name: Container Image
run-name: ${{ github.event_name == 'workflow_run' && format('Image - {0} ({1})', github.event.workflow_run.head_commit.message, github.event.workflow_run.head_branch) || format('Image - {0}', github.ref_name) }}

on:
  workflow_dispatch:
  workflow_run:
    workflows: ["CI"]
    types: [completed]
    branches: [main]
  push:
    tags:
      - "v*"

concurrency:
  # Use the commit SHA across all trigger types so a workflow_run completion and a
  # simultaneous tag push for the same commit share one concurrency slot and cancel correctly.
  group: ${{ github.workflow }}-${{ github.event_name == 'workflow_run' && github.event.workflow_run.head_sha || github.sha }}
  cancel-in-progress: true

permissions:
  actions: read
  contents: read

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

jobs:
  image:
    name: Build and Push Image
    if: github.event_name != 'workflow_run' || github.event.workflow_run.conclusion == 'success'
    runs-on: ubuntu-latest
    timeout-minutes: 45
    permissions:
      contents: read
      packages: write
    steps:
      - name: Resolve source and image tags
        id: vars
        shell: bash
        env:
          EVENT_NAME: ${{ github.event_name }}
          GH_REF: ${{ github.ref }}
          GH_REF_NAME: ${{ github.ref_name }}
          GH_SHA: ${{ github.sha }}
          WORKFLOW_RUN_HEAD_SHA: ${{ github.event.workflow_run.head_sha }}
        run: |
          # SHA resolution mirrors the concurrency group logic at the top of this workflow.
          if [[ "$EVENT_NAME" == "workflow_dispatch" && "$GH_REF" != "refs/heads/main" ]]; then
            echo "workflow_dispatch is only supported from main."
            exit 1
          fi

          if [[ "$EVENT_NAME" == "workflow_run" ]]; then
            SHA="$WORKFLOW_RUN_HEAD_SHA"
          else
            SHA="$GH_SHA"
          fi

          SHORT_SHA="${SHA:0:12}"
          IMAGE="$REGISTRY/$IMAGE_NAME"

          PRIMARY_TAG="$GH_REF_NAME"

          echo "checkout_ref=${SHA}" >> "$GITHUB_OUTPUT"
          echo "image=${IMAGE}" >> "$GITHUB_OUTPUT"
          echo "tags<<EOF" >> "$GITHUB_OUTPUT"
          echo "${IMAGE}:${PRIMARY_TAG}" >> "$GITHUB_OUTPUT"
          echo "${IMAGE}:sha-${SHORT_SHA}" >> "$GITHUB_OUTPUT"
          echo "EOF" >> "$GITHUB_OUTPUT"

      - name: Checkout
        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
        with:
          ref: ${{ steps.vars.outputs.checkout_ref }}

      - name: Verify CI succeeded for tag commit
        if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/')
        shell: bash
        env:
          GH_TOKEN: ${{ github.token }}
          COMMIT_SHA: ${{ github.sha }}
          GH_REPO: ${{ github.repository }}
        run: |
          set -euo pipefail
          echo "Checking CI status for commit ${COMMIT_SHA}..."
          success_count=$(gh api --paginate \
            "repos/${GH_REPO}/actions/workflows/ci.yml/runs?head_sha=${COMMIT_SHA}&status=completed" \
            --jq '[.workflow_runs[] | select(.conclusion == "success")] | length' \
            | awk '{sum += $1} END {print sum}')
          if [[ "${success_count:-0}" -lt 1 ]]; then
            echo "No successful CI run found for tag commit ${COMMIT_SHA}. Refusing to publish image."
            exit 1
          fi
          echo "CI verification passed: ${success_count} successful run(s) found."

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@8d2750c68a42422c14e847fe6c8ac0403b4cbd6f # v3

      - name: Log in to GHCR
        uses: docker/login-action@c94ce9fb468520275223c153574b00df6fe4bcc9 # v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Build and push image
        id: build_push
        uses: docker/build-push-action@10e90e3645eae34f1e60eeb005ba3a3d33f178e8 # v6
        with:
          context: .
          file: ./Dockerfile
          push: true
          tags: ${{ steps.vars.outputs.tags }}
          platforms: linux/amd64
          cache-from: type=gha
          cache-to: type=gha,mode=max