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/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Licensed 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 apoc.help;

import static apoc.util.Util.map;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.stream.Stream;
import org.neo4j.graphdb.Transaction;
import org.neo4j.procedure.Context;
import org.neo4j.procedure.Description;
import org.neo4j.procedure.Name;
import org.neo4j.procedure.NotThreadSafe;
import org.neo4j.procedure.Procedure;

public class Help {

    @Context
    public Transaction tx;

    private static final Set extended = new HashSet<>();

    public Help() {
        try (InputStream stream = getClass().getClassLoader().getResourceAsStream("extended.txt")) {
            if (stream != null) {
                BufferedReader reader = new BufferedReader(new InputStreamReader(stream));
                String name;
                while ((name = reader.readLine()) != null) {
                    extended.add(name);
                }
            }
        } catch (IOException e) {
            // Failed to load extended file
            throw new RuntimeException("Failed to load extended file with error: " + e.getMessage());
        }
    }

    @NotThreadSafe
    @Procedure("apoc.help")
    @Description(
            "Returns descriptions of the available APOC procedures and functions. If a keyword is provided, it will return only those procedures and functions that have the keyword in their name.")
    public Stream info(@Name("proc") String name) {
        boolean searchText = false;
        if (name != null) {
            name = name.trim();
            if (name.endsWith("+")) {
                name = name.substring(0, name.lastIndexOf('+')).trim();
                searchText = true;
            }
        }
        String filter =
                " WHERE name starts with 'apoc.' " + " AND ($name IS NULL  OR toLower(name) CONTAINS toLower($name) "
                        + " OR ($desc IS NOT NULL AND toLower(description) CONTAINS toLower($desc))) ";

        String proceduresQuery = "SHOW PROCEDURES yield name, description, signature, isDeprecated " + filter
                + "RETURN 'procedure' as type, name, description, signature, isDeprecated ";

        String functionsQuery = "SHOW FUNCTIONS yield name, description, signature, isDeprecated " + filter
                + "RETURN 'function' as type, name, description, signature, isDeprecated ";
        Map params = map("name", name, "desc", searchText ? name : null);
        Stream> proceduresResults = tx.execute(proceduresQuery, params).stream();
        Stream> functionsResults = tx.execute(functionsQuery, params).stream();

        return Stream.of(proceduresResults, functionsResults)
                .flatMap(results ->
                        results.map(row -> new HelpResult(row, !extended.contains((String) row.get("name")))));
    }
}