[CmdletBinding()]
param(
	[switch] $SkipRestore,
	[switch] $CollectCoverage
)

$ErrorActionPreference = 'Stop'
$repositoryRoot = Split-Path -Parent $PSScriptRoot
$testResultsPath = Join-Path $repositoryRoot 'TestResults\Validation'
$dotnetHome = Join-Path (Split-Path -Parent $repositoryRoot) '.dotnet-cli-validation'
$nugetPackagesPath = if ($env:NUGET_PACKAGES) { $env:NUGET_PACKAGES } else { Join-Path $env:USERPROFILE '.nuget\packages' }

$env:DOTNET_CLI_HOME = $dotnetHome
$env:DOTNET_GENERATE_ASPNET_CERTIFICATE = 'false'
$env:DOTNET_SKIP_FIRST_TIME_EXPERIENCE = '1'
$env:DOTNET_CLI_TELEMETRY_OPTOUT = '1'
$env:DOTNET_NOLOGO = '1'
$env:NUGET_PACKAGES = $nugetPackagesPath

function Invoke-External
{
	param(
		[Parameter(Mandatory)] [string] $FilePath,
		[Parameter(Mandatory)] [string[]] $ArgumentList
	)

	& $FilePath @ArgumentList
	if ($LASTEXITCODE -ne 0)
	{
		throw "Command failed with exit code ${LASTEXITCODE}: $FilePath $($ArgumentList -join ' ')"
	}
}

function Test-LineEndings
{
	$crlfExtensions = @('.cs', '.csproj', '.sln', '.props', '.targets', '.config', '.json', '.xml', '.md', '.txt', '.ps1', '.cmd', '.bat')
	$lfExtensions = @('.svg', '.html', '.css', '.js', '.sh', '.yml', '.yaml')
	$invalidFiles = [System.Collections.Generic.List[string]]::new()
	$files = @(& git -C $repositoryRoot diff --name-only --diff-filter=ACMRT)
	if ($LASTEXITCODE -ne 0) { throw 'Unable to enumerate modified repository files.' }
	$files += @(& git -C $repositoryRoot diff --cached --name-only --diff-filter=ACMRT)
	if ($LASTEXITCODE -ne 0) { throw 'Unable to enumerate staged repository files.' }
	$files += @(& git -C $repositoryRoot ls-files --others --exclude-standard)
	if ($LASTEXITCODE -ne 0) { throw 'Unable to enumerate untracked repository files.' }
	$files = $files | Sort-Object -Unique

	foreach ($relativePath in $files)
	{
		$extension = [System.IO.Path]::GetExtension($relativePath).ToLowerInvariant()
		if (($extension -notin $crlfExtensions) -and ($extension -notin $lfExtensions)) { continue }

		$fullPath = Join-Path $repositoryRoot $relativePath
		if (-not (Test-Path -LiteralPath $fullPath -PathType Leaf)) { continue }
		$bytes = [System.IO.File]::ReadAllBytes($fullPath)
		for ($index = 0; $index -lt $bytes.Length; $index++)
		{
			if (($extension -in $crlfExtensions) -and ($bytes[$index] -eq 10) -and (($index -eq 0) -or ($bytes[$index - 1] -ne 13)))
			{
				$invalidFiles.Add($relativePath)
				break
			}
			if (($extension -in $lfExtensions) -and ($bytes[$index] -eq 13))
			{
				$invalidFiles.Add($relativePath)
				break
			}
		}
	}

	if ($invalidFiles.Count -gt 0)
	{
		throw "Files with incorrect line endings:
$($invalidFiles -join "
")"
	}
}

function Test-CoverageReport
{
	param([Parameter(Mandatory)] [string] $ResultsPath)

	$report = Get-ChildItem -LiteralPath $ResultsPath -Filter 'coverage.cobertura.xml' -Recurse | Select-Object -First 1
	if (($null -eq $report) -or ($report.Length -eq 0))
	{
		throw "A non-empty Cobertura coverage report was not found under $ResultsPath"
	}

	[xml] $coverage = Get-Content -LiteralPath $report.FullName -Raw
	if ($coverage.DocumentElement.Name -ne 'coverage')
	{
		throw "The coverage report at $($report.FullName) is not valid Cobertura XML."
	}
}

Push-Location $repositoryRoot
try
{
	Write-Host 'Validating BusinessMgr workspace...'
	if (-not $SkipRestore)
	{
		Invoke-External dotnet @('restore', 'BusinessMgr.sln', '--disable-build-servers', '--verbosity', 'minimal')
	}

	Invoke-External dotnet @('build', 'BusinessMgr.sln', '--configuration', 'Debug', '--no-restore', '--disable-build-servers', '--verbosity', 'minimal', '--maxcpucount:1')
	Invoke-External dotnet @('test', 'SaBusMgrTest_Control\SaBusMgrTest_Control.csproj', '--configuration', 'Debug', '--no-build', '--no-restore', '--results-directory', $testResultsPath, '--verbosity', 'minimal')
	Invoke-External dotnet @('test', 'SaBusMgrTest_Portal\SaBusMgrTest_Portal.csproj', '--configuration', 'Debug', '--no-build', '--no-restore', '--results-directory', $testResultsPath, '--verbosity', 'minimal')
	if ($CollectCoverage)
	{
		$coverageRunPath = Join-Path $testResultsPath "Coverage\$([guid]::NewGuid())"
		$controlCoveragePath = Join-Path $coverageRunPath 'Control'
		$portalCoveragePath = Join-Path $coverageRunPath 'Portal'

		Invoke-External dotnet @('test', 'SaBusMgrTest_Control\SaBusMgrTest_Control.csproj', '--configuration', 'Debug', '--no-build', '--no-restore', '--collect', 'XPlat Code Coverage', '--results-directory', $controlCoveragePath, '--verbosity', 'minimal')
		Test-CoverageReport $controlCoveragePath
		Invoke-External dotnet @('test', 'SaBusMgrTest_Portal\SaBusMgrTest_Portal.csproj', '--configuration', 'Debug', '--no-build', '--no-restore', '--collect', 'XPlat Code Coverage', '--results-directory', $portalCoveragePath, '--verbosity', 'minimal')
		Test-CoverageReport $portalCoveragePath
	}
	Invoke-External dotnet @('list', 'SaBusMgrStandardBase\SaBusMgrStandardBase.csproj', 'package', '--vulnerable', '--include-transitive')
	Invoke-External dotnet @('list', 'SaBusMgrCoreProcs\SaBusMgrCoreProcs.csproj', 'package', '--vulnerable', '--include-transitive')
	Invoke-External dotnet @('list', 'SaBusMgrCoreWeb\SaBusMgrCoreWeb.csproj', 'package', '--vulnerable', '--include-transitive')
	Invoke-External dotnet @('list', 'SaBusinessMgrCoreWebControl\SaBusinessMgrCoreWebControl.csproj', 'package', '--vulnerable', '--include-transitive')
	Invoke-External dotnet @('list', 'SaBusinessMgrCoreWebPortal\SaBusinessMgrCoreWebPortal.csproj', 'package', '--vulnerable', '--include-transitive')
	Invoke-External git @('diff', '--check')
	Test-LineEndings

	Write-Host 'BusinessMgr validation passed.' -ForegroundColor Green
}
finally
{
	Pop-Location
}