// ========= 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 { invalidateAfterUnlink, invalidateAfterWrite } from '../../cache/context.ts'
import type { PathSpec } from '../../types.ts'
import type { S3Accessor } from '../../accessor/s3.ts'
import { enoent } from '../../utils/errors.ts'
import { loadS3Module, rawPathOf, s3Key, withClient } from './_client.ts'
import { exists } from './exists.ts'

export async function rename(accessor: S3Accessor, src: PathSpec, dst: PathSpec): Promise<void> {
  const { CopyObjectCommand, DeleteObjectCommand } = await loadS3Module(accessor.config)
  const srcKey = s3Key(rawPathOf(src), accessor.config)
  const dstKey = s3Key(rawPathOf(dst), accessor.config)
  const { bucket } = accessor.config
  if (srcKey === dstKey) {
    // POSIX rename(2): the same existing file succeeds and performs no
    // other action. Reaching the copy+delete pair below would instead
    // delete the object on any store that accepts the self-copy, and
    // error on the ones that reject it (#150).
    if (!(await exists(accessor, src))) throw enoent(src)
    return
  }
  await withClient(accessor.config, async (client) => {
    await client.send(
      new CopyObjectCommand({
        Bucket: bucket,
        CopySource: `${bucket}/${srcKey}`,
        Key: dstKey,
      }),
    )
    await client.send(new DeleteObjectCommand({ Bucket: bucket, Key: srcKey }))
  })
  await invalidateAfterWrite(dst)
  await invalidateAfterUnlink(src)
}
