import * as fsHelper from '../src/fs-helper'
import * as fs from 'fs'
import * as os from 'os'
import { execSync } from 'child_process'

const fileContent = 'This is the content of the file'

describe('createArchives', () => {
  let tmpDir: string
  let distDir: string

  beforeAll(() => {
    distDir = fsHelper.createTempDir()
    fs.writeFileSync(`${distDir}/hello.txt`, fileContent)
    fs.writeFileSync(`${distDir}/world.txt`, fileContent)
  })

  beforeEach(() => {
    tmpDir = fsHelper.createTempDir()
  })

  afterEach(() => {
    fs.rmSync(tmpDir, { recursive: true })
  })

  afterAll(() => {
    fs.rmSync(distDir, { recursive: true })
  })

  it('creates archives', async () => {
    const { zipFile, tarFile } = await fsHelper.createArchives(distDir, tmpDir)

    expect(zipFile.path).toEqual(`${tmpDir}/archive.zip`)
    expect(fs.existsSync(zipFile.path)).toEqual(true)
    expect(fs.statSync(zipFile.path).size).toBeGreaterThan(0)
    expect(zipFile.sha256.startsWith('sha256:')).toEqual(true)

    expect(tarFile.path).toEqual(`${tmpDir}/archive.tar.gz`)
    expect(fs.existsSync(tarFile.path)).toEqual(true)
    expect(fs.statSync(tarFile.path).size).toBeGreaterThan(0)
    expect(tarFile.sha256.startsWith('sha256:')).toEqual(true)

    // Validate the hashes by comparing to the output of the system's hashing utility
    const zipSHA = zipFile.sha256.substring(7) // remove "sha256:" prefix
    const tarSHA = tarFile.sha256.substring(7) // remove "sha256:" prefix

    // sha256 hash is 64 characters long
    expect(zipSHA).toHaveLength(64)
    expect(tarSHA).toHaveLength(64)

    let systemZipHash: string
    let systemTarHash: string

    if (os.platform() === 'win32') {
      // Windows
      systemZipHash = execSync(`CertUtil -hashfile ${zipFile.path} SHA256`)
        .toString()
        .split(' ')[1]
        .trim()
      systemTarHash = execSync(`CertUtil -hashfile ${tarFile.path} SHA256`)
        .toString()
        .split(' ')[1]
        .trim()
    } else {
      // Unix-based systems
      systemZipHash = execSync(`shasum -a 256 ${zipFile.path}`)
        .toString()
        .split(' ')[0]
      systemTarHash = execSync(`shasum -a 256 ${tarFile.path}`)
        .toString()
        .split(' ')[0]
    }

    expect(zipSHA).toEqual(systemZipHash)
    expect(tarSHA).toEqual(systemTarHash)
  })

  // TODO: Test the failure cases
})

describe('createTempDir', () => {
  let dirs: string[] = []

  beforeEach(() => {
    dirs = []
  })

  afterEach(() => {
    for (const dir of dirs) {
      fs.rmSync(dir, { recursive: true })
    }
  })

  it('creates a temporary directory in the OS temporary dir', () => {
    const tmpDir = fsHelper.createTempDir()
    dirs.push(tmpDir)

    expect(fs.existsSync(tmpDir)).toEqual(true)
    expect(fs.statSync(tmpDir).isDirectory()).toEqual(true)
    expect(tmpDir.startsWith(os.tmpdir())).toEqual(true)
  })

  it('creates a unique temporary directory', () => {
    const dir1 = fsHelper.createTempDir()
    dirs.push(dir1)

    const dir2 = fsHelper.createTempDir()
    dirs.push(dir2)

    expect(dir1).not.toEqual(dir2)
  })
})

describe('isDirectory', () => {
  let dir: string

  beforeEach(() => {
    dir = fsHelper.createTempDir()
  })

  afterEach(() => {
    fs.rmSync(dir, { recursive: true })
  })

  it('returns true if the path is a directory', () => {
    expect(fsHelper.isDirectory(dir)).toEqual(true)
  })

  it('returns false if the path is not a directory', () => {
    const tempFile = `${dir}/file.txt`
    fs.writeFileSync(tempFile, fileContent)
    expect(fsHelper.isDirectory(tempFile)).toEqual(false)
  })
})

describe('readFileContents', () => {
  let dir: string

  beforeEach(() => {
    dir = fsHelper.createTempDir()
  })

  afterEach(() => {
    fs.rmSync(dir, { recursive: true })
  })

  it('reads the contents of a file', () => {
    const tempFile = `${dir}/file.txt`
    fs.writeFileSync(tempFile, fileContent)

    expect(fsHelper.readFileContents(tempFile).toString()).toEqual(fileContent)
  })
})

describe('removeDir', () => {
  let dir: string

  beforeEach(() => {
    dir = fsHelper.createTempDir()
  })

  afterEach(() => {
    if (fs.existsSync(dir)) {
      fs.rmSync(dir, { recursive: true })
    }
  })

  it('removes a directory', () => {
    fsHelper.removeDir(dir)
    expect(fs.existsSync(dir)).toEqual(false)
  })
})