#-- defaults / parameters
[CmdletBinding()]            
Param(
  [string]$reinstall = "ask",
  [string]$TEMP = $env:TEMP,
  [string]$PYTHON = "C:\Python27",
  [string]$PythonGUID = "{4A656C6C-D24A-473F-9747-3A8D00907A03}", #Python 2.7.13
  [string]$StartMenu = "$env:USERPROFILE\AppData\Roaming\Microsoft\Windows\Start Menu\Programs",
 #[string]$UsrFolder = $MyInvocation.MyCommand.Path -replace ("([\\/][^\\/]+){4}$",""),
  [string]$ProgramFiles = "%ProgramFiles(x86)%",
  [string]$AboutLink = "http://freshcode.club/projects/streamtuner2",
  [string]$VERSION = "2.2.0"
)

    $ProgramFiles = "%ProgramFiles%"
}
New-Variable -Name STREAMRIPPER -Option AllScope -Value "$ProgramFiles\Streamripper" #can be changed in Check-Prerequisites

#-- what and how to install (hash list as used by Run-Task and Check-Prerequisites)
$tasks = @(
  @{
    title  = "Python 2.7.13"
    url    = "https://www.python.org/ftp/python/2.7.13/python-2.7.13.msi"
    cmd    = ""
    iargs   = 'TARGETDIR="{PYTHON}" /qb-!'
    regkey = "$regPathLM\$PythonGUID"
    testpth= "{PYTHON}\pythonw.exe"
    is_opt = ''
    prescn = ''
  },
  @{
    title  = "PyGtk 2.24.2"
    url    = "http://ftp.gnome.org/pub/GNOME/binaries/win32/pygtk/2.24/pygtk-all-in-one-2.24.2.win32-py2.7.msi"

    title  = "Streamripper 1.64.6"
    url    = "https://netcologne.dl.sourceforge.net/project/streamripper/streamripper%20%28current%29/1.64.6/streamripper-windows-installer-1.64.6.exe"
    cmd    = ""
    iargs   = "/S  /D={STREAMRIPPER}"  #NSIS does not use double quotes in /D parm
    regkey = "$regPathLM\Streamripper"
    testpth= "{STREAMRIPPER}\streamripper.exe"
    is_opt = '($optionalInstall)'     # ← could use '((Ask "Install streamripper too [y/N]") -match N)' instead
    prescn = 'if ($optionalInstall) {if ($t.found = (Get-ITPV "Streamripper")) {$STREAMRIPPER = $t.found}} else {$STREAMRIPPER=""; continue;}'
  },
  @{
    title  = "Mutagen (ID3-Support)"
    url    = "mutagen" # no download url
    cmd    = "pip"
    iargs   = "--disable-pip-version-check"
    testpth= "{PYTHON}\Lib\site-packages\mutagen-1*py2.7.egg-info"
    is_opt = '($optionalInstall)'     
    prescn = 'if ($optionalInstall) {if ($t.found = (test-path -path $t.testpth)) {$t.found = $t.testpth}} else {continue}'
  },
  @{
    title  = "Uninstall script"
    cmd    = 'Create-Uninstallscript'
  },
  @{
    title  = "Desktop shortcut"
    cmd    = 'Make-Shortcut @task'
       dir = "$Home\Desktop"
      name = "Streamtuner2.lnk"
    target = "$PYTHON\pythonw.exe"
       arg = "$UsrFolder\bin\streamtuner2"
  },
  @{
    title  = "Startmenu shortcut"
    cmd    = 'Make-Shortcut @task'
       dir = "$StartMenu\Streamtuner2"
      name = "Streamtuner2.lnk"
    target = "$PYTHON\pythonw.exe"
       arg = "$UsrFolder\bin\streamtuner2"
  },
  @{
    title  = "Startmenu help.chm"
    cmd    = 'Make-Shortcut @task'
       dir = "$StartMenu\Streamtuner2"
      name = "Help.lnk"
    target = "$UsrFolder\share\streamtuner2\help\help.chm"
  },
  @{
    title  = "Startmenu uninstall"
    cmd    = 'Make-Shortcut @task'
       dir = "$StartMenu\Streamtuner2"
      name = "Uninstall.lnk"
    target = "$UninstallPath"
  },
  @{
    title  = "Startmenu Internet"
    cmd    = 'Make-Shortcut @task'
       dir = "$StartMenu\Streamtuner2"
      name = "Streamtuner2 on the Web.lnk"
    target = "$AboutLink"
  },
  @{
    title  = "Startmenu Reconfigure"
    cmd    = 'Make-Shortcut @task'
       dir = "$StartMenu\Streamtuner2\Extra"
      name = "Reconfigure.lnk"
    target = "$ModifyPath"
  },
  @{
    title  = "Startmenu RunDebug"
    cmd    = 'Make-Shortcut @task'
       dir = "$StartMenu\Streamtuner2\Extra"
      name = "Run in debug mode (-D).lnk"
    target = "$PYTHON\python.exe"
       arg = "$UsrFolder\bin\streamtuner2"
      parm = "-D"
  },
  @{
    title  = "Startmenu RunConsole"
    cmd    = 'Make-Shortcut @task'
       dir = "$StartMenu\Streamtuner2\Extra"
      name = "Run with console.lnk"
    target = "$PYTHON\python.exe"
       arg = "$UsrFolder\bin\streamtuner2"
  },
  @{
    title  = "Startmenu ResetPrefs"
    cmd    = 'Make-Shortcut @task'
       dir = "$StartMenu\Streamtuner2\Extra"
      name = "Reset preferences.lnk"
    target = "$ResetPrefsPath"

|             __/\\\______\//\\\________\/\\\_________/\\\/___________        |
|              _\///\\\\\\\\\\\/_________\/\\\________/\\\\\\\\\\\\\\\_       |
|               ___\///////////___________\///________\///////////////__      |
|                                                                             |
|                                                                             |
|    Streamtuner2 for Windows                               Version $VERSION     |
|                                                                             |
|    Installer for Python 2.7.13 & Gtk 2.24.2                                 |
 ––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– 
"@
}
function Ask-First {
    Write-Host ""
    if ((Ask "Do you want to install Streamtuner2 and its Python dependencies now? [Y/n] ") -notmatch "^[yY]|^$") {
        #$tasks = $tasks[7..($tasks.length-1)]; return 0,0

    [CmdletBinding()]
    param()
    # update uninstall.cmd with current values
    $installFolder = $usrFolder.substring(0,$usrFolder.LastIndexOf('\'))
    $UninstallScript = Get-Content -Path $UninstallPath
    Out-File -FilePath $UninstallPath -Encoding ascii -InputObject @"
@set installFolder=$installFolder

@set Python=$PYTHON
@set StreamripperFolder=$STREAMRIPPER
"@
    $UninstallScript | %{if ($_ -notmatch "@set") {Out-File -FilePath $UninstallPath -Encoding ascii -Append -InputObject $_}} 
    # registry entry for ST2
    Remove-Item -Path $regPathCU\Streamtuner2 2> $null        
    New-Item $regPathCU -Name "Streamtuner2" > $null

    }
}

#-- Check if previous Python 2.7 installation exists
function Check-PythonInstall {
    $PythonInstalledPath = Get-ITPV('Python\PythonCore\2.7\InstallPath\')
    
    #-- if Python 2.7.13 installed, reuse installation folder
    if (Get-Item -path "$regPathLM\$PythonGUID" 2> $null ) {
        $PYTHON = $pythonInstalledPath -replace "\\$", ""
    }

    #-- older 2.7 version found
    else {
        if ($PythonInstalledPath) {
            Write-Host ""

#  · $prescn  → used in check-prereq()
#
filter Run-Task {
    # extract flags/vars from $tasks pipe
    $title=""; $cmd=""; $url=""; $iargs=""; $testpth=""; $regkey=""; $is_opt=""; $prescn=""; $found=""
    ($task = $_).GetEnumerator() | % { Set-Variable -Scope Local -Name $_.key -Value ([regex]::Replace($_.value, "[#{](\w+)[}#]", { param($m) Invoke-Expression ("$"+$m.Groups[1].Value) })) }

#    $iargs = $iargs -replace "{PYTHON}","$PYTHON"

    # skip optionals
    if ($is_opt -AND !(Invoke-Expression $is_opt)) { return }

    # print step
    if ($title -match "\d+\.\d+") { $title = "Installing $title" }
    Write-Host -b DarkBlue "`n $title `n"
    chdir($TEMP);

        $wget.DownloadFile($url, "$TEMP\$file");
    }

    # run shorthand or custom command
    if ($cmd) {
        if (Test-Path $PYTHON) { chdir($PYTHON) }
        if ($cmd -eq "pip") {
            if (!($file)) {
                $cmd = "& `"$PYTHON\Scripts\pip.exe`" install $url", $iargs
            }
            else {
                $cmd = "& `"$PYTHON\Scripts\pip.exe`" install $TEMP\$file", $iargs 
            }
        }
        elseif ($cmd -match "^(easy|easy_install|silent)$") {
            if (!($file)) {
                $cmd = "& `"$PYTHON\Scripts\easy_install.exe`" $url", $iargs 
            }
            else {
                $cmd = "& `"$PYTHON\Scripts\easy_install.exe`" $TEMP\$file", $iargs  
            }
        }
        Write-Host -f DarkGray " → $cmd"
        Invoke-Expression "$cmd"
    }
    # msi
    elseif ($file -match ".+.msi$") {