termora/src/main/kotlin/app/termora/I18n.kt

package app.termora

import org.apache.commons.lang3.LocaleUtils
import org.apache.commons.text.StringSubstitutor
import org.slf4j.LoggerFactory
import java.text.MessageFormat
import java.util.*

object I18n {
    private val log = LoggerFactory.getLogger(I18n::class.java)
    private val bundle by lazy {
        val bundle = ResourceBundle.getBundle("i18n/messages", Locale.getDefault())
        if (log.isInfoEnabled) {
            log.info("I18n: {}", bundle.baseBundleName ?: "null")
        }
        return@lazy bundle
    }

    private val substitutor by lazy { StringSubstitutor { key -> getString(key) } }
    private val supportedLanguages = sortedMapOf(
        "en_US" to "English",
        "zh_CN" to "简体中文",
        "zh_TW" to "繁體中文",
    )

    fun containsLanguage(locale: Locale): String? {
        for (key in supportedLanguages.keys) {
            val e = LocaleUtils.toLocale(key)
            if (LocaleUtils.toLocale(key) == locale ||
                (e.language.equals(locale.language, true) && e.country.equals(locale.country, true))
            ) {
                return key
            }
        }
        return null
    }

    fun getLanguages(): Map<String, String> {
        return supportedLanguages
    }

    fun getString(key: String, vararg args: Any): String {
        val text = getString(key)
        if (args.isNotEmpty()) {
            return MessageFormat.format(text, *args)
        }
        return text
    }


    fun getString(key: String): String {
        try {
            return substitutor.replace(bundle.getString(key))
        } catch (e: MissingResourceException) {
            if (log.isWarnEnabled) {
                log.warn(e.message, e)
            }
            return key
        }
    }


}