name: 🚀 Release

# Can be triggered:
#   1. Automatically after sign.yml completes on main
#   2. Manually, pointing at specific build/sign runs to pull artifacts from
on:
  workflow_run:
    workflows: ["🔏 Sign PDFs"]
    types: [completed]
    branches: [main]
  workflow_dispatch:
    inputs:
      sign_run_id:
        description: 'sign.yml run ID to pull signatures from'
        required: true
        type: string
      build_run_id:
        description: 'build.yml run ID to pull PDFs from (leave blank to use pdfs-signed from sign run)'
        required: false
        type: string
      prerelease:
        description: 'Mark as pre-release?'
        required: false
        default: false
        type: boolean

permissions:
  contents: write  # create releases and tags
  actions:  read   # download artifacts from other runs

jobs:
  release:
    name: Publish GitHub Release
    if: >
      github.event_name == 'workflow_dispatch' ||
      github.event.workflow_run.conclusion == 'success'
    runs-on: ubuntu-latest

    steps:
      - name: 🛠️ Checkout (for commit metadata only)
        uses: actions/checkout@v4
        with:
          sparse-checkout: pgp

      # ------------------------------------------------------------------ #
      #  Resolve which run IDs to pull artifacts from
      # ------------------------------------------------------------------ #
      - name: 🔍 Resolve run IDs
        id: runs
        run: |
          if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
            SIGN_RUN="${{ inputs.sign_run_id }}"
            BUILD_RUN="${{ inputs.build_run_id }}"
          else
            SIGN_RUN="${{ github.event.workflow_run.id }}"
            BUILD_RUN=""
          fi
          echo "sign_run=$SIGN_RUN"   >> $GITHUB_OUTPUT
          echo "build_run=$BUILD_RUN" >> $GITHUB_OUTPUT
          echo "Sign run:  $SIGN_RUN"
          echo "Build run: ${BUILD_RUN:-'(using pdfs-signed from sign run)'}"

      # ------------------------------------------------------------------ #
      #  Download artifacts
      # ------------------------------------------------------------------ #
      - name: 📥 Download signatures artifact
        uses: actions/download-artifact@v4
        with:
          name:         signatures
          path:         release/
          run-id:       ${{ steps.runs.outputs.sign_run }}
          github-token: ${{ secrets.GITHUB_TOKEN }}

      - name: 📥 Download PDFs (from sign run)
        uses: actions/download-artifact@v4
        with:
          name:         pdfs-signed
          path:         release/
          run-id:       ${{ steps.runs.outputs.sign_run }}
          github-token: ${{ secrets.GITHUB_TOKEN }}

      - name: 📋 List release assets
        run: ls -lh release/

      # ------------------------------------------------------------------ #
      #  Read hashes for the release body
      # ------------------------------------------------------------------ #
      - name: #️⃣ Read hashes
        id: hashes
        run: |
          read_hash() { cat "release/$1" 2>/dev/null || echo "(not built)"; }

          echo "light_sha256=$(read_hash thgtoa.pdf.sha256)"      >> $GITHUB_OUTPUT
          echo "dark_sha256=$(read_hash thgtoa-dark.pdf.sha256)"  >> $GITHUB_OUTPUT
          echo "light_b2=$(read_hash thgtoa.pdf.b2)"              >> $GITHUB_OUTPUT
          echo "dark_b2=$(read_hash thgtoa-dark.pdf.b2)"          >> $GITHUB_OUTPUT

      # ------------------------------------------------------------------ #
      #  VirusTotal — upload whichever PDFs are present
      # ------------------------------------------------------------------ #
      - name: 🦠 Upload PDFs to VirusTotal
        id: vt
        uses: crazy-max/ghaction-virustotal@v5
        with:
          vt_api_key: ${{ secrets.VT_API_KEY }}
          files: |
            release/thgtoa.pdf
            release/thgtoa-dark.pdf

      - name: 🔗 Build VT report URLs
        id: vt_urls
        run: |
          light_hash=$(cat release/thgtoa.pdf.sha256      2>/dev/null || echo "")
          dark_hash=$(cat  release/thgtoa-dark.pdf.sha256 2>/dev/null || echo "")
          [ -n "$light_hash" ] && \
            echo "light_vt=https://www.virustotal.com/gui/file/${light_hash}" >> $GITHUB_OUTPUT || \
            echo "light_vt=(not built)"                                        >> $GITHUB_OUTPUT
          [ -n "$dark_hash" ] && \
            echo "dark_vt=https://www.virustotal.com/gui/file/${dark_hash}" >> $GITHUB_OUTPUT || \
            echo "dark_vt=(not built)"                                       >> $GITHUB_OUTPUT

      # ------------------------------------------------------------------ #
      #  Tag + Release
      # ------------------------------------------------------------------ #
      - name: 🏷️ Generate release tag
        id: tag
        run: |
          TAG="v$(date -u +'%Y.%m.%d')-$(echo ${{ github.sha }} | cut -c1-7)"
          echo "tag=$TAG"                                           >> $GITHUB_OUTPUT
          echo "name=Release $(date -u +'%Y-%m-%d') (${TAG})"     >> $GITHUB_OUTPUT

      - name: 🚀 Create GitHub Release
        uses: softprops/action-gh-release@v2
        with:
          tag_name:   ${{ steps.tag.outputs.tag }}
          name:       ${{ steps.tag.outputs.name }}
          prerelease: ${{ inputs.prerelease || false }}
          draft:      false
          fail_on_unmatched_files: false
          body: |
            ## 📖 The Hitchhiker's Guide to Online Anonymity

            Built from [`${{ github.sha }}`](${{ github.server_url }}/${{ github.repository }}/commit/${{ github.sha }}) on `${{ github.ref_name }}`.

            ---

            ### 📄 Release assets

            | File | Description |
            |------|-------------|
            | `thgtoa.pdf` | Light mode PDF |
            | `thgtoa-dark.pdf` | Dark mode PDF (hacker theme) |
            | `sha256sums.txt` | SHA-256 checksums (both files) |
            | `b2sums.txt` | BLAKE2b checksums (both files) |
            | `thgtoa.pdf.sha256` | SHA-256 — light PDF |
            | `thgtoa-dark.pdf.sha256` | SHA-256 — dark PDF |
            | `thgtoa.pdf.b2` | BLAKE2b — light PDF |
            | `thgtoa-dark.pdf.b2` | BLAKE2b — dark PDF |
            | `*.sig` | GPG detached signatures (ASCII armor) |

            ---

            ### #️⃣ Hashes

            **thgtoa.pdf** (light)
            ```
            SHA-256  ${{ steps.hashes.outputs.light_sha256 }}
            BLAKE2b  ${{ steps.hashes.outputs.light_b2 }}
            ```

            **thgtoa-dark.pdf** (dark)
            ```
            SHA-256  ${{ steps.hashes.outputs.dark_sha256 }}
            BLAKE2b  ${{ steps.hashes.outputs.dark_b2 }}
            ```

            ---

            ### 🔏 Verifying GPG signatures

            ```bash
            # Import the release signing key
            gpg --import pgp/anonymousplanet-release.asc

            # Verify PDFs
            gpg --verify thgtoa.pdf.sig      thgtoa.pdf
            gpg --verify thgtoa-dark.pdf.sig thgtoa-dark.pdf

            # Verify hash files
            gpg --verify sha256sums.txt.sig sha256sums.txt
            gpg --verify b2sums.txt.sig     b2sums.txt
            ```

            ---

            ### 🦠 VirusTotal scans

            | File | Report |
            |------|--------|
            | `thgtoa.pdf` | ${{ steps.vt_urls.outputs.light_vt }} |
            | `thgtoa-dark.pdf` | ${{ steps.vt_urls.outputs.dark_vt }} |

          files: |
            release/thgtoa.pdf
            release/thgtoa-dark.pdf
            release/sha256sums.txt
            release/b2sums.txt
            release/thgtoa.pdf.sha256
            release/thgtoa-dark.pdf.sha256
            release/thgtoa.pdf.b2
            release/thgtoa-dark.pdf.b2
            release/thgtoa.pdf.sig
            release/thgtoa-dark.pdf.sig
            release/sha256sums.txt.sig
            release/b2sums.txt.sig