# Verification helper: append a synthetic assistant line to a JSONL under one
# of the resolved roots, so the watcher/poll can be exercised without running
# a real Claude Code session.
#
# Usage (from PowerShell on the Windows host):
#   .\scripts\seed-fake-jsonl.ps1
#   .\scripts\seed-fake-jsonl.ps1 -InputTokens 5000 -OutputTokens 1500 -Model claude-sonnet-4-6
#   .\scripts\seed-fake-jsonl.ps1 -OffsetHours -6     # back-date by 6h to test block boundary

[CmdletBinding()]
param(
  [string] $Distro = $null,                              # null → first distro found
  [string] $Model = "claude-opus-4-7",
  [int]    $InputTokens = 100,
  [int]    $OutputTokens = 500,
  [int]    $CacheCreate = 0,
  [int]    $CacheRead = 0,
  [double] $OffsetHours = 0,                             # back/forward date the timestamp
  [string] $Path = $null                                 # explicit JSONL path; overrides discovery
)

function Find-RootJsonl {
  param([string] $Distro)

  if ($Path) { return $Path }

  $candidates = @()

  # Native first.
  $native = Join-Path $env:USERPROFILE ".claude\projects"
  if (Test-Path $native) { $candidates += $native }

  # WSL.
  if (-not $Distro) {
    $distros = (& wsl.exe -l -q) | Where-Object { $_ -and $_.Trim() }
    if ($distros) { $Distro = $distros[0].Trim() }
  }
  if ($Distro) {
    $homeDir = "\\wsl$\$Distro\home"
    if (Test-Path $homeDir) {
      Get-ChildItem $homeDir -Directory | ForEach-Object {
        $p = Join-Path $_.FullName ".claude\projects"
        if (Test-Path $p) { $candidates += $p }
      }
    }
  }

  if (-not $candidates) { throw "No .claude/projects found (native or WSL)." }

  $root = $candidates[0]
  Write-Host "Using root: $root"

  # Use a dedicated synthetic project dir so we don't pollute real transcripts.
  $project = Join-Path $root "-fake-claude-usage-widget"
  New-Item -ItemType Directory -Force -Path $project | Out-Null
  return Join-Path $project "synthetic.jsonl"
}

$target = Find-RootJsonl -Distro $Distro
$ts = (Get-Date).ToUniversalTime().AddHours($OffsetHours).ToString("o")
$uuid = [guid]::NewGuid().ToString()
$reqId = "req_" + ([guid]::NewGuid().ToString("N").Substring(0, 16))

$line = @{
  type = "assistant"
  timestamp = $ts
  sessionId = $uuid
  requestId = $reqId
  uuid = $uuid
  message = @{
    model = $Model
    usage = @{
      input_tokens = $InputTokens
      output_tokens = $OutputTokens
      cache_creation_input_tokens = $CacheCreate
      cache_read_input_tokens = $CacheRead
    }
  }
} | ConvertTo-Json -Compress -Depth 6

Add-Content -Path $target -Value $line -Encoding UTF8
Write-Host "Appended to $target"
Write-Host $line