# Gitea Actions Workflow: Backend Build via Modal (Serverless)
# Place at: .gitea/workflows/backend-modal.yaml
#
# This workflow offloads the heavy Docker build to Modal's serverless infrastructure,
# avoiding resource constraints on the 2GB RAM Lightsail VM runner.
#
# Required Gitea Repository Secrets:
#   MODAL_TOKEN          - Modal API token (from modal.com/settings)
#   AWS_ACCESS_KEY_ID    - For ECR push
#   AWS_SECRET_ACCESS_KEY
#   AWS_REGION           - e.g., us-east-1
#
# Required Gitea Repository Variables:
#   ECR_PUBLIC_REGISTRY_ALIAS - Your public.ecr.aws alias (e.g., vkist-project)
#   TRITON_ENDPOINT          - Modal Triton endpoint for CV inference
#   CV_INFERENCE_HOST        - Bind host (default: 0.0.0.0)
#   CV_INFERENCE_PORT        - Bind port (default: 8001)
#   BASE_URL                 - External base URL for routing

name: Backend Modal Build

on:
  push:
    branches:
      - '**'
    paths:
      - 'workspace/sprint_1_2/CODEBASE/backend/**'
      - 'workspace/sprint_1_2/CODEBASE/requirements.txt'
      - 'workspace/sprint_1_2/CODEBASE/deps/implementation/backend_deploy/**'
  workflow_dispatch:
    inputs:
      tag:
        description: 'Image tag (default: git SHA)'
        required: false
        type: string
      platform:
        description: 'Target platform'
        required: false
        type: string
        default: 'linux/amd64'

permissions:
  contents: read
  packages: write

env:
  BACKEND_DIR: workspace/sprint_1_2/CODEBASE/backend
  ECR_REGISTRY: public.ecr.aws
  ECR_REPOSITORY: ${{ vars.ECR_PUBLIC_REGISTRY_ALIAS }}/msk-cv-inference-server
  DOCKERFILE_PATH: deps/implementation/backend_deploy/Dockerfile
  MODAL_SCRIPT: workspace/sprint_1_2/CODEBASE/deps/implementation/backend_deploy/gitea_modal_build.py

  # Runtime config (forwarded to container via deployment)
  TRITON_ENDPOINT: ${{ vars.TRITON_ENDPOINT }}
  CV_INFERENCE_HOST: ${{ vars.CV_INFERENCE_HOST }}
  CV_INFERENCE_PORT: ${{ vars.CV_INFERENCE_PORT }}
  BASE_URL: ${{ vars.BASE_URL }}
  CORS_ORIGINS: ${{ vars.CORS_ORIGINS }}
  ECR_PUBLIC_REGISTRY_ALIAS: ${{ vars.ECR_PUBLIC_REGISTRY_ALIAS }}

jobs:
  build-via-modal:
    name: Build & Push via Modal
    runs-on: ubuntu-latest
    timeout-minutes: 20
    
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          python-version: '3.12'

      - name: Install Modal CLI
        run: pip install modal

      - name: Configure AWS credentials
        uses: aws-actions/configure-aws-credentials@v4
        with:
          aws-access-key-id: ${{ secrets.AWS_ACCESS_KEY_ID }}
          aws-secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
          aws-region: ${{ env.AWS_REGION || 'us-east-1' }}

      - name: Login to Amazon ECR Public
        id: login-ecr
        uses: aws-actions/amazon-ecr-login@v2
        with:
          registry-type: public
          mask-password: 'true'

      - name: Determine image tag
        id: tag
        run: |
          if [ -n "${{ github.event.inputs.tag }}" ]; then
            echo "tag=${{ github.event.inputs.tag }}" >> $GITHUB_OUTPUT
          elif [ "${{ github.ref_type }}" = "tag" ]; then
            echo "tag=${{ github.ref_name }}" >> $GITHUB_OUTPUT
          else
            echo "tag=${{ github.sha }}" >> $GITHUB_OUTPUT
          fi
          echo "tag=latest" >> $GITHUB_OUTPUT

      - name: Build and push via Modal
        id: modal-build
        env:
          MODAL_TOKEN: ${{ secrets.MODAL_TOKEN }}
        run: |
          modal run ${{ env.MODAL_SCRIPT }} \
            --registry ${{ env.ECR_REGISTRY }}/${{ env.ECR_REPOSITORY }} \
            --image-name "" \
            --tag ${{ steps.tag.outputs.tag }} \
            --platform linux/amd64 \
            --push

      - name: Print image URI
        run: |
          echo "Successfully pushed: ${{ env.ECR_REGISTRY }}/${{ env.ECR_REPOSITORY }}:${{ steps.tag.outputs.tag }}"
          echo "image=${{ env.ECR_REGISTRY }}/${{ env.ECR_REPOSITORY }}:${{ steps.tag.outputs.tag }}" >> $GITHUB_OUTPUT

  # Optional: Trigger dependent deployments
  # trigger-triton:
  #   needs: build-via-modal
  #   if: success() && github.event_name == 'push'
  #   uses: ./.gitea/workflows/trigger_modal_triton.yaml
  #   secrets: inherit

  notify-deploy:
    needs: build-via-modal
    if: success() && github.event_name == 'push'
    runs-on: ubuntu-latest
    steps:
      - name: Trigger deployment webhook
        if: env.DEPLOY_WEBHOOK_URL != ''
        env:
          DEPLOY_WEBHOOK_URL: ${{ secrets.DEPLOY_WEBHOOK_URL }}
          WEBHOOK_SECRET: ${{ secrets.WEBHOOK_SECRET }}
        run: |
          cat <<EOF | curl -X POST "${DEPLOY_WEBHOOK_URL}" \
            -H "Content-Type: application/json" \
            -H "X-Gitea-Signature: sha256=$(echo -n '@-' | openssl dgst -sha256 -hmac "${WEBHOOK_SECRET}" | cut -d' ' -f2)" \
            -d @-
          {
            "service": "cv-inference-server",
            "image": "${{ env.ECR_REGISTRY }}/${{ env.ECR_REPOSITORY }}:${{ steps.tag.outputs.tag }}",
            "env": {
              "TRITON_ENDPOINT": "${{ vars.TRITON_ENDPOINT }}",
              "CV_INFERENCE_HOST": "${{ vars.CV_INFERENCE_HOST }}",
              "CV_INFERENCE_PORT": "${{ vars.CV_INFERENCE_PORT }}",
              "BASE_URL": "${{ vars.BASE_URL }}",
              "CORS_ORIGINS": "${{ vars.CORS_ORIGINS }}",
              "ECR_PUBLIC_REGISTRY_ALIAS": "${{ vars.ECR_PUBLIC_REGISTRY_ALIAS }}"
            }
          }
          EOF