name: Check Docs & Links

on:
  pull_request:
    branches:
      - main
  push:
    branches:
      - main
  schedule:
    - cron: "0 5 * * *"
  workflow_dispatch:

env:
  POETRY_VERSION: "1.7.1"

jobs:
  markdown-link-check:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Check links in Markdown files
        uses: gaurav-nelson/github-action-markdown-link-check@v1
        with:
          folder-path: "examples/,docs/"
          check-modified-files-only: ${{ github.event_name != 'schedule' }}
          file-path: "./README.md"
          config-file: "./.markdown-link-check.config.json"

  notebook-link-check:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
      - name: Set up Python 3.x + Poetry ${{ env.POETRY_VERSION }}
        uses: "./.github/actions/poetry_setup"
        with:
          python-version: "3.11"
          poetry-version: ${{ env.POETRY_VERSION }}
          cache-key: core

      - name: Install dependencies
        run: |
          python -m pip install --upgrade pip
          poetry install --with docs
          poetry run pip install -U pytest pytest-check-links langsmith langchain GitPython

      - name: Check links in notebooks
        env:
          LANGCHAIN_API_KEY: test
        run: |
          if [ "${{ github.event_name }}" == "schedule" ] || [ "${{ github.event_name }}" == "workflow_dispatch" ] || ([ "${{ github.event_name }}" == "push" ] && [ "${{ github.ref }}" == "refs/heads/main" ]); then
            echo "Running link check on all notebooks in examples directory..."
            poetry run pytest -v --check-links-ignore "https://(api|web)\.smith\.langchain\.com/.*" --check-links-ignore "https://x.com/.*" --check-links examples
          else
            echo "Fetching changes from origin/main..."
            git fetch origin main
            echo "Checking for changed notebook files..."
            CHANGED_FILES=$(git diff --name-only --diff-filter=d origin/main | grep '\.ipynb$' || true)
            echo "Changed files: ${CHANGED_FILES}"
            if [ -n "${CHANGED_FILES}" ]; then
              echo "Running link check on changed notebook files..."
              poetry run pytest -v --check-links-ignore "https://(api|web)\.smith\.langchain\.com/.*" --check-links-ignore "https://x.com/.*" --check-links ${CHANGED_FILES} || ([ $? = 5 ] && exit 0 || exit $?)
            else
              echo "No notebook files changed."
            fi
          fi
  check-readmes-synced:
    # This checks that the repo README.md is identical to the libs/langgraph/README.md
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
        with:
          fetch-depth: 1

      - name: Check README.md is in sync
        run: |
            if ! diff -q README.md libs/langgraph/README.md >/dev/null; then
            echo "README.md is out of sync with libs/langgraph/README.md"
            diff -C 3 README.md libs/langgraph/README.md
            exit 1
            fi
