import type { H3Event } from 'h3'

interface SelectValue {
  value: string
}

interface FileValue {
  url: string
  visible_name: string
}

export interface CvRow {
  id: number
  From: string | null
  To: string | null
  Type: SelectValue | null
  Institution: string | null
  Area: string | null
  area_german?: string | null
  Place: SelectValue | null
  Grade: string | null
  file?: FileValue[] | null
  urls?: string | null
}

export function cvTable(event: H3Event): string {
  const { baserowCvTableId } = useRuntimeConfig(event)
  if (!baserowCvTableId) {
    throw createError({ statusCode: 500, statusMessage: 'NUXT_BASEROW_CV_TABLE_ID is not set' })
  }
  return baserowCvTableId
}

/** Baserow hands out file URLs with its internal protocol (http); serve them from the configured Baserow URL instead */
function fileUrl(url: string, baserowUrl: string): string {
  const { pathname } = new URL(url)
  return new URL(pathname, baserowUrl).href
}

function toCvLink(line: string): CvLink | null {
  // "https://…", or "Label https://…" for custom link text
  const match = line.match(/^(.*?)[\s:|–-]*(https?:\/\/\S+)$/)
  if (!match) return null
  let url: URL
  try {
    url = new URL(match[2]!)
  } catch {
    return null
  }
  const path = url.pathname.replace(/\/+$/, '')
  const kind = url.hostname === 'github.com' ? 'github' : 'web'
  const fallback = kind === 'github' ? path.slice(1) : url.hostname + path
  return { label: match[1]!.trim() || fallback, url: url.href, kind }
}

/** One URL per line; a blank line starts a new group */
function toCvLinks(text: string | null | undefined): CvLink[][] {
  return (text ?? '')
    .split(/\n\s*\n/)
    .map(block => block.split('\n').map(line => toCvLink(line.trim())).filter((link): link is CvLink => !!link))
    .filter(group => group.length)
}

export function toCvEntry(row: CvRow, baserowUrl: string): CvEntry | null {
  if (!row.From) return null
  return {
    id: row.id,
    from: row.From,
    to: row.To || null,
    type: (row.Type?.value as CvType | undefined) ?? null,
    institution: (row.Institution ?? '').trim(),
    area: (row.Area ?? '').trim(),
    areaGerman: (row.area_german ?? '').trim(),
    place: row.Place?.value ?? null,
    grade: row.Grade ?? null,
    files: (row.file ?? []).map(file => ({ name: file.visible_name, url: fileUrl(file.url, baserowUrl) })),
    links: toCvLinks(row.urls)
  }
}