name: Check for Undesirable Code

on:
  pull_request:
    types: [edited, opened, synchronize, reopened]

permissions:
  contents: read

jobs:
  check_undesirable_code:
    if: "!contains(github.event.pull_request.labels.*.name, 'ci:allow-undesirable')"
    runs-on: ubuntu-latest

    steps:
      - name: Checkout code
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
        with:
          persist-credentials: false
          fetch-depth: 0 # Fetch all history for comparison
          sparse-checkout: true
          ref: ${{ github.event.pull_request.head.ref }}
          repository: ${{ github.event.pull_request.head.repo.full_name }}
      - name: Check for undesirable code
        run: |
          #!/bin/bash
          set -e

          BASE_BRANCH=${{ github.event.pull_request.base.ref }}
          echo "Base branch is: $BASE_BRANCH"
          BASE_BRANCH_REF=${{ github.event.pull_request.base.sha }}
          echo "Base branch ref for this PR is: $BASE_BRANCH_REF"

          echo "### Calculating diff for '*.spec.ts' files..."
          git diff $BASE_BRANCH_REF -- '*.spec.ts' > diff_spec_ts.txt

          echo "### Counting additions and deletions of snapshots..."
          ADDED=$(grep '^+' diff_spec_ts.txt | grep -v '^+++' | grep -c -E '\.toMatch(Snapshot|InlineSnapshot)\(' || true)
          DELETED=$(grep '^-' diff_spec_ts.txt | grep -v '^---' | grep -c -E '\.toMatch(Snapshot|InlineSnapshot)\(' || true)

          if [ "$ADDED" -gt "$DELETED" ]; then
              echo "❌ Error: Snapshots have been added in this PR. Use toMatch instead."
              exit 1
          else
              echo "✅ Snapshot code check passed."
          fi

          echo "### Calculating file changes in '__fixtures__' directories..."
          git diff --name-status $BASE_BRANCH_REF > diff_name_status.txt

          echo "### Processing added files in '__fixtures__' directories..."
          ADDED_FIXTURES=$(grep '^A' diff_name_status.txt | awk '{print $2}' | grep '/__fixtures__/' || true)
          NUM_ADDED_FIXTURES=$(echo "$ADDED_FIXTURES" | grep -c . || echo 0)
          echo "Added files in '__fixtures__':"
          echo "$ADDED_FIXTURES"
          echo "Total number of added files in '__fixtures__': $NUM_ADDED_FIXTURES"

          echo "### Processing deleted files in '__fixtures__' directories..."
          DELETED_FIXTURES=$(grep '^D' diff_name_status.txt | awk '{print $2}' | grep '/__fixtures__/' || true)
          NUM_DELETED_FIXTURES=$(echo "$DELETED_FIXTURES" | grep -c . || echo 0)
          echo "Deleted files in '__fixtures__':"
          echo "$DELETED_FIXTURES"
          echo "Total number of deleted files in '__fixtures__': $NUM_DELETED_FIXTURES"

          echo "### Processing renamed files involving '__fixtures__' directories..."
          RENAME_ENTRIES=$(grep '^R' diff_name_status.txt || true)
          echo "$RENAME_ENTRIES"

          while read -r line; do
              if [ -z "$line" ]; then
                  continue
              fi
              OLD_PATH=$(echo "$line" | awk '{print $2}')
              NEW_PATH=$(echo "$line" | awk '{print $3}')

              echo "Processing rename: $OLD_PATH -> $NEW_PATH"

              OLD_IN_FIXTURES=0
              NEW_IN_FIXTURES=0

              if echo "$OLD_PATH" | grep -q '/__fixtures__/'; then
                  OLD_IN_FIXTURES=1
              fi

              if echo "$NEW_PATH" | grep -q '/__fixtures__/'; then
                  NEW_IN_FIXTURES=1
              fi

              if [ "$OLD_IN_FIXTURES" -eq 1 ] && [ "$NEW_IN_FIXTURES" -eq 0 ]; then
                  NUM_DELETED_FIXTURES=$((NUM_DELETED_FIXTURES + 1))
                  echo "File moved out of '__fixtures__': $OLD_PATH -> $NEW_PATH"
              elif [ "$OLD_IN_FIXTURES" -eq 0 ] && [ "$NEW_IN_FIXTURES" -eq 1 ]; then
                  NUM_ADDED_FIXTURES=$((NUM_ADDED_FIXTURES + 1))
                  echo "File moved into '__fixtures__': $OLD_PATH -> $NEW_PATH"
              else
                  echo "File renamed within the same directory: $OLD_PATH -> $NEW_PATH"
              fi
          done <<< "$RENAME_ENTRIES"

          echo "Updated total number of added files in '__fixtures__': $NUM_ADDED_FIXTURES"
          echo "Updated total number of deleted files in '__fixtures__': $NUM_DELETED_FIXTURES"

          if [ "$NUM_ADDED_FIXTURES" -gt "$NUM_DELETED_FIXTURES" ]; then
              echo "❌ Error: More files have been added to '__fixtures__' directories than deleted."
              exit 1
          else
              echo "✅ Fixtures files check passed."
          fi

          echo "🎉 All checks passed successfully."
      - name: Check TODOs for references resolved by this PR
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
        with:
          script: |
            const body = context.payload.pull_request.body ?? '';
            const closingPattern = /\b(?:close[sd]?|fix(?:es|ed)?|resolve[sd]?):?\s+(?:https:\/\/github\.com\/renovatebot\/renovate\/(?:issues|discussions)\/|#)(?<referenceNumber>\d+)\b/gi;
            const referenceNumbers = new Set();

            for (const match of body.matchAll(closingPattern)) {
              referenceNumbers.add(match.groups.referenceNumber);
            }

            if (referenceNumbers.size === 0) {
              core.info('No issues or discussions are resolved by this pull request');
              return;
            }

            const references = [...referenceNumbers].join('|');
            const todoPattern = `TODO.*#(${references})([^0-9]|$)`;
            const result = await exec.getExecOutput(
              'git',
              ['grep', '-n', '-E', todoPattern, '--', '.'],
              { ignoreReturnCode: true, silent: true },
            );

            if (result.exitCode === 1) {
              core.info(
                'No TODOs reference issues or discussions resolved by this pull request',
              );
              return;
            }

            if (result.exitCode !== 0) {
              core.setFailed(`git grep failed: ${result.stderr}`);
              return;
            }

            core.setFailed(
              `Remove or update TODOs that reference issues or discussions resolved by this pull request:\n${result.stdout}`,
            );