param(
    [Parameter(Mandatory = $true)][string]$RequestPath,
    [string]$ConfigPath = (Join-Path (Split-Path -Parent $PSScriptRoot) 'config.ini'),
    [string]$OutputRoot = (Join-Path (Split-Path -Parent $PSScriptRoot) 'temp\previews')
)
$ErrorActionPreference = 'Stop'
. (Join-Path $PSScriptRoot 'campaign-common.ps1')
$context = Get-MailContext -ConfigPath $ConfigPath
$request = Read-CampaignRequest $RequestPath
$db = Open-MailDatabase $context
try {
    $review = Get-CampaignReview $context $request $db
    $previewPath = Write-CampaignPreview $review $OutputRoot
    [pscustomobject]@{
        Count = $review.Contacts.Count
        Token = $review.Token
        PreviewPath = $previewPath
        TemplateName = $review.TemplateName
        TemplateVersion = $review.TemplateVersion
        From = $review.Identity.From
        ReplyTo = $review.Identity.ReplyTo
        TestTo = $review.Identity.TestTo
        PostalAddress = $review.Identity.Postal
        Subject = $review.Subject
    } | ConvertTo-Json -Compress
}
finally { $db.Dispose() }