# Specify the path to Texconv.exe
$texconvPath = "C:\path\to\texconv.exe"

# Path to the folder with DDS files
$sourceFolder = "C:\path\to\dds\files\Folder1"   # For example: C:\textures\Folder1
$outputFolder = "C:\path\to\output\folder"
$tempOutputFile = Join-Path -Path $outputFolder -ChildPath "temp_output.txt"  # Temporary file in the output folder

# Ensure the output folder exists
if (-not (Test-Path -Path $outputFolder)) {
    New-Item -Path $outputFolder -ItemType Directory
}

# Get all DDS files from the folder and subfolders
$ddsFiles = Get-ChildItem -Path $sourceFolder -Filter *.dds -Recurse

# File processing loop
foreach ($file in $ddsFiles) {
    # Get the filename without extension and convert it to lowercase
    $fileBaseName = [System.IO.Path]::GetFileNameWithoutExtension($file.Name).ToLower()

    # Check the current format using texconv and output it to a temporary file
    & $texconvPath -nologo -dx10 $file.FullName 2>&1 | Out-File -FilePath $tempOutputFile

    # Read the temp output file
    $formatCheckOutput = Get-Content $tempOutputFile

    # Find the line that starts with 'reading'
    $readingLine = $formatCheckOutput | Where-Object { $_ -like "reading*" }

    # Check if the reading line contains 'B8G8R8A8_UNORM'
    if ($readingLine -notlike "*B8G8R8A8_UNORM*") {
        Write-Host "Skipping file $file.Name: not in B8G8R8A8_UNORM format"
        continue  # Skip this file
    }

    # Calculate the relative path from the parent folder "Folder1" to the file
    $relativePath = $file.FullName.Substring((Get-Item $sourceFolder).Parent.FullName.Length).TrimStart('\')

    # Path to the output file (preserving the full folder structure)
    $outputFilePath = Join-Path -Path $outputFolder -ChildPath $relativePath
    $outputDir = Split-Path $outputFilePath -Parent

    # Ensure the output directory structure exists
    if (-not (Test-Path -Path $outputDir)) {
        New-Item -Path $outputDir -ItemType Directory -Force
    }

    # Determine which compression format to use
    if ($fileBaseName.EndsWith("_ma") -or $fileBaseName.EndsWith("_ct") -or $fileBaseName.EndsWith("_eg") -or $fileBaseName.EndsWith("_mb") -or $fileBaseName.EndsWith("_m")) {
        $compressionFormat = "BC3_UNORM"
    } else {
        $compressionFormat = "BC1_UNORM"
    }

    Write-Host "Processing file $file.Name with compression $compressionFormat"

    # Run texconv with the appropriate parameters and allow overwriting existing files
    & $texconvPath -f $compressionFormat -y -o $outputDir $file.FullName

    # Clean up any temporary DDS files accidentally saved near texconv.exe
    $tempDDSFile = Join-Path -Path (Split-Path $texconvPath -Parent) -ChildPath $file.Name
    if (Test-Path -Path $tempDDSFile) {
        Remove-Item -Path $tempDDSFile -Force
        Write-Host "Deleted temporary file: $tempDDSFile"
    }
}

# Delete the temporary output file if it exists
if (Test-Path -Path $tempOutputFile) {
    Remove-Item -Path $tempOutputFile -Force
    Write-Host "Deleted temporary output file: $tempOutputFile"
}

Write-Host "All files have been processed!"