. $PSScriptRoot\..\..\Load-PesterModules.ps1
$here = Split-Path -Parent $MyInvocation.MyCommand.Path
$sut = (Split-Path -Leaf $MyInvocation.MyCommand.Path) -replace '\.tests\.', '.'
$functionPath = Join-Path -Path $here -ChildPath $sut
Write-Host "Overriding SUT: $functionPath"
Import-Module $functionPath -Force
$moduleForMock = ""

Describe "Select-InstallPackages" {
    function Get-PackageObject{
        param(
            $packageName,
            $packageVersion
        )

        $properties = @{ Name = $packageName; Version = $packageVersion; Feed = $null; Tags = $null; IsService = $null; StartMode = $null}
        $package = New-Object -TypeName PSObject -Prop $properties;

        return $package
    }

    Context "When InstallPackages is Null or Empty"{

        $packages = [System.Collections.ArrayList]::new()

        $packageObject1 = Get-PackageObject -packageName "Alkami.FakeService1" -packageVersion "1.0.0"
        $packageObject2 = Get-PackageObject -packageName "Alkami.FakeService2" -packageVersion "1.0.0"

        $packages.Add($packageObject1)
        $packages.Add($packageObject2)

        It "Returns Packages on Null"{
            $installPackages = $null
            $returnedInstallPackages = Select-InstallPackages -Packages $packages -InstallPackages $installPackages

            $returnedInstallPackages | Should -Be $packages
        }

        It "Returns Packages on Empty"{
            $installPackages = [System.Collections.ArrayList]::new()
            $returnedInstallPackages = Select-InstallPackages -Packages $packages -InstallPackages $installPackages

            $returnedInstallPackages | Should -Be $packages
        }
    }

    Context "When Given a Packages Array with Null Entries"{
        $packages = [System.Collections.ArrayList]::new()

        $packageObject1 = Get-PackageObject -packageName "Alkami.FakeService1" -packageVersion "1.0.0"
        $packageObject2 = Get-PackageObject -packageName "Alkami.FakeService2" -packageVersion "1.0.0"
        $packageObject3 = $null

        $packages.Add($packageObject1)
        $packages.Add($packageObject2)
        $packages.Add($packageObject3)

        It "Strips Null Entries"{
            $installPackages = [System.Collections.ArrayList]::new()
            $returnedInstallPackages = Select-InstallPackages -Packages $packages -InstallPackages $installPackages

            $returnedInstallPackages.Count | Should -Be 2
        }
    }

    Context "When Given the Same Package in Both Arrays" {

        $packages = [System.Collections.ArrayList]::new()
        $installPackages = [System.Collections.ArrayList]::new()

        $packageObject1 = Get-PackageObject -packageName "Alkami.FakeService1" -packageVersion "1.0.0"
        $packageObject2 = Get-PackageObject -packageName "Alkami.FakeService1" -packageVersion "1.7.2"

        $packages.Add($packageObject1)
        $installPackages.Add($packageObject2)

        It "Takes the Value from InstallPackages" {
            $returnedInstallPackages = Select-InstallPackages -Packages $packages -InstallPackages $installPackages

            $returnedInstallPackages[0].Version | Should -Be "1.7.2"
        }
    }
    Context "When Given New Packages In InstallPackages"{

        $packages = [System.Collections.ArrayList]::new()
        $installPackages = [System.Collections.ArrayList]::new()

        $packageObject1 = Get-PackageObject -packageName "Alkami.FakeService1" -packageVersion "1.0.0"
        $packageObject2 = Get-PackageObject -packageName "Alkami.FakeService2" -packageVersion "1.0.0"

        $packages.Add($packageObject1)
        $installPackages.Add($packageObject2)

        It "Adds the New Values to Packages"{
            $returnedInstallPackages = Select-InstallPackages -Packages $packages -InstallPackages $installPackages

            $returnedInstallPackages.Name -Contains 'Alkami.FakeService1' | Should -BeTrue
            $returnedInstallPackages.Name -Contains 'Alkami.FakeService2' | Should -BeTrue
        }
    }
}