name: 'check-changes'
description: 'Checks for file changes in a specified path.'

inputs:
  base-commit:
    description: 'The commit hash to compare against. If not provided, the action will use HEAD^.'
    default: 'HEAD^'
  paths:
    description: 'A comma-separated list of file paths to check for changes. If any of these paths has changed files, the action will return true.'
    default: ''

outputs:
  has-changes:
    description: 'Indicates whether there are changes in the specified paths.'
    value: ${{ steps.check.outputs.has-changes }}


runs:
  using: 'composite'
  steps:
    - name: Check changes
      id: check
      shell: powershell
      run: |
        $hasChanges = $false
        $baseCommit = '${{ inputs.base-commit }}'

        if ($baseCommit -eq '0000000000000000000000000000000000000000') {
          Write-Host "Base commit is zero hash (merge commit or new branch). Define as always has changes."
          $hasChanges = $true
        }

        if (-not $hasChanges) {
          $diff = git diff --name-only $baseCommit HEAD
          $paths = '${{ inputs.paths }}' -split ',' | ForEach-Object { $_.Trim() }

          $diffChanges = $diff |
            Where-Object {
              foreach ($path in $paths) {
                if ($_.StartsWith($path)) {
                  return $true
                }
              }
            }

          $hasChanges = $diffChanges.Count -gt 0
        }

        Write-Output "OUT: has-changes=$($hasChanges)"
        Write-Output "has-changes=$($hasChanges)" | Add-Content -Path $env:GITHUB_OUTPUT