<#
.SYNOPSIS
  Helper script create virtual env.

.DESCRIPTION
  This script will detect Python installation, create venv and install
  all necessary packages from `requirements.txt` needed by Pype to be
  included during application freeze on Windows.

.EXAMPLE

PS> .\create_env.ps1

#>

$arguments=$ARGS
$poetry_verbosity=""
if($arguments -eq "--verbose") {
    $poetry_verbosity="-vvv"
}

function Exit-WithCode($exitcode) {
   # Only exit this host process if it's a child of another PowerShell parent process...
   $parentPID = (Get-CimInstance -ClassName Win32_Process -Filter "ProcessId=$PID" | Select-Object -Property ParentProcessId).ParentProcessId
   $parentProcName = (Get-CimInstance -ClassName Win32_Process -Filter "ProcessId=$parentPID" | Select-Object -Property Name).Name
   if ('powershell.exe' -eq $parentProcName) { $host.SetShouldExit($exitcode) }

   exit $exitcode
}


function Show-PSWarning() {
    if ($PSVersionTable.PSVersion.Major -lt 7) {
        Write-Host "!!! " -NoNewline -ForegroundColor Red
        Write-Host "You are using old version of PowerShell. $($PSVersionTable.PSVersion.Major).$($PSVersionTable.PSVersion.Minor)"
        Write-Host "Please update to at least 7.0 - " -NoNewline -ForegroundColor Gray
        Write-Host "https://github.com/PowerShell/PowerShell/releases" -ForegroundColor White
        Exit-WithCode 1
    }
}


function Install-Poetry() {
    Write-Host ">>> " -NoNewline -ForegroundColor Green
    Write-Host "Installing Poetry ... "
    (Invoke-WebRequest -Uri https://raw.githubusercontent.com/python-poetry/poetry/master/get-poetry.py -UseBasicParsing).Content | python -
    # add it to PATH
    $env:PATH = "$($env:PATH);$($env:USERPROFILE)\.poetry\bin"
}


function Test-Python() {
    Write-Host ">>> " -NoNewline -ForegroundColor green
    Write-Host "Detecting host Python ... " -NoNewline
    if (-not (Get-Command "python" -ErrorAction SilentlyContinue)) {
        Write-Host "!!! Python not detected" -ForegroundColor red
        Set-Location -Path $current_dir
        Exit-WithCode 1
    }
    $version_command = @'
import sys
print('{0}.{1}'.format(sys.version_info[0], sys.version_info[1]))
'@

    $p = & python -c $version_command
    $env:PYTHON_VERSION = $p
    $m = $p -match '(\d+)\.(\d+)'
    if(-not $m) {
      Write-Host "!!! Cannot determine version" -ForegroundColor red
      Set-Location -Path $current_dir
      Exit-WithCode 1
    }
    # We are supporting python 3.6 and up
    if(($matches[1] -lt 3) -or ($matches[2] -lt 7)) {
      Write-Host "FAILED Version [ $p ] is old and unsupported" -ForegroundColor red
      Set-Location -Path $current_dir
      Exit-WithCode 1
    }
    Write-Host "OK [ $p ]" -ForegroundColor green
}


$current_dir = Get-Location
$script_dir = Split-Path -Path $MyInvocation.MyCommand.Definition -Parent
$pype_root = (Get-Item $script_dir).parent.FullName

Set-Location -Path $pype_root

$art = @"


        ____________
       /\      ___  \
       \ \     \/_\  \
        \ \     _____/ ______   ___ ___ ___
         \ \    \___/ /\     \  \  \\  \\  \
          \ \____\    \ \_____\  \__\\__\\__\
           \/____/     \/_____/  . PYPE Club .

"@

Write-Host $art -ForegroundColor DarkGreen

# Enable if PS 7.x is needed.
# Show-PSWarning

$version_file = Get-Content -Path "$($pype_root)\pype\version.py"
$result = [regex]::Matches($version_file, '__version__ = "(?<version>\d+\.\d+.\d+.*)"')
$pype_version = $result[0].Groups['version'].Value
if (-not $pype_version) {
  Write-Host "!!! " -ForegroundColor yellow -NoNewline
  Write-Host "Cannot determine Pype version."
  Set-Location -Path $current_dir
  Exit-WithCode 1
}
Write-Host ">>> " -NoNewline -ForegroundColor Green
Write-Host "Found Pype version " -NoNewline
Write-Host "[ $($pype_version) ]" -ForegroundColor Green

Test-Python

Write-Host ">>> " -NoNewline -ForegroundColor Green
Write-Host "Reading Poetry ... " -NoNewline
if (-not (Test-Path -PathType Container -Path "$($env:USERPROFILE)\.poetry\bin")) {
    Write-Host "NOT FOUND" -ForegroundColor Yellow
    Install-Poetry
    Write-Host "INSTALLED" -ForegroundColor Cyan
} else {
    Write-Host "OK" -ForegroundColor Green
}

if (-not (Test-Path -PathType Leaf -Path "$($pype_root)\poetry.lock")) {
    Write-Host ">>> " -NoNewline -ForegroundColor green
    Write-Host "Installing virtual environment and creating lock."
} else {
    Write-Host ">>> " -NoNewline -ForegroundColor green
    Write-Host "Installing virtual environment from lock."
}
& poetry install $poetry_verbosity
if ($LASTEXITCODE -ne 0) {
    Write-Host "!!! " -ForegroundColor yellow -NoNewline
    Write-Host "Poetry command failed."
    Set-Location -Path $current_dir
    Exit-WithCode 1
}
Set-Location -Path $current_dir
Write-Host ">>> " -NoNewline -ForegroundColor green
Write-Host "Virtual environment created. "