// Composables
import { useProxiedModel } from "../../composables/proxiedModel.js"; // Utilities
import { toRef, watch } from 'vue';

// Types

function useProvided(props, prop, provided) {
  const internal = useProxiedModel(props, prop);
  internal.value = props[prop] ?? provided.value;
  watch(provided, v => {
    if (props[prop] == null) {
      internal.value = v;
    }
  });
  return internal;
}
function inferDecimalSeparator(format) {
  return format(0.1).includes(',') ? ',' : '.';
}
function createProvideFunction(data) {
  return props => {
    const current = useProvided(props, 'locale', data.current);
    const fallback = useProvided(props, 'fallback', data.fallback);
    const messages = useProvided(props, 'messages', data.messages);
    const i18n = data.useI18n({
      locale: current.value,
      fallbackLocale: fallback.value,
      messages: messages.value,
      useScope: 'local',
      legacy: false,
      inheritLocale: false
    });
    watch(current, v => {
      i18n.locale.value = v;
    });
    return {
      name: 'vue-i18n',
      current,
      fallback,
      messages,
      decimalSeparator: toRef(() => props.decimalSeparator ?? inferDecimalSeparator(i18n.n)),
      t: (key, ...params) => i18n.t(key, params),
      n: i18n.n,
      provide: createProvideFunction({
        current,
        fallback,
        messages,
        useI18n: data.useI18n
      })
    };
  };
}
export function createVueI18nAdapter({
  i18n,
  useI18n
}) {
  const current = i18n.global.locale;
  const fallback = i18n.global.fallbackLocale;
  const messages = i18n.global.messages;
  return {
    name: 'vue-i18n',
    current,
    fallback,
    messages,
    decimalSeparator: toRef(() => inferDecimalSeparator(i18n.global.n)),
    t: (key, ...params) => i18n.global.t(key, params),
    n: i18n.global.n,
    provide: createProvideFunction({
      current,
      fallback,
      messages,
      useI18n
    })
  };
}
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