param(
    [switch]$Elevated,
    [string]$ResultFile
)

$ErrorActionPreference = 'Stop'
$repo = [System.IO.Path]::GetFullPath((Join-Path $PSScriptRoot '..'))

function Test-IsAdministrator {
    $identity = [Security.Principal.WindowsIdentity]::GetCurrent()
    $principal = New-Object Security.Principal.WindowsPrincipal($identity)
    return $principal.IsInRole([Security.Principal.WindowsBuiltInRole]::Administrator)
}

function New-SmokeSource([string]$Kind) {
    switch ($Kind) {
        'mft' {
@'
package main

import (
  "fmt"
  "io"

  "b612.me/wincmd/ntfs/mft"
)

func main() {
  r, n, err := mft.GetMFTFileReader(`C:\`)
  if err != nil {
    panic(err)
  }
  defer r.Close()

  buf := make([]byte, 1024)
  got, err := io.ReadFull(r, buf)
  if err != nil && err != io.ErrUnexpectedEOF {
    panic(err)
  }

  fmt.Printf("mft_length=%d\n", n)
  fmt.Printf("mft_first_read=%d\n", got)
  fmt.Printf("mft_sig=%x\n", buf[:4])
}
'@
        }
        'usn' {
@'
package main

import (
  "fmt"
  "os"
  "path/filepath"
  "syscall"

  "b612.me/wincmd/ntfs/usn"
  "b612.me/win32api"
)

func main() {
  dir, err := os.MkdirTemp("", "wincmd-usn-admin-")
  if err != nil { panic(err) }
  defer os.RemoveAll(dir)

  path := filepath.Join(dir, "admin-usn.txt")
  if err := os.WriteFile(path, []byte("admin smoke"), 0600); err != nil { panic(err) }

  f, err := os.Open(path)
  if err != nil { panic(err) }
  defer f.Close()

  var info syscall.ByHandleFileInformation
  if err := syscall.GetFileInformationByHandle(syscall.Handle(f.Fd()), &info); err != nil { panic(err) }

  vol := filepath.VolumeName(path) + `\`
  vh, err := usn.CreateFile(`\\.\`+vol[:len(vol)-1], syscall.O_RDONLY, win32api.FILE_ATTRIBUTE_NORMAL)
  if err != nil { panic(err) }
  defer syscall.Close(vh)

  id := win32api.DWORDLONG(uint64(info.FileIndexHigh)<<32 | uint64(info.FileIndexLow))
  fh, err := usn.OpenFileByIdWithfd(vh, id, syscall.O_RDONLY, win32api.FILE_ATTRIBUTE_NORMAL)
  if err != nil { panic(err) }
  defer syscall.Close(fh)

  var info2 syscall.ByHandleFileInformation
  if err := syscall.GetFileInformationByHandle(fh, &info2); err != nil { panic(err) }

  fmt.Printf("usn_id_ok=true\n")
  fmt.Printf("usn_idx_hi=%d\n", info2.FileIndexHigh)
  fmt.Printf("usn_idx_lo=%d\n", info2.FileIndexLow)
}
'@
        }
        default {
            throw "unknown smoke source kind: $Kind"
        }
    }
}

function Invoke-GoSmoke([string]$Kind, [System.Collections.Generic.List[string]]$Lines) {
    $tmpGo = Join-Path $env:TEMP ("wincmd_ntfs_{0}_smoke.go" -f $Kind)
    try {
        Set-Content -Path $tmpGo -Value (New-SmokeSource $Kind) -Encoding utf8
        $output = & go run $tmpGo 2>&1 | Out-String
        $Lines.Add(("{0}_smoke_ok=true" -f $Kind))
        foreach ($line in ($output -split "`r?`n")) {
            if ($line -ne '') {
                $Lines.Add($line)
            }
        }
    } catch {
        $Lines.Add(("{0}_smoke_ok=false" -f $Kind))
        $Lines.Add(("{0}_smoke_err={1}" -f $Kind, $_.Exception.Message))
        throw
    } finally {
        Remove-Item $tmpGo -Force -ErrorAction SilentlyContinue
    }
}

function Write-Result([System.Collections.Generic.List[string]]$Lines, [string]$ResultFilePath) {
    if ($ResultFilePath) {
        Set-Content -Path $ResultFilePath -Value $Lines -Encoding utf8
    } else {
        foreach ($line in $Lines) {
            Write-Output $line
        }
    }
}

if (-not $Elevated -and -not (Test-IsAdministrator)) {
    if (-not $ResultFile) {
        $ResultFile = Join-Path $env:TEMP 'wincmd_ntfs_admin_smoke_result.txt'
    }
    Remove-Item $ResultFile -Force -ErrorAction SilentlyContinue
    $process = Start-Process pwsh.exe -Verb RunAs -ArgumentList '-NoProfile','-ExecutionPolicy','Bypass','-File',$PSCommandPath,'-Elevated','-ResultFile',$ResultFile -PassThru
    $process.WaitForExit()
    if (Test-Path $ResultFile) {
        Get-Content $ResultFile -Encoding utf8
        Remove-Item $ResultFile -Force -ErrorAction SilentlyContinue
    } else {
        Write-Output 'result_file_missing'
    }
    exit $process.ExitCode
}

Set-Location $repo
$lines = New-Object 'System.Collections.Generic.List[string]'
$lines.Add('admin=' + (Test-IsAdministrator))

$failed = $false
try {
    & go test ./ntfs/mft -run '^$' *> $null
    $lines.Add('mft_pkg_ok=true')
} catch {
    $failed = $true
    $lines.Add('mft_pkg_ok=false')
    $lines.Add('mft_pkg_err=' + $_.Exception.Message)
}

try {
    Invoke-GoSmoke -Kind 'mft' -Lines $lines
} catch {
    $failed = $true
}

try {
    Invoke-GoSmoke -Kind 'usn' -Lines $lines
} catch {
    $failed = $true
}

Write-Result -Lines $lines -ResultFilePath $ResultFile

if ($failed) {
    exit 1
}