# ==============================================================================
# Authors:            Patrick Lehmann
#
# ==============================================================================
# Copyright (C) 2017-2021 Patrick Lehmann - Boetzingen, Germany
# Copyright (C) 2015-2016 Patrick Lehmann - Dresden, Germany
#
#  This program is free software: you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation, either version 2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program.  If not, see <gnu.org/licenses>.
# ==============================================================================

# .SYNOPSIS
# This module provides common CmdLets for the library pre-compilation process.
#
# .DESCRIPTION
# This PowerShell module provides CommandLets (CmdLets) to handle the 'ghdl.exe'
# output streams (stdout and stderr).
#
[CmdletBinding()]
param(
	[Parameter(Mandatory=$true)][string]$VendorToolName,
	[Parameter(Mandatory=$true)][string]$WorkingDir
)

$Module_VendorToolName =  $VendorToolName
$Module_WorkingDir =      $WorkingDir

function Exit-CompileScript
{		<#
		.SYNOPSIS
		Undocumented

		.DESCRIPTION
		Undocumented

		.PARAMETER ExitCode
		ExitCode of this script run
	#>
	[CmdletBinding()]
	param(
		[int]$ExitCode = 0
	)

	cd $Module_WorkingDir

	# unload modules
	Remove-Module config -Verbose:$false
	Remove-Module shared -Verbose:$false

	exit $ExitCode
}

function Get-SourceDirectory
{	<#
		.SYNOPSIS
		Undocumented

		.DESCRIPTION
		Undocumented

		.PARAMETER Source
		Undocumented
		.PARAMETER EnvSource
		Undocumented
	#>
	[CmdletBinding()]
	param(
		[string]$Source,
		[string]$EnvSource
	)

	$VendorToolInstallationDirectory =  Get-VendorToolInstallationDirectory
	$VendorToolSourceDirectory =        Get-VendorToolSourceDirectory

	if ($Source -ne "")
	{	$SourceDirectory = $Source.TrimEnd("\")    }
	elseif ($EnvSource -ne "")
	{	$SourceDirectory = $EnvSource              }
	elseif ($VendorToolInstallationDirectory -ne "")
	{	$SourceDirectory = $VendorToolInstallationDirectory + "\" + $VendorToolSourceDirectory  }
	else
	{	Write-Host "[ERROR]: $Module_VendorToolName is not configured in '$ScriptDir\config.psm1'." -ForegroundColor Red
		Write-Host "  Use adv. options '-Source' and '-Output' or configure 'config.psm1'." -ForegroundColor Red
		Exit-CompileScript -1
	}

	if (-not (Test-Path $SourceDirectory -PathType Container))
	{	Write-Host "[ERROR]: Path '$SourceDirectory' does not exist." -ForegroundColor Red
		Exit-CompileScript -1
	}

	return Convert-Path (Resolve-Path $SourceDirectory)
}

function Get-DestinationDirectory
{	<#
		.SYNOPSIS
		Undocumented

		.DESCRIPTION
		Undocumented

		.PARAMETER Output
		Undocumented
	#>
	[CmdletBinding()]
	param(
		[string]$Output
	)
	if ($Output -ne "")
	{	$DestinationDirectory = $Output.TrimEnd("\")                }
	else
	{	$DestinationDirectory = Get-VendorToolDestinationDirectory  }

	if ($DestinationDirectory -eq "")
	{	Write-Host "[ERROR]: $Module_VendorToolName is not configured in '$ScriptDir\config.psm1'." -ForegroundColor Red
		Write-Host "  Use adv. options '-Source' and '-Output' or configure 'config.psm1'." -ForegroundColor Red
		Exit-CompileScript -1
	}

	if (-not [System.IO.Path]::IsPathRooted($DestinationDirectory))
	{	$DestinationDirectory = "$Module_WorkingDir\$DestinationDirectory"    }

	return $DestinationDirectory
}

function Get-GHDLBinary
{	<#
		.SYNOPSIS
		Undocumented

		.DESCRIPTION
		Undocumented

		.PARAMETER GHDL
		Undocumented
	#>
	[CmdletBinding()]
	param(
		[string]$GHDL
	)

	if ($GHDL -ne "")
	{	$GHDLBinary = $GHDL       }
	elseif (Test-Path env:GHDL)
	{	$GHDLBinary = $env:GHDL   }
	else
	{	try
		{	write-host "calling which ..."
			$GHDLBinary = (Get-Command "ghdl.exe").Source }
		catch
		{	Write-Host "Use adv. options '-GHDL' to set the GHDL executable." -ForegroundColor Red
			Exit-CompileScript -1
		}
	}

	if (-not (Test-Path $GHDLBinary -PathType Leaf))
	{	Write-Host "Use adv. options '-GHDL' to set the GHDL executable." -ForegroundColor Red
		Exit-CompileScript -1
	}

	return $GHDLBinary
}


function Get-VHDLVariables
{	<#
		.SYNOPSIS
		Undocumented

		.DESCRIPTION
		Undocumented

		.PARAMETER VHDL93
		Undocumented
		.PARAMETER VHDL2008
		Undocumented
	#>
	[CmdletBinding()]
	param(
		[bool]$VHDL93 =   $false,
		[bool]$VHDL2008 = $true
	)

	if ($VHDL93)
	{	$VHDLVersion =  "v93"
		$VHDLStandard = "93c"
		$VHDLFlavor =   "synopsys"
	}
	elseif ($VHDL2008)
	{	$VHDLVersion =  "v08"
		$VHDLStandard = "08"
		$VHDLFlavor =   "synopsys"
	}
	else
	{	$VHDLVersion =  "v93"
		$VHDLStandard = "93c"
		$VHDLFlavor =   "synopsys"
	}
	return $VHDLVersion,$VHDLStandard,$VHDLFlavor
}

function New-DestinationDirectory
{	<#
		.SYNOPSIS
		Undocumented

		.DESCRIPTION
		Undocumented

		.PARAMETER DestinationDirectory
		Undocumented
	#>
	[CmdletBinding()]
	param(
		[Parameter(Mandatory=$true)][string]$DestinationDirectory
	)

	if (Test-Path $DestinationDirectory -PathType Container)
	{	Write-Host "Vendor directory '$DestinationDirectory' already exists." -ForegroundColor Yellow    }
	elseif (Test-Path $DestinationDirectory -PathType Leaf)
	{	Write-Host "[ERROR]: Vendor directory '$DestinationDirectory' already exists as a file." -ForegroundColor Red
		Exit-CompileScript -1
	}
	else
	{	Write-Host "Creating vendor directory: '$DestinationDirectory'." -ForegroundColor Yellow
		mkdir "$DestinationDirectory" -ErrorAction SilentlyContinue | Out-Null
	}
}

function Start-PackageCompilation
{	<#
		.SYNOPSIS
		Undocumented

		.DESCRIPTION
		Undocumented

		.PARAMETER GHDLBinary
		Undocumented
		.PARAMETER GHDLOptions
		Undocumented
		.PARAMETER Library
		Undocumented
		.PARAMETER SourceFiles
		Undocumented
		.PARAMETER HaltOnError
		Undocumented
	#>
	[CmdletBinding()]
	param(
		[Parameter(Mandatory=$true)][string]$GHDLBinary,
		[Parameter(Mandatory=$true)][string[]]$GHDLOptions,
		[Parameter(Mandatory=$true)][string]$DestinationDirectory,
		[Parameter(Mandatory=$true)][string]$Library,
		[Parameter(Mandatory=$true)][string]$VHDLVersion,
		[Parameter(Mandatory=$true)][string[]]$SourceFiles,
		[Parameter(Mandatory=$true)][bool]$SuppressWarnings,
		[Parameter(Mandatory=$true)][bool]$HaltOnError
	)
	# set default valuesvalues
	$EnableDebug =    [bool]$PSCmdlet.MyInvocation.BoundParameters["Debug"]
	$EnableVerbose =  [bool]$PSCmdlet.MyInvocation.BoundParameters["Verbose"] -or $EnableDebug

	if ($EnableDebug)
	{	$Indent = "      "  }
	elseif ($EnableVerbose)
	{	$Indent = "    "    }
	else
	{	$Indent = "    "    }

	Write-Host "Compiling library '$Library' ..." -ForegroundColor Yellow
	$LibraryDirectory=  "$DestinationDirectory/$Library/$VHDLVersion"
	$EnableVerbose -and (Write-Host "  Creating library $Library ..."  -ForegroundColor Gray      ) | Out-Null
	$EnableDebug -and   (Write-Host "    mkdir $LibraryDirectory"      -ForegroundColor DarkGray  ) | Out-Null
	mkdir $LibraryDirectory -ErrorAction SilentlyContinue | Out-Null
	$EnableDebug -and   (Write-Host "    cd $LibraryDirectory"         -ForegroundColor DarkGray  ) | Out-Null
	cd $LibraryDirectory
	$ErrorCount = 0
	foreach ($File in $SourceFiles)
	{	Write-Host "  Analyzing package file '$File'" -ForegroundColor DarkCyan
		$InvokeExpr = "& '$GHDLBinary' " + ($GHDLOptions -join " ") + " --work=$Library " + $File + " 2>&1"
		$EnableDebug -and (Write-Host "    $InvokeExpr"                  -ForegroundColor DarkGray  ) | Out-Null
		$ErrorRecordFound = Invoke-Expression $InvokeExpr | Restore-NativeCommandStream | Write-ColoredGHDLLine $SuppressWarnings -Indent:"$Indent"
		if (($LastExitCode -ne 0) -or $ErrorRecordFound)
		{	$ErrorCount += 1
			if ($HaltOnError)
			{	break    }
	  }
	}

	cd $DestinationDirectory
	return $ErrorCount
}

function Start-PrimitiveCompilation
{	<#
		.SYNOPSIS
		Undocumented

		.DESCRIPTION
		Undocumented

		.PARAMETER GHDLBinary
		Undocumented
		.PARAMETER GHDLOptions
		Undocumented
		.PARAMETER Library
		Undocumented
		.PARAMETER SourceFiles
		Undocumented
		.PARAMETER HaltOnError
		Undocumented
	#>
	[CmdletBinding()]
	param(
		[Parameter(Mandatory=$true)][string]$GHDLBinary,
		[Parameter(Mandatory=$true)][string[]]$GHDLOptions,
		[Parameter(Mandatory=$true)][string]$DestinationDirectory,
		[Parameter(Mandatory=$true)][string]$Library,
		[Parameter(Mandatory=$true)][string]$VHDLVersion,
		[Parameter(Mandatory=$true)][string[]]$SourceFiles,
		[Parameter(Mandatory=$true)][bool]$SuppressWarnings,
		[Parameter(Mandatory=$true)][bool]$HaltOnError
	)
	# set default values
	$EnableDebug =    [bool]$PSCmdlet.MyInvocation.BoundParameters["Debug"]
	$EnableVerbose =  [bool]$PSCmdlet.MyInvocation.BoundParameters["Verbose"] -or $EnableDebug

	if ($EnableDebug)
	{	$Indent = "      "  }
	elseif ($EnableVerbose)
	{	$Indent = "    "    }
	else
	{	$Indent = "    "    }

	Write-Host "Compiling library '$Library' ..." -ForegroundColor Cyan
	$LibraryDirectory="$DestinationDirectory/$Library/$VHDLVersion"
	$EnableVerbose -and (Write-Host "  Creating library $Library ..."  -ForegroundColor Gray  ) | Out-Null
	$EnableDebug -and   (Write-Host "    mkdir $LibraryDirectory"  -ForegroundColor DarkGray  ) | Out-Null
	mkdir $LibraryDirectory -ErrorAction SilentlyContinue | Out-Null
	$EnableDebug -and   (Write-Host "    cd $LibraryDirectory"     -ForegroundColor DarkGray  ) | Out-Null
	cd $LibraryDirectory
	$ErrorCount = 0
	foreach ($File in $SourceFiles)
	{	Write-Host "  Analyzing primitive file '$File'" -ForegroundColor DarkCyan
		$InvokeExpr = "& '$GHDLBinary' " + ($GHDLOptions -join " ") + " --work=$Library " + $File + " 2>&1"
		$EnableDebug -and (Write-Host "    $InvokeExpr"              -ForegroundColor DarkGray  ) | Out-Null
		$ErrorRecordFound = Invoke-Expression $InvokeExpr | Restore-NativeCommandStream | Write-ColoredGHDLLine $SuppressWarnings -Indent:"$Indent"
		if (($LastExitCode -ne 0) -or $ErrorRecordFound)
		{	$ErrorCount += 1
			if ($HaltOnError)
			{	break    }
		}
	}

	cd $DestinationDirectory
	return $ErrorCount
}


function Restore-NativeCommandStream
{	<#
		.SYNOPSIS
		This CmdLet gathers multiple ErrorRecord objects and reconstructs outputs
		as a single line.

		.DESCRIPTION
		This CmdLet collects multiple ErrorRecord objects and emits one String
		object per line.

		.PARAMETER InputObject
		A object stream is required as an input.
	#>
	[CmdletBinding()]
	param(
		[Parameter(ValueFromPipeline=$true)]
		$InputObject
	)

	process
	{	if (-not $InputObject)
    {	Write-Host "Empty pipeline!"  }
    elseif ($InputObject -is [System.Management.Automation.ErrorRecord])
    {	if ($InputObject.FullyQualifiedErrorId -eq "NativeCommandError")
      {	Write-Output $InputObject.ToString()    }
      elseif ($InputObject.FullyQualifiedErrorId -eq "NativeCommandErrorMessage")
      {	Write-Output $InputObject.ToString()    }
    }
    elseif ($InputObject -is [String])
    {	Write-Output $InputObject    }
    else
    {	Write-Host "Unsupported object in pipeline stream"    }
	}
}

function Write-ColoredGHDLLine
{	<#
		.SYNOPSIS
		This CmdLet colors GHDL output lines.

		.DESCRIPTION
		This CmdLet colors GHDL output lines. Warnings are prefixed with 'WARNING: '
		in yellow and errors are prefixed with 'ERROR: ' in red.

		.PARAMETER InputObject
		A object stream is required as an input.
		.PARAMETER SuppressWarnings
		Skip warning messages. (Show errors only.)
		.PARAMETER Indent
		Indentation string.
	#>
	[CmdletBinding()]
	param(
		[Parameter(ValueFromPipeline=$true)]
		$InputObject,

		[Parameter(Position=1)]
		[switch]$SuppressWarnings = $false,
		[Parameter(Position=2)]
		[string]$Indent = ""
	)

	begin
	{	$ErrorRecordFound = $false  }

	process
	{	if ($InputObject -is [String])
		{	if ($InputObject -match ":\d+:\d+:warning:\s")
			{	if (-not $SuppressWarnings)
				{	Write-Host "${Indent}WARNING: " -NoNewline -ForegroundColor Yellow
					Write-Host $InputObject
				}
			}
			elseif ($InputObject -match ":\d+:\d+:\s")
			{	$ErrorRecordFound  = $true
				Write-Host "${Indent}ERROR: "    -NoNewline -ForegroundColor Red
				Write-Host $InputObject
			}
			elseif ($InputObject -match ":warning:\s")
			{	Write-Host "${Indent}WARNING: "    -NoNewline -ForegroundColor Yellow
				Write-Host $InputObject
			}
			elseif ($InputObject -match ":error:\s")
			{	$ErrorRecordFound  = $true
				Write-Host "${Indent}ERROR: "    -NoNewline -ForegroundColor Red
				Write-Host $InputObject
			}
			elseif ($InputObject -match ": unknown option\s")
			{	$ErrorRecordFound  = $true
				Write-Host "${Indent}ERROR: "    -NoNewline -ForegroundColor Red
				Write-Host $InputObject
			}
			elseif ($InputObject -match ": cannot open\s")
			{	$ErrorRecordFound  = $true
				Write-Host "${Indent}ERROR: "    -NoNewline -ForegroundColor Red
				Write-Host $InputObject
			}
			else
			{	Write-Host "${Indent}$InputObject"    }
		}
		else
		{	Write-Host "Unsupported object in pipeline stream"    }
	}

	end
	{	$ErrorRecordFound    }
}

Export-ModuleMember -Function 'Exit-CompileScript'

Export-ModuleMember -Function 'Get-SourceDirectory'
Export-ModuleMember -Function 'Get-DestinationDirectory'
Export-ModuleMember -Function 'Get-GHDLBinary'

Export-ModuleMember -Function 'Get-VHDLVariables'

Export-ModuleMember -Function 'New-DestinationDirectory'
Export-ModuleMember -Function 'Start-PackageCompilation'
Export-ModuleMember -Function 'Start-PrimitiveCompilation'


Export-ModuleMember -Function 'Restore-NativeCommandStream'
Export-ModuleMember -Function 'Write-ColoredGHDLLine'