name: Create Release

on:
  push:
    tags:
      - "release/*/*/v*.*.*"

jobs:
  create-release:
    runs-on: ubuntu-latest
    permissions:
      contents: write
      pull-requests: read

    steps:
      - name: Checkout code
        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
        with:
          fetch-depth: 0
          persist-credentials: false

      - name: Extract tag information
        id: tag_info
        run: |
          TAG=${GITHUB_REF#refs/tags/}
          echo "tag=$TAG" >> $GITHUB_OUTPUT

          IFS='/' read -ra PARTS <<< "$TAG"
          NAMESPACE="${PARTS[1]}"
          MODULE="${PARTS[2]}"
          VERSION="${PARTS[3]}"

          echo "namespace=$NAMESPACE" >> $GITHUB_OUTPUT
          echo "module=$MODULE" >> $GITHUB_OUTPUT
          echo "version=$VERSION" >> $GITHUB_OUTPUT

          echo "module_path=registry/$NAMESPACE/modules/$MODULE" >> $GITHUB_OUTPUT

          RELEASE_TITLE="$NAMESPACE/$MODULE $VERSION"
          echo "release_title=$RELEASE_TITLE" >> $GITHUB_OUTPUT

      - name: Find previous tag
        id: prev_tag
        env:
          NAMESPACE: ${{ steps.tag_info.outputs.namespace }}
          MODULE: ${{ steps.tag_info.outputs.module }}
          CURRENT_TAG: ${{ steps.tag_info.outputs.tag }}
        run: |
          PREV_TAG=$(git tag -l "release/$NAMESPACE/$MODULE/v*" | sort -V | grep -B1 "$CURRENT_TAG" | head -1)

          if [ -z "$PREV_TAG" ] || [ "$PREV_TAG" = "$CURRENT_TAG" ]; then
            echo "No previous tag found, using initial commit"
            PREV_TAG=$(git rev-list --max-parents=0 HEAD)
          fi

          echo "prev_tag=$PREV_TAG" >> $GITHUB_OUTPUT
          echo "Previous tag: $PREV_TAG"

      - name: Generate changelog
        id: changelog
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          MODULE_PATH: ${{ steps.tag_info.outputs.module_path }}
          PREV_TAG: ${{ steps.prev_tag.outputs.prev_tag }}
          CURRENT_TAG: ${{ steps.tag_info.outputs.tag }}
        run: |
          echo "Generating changelog for $MODULE_PATH between $PREV_TAG and $CURRENT_TAG"

          COMMITS=$(git log --oneline --no-merges "$PREV_TAG..$CURRENT_TAG" -- "$MODULE_PATH")

          if [ -z "$COMMITS" ]; then
            echo "No commits found for this module"
            echo "changelog=No changes found for this module." >> $GITHUB_OUTPUT
            exit 0
          fi

          if [[ "$PREV_TAG" == release/* ]]; then
            FULL_CHANGELOG=$(gh api repos/:owner/:repo/releases/generate-notes \
              --field tag_name="$CURRENT_TAG" \
              --field previous_tag_name="$PREV_TAG" \
              --jq '.body')
          else
            echo "New module detected, skipping GitHub API"
            FULL_CHANGELOG=""
          fi

          MODULE_COMMIT_SHAS=$(git log --format="%H" --no-merges "$PREV_TAG..$CURRENT_TAG" -- "$MODULE_PATH")

          FILTERED_CHANGELOG="## What's Changed\n\n"

          for sha in $MODULE_COMMIT_SHAS; do
            SHORT_SHA=${sha:0:7}

            COMMIT_LINES=$(echo "$FULL_CHANGELOG" | grep -E "$SHORT_SHA|$(git log --format='%s' -n 1 $sha)" || true)

            if [ -n "$COMMIT_LINES" ]; then
              FILTERED_CHANGELOG="${FILTERED_CHANGELOG}${COMMIT_LINES}\n"
            else
              COMMIT_MSG=$(git log --format="%s" -n 1 $sha)
              AUTHOR=$(gh api repos/:owner/:repo/commits/$sha --jq '.author.login // .commit.author.name')
              FILTERED_CHANGELOG="${FILTERED_CHANGELOG}* $COMMIT_MSG by @$AUTHOR\n"
            fi
          done

          echo "changelog<<EOF" >> $GITHUB_OUTPUT
          echo -e "$FILTERED_CHANGELOG" >> $GITHUB_OUTPUT
          echo "EOF" >> $GITHUB_OUTPUT

      - name: Create Release
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          TAG_NAME: ${{ steps.tag_info.outputs.tag }}
          RELEASE_TITLE: ${{ steps.tag_info.outputs.release_title }}
          CHANGELOG: ${{ steps.changelog.outputs.changelog }}
        run: |
          gh release create "$TAG_NAME" \
            --title "$RELEASE_TITLE" \
            --notes "$CHANGELOG"