name: Build and Push Docker Image

on:
  push:
    tags:
      - 'v*'  # Triggers on v1.0.0, v2.1.3, etc.
  workflow_dispatch:  # Manual trigger option

jobs:
  build-and-push:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write

    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract version from tag
        id: meta
        run: |
          # Ensure we're building from a tag
          if [[ "$GITHUB_REF" != refs/tags/* ]]; then
            echo "Error: This workflow should only run on tag pushes"
            echo "GITHUB_REF: $GITHUB_REF"
            exit 1
          fi
          VERSION=${GITHUB_REF#refs/tags/v}
          echo "version=$VERSION" >> $GITHUB_OUTPUT
          echo "Building version: $VERSION"

          # Docker tags must be lowercase
          REPO_OWNER_LOWER=$(echo "${{ github.repository_owner }}" | tr '[:upper:]' '[:lower:]')
          echo "repo_owner_lower=$REPO_OWNER_LOWER" >> $GITHUB_OUTPUT
          echo "Repository owner (lowercase): $REPO_OWNER_LOWER"

      - name: Build and push Docker image
        uses: docker/build-push-action@v5
        with:
          context: .
          push: true
          tags: |
            ghcr.io/${{ steps.meta.outputs.repo_owner_lower }}/ai-trader:${{ steps.meta.outputs.version }}
            ghcr.io/${{ steps.meta.outputs.repo_owner_lower }}/ai-trader:latest
          cache-from: type=gha
          cache-to: type=gha,mode=max

      - name: Image published
        run: |
          echo "✅ Docker image published successfully!"
          echo "📦 Pull with: docker pull ghcr.io/${{ steps.meta.outputs.repo_owner_lower }}/ai-trader:${{ steps.meta.outputs.version }}"
          echo "📦 Or latest: docker pull ghcr.io/${{ steps.meta.outputs.repo_owner_lower }}/ai-trader:latest"