuery(
                                svs.field(),
                                checked.value(),
                                checked.schema(),
                                cond,
                                false,
                                parameters);
                        node = new AnySearchNode.Leaf(
                                notNode.getFrom(),
                                "sv.any_id NOT IN ("
                                + "SELECT any_id FROM " + notNode.getFrom().name()
                                + " WHERE " + notNode.getClause().replace(notNode.getFrom().alias() + ".", "")
                                + ")");
                    } else {
                        node = filJSONAttrQuery(
                                svs.field(),
                                checked.value(),
                                checked.schema(),
                                cond,
                                not,
                                parameters);
                    }
                    return new AttrCondQuery(true, node);
                }
            }
        }
    }
}
