Add-Type -AssemblyName System.Runtime.WindowsRuntime

[Windows.Storage.StorageFile , Windows.Storage , ContentType=WindowsRuntime] > $null
[Windows.Media.Transcoding.MediaTranscoder, Windows.Media.Transcoding , ContentType=WindowsRuntime] > $null

#learn from https://fleexlab.blogspot.com/2018/02/using-winrts-iasyncoperation-in.html
Function await($WinRtTask, $ResultType = $null) {
    switch($ResultType.count){
        0{ $TaskType = 'IAsyncAction' }
        1{
            if ($ResultType -eq [double]){
                $TaskType = 'IAsyncActionWithProgress`1'
            }else{
                $TaskType = 'IAsyncOperation`1'
            }
        }
        2{ $TaskType = 'IAsyncOperationWithProgress`2'}
        default {throw '$ResultType error'}
    }

    $asTask = [System.WindowsRuntimeSystemExtensions].GetMethods() | ?{
        $_.Name -eq 'AsTask' -and
        $TaskType -eq $_.GetParameters().ParameterType.name}

    if ($ResultType.count -gt 0){
        $asTask = $asTask.MakeGenericMethod($ResultType)
    }

    $netTask = $asTask.Invoke($null, @($WinRtTask))
    $netTask.Wait(-1) | Out-Null
    if ($TaskType -like 'IAsyncOperation*'){
        $netTask.Result
    }
}

Function mp4Trim($mp4Path, $startTime = 0, $stopTime = 0, $musicOnly = $false){
   
    $transcoder = [Windows.Media.Transcoding.MediaTranscoder]::new()
    $startTime, $stopTime = $startTime, $stopTime -replace '^\d+$','0:0:$&' -replace '^\d+:\d+$','0:$&'
    $transcoder.TrimStartTime = $startTime
    $transcoder.TrimStopTime = $stopTime

    $a = [Windows.Storage.StorageFile]
    $mp4 = await ($a::GetFileFromPathAsync($mp4Path)) ($a)
    
    $a = [Windows.Media.MediaProperties.MediaEncodingProfile]
    $encProfile = await $a::CreateFromFileAsync($mp4) ($a)
    $mp4SaveName = $mp4.name

    if ($encProfile.video -ne $null -and $musicOnly){
        $q = [Windows.Media.MediaProperties.AudioEncodingQuality]::High
        $a = [Windows.Media.MediaProperties.MediaEncodingProfile]
        $ext = ''
        switch($encProfile.Audio.Subtype){
            'AAC'{$ext = 'm4a'}
            'MP3'{
                $ext = 'mp3'
                # if set to $flase, something error when listening to mp3
                $transcoder.AlwaysReencode = $true
            }
            'WMA9'{$ext = 'wma'}
        }

        if ($ext -ne ''){
            $musicProfile = $a::"Create$ext"($q)
            $musicProfile.Audio = $encProfile.Audio
            $encProfile = $musicProfile
            $mp4SaveName = $mp4.DisplayName + ".$ext"
        }
    }
    if ($encProfile.Audio.Subtype -eq 'WMA8'){$transcoder.AlwaysReencode = $true}

    $a =  [Windows.Storage.StorageFolder]
    $mp4Folder = await ($mp4.GetParentAsync()) ($a)

    $a = [Windows.Storage.StorageFile]
    # GenerateUniqueName=0; ReplaceExisting=1; FailIfExists=2; OpenIfExists=3 
    $mp4Save = await ($mp4Folder.CreateFileAsync($mp4SaveName, 0)) ($a)

    $a = [Windows.Media.Transcoding.PrepareTranscodeResult]
    $prepare = await ($transcoder.PrepareFileTranscodeAsync($mp4, $mp4Save, $encProfile)) ($a)

    if($prepare.CanTranscode){
        write-host "transcoding"
        await ($prepare.TranscodeAsync()) ([double])
        Write-Host "transcode complete"
        Write-Host 'wait 2 seconds for transcoder unlock'
        sleep 2
    }else{
        Write-Host "can't transcode"
    }

}
function mp4Property($mp4Path, $title = '', [uint32]$rating = 60, $comment = ''){

    $a = [Windows.Storage.StorageFile]
    $mp4 = await ($a::GetFileFromPathAsync($mp4Path)) ($a)

    $a = [Windows.Storage.FileProperties.VideoProperties]
    $videoP = await ($mp4.Properties.GetVideoPropertiesAsync()) ($a)
    # star   1..12    13..37   38..62   63..87   88..99 
    $videoP.Rating = $rating
    await $videoP.SavePropertiesAsync()

    $a = [Windows.Storage.FileProperties.DocumentProperties]
    $docP = await ($mp4.Properties.GetDocumentPropertiesAsync()) ($a)
    $docP.title = $title
    $docP.Comment = $comment
    await $docP.SavePropertiesAsync()

    <#

    $a = [Windows.Storage.FileProperties.ImageProperties]
    $imgP = await ($mp4.Properties.GetImagePropertiesAsync()) ($a)

    $a = [Windows.Storage.FileProperties.MusicProperties]
    $musicP = await ($mp4.Properties.GetMusicPropertiesAsync()) ($a)

    #all properties
    $videoP, $docP, $imgP, $musicP

    #properties (can set)
    $videoP, $docP, $imgP, $musicP | gm 'put_*' -Force
    
    #>

    <#
    
    # https://docs.microsoft.com/en-us/windows/win32/properties/props
    
    $a = [System.Collections.Generic.IDictionary[string, Object]]
    [string[]]$propNames = 'System.Title', 'System.Rating', 'System.Comment'
    await $mp4.Properties.RetrievePropertiesAsync($propNames) ($a) |%{
        "{0} : {1}" -f $_.Key, $_.Value
    }

    $s = 'System.Collections.Generic.KeyValuePair[string,System.Object]'
    $a = [type]$s
    $arr = @(
        $a::new('System.Title', $title),
        $a::new('System.Rating', $rating),
        $a::new('System.Comment', $comment)
    ) -as [type]"$s[]"

    await $mp4.Properties.SavePropertiesAsync($arr)
    
    #>
}

cd -literal $PSScriptRoot
[Environment]::CurrentDirectory = pwd

$files = @(dir *.mp4, *.mp3, *.m4a, *.wmv, *.wma -file)
if ($files.count -ne 0){
    # mp4Trim  filePath  startTime  stopTime  musicOnly
    mp4Trim  $files[0]  0:20  1:50

    # music only
    # mp4Trim  $files[0]  0:20  1:50  $true
    
    # music only & after 0:20
    # mp4Trim  $files[0]  0:20  0     $true
    
    # mp4Property  filePath  title  rating  comment
    # (1 ~ 5 star) rating  1..12    13..37   38..62   63..87   88..99 
    mp4Property $files[0] 'a title'  90  'a comment'
    
}
# When mp4 can't move or Rename , close PowerShell console
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