update_dependencies.yaml

name: Update dependencies
on:
  schedule:
    - cron: '0 0 * * 0'  # Runs at 00:00 every Sunday
  workflow_dispatch:
    inputs:
      pr_branch:
        description: 'Branch to push changes to (optional)'
        required: false
        type: string
  workflow_call:
    inputs:
      pr_branch:
        description: 'Branch to push changes to'
        required: true
        type: string

jobs:
  update-deps:
    runs-on: ubuntu-latest
    permissions:
      contents: write
      pull-requests: write
    steps:
      - uses: actions/checkout@v4
        name: Checkout repository
        with:
          fetch-depth: 0  # Fetch all history for all branches
      - name: Checkout target branch
        if: inputs.pr_branch
        run: |
          BRANCH_NAME=$(echo ${{ inputs.pr_branch }} | sed 's|refs/heads/||')
          git fetch origin $BRANCH_NAME
          git checkout $BRANCH_NAME
          git pull origin $BRANCH_NAME

      - name: Setup PDM
        uses: pdm-project/setup-pdm@v4
        with:
          cache: true

      - name: Lock dependencies
        run: pdm lock -G :all

      - name: Export requirements
        run: pdm run export

      - name: Check for changes
        id: git-check
        run: |
          git diff --exit-code --quiet requirements.txt || echo "changed=true" >> $GITHUB_OUTPUT

      - name: Create required label if not exists
        run: |
          # Check if label exists
          LABEL_EXISTS=$(gh label list | grep "automated-dependencies-update" || true)
          if [ -z "$LABEL_EXISTS" ]; then
            echo "Creating automated-dependencies-update label..."
            gh label create "automated-dependencies-update" \
              --color "2DA44E" \
              --description "Automated PR for updating project dependencies"
          fi
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Handle dependency updates
        if: steps.git-check.outputs.changed == 'true'
        run: |
          git config user.name github-actions
          git config user.email github-actions@github.com

          # Function to commit changes
          commit_changes() {
            git add requirements.txt pyproject.toml pdm.lock
            git commit -m "Update dependencies"
          }

          # Function to create PR
          create_pr() {
            local BRANCH=$1
            gh pr create \
              --title "Update dependencies" \
              --body "This PR updates the project dependencies. Please review the changes and merge if everything looks good." \
              --base ${{ github.ref_name }} \
              --head $BRANCH \
              --label "automated-dependencies-update"
          }

          if [ -n "${{ inputs.pr_branch }}" ]; then
            # Push to existing branch
            BRANCH_NAME=$(echo ${{ inputs.pr_branch }} | cut -d'/' -f 3)
            git checkout $BRANCH_NAME
            commit_changes
            git push origin $BRANCH_NAME
          else
            # Check for existing PR - strict search for exact title and our specific branch pattern
            EXISTING_PR=$(gh pr list --search "in:title Update dependencies is:open label:automated-dependencies-update" --json headRefName,number,author -q '.[0]')

            if [ -n "$EXISTING_PR" ]; then
              # Check if PR has our automation label
              BRANCH_NAME=$(echo $EXISTING_PR | jq -r .headRefName)
              
              if [[ "$BRANCH_NAME" == update-dependencies-* ]]; then
                echo "Found valid automated PR with branch $BRANCH_NAME. Updating it."
                git checkout -B $BRANCH_NAME
                commit_changes
                git push -f origin $BRANCH_NAME
              else
                echo "Found PR but wrong branch pattern. Creating new branch."
                NEW_BRANCH="update-dependencies-${{ github.run_id }}"
                git checkout -b $NEW_BRANCH
                commit_changes
                git push origin $NEW_BRANCH
                create_pr $NEW_BRANCH
              fi
            else
              echo "No existing PR found. Creating new branch and PR."
              NEW_BRANCH="update-dependencies-${{ github.run_id }}"
              git checkout -b $NEW_BRANCH
              commit_changes
              git push origin $NEW_BRANCH
              create_pr $NEW_BRANCH
            fi
          fi
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}