name: Docker Build

# PR validation and manual builds. Production pushes are handled by release.yml.
on:
  pull_request:
    branches: [main]
  workflow_dispatch:
    inputs:
      push:
        description: 'Push images to Docker Hub'
        required: true
        type: boolean
        default: false

concurrency:
  group: docker-${{ github.event.pull_request.number || github.ref }}
  cancel-in-progress: true

env:
  IMAGE_NAME_MCP: celstnblacc/excalidraw-mcp-sentinel
  IMAGE_NAME_CANVAS: celstnblacc/excalidraw-mcp-sentinel-canvas

jobs:
  check-changes:
    name: Check for Docker-related changes
    runs-on: ubuntu-latest
    outputs:
      should_build: ${{ steps.filter.outputs.should_build }}
    steps:
      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
        with:
          fetch-depth: 0

      - name: Check changed files
        id: filter
        run: |
          if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
            echo "should_build=true" >> "$GITHUB_OUTPUT"
            exit 0
          fi
          CHANGED=$(git diff --name-only origin/main...HEAD || true)
          if echo "$CHANGED" | grep -qE '^(Dockerfile|src/|frontend/|package\.json)'; then
            echo "should_build=true" >> "$GITHUB_OUTPUT"
          else
            echo "No Docker-related files changed, skipping builds"
            echo "should_build=false" >> "$GITHUB_OUTPUT"
          fi

  build-mcp:
    name: Build MCP Server image
    needs: check-changes
    if: needs.check-changes.outputs.should_build == 'true'
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@b5ca514318bd6ebac0fb2aedd5d36ec1b5c232a2 # v3.10.0

      - name: Log in to Docker Hub
        if: github.event_name == 'workflow_dispatch' && github.event.inputs.push == 'true'
        uses: docker/login-action@74a5d142397b4f367a81961eba4e8cd7edddf772 # v3.4.0
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.IMAGE_NAME_MCP }}
          tags: |
            type=ref,event=pr
            type=sha,prefix=sha-

      - name: Build MCP Server image
        uses: docker/build-push-action@14487ce63c7a62a4a324b0bfb37086795e31c6c1 # v5.5.0
        with:
          context: .
          file: ./Dockerfile
          push: ${{ github.event_name == 'workflow_dispatch' && github.event.inputs.push == 'true' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max

  build-canvas:
    name: Build Canvas Server image
    needs: check-changes
    if: needs.check-changes.outputs.should_build == 'true'
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@b5ca514318bd6ebac0fb2aedd5d36ec1b5c232a2 # v3.10.0

      - name: Log in to Docker Hub
        if: github.event_name == 'workflow_dispatch' && github.event.inputs.push == 'true'
        uses: docker/login-action@74a5d142397b4f367a81961eba4e8cd7edddf772 # v3.4.0
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.IMAGE_NAME_CANVAS }}
          tags: |
            type=ref,event=pr
            type=sha,prefix=sha-

      - name: Build Canvas Server image
        uses: docker/build-push-action@14487ce63c7a62a4a324b0bfb37086795e31c6c1 # v5.5.0
        with:
          context: .
          file: ./Dockerfile.canvas
          push: ${{ github.event_name == 'workflow_dispatch' && github.event.inputs.push == 'true' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max

  test-images:
    name: Test Docker images
    needs: [build-mcp, build-canvas]
    if: needs.build-mcp.result == 'success' && needs.build-canvas.result == 'success'
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2

      - name: Build and test Canvas image locally
        run: |
          docker build -f Dockerfile.canvas -t canvas-test .
          docker run -d -p 3000:3000 --name test-canvas canvas-test
          HEALTHY=false
          for i in $(seq 1 30); do
            if curl -sf http://localhost:3000/health > /dev/null 2>&1; then
              echo "Health check passed on attempt $i"
              HEALTHY=true
              break
            fi
            echo "Waiting for server... ($i/30)"
            sleep 1
          done
          if [ "$HEALTHY" != "true" ]; then
            echo "::error::Health check failed after 30 attempts"
            docker logs test-canvas
            docker stop test-canvas || true
            exit 1
          fi
          curl -sf http://localhost:3000/health | jq .
          docker stop test-canvas

  docker-status:
    runs-on: ubuntu-latest
    continue-on-error: false
    name: Docker Build Status Check
    needs: [check-changes, build-mcp, build-canvas, test-images]
    if: always()
    permissions:
      statuses: write
    steps:
      - name: Failed
        id: failed
        if: contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled')
        run: |
          curl -X POST -H "Content-Type: application/json" -H "Authorization: token ${{ github.token }}" \
          -d '{ "state" : "failure" , "context" : "github/docker-build-check" , "description" : "Docker build failed", "target_url" : "https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}" }' \
          https://api.github.com/repos/${{ github.repository }}/statuses/${{ github.sha }}
          exit 1
      - name: Success
        if: steps.failed.conclusion == 'skipped'
        run: |
          curl -X POST -H "Content-Type: application/json" -H "Authorization: token ${{ github.token }}" \
          -d '{ "state" : "success" , "context" : "github/docker-build-check" , "description" : "Docker build passed", "target_url" : "https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}" }' \
          https://api.github.com/repos/${{ github.repository }}/statuses/${{ github.sha }}