helpers/reports/ConvertTo-HTMLTemplate.ps1

function Convert-HTMLTemplate {
    <#
    .SYNOPSIS
        Populates an HTML template with Bootstrap Table data from a JSON file.
    .DESCRIPTION
        Reads an HTML template file, replaces a placeholder string with Bootstrap Table
        configuration generated from a JSON data file, sets the report name and update time,
        and writes the result to an output file.
    .PARAMETER TemplateFilePath
        Path to the HTML template file containing the placeholder.
    .PARAMETER JsonFilePath
        Path to the JSON data file.
    .PARAMETER OutputFilePath
        Path for the generated output HTML file.
    .PARAMETER Placeholder
        The placeholder string in the template to replace with table data.
    .PARAMETER ReportName
        The report title. Defaults to 'Custom Report'.
    .PARAMETER UpdateTime
        Override the update timestamp. Defaults to the current date and time.
    .EXAMPLE
        Convert-HTMLTemplate -TemplateFilePath ".\template.html" -JsonFilePath "C:\temp\data.json" -OutputFilePath "C:\temp\report.html" -Placeholder "replaceThisHere"
        Generates an HTML report by replacing the placeholder with the JSON data.
    .EXAMPLE
        Convert-HTMLTemplate -TemplateFilePath $template -JsonFilePath $json -OutputFilePath $output -Placeholder "replaceThisHere" -ReportName "Down Monitor Report" -UpdateTime "2025-01-15 10:30:00"
        Generates a named report with a custom timestamp.
    #>

    param(
        [Parameter(Mandatory = $true)]
        [string] $TemplateFilePath,

        [Parameter(Mandatory = $true)]
        [string] $JsonFilePath,

        [Parameter(Mandatory = $true)]
        [string] $OutputFilePath,

        [Parameter(Mandatory = $true)]
        [string] $Placeholder,

        [string] $ReportName = 'Custom Report',
        [string] $UpdateTime
    )

    $JSONtoReplace = ConvertTo-BootstrapTable -JsonFilePath $JsonFilePath
    $replacement = "$JSONtoReplace"

    $htmlTemplate = Get-Content -Path $TemplateFilePath -Raw
    $htmlTemplate = $htmlTemplate -replace $Placeholder, $replacement

    $htmlTemplate = $htmlTemplate -replace 'ReplaceYourReportNameHere', $ReportName

    if (-not $UpdateTime) {
        $UpdateTime = (Get-Date).ToString("yyyy-MM-dd HH:mm:ss")
    }
    $htmlTemplate = $htmlTemplate -replace 'ReplaceUpdateTimeHere', $UpdateTime

    Set-Content -Path $OutputFilePath -Value $htmlTemplate
}
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