name: Semantic PR title

on:
  pull_request:
    types:
      - opened
      - edited
      - synchronize
      - labeled
      - unlabeled

jobs:
  semantic:
    runs-on: ubuntu-latest
    permissions:
      pull-requests: read
    steps:
      - uses: amannn/action-semantic-pull-request@e32d7e603df1aa1ba07e981f2a23455dee596825 # v5
        with:
          requireScope: true
          scopes: |
            app
            editor
            packages/excalidraw
            packages/utils
            docker
            repo
          ignoreLabels: |
            skip-semantic-title
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

  label-scope:
    needs: semantic
    if: github.event.pull_request.head.repo.full_name == github.repository
    runs-on: ubuntu-latest
    permissions:
      issues: write
      pull-requests: write
    steps:
      - name: Label scoped PR
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          PR_NUMBER: ${{ github.event.pull_request.number }}
          PR_TITLE: ${{ github.event.pull_request.title }}
          REPOSITORY: ${{ github.repository }}
        run: |
          set -euo pipefail

          scope_labels=(s-app s-editor s-package)

          readarray -t desired_labels < <(
            node <<'NODE'
          const title = process.env.PR_TITLE;
          const match = title.match(/^[a-z]+(?:\(([^)]+)\))?!?:/i);
          const scopes = match?.[1]?.split(",").map((scope) => scope.trim()) ?? [];
          const labels = new Set();

          for (const scope of scopes) {
            if (scope === "app") {
              labels.add("s-app");
            } else if (scope === "editor") {
              labels.add("s-editor");
            } else if (scope.startsWith("packages/")) {
              labels.add("s-package");
            }
          }

          process.stdout.write([...labels].join("\n"));
          NODE
          )

          should_apply_label() {
            local label="$1"

            for desired_label in "${desired_labels[@]}"; do
              if [[ "$desired_label" == "$label" ]]; then
                return 0
              fi
            done

            return 1
          }

          for label in "${scope_labels[@]}"; do
            if ! should_apply_label "$label"; then
              gh api \
                --method DELETE \
                "repos/${REPOSITORY}/issues/${PR_NUMBER}/labels/${label}" \
                --silent 2>/dev/null || true
            fi
          done

          for label in "${desired_labels[@]}"; do
            if ! gh api \
              --method POST \
              "repos/${REPOSITORY}/issues/${PR_NUMBER}/labels" \
              --field "labels[]=${label}" \
              --silent; then
              echo "::warning::Could not apply ${label}. The workflow token likely does not have issues:write permission for this PR."
            fi
          done