name: "[Deployment] Release PR (reusable)"

# Reusable workflow that opens a release PR from `head` into `base`, auto-approves
# it and (for non-major bumps) merges it. Used by the beta and weekly release
# workflows, which differ only in branch, version suffix and notification wording.

on:
  workflow_call:
    inputs:
      release-label:
        description: 'Human label used in notifications, e.g. "Beta release"'
        required: true
        type: string
      title-prefix:
        description: 'Text inserted before "release" in the PR title/commit, e.g. "automatic "'
        required: false
        default: ""
        type: string
      version-suffix:
        description: 'Suffix appended to the computed version, e.g. "-beta"'
        required: false
        default: ""
        type: string
      body-prefix:
        description: "Extra HTML prepended to the PR body"
        required: false
        default: ""
        type: string
      semver-branch:
        description: "Branch used to compute the next version"
        required: true
        type: string
      head:
        description: "PR head branch"
        required: true
        type: string
      base:
        description: "PR base branch"
        required: true
        type: string
      send-notifications:
        description: "Whether to send Discord notifications"
        required: false
        default: true
        type: boolean

jobs:
  create-and-merge-pr:
    runs-on: ubuntu-latest
    timeout-minutes: 2
    permissions:
      contents: write
      pull-requests: write
    steps:
      - name: Discord notification
        if: inputs.send-notifications
        env:
          DISCORD_WEBHOOK: ${{ secrets.DISCORD_WEBHOOK }}
        uses: Ilshidur/action-discord@0.4.0
        with:
          args: "${{ inputs.release-label }} 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: ${{ inputs.semver-branch }}

      - name: Create pull request
        id: create-pull-request
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          VERSION: "${{ steps.semver.outputs.next }}${{ inputs.version-suffix }}"
        run: >-
          gh pr create
          --title "chore(release): ${{ inputs.title-prefix }}release ${VERSION}"
          --body "${{ inputs.body-prefix }}Detected change to be \`${{ steps.semver.outputs.bump }}\`<br/>Bump version from \`${{ steps.semver.outputs.current }}\` to \`${VERSION}\`"
          --base ${{ inputs.base }}
          --head ${{ inputs.head }}
          --label automerge

      - name: Discord notification
        if: 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 ${{ steps.semver.outputs.next }}${{ inputs.version-suffix }} (new behaviour: ${{ steps.semver.outputs.bump }})"

      - name: Obtain token
        id: obtainApprovalToken
        uses: actions/create-github-app-token@v3
        with:
          private-key: ${{ secrets.RENOVATE_APPROVE_PRIVATE_KEY }}
          client-id: ${{ secrets.RENOVATE_APPROVE_APP_ID }}
          permission-pull-requests: write

      - name: Approve PR
        env:
          GITHUB_TOKEN: ${{ steps.obtainApprovalToken.outputs.token }}
        run: |
          gh pr review --approve --body "Automatically approved by GitHub Action"

      - name: Obtain token
        id: obtainMergeToken
        uses: actions/create-github-app-token@v3
        with:
          private-key: ${{ secrets.RENOVATE_MERGE_PRIVATE_KEY }}
          client-id: ${{ secrets.RENOVATE_MERGE_APP_ID }}
          permission-contents: write # write to the base branch (due to merge)
          permission-pull-requests: write # merge pull request

      - id: automerge
        if: ${{ 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 release branches
          MERGE_COMMIT_MESSAGE: "chore(release): ${{ inputs.title-prefix }}release ${{ steps.semver.outputs.next }}${{ inputs.version-suffix }}"
          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' && 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 ${{ steps.semver.outputs.next }}${{ inputs.version-suffix }}"

      - name: Major Bump Discord notification
        if: ${{ steps.semver.outputs.bump == 'major' && 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 ${{ steps.semver.outputs.next }}${{ inputs.version-suffix }}"

      - name: Discord Fail Notification
        if: failure() && inputs.send-notifications
        env:
          DISCORD_WEBHOOK: ${{ secrets.DISCORD_WEBHOOK }}
        uses: Ilshidur/action-discord@0.4.0
        with:
          args: "The ${{ inputs.release-label }} workflow [run ${{ github.run_number }}](${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}) has failed"