package com.adzel.velocitybroadcast;

import java.io.BufferedWriter;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.LinkedHashMap;
import java.util.Map;

import org.slf4j.Logger;
import org.yaml.snakeyaml.DumperOptions;
import org.yaml.snakeyaml.Yaml;
import org.yaml.snakeyaml.representer.Representer;

public class ConfigHandler {
    private final Path configPath;
    private final Logger logger;

    private boolean debugEnabled = false;
    private boolean versionCheckEnabled = true;
    private String prefix = "&9&l[&3&lServer&9&l]&r ";

    private String dbType = "sqlite";
    private String dbHost = "localhost";
    private int dbPort = 3306;
    private String dbName = "velocitybroadcast";
    private String dbUser = "vb_user";
    private String dbPassword = "securepassword";

    private static final String CURRENT_VERSION = VelocityBroadcast.PLUGIN_VERSION;
    private static final String VERSION_LINE = "# DO NOT EDIT\nPlugin Version: '" + CURRENT_VERSION + "' # Do not edit this value, as it will mess up version checking and break the plugin";

    private final Yaml yaml;

    public ConfigHandler(Path configPath, Logger logger) {
        this.configPath = configPath;
        this.logger = logger;

        DumperOptions options = new DumperOptions();
        options.setDefaultFlowStyle(DumperOptions.FlowStyle.BLOCK);
        options.setIndent(2);
        options.setPrettyFlow(true);

        Representer representer = new Representer(options);
        representer.getPropertyUtils().setSkipMissingProperties(true);

        yaml = new Yaml(representer, options);
    }

    @SuppressWarnings("unchecked")
    public void load() {
        try {
            Files.createDirectories(configPath.getParent());

            boolean shouldSave = false;

            if (!Files.exists(configPath)) {
                save();
                return;
            }

            String fileVersion = Files.readAllLines(configPath).stream()
                .filter(line -> line.startsWith("Plugin Version:"))
                .map(line -> line.replaceAll(".*'(.*?)'.*", "$1").trim())
                .findFirst()
                .orElse(null);

            if (fileVersion == null || !fileVersion.equals(CURRENT_VERSION)) {
                shouldSave = true;
            }

            Map<String, Object> root = yaml.load(Files.newBufferedReader(configPath));
            if (root == null) root = new LinkedHashMap<>();

            Map<String, Object> general = (Map<String, Object>) root.getOrDefault("general", new LinkedHashMap<>());
            debugEnabled = Boolean.parseBoolean(String.valueOf(general.getOrDefault("debug-messages-enabled", "false")));
            versionCheckEnabled = Boolean.parseBoolean(String.valueOf(general.getOrDefault("version-check-enabled", "true")));
            prefix = String.valueOf(general.getOrDefault("prefix", "&9&l[&3&lServer&9&l]&r "));

            Map<String, Object> database = (Map<String, Object>) root.getOrDefault("database", new LinkedHashMap<>());
            dbType = String.valueOf(database.getOrDefault("type", "sqlite"));
            dbHost = String.valueOf(database.getOrDefault("host", "localhost"));
            dbPort = Integer.parseInt(String.valueOf(database.getOrDefault("port", "3306")));
            dbName = String.valueOf(database.getOrDefault("name", "velocitybroadcast"));
            dbUser = String.valueOf(database.getOrDefault("user", "vb_user"));
            dbPassword = String.valueOf(database.getOrDefault("password", "securepassword"));

            if (shouldSave) {
                save();
            }

        } catch (IOException e) {
            logger.error("Failed to load VelocityBroadcast config!", e);
        }
    }

    public void save() {
        try {
            Files.createDirectories(configPath.getParent());

            Map<String, Object> general = new LinkedHashMap<>();
            general.put("debug-messages-enabled", debugEnabled);
            general.put("version-check-enabled", versionCheckEnabled);
            general.put("prefix", prefix);

            Map<String, Object> database = new LinkedHashMap<>();
            database.put("type", dbType);
            database.put("host", dbHost);
            database.put("port", dbPort);
            database.put("name", dbName);
            database.put("user", dbUser);
            database.put("password", dbPassword);

            Map<String, Object> root = new LinkedHashMap<>();
            root.put("general", general);
            root.put("database", database);

            try (BufferedWriter writer = Files.newBufferedWriter(configPath)) {
                writer.write(VERSION_LINE + "\n\n");
                yaml.dump(root, writer);
            }

        } catch (IOException e) {
            logger.error("Failed to save VelocityBroadcast config!", e);
        }
    }

    public void reload() {
        load();
    }

    public boolean isDebugEnabled() {
        return debugEnabled;
    }

    public boolean isVersionCheckEnabled() {
        return versionCheckEnabled;
    }

    public String getPrefix() {
        return prefix;
    }

    public void setPrefix(String newPrefix) {
        this.prefix = newPrefix;
        save();
    }

    public String getDbType() {
        return dbType;
    }

    public String getDbHost() {
        return dbHost;
    }

    public int getDbPort() {
        return dbPort;
    }

    public String getDbName() {
        return dbName;
    }

    public String getDbUser() {
        return dbUser;
    }

    public String getDbPassword() {
        return dbPassword;
    }
}