// ========= 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 { describe, expect, it } from 'vitest'
import { materialize } from '../../../io/types.ts'
import { RAMResource } from '../../../resource/ram/ram.ts'
import { PathSpec } from '../../../types.ts'
import { RAM_CSPLIT } from './csplit.ts'

const ENC = new TextEncoder()
const DEC = new TextDecoder()

async function runCsplit(
  resource: RAMResource,
  paths: PathSpec[],
  texts: string[],
  flags: Record<string, string | boolean> = {},
): Promise<{ out: string; exitCode: number }> {
  const cmd = RAM_CSPLIT[0]
  if (cmd === undefined) throw new Error('csplit not registered')
  const result = await cmd.fn(
    (resource as { accessor?: unknown }).accessor as never,
    paths,
    texts,
    {
      stdin: null,
      flags,
      filetypeFns: null,
      cwd: '/',
      resource,
    },
  )
  if (result === null) return { out: '', exitCode: -1 }
  const [out, ioResult] = result
  const buf =
    out === null
      ? new Uint8Array()
      : out instanceof Uint8Array
        ? out
        : await materialize(out as AsyncIterable<Uint8Array>)
  return { out: DEC.decode(buf), exitCode: ioResult.exitCode }
}

describe('csplit', () => {
  it('splits by line number pattern', async () => {
    const resource = new RAMResource()
    resource.store.files.set('/f.txt', ENC.encode('a\nb\nc\nd\n'))
    const r = await runCsplit(resource, [PathSpec.fromStrPath('/f.txt')], ['3'])
    expect(r.exitCode).toBe(0)
    const xx00 = resource.store.files.get('/xx00')
    const xx01 = resource.store.files.get('/xx01')
    expect(xx00).toBeDefined()
    expect(xx01).toBeDefined()
    expect(DEC.decode(xx00)).toBe('a\nb\n')
    expect(DEC.decode(xx01)).toBe('c\nd\n')
  })
})
