name: Build Docker Image

on:
  push:
    branches: [ "master" ]
    tags: [ "*" ]
  pull_request:
    branches: [ "master" ]

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

# add permission for package publishing
permissions:
  contents: read
  packages: write

jobs:
  build_image:
    runs-on: ubuntu-24.04
    steps:
      # checkout code
      - name: Checkout repository
        uses: actions/checkout@v4

      # set up go
      - name: Set up Go
        uses: actions/setup-go@v5
        with:
          go-version: "1.25"
          check-latest: true

      # download Go modules
      - name: Download Go modules
        run: go mod download

      # build do
      - name: Build Go Binary (multi-arch)
        run: |
          # build amd64 binary
          GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -o credit-server-amd64 main.go

          # build arm64 binary
          GOOS=linux GOARCH=arm64 CGO_ENABLED=0 go build -o credit-server-arm64 main.go

          # show binaries
          ls -alh credit-server-*

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

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

      # extract metadata for docker
      - name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            type=raw,value=latest,enable=${{ github.ref == 'refs/heads/master' }}
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=ref,event=tag
            type=sha,format=short,prefix=

      # build and push docker image
      - name: Build Docker image
        uses: docker/build-push-action@v5
        with:
          context: .
          push: ${{ github.ref_type == 'tag' || (github.ref == 'refs/heads/master' && github.event_name == 'push') }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          platforms: linux/amd64,linux/arm64

  build_frontend_image:
    runs-on: ubuntu-24.04
    steps:
      # checkout code
      - name: Checkout repository
        uses: actions/checkout@v4

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

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

      # extract metadata for docker (frontend)
      - name: Extract Docker metadata (frontend)
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.FRONTEND_IMAGE_NAME }}
          tags: |
            type=raw,value=latest,enable=${{ github.ref == 'refs/heads/master' }}
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=ref,event=tag
            type=sha,format=short,prefix=

      # generate frontend build date in utc
      - name: Generate frontend build date
        id: frontend_build_meta
        run: echo "build_date=$(date -u +'%Y/%m/%d UTC')" >> "$GITHUB_OUTPUT"

      # build and push frontend docker image with version argument
      - name: Build Frontend Docker image
        uses: docker/build-push-action@v5
        with:
          context: ./frontend
          push: ${{ github.ref_type == 'tag' || (github.ref == 'refs/heads/master' && github.event_name == 'push') }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          platforms: linux/amd64
          build-args: |
            VERSION=${{ github.ref_type == 'tag' && github.ref_name || '' }}
            BUILD_DATE=${{ steps.frontend_build_meta.outputs.build_date }}

  update_helm_values:
    runs-on: ubuntu-24.04
    needs: [build_image, build_frontend_image]
    if: github.ref_type == 'tag'
    steps:
      # configure SSH agent with deploy key
      - name: Setup SSH agent
        uses: webfactory/ssh-agent@v0.9.0
        with:
          ssh-private-key: ${{ secrets.DEPLOY_KEY }}

      # add github.com to known_hosts to avoid host verification prompt
      - name: Add GitHub to known_hosts
        run: ssh-keyscan github.com >> ~/.ssh/known_hosts

      # clone the helm charts repository
      - name: Clone Helm Charts repository
        run: git clone ${{ vars.HELM_CHARTS_REPO }} helm-charts

      # install yq for yaml editing
      - name: Install yq
        run: |
          sudo wget -qO /usr/local/bin/yq https://github.com/mikefarah/yq/releases/latest/download/yq_linux_amd64
          sudo chmod +x /usr/local/bin/yq

      # determine helm values file based on tag type (production or test)
      - name: Determine Helm values file
        id: helm_config
        run: |
          TAG="${{ github.ref_name }}"
          if [[ $TAG =~ ^v[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
            echo "values_file=values/credit/credit.yaml" >> "$GITHUB_OUTPUT"
            echo "branch_prefix=update/credit" >> "$GITHUB_OUTPUT"
          else
            echo "values_file=values/credit_test/credit.yaml" >> "$GITHUB_OUTPUT"
            echo "branch_prefix=update/credit_test" >> "$GITHUB_OUTPUT"
          fi

      # update image tags in helm values file
      - name: Update image tags in helm values file
        run: |
          cd helm-charts
          yq -i '.image.tag = "${{ github.ref_name }}"' ${{ steps.helm_config.outputs.values_file }}
          yq -i '.image.webTag = "${{ github.ref_name }}"' ${{ steps.helm_config.outputs.values_file }}

      # commit and push to a new branch, then open a PR for review
      - name: Commit, push and create PR
        env:
          GH_TOKEN: ${{ secrets.GH_TOKEN }}
        run: |
          cd helm-charts
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
          BRANCH_NAME="${{ steps.helm_config.outputs.branch_prefix }}-${{ github.ref_name }}"
          git checkout -b "$BRANCH_NAME"
          git add ${{ steps.helm_config.outputs.values_file }}
          git commit -m "chore: update credit image tag to ${{ github.ref_name }}"
          git push origin "$BRANCH_NAME"
          HELM_REPO=$(echo "${{ vars.HELM_CHARTS_REPO }}" | sed 's/git@github.com://;s/\.git$//')
          gh pr create \
            --repo "${HELM_REPO}" \
            --title "chore: update credit image tag to ${{ github.ref_name }}" \
            --body "Automated PR: update \`${{ steps.helm_config.outputs.values_file }}\` image tags to \`${{ github.ref_name }}\` after Docker image build." \
            --base main \
            --head "$BRANCH_NAME"