# 一次性资产生成脚本：把 docs/screenshots 与 icons/dist 的原图缩放并转码到 site/assets。
# 站点本身零构建，这个脚本只在替换截图时手动重跑。
param(
  [string]$Repo = (Resolve-Path (Join-Path $PSScriptRoot '..\..')).Path
)

Add-Type -AssemblyName System.Drawing

$outDir = $PSScriptRoot
$srcShots = Join-Path $Repo 'docs\screenshots'
$srcIcons = Join-Path $Repo 'icons\dist'

function Save-Jpeg {
  param([System.Drawing.Bitmap]$Bitmap, [string]$Path, [int]$Quality = 88)
  $codec = [System.Drawing.Imaging.ImageCodecInfo]::GetImageEncoders() | Where-Object { $_.MimeType -eq 'image/jpeg' }
  $params = New-Object System.Drawing.Imaging.EncoderParameters 1
  $params.Param[0] = New-Object System.Drawing.Imaging.EncoderParameter ([System.Drawing.Imaging.Encoder]::Quality), ([int]$Quality)
  $Bitmap.Save($Path, $codec, $params)
  $params.Dispose()
}

function Resize-Shot {
  param([string]$In, [string]$Out, [int]$MaxWidth = 1600, [int]$Quality = 88)
  $src = [System.Drawing.Image]::FromFile($In)
  try {
    $scale = [Math]::Min(1.0, $MaxWidth / $src.Width)
    $w = [int][Math]::Round($src.Width * $scale)
    $h = [int][Math]::Round($src.Height * $scale)
    $bmp = New-Object System.Drawing.Bitmap $w, $h
    try {
      $g = [System.Drawing.Graphics]::FromImage($bmp)
      $g.InterpolationMode = [System.Drawing.Drawing2D.InterpolationMode]::HighQualityBicubic
      $g.PixelOffsetMode = [System.Drawing.Drawing2D.PixelOffsetMode]::HighQuality
      $g.SmoothingMode = [System.Drawing.Drawing2D.SmoothingMode]::HighQuality
      $g.DrawImage($src, 0, 0, $w, $h)
      $g.Dispose()
      Save-Jpeg -Bitmap $bmp -Path $Out -Quality $Quality
      "{0}`t{1}x{2}`t{3} KB" -f (Split-Path $Out -Leaf), $w, $h, [Math]::Round((Get-Item $Out).Length / 1KB)
    } finally { $bmp.Dispose() }
  } finally { $src.Dispose() }
}

$map = @(
  @{ In = 'PeopleLib_bAecy2Izab.png'; Out = 'shot-library.jpg' }
  @{ In = 'PeopleLib_34BtvLsqDE.png'; Out = 'shot-search.jpg' }
  @{ In = 'PeopleLib_ScQMUA2D24.png'; Out = 'shot-reader.jpg' }
  @{ In = 'PeopleLib_2N6zVpCFBA.png'; Out = 'shot-ai.jpg' }
  @{ In = 'ai-send-confirmation.png'; Out = 'shot-ai-confirm.jpg' }
  @{ In = 'pdf-annotations.png'; Out = 'shot-annotations.jpg' }
)

foreach ($m in $map) {
  $in = Join-Path $srcShots $m.In
  if (Test-Path $in) { Resize-Shot -In $in -Out (Join-Path $outDir $m.Out) }
  else { Write-Warning "缺少源图 $in" }
}

foreach ($v in @('light', 'dark')) {
  foreach ($size in @(32, 256, 512)) {
    $in = Join-Path $srcIcons "$v\icon-$size.png"
    if (Test-Path $in) { Copy-Item $in (Join-Path $outDir "icon-$v-$size.png") -Force }
  }
}

# Open Graph 封面：深色底 + 应用图标 + 书库截图，1200x630。
$og = New-Object System.Drawing.Bitmap 1200, 630
try {
  $g = [System.Drawing.Graphics]::FromImage($og)
  $g.InterpolationMode = [System.Drawing.Drawing2D.InterpolationMode]::HighQualityBicubic
  $g.SmoothingMode = [System.Drawing.Drawing2D.SmoothingMode]::HighQuality
  $g.TextRenderingHint = [System.Drawing.Text.TextRenderingHint]::ClearTypeGridFit
  $g.Clear([System.Drawing.ColorTranslator]::FromHtml('#12141a'))

  $shot = Join-Path $outDir 'shot-library.jpg'
  if (Test-Path $shot) {
    $img = [System.Drawing.Image]::FromFile($shot)
    try {
      $targetW = 660
      $scale = $targetW / $img.Width
      $h = [int][Math]::Round($img.Height * $scale)
      $g.DrawImage($img, 500, [int]((630 - $h) / 2), $targetW, $h)
    } finally { $img.Dispose() }
  }

  $iconPath = Join-Path $outDir 'icon-dark-256.png'
  if (Test-Path $iconPath) {
    $icon = [System.Drawing.Image]::FromFile($iconPath)
    try { $g.DrawImage($icon, 72, 132, 112, 112) } finally { $icon.Dispose() }
  }

  $white = New-Object System.Drawing.SolidBrush ([System.Drawing.ColorTranslator]::FromHtml('#f4f5f7'))
  $muted = New-Object System.Drawing.SolidBrush ([System.Drawing.ColorTranslator]::FromHtml('#a8aeba'))
  $fTitle = New-Object System.Drawing.Font 'Microsoft YaHei', 44, ([System.Drawing.FontStyle]::Bold)
  $fSub = New-Object System.Drawing.Font 'Microsoft YaHei', 19
  $fFoot = New-Object System.Drawing.Font 'Microsoft YaHei', 15
  $g.DrawString('PeopleLib', $fTitle, $white, 68, 268)
  $g.DrawString("多源文献检索`n本地书库与内置阅读器", $fSub, $muted, 72, 348)
  $g.DrawString('reader.mesalogo.com', $fFoot, $muted, 72, 470)
  $g.Dispose()
  Save-Jpeg -Bitmap $og -Path (Join-Path $outDir 'og-cover.jpg') -Quality 86
  "og-cover.jpg`t1200x630`t{0} KB" -f [Math]::Round((Get-Item (Join-Path $outDir 'og-cover.jpg')).Length / 1KB)
} finally { $og.Dispose() }