#/
# @license Apache-2.0
#
# Copyright (c) 2024 The Stdlib Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#/

# Workflow name:
name: labeler

# Workflow triggers:
on:
  pull_request_target:
    types:
      - opened
      - closed
      - synchronize
      - reopened
      - edited
      - review_requested
      - review_request_removed
      - ready_for_review
      - converted_to_draft
      - labeled

# Workflow jobs:
jobs:

  # Define a job which automatically labels pull requests based on the contents of the pull request:
  labeler:

    # Define job name:
    name: 'Labeler'

    # Only run this job if the pull request did not have label `automated-pr`:
    if: contains(github.event.pull_request.labels.*.name, 'automated-pr') == false

    # Define job permissions:
    permissions:
      contents: read

    # Define the type of virtual host machine:
    runs-on: ubuntu-latest

    # Define the sequence of job steps:
    steps:

      # Automatically label pull requests:
      - name: 'Automatically label pull requests'
        # Pin action to full length commit SHA
        uses: actions/labeler@634933edcd8ababfe52f92936142cc22ac488b1b # v6.0.1
        with:
          configuration-path: .github/labeler.yml
          repo-token: ${{ secrets.STDLIB_BOT_PAT_REPO_WRITE }}

      # Add "First-time Contributor" label if PR is from a first-time contributor:
      - name: 'Add "First-time Contributor" label if PR is from a first-time contributor'
        if: ${{ github.event.action == 'opened' || github.event.action == 'reopened' }}
        # Pin action to full-length commit SHA
        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
        with:
          github-token: ${{ secrets.STDLIB_BOT_PAT_REPO_WRITE }}
          script: |
            const { data: pr } = await github.rest.pulls.get({
              'owner': context.repo.owner,
              'repo': context.repo.repo,
              'pull_number': context.payload.pull_request.number
            });
            if ( pr.author_association === 'FIRST_TIME_CONTRIBUTOR' ) {
              const labels = context.payload.pull_request.labels.map( label => label.name );
              if ( !labels.includes( 'First-time Contributor' ) ) {
                await github.rest.issues.addLabels({
                  'owner': context.repo.owner,
                  'repo': context.repo.repo,
                  'issue_number': context.payload.pull_request.number,
                  'labels': [ 'First-time Contributor' ]
                });
              }
            }

      # Add "Needs Review" label when PR is opened and not a draft:
      - name: 'Add "Needs Review" label if PR is opened and not draft'
        if: ${{ github.event.action == 'opened' && github.event.pull_request.draft == false }}
        # Pin action to full length commit SHA
        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
        with:
          github-token: ${{ secrets.STDLIB_BOT_PAT_REPO_WRITE }}
          script: |
            await github.rest.issues.addLabels({
              'owner': context.repo.owner,
              'repo': context.repo.repo,
              'issue_number': context.payload.pull_request.number,
              'labels': [ 'Needs Review' ]
            })

      # Add "Needs Review" label when PR is marked ready for review or review is requested:
      - name: 'Add "Needs Review" label if PR is ready for review or review is requested'
        if: ${{ github.event.action == 'ready_for_review' || github.event.action == 'review_requested' }}
        # Pin action to full length commit SHA
        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
        with:
          github-token: ${{ secrets.STDLIB_BOT_PAT_REPO_WRITE }}
          script: |
            await github.rest.issues.addLabels({
              'owner': context.repo.owner,
              'repo': context.repo.repo,
              'issue_number': context.payload.pull_request.number,
              'labels': [ 'Needs Review' ]
            })

      # Remove "Needs Review" label when PR is converted to draft or closed:
      - name: 'Remove "Needs Review" label if PR is converted to draft or closed'
        if: ${{ github.event.action == 'converted_to_draft' || github.event.action == 'closed' }}
        # Pin action to full length commit SHA
        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
        with:
          github-token: ${{ secrets.STDLIB_BOT_PAT_REPO_WRITE }}
          script: |
            try {
              await github.rest.issues.removeLabel({
                'owner': context.repo.owner,
                'repo': context.repo.repo,
                'issue_number': context.payload.pull_request.number,
                'name': 'Needs Review'
              })
            } catch ( error ) {
              console.log( 'Error removing label: %s', error.message );
            }

      # Remove "Ready To Merge" label when PR is merged:
      - name: 'Remove "Ready To Merge" label if PR is merged'
        if: ${{ github.event.action == 'closed' && github.event.pull_request.merged == true }}
        # Pin action to full length commit SHA
        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
        with:
          github-token: ${{ secrets.STDLIB_BOT_PAT_REPO_WRITE }}
          script: |
            try {
              await github.rest.issues.removeLabel({
                'owner': context.repo.owner,
                'repo': context.repo.repo,
                'issue_number': context.payload.pull_request.number,
                'name': 'Ready To Merge'
              })
            } catch ( error ) {
              console.log( 'Error removing label: %s', error.message );
            }

      # Remove "Needs Review" and "Needs Changes" labels when "Ready To Merge" is assigned:
      - name: 'Remove "Needs Review" and "Needs Changes" labels when "Ready To Merge" is assigned'
        if: ${{ github.event.action == 'labeled' && github.event.label.name == 'Ready To Merge' }}
        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
        with:
          github-token: ${{ secrets.STDLIB_BOT_PAT_REPO_WRITE }}
          script: |
            const labelsToRemove = [ 'Needs Review', 'Needs Changes' ];
            for ( const label of labelsToRemove ) {
              try {
                await github.rest.issues.removeLabel({
                  'owner': context.repo.owner,
                  'repo': context.repo.repo,
                  'issue_number': context.payload.pull_request.number,
                  'name': label
                })
              } catch ( error ) {
                console.log( 'Error removing label %s: %s', label, error.message );
              }
            }

      # Remove "First-time Contributor" label from other open PRs of same author if PR is merged:
      - name: 'Remove "First-time Contributor" label from other open PRs of same author if PR is merged'
        if: ${{ github.event.action == 'closed' && github.event.pull_request.merged == true }}
        # Pin action to full length commit SHA
        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
        with:
          github-token: ${{ secrets.STDLIB_BOT_PAT_REPO_WRITE }}
          script: |
            const prAuthor = context.payload.pull_request.user.login;
            const { owner, repo } = context.repo;

            // Search for all open PRs from the PR author:
            const query = `repo:${owner}/${repo} type:pr state:open author:${prAuthor}`;
            const response = await github.rest.search.issuesAndPullRequests({
              'q': query,
              'per_page': 100
            });

            const pullRequests = response.data.items;
            for ( const pull of pullRequests ) {
              if ( pull.user.login === prAuthor ) {
                try {
                  await github.rest.issues.removeLabel({
                    'owner': context.repo.owner,
                    'repo': context.repo.repo,
                    'issue_number': pull.number,
                    'name': 'First-time Contributor'
                  });
                } catch ( error ) {
                  console.log( 'Error removing "First-time Contributor" label from PR #%d: %s', pull.number, error.message );
                }
              }
            }