name: Auto Changelog & Release

on:
  push:
    branches:
      - main
      - "**"

jobs:
  detect-version-change:
    runs-on: ubuntu-latest
    outputs:
      version_changed: ${{ steps.set.outputs.version_changed }}
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Check if VERSION file changed
        if: github.ref == 'refs/heads/main'
        run: |
          echo "🔍 Vergleich mit github.event.before:"
          echo "Before: ${{ github.event.before }}"
          echo "After:  ${{ github.sha }}"

          echo "📄 Changed files between before and after:"
          git diff --name-only ${{ github.event.before }} ${{ github.sha }} || echo "(diff failed)"

          if git diff --name-only ${{ github.event.before }} ${{ github.sha }} | grep -q '^VERSION$'; then
            echo "✅ VERSION file was changed"
            echo "VERSION_CHANGED=true" >> $GITHUB_ENV
          else
            echo "ℹ️ VERSION file not changed"
            echo "VERSION_CHANGED=false" >> $GITHUB_ENV
          fi

      - name: Set output (always)
        id: set
        run: |
          echo "version_changed=${VERSION_CHANGED:-false}" >> $GITHUB_OUTPUT

  changelog-only:
    needs: detect-version-change
    if: github.ref != 'refs/heads/main' || needs.detect-version-change.outputs.version_changed == 'false'
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Set Git Author
        run: |
          git config user.name "$CI_COMMIT_AUTHOR_NAME"
          git config user.email "$CI_COMMIT_AUTHOR_EMAIL"

      - name: Read CLIFF_VERSION from cliff.toml
        id: cliff_version
        run: |
          echo "version=$(awk -F '=' '/^# CLIFF_VERSION=/ { gsub(/[" ]/, "", $2); print $2 }' cliff.toml)" >> $GITHUB_OUTPUT

      - name: Restore git-cliff cache
        id: restore-cliff
        uses: https://git.0xmax42.io/actions/cache@v1
        with:
          key: cargo-cliff-${{ steps.cliff_version.outputs.version }}
          paths: |
            /root/.cargo/bin

      - name: Install git-cliff
        if: steps.restore-cliff.outputs.cache-hit != 'true'
        run: |
          cargo install git-cliff --version "${{ steps.cliff_version.outputs.version }}" --features gitea

      - name: Generate unreleased changelog (if file exists or on main)
        run: |
          if [[ -f CHANGELOG.md || "${GITHUB_REF##refs/heads/}" == "main" ]]; then
            echo "Generating CHANGELOG.md..."
            git-cliff -c cliff.toml -o CHANGELOG.md
          else
            echo "CHANGELOG.md does not exist and this is not 'main'. Skipping generation."
          fi

      - name: Commit updated CHANGELOG
        run: |
          git add CHANGELOG.md
          if git diff --cached --quiet; then
            echo "No changes to commit"
          else
            git commit -m "chore(changelog): update unreleased changelog"
            git push origin "${GITHUB_REF##refs/heads/}"
          fi

  release:
    needs: detect-version-change
    if: needs.detect-version-change.outputs.version_changed == 'true' && github.ref == 'refs/heads/main'
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Set Git Author
        run: |
          git config user.name "$CI_COMMIT_AUTHOR_NAME"
          git config user.email "$CI_COMMIT_AUTHOR_EMAIL"

      - name: Read VERSION
        id: version
        run: echo "value=$(cat VERSION)" >> $GITHUB_OUTPUT

      - name: Read CLIFF_VERSION from cliff.toml
        id: cliff_version
        run: |
          echo "version=$(awk -F '=' '/^# CLIFF_VERSION=/ { gsub(/[" ]/, "", $2); print $2 }' cliff.toml)" >> $GITHUB_OUTPUT

      - name: Restore git-cliff cache
        id: restore-cliff
        uses: https://git.0xmax42.io/actions/cache@v1
        with:
          key: cargo-cliff-${{ steps.cliff_version.outputs.version }}
          paths: |
            /root/.cargo/bin

      - name: Install git-cliff
        if: steps.restore-cliff.outputs.cache-hit != 'true'
        run: |
          cargo install git-cliff --version "${{ steps.cliff_version.outputs.version }}" --features gitea

      - name: Generate changelog for release and tag
        id: generate-changelog
        run: |
          VERSION=${{ steps.version.outputs.value }}
          git-cliff -c cliff.toml -t "v$VERSION" -o CHANGELOG.md

          BODY=$(mktemp)
          ESCAPED_VERSION=$(echo "$VERSION" | sed 's/\./\\./g')

          awk -v ver="$ESCAPED_VERSION" '
            $0 ~ "^## \\[" ver "\\]" {
              print_flag=1
              line = $0
              sub(/^## /, "", line)
              sub(/\\s*\\(.*\\)/, "", line)  # entfernt z. B. "(...)" oder "(*)"
              print line
              next
            }
            $0 ~ "^## \\[" && $0 !~ "^## \\[" ver "\\]" {
              print_flag=0
            }
            print_flag
          ' CHANGELOG.md > "$BODY"

          echo "changelog_body_path=$BODY" >> $GITHUB_OUTPUT

      - name: Commit updated CHANGELOG
        run: |
          git add CHANGELOG.md
          if git diff --cached --quiet; then
            echo "No changes to commit"
          else
            git commit -m "chore(changelog): update changelog for v${{ steps.version.outputs.value }}"
            git push origin main
          fi

      - name: Create Git tag (if not exists)
        run: |
          VERSION=${{ steps.version.outputs.value }}
          if git rev-parse "v$VERSION" >/dev/null 2>&1; then
            echo "Tag v$VERSION already exists, skipping tag creation."
          else
            export GIT_AUTHOR_DATE="$(date --iso-8601=seconds)"
            export GIT_COMMITTER_DATE="$GIT_AUTHOR_DATE"
            git tag -a "v$VERSION" -F "${{ steps.generate-changelog.outputs.changelog_body_path }}" --cleanup=verbatim
            git push origin "v$VERSION"
          fi

      - name: Create Gitea release
        env:
          RELEASE_PUBLISH_TOKEN: ${{ secrets.RELEASE_PUBLISH_TOKEN }}
        run: |
          VERSION=${{ steps.version.outputs.value }}
          BODY_FILE="${{ steps.generate-changelog.outputs.changelog_body_path }}"

          OWNER=$(echo "$GITHUB_REPOSITORY" | cut -d/ -f1)
          REPO=$(echo "$GITHUB_REPOSITORY" | cut -d/ -f2)

          # Token-Auswahl
          TOKEN="${RELEASE_PUBLISH_TOKEN:-$ACTIONS_RUNTIME_TOKEN}"

          if [[ -z "${RELEASE_PUBLISH_TOKEN:-}" ]]; then
            echo "::warning title=Limited Release Propagation::"
            echo "RELEASE_PUBLISH_TOKEN is not set. Using ACTIONS_RUNTIME_TOKEN instead."
            echo "⚠️  Release events may not trigger other workflows if created with the runtime token."
            echo
          fi

          # Prüfe, ob der Release schon existiert
          if curl -sf "$GITHUB_API_URL/repos/$OWNER/$REPO/releases/tags/v$VERSION" \
            -H "Authorization: token $TOKEN" > /dev/null; then
            echo "🔁 Release for tag v$VERSION already exists, skipping."
            exit 0
          fi

          echo "🚀 Creating Gitea release for v$VERSION"

          # Release-Beschreibung vorbereiten
          RELEASE_BODY=$(tail -n +2 "$BODY_FILE" | jq -Rs .)

          curl -X POST "$GITHUB_API_URL/repos/$OWNER/$REPO/releases" \
            -H "Authorization: token $TOKEN" \
            -H "Content-Type: application/json" \
            -d @- <<EOF
          {
            "tag_name": "v$VERSION",
            "target_commitish": "main",
            "name": "Release v$VERSION",
            "body": $RELEASE_BODY,
            "draft": false,
            "prerelease": false
          }
          EOF

          echo "✅ Release for tag $VERSION created successfully."