[CmdletBinding()]
param(
    [Parameter(Mandatory = $true)]
    [ValidateNotNullOrEmpty()]
    [string]$Tag
)

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

function Test-SemVer {
    param(
        [Parameter(Mandatory = $true)]
        [string]$Version
    )

    $match = [regex]::Match(
        $Version,
        '^(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)(?:-([0-9A-Za-z-]+(?:\.[0-9A-Za-z-]+)*))?(?:\+([0-9A-Za-z-]+(?:\.[0-9A-Za-z-]+)*))?$'
    )
    if (-not $match.Success) {
        return $false
    }

    $preRelease = $match.Groups[4].Value
    return @($preRelease -split '\.' | Where-Object {
        $_ -match '^0\d+$'
    }).Count -eq 0
}

$workspaceRoot = Split-Path -Parent $PSScriptRoot
$cargoToml = Get-Content -Raw -LiteralPath (Join-Path $workspaceRoot 'Cargo.toml')
$match = [regex]::Match($cargoToml, '(?ms)^\[workspace\.package\].*?^version\s*=\s*"([^"]+)"')
if (-not $match.Success) {
    throw 'Could not resolve [workspace.package].version from Cargo.toml.'
}

$version = $match.Groups[1].Value
if (-not (Test-SemVer -Version $version)) {
    throw "Workspace version is not valid SemVer: $version"
}

if ($Tag -ne "v$version") {
    throw "Tag $Tag does not match workspace version v$version."
}

Write-Host "SemVer release tag verified: $Tag"