name: pr-review

on:
  pull_request_target:
    types: [opened, synchronize, reopened, ready_for_review]
  issue_comment:
    types: [created]
  pull_request_review_comment:
    types: [created]

concurrency:
  # PR conversation comments arrive as `issue_comment` events, so their PR number
  # is exposed as `github.event.issue.number`.
  group: pr-review-${{ github.event.pull_request.number || github.event.issue.number }}
  cancel-in-progress: true

jobs:
  review:
    if: |
      (github.event_name == 'pull_request_target' && github.event.pull_request.draft == false) ||
      (github.event_name == 'issue_comment' && github.event.issue.pull_request && (startsWith(github.event.comment.body, '/oc-review') || contains(github.event.comment.body, ' /oc-review'))) ||
      (github.event_name == 'pull_request_review_comment' && (startsWith(github.event.comment.body, '/oc-review') || contains(github.event.comment.body, ' /oc-review')))
    runs-on: ubuntu-latest
    permissions:
      contents: read
      pull-requests: write
      issues: write
    steps:
      - name: Checkout repository
        uses: actions/checkout@v6
        with:
          fetch-depth: 1

      - name: Resolve pull request context
        id: pr
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          EVENT_PR_NUMBER: ${{ github.event.pull_request.number || github.event.issue.number }}
        run: |
          pr_json="$(gh pr view "$EVENT_PR_NUMBER" --json number,url,title,body,author,baseRefName,headRefName,headRepositoryOwner,isDraft)"

          if [ "$(printf '%s' "$pr_json" | jq -r '.isDraft')" = "true" ]; then
            echo "draft=true" >> "$GITHUB_OUTPUT"
            exit 0
          fi

          {
            echo "draft=false"
            echo "number=$(printf '%s' "$pr_json" | jq -r '.number')"
            echo "url=$(printf '%s' "$pr_json" | jq -r '.url')"
            echo "title=$(printf '%s' "$pr_json" | jq -r '.title')"
            echo "author=$(printf '%s' "$pr_json" | jq -r '.author.login')"
            echo "base_ref=$(printf '%s' "$pr_json" | jq -r '.baseRefName')"
            echo "head_ref=$(printf '%s' "$pr_json" | jq -r '.headRefName')"
            echo "head_repo_owner=$(printf '%s' "$pr_json" | jq -r '.headRepositoryOwner.login')"
            echo "body<<EOF"
            printf '%s\n' "$pr_json" | jq -r '.body // ""'
            echo "EOF"
          } >> "$GITHUB_OUTPUT"

      - name: Check review safety
        if: steps.pr.outputs.draft == 'false'
        id: safety
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          PR_NUMBER: ${{ steps.pr.outputs.number }}
        run: |
          changed_sensitive_files="$(gh pr diff "$PR_NUMBER" --name-only | grep -E '^(\.github/workflows/pr-review\.yml|\.opencode/agent/pr-review\.md)$' || true)"

          if [ -n "$changed_sensitive_files" ]; then
            {
              echo "safe=false"
              echo "changed_sensitive_files<<EOF"
              echo "$changed_sensitive_files"
              echo "EOF"
            } >> "$GITHUB_OUTPUT"
            exit 0
          fi

          echo "safe=true" >> "$GITHUB_OUTPUT"

      - name: Skip unsafe review
        if: steps.pr.outputs.draft == 'false' && steps.safety.outputs.safe != 'true'
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          PR_NUMBER: ${{ steps.pr.outputs.number }}
          CHANGED_SENSITIVE_FILES: ${{ steps.safety.outputs.changed_sensitive_files }}
        run: |
          gh pr comment "$PR_NUMBER" --body "<h3>Code Review Skipped</h3>

          Automated review was skipped because this PR changes review automation files:

          \`\`\`
          $CHANGED_SENSITIVE_FILES
          \`\`\`

          A maintainer should review those changes manually before running automated review."

      - name: Install opencode
        if: steps.pr.outputs.draft == 'false' && steps.safety.outputs.safe == 'true'
        run: curl -fsSL https://opencode.ai/install | bash

      - name: Review pull request
        if: steps.pr.outputs.draft == 'false' && steps.safety.outputs.safe == 'true'
        env:
          OPENCODE_API_KEY: ${{ secrets.OPENCODE_API_KEY }}
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          PR_URL: ${{ steps.pr.outputs.url }}
          PR_NUMBER: ${{ steps.pr.outputs.number }}
          PR_TITLE: ${{ steps.pr.outputs.title }}
          PR_BODY: ${{ steps.pr.outputs.body }}
          PR_AUTHOR: ${{ steps.pr.outputs.author }}
          PR_BASE_REF: ${{ steps.pr.outputs.base_ref }}
          PR_HEAD_REF: ${{ steps.pr.outputs.head_ref }}
          PR_HEAD_REPO_OWNER: ${{ steps.pr.outputs.head_repo_owner }}
        run: |
          opencode run --agent pr-review "A pull request in the OpenChamber repository needs code review.

          PR: $PR_URL
          Number: $PR_NUMBER
          Author: $PR_AUTHOR
          Base: $PR_BASE_REF
          Head: $PR_HEAD_REPO_OWNER:$PR_HEAD_REF

          Title: $PR_TITLE

          $PR_BODY"