// The layer's local Nuxt module (configKey `journal`). It registers the
// Journal page components at the paths in journal.routes, so an app moves or
// disables a view in its own nuxt.config without copying page files. It lives
// in lib/ rather than modules/ so Nuxt's local-module scan cannot register it
// a second time. Layer source never uses the ~ or @ aliases: they resolve to
// the consuming project.

import { fileURLToPath } from 'node:url'
import { defineNuxtModule, extendPages } from 'nuxt/kit'
import { DEFAULT_JOURNAL_ROUTES, JOURNAL_ROUTE_NAMES, normalizeJournalRoutes } from '../app/utils/routes.ts'
import type { JournalModuleOptions, JournalRoutes } from '../app/utils/types.ts'

const PAGE_FILES: Record<keyof JournalRoutes, string> = {
  index: 'PostIndexPage',
  post: 'PostPage',
  category: 'CategoryPage',
  tag: 'TagPage',
  author: 'AuthorPage',
}

const pagesDir = fileURLToPath(new URL('../app/journal-pages/', import.meta.url))
const langDir = fileURLToPath(new URL('../i18n/locales/', import.meta.url))

/** UI string locales the layer ships, each in i18n/locales/<code>.json. */
const LAYER_LOCALES = ['pl', 'en'] as const

/** Locale codes the project enables in its i18n config (strings or objects). */
function enabledLocaleCodes(locales: unknown): string[] {
  if (!Array.isArray(locales)) return []
  return locales
    .map((l) => (typeof l === 'string' ? l : l && typeof l === 'object' ? (l as { code?: unknown }).code : undefined))
    .filter((c): c is string => typeof c === 'string')
}

export default defineNuxtModule<JournalModuleOptions>({
  meta: {
    name: 'vue-journal-layer',
    configKey: 'journal',
  },
  defaults: {
    routes: { ...DEFAULT_JOURNAL_ROUTES },
    perPage: { index: 9, category: 9, tag: 9, author: 9 },
    sort: 'published_at desc',
    relatedCount: 3,
    rss: true,
  },
  setup(options, nuxt) {
    const routes = normalizeJournalRoutes(options.routes as unknown as Record<string, unknown>)

    extendPages((pages) => {
      for (const key of Object.keys(PAGE_FILES) as Array<keyof JournalRoutes>) {
        const path = routes[key]
        if (path === false) continue
        pages.push({ name: JOURNAL_ROUTE_NAMES[key], path, file: `${pagesDir}${PAGE_FILES[key]}.vue` })
      }
    })

    // Register the layer's strings only for locales the app enables. The
    // layer config declares no locales: @nuxtjs/i18n merges every locale a
    // layer declares into the app, which would add /en routes to an app that
    // enables only pl.
    const hook = nuxt.hook as unknown as (
      name: 'i18n:registerModule',
      fn: (register: (config: { langDir: string; locales: Array<{ code: string; file: string }> }) => void) => void,
    ) => void
    hook('i18n:registerModule', (register) => {
      const enabled = enabledLocaleCodes((nuxt.options as { i18n?: { locales?: unknown } }).i18n?.locales)
      const locales = LAYER_LOCALES.filter((code) => enabled.includes(code)).map((code) => ({ code, file: `${code}.json` }))
      if (locales.length > 0) register({ langDir, locales })
    })

    // The public runtime config carries the resolved options next to apiBase,
    // so pages, links and the sitemap source read one source of truth.
    const pub = nuxt.options.runtimeConfig.public as Record<string, any>
    pub.journal = {
      ...(pub.journal ?? {}),
      routes,
      perPage: { ...options.perPage },
      sort: options.sort,
      relatedCount: options.relatedCount,
      rss: options.rss,
    }
  },
})