param(
  [string]$OutputPng = (Join-Path $PSScriptRoot '..\public\assets\sample-pet-depth.png'),
  [string]$OutputJson = (Join-Path $PSScriptRoot '..\public\assets\sample-pet-depth.json')
)

# Hand-authored procedural fixture for local parallax tests.
# Depth convention: 0 = far/background, 1 = near/foreground.
# These values are visual approximations, not AI estimates or measurements.
Add-Type -AssemblyName System.Drawing

$width = 415
$height = 739
$background = 0.08

$landmarks = @(
  [pscustomobject]@{ name = 'nose'; x = 235; y = 310; depth = 0.98; rx = 23; ry = 18 },
  [pscustomobject]@{ name = 'left-eye'; x = 198; y = 278; depth = 0.68; rx = 27; ry = 21 },
  [pscustomobject]@{ name = 'right-eye'; x = 249; y = 273; depth = 0.68; rx = 27; ry = 21 },
  [pscustomobject]@{ name = 'face'; x = 221; y = 267; depth = 0.60; rx = 91; ry = 78 },
  [pscustomobject]@{ name = 'left-ear'; x = 158; y = 213; depth = 0.43; rx = 66; ry = 91 },
  [pscustomobject]@{ name = 'right-ear'; x = 262; y = 206; depth = 0.43; rx = 69; ry = 96 },
  [pscustomobject]@{ name = 'body'; x = 139; y = 419; depth = 0.30; rx = 139; ry = 238 },
  [pscustomobject]@{ name = 'muzzle'; x = 224; y = 305; depth = 0.82; rx = 58; ry = 43 }
)

$bitmap = [System.Drawing.Bitmap]::new($width, $height, [System.Drawing.Imaging.PixelFormat]::Format24bppRgb)
try {
  for ($y = 0; $y -lt $height; $y++) {
    for ($x = 0; $x -lt $width; $x++) {
      $value = $background
      foreach ($shape in $landmarks) {
        $dx = ($x - $shape.x) / [double]$shape.rx
        $dy = ($y - $shape.y) / [double]$shape.ry
        $gaussian = [Math]::Exp(-0.5 * ($dx * $dx + $dy * $dy))
        # Max-combine softly feathered ellipses so overlaps keep the nearer layer.
        $candidate = $background + ($shape.depth - $background) * $gaussian
        if ($candidate -gt $value) { $value = $candidate }
      }
      $byte = [int][Math]::Round([Math]::Min(1.0, [Math]::Max(0.0, $value)) * 255.0)
      $color = [System.Drawing.Color]::FromArgb($byte, $byte, $byte)
      $bitmap.SetPixel($x, $y, $color)
    }
  }
  $bitmap.Save($OutputPng, [System.Drawing.Imaging.ImageFormat]::Png)
}
finally {
  $bitmap.Dispose()
}

$metadata = [ordered]@{
  width = $width
  height = $height
  convention = '0 = far/background, 1 = near/foreground'
  source = 'Hand-authored procedural Gaussian ellipses for local testing; not AI-estimated or physically measured.'
  landmarks = @($landmarks | ForEach-Object {
    [ordered]@{ name = $_.name; x = $_.x; y = $_.y; depth = $_.depth }
  })
}
$metadata | ConvertTo-Json -Depth 4 | Set-Content -LiteralPath $OutputJson -Encoding utf8
Write-Output "Created $OutputPng"
Write-Output "Created $OutputJson"