param(
  $stage = 3
)
$myRoot = $PSScriptRoot

$llvm_ver = '15.0.7'

$AX_ROOT = (Resolve-Path $myRoot/../..).Path

$succeed = $true
if (($stage -band 1)) {
    # ensure prebuilt lib downloaded
    Push-Location $AX_ROOT
    $build_script = Join-Path $AX_ROOT 'build.ps1'
    &$build_script -c
    Pop-Location

    (Get-Command python.exe).Path

    pip install PyYAML Cheetah3

    ## setup ndk
    $setup_script = (Resolve-Path $AX_ROOT/setup.ps1).Path

    echo "before setup py_ver: $(python -V), PATH=$env:PATH"
    . $setup_script -p android
    echo "after setup py_ver: $(python -V), PATH=$env:PATH"

    echo "$ndk_root=$ndk_root"

    $prefix = Join-Path $AX_ROOT 'cache'
    $llvm_out = Join-Path $prefix "llvmorg-$llvm_ver.zip"

    ## download win64 libclang.dll 
    $b1k.mkdirs($prefix)
    download_and_expand -url "https://github.com/simdsoft/1kiss/releases/download/llvmorg-$llvm_ver/llvmorg-$llvm_ver.zip" -out "$llvm_out" -dest $prefix
    Copy-Item "$prefix/llvmorg-$llvm_ver/llvm/prebuilt/windows/x64/libclang.dll" -Destination "$AX_ROOT/tools/bindings-generator/libclang"

    ## ensure $env:AX_ROOT/core/axmolver.h exists
    echo "AX_ROOT=$AX_ROOT"
    if (!(Test-Path "$AX_ROOT/core/axmolver.h" -PathType Leaf)) {
        $content = [System.IO.File]::ReadAllText("$AX_ROOT/core/axmolver.h.in")
        $content = $content.Replace('@AX_GIT_PRESENT@', '0')
        [System.IO.File]::WriteAllText("$AX_ROOT/core/axmolver.h")
    }

    ## run genbindings.py
    Push-Location $AX_ROOT/tools/tolua

    python genbindings.py --ndk_root "$ndk_root"
    $succeed = $?

    Pop-Location
}

# strip empty lines
if ($stage -band 2) {
    echo 'Stripping header empty lines ...'
    $UTF8Encoding = [System.Text.Encoding]::UTF8
    $eol = $UTF8Encoding.GetBytes("`n")
    $autogen_dir = Join-Path $AX_ROOT 'extensions/scripting/lua-bindings/auto/*.hpp'
    $header_files = Get-ChildItem $autogen_dir
    
    foreach($file in $header_files) {
        $file_path = "$file"
        $code_lines =  Get-Content $file_path
        $fs = [System.IO.File]::Open($file_path, [System.IO.FileMode]::Truncate)
        $empty_lines = 0
        $write_lines = 0
        foreach($line in $code_lines) {
            if ($line) {
                ++$write_lines
                $buf = $UTF8Encoding.GetBytes($line)
                $fs.Write($buf, 0, $buf.Length)
                $fs.Write($eol, 0, $eol.Length)
            } else {
                ++$empty_lines
            }
        }

        # $fs.Write($eol, 0, $eol.Length)
        $fs.Dispose()
        
        echo "Removed $empty_lines empty lines for file $file_path, valid lines: $write_lines"
    }
}

# check modified files
Push-Location $AX_ROOT
if ($succeed -and $env:GITHUB_ACTIONS -eq 'true') {
    $git_status = "$(git status)"
    $no_changes = $git_status.IndexOf('modified:') -eq -1 # -and $git_status.IndexOf('deleted:') -eq -1 -and $git_status.IndexOf('Untracked', [StringComparison]::OrdinalIgnoreCase) -eq -1
    if ($no_changes) {
        echo "BINDING_NO_CHANGES=true" >> ${env:GITHUB_ENV}
    } else {
        echo "LAST_COMMIT_HASH=$(git rev-parse --short=7 HEAD)" >> ${env:GITHUB_ENV}
    }
}
Pop-Location

if(!$succeed) {
    throw "Generating lua bindings fails"
}