package cn.infstar.cmagicgem.config;

import org.bukkit.configuration.ConfigurationSection;
import org.bukkit.configuration.file.YamlConfiguration;
import org.bukkit.plugin.java.JavaPlugin;

import java.io.File;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;

public final class LanguageManager {
    private final JavaPlugin plugin;
    private volatile YamlConfiguration messages = new YamlConfiguration();
    private volatile String language = "zh_CN";

    public LanguageManager(JavaPlugin plugin) {
        this.plugin = plugin;
    }

    public void reload() {
        String configured = plugin.getConfig().getString("language",
                plugin.getConfig().getString("lang", "zh_CN"));
        language = safeName(configured);
        File file = new File(plugin.getDataFolder(), "languages/" + language + ".yml");
        YamlConfiguration loaded = YamlConfiguration.loadConfiguration(file);
        try (InputStream input = plugin.getResource("languages/" + language + ".yml")) {
            if (input != null) {
                YamlConfiguration bundled = YamlConfiguration.loadConfiguration(
                        new InputStreamReader(input, StandardCharsets.UTF_8));
                loaded.setDefaults(bundled);
            }
        } catch (Exception exception) {
            plugin.getLogger().warning("无法读取内置语言 " + language + ": " + exception.getMessage());
        }
        messages = loaded;
    }

    public String language() {
        return language;
    }

    public String text(String path, String fallback, Object... replacements) {
        String value = messages.getString(path, fallback);
        if (value == null) value = fallback == null ? "" : fallback;
        value = commandName(value);
        for (int index = 0; index + 1 < replacements.length; index += 2) {
            String key = String.valueOf(replacements[index]);
            String replacement = String.valueOf(replacements[index + 1]);
            value = value.replace("{" + key + "}", replacement).replace("%" + key + "%", replacement);
        }
        return value;
    }

    public String format(String path, String fallback, Object... arguments) {
        String pattern = text(path, fallback);
        try {
            return String.format(Locale.ROOT, pattern, arguments);
        } catch (RuntimeException exception) {
            return pattern;
        }
    }

    public List<String> section(String path) {
        ConfigurationSection section = messages.getConfigurationSection(path);
        if (section == null) return List.of();
        List<String> result = new ArrayList<>();
        for (String key : section.getKeys(false)) {
            String value = section.getString(key);
            if (value != null) result.add(commandName(value));
        }
        return List.copyOf(result);
    }

    private String commandName(String value) {
        return value;
    }

    private String safeName(String configured) {
        if (configured == null || !configured.matches("[A-Za-z0-9_-]+")) return "zh_CN";
        return configured;
    }
}