import { defineNuxtRouteMiddleware, useNuxtApp } from 'nuxt/app';

import { buildPronoun } from '#shared/buildPronoun.ts';
import type { Translator } from '#shared/translator.ts';
import { loadNounsData, loadPronounLibrary } from '~/src/data.ts';
import type { Config } from '~~/locale/config.ts';

const findPronoun = async (path: string, config: Config, translator: Translator) => {
    if (config.pronouns.prefix) {
        if (!path.startsWith(config.pronouns.prefix)) {
            return;
        }
        path = path.substring(config.pronouns.prefix.length);
    }

    const pronounLibrary = await loadPronounLibrary(config);
    const pronouns = pronounLibrary.pronouns;
    return buildPronoun(pronouns, path, config, translator) ?? undefined;
};

const findNounConvention = async (path: string, config: Config) => {
    if (!config.nouns.enabled || !config.nouns.conventions?.enabled) {
        return undefined;
    }

    const nounsData = await loadNounsData();

    return entriesWithKeys(nounsData.conventions ?? {})
        .find((nounConvention) => nounConvention.key === path);
};

export default defineNuxtRouteMiddleware(async (to) => {
    const { $translator: translator } = useNuxtApp();
    const config = useConfig();

    const path = decodeURIComponent(to.path.replaceAll(/^\/|\/$/g, ''));

    to.meta.pronoun = await findPronoun(path, config, translator);
    if (to.meta.pronoun !== undefined) {
        to.meta.headerCategory = 'pronouns';
        return;
    }

    to.meta.nounConvention = await findNounConvention(path, config);
    if (to.meta.nounConvention !== undefined) {
        to.meta.headerCategory = 'nouns';
        return;
    }

    return abortNavigation();
});