name: Build

on:
  push:
    branches:
      - main
      - "releases/*"
env:
  MIX_ENV: prod
  GH_TOKEN: ${{ github.token }}
  REGISTRY_IMAGE: wandererltd/community-edition

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

permissions:
  contents: write

jobs:
  build:
    name: 🛠 Build
    runs-on: ubuntu-22.04
    if: ${{ (github.ref == 'refs/heads/main') && github.event_name == 'push' }}
    permissions:
      checks: write
      contents: write
      packages: write
      attestations: write
      id-token: write
      pull-requests: write
      repository-projects: write
    strategy:
      matrix:
        otp: ["27"]
        elixir: ["1.17"]
        node-version: ["18.x"]
    outputs:
      commit_hash: ${{ steps.generate-changelog.outputs.commit_hash }}
    steps:
      - name: Prepare
        run: |
          platform=${{ matrix.platform }}
          echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV

      - name: Setup Elixir
        uses: erlef/setup-beam@v1
        with:
          otp-version: ${{matrix.otp}}
          elixir-version: ${{matrix.elixir}}
        # nix build would also work here because `todos` is the default package
      - name: ⬇️ Checkout repo
        uses: actions/checkout@v3
        with:
          fetch-depth: 0
      - name: 😅 Cache deps
        id: cache-deps
        uses: actions/cache@v4
        env:
          cache-name: cache-elixir-deps
        with:
          path: |
            deps
          key: ${{ runner.os }}-mix-${{ matrix.elixir }}-${{ matrix.otp }}-${{ hashFiles('**/mix.lock') }}
          restore-keys: |
            ${{ runner.os }}-mix-${{ matrix.elixir }}-${{ matrix.otp }}-
      - name: 😅 Cache compiled build
        id: cache-build
        uses: actions/cache@v4
        env:
          cache-name: cache-compiled-build
        with:
          path: |
            _build
          key: ${{ runner.os }}-build-${{ hashFiles('**/mix.lock') }}-${{ hashFiles( '**/lib/**/*.{ex,eex}', '**/config/*.exs', '**/mix.exs' ) }}
          restore-keys: |
            ${{ runner.os }}-build-${{ hashFiles('**/mix.lock') }}-
            ${{ runner.os }}-build-
      # Step: Download project dependencies. If unchanged, uses
      # the cached version.
      - name: 🌐 Install dependencies
        run: mix deps.get --only "prod"

      # Step: Compile the project treating any warnings as errors.
      # Customize this step if a different behavior is desired.
      - name: 🛠 Compiles without warnings
        if: steps.cache-build.outputs.cache-hit != 'true'
        run: mix compile

      - name: Generate Changelog & Update Tag Version
        id: generate-changelog
        run: |
          git config --global user.name 'CI'
          git config --global user.email 'ci@users.noreply.github.com'
          mix git_ops.release --force-patch --yes
          git push --follow-tags
          echo "commit_hash=$(git rev-parse HEAD)" >> $GITHUB_OUTPUT

  docker:
    name: 🛠 Build Docker Images
    needs: build
    runs-on: ubuntu-22.04
    outputs:
      release-tag: ${{ steps.get-latest-tag.outputs.tag }}
      release-notes: ${{ steps.get-content.outputs.string }}
    permissions:
      checks: write
      contents: write
      packages: write
      attestations: write
      id-token: write
      pull-requests: write
      repository-projects: write
    strategy:
      fail-fast: false
      matrix:
        platform:
          - linux/amd64
          - linux/arm64
    steps:
      - name: Prepare
        run: |
          platform=${{ matrix.platform }}
          echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV

      - name: ⬇️ Checkout repo
        uses: actions/checkout@v3
        with:
          ref: ${{ needs.build.outputs.commit_hash }}
          fetch-depth: 0

      - name: Prepare Changelog
        run: |
          yes | cp -rf CHANGELOG.md priv/changelog/CHANGELOG.md
          sed -i '1i%{title: "Change Log"}\n\n---\n' priv/changelog/CHANGELOG.md

      - name: Get Release Tag
        id: get-latest-tag
        uses: "WyriHaximus/github-action-get-previous-tag@v1"
        with:
          fallback: 1.0.0

      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY_IMAGE }}

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3

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

      - name: Login to DockerHub
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.WANDERER_DOCKER_USER }}
          password: ${{ secrets.WANDERER_DOCKER_PASSWORD }}

      - name: Build and push
        id: build
        uses: docker/build-push-action@v6
        with:
          push: true
          context: .
          file: ./Dockerfile
          cache-from: type=gha
          cache-to: type=gha,mode=max
          labels: ${{ steps.meta.outputs.labels }}
          platforms: ${{ matrix.platform }}
          outputs: type=image,"name=${{ env.REGISTRY_IMAGE }}",push-by-digest=true,name-canonical=true,push=true
          build-args: |
            MIX_ENV=prod
            BUILD_METADATA=${{ steps.meta.outputs.json }}

      - 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_PAIR }}
          path: /tmp/digests/*
          if-no-files-found: error
          retention-days: 1

      - uses: markpatterson27/markdown-to-output@v1
        id: extract-changelog
        with:
          filepath: CHANGELOG.md

      - name: Get content
        uses: 2428392/gh-truncate-string-action@v1.3.0
        id: get-content
        with:
          stringToTruncate: |
            📣 Wanderer new release available 🎉

            **Version**: ${{ steps.get-latest-tag.outputs.tag }}

            ${{ steps.extract-changelog.outputs.body }}
          maxLength: 500
          truncationSymbol: "…"

  merge:
    runs-on: ubuntu-latest
    needs:
      - docker
    steps:
      - name: Download digests
        uses: actions/download-artifact@v4
        with:
          path: /tmp/digests
          pattern: digests-*
          merge-multiple: true

      - name: Login to Docker Hub
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.WANDERER_DOCKER_USER }}
          password: ${{ secrets.WANDERER_DOCKER_PASSWORD }}

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

      - name: Docker meta
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: |
            ${{ env.REGISTRY_IMAGE }}
          tags: |
            type=ref,event=branch
            type=ref,event=pr
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=semver,pattern={{version}},value=${{ needs.docker.outputs.release-tag }}

      - 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") \
            $(printf '${{ env.REGISTRY_IMAGE }}@sha256:%s ' *)

      - name: Inspect image
        run: |
          docker buildx imagetools inspect ${{ env.REGISTRY_IMAGE }}:${{ steps.meta.outputs.version }}

  create-release:
    name: 🏷 Create Release
    runs-on: ubuntu-22.04
    needs: [docker, merge]
    if: ${{ github.ref == 'refs/heads/main' && github.event_name == 'push' }}
    steps:
      - name: ⬇️ Checkout repo
        uses: actions/checkout@v3
        with:
          fetch-depth: 0

      - name: 🏷 Create Draft Release
        uses: softprops/action-gh-release@v1
        with:
          tag_name: ${{ needs.docker.outputs.release-tag }}
          name: Release ${{ needs.docker.outputs.release-tag }}
          body: |
            ## Info
            Commit ${{ github.sha }} was deployed to `staging`. [See code diff](${{ github.event.compare }}).

            It was initialized by [${{ github.event.sender.login }}](${{ github.event.sender.html_url }}).

            ## How to Promote?
            In order to promote this to prod, edit the draft and press **"Publish release"**.
          draft: true

      - name: Discord Webhook Action
        uses: tsickert/discord-webhook@v5.3.0
        with:
          webhook-url: ${{ secrets.DISCORD_WEBHOOK_URL }}
          content: ${{ needs.docker.outputs.release-notes }}