$repositoryRoot = (Resolve-Path (Join-Path $PSScriptRoot '..')).Path
$wallpaperScript = Join-Path $repositoryRoot 'scripts\Set-SguWelcomeWallpaper.ps1'
$source = Get-Content -LiteralPath $wallpaperScript -Raw
$tokens = $null
$parseErrors = $null
$ast = [Management.Automation.Language.Parser]::ParseFile($wallpaperScript, [ref]$tokens, [ref]$parseErrors)
if ($parseErrors.Count) { throw ($parseErrors -join [Environment]::NewLine) }
$lookup = $ast.Find({
    param($node)
    $node -is [Management.Automation.Language.FunctionDefinitionAst] -and
        $node.Name -eq 'Get-DirectoryWelcomeMetadata'
}, $true)

function Invoke-WelcomeFixture {
    param(
        $DirectoryGender,
        [string]$ExplicitGender,
        [string]$DirectoryLocation = 'Sala de pruebas',
        [string]$DirectoryOu = 'Laboratorio',
        [string]$MachineLocation,
        [string]$MachineOu
    )

    # Replace only the external directory lookup. Execute the actual script,
    # including its validated parameters, metadata assignment and JPEG renderer.
    $fixtureJson = [pscustomobject]@{
        DisplayName = 'Usuario de prueba'
        Gender = $DirectoryGender
        Location = $DirectoryLocation
        OrganizationalUnit = $DirectoryOu
    } | ConvertTo-Json -Compress
    $fixtureFunction = 'function Get-DirectoryWelcomeMetadata { param($UserName, $MachineName); ConvertFrom-Json ''' +
        $fixtureJson.Replace("'", "''") + ''' }'
    $fixtureSource = $source.Remove($lookup.Extent.StartOffset, $lookup.Extent.EndOffset - $lookup.Extent.StartOffset).
        Insert($lookup.Extent.StartOffset, $fixtureFunction)
    $testScript = Join-Path $TestDrive ('wallpaper-' + [Guid]::NewGuid().ToString('N') + '.ps1')
    [IO.File]::WriteAllText($testScript, $fixtureSource, [Text.UTF8Encoding]::new($false))
    $parameters = @{
        BaseImagePath = Join-Path $repositoryRoot 'assets\branding\darkblue.jpg'
        FontsPath = Join-Path $repositoryRoot 'assets\branding\fonts'
        OutputPath = Join-Path $TestDrive ([IO.Path]::GetFileNameWithoutExtension($testScript) + '.jpg')
        CanvasWidth = 640
        CanvasHeight = 480
        SkipApply = $true
    }
    if ($ExplicitGender) { $parameters.Gender = $ExplicitGender }
    $previousLocalAppData = $env:LOCALAPPDATA
    $previousMachineLocation = $env:SGU_WELCOME_LOCATION
    $previousMachineOu = $env:SGU_WELCOME_ORGANIZATIONAL_UNIT
    try {
        $env:LOCALAPPDATA = $TestDrive
        $env:SGU_WELCOME_LOCATION = $MachineLocation
        $env:SGU_WELCOME_ORGANIZATIONAL_UNIT = $MachineOu
        & $testScript @parameters
    }
    finally {
        $env:LOCALAPPDATA = $previousLocalAppData
        $env:SGU_WELCOME_LOCATION = $previousMachineLocation
        $env:SGU_WELCOME_ORGANIZATIONAL_UNIT = $previousMachineOu
    }
}

Describe 'Welcome wallpaper with AD metadata' {
    It 'renders a neutral JPEG when AD has no gender' {
        $result = Invoke-WelcomeFixture -DirectoryGender $null
        $result.WelcomeHeading | Should Be 'Te damos la bienvenida,'
        $result.Applied | Should Be $false
        $bitmap = [Drawing.Image]::FromFile($result.OutputPath)
        try { $bitmap.Width | Should Be 640; $bitmap.Height | Should Be 480 }
        finally { $bitmap.Dispose() }
    }

    It 'uses neutral wording for empty or unrecognized metadata' {
        foreach ($value in @('', 'Unknown')) {
            (Invoke-WelcomeFixture -DirectoryGender $value).WelcomeHeading | Should Be 'Te damos la bienvenida,'
        }
    }

    It 'keeps the gendered greetings for recognized directory values' {
        (Invoke-WelcomeFixture -DirectoryGender 'Female').WelcomeHeading | Should Be 'Bienvenida,'
        (Invoke-WelcomeFixture -DirectoryGender 'Male').WelcomeHeading | Should Be 'Bienvenido,'
    }

    It 'honors an explicit gender over directory metadata' {
        (Invoke-WelcomeFixture -DirectoryGender 'Female' -ExplicitGender 'Male').WelcomeHeading | Should Be 'Bienvenido,'
    }

    It 'renders the flexible classroom and immediate OU as an access label' {
        $result = Invoke-WelcomeFixture -DirectoryGender $null `
            -DirectoryLocation 'Aula Flexible' `
            -DirectoryOu 'Centro de Experiencia Digital'
        $result.LocationText | Should Be "Acceso al Aula Flexible`ndel Centro de Experiencia Digital."
        $result.LocationPrimaryText | Should Be 'Acceso al Aula Flexible'
        $result.LocationSecondaryText | Should Be 'del Centro de Experiencia Digital.'
    }

    It 'uses the requested neutral, masculine and feminine location wording' {
        $neutral = Invoke-WelcomeFixture -DirectoryGender $null `
            -DirectoryLocation 'Sala de Aplicaciones' `
            -DirectoryOu 'Laboratorio de Cómputo de Ingeniería'
        $neutral.LocationPrimaryText | Should Be 'Acceso a la Sala de Aplicaciones'
        $neutral.LocationSecondaryText | Should Be 'del Laboratorio de Cómputo de Ingeniería.'

        $male = Invoke-WelcomeFixture -DirectoryGender 'Male' `
            -DirectoryLocation 'Aula Flexible' `
            -DirectoryOu 'Centro de Experiencia Digital'
        $male.LocationPrimaryText | Should Be 'Estás ubicado en el Aula Flexible'
        $male.LocationSecondaryText | Should Be 'del Centro de Experiencia Digital.'

        $female = Invoke-WelcomeFixture -DirectoryGender 'Female' `
            -DirectoryLocation 'Sala de Redes' `
            -DirectoryOu 'Laboratorio de Cómputo de Ingeniería'
        $female.LocationPrimaryText | Should Be 'Estás ubicada en la Sala de Redes'
        $female.LocationSecondaryText | Should Be 'del Laboratorio de Cómputo de Ingeniería.'
    }

    It 'keeps machine location metadata when the GPO command has no location arguments' {
        $result = Invoke-WelcomeFixture -DirectoryGender $null `
            -DirectoryLocation 'Sala de pruebas' `
            -DirectoryOu 'Laboratorio' `
            -MachineLocation 'Aula Flexible' `
            -MachineOu 'Centro de Experiencia Digital'
        $result.LocationText | Should Be "Acceso al Aula Flexible`ndel Centro de Experiencia Digital."
    }

    It 'ships the logo inside the base image instead of compositing it at runtime' {
        $source | Should Not Match 'lasalle-logo-blanco|DrawImage.*logo|composite.*logo'
        $bitmap = [Drawing.Bitmap]::FromFile((Join-Path $repositoryRoot 'assets\branding\darkblue.jpg'))
        try {
            $whitePixels = 0
            for ($x = 60; $x -lt 390; $x += 2) {
                for ($y = 45; $y -lt 175; $y += 2) {
                    $pixel = $bitmap.GetPixel($x, $y)
                    if ($pixel.R -gt 220 -and $pixel.G -gt 220 -and $pixel.B -gt 220) {
                        $whitePixels++
                    }
                }
            }
            ($whitePixels -gt 250) | Should Be $true
        }
        finally {
            $bitmap.Dispose()
        }
    }
}