name: build image

on:
  push:
    branches:
      - main

jobs:
  release_tag:
    runs-on: ubuntu-latest
    outputs:
      new_release: ${{ steps.create_release.outputs.NEW_RELEASE }}
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Get latest release and create new release
        id: create_release
        shell: bash
        run: |
          ### Get latest release.
          latest_release=$(curl -s ${{ env.GITHUB_API_URL }}/repos/${{ env.GITHUB_REPOSITORY }}/releases/latest | jq -r .tag_name)

          ### Cut release into year, month and counter.
          year=$(echo $latest_release | awk -F '.' '//{print $1}')
          month=$(echo $latest_release | awk -F '.' '//{print $2}')
          counter=$(echo $latest_release | awk -F '.' '//{print $3}')

          ### increase the counter, if the release is from the same year and month
          if [[ $(date +'%Y') == $year ]] && [[ $(date +'%m') == $month ]]; then
            counter=$(($counter + 1));
          ### else reset counter
          else
            counter=0;
          fi

          ### Create 
          new_release=$(date +'%Y').$(date +'%m').$counter
          echo "NEW_RELEASE=$new_release" >> "$GITHUB_OUTPUT"
          echo "Release $new_release successfully set"

  build:
    runs-on: ubuntu-latest
    needs: release_tag
    env:
      NEW_RELEASE: ${{ needs.release_tag.outputs.new_release }}
    steps:
      - name: Checkout
        uses: actions/checkout@v4

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

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

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

      - name: Build and push
        uses: docker/build-push-action@v6
        with:
          context: ./docker-build/
          file: ./docker-build/Dockerfile
          platforms: linux/amd64,linux/arm64,linux/arm/v7
          push: true
          cleanup: true
          tags: |
            ${{ secrets.DOCKER_USER }}/docker-owndyndns-netcup:latest
            ${{ secrets.DOCKER_USER }}/docker-owndyndns-netcup:${{ env.NEW_RELEASE }}

  publish_release:
    needs: [release_tag, build]
    runs-on: ubuntu-latest
    env:
      NEW_RELEASE: ${{ needs.release_tag.outputs.new_release }}
      GH_TOKEN: "${{ secrets.RENOVATE_TOKEN }}"
    steps:
      - name: Checkout
        uses: actions/checkout@v4
      
      - name: Create new release
        shell: bash
        run: |
          ### Get latest release "created at" timestemp
          latest_release_time=$(date -d "$(curl -s ${{ env.GITHUB_API_URL }}/repos/${{ env.GITHUB_REPOSITORY }}/releases/latest | jq -r .created_at)")
          echo "Last release from $latest_release_time"

          ### Get last 50 commits
          curl -s "${{ env.GITHUB_API_URL }}/repos/${{ env.GITHUB_REPOSITORY }}/commits?limit=50" > /tmp/last_50_commits.json

          ### Count commits (max. 50) between now and the latest release
          i=0
          fin=0

          while [[ $fin == 0 ]]; do

            commit_time=$(date --date="$(< /tmp/last_50_commits.json jq -r --arg i "$i" '.[$i|tonumber] | .created' )");

            if [[ $(date -d "$latest_release_time" +%s) -le $(date -d "$commit_time" +%s) ]]; then
              echo "$i $commit_time"
              i=$((i + 1))
            else
              fin=1;
            fi
          done

          ### Generate list of commit messages since latest release for release message
          j=0
          message_list=""

          while [[ "$j" != "$i" ]]; do
            message=$(< /tmp/last_50_commits.json jq -r --arg j "$j" '.[$j|tonumber] | .commit.message')
            echo "$j $message"
            message_newline="${message}\n\""
            message_list="$message_list* $message_newline"
            j=$((j + 1))
          done

          ### Generate release message
          datetime=$(env TZ=Europe/Berlin date "+%A, %d.%m.%Y at %R")
          body="$i commit(s) since last relase:\\n\\n$(echo $message_list | sed 's/"//g' | sed 's/README.md docker-build docker-compose.yaml example.config renovate.json/*/g')"
          echo "Release Message Body: $body"

          ### Create release
          curl -d "{
            \"body\": \"$body\",
            \"name\": \"${{ env.NEW_RELEASE }}\",
            \"tag_name\": \"${{ env.NEW_RELEASE }}\",
            \"target_commitish\": \"main\"
          }" ${{ env.GITHUB_API_URL }}/repos/${{ env.GITHUB_REPOSITORY }}/releases -H "Authorization: token ${{ env.GITHUB_TOKEN }}" -H "Content-Type: application/json"