name: Build Docker Image

on:
  push:
    branches: [main, develop]
    tags:
      - 'v*'
  workflow_dispatch:

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}

jobs:
  build-and-push:
    runs-on: ubuntu-24.04-arm
    permissions:
      contents: write
      packages: write

    outputs:
      image-tag: ${{ steps.meta.outputs.tags }}
      image-digest: ${{ steps.build.outputs.digest }}

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

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

      - name: Log in to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Lowercase repository name
        id: lowercase
        run: |
          echo "repo=$(echo ${{ github.repository }} | tr '[:upper:]' '[:lower:]')" >> $GITHUB_OUTPUT

      - name: Extract metadata (tags, labels)
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ steps.lowercase.outputs.repo }}
          tags: |
            type=ref,event=branch
            type=ref,event=pr
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=sha,prefix={{branch}}-sha-,format=long
            type=raw,value=latest,enable={{is_default_branch}}

      - name: Build and push Docker image
        id: build
        uses: docker/build-push-action@v5
        with:
          context: ./services/nextjs
          file: ./deploy/docker/Dockerfile.prod
          push: true
          platforms: linux/arm64
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max

      - name: Extract SHA tag
        id: extract-tag
        run: |
          # Extract the SHA-based tag from the tags list
          TAGS="${{ steps.meta.outputs.tags }}"
          echo "All tags:"
          echo "$TAGS"
          echo "---"

          # Get commit SHA (full 40 characters)
          COMMIT_SHA="${{ github.sha }}"

          # Get current branch name
          BRANCH_NAME="${{ github.ref_name }}"
          echo "Branch: $BRANCH_NAME"

          # Method 1: Extract the full SHA tag from docker/metadata-action output
          # docker/metadata-action creates: <branch>-sha-<full-40-char-sha>
          SHA_TAG=$(echo "$TAGS" | grep -oE "${BRANCH_NAME}-sha-[a-f0-9]{40}" | head -n 1)

          # Method 2: If not found, try to extract any branch-sha- tag (fallback)
          if [ -z "$SHA_TAG" ]; then
            SHA_TAG=$(echo "$TAGS" | grep -oE "${BRANCH_NAME}-sha-[a-f0-9]+" | head -n 1)
            if [ -n "$SHA_TAG" ]; then
              echo "⚠️  Found SHA tag (may not be full 40 chars): $SHA_TAG"
            fi
          fi

          # Method 3: Fallback to commit SHA directly (construct the tag)
          if [ -z "$SHA_TAG" ]; then
            SHA_TAG="${BRANCH_NAME}-sha-$COMMIT_SHA"
            echo "⚠️  Could not extract from tags, using commit SHA: $SHA_TAG"
          fi

          if [ -z "$SHA_TAG" ]; then
            echo "❌ ERROR: Failed to extract SHA tag"
            exit 1
          fi

          echo "sha-tag=$SHA_TAG" >> $GITHUB_OUTPUT
          echo "✅ Extracted SHA tag: $SHA_TAG"

      - name: Update kustomization with new image tag
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          git config --global user.name "github-actions[bot]"
          git config --global user.email "github-actions[bot]@users.noreply.github.com"

          # Validate that SHA_TAG is not empty
          SHA_TAG="${{ steps.extract-tag.outputs.sha-tag }}"
          if [ -z "$SHA_TAG" ]; then
            echo "❌ ERROR: SHA_TAG is empty, cannot update kustomization"
            exit 1
          fi

          # Determine overlay based on branch
          BRANCH_NAME="${{ github.ref_name }}"
          if [ "$BRANCH_NAME" = "main" ]; then
            OVERLAY="prod"
          elif [ "$BRANCH_NAME" = "develop" ]; then
            OVERLAY="dev"
          else
            echo "⚠️  Unknown branch: $BRANCH_NAME, skipping kustomization update"
            exit 0
          fi

          KUSTOMIZATION_FILE="deploy/k8s/overlays/$OVERLAY/kustomization.yaml"

          # Check if kustomization file has images section
          if grep -q "images:" "$KUSTOMIZATION_FILE"; then
            echo "📝 Updating $KUSTOMIZATION_FILE with tag: $SHA_TAG"

            # Update kustomization.yaml with new image tag
            # Handle both cases: newTag: (with value) and newTag: (empty)
            sed -i.bak "s|newTag:.*|newTag: $SHA_TAG|" "$KUSTOMIZATION_FILE"

            # Verify the update was successful
            if grep -q "newTag: $SHA_TAG" "$KUSTOMIZATION_FILE"; then
              echo "✅ Successfully updated kustomization.yaml"
              rm -f "$KUSTOMIZATION_FILE.bak"
            else
              echo "❌ ERROR: Failed to update kustomization.yaml"
              cat "$KUSTOMIZATION_FILE"
              exit 1
            fi

            # Commit and push if there are changes
            if git diff --quiet; then
              echo "No changes to commit"
            else
              git add "$KUSTOMIZATION_FILE"
              git commit -m "Update $OVERLAY image to $SHA_TAG"
              git push
              echo "✅ Kustomization updated with new image tag: $SHA_TAG"
            fi
          else
            echo "ℹ️  $OVERLAY overlay uses base image (latest tag), skipping kustomization update"
            echo "   Image built with tag: $SHA_TAG"
          fi

      - name: Display image information
        run: |
          echo "✅ Image built and pushed successfully!"
          echo "📦 Image tags:"
          echo "${{ steps.meta.outputs.tags }}"
          echo "🔖 SHA tag: ${{ steps.extract-tag.outputs.sha-tag }}"
          echo "🔖 Digest: ${{ steps.build.outputs.digest }}"
          echo ""
          echo "🚀 Kustomization updated with new image tag"
          echo "   ArgoCD will automatically detect and deploy this new image"
          echo "   Monitor deployment at your ArgoCD dashboard"
