import type { H3Event } from 'h3'

export interface ReviewRow {
  id: number
  title: string | null
  date: string | null
  author_or_director: string | null
  review: string | null
  medium: SelectOption | null
}

interface SelectOption {
  id: number
  value: string
}

interface Field {
  name: string
  select_options?: SelectOption[]
}

const OPTION_CACHE_MS = 10 * 60_000

let mediumOptions: { ids: Partial<Record<Medium, number>>, fetchedAt: number } | null = null

function toMedium(value: string | undefined): Medium | null {
  return MEDIUM_KEYS.find(medium => MEDIUMS[medium].label === value) ?? null
}

export function toReview(row: ReviewRow): Review {
  return {
    id: row.id,
    date: row.date ?? '',
    title: (row.title ?? '').trim(),
    author: row.author_or_director?.trim() || null,
    text: (row.review ?? '').replace(/&nbsp;/g, ' ').trim(),
    medium: toMedium(row.medium?.value)
  }
}

export async function mediumOptionId(event: H3Event, medium: Medium): Promise<number> {
  if (!mediumOptions || Date.now() - mediumOptions.fetchedAt > OPTION_CACHE_MS) {
    const fields = await listFields<Field>(event, 'reviews')
    const options = fields.find(field => field.name === 'medium')?.select_options ?? []
    const ids: Partial<Record<Medium, number>> = {}
    for (const option of options) {
      const key = toMedium(option.value)
      if (key) ids[key] = option.id
    }
    mediumOptions = { ids, fetchedAt: Date.now() }
  }

  const id = mediumOptions.ids[medium]
  if (!id) {
    throw createError({ statusCode: 500, statusMessage: `The medium field has no "${MEDIUMS[medium].label}" option` })
  }
  return id
}