name: release
on:
  workflow_run:
    workflows: [test]
    branches: [master]
    types: [completed]

jobs:
  release:
    runs-on: ubuntu-20.04

    # need to manually check for a couple things
    # - tests passed?
    # - we are the most recent commit on master?
    if: ${{github.event.workflow_run.conclusion == 'success' &&
      github.event.workflow_run.head_sha == github.sha}}

    steps:
      - uses: actions/checkout@v2
        with:
          ref: ${{github.event.workflow_run.head_sha}}
          # need workflow access since we push branches
          # containing workflows
          token: ${{secrets.BOT_TOKEN}}
          # need all tags
          fetch-depth: 0

      # try to get results from tests
      - uses: dawidd6/action-download-artifact@v2
        continue-on-error: true
        with:
          workflow: ${{github.event.workflow_run.name}}
          run_id: ${{github.event.workflow_run.id}}
          name: results
          path: results

      - name: find-version
        run: |
          # rip version from lfs.h
          LFS_VERSION="$(grep -o '^#define LFS_VERSION .*$' lfs.h \
            | awk '{print $3}')"
          LFS_VERSION_MAJOR="$((0xffff & ($LFS_VERSION >> 16)))"
          LFS_VERSION_MINOR="$((0xffff & ($LFS_VERSION >>  0)))"

          # find a new patch version based on what we find in our tags
          LFS_VERSION_PATCH="$( \
            ( git describe --tags --abbrev=0 \
                --match="v$LFS_VERSION_MAJOR.$LFS_VERSION_MINOR.*" \
              || echo 'v0.0.-1' ) \
            | awk -F '.' '{print $3+1}')"

          # found new version
          LFS_VERSION="v$LFS_VERSION_MAJOR`
            `.$LFS_VERSION_MINOR`
            `.$LFS_VERSION_PATCH"
          echo "LFS_VERSION=$LFS_VERSION"
          echo "LFS_VERSION=$LFS_VERSION" >> $GITHUB_ENV
          echo "LFS_VERSION_MAJOR=$LFS_VERSION_MAJOR" >> $GITHUB_ENV
          echo "LFS_VERSION_MINOR=$LFS_VERSION_MINOR" >> $GITHUB_ENV
          echo "LFS_VERSION_PATCH=$LFS_VERSION_PATCH" >> $GITHUB_ENV

      # try to find previous version?
      - name: find-prev-version
        continue-on-error: true
        run: |
          LFS_PREV_VERSION="$(git describe --tags --abbrev=0 --match 'v*')"
          echo "LFS_PREV_VERSION=$LFS_PREV_VERSION"
          echo "LFS_PREV_VERSION=$LFS_PREV_VERSION" >> $GITHUB_ENV

      # try to find results from tests
      - name: collect-results
        run: |
          # previous results to compare against?
          [ -n "$LFS_PREV_VERSION" ] && curl -sS \
            "$GITHUB_API_URL/repos/$GITHUB_REPOSITORY/`
              `status/$LFS_PREV_VERSION?per_page=100" \
            | jq -re 'select(.sha != env.GITHUB_SHA) | .statuses[]' \
            >> prev-results.json \
            || true

          # build table for GitHub
          echo "<table>" >> results.txt
          echo "<thead>" >> results.txt
          echo "<tr>" >> results.txt
          echo "<th align=left>Configuration</th>" >> results.txt
          for r in Code Stack Structs Coverage
          do
            echo "<th align=right>$r</th>" >> results.txt
          done
          echo "</tr>" >> results.txt
          echo "</thead>" >> results.txt

          echo "<tbody>" >> results.txt
          for c in "" readonly threadsafe migrate error-asserts
          do
            echo "<tr>" >> results.txt
            c_or_default=${c:-default}
            echo "<td align=left>${c_or_default^}</td>" >> results.txt
            for r in code stack structs
            do
              # per-config results
              echo "<td align=right>" >> results.txt
              [ -e results/thumb${c:+-$c}.csv ] && ( \
                export PREV="$(jq -re '
                      select(.context == "'"results (thumb${c:+, $c}) / $r"'").description
                      | capture("(?<result>[0-9∞]+)").result' \
                    prev-results.json || echo 0)"
                ./scripts/summary.py results/thumb${c:+-$c}.csv -f $r -Y | awk '
                  NR==2 {printf "%s B",$2}
                  NR==2 && ENVIRON["PREV"]+0 != 0 {
                    printf " (%+.1f%%)",100*($2-ENVIRON["PREV"])/ENVIRON["PREV"]}
                  NR==2 {printf "\n"}' \
                | sed -e 's/ /\&nbsp;/g' \
                >> results.txt)
              echo "</td>" >> results.txt
            done
            # coverage results
            if [ -z $c ]
            then
              echo "<td rowspan=0 align=right>" >> results.txt
              [ -e results/coverage.csv ] && ( \
                export PREV="$(jq -re '
                      select(.context == "results / coverage").description
                      | capture("(?<result>[0-9\\.]+)").result' \
                    prev-results.json || echo 0)"
                ./scripts/coverage.py -u results/coverage.csv -Y | awk -F '[ /%]+' '
                  NR==2 {printf "%.1f%% of %d lines",$4,$3}
                  NR==2 && ENVIRON["PREV"]+0 != 0 {
                    printf " (%+.1f%%)",$4-ENVIRON["PREV"]}
                  NR==2 {printf "\n"}' \
                | sed -e 's/ /\&nbsp;/g' \
                >> results.txt)
              echo "</td>" >> results.txt
            fi
            echo "</tr>" >> results.txt
          done
          echo "</tbody>" >> results.txt
          echo "</table>" >> results.txt

          cat results.txt

      # find changes from history
      - name: collect-changes
        run: |
          [ -n "$LFS_PREV_VERSION" ] || exit 0
          # use explicit link to github commit so that release notes can
          # be copied elsewhere
          git log "$LFS_PREV_VERSION.." \
            --grep='^Merge' --invert-grep \
            --format="format:[\`%h\`](`
              `https://github.com/$GITHUB_REPOSITORY/commit/%h) %s" \
            > changes.txt
          echo "CHANGES:"
          cat changes.txt

      # create and update major branches (vN and vN-prefix)
      - name: create-major-branches
        run: |
          # create major branch
          git branch "v$LFS_VERSION_MAJOR" HEAD

          # create major prefix branch
          git config user.name ${{secrets.BOT_USER}}
          git config user.email ${{secrets.BOT_EMAIL}}
          git fetch "https://github.com/$GITHUB_REPOSITORY.git" \
            "v$LFS_VERSION_MAJOR-prefix" || true
          ./scripts/prefix.py "lfs$LFS_VERSION_MAJOR"
          git branch "v$LFS_VERSION_MAJOR-prefix" $( \
            git commit-tree $(git write-tree) \
              $(git rev-parse --verify -q FETCH_HEAD | sed -e 's/^/-p /') \
              -p HEAD \
              -m "Generated v$LFS_VERSION_MAJOR prefixes")
          git reset --hard

          # push!
          git push --atomic origin \
            "v$LFS_VERSION_MAJOR" \
            "v$LFS_VERSION_MAJOR-prefix"

      # build release notes
      - name: create-release
        run: |
          # create release and patch version tag (vN.N.N)
          # only draft if not a patch release
          [ -e results.txt ] && export RESULTS="$(cat results.txt)"
          [ -e changes.txt ] && export CHANGES="$(cat changes.txt)"
          curl -sS -X POST -H "authorization: token ${{secrets.BOT_TOKEN}}" \
            "$GITHUB_API_URL/repos/$GITHUB_REPOSITORY/releases" \
            -d "$(jq -n '{
              tag_name: env.LFS_VERSION,
              name: env.LFS_VERSION | rtrimstr(".0"),
              target_commitish: "${{github.event.workflow_run.head_sha}}",
              draft: env.LFS_VERSION | endswith(".0"),
              body: [env.RESULTS, env.CHANGES | select(.)] | join("\n\n")}' \
              | tee /dev/stderr)"