$ErrorActionPreference = 'Stop'
$projectRoot = Split-Path -Parent $PSScriptRoot
$workPath = Join-Path $projectRoot ('temp\template-flow-' + [guid]::NewGuid().ToString('N'))
$templateRoot = Join-Path $workPath 'templates'
$assetRoot = Join-Path $templateRoot 'images'
$databasePath = Join-Path $workPath 'test.mdb'
$configPath = Join-Path $workPath 'test.ini'
$previewRoot = Join-Path $workPath 'previews'
$templatePath = Join-Path $templateRoot 'postcard.html'
$imagePath = Join-Path $assetRoot 'logo.png'
$scriptHost = Join-Path $env:SystemRoot 'SysWOW64\cscript.exe'
$powerShellX86 = Join-Path $env:SystemRoot 'SysWOW64\WindowsPowerShell\v1.0\powershell.exe'

try {
    $null = New-Item -ItemType Directory -Path $assetRoot -Force
    $example = Get-Content -LiteralPath (Join-Path $projectRoot 'config.example.ini') -Raw
    $example.Replace('DB_PATH=data/MassMailer.mdb', ('DB_PATH=' + $databasePath)).Replace(
        'TEMPLATE_ROOT=templates', ('TEMPLATE_ROOT=' + $templateRoot)) |
        Set-Content -LiteralPath $configPath -Encoding UTF8
    & $scriptHost //nologo (Join-Path $PSScriptRoot 'init-db.vbs') $configPath
    if ($LASTEXITCODE -ne 0) { throw 'MDB initialization failed' }

    $png = [Convert]::FromBase64String('iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mP8/x8AAwMCAO+jRZkAAAAASUVORK5CYII=')
    [System.IO.File]::WriteAllBytes($imagePath, $png)
    $safe = '<html><body><h1 style="color:#112233; font-size:20px">Postcard</h1><p>See our offer.</p><img src="images/logo.png" width="1" height="1" alt="Logo" /><a href="http://example.invalid">Details</a></body></html>'
    [System.IO.File]::WriteAllText($templatePath, $safe, [System.Text.Encoding]::UTF8)

    & $powerShellX86 -NoProfile -ExecutionPolicy Bypass -File (Join-Path $PSScriptRoot 'import-template.ps1') -Path $templatePath -ConfigPath $configPath
    if ($LASTEXITCODE -ne 0) { throw 'Valid template import failed' }
    Remove-Item -LiteralPath $imagePath -Force
    $preview = & $powerShellX86 -NoProfile -ExecutionPolicy Bypass -File (Join-Path $PSScriptRoot 'preview-template.ps1') -TemplateId 1 -ConfigPath $configPath -OutputRoot $previewRoot
    if ($LASTEXITCODE -ne 0 -or -not (Test-Path -LiteralPath $preview -PathType Leaf)) { throw 'Snapshot preview failed after source image deletion' }
    $rendered = Get-Content -LiteralPath $preview -Raw
    if ($rendered -notmatch 'image-1.png' -or $rendered -match 'cid:|file:|<script') { throw 'Preview contains an unsafe or missing image reference' }
    $savedImage = Join-Path (Split-Path -Parent $preview) 'image-1.png'
    if (([Convert]::ToBase64String([System.IO.File]::ReadAllBytes($savedImage))) -ne ([Convert]::ToBase64String($png))) {
        throw 'Preview image differs from imported snapshot'
    }

    foreach ($invalid in @(
        $safe.Replace('<p>See our offer.</p>', '<script>alert(1)</script>'),
        $safe.Replace('images/logo.png', '../secret.png'),
        $safe.Replace('color:#112233', 'background-image:url(file:///C:/secret)'),
        $safe.Replace('http://example.invalid', 'javascript:alert(1)')
    )) {
        [System.IO.File]::WriteAllText($templatePath, $invalid, [System.Text.Encoding]::UTF8)
        $ErrorActionPreference = 'Continue'
        $null = & $powerShellX86 -NoProfile -ExecutionPolicy Bypass -File (Join-Path $PSScriptRoot 'import-template.ps1') -Path $templatePath -ConfigPath $configPath 2>$null
        $rejected = $LASTEXITCODE -ne 0
        $ErrorActionPreference = 'Stop'
        if (-not $rejected) { throw 'Unsafe template was accepted' }
    }
    & $powerShellX86 -NoProfile -ExecutionPolicy Bypass -File (Join-Path $PSScriptRoot 'test-template-state.ps1') -ConfigPath $configPath
    if ($LASTEXITCODE -ne 0) { throw 'Invalid imports changed the template library' }
    Write-Output 'Template import, image snapshot, safe preview, and rejection checks passed'
}
finally {
    $resolvedWork = [System.IO.Path]::GetFullPath($workPath)
    $resolvedTemp = [System.IO.Path]::GetFullPath((Join-Path $projectRoot 'temp'))
    if ($resolvedWork.StartsWith($resolvedTemp + [System.IO.Path]::DirectorySeparatorChar,
        [StringComparison]::OrdinalIgnoreCase) -and (Test-Path -LiteralPath $resolvedWork)) {
        Remove-Item -LiteralPath $resolvedWork -Recurse -Force
    }
}