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import { statSync, createReadStream, promises as fs } from 'node:fs'
import { basename } from 'node:path'
import DOMException from 'node-domexception'

import File from './file.js'
import Blob from './index.js'

const { stat } = fs

/**
 * @param {string} path filepath on the disk
 * @param {string} [type] mimetype to use
 */
const blobFromSync = (path, type) => fromBlob(statSync(path), path, type)

/**
 * @param {string} path filepath on the disk
 * @param {string} [type] mimetype to use
 * @returns {Promise<Blob>}
 */
const blobFrom = (path, type) => stat(path).then(stat => fromBlob(stat, path, type))

/**
 * @param {string} path filepath on the disk
 * @param {string} [type] mimetype to use
 * @returns {Promise<File>}
 */
const fileFrom = (path, type) => stat(path).then(stat => fromFile(stat, path, type))

/**
 * @param {string} path filepath on the disk
 * @param {string} [type] mimetype to use
 */
const fileFromSync = (path, type) => fromFile(statSync(path), path, type)

// @ts-ignore
const fromBlob = (stat, path, type = '') => new Blob([new BlobDataItem({
  path,
  size: stat.size,
  lastModified: stat.mtimeMs,
  start: 0
})], { type })

// @ts-ignore
const fromFile = (stat, path, type = '') => new File([new BlobDataItem({
  path,
  size: stat.size,
  lastModified: stat.mtimeMs,
  start: 0
})], basename(path), { type, lastModified: stat.mtimeMs })

/**
 * This is a blob backed up by a file on the disk
 * with minium requirement. Its wrapped around a Blob as a blobPart
 * so you have no direct access to this.
 *
 * @private
 */
class BlobDataItem {
  #path
  #start

constructor (options) {
    this.#path = options.path
    this.#start = options.start
    this.size = options.size
    this.lastModified = options.lastModified
  }

/**
   * Slicing arguments is first validated and formatted
   * to not be out of range by Blob.prototype.slice
   */
  slice (start, end) {
    return new BlobDataItem({
      path: this.#path,
      lastModified: this.lastModified,
      size: end - start,
      start: this.#start + start
    })
  }

async * stream () {
    const { mtimeMs } = await stat(this.#path)
    if (mtimeMs > this.lastModified) {
      throw new DOMException('The requested file could not be read, typically due to permission problems that have occurred after a reference to a file was acquired.', 'NotReadableError')
    }
    yield * createReadStream(this.#path, {
      start: this.#start,
      end: this.#start + this.size - 1
    })
  }

get [Symbol.toStringTag] () {
    return 'Blob'
  }
}

export default blobFromSync
export { File, Blob, blobFrom, blobFromSync, fileFrom, fileFromSync }

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Name	Size	Perms	Modified	Actions
file.d.ts	102 B	lrw-rw-r--	1985-10-26 08:15:00	Edit Download recursive recursive
file.js	1.20 KB	lrw-rw-r--	1985-10-26 08:15:00	Edit Download recursive recursive
from.d.ts	819 B	lrw-rw-r--	1985-10-26 08:15:00	Edit Download recursive recursive
from.js	2.59 KB	lrw-rw-r--	1985-10-26 08:15:00	Edit Download recursive recursive
index.d.ts	102 B	lrw-rw-r--	1985-10-26 08:15:00	Edit Download recursive recursive
index.js	7.26 KB	lrw-rw-r--	1985-10-26 08:15:00	Edit Download recursive recursive
LICENSE	1.04 KB	lrw-rw-r--	1985-10-26 08:15:00	Edit Download recursive recursive
package.json	2.35 KB	lrw-rw-r--	2024-06-20 05:50:21	Edit Download recursive recursive
README.md	4.99 KB	lrw-rw-r--	1985-10-26 08:15:00	Edit Download recursive recursive
streams.cjs	1.57 KB	lrw-rw-r--	1985-10-26 08:15:00	Edit Download recursive recursive

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