# Part of the Carbon Language project, under the Apache License v2.0 with LLVM
# Exceptions. See /LICENSE for license information.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

# Applies mutual exclusivity between states labels:
# - proposal draft
# - proposal rfc
# - proposal accepted
# - proposal declined
# - proposal deferred
#
# The "proposal" label is always applied in order to make searching for all
# proposals (regardless of state) easy, although it will typically already be
# present.

name: Proposal labeled
on:
  pull_request_target:
    types:
      - labeled

permissions:
  pull-requests: write # For gh to edit labels.

jobs:
  proposal_labeled:
    runs-on: ubuntu-latest
    steps:
      - name: Harden Runner
        uses: step-security/harden-runner@17d0e2bd7d51742c71671bd19fa12bdc9d40a3d6 # v2.8.1
        with:
          disable-sudo: true
          egress-policy: block
          # prettier-ignore
          allowed-endpoints: >
            api.github.com:443

      - name: draft
        if: |
          github.event.label.name == 'proposal draft'
        run: |
          gh pr edit "${PR}" \
            --remove-label "proposal rfc" \
            --remove-label "proposal accepted" \
            --remove-label "proposal declined" \
            --remove-label "proposal deferred" \
            --add-label "proposal"
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          PR: ${{ github.event.pull_request.html_url }}

      - name: rfc
        if: |
          github.event.label.name == 'proposal rfc'
        run: |
          gh pr edit "${PR}" \
            --remove-label "proposal draft" \
            --remove-label "proposal accepted" \
            --remove-label "proposal declined" \
            --remove-label "proposal deferred" \
            --add-label "proposal"
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          PR: ${{ github.event.pull_request.html_url }}

      - name: accepted
        if: |
          github.event.label.name == 'proposal accepted'
        run: |
          gh pr edit "${PR}" \
            --remove-label "proposal draft" \
            --remove-label "proposal rfc" \
            --remove-label "proposal declined" \
            --remove-label "proposal deferred" \
            --add-label "proposal"
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          PR: ${{ github.event.pull_request.html_url }}

      - name: declined
        if: |
          github.event.label.name == 'proposal declined'
        run: |
          gh pr edit "${PR}" \
            --remove-label "proposal draft" \
            --remove-label "proposal rfc" \
            --remove-label "proposal accepted" \
            --remove-label "proposal deferred" \
            --add-label "proposal"
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          PR: ${{ github.event.pull_request.html_url }}

      - name: deferred
        if: |
          github.event.label.name == 'proposal deferred'
        run: |
          gh pr edit "${PR}" \
            --remove-label "proposal draft" \
            --remove-label "proposal rfc" \
            --remove-label "proposal accepted" \
            --remove-label "proposal declined" \
            --add-label "proposal"
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          PR: ${{ github.event.pull_request.html_url }}