import { type Nip94Tags, readNip94Tags } from "./nip94"

/**
 * https://github.com/nostr-protocol/nips/blob/master/92.md impl
 */
export class Nip92 {
  /**
   * Read NIP-94 tags from `imeta` tag
   */
  static parse(tag: Array<string>) {
    return readNip94TagsFromIMeta(tag)
  }

  /**
   * Read NIP-94 tags from all `imeta` tags
   */
  static parseAll(tags: Array<Array<string>>) {
    const iMetaTags = tags.filter(a => a[0] === "imeta")
    return iMetaTags.map(a => Nip92.parse(a))
  }
}

/**
 * Read NIP-94 tags from `imeta` tag
 */
export function readNip94TagsFromIMeta(tag: Array<string>) {
  if (tag.length < 2) {
    throw new Error("Invalid tag, must have more than 1 string")
  }
  const asTags = tag.slice(1).map(a => a.split(" ", 2))
  return readNip94Tags(asTags)
}

export function nip94TagsToIMeta(meta: Nip94Tags) {
  if (!meta.url) {
    throw new Error("URL is required!")
  }
  const ret: Array<string> = ["imeta"]
  const ifPush = (key: string, value?: string | number) => {
    if (value) {
      ret.push(`${key} ${value}`)
    }
  }
  ifPush("url", meta.url)
  ifPush("m", meta.mimeType)
  ifPush("x", meta.hash)
  ifPush("ox", meta.originalHash)
  ifPush("size", meta.size)
  ifPush("dim", meta.dimensions?.join("x"))
  ifPush("magnet", meta.magnet)
  ifPush("blurhash", meta.blurHash)
  ifPush("thumb", meta.thumb)
  ifPush("summary", meta.summary)
  ifPush("alt", meta.alt)
  ifPush("duration", meta.duration)
  ifPush("bitrate", meta.bitrate)
  if (meta.image) {
    meta.image.forEach(a => ifPush("image", a))
  }
  if (meta.fallback) {
    meta.fallback.forEach(a => ifPush("fallback", a))
  }

  return ret
}