name: Release

on:
  push:
    branches:
      - main

# Requires Forgejo v12+; older versions ignore this block.
concurrency:
  group: release
  cancel-in-progress: false

jobs:
  tag:
    runs-on: debian
    outputs:
      new_tag: ${{ steps.tag.outputs.new_tag }}
    steps:
      - uses: https://git.sbriggs.io/actions/checkout@f548e57e544e1ff5a4c46bf1e1b8685f8e4a348a
        with:
          fetch-depth: 0

      - name: Bump version and push tag
        id: tag
        shell: bash
        env:
          DEFAULT_BUMP: patch
        run: |
          set -euo pipefail
          git config user.name "forgejo-actions[bot]"
          git config user.email "forgejo-actions[bot]@noreply.localhost"

          # Already tagged? Reuse it instead of creating a duplicate.
          if existing=$(git describe --exact-match --tags HEAD 2>/dev/null); then
            echo "HEAD already tagged as $existing"
            echo "new_tag=$existing" >> "$GITHUB_OUTPUT"
            exit 0
          fi

          latest=$(git tag -l 'v[0-9]*' --sort=-v:refname | head -n1)
          if [ -z "$latest" ]; then
            major=0; minor=0; patch=0
            log=$(git log --pretty=%B)
          else
            ver=${latest#v}
            IFS=. read -r major minor patch <<< "$ver"
            log=$(git log --pretty=%B "$latest..HEAD")
          fi

          bump="$DEFAULT_BUMP"
          case "$log" in
            *'#major'*) bump=major ;;
            *'#minor'*) bump=minor ;;
            *'#patch'*) bump=patch ;;
          esac

          case "$bump" in
            major) major=$((major + 1)); minor=0; patch=0 ;;
            minor) minor=$((minor + 1)); patch=0 ;;
            patch) patch=$((patch + 1)) ;;
          esac

          new_tag="v${major}.${minor}.${patch}"
          echo "Bumping ${latest:-<none>} -> $new_tag ($bump)"

          git tag -a "$new_tag" -m "$new_tag"
          git push origin "$new_tag"
          echo "new_tag=$new_tag" >> "$GITHUB_OUTPUT"

  build-and-release:
    needs: tag
    runs-on: debian
    steps:
      #- uses: https://code.forgejo.org/actions/checkout@v4
      - uses: https://git.sbriggs.io/actions/checkout@f548e57e544e1ff5a4c46bf1e1b8685f8e4a348a
        with:
          fetch-depth: 0
          ref: ${{ needs.tag.outputs.new_tag }}

      - uses: https://code.forgejo.org/actions/setup-go@v5
        with:
          go-version-file: go.mod

      - name: Build release binaries
        run: make build

      - name: Compress Linux binaries
        run: upx --best --lzma dist/*-linux-*

      - name: Generate release notes
        id: notes
        shell: bash
        env:
          TAG: ${{ needs.tag.outputs.new_tag }}
        run: |
          set -euo pipefail
          prev=$(git tag -l 'v[0-9]*' --sort=-v:refname | grep -vFx "$TAG" | head -n1)
          if [ -n "$prev" ]; then
            range="$prev..$TAG"
            header="## Changes since $prev"
          else
            range="$TAG"
            header="## Changes"
          fi
          {
            echo "notes<<__EOF__"
            echo "$header"
            echo
            git log --no-merges --pretty='- %s (%h)' "$range"
            echo "__EOF__"
          } >> "$GITHUB_OUTPUT"

      - name: Publish Forgejo release
        uses: https://git.sbriggs.io/actions/forgejo-release@585a6614e80a6bcfc429b956ae34831889cabb78
        with:
          direction: upload
          url: ${{ github.server_url }}
          repo: ${{ github.repository }}
          tag: ${{ needs.tag.outputs.new_tag }}
          sha: ${{ github.sha }}
          token: ${{ secrets.GITHUB_TOKEN }}
          release-dir: dist
          release-notes: ${{ steps.notes.outputs.notes }}
          override: true
          verbose: true