# OpenCodeReview - GitHub Actions PR Auto-Review Demo
#
# Demonstrates invoking the reusable action for both automatic PR review
# (pull_request_target: opened/synchronize/reopened) and on-demand re-review
# via comments starting with '/open-code-review' or '@open-code-review'.
#
# Required secrets/vars (Settings -> Secrets and variables -> Actions):
#   secret    OCR_LLM_URL            LLM API endpoint
#   secret    OCR_LLM_AUTH_TOKEN     LLM auth token (mapped to OCR_LLM_TOKEN)
#   variable  OCR_LLM_MODEL          model name
#   variable  OCR_LLM_USE_ANTHROPIC  'true' for Anthropic, 'false' for OpenAI-compatible
#
# For the full list of action inputs/outputs and the four comment-posting modes
# (sticky / incremental), see action.yml at the repo root.

name: OpenCodeReview PR Review

# Conditional concurrency group.
#
# GitHub Actions evaluates concurrency BEFORE job-level if-conditions. With a
# flat group (ocr-<pr_number>), every comment on the PR — even an unrelated
# conversation reply that will be skipped — enters the same group and, because
# cancel-in-progress is true, cancels any in-progress review. The result: a
# single normal comment kills a running review, and you see "two runs, one
# cancelled" in the Actions tab.
#
# Fix: matching events (PR events + /open-code-review comments) share a per-PR
# group so a new review cancels any stale one for the same PR. Non-matching
# comments land in a unique noop-<run_id> group that can never collide with a
# real review, so they are skipped instantly without disrupting anything.
concurrency:
  group: >-
    ${{
      (
        github.event_name == 'pull_request_target'
        || (
          github.event_name == 'issue_comment'
          && github.event.issue.pull_request
          && github.event.comment.user.type != 'Bot'
          && (
            github.event.comment.author_association == 'MEMBER'
            || github.event.comment.author_association == 'OWNER'
            || github.event.comment.author_association == 'COLLABORATOR'
          )
          && (
            startsWith(github.event.comment.body, '/open-code-review')
            || startsWith(github.event.comment.body, '@open-code-review')
          )
        )
      )
      && format('ocr-{0}', github.event.pull_request.number || github.event.issue.number)
      || format('noop-{0}', github.run_id)
    }}
  cancel-in-progress: true

on:
  # Use pull_request_target instead of pull_request so that secrets are
  # available even for PRs from forks. This is safe because the reusable
  # action only reads the diff and does not execute any code from the PR.
  pull_request_target:
    types: [opened, synchronize, reopened]
  issue_comment:
    types: [created]

permissions:
  contents: read
  pull-requests: write

jobs:
  code-review:
    runs-on: ubuntu-latest
    timeout-minutes: 30
    # Run on PR events, or on human-authored comments starting with trigger
    # keywords. Bot comments are excluded as a safety net: GITHUB_TOKEN already
    # suppresses events from bot-posted comments, but a PAT/App token would not.
    # issue_comment triggers are further gated on author_association so only
    # MEMBER/OWNER/COLLABORATOR users can spend LLM quota via re-review.
    if: |
      github.event_name == 'pull_request_target'
      || (
        github.event_name == 'issue_comment'
        && github.event.issue.pull_request
        && github.event.comment.user.type != 'Bot'
        && (
          github.event.comment.author_association == 'MEMBER'
          || github.event.comment.author_association == 'OWNER'
          || github.event.comment.author_association == 'COLLABORATOR'
        )
        && (
          startsWith(github.event.comment.body, '/open-code-review')
          || startsWith(github.event.comment.body, '@open-code-review')
        )
      )
    steps:
      - name: Get PR context
        id: pr-context
        if: github.event_name == 'issue_comment'
        uses: actions/github-script@v7
        with:
          script: |
            // For issue_comment events, resolve PR base/head so the action
            // can review the right diff (issue_comment has no top-level
            // pull_request payload fields).
            const prNumber = context.issue.number;
            const { data: pullRequest } = await github.rest.pulls.get({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: prNumber
            });
            core.setOutput('base_ref', pullRequest.base.ref);
            core.setOutput('head_sha', pullRequest.head.sha);

      - name: Run OpenCodeReview
        uses: alibaba/open-code-review@main
        with:
          llm_url: ${{ secrets.OCR_LLM_URL }}
          llm_auth_token: ${{ secrets.OCR_LLM_AUTH_TOKEN }}
          llm_model: ${{ vars.OCR_LLM_MODEL }}
          llm_use_anthropic: ${{ vars.OCR_LLM_USE_ANTHROPIC }}
          # For issue_comment triggers, pass the resolved refs; for
          # pull_request_target the action resolves them from the event.
          base_ref: ${{ steps.pr-context.outputs.base_ref }}
          head_sha: ${{ steps.pr-context.outputs.head_sha }}