// ========= 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'
import type { OPFSAccessor } from '../../accessor/opfs.ts'
import { isNotFound, resolveDirHandle, resolveParentDirHandle } from './utils.ts'

export async function exists(accessor: OPFSAccessor, path: PathSpec): Promise<boolean> {
  const root = accessor.rootHandle
  const virtual = path.mountPath
  if (virtual === '/' || virtual === '') return true
  try {
    const [parentDir, name] = await resolveParentDirHandle(root, virtual, { create: false })
    try {
      await parentDir.getFileHandle(name, { create: false })
      return true
    } catch (err) {
      if (!isNotFound(err) && !(err instanceof DOMException && err.name === 'TypeMismatchError')) {
        throw err
      }
    }
    try {
      await parentDir.getDirectoryHandle(name, { create: false })
      return true
    } catch (err) {
      if (isNotFound(err) || (err instanceof DOMException && err.name === 'TypeMismatchError')) {
        return false
      }
      throw err
    }
  } catch (err) {
    if (isNotFound(err)) return false
    if (err instanceof Error && err.message.startsWith('path escapes root')) return false
    if (err instanceof Error && err.message.startsWith('no parent directory')) {
      try {
        await resolveDirHandle(root, virtual, { create: false })
        return true
      } catch {
        return false
      }
    }
    throw err
  }
}
