import { i18n, type Messages } from "@lingui/core"
import dayjs from "dayjs"
import { useEffect } from "react"
import { useAppSelector } from "@/app/store"

interface Locale {
    key: string
    label: string
    dayjsImportFn: () => Promise<ILocale>
}

// add an object to the array to add a new locale
// don't forget to also add it to the 'locales' array in lingui.config.ts
export const locales: Locale[] = [
    {
        key: "ar",
        label: "العربية",
        dayjsImportFn: async () => await import("dayjs/locale/ar"),
    },
    {
        key: "ca",
        label: "Català",
        dayjsImportFn: async () => await import("dayjs/locale/ca"),
    },
    {
        key: "cs",
        label: "Čeština",
        dayjsImportFn: async () => await import("dayjs/locale/cs"),
    },
    {
        key: "cy",
        label: "Cymraeg",
        dayjsImportFn: async () => await import("dayjs/locale/cy"),
    },
    {
        key: "da",
        label: "Danish",
        dayjsImportFn: async () => await import("dayjs/locale/da"),
    },
    {
        key: "de",
        label: "Deutsch",
        dayjsImportFn: async () => await import("dayjs/locale/de"),
    },
    {
        key: "en",
        label: "English",
        dayjsImportFn: async () => await import("dayjs/locale/en"),
    },
    {
        key: "es",
        label: "Español",
        dayjsImportFn: async () => await import("dayjs/locale/es"),
    },
    {
        key: "fa",
        label: "فارسی",
        dayjsImportFn: async () => await import("dayjs/locale/fa"),
    },
    {
        key: "fi",
        label: "Suomi",
        dayjsImportFn: async () => await import("dayjs/locale/fi"),
    },
    {
        key: "fr",
        label: "Français",
        dayjsImportFn: async () => await import("dayjs/locale/fr"),
    },
    {
        key: "gl",
        label: "Galician",
        dayjsImportFn: async () => await import("dayjs/locale/gl"),
    },
    {
        key: "hu",
        label: "Magyar",
        dayjsImportFn: async () => await import("dayjs/locale/hu"),
    },
    {
        key: "id",
        label: "Indonesian",
        dayjsImportFn: async () => await import("dayjs/locale/id"),
    },
    {
        key: "it",
        label: "Italiano",
        dayjsImportFn: async () => await import("dayjs/locale/it"),
    },
    {
        key: "ja",
        label: "日本語",
        dayjsImportFn: async () => await import("dayjs/locale/ja"),
    },
    {
        key: "ko",
        label: "한국어",
        dayjsImportFn: async () => await import("dayjs/locale/ko"),
    },
    {
        key: "ms",
        label: "Bahasa Malaysian",
        dayjsImportFn: async () => await import("dayjs/locale/ms"),
    },
    {
        key: "nb",
        label: "Norsk (bokmål)",
        dayjsImportFn: async () => await import("dayjs/locale/nb"),
    },
    {
        key: "nl",
        label: "Nederlands",
        dayjsImportFn: async () => await import("dayjs/locale/nl"),
    },
    {
        key: "nn",
        label: "Norsk (nynorsk)",
        dayjsImportFn: async () => await import("dayjs/locale/nn"),
    },
    {
        key: "pl",
        label: "Polski",
        dayjsImportFn: async () => await import("dayjs/locale/pl"),
    },
    {
        key: "pt",
        label: "Português",
        dayjsImportFn: async () => await import("dayjs/locale/pt"),
    },
    {
        key: "ru",
        label: "Русский",
        dayjsImportFn: async () => await import("dayjs/locale/ru"),
    },
    {
        key: "sk",
        label: "Slovenčina",
        dayjsImportFn: async () => await import("dayjs/locale/sk"),
    },
    {
        key: "sv",
        label: "Svenska",
        dayjsImportFn: async () => await import("dayjs/locale/sv"),
    },
    {
        key: "tr",
        label: "Türkçe",
        dayjsImportFn: async () => await import("dayjs/locale/tr"),
    },
    {
        key: "zh",
        label: "简体中文",
        dayjsImportFn: async () => await import("dayjs/locale/zh"),
    },
]

function activateLocale(locale: string) {
    // lingui
    import(`./locales/${locale}/messages.po`).then((data: { messages: Messages }) => {
        i18n.load(locale, data.messages)
        i18n.activate(locale)
    })

    // dayjs
    locales
        .find(l => l.key === locale)
        ?.dayjsImportFn()
        .then(() => dayjs.locale(locale))
}

export const useI18n = () => {
    const locale =
        useAppSelector(state => state.user.settings?.language) ??
        navigator.languages.map(l => l.split("-")[0]).find(l => locales.some(locale => locale.key === l)) ??
        "en"

    useEffect(() => {
        activateLocale(locale)
    }, [locale])
}