# Persona Engine - validation stage
#
# Everything here runs with no tenant, no credentials, and no network (SC-008). That
# is the point: a pipeline that needs a directory connection to tell you a rule file
# is wrong cannot run on every pull request, and the check that only runs sometimes is
# the one that stops catching things.
#
# Gate order is deliberate, cheapest and most categorical first. Sanitization runs
# before anything else because a leaked identifier in a branch is a problem whether or
# not the code compiles, and every later stage prints file contents into build logs.

trigger:
  branches:
    include:
      - main
  paths:
    include:
      - src/*
      - tests/*
      - config/*
      - pipelines/*
      - Invoke-PersonaEngine.ps1
      - Edit-PersonaEngineConfig.ps1
      - PersonaEngine.psd1
      - PersonaEngine.psm1

pr:
  branches:
    include:
      - main

pool:
  vmImage: windows-latest

variables:
  # Pinned rather than latest. A validation stage that changes behaviour when an
  # upstream module publishes is not a gate, it is a coin flip.
  pesterVersion: '5.6.1'
  analyzerVersion: '1.22.0'

steps:
  - checkout: self
    fetchDepth: 0

  - task: PowerShell@2
    displayName: 'Gate 1 - Sanitization (SC-013)'
    inputs:
      pwsh: true
      filePath: tests/Test-Sanitization.ps1
      failOnStderr: false

  - task: PowerShell@2
    displayName: 'Install pinned analysis modules'
    inputs:
      pwsh: true
      targetType: inline
      script: |
        Set-PSRepository -Name PSGallery -InstallationPolicy Trusted
        Install-Module Pester -RequiredVersion $(pesterVersion) -Force -SkipPublisherCheck -Scope CurrentUser
        Install-Module PSScriptAnalyzer -RequiredVersion $(analyzerVersion) -Force -Scope CurrentUser

  - task: PowerShell@2
    displayName: 'Gate 2 - PSScriptAnalyzer'
    inputs:
      pwsh: true
      targetType: inline
      script: |
        $ErrorActionPreference = 'Stop'
        $findings = Invoke-ScriptAnalyzer -Path . -Recurse -Settings ./PSScriptAnalyzerSettings.psd1

        if ($findings) {
          $findings | Format-Table -AutoSize | Out-String | Write-Host
        }

        $blocking = @($findings | Where-Object Severity -in 'Error', 'Warning')
        if ($blocking.Count -gt 0) {
          throw "PSScriptAnalyzer reported $($blocking.Count) blocking finding(s)."
        }

  - task: PowerShell@2
    displayName: 'Gate 3 - Engine purity (Principle IV)'
    inputs:
      pwsh: true
      filePath: tests/Test-EnginePurity.ps1

  - task: PowerShell@2
    displayName: 'Gate 4 - Shipped schema is valid JSON Schema'
    inputs:
      pwsh: true
      targetType: inline
      script: |
        $ErrorActionPreference = 'Stop'

        # V-5a: Test-Json returns $true when the schema itself cannot be parsed, so a
        # broken schema would let every later check pass while validating nothing.
        # This stage exists solely to catch that.
        $errors = $null
        $null = '{}' | Test-Json -SchemaFile ./config/persona-engine.schema.json -ErrorAction SilentlyContinue -ErrorVariable errors

        $unusable = @($errors | Where-Object { $_.Exception.Message -match 'Cannot parse the JSON schema' })
        if ($unusable.Count -gt 0) {
          throw 'config/persona-engine.schema.json is not valid JSON Schema. No configuration can be schema-validated until it is repaired.'
        }

        # The contract copy and the shipped copy must stay identical, or a rule author
        # reading the contract validates against a different schema than the engine.
        $shipped = (Get-FileHash ./config/persona-engine.schema.json -Algorithm SHA256).Hash
        $contract = (Get-FileHash ./specs/001-persona-engine/contracts/persona-engine.schema.json -Algorithm SHA256).Hash

        if ($shipped -ne $contract) {
          throw 'config/persona-engine.schema.json and the contract copy have diverged.'
        }

  - task: PowerShell@2
    displayName: 'Gate 5 - Example configuration passes all four layers'
    inputs:
      pwsh: true
      targetType: inline
      script: |
        $ErrorActionPreference = 'Stop'
        ./Edit-PersonaEngineConfig.ps1 -ConfigPath ./config/persona-engine.example.json -ValidateOnly -NonInteractive
        if ($LASTEXITCODE -ne 0) { throw "The shipped example configuration failed validation with exit code $LASTEXITCODE." }

  - task: PowerShell@2
    displayName: 'Gate 6 - Offline Pester suite (SC-008)'
    inputs:
      pwsh: true
      targetType: inline
      script: |
        $ErrorActionPreference = 'Stop'

        $config = & ./tests/PesterConfiguration.ps1 -Suite Offline
        $config.Run.Exit = $false
        $config.Run.PassThru = $true
        $config.TestResult.Enabled = $true
        $config.TestResult.OutputPath = './testResults.offline.xml'
        $config.Output.Verbosity = 'Normal'

        $result = Invoke-Pester -Configuration $config

        # Asserted, not assumed. A configuration change that silently filtered every
        # test out would otherwise report a green pipeline over zero coverage.
        if ($result.TotalCount -eq 0) { throw 'The offline suite ran no tests.' }
        if ($result.FailedCount -gt 0) { throw "$($result.FailedCount) offline test(s) failed." }

        Write-Host "Offline suite: $($result.PassedCount) passed, $($result.FailedCount) failed."

  - task: PublishTestResults@2
    displayName: 'Publish offline test results'
    condition: succeededOrFailed()
    inputs:
      testResultsFormat: NUnit
      testResultsFiles: './testResults.offline.xml'
      testRunTitle: 'Persona Engine - offline suite'

  - task: PowerShell@2
    displayName: 'Gate 7 - No Graph module was loaded (SC-008)'
    inputs:
      pwsh: true
      targetType: inline
      script: |
        # The proof that the offline suite is genuinely offline. If a test ever
        # imports the Graph SDK, the "runs with no tenant" claim quietly stops being
        # true and nobody notices until an air-gapped build fails.
        $config = & ./tests/PesterConfiguration.ps1 -Suite Offline
        $config.Run.PassThru = $true
        $config.Output.Verbosity = 'None'
        $null = Invoke-Pester -Configuration $config

        $graph = Get-Module | Where-Object Name -like 'Microsoft.Graph*'
        if ($graph) {
          throw "A Graph module was loaded during the offline suite: $($graph.Name -join ', ')"
        }

        Write-Host 'No Graph module was loaded. SC-008 holds.'