#Requires -Modules @{ ModuleName = 'Pester'; ModuleVersion = '5.0.0' }

<#
    SC-010: -NonInteractive never prompts and never hangs.

    Each case runs the editor in a child pwsh with stdin redirected from an empty
    file, which is what a build agent gives it. A tool that prompts there does not
    fail - it blocks until the job times out, and the pipeline reports an
    infrastructure problem rather than a bad configuration.

    A wall-clock timeout is the assertion. That makes these the slowest tests in the
    suite, and there is no cheaper way to prove the absence of a hang: inspecting the
    source for Read-Host would only prove that one spelling of prompting is absent.
#>

BeforeAll {
    $repoRoot = Split-Path (Split-Path $PSScriptRoot -Parent) -Parent
    . (Join-Path $repoRoot 'tests/TestHelpers.ps1')

    $script:editor = Join-Path $repoRoot 'Edit-PersonaEngineConfig.ps1'
    $script:scratch = Join-Path ([System.IO.Path]::GetTempPath()) ("pe-ni-{0}" -f [guid]::NewGuid().ToString('N'))
    $null = New-Item -ItemType Directory -Path $script:scratch -Force

    $script:emptyStdin = Join-Path $script:scratch 'empty.txt'
    Set-Content -LiteralPath $script:emptyStdin -Value '' -NoNewline

    function Invoke-EditorWithClosedStdin {
        <#
            Runs the editor with stdin from an empty file and a hard timeout.
            Returns the exit code, or -1 if it had to be killed.
        #>
        param(
            [string[]] $ArgumentList,
            [int] $TimeoutSeconds = 60
        )

        $stdout = Join-Path $script:scratch ("out-{0}.txt" -f [guid]::NewGuid().ToString('N'))
        $stderr = Join-Path $script:scratch ("err-{0}.txt" -f [guid]::NewGuid().ToString('N'))

        $process = Start-Process -FilePath (Get-Process -Id $PID).Path `
            -ArgumentList (@('-NoProfile', '-NonInteractive', '-File', $script:editor) + $ArgumentList) `
            -RedirectStandardInput $script:emptyStdin `
            -RedirectStandardOutput $stdout `
            -RedirectStandardError $stderr `
            -PassThru -WindowStyle Hidden

        if (-not $process.WaitForExit($TimeoutSeconds * 1000)) {
            $process.Kill($true)
            return [pscustomobject]@{ ExitCode = -1; Output = 'TIMED OUT'; TimedOut = $true }
        }

        [pscustomobject]@{
            ExitCode = $process.ExitCode
            Output   = (Get-Content -LiteralPath $stdout -Raw -ErrorAction SilentlyContinue)
            Error    = (Get-Content -LiteralPath $stderr -Raw -ErrorAction SilentlyContinue)
            TimedOut = $false
        }
    }
}

AfterAll {
    Remove-Item -LiteralPath $script:scratch -Recurse -Force -ErrorAction SilentlyContinue
}

Describe 'Non-interactive mode never prompts or hangs (SC-010)' {

    It 'completes on a valid configuration with stdin closed' {
        $path = Save-TestConfiguration -Document (New-TestConfigurationDocument) -Directory $script:scratch

        $run = Invoke-EditorWithClosedStdin -ArgumentList @('-ConfigPath', $path, '-ValidateOnly', '-NonInteractive')

        $run.TimedOut | Should -BeFalse
        $run.ExitCode | Should -Be 0
    }

    It 'completes on an invalid configuration with stdin closed' {
        $document = New-TestConfigurationDocument
        $document.rules[1].id = $document.rules[0].id

        $path = Save-TestConfiguration -Document $document -Directory $script:scratch

        $run = Invoke-EditorWithClosedStdin -ArgumentList @('-ConfigPath', $path, '-ValidateOnly', '-NonInteractive')

        $run.TimedOut | Should -BeFalse
        $run.ExitCode | Should -Be 1
    }

    It 'completes with -NonInteractive alone, without -ValidateOnly' {
        # The case most likely to regress: -NonInteractive must short-circuit before
        # the editor loop even when the caller did not also ask for validate-only.
        $path = Save-TestConfiguration -Document (New-TestConfigurationDocument) -Directory $script:scratch

        $run = Invoke-EditorWithClosedStdin -ArgumentList @('-ConfigPath', $path, '-NonInteractive')

        $run.TimedOut | Should -BeFalse
        $run.ExitCode | Should -Be 0
    }

    It 'completes when the configuration file does not exist' {
        $run = Invoke-EditorWithClosedStdin -ArgumentList @('-ConfigPath', (Join-Path $script:scratch 'absent.json'), '-NonInteractive')

        $run.TimedOut | Should -BeFalse
        $run.ExitCode | Should -Be 3
    }

    It 'completes when running synthetic rule tests' {
        $path = Save-TestConfiguration -Document (New-TestConfigurationDocument) -Directory $script:scratch

        $run = Invoke-EditorWithClosedStdin -ArgumentList @(
            '-ConfigPath', $path, '-NonInteractive', '-TestDataPath', (Join-Path $repoRoot 'tests/TestData'))

        $run.TimedOut | Should -BeFalse
        $run.ExitCode | Should -Be 0
    }

    It 'emits no prompt text on the output stream' {
        $path = Save-TestConfiguration -Document (New-TestConfigurationDocument) -Directory $script:scratch

        $run = Invoke-EditorWithClosedStdin -ArgumentList @('-ConfigPath', $path, '-NonInteractive')

        $run.Output | Should -Not -Match 'Choice'
        $run.Output | Should -Not -Match 'configuration editor'
    }
}