. $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 = ""

#region Get-LocalNlbIp

# Handle the AWS Native Functions When AWSPowerShell Not Available
if ($null -eq (Get-Command "Get-EC2NetworkInterface" -ErrorAction SilentlyContinue))
{
    function Get-EC2NetworkInterface {

        throw "This Should Never Be Actually Called"
    }
}

Describe "Get-LocalNlbIp" {

    Mock -ModuleName $moduleForMock Test-IsAws { return $true }
    Mock -ModuleName $moduleForMock Get-EC2NetworkInterface { return $null }
    Mock -ModuleName $moduleForMock Get-CurrentInstance {

        $placementMock = New-Object PSObject -Property @{

            "AvailabilityZone" = "us-east-1a";
        }

        $pod6Instance = New-Object PSObject -Property @{

        Placement = $placementMock;

        Tag = @(
                @{Key = $Global:AlkamiTagKeyRole; Value = $Global:AlkamiTagValueRoleWeb},
                @{Key = $Global:AlkamiTagKeyEnvironment;  Value = $Global:AlkamiTagValueEnvironmentProd},
                @{Key = "alk:pod";  Value = "6"}
            );
        }

        return $pod6Instance
    }

    Context "When Environment Names Overlap" {

        Mock -ModuleName $moduleForMock Get-EC2NetworkInterface {

            # args[1] is an ec2 filter based on the AvailabilityZone from the current instance
            # https://docs.aws.amazon.com/sdkfornet/v3/apidocs/items/EC2/TFilter.html
            $ec2Filter = $args[1]

            Write-Warning "Using EC2 Filter Value: $($ec2Filter.Values)"

            $possibleReturns = @(

                @{ "Description"="ELB net/12.6-prod-nlb-something"; Id="Test"; "AvailabilityZone"="us-east-1a";  "PrivateIpAddress"="8.8.8.8";         InterfaceType="network_load_balancer"},
                @{ "Description"="ELB net/6-prod-nlb-something";    Id="Test"; "AvailabilityZone"="us-east-1a";  "PrivateIpAddress"="100.100.100.100"; InterfaceType="network_load_balancer"}
            )

            return $possibleReturns | Where-Object {$_.AvailabilityZone -like $ec2Filter.Values}
        }

        It "Returns the Correct IP When Searching for POD 6 and 12.6 is Available" {

            Get-LocalNlbIp | Should -Be "100.100.100.100"
        }
    }

    Context "When the Environment is an App Server" {

        Mock -ModuleName $moduleForMock Get-CurrentInstance {

            $placementMock = New-Object PSObject -Property @{

                "AvailabilityZone" = "us-east-1a";
            }

            $pod6Instance = New-Object PSObject -Property @{

            Placement = $placementMock;

            Tag = @(
                    @{Key = $Global:AlkamiTagKeyRole; Value = $Global:AlkamiTagValueRoleApp},
                    @{Key = $Global:AlkamiTagKeyEnvironment;  Value = $Global:AlkamiTagValueEnvironmentProd},
                    @{Key = "alk:pod";  Value = "6"}
                );
            }

            return $pod6Instance
        }

        It "Writes a Warning" {

            ( Get-LocalNlbIp 3>&1 ) -match "This is currently running on an app server." | Should -Be $true
        }
    }

    Context "Environment Tag Switch" {

        $validEnvironments = @("Prod", "DR")

        foreach ($Global:podBasedEnvironment in $validEnvironments) {

            It "Uses the alk:pod tag when the environment is $podBasedEnvironment" {

                Mock -ModuleName $moduleForMock Get-CurrentInstance {

                   $placementMock = New-Object PSObject -Property @{

                        "AvailabilityZone" = "us-east-1a";
                   }

                   $pod6Instance = New-Object PSObject -Property @{

                   Placement = $placementMock;

                   Tag = @(
                            @{Key = $Global:AlkamiTagKeyRole;  Value = $Global:AlkamiTagValueRoleWeb},
                            @{Key = $Global:AlkamiTagKeyEnvironment;   Value = "$podBasedEnvironment"},
                            @{Key = "alk:pod";   Value = "Pass"},
                            @{Key = "alk:lane";  Value = "Fail"}
                        );
                    }

                    return $pod6Instance
                }

                Mock -ModuleName $moduleForMock Get-EC2NetworkInterface {

                    # args[1] is an ec2 filter based on the NLB name constructed from the current instance
                    # https://docs.aws.amazon.com/sdkfornet/v3/apidocs/items/EC2/TFilter.html
                    $ec2Filter = $args[1]

                    Write-Warning "Using EC2 Filter Value: $($ec2Filter.Values)"

                    $possibleReturns = @(

                        @{ "Description"="ELB net/Pass-$podBasedEnvironment-nlb-something"; Id="Test"; "AvailabilityZone"="us-east-1a"; "PrivateIpAddress"="100.100.100.100"; InterfaceType="network_load_balancer"},
                        @{ "Description"="ELB net/Fail-$podBasedEnvironment-nlb-something"; Id="Test"; "AvailabilityZone"="us-east-1a"; "PrivateIpAddress"="9.9.9.9";         InterfaceType="network_load_balancer"},
                        @{ "Description"="ELB net/Fail-staging-nlb-something";              Id="Test"; "AvailabilityZone"="us-east-1a"; "PrivateIpAddress"="8.8.8.8";         InterfaceType="network_load_balancer"}
                    )

                    return $possibleReturns | Where-Object {$_.AvailabilityZone -like $ec2Filter.Values}
                }

                Get-LocalNlbIp | Should -Be 100.100.100.100
            }
        }

        It "Uses the alk:lane tag when the environment is Staging" {

            Mock -ModuleName $moduleForMock Get-CurrentInstance {

               $placementMock = New-Object PSObject -Property @{

                    "AvailabilityZone" = "us-east-1a";
               }

               $pod6Instance = New-Object PSObject -Property @{

               Placement = $placementMock;

               Tag = @(
                        @{Key = $Global:AlkamiTagKeyRole;  Value = $Global:AlkamiTagValueRoleWeb},
                        @{Key = $Global:AlkamiTagKeyEnvironment;   Value = $Global:AlkamiTagValueEnvironmentStaging},
                        @{Key = "alk:pod";   Value = "Fail"},
                        @{Key = "alk:lane";  Value = "Pass"}
                    );
                }

                return $pod6Instance
            }


            Mock -ModuleName $moduleForMock Get-EC2NetworkInterface {

                # args[1] is an ec2 filter based on the NLB name constructed from the current instance
                # https://docs.aws.amazon.com/sdkfornet/v3/apidocs/items/EC2/TFilter.html
                $ec2Filter = $args[1]

                Write-Warning "Using EC2 Filter Value: $($ec2Filter.Values)"

                $possibleReturns = @(

                    @{ "Description"="ELB net/Pass-staging-nlb-something"; Id="Test"; "AvailabilityZone"="us-east-1a"; "PrivateIpAddress"="100.100.100.100"; InterfaceType="network_load_balancer"},
                    @{ "Description"="ELB net/Fail-staging-nlb-something"; Id="Test"; "AvailabilityZone"="us-east-1a"; "PrivateIpAddress"="9.9.9.9";         InterfaceType="network_load_balancer"}
                    @{ "Description"="ELB net/Fail-prod-nlb-something";    Id="Test"; "AvailabilityZone"="us-east-1a"; "PrivateIpAddress"="8.8.8.8";         InterfaceType="network_load_balancer"}
                )

                return $possibleReturns | Where-Object {$_.AvailabilityZone -like $ec2Filter.Values}
         }

            Get-LocalNlbIp | Should -Be 100.100.100.100
        }

        $validEnvironments = @("Dev", "QA")

        foreach ($Global:designationBasedEnvironment in $validEnvironments) {
            It "Uses the alk:designation tag when the environment is $designationBasedEnvironment" {

                Mock -ModuleName $moduleForMock Get-CurrentInstance {

                   $placementMock = New-Object PSObject -Property @{
                        "AvailabilityZone" = "us-east-1a";
                   }

                   $instance = New-Object PSObject -Property @{

                        Placement = $placementMock;

                        Tag = @(
                            @{Key = $Global:AlkamiTagKeyRole;        Value = $Global:AlkamiTagValueRoleWeb},
                            @{Key = $Global:AlkamiTagKeyEnvironment;         Value = "$designationBasedEnvironment"},
                            @{Key = "alk:pod";         Value = "Fail"},
                            @{Key = "alk:lane";        Value = "Fail"},
                            @{Key = "alk:designation"; Value = "Pass"}
                        );
                    }

                    return $instance
                }

                Mock -ModuleName $moduleForMock Get-EC2NetworkInterface {

                    # args[1] is an ec2 filter based on the NLB name constructed from the current instance
                    # https://docs.aws.amazon.com/sdkfornet/v3/apidocs/items/EC2/TFilter.html
                    $ec2Filter = $args[1]

                    Write-Warning "Using EC2 Filter Value: $($ec2Filter.Values)"

                    $possibleReturns = @(
                        @{ "Description"="ELB net/Pass-$designationBasedEnvironment-nlb-something"; Id="Test"; "AvailabilityZone"="us-east-1a"; "PrivateIpAddress"="100.100.100.100"; InterfaceType="network_load_balancer"},
                        @{ "Description"="ELB net/Fail-$designationBasedEnvironment-nlb-something"; Id="Test"; "AvailabilityZone"="us-east-1a"; "PrivateIpAddress"="9.9.9.9";         InterfaceType="network_load_balancer"}
                        @{ "Description"="ELB net/Fail-prod-nlb-something";                         Id="Test"; "AvailabilityZone"="us-east-1a"; "PrivateIpAddress"="8.8.8.8";         InterfaceType="network_load_balancer"}
                    )

                    return $possibleReturns | Where-Object {$_.AvailabilityZone -like $ec2Filter.Values}
                }

                Get-LocalNlbIp | Should -Be 100.100.100.100
            }
        }
    }

    Context "Error Scenarios" {

        Mock -ModuleName $moduleForMock Get-EC2NetworkInterface {

                    # args[1] is an ec2 filter based on the NLB name constructed from the current instance
                    # https://docs.aws.amazon.com/sdkfornet/v3/apidocs/items/EC2/TFilter.html
                    $ec2Filter = $args[1]

                    Write-Warning "Using EC2 Filter Value: $($ec2Filter.Values)"

                    $possibleReturns = @(

                        @{ "Description"="ELB net/Pass-$podBasedEnvironment-nlb-something"; Id="Test"; "AvailabilityZone"="us-east-1a"; "PrivateIpAddress"="100.100.100.100"; InterfaceType="network_load_balancer"},
                        @{ "Description"="ELB net/Pass-$podBasedEnvironment-nlb-something"; Id="Test"; "AvailabilityZone"="us-east-1a"; "PrivateIpAddress"="111.111.111.111"; InterfaceType="network_load_balancer"}
                    )

                    return $possibleReturns | Where-Object {$_.AvailabilityZone -like $ec2Filter.Values}
                }

        It "Writes a Warning and Returns Null When No Match Found" {

                    Mock -ModuleName $moduleForMock Get-CurrentInstance {

                   $placementMock = New-Object PSObject -Property @{

                        "AvailabilityZone" = "us-east-999";
                   }

                   $pod6Instance = New-Object PSObject -Property @{

                   Placement = $placementMock;

                   Tag = @(
                            @{Key = $Global:AlkamiTagKeyRole;  Value = $Global:AlkamiTagValueRoleWeb},
                            @{Key = $Global:AlkamiTagKeyEnvironment;   Value = "$podBasedEnvironment"},
                            @{Key = "alk:pod";   Value = "Pass"},
                            @{Key = "alk:lane";  Value = "Fail"}
                        );
                    }

                    return $pod6Instance
                }

            Mock -CommandName Write-Warning -MockWith {} -ModuleName $moduleForMock

            Get-LocalNlbIp | Should -BeNullOrEmpty
            Assert-MockCalled -CommandName Write-Warning -Times 1 -Exactly -Scope It `
                -ModuleName $moduleForMock -ParameterFilter { $Message -match "No ENIs found with Description" }
        }

        It "Writes a Warning and Returns Null When More Than One Match Found" {

                    Mock -ModuleName $moduleForMock Get-CurrentInstance {

                   $placementMock = New-Object PSObject -Property @{

                        "AvailabilityZone" = "us-east-1a";
                   }

                   $pod6Instance = New-Object PSObject -Property @{

                   Placement = $placementMock;

                   Tag = @(
                            @{Key = $Global:AlkamiTagKeyRole;  Value = $Global:AlkamiTagValueRoleWeb},
                            @{Key = $Global:AlkamiTagKeyEnvironment;   Value = "$podBasedEnvironment"},
                            @{Key = "alk:pod";   Value = "Pass"},
                            @{Key = "alk:lane";  Value = "Fail"}
                        );
                    }

                    return $pod6Instance
                }

            Mock -CommandName Write-Warning -MockWith {} -ModuleName $moduleForMock

            Get-LocalNlbIp | Should -BeNullOrEmpty
            Assert-MockCalled -CommandName Write-Warning -Times 1 -Exactly -Scope It `
                -ModuleName $moduleForMock -ParameterFilter { $Message -match "2 ENIs found with Description" }
        }
    }
}

#endregion Get-LocalNlbIp