name: DCO

on:
  push:
    branches: [ "main" ]
  pull_request:
    branches: [ "main" ]
  workflow_dispatch:

env:
  CARGO_UNSTABLE_SPARSE_REGISTRY: true
  CARGO_TERM_COLOR: always

jobs:
  check-commit-signatures:
    name: Check all commit signatures
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0  # 获取完整提交历史以访问所有PR提交

      - name: Verify all commits are signed
        run: |
          if [ -n "$GITHUB_BASE_REF" ]; then
            echo "Pull Request detected. Using base ref: $GITHUB_BASE_REF"
            # 拉取目标分支的最新状态
            git fetch origin $GITHUB_BASE_REF
            RANGE="origin/$GITHUB_BASE_REF..HEAD"
          else
            echo "Not Pull Request, checking one latest commit"
            # 如果不是 PR，则只检查最近一次提交（可根据实际情况调整）
            RANGE="HEAD~1..HEAD"
          fi

          commits=$(git rev-list $RANGE)
          
          if [ -z "$commits" ]; then
            echo "Error: No commits found in the pull request range."
            exit 1
          fi

          PASS=1
          for COMMIT in $commits; do
            echo "Checking commit $COMMIT"

            PARENTS=$(git log -1 --format='%P' "$COMMIT")
            NUM_PARENTS=$(echo "$PARENTS" | wc -w)
            if [ "$NUM_PARENTS" -gt 1 ]; then
              echo "Commit $COMMIT is a merge commit, skipping signature check."
              continue
            fi

            COMMIT_MSG=$(git log -1 --format=%B $COMMIT)
            if echo "$COMMIT_MSG" | grep -q "Signed-off-by:"; then
              echo ":) Commit $COMMIT is signed."
            else
              echo ":( Commit $COMMIT is NOT signed."
              echo "Commit information: "
              git log -1 $COMMIT
              PASS=0
            fi
          done

          if [ "$PASS" -eq 1 ]; then
            echo "✔ All commits are properly signed!"
          else
            echo "❌ At least one commit is not properly signed (using Signed-off-by)."
            exit 1
          fi

      - name: Print authors' information
        run: |
          if [ -n "$GITHUB_BASE_REF" ]; then
            git fetch origin $GITHUB_BASE_REF
            RANGE="origin/$GITHUB_BASE_REF..HEAD"
          else
            RANGE="HEAD~1..HEAD"
          fi
          git log --pretty="format:%h - %an <%ae> [%G?]" $RANGE