name: 🚀 Release

# Manual only — run this deliberately after build and sign are confirmed good.
# Provide the exact version tag and the sign.yml run ID to pull artifacts from.
on:
  workflow_dispatch:
    inputs:
      version:
        description: 'Release version tag (e.g. v1.2.4) — must not already exist'
        required: true
        type: string
      sign_run_id:
        description: 'sign.yml run ID to pull signatures and PDFs from'
        required: true
        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
    runs-on: ubuntu-latest

    steps:
      - name: 🛠️ Checkout (for tags and pgp/)
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          sparse-checkout: pgp

      # ------------------------------------------------------------------ #
      #  Download artifacts from the specified sign run
      # ------------------------------------------------------------------ #
      - name: 📥 Download signatures artifact
        uses: actions/download-artifact@v4
        with:
          name:         signatures
          path:         release/
          run-id:       ${{ inputs.sign_run_id }}
          github-token: ${{ secrets.GITHUB_TOKEN }}

      - name: 📥 Download signed PDFs artifact
        uses: actions/download-artifact@v4
        with:
          name:         pdfs-signed
          path:         release/
          run-id:       ${{ inputs.sign_run_id }}
          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
      # ------------------------------------------------------------------ #
      - 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 "")
          if [ -n "$light_hash" ]; then
            echo "light_vt=https://www.virustotal.com/gui/file/${light_hash}" >> $GITHUB_OUTPUT
          else
            echo "light_vt=(not built)" >> $GITHUB_OUTPUT
          fi
          if [ -n "$dark_hash" ]; then
            echo "dark_vt=https://www.virustotal.com/gui/file/${dark_hash}" >> $GITHUB_OUTPUT
          else
            echo "dark_vt=(not built)" >> $GITHUB_OUTPUT
          fi

      # ------------------------------------------------------------------ #
      #  Validate explicit version input — refuse to auto-increment or
      #  overwrite an existing tag
      # ------------------------------------------------------------------ #
      - name: 🏷️ Validate release tag
        id: tag
        run: |
          git fetch --tags --quiet
          VERSION="${{ inputs.version }}"

          # Enforce vX.Y.Z format
          if ! echo "$VERSION" | grep -qE '^v[0-9]+\.[0-9]+\.[0-9]+$'; then
            echo "::error::Version '$VERSION' is not valid semver. Use format: v1.2.3"
            exit 1
          fi

          # Refuse to overwrite an existing tag
          if git tag --list | grep -qx "$VERSION"; then
            echo "::error::Tag '$VERSION' already exists. Bump the version."
            exit 1
          fi

          echo "tag=$VERSION"  >> $GITHUB_OUTPUT
          echo "name=$VERSION" >> $GITHUB_OUTPUT
          echo "Tag: $VERSION"

      # ------------------------------------------------------------------ #
      #  Create GitHub Release
      # ------------------------------------------------------------------ #
      - 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)
            ```text
            SHA-256  ${{ steps.hashes.outputs.light_sha256 }}
            BLAKE2b  ${{ steps.hashes.outputs.light_b2 }}
            ```

            **thgtoa-dark.pdf** (dark)
            ```text
            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