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package host.anzo.commons.text;

import host.anzo.commons.utils.Rnd;
import host.anzo.core.startup.StartupComponent;
import lombok.Getter;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.jetbrains.annotations.NotNull;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

/**
 * @author ANZO
 * @since 8/17/2021
 */
@Slf4j
@StartupComponent("Service")
public class RandomNameGenerator {
    @Getter(lazy = true)
    private final static RandomNameGenerator instance = new RandomNameGenerator();

    private final List nouns;
    private final List adjectives;
    private final int prime;
    private int currentSeed;

    private RandomNameGenerator() {
        this.adjectives = load("name_generator/adjectives.txt");
        this.nouns = load("name_generator/nouns.txt");

        final int combo = size();

        int primeCombo = 2;
        while (primeCombo <= combo) {
            final int nextPrime = primeCombo + 1;
            primeCombo *= nextPrime;
        }
        this.prime = primeCombo + 1;
        this.currentSeed = (int)System.currentTimeMillis();
        log.info("Loaded [{}] words to dictionary.", size());
    }

    /**
     * Load text file to dictionary
     * @param name adjectives/nouns text file at resources
     * @return dictionary (list of loaded strings)
     */
    private @NotNull List load(String name) {
        final List list = new ArrayList<>();
        try (final InputStream inputStream = getClass().getClassLoader().getResourceAsStream(name);
             final InputStreamReader streamReader = new InputStreamReader(Objects.requireNonNull(inputStream));
             final BufferedReader reader = new BufferedReader(streamReader)) {
            String line;
            while ((line = reader.readLine()) != null) {
                list.add(line);
            }
        }
        catch (Exception e) {
            log.error("Error while loading {}", name, e);
        }
        return list;
    }

    /**
     * @return total size of the combined words.
     */
    public int size() {
        return nouns.size() * adjectives.size();
    }

    public synchronized String getName() {
        currentSeed = Math.abs(currentSeed + prime) % size();
        final int a = currentSeed % adjectives.size();
        final int n = currentSeed / adjectives.size();
        return StringUtils.capitalize(adjectives.get(a)) + StringUtils.capitalize(nouns.get(n)) + Rnd.get(1, 999);
    }
}