// ========= Copyright 2026 @ Strukto.AI All Rights Reserved. =========
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ========= Copyright 2026 @ Strukto.AI All Rights Reserved. =========

import type { PathSpec } from '@struktoai/mirage-core/types'
import { enoent } from '@struktoai/mirage-core/utils/errors'
import type { OPFSAccessor } from '../../accessor/opfs.ts'
import { destError, isNotFound, resolveFileHandle, toWritableChunk } from './utils.ts'

export async function copy(accessor: OPFSAccessor, src: PathSpec, dst: PathSpec): Promise<void> {
  const root = accessor.rootHandle
  let srcHandle: FileSystemFileHandle
  try {
    srcHandle = await resolveFileHandle(root, src.mountPath, { create: false })
  } catch (err) {
    if (isNotFound(err)) throw enoent(src)
    throw err
  }
  const file = await srcHandle.getFile()
  const data = new Uint8Array(await file.arrayBuffer())
  let dstHandle: FileSystemFileHandle
  try {
    dstHandle = await resolveFileHandle(root, dst.mountPath, { create: true })
  } catch (err) {
    throw destError(err, dst)
  }
  const writable = await dstHandle.createWritable()
  await writable.write(toWritableChunk(data))
  await writable.close()
}
