$ErrorActionPreference = 'Stop'

$ScriptDir = Split-Path -Parent $MyInvocation.MyCommand.Path
$Root = Split-Path -Parent $ScriptDir
$SingBox = Join-Path $Root 'works/sing-box'
$RevFile = Join-Path $Root 'works/rev'

# defaults
$RepoUrl = 'https://git.sfclub.cc/icybear/sing-box.git'
$UpstreamBranch = 'main'

$ConfigFile = Join-Path $Root 'works/config'
if (Test-Path $ConfigFile) {
    Get-Content $ConfigFile | ForEach-Object {
        if ($_ -match '^([^#=]+)=(.*)$') {
            $key = $Matches[1].Trim()
            $val = $Matches[2].Trim()
            if ($key -eq 'REPO_URL') { $RepoUrl = $val }
            elseif ($key -eq 'UPSTREAM_BRANCH') { $UpstreamBranch = $val }
        }
    }
}

if (Test-Path (Join-Path $SingBox '.git')) {
    Write-Host 'Updating sing-box...'
    git -C $SingBox fetch --all
    if ($UpstreamBranch) { git -C $SingBox checkout $UpstreamBranch }
    git -C $SingBox pull
} else {
    Write-Host 'Cloning sing-box...'
    if ($UpstreamBranch) {
        git clone -b $UpstreamBranch $RepoUrl $SingBox
    } else {
        git clone $RepoUrl $SingBox
    }
}

$Rev = git -C $SingBox rev-parse HEAD
Set-Content -Path $RevFile -Value $Rev -NoNewline

$version = git -C $SingBox describe --tags --always 2>$null
if (-not $version) { $version = $Rev.Substring(0, 7) }
Write-Host "Done. Version: $version"
Write-Host "Stored rev: $Rev"