#Requires -Version 5.1
<#
.SYNOPSIS
    Pester v5 tests for scripts/New-BuildVM.ps1
#>

BeforeAll {
    $script:ScriptPath   = Join-Path $PSScriptRoot '..\scripts\New-BuildVM.ps1'
    $script:CloneBaseDir = Join-Path $env:TEMP "CI-Tests-CloneBase-$PID"
    New-Item -ItemType Directory -Path $script:CloneBaseDir -Force | Out-Null

    # Fake vmrun.ps1 — exits with $env:FAKE_VMRUN_EXIT (default 0)
    # On success it also creates the destination VMX so the post-clone Test-Path passes.
    # Using .ps1 instead of .cmd avoids Windows cmd redirect limitations inside if blocks.
    $script:FakeVmrun = Join-Path $env:TEMP "fake-vmrun-$PID.ps1"
    Set-Content $script:FakeVmrun -Value @'
# Args: -T ws clone <template> <dst_vmx> linked -snapshot <snapshot>
$exitCode = if ($env:FAKE_VMRUN_EXIT) { [int]$env:FAKE_VMRUN_EXIT } else { 0 }
if ($exitCode -eq 0) {
    # Create the destination VMX (5th positional arg) so Test-Path in caller passes.
    # Real vmrun creates the clone dir+file; we must do the same here.
    $dstVmx = $args[4]   # -T ws clone <tmpl> <dst> ...
    $dstDir = Split-Path $dstVmx -Parent
    if (-not (Test-Path $dstDir)) { New-Item -ItemType Directory -Path $dstDir -Force | Out-Null }
    Set-Content $dstVmx ''
}
exit $exitCode
'@

    # Fake template VMX — just needs to exist
    $script:FakeTemplate = Join-Path $env:TEMP "fake-template-$PID.vmx"
    Set-Content $script:FakeTemplate -Value 'config.version = "8"'
}

AfterAll {
    Remove-Item $script:CloneBaseDir -Recurse -Force -ErrorAction SilentlyContinue
    Remove-Item $script:FakeVmrun    -Force -ErrorAction SilentlyContinue
    Remove-Item $script:FakeTemplate -Force -ErrorAction SilentlyContinue
    $env:FAKE_VMRUN_EXIT = $null
}

# ─────────────────────────────────────────────────────────────────────────────
Describe 'New-BuildVM — parameter validation' {
    It 'throws when TemplatePath does not exist' {
        {
            & $script:ScriptPath `
                -TemplatePath  'C:\DoesNotExist\template.vmx' `
                -CloneBaseDir  $script:CloneBaseDir `
                -JobId         'test-job-1' `
                -VmrunPath     $script:FakeVmrun
        } | Should -Throw
    }
}

# ─────────────────────────────────────────────────────────────────────────────
Describe 'New-BuildVM — vmrun failure' {
    It 'throws and cleans up clone dir when vmrun clone exits non-zero' {
        $env:FAKE_VMRUN_EXIT = '1'
        {
            & $script:ScriptPath `
                -TemplatePath  $script:FakeTemplate `
                -CloneBaseDir  $script:CloneBaseDir `
                -JobId         'test-job-fail' `
                -VmrunPath     $script:FakeVmrun
        } | Should -Throw -ExpectedMessage '*clone failed*'

        # No leftover clone dir
        $leftover = Get-ChildItem $script:CloneBaseDir -Directory |
            Where-Object { $_.Name -like '*test-job-fail*' }
        $leftover | Should -BeNullOrEmpty
    }

    AfterEach { $env:FAKE_VMRUN_EXIT = $null }
}

# ─────────────────────────────────────────────────────────────────────────────
Describe 'New-BuildVM — clone name format' {
    It 'clone folder is named Clone_{JobId}_{yyyyMMdd_HHmmss}' {
        $env:FAKE_VMRUN_EXIT = '0'
        $vmx = & $script:ScriptPath `
            -TemplatePath  $script:FakeTemplate `
            -CloneBaseDir  $script:CloneBaseDir `
            -JobId         'run-42' `
            -VmrunPath     $script:FakeVmrun

        $vmx | Should -Match 'Clone_run-42_\d{8}_\d{6}'
    }

    It 'returns a string ending in .vmx' {
        $env:FAKE_VMRUN_EXIT = '0'
        $vmx = & $script:ScriptPath `
            -TemplatePath  $script:FakeTemplate `
            -CloneBaseDir  $script:CloneBaseDir `
            -JobId         'run-99' `
            -VmrunPath     $script:FakeVmrun

        $vmx | Should -Match '\.vmx$'
    }

    AfterEach {
        $env:FAKE_VMRUN_EXIT = $null
        # Clean up clones created by successful tests
        Get-ChildItem $script:CloneBaseDir -Directory -ErrorAction SilentlyContinue |
            Remove-Item -Recurse -Force -ErrorAction SilentlyContinue
    }
}