name: Release BIOS Packs

on:
  push:
    tags: ["v*"]
  workflow_dispatch:
    inputs:
      version:
        description: "Release version (e.g., v2.0.0)"
        required: true
  # Auto-release when update-db finishes (after BIOS push or platform update merge)
  workflow_run:
    workflows: ["Update Database"]
    types: [completed]
    branches: [main]

permissions:
  contents: write

jobs:
  check-changes:
    runs-on: ubuntu-latest
    # Skip auto-release if update-db failed or was triggered by release itself
    if: >
      github.event_name == 'push' ||
      github.event_name == 'workflow_dispatch' ||
      (github.event_name == 'workflow_run' && github.event.workflow_run.conclusion == 'success')
    outputs:
      should_release: ${{ steps.check.outputs.should_release }}
      version: ${{ steps.version.outputs.tag }}
    steps:
      - uses: actions/checkout@v6
        with:
          fetch-depth: 2

      - name: Check if BIOS files changed
        id: check
        run: |
          if [ "${{ github.event_name }}" = "workflow_run" ]; then
            # Auto-release: check if bios/ or platforms/ changed in the last commit
            changed=$(git diff --name-only HEAD~1 HEAD | grep -cE '^(bios/|platforms/)' || true)
            if [ "$changed" -gt 0 ]; then
              echo "should_release=true" >> "$GITHUB_OUTPUT"
            else
              echo "should_release=false" >> "$GITHUB_OUTPUT"
            fi
          else
            echo "should_release=true" >> "$GITHUB_OUTPUT"
          fi

      - name: Determine version
        id: version
        run: |
          if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
            echo "tag=${{ github.event.inputs.version }}" >> "$GITHUB_OUTPUT"
          elif [ "${{ github.event_name }}" = "push" ]; then
            echo "tag=${{ github.ref_name }}" >> "$GITHUB_OUTPUT"
          else
            # Auto-release: use date-based version
            echo "tag=auto-$(date +%Y%m%d)" >> "$GITHUB_OUTPUT"
          fi

  discover:
    needs: check-changes
    if: needs.check-changes.outputs.should_release == 'true'
    runs-on: ubuntu-latest
    outputs:
      platforms: ${{ steps.list.outputs.platforms }}
    steps:
      - uses: actions/checkout@v6

      - uses: actions/setup-python@v6
        with:
          python-version: "3.12"

      - name: List platforms
        id: list
        run: python scripts/list_platforms.py

  build:
    needs: [check-changes, discover]
    if: needs.check-changes.outputs.should_release == 'true'
    runs-on: ubuntu-latest
    strategy:
      matrix:
        platform: ${{ fromJson(needs.discover.outputs.platforms) }}
      fail-fast: false
      max-parallel: 10

    steps:
      - uses: actions/checkout@v6

      - uses: actions/setup-python@v6
        with:
          python-version: "3.12"

      - name: Install dependencies
        run: pip install pyyaml

      - name: Generate database (if not present)
        run: |
          if [ ! -f database.json ]; then
            python scripts/generate_db.py --bios-dir bios --output database.json
          fi

      - name: Generate pack for ${{ matrix.platform }}
        run: python scripts/generate_pack.py --platform ${{ matrix.platform }} --output-dir dist/

      - name: Upload artifact
        uses: actions/upload-artifact@v6
        with:
          name: pack-${{ matrix.platform }}
          path: dist/*.zip
          retention-days: 1

  publish:
    needs: [check-changes, discover, build]
    if: needs.check-changes.outputs.should_release == 'true'
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6

      - name: Download all pack artifacts
        uses: actions/download-artifact@v6
        with:
          path: dist/
          pattern: pack-*
          merge-multiple: true

      - name: Copy database.json
        run: cp database.json dist/database.json 2>/dev/null || true

      - uses: actions/setup-python@v6
        with:
          python-version: "3.12"

      - name: Install dependencies
        run: pip install pyyaml

      - name: Generate release notes
        id: notes
        run: |
          python3 << 'PYEOF'
          import json, os, subprocess, textwrap

          with open("database.json") as f:
              db = json.load(f)

          total = db["total_files"]
          size_mb = db["total_size"] / (1024 * 1024)
          date = db["generated_at"]

          packs = sorted(f for f in os.listdir("dist") if f.endswith(".zip"))
          pack_list = "\n".join(f"- **{p}** ({os.path.getsize(f'dist/{p}') / 1024 / 1024:.0f} MB)" for p in packs)

          # Get recent changes
          try:
              log = subprocess.run(
                  ["git", "log", "--oneline", "-20", "--no-merges", "--", "bios/", "platforms/"],
                  capture_output=True, text=True
              ).stdout.strip()
              changes = "\n".join(f"- {line}" for line in log.split("\n") if line) if log else "- Initial release"
          except Exception:
              changes = "- See commit history"

          notes = textwrap.dedent(f"""\
          {total} BIOS/firmware files, {size_mb:.0f} MB, 50+ systems, verified checksums.

          ### Packs
          {pack_list}

          ### Install
          Download, extract to your emulator's BIOS directory:

          | Platform | Path |
          |----------|------|
          | RetroArch / Lakka | `system/` |
          | Batocera | `/userdata/bios/` |
          | Recalbox | `/recalbox/share/bios/` |

          <details><summary>CLI & archived platforms</summary>

          ```bash
          # CLI download
          python scripts/download.py retroarch ~/RetroArch/system/

          # Archived platforms (RetroPie, etc.)
          git clone https://github.com/Abdess/retrobios.git
          cd retrobios && pip install pyyaml
          python scripts/generate_pack.py --platform retropie -o ~/Downloads/
          ```
          </details>

          ### Changes
          {changes}

          ---
          *{date} - [Full checksums & file listing](../../blob/main/README.md)*
          """)

          with open("/tmp/release_notes.md", "w") as f:
              f.write(notes)
          PYEOF

      - name: Create Release
        uses: softprops/action-gh-release@v2
        with:
          tag_name: ${{ needs.check-changes.outputs.version }}
          name: "BIOS Pack ${{ needs.check-changes.outputs.version }}"
          body_path: /tmp/release_notes.md
          files: dist/*
          fail_on_unmatched_files: false
          generate_release_notes: true
          make_latest: true