name: Release and Build Image

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="${TAG#v}"
          IMAGE_REGISTRY="${{ gitea.server_url }}"
          IMAGE_REGISTRY="${IMAGE_REGISTRY#http://}"
          IMAGE_REGISTRY="${IMAGE_REGISTRY#https://}"
          IMAGE_NAME="${IMAGE_REGISTRY}/${{ gitea.repository }}"

          echo "TAG=$TAG" >> "$GITHUB_ENV"
          echo "VERSION=$VERSION" >> "$GITHUB_ENV"
          echo "IMAGE_NAME=$IMAGE_NAME" >> "$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: |
          python3 - <<'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")

          pattern = re.compile(
              rf"^##\s+\[?{re.escape(version)}\]?[^\n]*\n(.*?)(?=^##\s+\[?[0-9]|\Z)",
              re.MULTILINE | re.DOTALL,
          )

          match = pattern.search(text)
          if match:
              body = match.group(1).strip()
          else:
              body = f"Release {version}"

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

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

      - name: Log in to Gitea container registry
        shell: bash
        env:
          REGISTRY_USERNAME: ${{ secrets.REGISTRY_USERNAME }}
          REGISTRY_TOKEN: ${{ secrets.RELEASE_TOKEN }}
        run: |
          echo "$REGISTRY_TOKEN" | docker login "${IMAGE_NAME%%/*}" -u "$REGISTRY_USERNAME" --password-stdin

      - name: Build Docker image
        shell: bash
        run: |
          docker build \
            -t "$IMAGE_NAME:$TAG" \
            -t "$IMAGE_NAME:latest" \
            .

      - name: Push version tag
        shell: bash
        run: |
          docker push "$IMAGE_NAME:$TAG"

      - name: Push latest tag
        if: ${{ !contains(env.TAG, '-') }}
        shell: bash
        run: |
          docker push "$IMAGE_NAME:latest"

      - name: Push prerelease channel tag
        if: ${{ contains(env.TAG, '-') }}
        shell: bash
        run: |
          CHANNEL="${TAG#*-}"
          CHANNEL="${CHANNEL%%.*}"
          docker tag "$IMAGE_NAME:$TAG" "$IMAGE_NAME:$CHANNEL"
          docker push "$IMAGE_NAME:$CHANNEL"

      - name: Create Gitea release
        env:
          RELEASE_TOKEN: ${{ secrets.RELEASE_TOKEN }}
          GITEA_SERVER_URL: ${{ gitea.server_url }}
          GITEA_REPOSITORY: ${{ gitea.repository }}
        shell: bash
        run: |
          python3 - <<'PY'
          import json
          import os
          import urllib.request
          import urllib.error

          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"]

          image_name = os.environ["IMAGE_NAME"]
          tag = os.environ["TAG"]

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

          header = (
              "## 🚀 How to run this release\n\n"
              "### Pull image\n"
              f"```bash\n"
              f"docker pull {image_name}:{tag}\n"
              f"```\n\n"
              "### Run container\n"
              f"```bash\n"
              f"docker run -d \\\n"
              f"  --name lst \\\n"
              f"  -p 3000:3000 \\\n"
              f"  {image_name}:{tag}\n"
              f"```\n\n"
              "---\n\n"
          )

          import os
          import re
          from pathlib import Path

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

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

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

          pattern = re.compile(
              rf"^##\s+{re.escape(version)}(?:\s*\([^)]+\))?\n(.*?)(?=^##\s+[0-9]|\Z)",
              re.MULTILINE | re.DOTALL,
          )

          match = pattern.search(text)

          if match:
              body = match.group(1).strip()
          else:
              body = f"Release {version}"

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

          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