#Requires -Modules PSScriptAnalyzer

$here = Split-Path -Parent $MyInvocation.MyCommand.Path
$projectRoot = Split-Path -Parent $here
$moduleRoot = "$projectRoot\SnipeitPS"

$manifestFile = "$moduleRoot\SnipeitPS.psd1"
$changelogFile = "$projectRoot\CHANGELOG.md"
$appveyorFile = "$projectRoot\appveyor.yml"
$publicFunctions = "$moduleRoot\Public"

Describe "SnipeitPS" {
    Context "All required tests are present" {
        # We want to make sure that every .ps1 file in the Functions directory that isn't a Pester test has an associated Pester test.
        # This helps keep me honest and makes sure I'm testing my code appropriately.
        It "Includes a test for each PowerShell function in the module" {
            # Get-ChildItem -Path $publicFunctions -Filter "*.ps1" -Recurse | Where-Object -FilterScript {$_.Name -notlike '*.Tests.ps1'} | % {
            #     $expectedTestFile = Join-Path $projectRoot "Tests\$($_.BaseName).Tests.ps1"
            #     $expectedTestFile | Should Exist
            # }
        }
    }

    Context "Manifest, changelog, and AppVeyor" {

        # These tests are...erm, borrowed...from the module tests from the Pester module.
        # I think they are excellent for sanity checking, and all credit for the following
        # tests goes to Dave Wyatt, the genius behind Pester.  I've just adapted them
        # slightly to match SnipeitPS.

        <#$script:manifest = $null

        foreach ($line in (Get-Content $changelogFile))
        {
            if ($line -match "^\D*(?<Version>(\d+\.){1,3}\d+)")
            {
                $changelogVersion = $matches.Version
                break
            }
        }

        foreach ($line in (Get-Content $appveyorFile))
        {
            # (?<Version>()) - non-capturing group, but named Version. This makes it
            # easy to reference the inside group later.

            if ($line -match '^\D*(?<Version>(\d+\.){1,3}\d+).\{build\}')
            {
                $appveyorVersion = $matches.Version
                break
            }
        }

        It "Includes a valid manifest file" {
            {
                $script:manifest = Test-ModuleManifest -Path "$moduleRoot\SnipeitPS.psd1" -ErrorAction Stop -WarningAction SilentlyContinue
            } | Should -Not Throw
        }

        # There is a bug that prevents Test-ModuleManifest from updating correctly when the manifest file changes. See here:
        # https://connect.microsoft.com/PowerShell/feedback/details/1541659/test-modulemanifest-the-psmoduleinfo-is-not-updated

        # As a temp workaround, we'll just read the manifest as a raw hashtable.
        # Credit to this workaround comes from here:
        # https://psescape.azurewebsites.net/pester-testing-your-module-manifest/
        $script:manifest = Invoke-Expression (Get-Content "$moduleRoot\SnipeitPS.psd1" -Raw)

        It "Manifest file includes the correct root module" {
            $script:manifest.RootModule | Should -Be 'SnipeitPS'
        }

        It "Manifest file includes the correct guid" {
            $script:manifest.Guid | Should -Be 'f86f4db4-1cb1-45c4-b7bf-6762531bfdeb'
        }

        It "Manifest file includes a valid version" {
            # $script:manifest.Version -as [Version] | Should Not BeNullOrEmpty
            $script:manifest.ModuleVersion -as [Version] | Should -Not BeNullOrEmpty
        }

        It "Includes a changelog file" {
            $changelogFile | Should -Exist
        }

        # $changelogVersion = $null
        It "Changelog includes a valid version number" {
            $changelogVersion                | Should -Not BeNullOrEmpty
            $changelogVersion -as [Version]  | Should -Not BeNullOrEmpty
        }

        It "Changelog version matches manifest version" {
            $changelogVersion -as [Version] | Should -Be ( $script:manifest.ModuleVersion -as [Version] )
        }

        # Back to me! Pester doesn't use AppVeyor, as far as I know, and I do.

        It "Includes an appveyor.yml file" {
            $appveyorFile | Should -Exist
        }

        It "Appveyor.yml file includes the module version" {
            $appveyorVersion               | Should -Not BeNullOrEmpty
            $appveyorVersion -as [Version] | Should -Not BeNullOrEmpty
        }

        It "Appveyor version matches manifest version" {
            $appveyorVersion -as [Version] | Should -Be ( $script:manifest.ModuleVersion -as [Version] )
        }#>
    }

    # The CI changes I'm testng now will render this section obsolete,
    # as it should automatically patch the module manifest file with all
    # exported function names.
    # Leaving the code here for the moment while I can ensure those
    # features are working correctly.

    #
    # Context "Function checking" {
    #     $functionFiles = Get-ChildItem $publicFunctions -Filter *.ps1 |
    #         Select-Object -ExpandProperty BaseName |
    #         Where-Object { $_ -notlike "*.Tests" }

    #     $internalFiles = Get-ChildItem $internalFunctions -Filter *.ps1 |
    #         Select-Object -ExpandProperty BaseName |
    #         Where-Object { $_ -notlike "*.Tests" }

    #     #$exportedFunctions = $script:manifest.ExportedFunctions.Values.Name
    #     $exportedFunctions = $script:manifest.FunctionsToExport

    #     foreach ($f in $functionFiles) {
    #         It "Exports $f" {
    #             $exportedFunctions -contains $f | Should -Be $true
    #         }
    #     }

    #     foreach ($f in $internalFiles) {
    #         It "Does not export $f" {
    #             $exportedFunctions -contains $f | Should -Be $false
    #         }
    #     }
    # }

    Context "Style checking" {

        # This section is again from the mastermind, Dave Wyatt. Again, credit
        # goes to him for these tests.

        $files = @(
            Get-ChildItem $here -Include *.ps1, *.psm1
            Get-ChildItem $publicFunctions -Include *.ps1, *.psm1 -Recurse
        )

        It 'Source files contain no trailing whitespace' {
            $badLines = @(
                foreach ($file in $files)
                {
                    $lines = [System.IO.File]::ReadAllLines($file.FullName)
                    $lineCount = $lines.Count

                    for ($i = 0; $i -lt $lineCount; $i++)
                    {
                        if ($lines[$i] -match '\s+$')
                        {
                            'File: {0}, Line: {1}' -f $file.FullName, ($i + 1)
                        }
                    }
                }
            )

            if ($badLines.Count -gt 0)
            {
                throw "The following $($badLines.Count) lines contain trailing whitespace: `r`n`r`n$($badLines -join "`r`n")"
            }
        }

        It 'Source files all end with a newline' {
            $badFiles = @(
                foreach ($file in $files)
                {
                    $string = [System.IO.File]::ReadAllText($file.FullName)
                    if ($string.Length -gt 0 -and $string[-1] -ne "`n")
                    {
                        $file.FullName
                    }
                }
            )

            if ($badFiles.Count -gt 0)
            {
                throw "The following files do not end with a newline: `r`n`r`n$($badFiles -join "`r`n")"
            }
        }
    }

    Context 'PSScriptAnalyzer Rules' {
        $analysis = Invoke-ScriptAnalyzer -Path "$moduleRoot" -Recurse -Settings "$projectRoot\PSScriptAnalyzerSettings.psd1"
        $scriptAnalyzerRules = Get-ScriptAnalyzerRule

        forEach ($rule in $scriptAnalyzerRules)
        {
            It "Should pass $rule" {
                If (($analysis) -and ($analysis.RuleName -contains $rule))
                {
                    $analysis |
                        Where-Object RuleName -EQ $rule -OutVariable failures |
                        Out-Default
                    $failures.Count | Should -Be 0
                }
            }
        }
    }
}