name: release

on:
  push:
    tags:
      - "v*"
  workflow_dispatch:

permissions:
  contents: write

jobs:
  release:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0
          fetch-tags: true

      - name: Generate changelog
        id: changelog
        run: |
          set -euo pipefail
          TAG="${GITHUB_REF_NAME}"
          REPO="${GITHUB_REPOSITORY}"

          # previous tag (parent of this tag)
          PREV_TAG="$(git describe --tags --abbrev=0 HEAD^ 2>/dev/null || echo "")"

          if [ -z "$PREV_TAG" ]; then
            RANGE="HEAD"
            echo "No previous tag, using all history"
          else
            RANGE="${PREV_TAG}..HEAD"
            echo "Range: $RANGE"
          fi

          FEATS=""
          FIXES=""

          # %H = hash, %s = subject (first line)
          while IFS= read -r line; do
            [ -z "$line" ] && continue
            sha="${line%% *}"
            subject="${line#* }"
            # match conventional commits: feat, fix (with optional scope and breaking !)
            if echo "$subject" | grep -qE '^(feat|fix)(\([^)]+\))?!?: '; then
              type="$(echo "$subject" | sed -E 's/^([a-z]+)(\([^)]+\))?!?:.*/\1/')"
              # strip type prefix for display, keep rest as title
              title="$(echo "$subject" | sed -E 's/^[a-z]+(\([^)]+\))?!?: //')"
              short="$(echo "$sha" | cut -c1-7)"
              url="https://github.com/${REPO}/commit/${sha}"
              entry="- ${title} ([\`${short}\`](${url}))"
              if [ "$type" = "feat" ]; then
                FEATS="${FEATS}${entry}"$'\n'
              elif [ "$type" = "fix" ]; then
                FIXES="${FIXES}${entry}"$'\n'
              fi
            fi
          done < <(git log "$RANGE" --format="%H %s" --no-merges)

          {
            echo "# ${TAG}"
            echo ""
            if [ -n "$FEATS" ]; then
              echo "## Features"
              echo ""
              printf "%s" "$FEATS"
              echo ""
            fi
            if [ -n "$FIXES" ]; then
              echo "## Fixes"
              echo ""
              printf "%s" "$FIXES"
              echo ""
            fi
            if [ -z "$FEATS" ] && [ -z "$FIXES" ]; then
              echo "_No relevant conventional commits (feat/fix) in this release._"
              echo ""
            fi
            echo "---"
            echo ""
            if [ -n "$PREV_TAG" ]; then
              echo "**Full diff:** [\`${PREV_TAG}...${TAG}\`](https://github.com/${REPO}/compare/${PREV_TAG}...${TAG})"
            else
              echo "**Full history up to ${TAG}**"
            fi
          } > /tmp/notes.md

          cat /tmp/notes.md
          # multiline output for next step
          {
            echo "notes<<EOF"
            cat /tmp/notes.md
            echo "EOF"
          } >> "$GITHUB_OUTPUT"

      - name: Create GitHub Release
        uses: softprops/action-gh-release@v2
        with:
          tag_name: ${{ github.ref_name }}
          name: ${{ github.ref_name }}
          body: ${{ steps.changelog.outputs.notes }}
          generate_release_notes: false