name: "[Deployment] Automatic Weekly Release"

on:
  schedule:
    - cron: "0 19 * * 5" # https://crontab.guru/#0_19_*_*_5
      timezone: Europe/Zurich
  workflow_dispatch:
    inputs:
      send-notifications:
        type: boolean
        required: false
        default: true
        description: Send notifications

permissions:
  contents: write
  pull-requests: write

jobs:
  create-and-merge-pr:
    runs-on: ubuntu-latest
    timeout-minutes: 10
    steps:
      - name: Discord notification
        if: ${{ github.event_name == 'schedule' || inputs.send-notifications }}
        env:
          DISCORD_WEBHOOK: ${{ secrets.DISCORD_WEBHOOK }}
        uses: Ilshidur/action-discord@0.4.0
        with:
          args: "Automatic release has been triggered: [run ${{ github.run_number }}](${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }})"
      - name: Checkout repository
        uses: actions/checkout@v7
        with:
          fetch-depth: 0
      - name: Get Next Version
        id: semver
        uses: ietf-tools/semver-action@v1
        with:
          token: ${{ github.token }}
          branch: dev
          noNewCommitBehavior: silent
          noVersionBumpBehavior: silent
      - name: No release needed
        if: ${{ steps.semver.outputs.bump == '' || steps.semver.outputs.bump == 'none' }}
        run: echo "No release-worthy commits were found since ${{ steps.semver.outputs.current }}." >> "$GITHUB_STEP_SUMMARY"
      - name: Create pull request
        id: create-pull-request
        if: ${{ steps.semver.outputs.bump != '' && steps.semver.outputs.bump != 'none' }}
        run: |
          pr_url="$(gh pr list --base main --head dev --state open --json url --jq '.[0].url // empty')"
          if [[ -z "$pr_url" ]]; then
            pr_url="$(gh pr create \
              --title "chore(release): automatic release ${{ steps.semver.outputs.next }}" \
              --body "**This is an automatic release**.<br/>Manual action may be required for major bumps.<br/>Detected change to be ``${{ steps.semver.outputs.bump }}``<br/>Bump version from ``${{ steps.semver.outputs.current }}`` to ``${{ steps.semver.outputs.next }}``" \
              --base main \
              --head dev \
              --label automerge)"
          fi
          echo "url=$pr_url" >> "$GITHUB_OUTPUT"
          echo "pr_number=${pr_url##*/}" >> "$GITHUB_OUTPUT"
        env:
          GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
      - name: Discord notification
        if: ${{ steps.create-pull-request.outcome == 'success' && (github.event_name == 'schedule' || inputs.send-notifications) }}
        env:
          DISCORD_WEBHOOK: ${{ secrets.DISCORD_WEBHOOK }}
        uses: Ilshidur/action-discord@0.4.0
        with:
          args: "Created a release PR ${{ steps.create-pull-request.outputs.url }} for version ${{ steps.semver.outputs.next }} (new behaviour: ${{ steps.semver.outputs.bump }})"
      - name: Obtain token
        id: obtainApprovalToken
        if: ${{ steps.create-pull-request.outcome == 'success' }}
        uses: actions/create-github-app-token@v3
        with:
          private-key: ${{ secrets.RENOVATE_APPROVE_PRIVATE_KEY }}
          client-id: ${{ vars.RENOVATE_APPROVE_CLIENT_ID }}
          permission-pull-requests: write
      - name: Approve PR
        if: ${{ steps.create-pull-request.outcome == 'success' }}
        env:
          GITHUB_TOKEN: ${{ steps.obtainApprovalToken.outputs.token }}
        run: |
          gh pr review "${{ steps.create-pull-request.outputs.url }}" --approve --body "Automatically approved by GitHub Action"
      - name: Obtain token
        id: obtainMergeToken
        if: ${{ steps.create-pull-request.outcome == 'success' }}
        uses: actions/create-github-app-token@v3
        with:
          private-key: ${{ secrets.RENOVATE_MERGE_PRIVATE_KEY }}
          client-id: ${{ vars.RENOVATE_MERGE_CLIENT_ID }}
          permission-contents: write # write to main branch (due to merge)
          permission-pull-requests: write # merge pull request
      - id: automerge
        if: ${{ steps.create-pull-request.outcome == 'success' && steps.semver.outputs.bump != 'major' }}
        name: automerge
        uses: "pascalgn/automerge-action@v0.16.4"
        env:
          GITHUB_TOKEN: ${{ steps.obtainMergeToken.outputs.token }}
          MERGE_METHOD: merge # we prefer merge commits for merging to main
          MERGE_COMMIT_MESSAGE: "chore(release): automatic release ${{ steps.semver.outputs.next }}"
          MERGE_DELETE_BRANCH: false # never set to true!
          PULL_REQUEST: "${{ steps.create-pull-request.outputs.pr_number }}"
          MERGE_RETRIES: 20 # 20 retries * MERGE_RETRY_SLEEP until step fails
          MERGE_RETRY_SLEEP: 10000 # 10 seconds * MERGE_RETRIES until step fails
          MERGE_REQUIRED_APPROVALS: 0 # do not require approvals

      - name: Merged Discord notification
        if: ${{ steps.automerge.outputs.mergeResult == 'merged' && (github.event_name == 'schedule' || inputs.send-notifications) }}
        env:
          DISCORD_WEBHOOK: ${{ secrets.DISCORD_WEBHOOK }}
        uses: Ilshidur/action-discord@0.4.0
        with:
          args: "Merged PR ${{ steps.create-pull-request.outputs.url }} for release ${{ steps.semver.outputs.next }}"
      - name: Major Bump Discord notification
        if: ${{ steps.semver.outputs.bump == 'major' && (github.event_name == 'schedule' || inputs.send-notifications) }}
        env:
          DISCORD_WEBHOOK: ${{ secrets.DISCORD_WEBHOOK }}
        uses: Ilshidur/action-discord@0.4.0
        with:
          args: "The release PR must be manually merged because the next version is a major version: ${{ steps.create-pull-request.outputs.url }} for release ${{ steps.semver.outputs.next }}"
      - name: Discord Fail Notification
        if: ${{ failure() && (github.event_name == 'schedule' || inputs.send-notifications) }}
        env:
          DISCORD_WEBHOOK: ${{ secrets.DISCORD_WEBHOOK }}
        uses: Ilshidur/action-discord@0.4.0
        with:
          args: "The automatic release workflow [run ${{ github.run_number }}](${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}) has failed"