#!/usr/bin/env pwsh

# save args and first parameter
$myArgs = $args.Clone()
$myArg1 = $args[0]

# setup for powershell version < 6.0
[bool] $myIsWindows = 0
[bool] $myIsMacOS = 0
if ( $IsWindows -eq $null ) {
  # for powershell version < 6.0 let's assume Windows
  $myIsWindows = 1
  $myIsMacOS = 0
} else {
  $myIsWindows = $IsWindows
  $myIsMacOS = $IsMacOS
}

# parent dir of this script (should be the getdown app dir). Follow symlinks.
$TARGET = ( Get-Item $MyInvocation.MyCommand.Path ).Target
$DIR = If ( $TARGET -eq $null -or $TARGET.LinkType -ne "SymbolicLink" ) { Split-Path $MyInvocation.MyCommand.Path -Parent } Else { Split-Path $TARGET -Parent }

# set the "-open" parameter if myArg1 is non-zero-length, and not "open" or starts with a "-"
$OPEN = ""
if ( $myArg1.length -gt 0 -and ( -not $myArg1.StartsWith("-") ) -and $myArg1 -cne "open" ) {
  $OPEN = "-open"
}

$APPDIR = $DIR
$JAVAEXE = If ( $myIsWindows ) { "java.exe" } Else { "java" }
$JAVA = Join-Path -Path $APPDIR -ChildPath ( "jre/" + $( If ( $myIsMacOS ) { "Contents/Home/" } Else { "" } ) + "bin/${JAVAEXE}" )
$GETDOWNTXT = Join-Path -Path $APPDIR -ChildPath "getdown.txt"

# look for getdown.txt -- needed to create classpath
if ( -not ( Test-Path -Path "${GETDOWNTXT}" ) ) {
  throw "Cannot find getdown.txt"
}

# look for bundled JRE. Might not be there if unix installer used in which case just invoke "java"
if ( -not ( Test-Path -Path "${JAVA}" ) ) {
  Write-Host "Cannot find bundled ${JAVAEXE}. Using system ${JAVAEXE} and hoping for the best!"
  $JAVA = $JAVAEXE
}

$CLASSPATH = ( Select-String -Path "${GETDOWNTXT}" -AllMatches -Pattern "code\s*=\s*(.*)$" | foreach { Join-Path -Path $APPDIR -ChildPath $($_.Matches.Groups[1].Value ) } ) -join $( If ( $myIsWindows ) { ";" } Else { ":" } )

# quote the args and the command (in case of spaces) with escape chars (`) and precede with & to indicate command not string
$myArgsString = '"' + $($myArgs -join '" "') + '"'
Invoke-Expression -Command "& `"${JAVA}`" -cp `"${CLASSPATH}`" jalview.bin.Launcher ${OPEN} ${myArgsString}"