name: Check cpp / md pair and analyze cpp

on:
  push:

permissions:
  contents: read

jobs:
  check-and-analyze:
    name: Check md headers and analyze cpp
    runs-on: ubuntu-latest-slim
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Check md headers for changed cpp files
        env:
          BEFORE: ${{ github.event.before }}
          AFTER: ${{ github.event.after }}
        run: |
          set -euo pipefail

          if [ "$BEFORE" = "0000000000000000000000000000000000000000" ]; then
            CHANGED_FILES=$(git diff --name-only --diff-filter=ACMR 4b825dc642cb6eb9a060e54bf8d69288fbee4904 "$AFTER" || true)
          else
            CHANGED_FILES=$(git diff --name-only --diff-filter=ACMR "$BEFORE" "$AFTER" || true)
          fi

          mapfile -t CPP_FILES < <(printf '%s\n' "$CHANGED_FILES" | grep -E '\.cpp$' || true)

          : > /tmp/cpp_files.txt
          for f in "${CPP_FILES[@]}"; do
            [ -n "$f" ] && printf '%s\n' "$f" >> /tmp/cpp_files.txt
          done

          if [ "${#CPP_FILES[@]}" -eq 0 ]; then
            echo "本次 push 没有 .cpp 文件，跳过检查与分析。"
            exit 0
          fi

          echo "本次 push 中的 .cpp 文件："
          printf '  %s\n' "${CPP_FILES[@]}"

          EXIT_CODE=0
          for cpp_file in "${CPP_FILES[@]}"; do
            [ -z "$cpp_file" ] && continue

            dir=$(dirname "$cpp_file")
            base=$(basename "$cpp_file" .cpp)

            if [ "$dir" = "." ]; then
              md_file="${base}.md"
            else
              md_file="${dir}/${base}.md"
            fi

            if [ -f "$md_file" ]; then
              FIRST_LINE=$(head -n 1 "$md_file")

              if [[ "$FIRST_LINE" != "# ${base} "* ]]; then
                echo "::error file=${md_file},line=1::Markdown 第一行格式错误。期望以 '# ${base} ' 开头，实际为: ${FIRST_LINE}"
                EXIT_CODE=1
              else
                echo "✅ ${md_file} 第一行格式正确: ${FIRST_LINE}"
              fi
            else
              echo "⏭️ ${cpp_file} 没有对应的 ${md_file}，跳过 md 标题检查。"
            fi
          done

          exit $EXIT_CODE

      - name: Submit changed cpp files for analysis
        env:
          API_KEY: ${{ secrets.API_KEY }}
        run: |
          set -euo pipefail

          API_BASE="https://oia.vblg.top"

          if [ ! -s /tmp/cpp_files.txt ]; then
            echo "没有需要分析的 .cpp 文件。"
            exit 0
          fi

          while IFS= read -r cpp_file; do
            [ -z "$cpp_file" ] && continue
            echo "提交分析: $cpp_file"

            BASE=$(basename "$cpp_file" .cpp)
            CODE=$(cat "$cpp_file")

            PAYLOAD=$(jq -n \
              --arg problem_id "$BASE" \
              --arg problem "" \
              --arg code "$CODE" \
              --arg notes "" \
              --arg language "cpp17" \
              '{
                problem_id: $problem_id,
                problem: $problem,
                code: $code,
                notes: $notes,
                language: $language
              }')

            HTTP_CODE=$(curl -sS -o /tmp/resp.json -w "%{http_code}" \
              -X POST "${API_BASE}/api/v1/analyze" \
              -H "Authorization: Bearer ${API_KEY}" \
              -H "Content-Type: application/json" \
              -d "$PAYLOAD")

            if [ "$HTTP_CODE" != "202" ]; then
              echo "::error file=${cpp_file}::提交分析失败 (HTTP ${HTTP_CODE})"
              cat /tmp/resp.json || true
              exit 1
            fi

            echo "已提交: $(cat /tmp/resp.json)"
          done < /tmp/cpp_files.txt