[CmdletBinding(SupportsShouldProcess = $true)]
param(
    [string]$Channel = "win-x64-stable",
    [string]$GiteaRepoUrl = "https://git.fristy.net/fristy/rgb-led-strip-controller",
    [string]$Tag = "",
    [string]$Token = $env:VPK_TOKEN,
    [string]$ExpectedTag = "",
    [switch]$Prerelease,
    [switch]$Merge
)

$ErrorActionPreference = "Stop"
Set-StrictMode -Version Latest

$repoRoot = [System.IO.Path]::GetFullPath((Join-Path $PSScriptRoot "..\.."))

if ([string]::IsNullOrWhiteSpace($Token)) {
    throw "Gitea token is required. Pass -Token or set the VPK_TOKEN environment variable."
}

function Assert-WorkspacePath {
    param([string]$Path)

    $fullPath = [System.IO.Path]::GetFullPath($Path)
    if (-not $fullPath.StartsWith($repoRoot, [System.StringComparison]::OrdinalIgnoreCase)) {
        throw "Refusing to use path outside workspace: $fullPath"
    }

    return $fullPath
}

function Get-GiteaReleaseTagNames {
    param(
        [string]$RepoUrl,
        [string]$AccessToken
    )

    $uri = [Uri]$RepoUrl
    $segments = $uri.AbsolutePath.Trim("/").Split("/") | Where-Object { -not [string]::IsNullOrWhiteSpace($_) }
    if ($segments.Count -lt 2) {
        throw "Could not parse owner/repo from GiteaRepoUrl: $RepoUrl"
    }

    $owner = $segments[-2]
    $repo = $segments[-1]
    $apiUrl = "{0}://{1}/api/v1/repos/{2}/{3}/releases?draft=false&limit=50" -f $uri.Scheme, $uri.Authority, $owner, $repo

    try {
        [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
        $headers = @{ Authorization = "token $AccessToken" }
        $releases = Invoke-RestMethod -Uri $apiUrl -Method Get -Headers $headers -ErrorAction Stop
    }
    catch {
        throw "Gitea releases could not be read: $apiUrl`n$($_.Exception.Message)"
    }

    return @($releases | ForEach-Object { $_.tag_name } | Where-Object { -not [string]::IsNullOrWhiteSpace($_) })
}

$releaseDir = Assert-WorkspacePath (Join-Path $repoRoot "artifacts\velopack\$Channel")
$manifestPath = Join-Path $releaseDir "releases.$Channel.json"

if (-not (Test-Path -LiteralPath $releaseDir)) {
    throw "Release directory not found: $releaseDir"
}

if (-not (Test-Path -LiteralPath $manifestPath)) {
    throw "Release manifest not found: $manifestPath"
}

$localManifest = Get-Content -Raw -LiteralPath $manifestPath | ConvertFrom-Json
if ($null -eq $localManifest.Assets -or $localManifest.Assets.Count -eq 0) {
    throw "Release manifest does not contain any assets: $manifestPath"
}

$packageId = $localManifest.Assets[0].PackageId
$localVersions = @(
    $localManifest.Assets |
        Where-Object { $_.PackageId -eq $packageId -and -not [string]::IsNullOrWhiteSpace($_.Version) } |
        ForEach-Object { [Version]$_.Version }
)
if ($localVersions.Count -eq 0) {
    throw "Could not determine local package version from: $manifestPath"
}

$localVersion = ($localVersions | Sort-Object -Descending | Select-Object -First 1)
$tag = if ([string]::IsNullOrWhiteSpace($Tag)) { "v$($localVersion.ToString())" } else { $Tag }

if (-not [string]::IsNullOrWhiteSpace($ExpectedTag) -and -not [string]::Equals($tag, $ExpectedTag, [System.StringComparison]::OrdinalIgnoreCase)) {
    throw "Derived tag $tag does not match expected tag $ExpectedTag. Check the pushed tag against the project version."
}

$setupFiles = @(Get-ChildItem -LiteralPath $releaseDir -Filter "*-Setup.exe" -File)
$portableFiles = @(Get-ChildItem -LiteralPath $releaseDir -Filter "*-Portable.zip" -File)
if ($setupFiles.Count -eq 0) {
    throw "No Setup.exe file found in release directory: $releaseDir"
}

if ($portableFiles.Count -eq 0) {
    throw "No Portable.zip file found in release directory: $releaseDir"
}

$existingTags = Get-GiteaReleaseTagNames -RepoUrl $GiteaRepoUrl -AccessToken $Token
if ($existingTags -contains $tag -and -not $Merge.IsPresent) {
    throw "Gitea already contains tag $tag. Upload is blocked (pass -Merge to merge into the existing release)."
}

$releaseUrl = $GiteaRepoUrl.TrimEnd("/") + "/releases/tag/" + $tag
$vpkArgs = @(
    "tool", "run", "vpk", "--",
    "upload", "gitea",
    "--outputDir", $releaseDir,
    "--channel", $Channel,
    "--repoUrl", $GiteaRepoUrl,
    "--token", $Token,
    "--tag", $tag,
    "--publish"
)
if ($Prerelease.IsPresent) {
    $vpkArgs += "--pre"
}

if ($Merge.IsPresent) {
    $vpkArgs += "--merge"
}

if ($PSCmdlet.ShouldProcess("$GiteaRepoUrl@$tag", "Upload Velopack release")) {
    & "dotnet" @vpkArgs
    if ($LASTEXITCODE -ne 0) {
        throw "vpk upload failed with exit code $LASTEXITCODE"
    }
}

Write-Host ""
Write-Host "Velopack feed upload complete." -ForegroundColor Green
Write-Host "Version:     $($localVersion.ToString())"
Write-Host "Tag:         $tag"
Write-Host "Channel:     $Channel"
Write-Host "ReleaseDir:  $releaseDir"
Write-Host "Release:     $releaseUrl"
Write-Host "Prerelease:  $(if ($Prerelease.IsPresent) { 'yes' } else { 'no' })"