import { APP_API_BASE_URL } from '../../api/client'
import { RECORD_VIEW_APP_ID, isDateType, toISODate } from '../../api/recordView'
import { formatDate } from '../../utils/format'

const ISO_DATE = /^\d{4}-\d{2}-\d{2}(T|\s|$)/
const EMAIL = /^[^\s@]+@[^\s@]+\.[^\s@]+$/
const IMAGE_URL = /^https?:\/\/\S+\.(png|jpe?g|gif|webp|svg)(\?\S*)?$/i

const isImageSrc = (s) => typeof s === 'string' && (IMAGE_URL.test(s.trim()) || s.startsWith('data:image/'))

/**
 * A viewable URL for an uploaded file object ({ uuid, blob_path, … }), built
 * the way the Zino app does. Both preview routes are public, so they work as
 * a plain <img src>:
 *   GET {APP_API_BASE_URL}/app/{APP_ID}/view/files/{uuid}/preview
 *   GET {APP_API_BASE_URL}/app/{APP_ID}/view/files/preview?path=<blob_path>
 */
export function fileUrl(file) {
  if (!file || typeof file !== 'object') return null
  if (file.preview_url) return file.preview_url
  const base = `${APP_API_BASE_URL}/app/${RECORD_VIEW_APP_ID}/view/files`
  const uuid = file.uuid || file.repo_file_uuid
  if (uuid) return `${base}/${encodeURIComponent(uuid)}/preview`
  if (file.blob_path) return `${base}/preview?path=${encodeURIComponent(file.blob_path)}`
  return file.url || null
}

/** Parse a value that may arrive as JSON text ('[{…}]', '{…}'). */
function parseJson(v) {
  if (typeof v !== 'string' || !/^[[{]/.test(v.trim())) return v
  try {
    return JSON.parse(v)
  } catch {
    return v
  }
}

/**
 * The image sources in an image value: one URL or uploaded file object, a
 * list of them (photo slots), or that list as JSON text.
 */
export function imageSources(value) {
  const v = parseJson(value)
  return toList(v)
    .map(parseJson)
    .flatMap(toList)
    .map((s) => (typeof s === 'string' ? s.trim() : fileUrl(s)))
    .filter(Boolean)
}

/** The documents in a file value: [{ url, name }], from file objects or URLs. */
export function fileLinks(value) {
  return toList(parseJson(value))
    .map(parseJson)
    .flatMap(toList)
    .map((f) =>
      typeof f === 'string'
        ? { url: f.trim(), name: f.trim().split('/').pop() }
        : { url: fileUrl(f), name: f?.original_name || 'File' },
    )
    .filter((f) => f.url)
}

/** Links that open each document in a new tab. Clicks don't reach a clickable table row. */
export function FileLinks({ value, label }) {
  const links = fileLinks(value)
  if (!links.length) return <span className="cell-muted">—</span>
  return (
    <span className="file-links">
      {links.map((f, i) => (
        <a
          key={i}
          className="link"
          href={f.url}
          target="_blank"
          rel="noreferrer"
          title={f.name}
          onClick={(e) => e.stopPropagation()}
        >
          📄 {label ?? f.name}
        </a>
      ))}
    </span>
  )
}

const isFile = (o) => ['uuid', 'repo_file_uuid', 'blob_path', 'preview_url', 'url'].some((k) => o[k])

/** A list as-is; photo slots ({ Front: {…}, Other: [...] }) as their photos; else one item. */
function toList(v) {
  if (Array.isArray(v)) return v
  if (v && typeof v === 'object' && !isFile(v)) return Object.values(v).flat()
  return [v]
}

/**
 * Renders one detail field ({ value, type, slots?, otherSlot? }) by its type,
 * falling back to what the value looks like. Shared by every details page.
 * `slots` names the photos of an image list (Front, Back…), in order; any
 * photos past them are named `otherSlot`.
 */
export default function FieldValue({ field }) {
  const { value, type, slots, otherSlot } = field
  const caption = (i) => (slots ? slots[i] ?? otherSlot : undefined)
  if (value === undefined || value === null || value === '') {
    return <span className="cell-muted">—</span>
  }
  const s = typeof value === 'string' ? value.trim() : value

  if (type === 'file') return <FileLinks value={s} />

  const images = type === 'image' || isImageSrc(s) || (Array.isArray(s) && s.every(isImageSrc))
  if (images) {
    return (
      <div className="record-thumbs">
        {imageSources(s).map((src, i) => (
          <figure key={i} className="record-thumbs__item">
            <img className="record-thumb" src={src} alt={caption(i) ?? ''} loading="lazy" />
            {caption(i) && <figcaption>{caption(i)}</figcaption>}
          </figure>
        ))}
      </div>
    )
  }
  if (isDateType(type) || (typeof s === 'string' && ISO_DATE.test(s))) {
    return formatDate(toISODate(s))
  }
  if (type === 'email' || (typeof s === 'string' && EMAIL.test(s))) {
    return <a className="link" href={`mailto:${s}`}>{s}</a>
  }
  if (typeof s === 'boolean') return s ? 'Yes' : 'No'
  if (type === 'geolocation' && typeof s === 'object') {
    const lat = s.lat ?? s.latitude
    const lng = s.lng ?? s.lon ?? s.longitude
    if (lat != null && lng != null) return `${lat}, ${lng}`
  }
  if (Array.isArray(s) && s.every((v) => typeof v !== 'object')) return s.join(', ')
  if (typeof s === 'object') return <span className="cell-muted">{JSON.stringify(s)}</span>
  return String(s)
}

/** Timestamps read as dates; everything else as-is. */
export function formatMeta(value) {
  const s = String(value)
  return ISO_DATE.test(s) ? `${formatDate(toISODate(s))}${s.length > 10 ? ` ${s.slice(11, 16)}` : ''}` : s
}