import { i18n } from '/@/locales'

interface I18nGlobalTranslation {
    (key: string): string
    (key: string, locale: string): string
    (key: string, locale: string, list: unknown[]): string
    (key: string, locale: string, named: Record<string, unknown>): string
    (key: string, list: unknown[]): string
    (key: string, named: Record<string, unknown>): string
}

type I18nTranslationRestParameters = [string, any]

function getKey(namespace: string | undefined, key: string) {
    if (!namespace) {
        return key
    }
    if (key.startsWith(namespace)) {
        return key
    }
    return `${namespace}.${key}`
}

export function useI18n(namespace?: string): {
    t: I18nGlobalTranslation
} {
    const normalFn = {
        t: (key: string) => {
            return getKey(namespace, key)
        },
    }

    if (!i18n) {
        return normalFn
    }

    const { t, ...methods } = i18n.global

    const tFn: I18nGlobalTranslation = (key: string, ...arg: any[]) => {
        if (!key) {
            return ''
        }
        if (!key.includes('.') && !namespace) {
            return key
        }
        // @ts-expect-error
        return t(getKey(namespace, key), ...(arg as I18nTranslationRestParameters))
    }
    return {
        ...methods,
        t: tFn,
    }
}

// Why write this function？
// Mainly to configure the vscode i18nn ally plugin. This function is only used for routing and menus. Please use useI18n for other places

// 为什么要编写此函数？
// 主要用于配合vscode i18nn ally插件。此功能仅用于路由和菜单。请在其他地方使用useI18n
export function t(key: string) {
    return key
}
