# Builds and publishes the temetro Docker images and cuts a GitHub Release.
#
# Trigger: push a semver tag, e.g.
#   git tag v0.1.0 && git push origin v0.1.0
#
# Multi-arch (amd64 + arm64) is built on NATIVE runners — amd64 on ubuntu-24.04,
# arm64 on ubuntu-24.04-arm — and merged into a manifest. We do NOT emulate arm64
# with QEMU anymore: a runner/QEMU update started crashing `npm ci` under
# emulation ("illegal instruction") and hanging the build for hours.
#
# The frontend image bakes NO API URL — it resolves the backend from the host
# the browser uses at runtime — so one published image works for every clinic.
#
# Required repository secrets (Settings → Secrets and variables → Actions):
#   DOCKERHUB_USERNAME  — the Docker Hub account `khalidxv` (or one with push
#                         access to that namespace)
#   DOCKERHUB_TOKEN     — a Docker Hub access token for that account
# Without them the build/login step fails; the workflow is otherwise inert.
name: release

on:
  push:
    tags:
      - "v*.*.*"

env:
  REGISTRY_NAMESPACE: khalidxv

jobs:
  # One build per (image × platform) on the platform's native runner, pushed to
  # Docker Hub by digest (no tag yet). The merge job stitches the per-arch
  # digests into a single tagged multi-arch manifest.
  build:
    name: Build ${{ matrix.image }} (${{ matrix.platform }})
    runs-on: ${{ matrix.platform == 'linux/arm64' && 'ubuntu-24.04-arm' || 'ubuntu-24.04' }}
    timeout-minutes: 40
    strategy:
      fail-fast: false
      matrix:
        image: [backend, frontend]
        platform: [linux/amd64, linux/arm64]
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Prepare platform pair
        run: |
          platform="${{ matrix.platform }}"
          echo "PLATFORM_PAIR=${platform//\//-}" >> "$GITHUB_ENV"

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

      - name: Log in to Docker Hub
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Build & push by digest
        id: build
        uses: docker/build-push-action@v6
        with:
          context: ./${{ matrix.image }}
          platforms: ${{ matrix.platform }}
          provenance: false
          outputs: type=image,name=${{ env.REGISTRY_NAMESPACE }}/temetro-${{ matrix.image }},push-by-digest=true,name-canonical=true,push=true

      - name: Export digest
        run: |
          mkdir -p "${{ runner.temp }}/digests"
          digest="${{ steps.build.outputs.digest }}"
          touch "${{ runner.temp }}/digests/${digest#sha256:}"

      - name: Upload digest
        uses: actions/upload-artifact@v4
        with:
          name: digests-${{ matrix.image }}-${{ env.PLATFORM_PAIR }}
          path: ${{ runner.temp }}/digests/*
          if-no-files-found: error
          retention-days: 1

  # Combine the per-arch digests for each image into one multi-arch manifest and
  # tag it (X.Y.Z + latest).
  merge:
    name: Merge ${{ matrix.image }} manifest
    runs-on: ubuntu-latest
    timeout-minutes: 15
    needs: build
    strategy:
      fail-fast: false
      matrix:
        image: [backend, frontend]
    steps:
      - name: Derive version from tag
        id: meta
        run: echo "version=${GITHUB_REF_NAME#v}" >> "$GITHUB_OUTPUT"

      - name: Download digests
        uses: actions/download-artifact@v4
        with:
          path: ${{ runner.temp }}/digests
          pattern: digests-${{ matrix.image }}-*
          merge-multiple: true

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

      - name: Log in to Docker Hub
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Create manifest list and push
        working-directory: ${{ runner.temp }}/digests
        env:
          IMAGE: ${{ env.REGISTRY_NAMESPACE }}/temetro-${{ matrix.image }}
          VERSION: ${{ steps.meta.outputs.version }}
        run: |
          docker buildx imagetools create \
            -t "$IMAGE:$VERSION" \
            -t "$IMAGE:latest" \
            $(printf "$IMAGE@sha256:%s " *)

      - name: Inspect
        env:
          IMAGE: ${{ env.REGISTRY_NAMESPACE }}/temetro-${{ matrix.image }}
          VERSION: ${{ steps.meta.outputs.version }}
        run: docker buildx imagetools inspect "$IMAGE:$VERSION"

  # Both images are published — now cut the GitHub Release with the changelog.
  release:
    name: GitHub Release
    runs-on: ubuntu-latest
    timeout-minutes: 10
    needs: merge
    permissions:
      contents: write # create the GitHub Release (the update check reads this)
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Derive version from tag
        id: meta
        run: echo "version=${GITHUB_REF_NAME#v}" >> "$GITHUB_OUTPUT"

      # Pull this version's section out of CHANGELOG.md so the release has real,
      # human-written notes (the auto "Full Changelog" link is still appended
      # below via generate_release_notes). Falls back to a generic line if the
      # version has no CHANGELOG entry.
      - name: Extract changelog notes
        id: notes
        run: |
          version="${{ steps.meta.outputs.version }}"
          awk -v v="$version" '
            $0 ~ "^## \\[" v "\\]" {flag=1; next}
            /^## \[/ {flag=0}
            flag {print}
          ' CHANGELOG.md | sed '/./,$!d' > release-notes.md
          if [ ! -s release-notes.md ]; then
            echo "Release $version. See the changelog for details." > release-notes.md
          fi

      - name: Create GitHub Release
        uses: softprops/action-gh-release@v2
        with:
          body_path: release-notes.md
          generate_release_notes: true