name: Build & Push Docker image

on:
  push:
    branches:
      - main
    paths-ignore:
      - '**.md'
  pull_request:
    branches:
      - main
    paths-ignore:
      - '**.md'
  workflow_dispatch:

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

permissions:
  contents: write
  packages: write
  actions: write

jobs:
  build:
    strategy:
      matrix:
        include:
          - platform: linux/amd64
            os: ubuntu-latest
          - platform: linux/arm64
            os: ubuntu-24.04-arm
    runs-on: ${{ matrix.os }}

    steps:
      - name: Prepare platform name
        run: |
          echo "PLATFORM_NAME=${{ matrix.platform }}" | sed 's|/|-|g' >> $GITHUB_ENV

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

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

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

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

      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ghcr.io/${{ steps.lowercase.outputs.owner }}/moontv
          tags: |
            type=ref,event=pr
            type=raw,value=latest,enable={{is_default_branch}}

      - name: Build and push by digest
        id: build
        uses: docker/build-push-action@v5
        with:
          context: .
          file: ./Dockerfile
          platforms: ${{ matrix.platform }}
          labels: ${{ steps.meta.outputs.labels }}
          outputs: type=image,name=ghcr.io/${{ steps.lowercase.outputs.owner }}/moontv,push-by-digest=true,name-canonical=true,push=${{ github.event_name != 'pull_request' }}

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

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

  merge:
    runs-on: ubuntu-latest
    needs:
      - build
    if: github.event_name != 'pull_request'
    steps:
      - name: Download digests
        uses: actions/download-artifact@v4
        with:
          path: /tmp/digests
          pattern: digests-*
          merge-multiple: true

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

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

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

      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ghcr.io/${{ steps.lowercase.outputs.owner }}/moontv
          tags: |
            type=ref,event=branch
            type=ref,event=pr
            type=sha
            type=raw,value=latest,enable={{is_default_branch}}

      - name: Create manifest list and push
        working-directory: /tmp/digests
        run: |
          docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
            $(printf 'ghcr.io/${{ steps.lowercase.outputs.owner }}/moontv@sha256:%s ' *)

      - name: Inspect image
        run: |
          docker buildx imagetools inspect ghcr.io/${{ steps.lowercase.outputs.owner }}/moontv:${{ steps.meta.outputs.version }}

  cleanup:
    runs-on: ubuntu-latest
    needs:
      - merge
    if: always() && github.event_name != 'pull_request'
    steps:
      - name: Delete workflow runs
        uses: Mattraks/delete-workflow-runs@main
        with:
          token: ${{ secrets.GITHUB_TOKEN }}
          repository: ${{ github.repository }}
          retain_days: 0
          keep_minimum_runs: 2