## Define the tools and URLs to them
$URLS = @(
    'https://emberkom.s3.amazonaws.com/tools/LiquidFilesCLI.exe',
    'https://emberkom.s3.amazonaws.com/tools/7za.exe'
        )

## Test for write access to tools directory, redirect to AppData If denied
$TOOLS = "${Env:ProgramData}\Emberkom\Tools"
$TEST_FILE = "${TOOLS}\testfile.txt"

## Test to see if $TOOLS exists
If (!( Test-Path $TOOLS ))
{
    ## If $TOOLS does not exist, create it.
    Try { New-Item -ItemType Directory -Path $TOOLS }

    ## If we get an error, switch to the logged on user's AppData directory
    Catch
    {
        $TOOLS = "${Env:AppData}\Emberkom\Tools"
        If ( !(Test-Path $TOOLS) ) { New-Item -ItemType Directory -Path $TOOLS }
    }
}

## If $TOOLS already exists...
Else
{
    ## Try to create a file to make sure we have permission to modify the files in there
    Try
    {
        [IO.File]::OpenWrite($TEST_FILE).Close()
        If ( Test-Path $TEST_FILE ) { Remove-Item $TEST_FILE -Force }
    }
    
    ## If we get an error, switch to the logged on user's AppData directory
    Catch
    {
        $TOOLS = "${Env:AppData}\Emberkom\Tools"
        If ( !(Test-Path $TOOLS) ) { New-Item -ItemType Directory -Path $TOOLS }
    }
}

## Loop through each URL
ForEach ($url in $URLS) {
    ## Set the tool name based on the URL path
    $TOOL = $($url.Split('/') | Select-Object -Last 1)

    ## Delete any previous version of the tool
    If ( Test-Path "${TOOLS}\${TOOL}" )
    {
        Try { Remove-Item -Path "${TOOLS}\${TOOL}" }
        Catch { Write-Host "Could not delete ${TOOLS}\${TOOL}"; exit }
    }

    ## Download latest version of tool
    If ( !( Test-Path "${TOOLS}\${TOOL}" ))
    {
        Try { (New-Object System.Net.WebClient).DownloadFile($url,"${TOOLS}\${TOOL}") }
        Catch { Write-Host "Failed to download ${url}" }
    }
}