/*
 * Copyright (C) 2026 - present Instructure, Inc.
 *
 * This file is part of Canvas.
 *
 * Canvas is free software: you can redistribute it and/or modify it under
 * the terms of the GNU Affero General Public License as published by the Free
 * Software Foundation, version 3 of the License.
 *
 * Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 * A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
 * details.
 *
 * You should have received a copy of the GNU Affero General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */

import {CC_FILE_MAX_BYTES} from '../../../shared/constants'
import {defaultClosedCaptionPanelTranslations} from '../../translations'
import {validateCaptionFile} from '../validation'

function fileOfSize(name: string, size: number): File {
  return new File([new ArrayBuffer(size)], name)
}

describe('validateCaptionFile', () => {
  it('accepts a .vtt file within the size limit', () => {
    expect(validateCaptionFile(fileOfSize('captions.vtt', 100))).toEqual({valid: true})
  })

  it('accepts a .srt file within the size limit', () => {
    expect(validateCaptionFile(fileOfSize('captions.srt', 100))).toEqual({valid: true})
  })

  it('rejects a file over the size limit using the default English message', () => {
    const result = validateCaptionFile(fileOfSize('captions.vtt', CC_FILE_MAX_BYTES + 1))
    expect(result).toEqual({
      valid: false,
      error: `The selected file exceeds the ${CC_FILE_MAX_BYTES} Byte limit`,
    })
  })

  it('rejects a file with an unsupported extension using the default English message', () => {
    const result = validateCaptionFile(fileOfSize('captions.txt', 100))
    expect(result).toEqual({valid: false, error: 'Please select a .vtt or .srt file'})
  })

  it('routes both error messages through a custom translations object', () => {
    const customTranslations = {
      ...defaultClosedCaptionPanelTranslations,
      fileSizeExceeded: ({maxSize}: {maxSize: number}) => `CUSTOM_TOO_BIG_${maxSize}`,
      invalidFileType: () => 'CUSTOM_BAD_TYPE',
    }

    expect(
      validateCaptionFile(fileOfSize('captions.vtt', CC_FILE_MAX_BYTES + 1), customTranslations)
        .error,
    ).toEqual(`CUSTOM_TOO_BIG_${CC_FILE_MAX_BYTES}`)

    expect(validateCaptionFile(fileOfSize('captions.txt', 100), customTranslations).error).toEqual(
      'CUSTOM_BAD_TYPE',
    )
  })
})