//- No-op in case this is running outside of SillyTavern
const { extension_settings } = typeof self.SillyTavern !== 'undefined' ? self.SillyTavern.getContext() : { extension_settings: {} };

class Internationalization {
    constructor() {
        this.currentLanguage = 'en';
        this.translations = {};
    }

    async init() {
        const savedLanguage = localStorage.getItem('rpgCompanionLanguage') || 'en';
        this.currentLanguage = savedLanguage;

        await this.loadTranslations(this.currentLanguage);
        this.applyTranslations(document.body);

        const langSelect = document.getElementById('rpg-companion-language-select');
        if (langSelect) {
            langSelect.value = this.currentLanguage;
        }
    }

    async loadTranslations(lang) {
        const fetchUrl = `/scripts/extensions/third-party/rpg-companion-sillytavern/src/i18n/${lang}.json`;
        try {
            const response = await fetch(fetchUrl);
            if (!response.ok) {
                console.error(`[RPG-Companion-i18n] Failed to load translation file for ${lang}. Status: ${response.status}`);
                if (lang !== 'en') {
                    return this.loadTranslations('en');
                }
                return;
            }
            this.translations = await response.json();
        } catch (error) {
            console.error('[RPG-Companion-i18n] CRITICAL error loading translation file:', error);
        }
    }

    applyTranslations(rootElement) {
        if (!rootElement) {
            return;
        }
        const elements = rootElement.querySelectorAll('[data-i18n-key]');
        elements.forEach(element => {
            const key = element.dataset.i18nKey;
            const translation = this.getTranslation(key);
            if (translation) {
                element.textContent = translation;
            }
        });
    }

    getTranslation(key) {
        return this.translations[key] || null;
    }

    async setLanguage(lang) {
        this.currentLanguage = lang;
        localStorage.setItem('rpgCompanionLanguage', lang);
        await this.loadTranslations(lang);
        this.applyTranslations(document.body);
    }
}

export const i18n = new Internationalization();