name: update MITRE ATT&CK remap table

on:
  schedule:
    # ATT&CK ships twice a year plus occasional Agile releases, so check monthly.
    - cron: '0 21 2 * *'
  workflow_dispatch:

permissions:
  contents: write
  pull-requests: write

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout self repository
        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2

      - name: Set up Python
        uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6.3.0
        with:
          python-version: '3.12'

      - name: Regenerate the remap block in WELA.ps1
        run: python3 tools/update_attack_remap.py WELA.ps1

      - name: Verify WELA.ps1 still parses
        shell: pwsh
        run: |
          $errors = $null
          $tokens = $null
          [void][System.Management.Automation.Language.Parser]::ParseFile(
            (Resolve-Path ./WELA.ps1), [ref]$tokens, [ref]$errors)
          if ($errors) {
            $errors | ForEach-Object { Write-Host $_.Message }
            exit 1
          }
          Write-Host 'WELA.ps1 parsed successfully'

      - name: Check for changes
        id: check
        run: |
          if [ -n "$(git status --porcelain WELA.ps1)" ]; then
            echo "change_exist=true" >> $GITHUB_ENV
            echo "action_date=$(date '+%Y-%m-%d  %H:%M:%S')" >> $GITHUB_ENV
          else
            echo "change_exist=false" >> $GITHUB_ENV
          fi

      - name: Create Pull Request
        if: env.change_exist == 'true'
        id: cpr
        uses: peter-evans/create-pull-request@5f6978faf089d4d20b00c7766989d076bb2fc7f1 # v8.1.1
        with:
          token: ${{ secrets.GITHUB_TOKEN }}
          commit-message: Update MITRE ATT&CK remap table (${{ env.action_date }})
          branch: attack/auto-remap-update
          delete-branch: true
          title: '[Auto] MITRE ATT&CK remap table update (${{ env.action_date }})'
          branch-suffix: timestamp
          body: |
            Regenerated `$script:AttackTechniqueRemap` / `$script:AttackVersion` in `WELA.ps1`
            from the latest Enterprise ATT&CK release.

            If `$script:AttackVersion` changed, the ATT&CK major version has moved. Re-check the
            heatmap in ATT&CK Navigator and refresh `screenshots/mitre.png` before merging.