PowerShell script using the Template Method pattern to generate financial reports in plain text and HTML formats. Extensible and flexible.

FinanceReport.ps1

class ReportTemplate {
    hidden $data

    GenerateReport() {
        $this.RetrieveFinancialData()
        $this.FormatReport()
        $this.SendToStakeholders()
    }

    RetrieveFinancialData() {
        # Pull the data
        $this.data = $(
            [PSCustomObject]@{Region = 'North'; 'Product' = 'Pear'; Cost = .75 }
            [PSCustomObject]@{Region = 'South'; 'Product' = 'Banana'; Cost = .35 }
            [PSCustomObject]@{Region = 'East'; 'Product' = 'Lime'; Cost = .85 }
            [PSCustomObject]@{Region = 'West'; 'Product' = 'Apple'; Cost = .15 }
        )        
    }

    FormatReport() {
        throw "FormatReport Not Implemented"
    }

    SendToStakeholders() {
        "Sending email" | out-host
        '' | out-host
    }
}

class TextReport : ReportTemplate {
    FormatReport() {
        $r = @("[Plain Text] Report as of $((Get-Date).ToShortDateString())")
        $r += $this.data

        $r | out-host
    }
}

class HtmlReport : ReportTemplate {
    FormatReport() {
        $r = @("<h2>[Html] Report as of $((Get-Date).ToShortDateString()) </h2>")
        $r += "<ul>"
        $r += $this.data | ForEach-Object { "<li>{0} {1} {2}</li>" -f $_.Region, $_.Product, $_.Cost }
        $r += "</ul>"
        $r += ""

        $r | out-host
    }
}

[TextReport]::new().GenerateReport()
[HtmlReport]::new().GenerateReport()

[Plain Text] Report as of Thu 06 06 2024

Region Product Cost
------ ------- ----
North  Pear    0.75
South  Banana  0.35
East   Lime    0.85
West   Apple   0.15

Sending email

<h2>[Html] Report as of Thu 06 06 2024 </h2>
<ul>
<li>North Pear 0.75</li>
<li>South Banana 0.35</li>
<li>East Lime 0.85</li>
<li>West Apple 0.15</li>
</ul>

Sending email