. $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 "Publish-MessageToSlack" {
    Context "When Sending Messages To Multiple Channels " {
        It "Calls Invoke-RestMethod multiple times" {
            $channels = @(
                "#testChannel1",
                "#testChannel2"
            )

            $params = @{
                "username"   = "@user1"
                "icon_emoji" = ":smiley:"
                "text"       = "sampletext"
            }
            Mock -ModuleName $moduleForMock Invoke-RestMethod { return $true }

            Publish-MessageToSlack -channels $channels -slackHookUrl "www.dummyurl.com" -MessageBody $params

            Assert-MockCalled Invoke-RestMethod -Times 2 -ModuleName $moduleForMock
        }
    }

    Context "When Message Body Does Not Contain Required Values" {
        It "Should Throw" {
            $channels = @(
                "#testChannel1",
                "#testChannel2"
            )

            # No text value, which is required
            $params = @{
                "username"   = "@user1"
                "icon_emoji" = ":smiley:"
            }

            Mock -ModuleName $moduleForMock Invoke-RestMethod { return $true }

            { Publish-MessageToSlack -channels $channels -slackHookUrl "www.dummyurl.com" -slackParameters $params } | Should -Throw "Missing required parameter key 'text' on 'SlackParameters'."
        }
    }

    Context "When Message Body And Message Text Are Both Empty" {
        It "Should Throw" {
            $channels = @(
                "#testChannel1",
                "#testChannel2"
            )

            Mock -ModuleName $moduleForMock Invoke-RestMethod { return $true }

            { Publish-MessageToSlack -channels $channels -slackHookUrl "www.dummyurl.com" } | Should -Throw "SlackParameters or MessageText must be populated to send a message!"
        }
    }

    Context "When Attachment List Is Invalid" {
        It "Should Throw" {
            $channels = @(
                "#testChannel1",
                "#testChannel2"
            )

            # Actions.url must be in a valid http format. Can't just add "sometext".
            $actions = @(
                @{
                    "type" = "button";
                    "text" = "Nginx Server";
                    "url"  = "http://google.com"
                }
            )

            # Attachment is missing fallback, which is required.
            $params = @{
                "username"    = "@user1"
                "icon_emoji"  = ":smiley:"
                "text"        = "I am a test with an invalid attachment"
                "attachments" = @(
                    @{
                        color   = "green";
                        actions = $actions
                    }
                )
            }

            Mock -ModuleName $moduleForMock Invoke-RestMethod { return $true }

            { Publish-MessageToSlack -channels $channels -slackHookUrl "www.dummyurl.com" -slackParameters $params } | Should -Throw "Missing required parameter key 'fallback' on 'SlackAttachments'."
        }
    }
}

Context "When Sending Message is Successful" {
    It "Should Not Throw" {
        $channels = @(
            "#testChannel1",
            "#testChannel2"
        )

        $params = @{
            "username"   = "@user1"
            "icon_emoji" = ":smiley:"
            "text"       = "sampletext"
        }
        # Actions.url must be in a valid http format. Can't just add "sometext".
        $buildLog = "https://google.com"
        $fallback = "View the Build: $buildLog"
        $actions = @(
            @{
                "type" = "button"
                "text" = "Build Log"
                "url"  = $buildLog
            }
        )
        $attachments = @{
            fallback = $fallback
            color    = "#009EFF"
            actions  = $actions
        }
        Mock -ModuleName $moduleForMock Invoke-RestMethod { return $true }
        Mock Write-Host -ModuleName $moduleForMock `
        -ParameterFilter { $Object -like "*Both SlackParameters and MessageText parameters are not null. Choosing SlackParameters as message body." } `
        -MockWith { }

        { Publish-MessageToSlack -channels $channels -slackHookUrl "www.dummyurl.com" -MessageBody $params -SlackAttachments $attachments } | Should -Not -Throw

        Assert-MockCalled Write-Host -Exactly 0 -ModuleName $moduleForMock -Scope It
    }

    It "Should Not Throw" {
        $channels = @(
            "#testChannel1",
            "#testChannel2"
        )
        Mock -ModuleName $moduleForMock Invoke-RestMethod { return $true }
        Mock Write-Host -ModuleName $moduleForMock `
        -ParameterFilter { $Object -like "*Both SlackParameters and MessageText parameters are not null. Choosing SlackParameters as message body." } `
        -MockWith { }

        { Publish-MessageToSlack -channels $channels -slackHookUrl "www.dummyurl.com" -MessageText "sample text" -IconEmoji ":slack:" -Username "someuser" } | Should -Not -Throw

        Assert-MockCalled Write-Host -Exactly 0 -ModuleName $moduleForMock -Scope It
    }

    It "Should Not Throw" {
        $channels = @(
            "#testChannel1",
            "#testChannel2"
        )

        $params = @{
            "username"   = "@user1"
            "icon_emoji" = ":smiley:"
            "text"       = "sampletext"
        }
        Mock -ModuleName $moduleForMock Invoke-RestMethod { return $true }
        Mock Write-Host -ModuleName $moduleForMock `
        -ParameterFilter { $Object -like "*Both SlackParameters and MessageText parameters are not null. Choosing SlackParameters as message body." } `
        -MockWith { }

        { Publish-MessageToSlack -channels $channels -slackHookUrl "www.dummyurl.com" -MessageBody $params -MessageText "sample text" -IconEmoji ":slack:" -Username "someuser" } | Should -Not -Throw

        Assert-MockCalled Write-Host -Exactly 1 -ModuleName $moduleForMock -Scope It
    }

    It "Should Call Invoke-RestMethod" {
        $channels = @(
            "#testChannel1",
            "#testChannel2"
        )

        $params = @{
            "username"   = "@user1"
            "icon_emoji" = ":smiley:"
            "text"       = "sampletext"
        }
        Mock -ModuleName $moduleForMock Invoke-RestMethod { return $true }

        Publish-MessageToSlack -channels $channels -slackHookUrl "www.dummyurl.com" -MessageBody $params

        Assert-MockCalled Invoke-RestMethod -ModuleName $moduleForMock
    }
}

Context "When Setting Both MessageBody And MessageText" {
    It "Should Not Throw" {
        $channels = @(
            "#testChannel1",
            "#testChannel2"
        )

        $params = @{
            "username"   = "@user1"
            "icon_emoji" = ":smiley:"
            "text"       = "sampletext"
        }

        $messageText = "sampletext"

        Mock -ModuleName $moduleForMock Invoke-RestMethod { return $true }
        Mock Write-Host -ModuleName $moduleForMock `
            -ParameterFilter { $Object -like "*Both SlackParameters and MessageText parameters are not null. Choosing SlackParameters as message body." } `
            -MockWith { }

        { Publish-MessageToSlack -channels $channels -slackHookUrl "www.dummyurl.com" -MessageBody $params -MessageText $messageText } | Should -Not -Throw
    }

    It "Should Write Override Output" {
        $channels = @(
            "#testChannel1",
            "#testChannel2"
        )

        $params = @{
            "username"   = "@user1"
            "icon_emoji" = ":smiley:"
            "text"       = "sampletext"
        }

        $messageText = "sampletext"

        Mock -ModuleName $moduleForMock Invoke-RestMethod { return $true }
        Mock Write-Host -ModuleName $moduleForMock `
            -ParameterFilter { $Object -like "*Both SlackParameters and MessageText parameters are not null. Choosing SlackParameters as message body." } `
            -MockWith { }

        Publish-MessageToSlack -channels $channels -slackHookUrl "www.dummyurl.com" -MessageBody $params -MessageText $messageText

        Assert-MockCalled Write-Host -Exactly 1 -ModuleName $moduleForMock -Scope It
    }

    It "Should Call Invoke-RestMethod" {
        $channels = @(
            "#testChannel1",
            "#testChannel2"
        )

        $params = @{
            "username"   = "@user1"
            "icon_emoji" = ":smiley:"
            "text"       = "sampletext"
        }

        $messageText = "sampletext"

        Mock -ModuleName $moduleForMock Invoke-RestMethod { return $true }
        Mock Write-Host -ModuleName $moduleForMock `
            -ParameterFilter { $Object -like "*Both SlackParameters and MessageText parameters are not null. Choosing SlackParameters as message body." } `
            -MockWith { }

        Publish-MessageToSlack -channels $channels -slackHookUrl "www.dummyurl.com" -MessageBody $params -MessageText $messageText

        Assert-MockCalled Invoke-RestMethod -ModuleName $moduleForMock
    }
}