Set-StrictMode -Version Latest
. "$PSScriptRoot\helpers.ps1"
. "$PSScriptRoot\process-zip.ps1"

$Settings = Import-Settings
$folder = $Settings.DownloadWatchFolder
$pattern = $Settings.ZipPattern

if (!(Test-Path $folder)) {
    Write-Log "DownloadWatchFolder does not exist: $folder" "ERROR"
    exit 1
}

Write-Log "Watching $folder for $pattern"

# Process anything already waiting.
& "$PSScriptRoot\run-once.ps1"

$watcher = New-Object System.IO.FileSystemWatcher
$watcher.Path = $folder
$watcher.Filter = $pattern
$watcher.IncludeSubdirectories = $false
$watcher.EnableRaisingEvents = $true

$action = {
    $path = $Event.SourceEventArgs.FullPath
    Start-Sleep -Seconds 1
    try {
        & $using:PSScriptRoot\process-zip.ps1 $path
    } catch {
        . "$using:PSScriptRoot\helpers.ps1"
        Write-Log "Watcher error for $path : $_" "ERROR"
    }
}

$created = Register-ObjectEvent -InputObject $watcher -EventName Created -Action $action
$changed = Register-ObjectEvent -InputObject $watcher -EventName Changed -Action $action
$renamed = Register-ObjectEvent -InputObject $watcher -EventName Renamed -Action $action

try {
    while ($true) {
        Start-Sleep -Seconds 5
    }
} finally {
    Unregister-Event -SourceIdentifier $created.Name -ErrorAction SilentlyContinue
    Unregister-Event -SourceIdentifier $changed.Name -ErrorAction SilentlyContinue
    Unregister-Event -SourceIdentifier $renamed.Name -ErrorAction SilentlyContinue
    $watcher.Dispose()
}