name: Create Gitea Release

on:
  push:
    tags:
      - "v*"

jobs:
  release:
    runs-on: ubuntu-latest

    steps:
      - name: Check out repository
        uses: actions/checkout@v4

      - name: Prepare release metadata
        shell: bash
        run: |
          TAG="${GITHUB_REF_NAME:-${GITHUB_REF##refs/tags/}}"
          VERSION="${TAG#v}"

          echo "TAG=$TAG" >> "$GITHUB_ENV"
          echo "VERSION=$VERSION" >> "$GITHUB_ENV"

          if [[ "$TAG" == *-* ]]; then
            echo "PRERELEASE=true" >> "$GITHUB_ENV"
          else
            echo "PRERELEASE=false" >> "$GITHUB_ENV"
          fi

      - name: Extract matching CHANGELOG section
        shell: bash
        run: |
          python <<'PY'
          import os
          import re
          from pathlib import Path

          version = os.environ["VERSION"]
          changelog_path = Path("CHANGELOG.md")

          if not changelog_path.exists():
              body = f"# {version}\n\nNo CHANGELOG.md found."
              Path("release_body.md").write_text(body, encoding="utf-8")
              raise SystemExit(0)

          text = changelog_path.read_text(encoding="utf-8")

          # Matches headings like:
          # ## 1.2.3
          # ## 1.2.3-alpha.0
          # ## [1.2.3]
          pattern = re.compile(
              rf"^##\s+\[?{re.escape(version)}\]?(?:\s*-.*)?\n(.*?)(?=^##\s|\Z)",
              re.MULTILINE | re.DOTALL,
          )

          match = pattern.search(text)
          if match:
              body = match.group(1).strip()
          else:
              body = text.strip()

          if not body:
              body = f"Release {version}"

          Path("release_body.md").write_text(body + "\n", encoding="utf-8")
          PY

      - name: Create Gitea release
        env:
          RELEASE_TOKEN: ${{ secrets.RELEASE_TOKEN }}
          GITEA_SERVER_URL: ${{ gitea.server_url }}
          GITEA_REPOSITORY: ${{ gitea.repository }}
        shell: bash
        run: |
          python <<'PY'
          import json
          import os
          import urllib.request

          tag = os.environ["TAG"]
          prerelease = os.environ["PRERELEASE"].lower() == "true"
          server_url = os.environ["GITEA_SERVER_URL"].rstrip("/")
          repo = os.environ["GITEA_REPOSITORY"]
          token = os.environ["RELEASE_TOKEN"]

          with open("release_body.md", "r", encoding="utf-8") as f:
              body = f.read()

          url = f"{server_url}/api/v1/repos/{repo}/releases"
          payload = {
              "tag_name": tag,
              "name": tag,
              "body": body,
              "draft": False,
              "prerelease": prerelease,
          }

          data = json.dumps(payload).encode("utf-8")
          req = urllib.request.Request(
              url,
              data=data,
              method="POST",
              headers={
                  "Authorization": f"token {token}",
                  "Content-Type": "application/json",
                  "Accept": "application/json",
              },
          )

          try:
              with urllib.request.urlopen(req) as resp:
                  print(resp.read().decode("utf-8"))
          except urllib.error.HTTPError as e:
              details = e.read().decode("utf-8", errors="replace")
              print(details)
              raise
          PY