import { defaultLanguage, allLanguages } from '../locales/index.js'

export function getAllLanguages() {
    return allLanguages;
}

export function getLanguage(locale) {
    return allLanguages[locale];
}

export function getDefaultLanguage() {
    if (!window || !window.navigator) {
        return defaultLanguage;
    }

    let browserLocale = window.navigator.browserLanguage || window.navigator.language;

    if (!browserLocale) {
        return defaultLanguage;
    }

    if (!allLanguages[browserLocale]) {
        const locale = getLocaleFromLanguageAlias(browserLocale);

        if (locale) {
            browserLocale = locale;
        }
    }

    if (!allLanguages[browserLocale]) {
        return defaultLanguage;
    }

    return browserLocale;
}

export function getI18nOptions() {
    return {
        locale: defaultLanguage,
        fallbackLocale: defaultLanguage,
        formatFallbackMessages: true,
        messages: (function () {
            const messages = {};

            for (let locale in allLanguages) {
                if (!Object.prototype.hasOwnProperty.call(allLanguages, locale)) {
                    continue;
                }

                const lang = allLanguages[locale];
                messages[locale] = lang.content;
            }

            return messages;
        })()
    };
}

function getLocaleFromLanguageAlias(alias) {
    for (let locale in allLanguages) {
        if (!Object.prototype.hasOwnProperty.call(allLanguages, locale)) {
            continue;
        }

        const lang = allLanguages[locale];
        const aliases = lang.aliases;

        if (!aliases || aliases.length < 1) {
            continue;
        }

        for (let i = 0; i < aliases.length; i++) {
            if (aliases[i] === alias) {
                return locale;
            }
        }
    }

    return null;
}