[CmdletBinding()]
param(
    [string]$Range = 'HEAD^..HEAD'
)

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

$pattern = '^(build|chore|ci|docs|feat|fix|perf|refactor|revert|style|test)(\([a-z0-9][a-z0-9._/-]*\))?!?: .+$'
$lines = @(& git log --no-merges '--format=%H%x09%s' $Range)
if ($LASTEXITCODE -ne 0) {
    throw "Could not read commits for range '$Range'."
}

foreach ($line in $lines) {
    $fields = ([string]$line) -split "`t", 2
    if ($fields.Count -ne 2 -or -not [regex]::IsMatch($fields[1], $pattern)) {
        throw "Commit must use Conventional Commits: $line"
    }
}

Write-Host "Conventional Commit check passed for $($lines.Count) commit(s)."