name: Regenerate TOC
on:
  repository_dispatch:
    types: [regenerate-toc-command]
jobs:
  regenerate-toc:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout PR branch
        uses: actions/checkout@v4
        with:
          token: ${{ secrets.SLANGBOT_PAT }}
          repository: ${{ github.event.client_payload.pull_request.head.repo.full_name }}
          ref: ${{ github.event.client_payload.pull_request.head.ref }}
          path: pr-branch

      - name: Checkout target branch
        uses: actions/checkout@v4
        with:
          token: ${{ secrets.SLANGBOT_PAT }}
          repository: ${{ github.event.client_payload.pull_request.base.repo.full_name }}
          ref: ${{ github.event.client_payload.pull_request.base.ref }}
          path: target-branch

      - name: Install Mono
        run: |
          sudo apt-get update
          sudo apt-get install -y mono-complete

      - name: Regenerate Table of Contents
        id: regen
        run: |
          ./target-branch/docs/build_toc.sh --source ./pr-branch

      - name: Configure Git commit signing
        id: git-info
        run: |
          echo "${{ secrets.SLANGBOT_SIGNING_KEY }}" > "${{runner.temp}}"/signing_key
          chmod 600 "${{runner.temp}}"/signing_key
          git -C pr-branch config commit.gpgsign true
          git -C pr-branch config gpg.format ssh
          git -C pr-branch config user.signingkey "${{runner.temp}}"/signing_key
          bot_info=$(curl -s -H "Authorization: Bearer ${{ secrets.SLANGBOT_PAT }}" \
            "https://api.github.com/user")
          echo "bot_identity=$(echo $bot_info | jq --raw-output '.login + " <" + (.id|tostring) + "+" + .login + "@users.noreply.github.com>"')" >> $GITHUB_OUTPUT
          echo "bot_name=$(echo $bot_info | jq --raw-output '.login')" >> $GITHUB_OUTPUT

      - name: Create Pull Request
        id: create-pr
        uses: peter-evans/create-pull-request@v7
        with:
          token: ${{ secrets.SLANGBOT_PAT }}
          path: pr-branch
          commit-message: "regenerate documentation Table of Contents"
          title: "Regenerate documentation ToC for PR #${{ github.event.client_payload.pull_request.number }}"
          body: "Automated ToC generation for ${{ github.event.client_payload.pull_request.html_url }}"
          committer: ${{ steps.git-info.outputs.bot_identity }}
          author: ${{ steps.git-info.outputs.bot_identity }}
          branch: regenerate-toc-${{ github.event.client_payload.pull_request.number }}-${{ github.event.client_payload.pull_request.head.ref }}
          base: ${{ github.event.client_payload.pull_request.head.ref }}
          push-to-fork: ${{ steps.git-info.outputs.bot_name }}/slang
          delete-branch: true

      - name: Comment on PR
        uses: peter-evans/create-or-update-comment@v4
        if: always()
        with:
          token: ${{ secrets.SLANGBOT_PAT }}
          repository: ${{ github.event.client_payload.github.payload.repository.full_name }}
          issue-number: ${{ github.event.client_payload.pull_request.number }}
          body: |
            ${{ 
              steps.regen.conclusion == 'failure'
              && format('❌ Table of Contents generation failed. Please check the [workflow run](https://github.com/{0}/actions/runs/{1})', github.repository, github.run_id)
              || (steps.create-pr.conclusion == 'failure' 
                  && format('❌ Failed to create regenerate ToC pull request. Please check the [workflow run](https://github.com/{0}/actions/runs/{1})', github.repository, github.run_id)
                  || format('🌈 Regenerated Table of Contents, please merge the changes from [this PR]({0})', steps.create-pr.outputs.pull-request-url))
            }}

      - name: Add reaction
        uses: peter-evans/create-or-update-comment@v4
        with:
          token: ${{ secrets.SLANGBOT_PAT }}
          repository: ${{ github.event.client_payload.github.payload.repository.full_name }}
          comment-id: ${{ github.event.client_payload.github.payload.comment.id }}
          reactions-edit-mode: replace
          reactions: hooray