// The labels each component takes, built from a message lookup. Every key this module's pages use
// is named here and nowhere else, so `__tests__/i18n.test.ts` can run these builders against the
// catalogues and fail on a key either language lacks.

import { KNOWLEDGE_REFUSALS, type KnowledgeRefusal } from "../contract/index.js"

export type Translate = (key: string, values?: Record<string, string | number>) => string

/** A typed refusal as a page or a form shows it. */
export interface RefusalNotice {
  readonly code: KnowledgeRefusal
  readonly text: string
}

export type RefusalLabels = Readonly<Record<KnowledgeRefusal, string>>

export const refusalLabels = (t: Translate): RefusalLabels =>
  Object.fromEntries(KNOWLEDGE_REFUSALS.map((code) => [code, t(`refusals.${code}`)])) as RefusalLabels

/** The typed refusal a procedure answered, or undefined for any other error (which the form words itself). */
export function refusalOf(labels: RefusalLabels, error: unknown): RefusalNotice | undefined {
  const code = (error as { problem?: { code?: unknown } } | null)?.problem?.code
  return typeof code === "string" && code in labels
    ? { code: code as KnowledgeRefusal, text: labels[code as KnowledgeRefusal] }
    : undefined
}

/** The words for a failure a document row records: the file's own, or the service's refusal; else the code. */
export function failureText(t: Translate, code: string): string {
  return failureLabels(t)[code] ?? code
}

/** The failures a document row can name with words of their own: the file's, and the service's refusals. */
const FILE_FAILURES = ["file_changed", "not_text", "not_indexable", "too_large"] as const

/** The words of each failure `failureText` knows, by code, for a page that words a live row in the browser. */
export const failureLabels = (t: Translate): Readonly<Record<string, string>> =>
  Object.fromEntries([
    ...KNOWLEDGE_REFUSALS.map((code) => [code, t(`refusals.${code}`)]),
    ...FILE_FAILURES.map((code) => [code, t(`failures.${code}`)]),
  ])

/** The status shape the labels render, declared here: ui reads no core/. */
interface StatusCounts {
  documents: { queued: number; indexing: number; indexed: number; failed: number; cancelled: number }
}

export interface StatusLabels {
  readonly heading: string
  readonly flagOff: string
  readonly state: string
  readonly reasons: string
  readonly indexing: string
  readonly documents: string
}

export function statusLabels(t: Translate, status: StatusCounts): StatusLabels {
  return {
    heading: t("status.heading"),
    flagOff: t("status.flagOff"),
    state: t("status.state"),
    reasons: t("status.reasons"),
    indexing: t("status.indexing"),
    documents: t("status.documents", status.documents),
  }
}

export const serviceStateLabel = (t: Translate, state: string): string => {
  switch (state) {
    case "ready":
      return t("status.stateReady")
    case "indexing":
      return t("status.stateIndexing")
    case "registered":
      return t("status.stateRegistered")
    case "degraded":
      return t("status.stateDegraded")
    case "disabled":
      return t("status.stateDisabled")
    default:
      return t("status.stateUnavailable")
  }
}

export interface SearchFormLabels {
  readonly heading: string
  readonly label: string
  readonly placeholder: string
  readonly submit: string
  readonly busy: string
  readonly empty: string
  readonly results: string
  readonly snippet: string
  readonly source: string
  readonly chunk: string
  readonly page: string
  readonly disclosure: string
  readonly refusals: RefusalLabels
}

export function searchFormLabels(t: Translate): SearchFormLabels {
  return {
    heading: t("search.heading"),
    label: t("search.label"),
    placeholder: t("search.placeholder"),
    submit: t("search.submit"),
    busy: t("search.busy"),
    empty: t("search.empty"),
    // Not filled in here: only the browser knows the count, and `formatMessage` brings the plural rules.
    results: t("search.results"),
    snippet: t("search.snippet"),
    source: t("search.source"),
    chunk: t("search.chunk", { chunk: "{chunk}" }),
    page: t("search.page", { page: "{page}" }),
    disclosure: t("search.disclosure"),
    refusals: refusalLabels(t),
  }
}