|
| 1 | +"use client"; |
| 2 | + |
| 3 | +import React, { useEffect, useState, useCallback } from "react"; |
| 4 | +import defaultTranslations from "@/i18n/translations.en.json"; |
| 5 | +import classes from "@/components/header.module.css"; |
| 6 | + |
| 7 | +const languages = { |
| 8 | + en: "English", |
| 9 | + es: "Español", |
| 10 | + // ... |
| 11 | +}; |
| 12 | + |
| 13 | +type TranslationObject = { |
| 14 | + [key: string]: string | TranslationObject; |
| 15 | +}; |
| 16 | + |
| 17 | +interface LanguageSelectorProps { |
| 18 | + className?: string; |
| 19 | +} |
| 20 | + |
| 21 | +async function getAvailableLanguage() { |
| 22 | + const defaultLanguage = "en"; |
| 23 | + const storedLanguage = window.localStorage.getItem("next-export-i18n-lang"); |
| 24 | + const browserLanguage = |
| 25 | + window.navigator.language || |
| 26 | + (window.navigator.languages && window.navigator.languages[0]); |
| 27 | + const language = storedLanguage || browserLanguage || defaultLanguage; |
| 28 | + |
| 29 | + // Helper function to check if a language file exists |
| 30 | + const checkLanguageFileExists = async (lang: string) => { |
| 31 | + try { |
| 32 | + await import(`@/i18n/translations.${lang}.json`); |
| 33 | + return lang; |
| 34 | + } catch { |
| 35 | + console.warn(`Translation file for language "${lang}" not found.`); |
| 36 | + return null; |
| 37 | + } |
| 38 | + }; |
| 39 | + |
| 40 | + // Check for full and base language, then fallback to default language |
| 41 | + const lang = |
| 42 | + (await checkLanguageFileExists(language)) || |
| 43 | + (await checkLanguageFileExists(language.split("-")[0])) || |
| 44 | + defaultLanguage; |
| 45 | + return lang; |
| 46 | +} |
| 47 | + |
| 48 | +const getNestedTranslation = ( |
| 49 | + obj: TranslationObject, |
| 50 | + key: string, |
| 51 | +): string | undefined => { |
| 52 | + let acc: TranslationObject | string | undefined = obj; |
| 53 | + for (let i = 0; i < key.split(".").length; i++) { |
| 54 | + const part = key.split(".")[i]; |
| 55 | + if (acc && typeof acc !== "string" && acc[part] !== undefined) { |
| 56 | + acc = acc[part]; |
| 57 | + } else { |
| 58 | + acc = undefined; // If a part is not found, stop and return undefined |
| 59 | + break; |
| 60 | + } |
| 61 | + } |
| 62 | + return typeof acc === "string" ? acc : undefined; |
| 63 | +}; |
| 64 | + |
| 65 | +async function fetchTranslations(lang: string) { |
| 66 | + try { |
| 67 | + const translations = await import(`@/i18n/translations.${lang}.json`); |
| 68 | + return translations; |
| 69 | + } catch { |
| 70 | + console.warn(`Translation file for language "${lang}" not found.`); |
| 71 | + return null; |
| 72 | + } |
| 73 | +} |
| 74 | + |
| 75 | +export function useTranslation() { |
| 76 | + const [translations, setTranslations] = |
| 77 | + useState<TranslationObject>(defaultTranslations); |
| 78 | + |
| 79 | + useEffect(() => { |
| 80 | + const fetchLanguageAndTranslations = async () => { |
| 81 | + const lang = await getAvailableLanguage(); |
| 82 | + const loadedTranslations = await fetchTranslations(lang); |
| 83 | + setTranslations(loadedTranslations || defaultTranslations); |
| 84 | + }; |
| 85 | + |
| 86 | + fetchLanguageAndTranslations(); |
| 87 | + |
| 88 | + const handleLocalStorageLangChange = () => fetchLanguageAndTranslations(); |
| 89 | + |
| 90 | + window.addEventListener( |
| 91 | + "localStorageLangChange", |
| 92 | + handleLocalStorageLangChange, |
| 93 | + ); |
| 94 | + return () => |
| 95 | + window.removeEventListener( |
| 96 | + "localStorageLangChange", |
| 97 | + handleLocalStorageLangChange, |
| 98 | + ); |
| 99 | + }, []); |
| 100 | + |
| 101 | + const t = useCallback( |
| 102 | + (translationKey: string): string => { |
| 103 | + return ( |
| 104 | + getNestedTranslation(translations, translationKey) || |
| 105 | + getNestedTranslation(defaultTranslations, translationKey) || |
| 106 | + translationKey |
| 107 | + ); |
| 108 | + }, |
| 109 | + [translations], |
| 110 | + ); |
| 111 | + |
| 112 | + return { t }; |
| 113 | +} |
| 114 | + |
| 115 | +export const LanguageSelector: React.FC<LanguageSelectorProps> = ({ |
| 116 | + className, |
| 117 | +}) => { |
| 118 | + const [selectedLang, setSelectedLang] = useState<string>(""); |
| 119 | + |
| 120 | + useEffect(() => { |
| 121 | + // Fetch and set the selected language |
| 122 | + const fetchLanguage = async () => { |
| 123 | + const lang = await getAvailableLanguage(); |
| 124 | + setSelectedLang(lang); |
| 125 | + }; |
| 126 | + |
| 127 | + fetchLanguage(); // Set the language initially |
| 128 | + }, []); |
| 129 | + |
| 130 | + const handleLanguageChange = ( |
| 131 | + event: React.ChangeEvent<HTMLSelectElement>, |
| 132 | + ) => { |
| 133 | + const newLang = event.target.value; |
| 134 | + setSelectedLang(newLang); |
| 135 | + window.localStorage.setItem("next-export-i18n-lang", newLang); |
| 136 | + |
| 137 | + // Dispatch an event to notify other components or contexts of the language change |
| 138 | + const langChangeEvent = new Event("localStorageLangChange"); |
| 139 | + window.dispatchEvent(langChangeEvent); |
| 140 | + }; |
| 141 | + |
| 142 | + return ( |
| 143 | + <select |
| 144 | + className={`${classes.languageSelector} ${className || ""}`} |
| 145 | + value={selectedLang} |
| 146 | + onChange={handleLanguageChange} |
| 147 | + > |
| 148 | + {Object.entries(languages).map(([langCode, langName]) => ( |
| 149 | + <option key={langCode} value={langCode}> |
| 150 | + {langName} |
| 151 | + </option> |
| 152 | + ))} |
| 153 | + </select> |
| 154 | + ); |
| 155 | +}; |
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