# .gitea/workflows/sync-wiki.yml
name: Sync solutions to Wiki

on:
  push:
    branches: [main]
    paths:
      - "solutions/**"
      - ".gitea/workflows/sync-wiki.yml"
  workflow_dispatch:

permissions:
  contents: write

concurrency:
  group: wiki-sync
  cancel-in-progress: false

jobs:
  sync:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Clone wiki repo
        env:
          WIKI_TOKEN: ${{ secrets.WIKI_TOKEN }}
          SERVER_URL: ${{ github.server_url }}
        run: |
          set -euo pipefail
          HOST="${SERVER_URL#https://}"
          HOST="${HOST#http://}"
          if ! git clone \
            "https://oauth2:${WIKI_TOKEN}@${HOST}/${{ github.repository }}.wiki.git" \
            wiki; then
            echo "::error::Clone wiki failed. 检查: 1) wiki 是否已初始化 2) ENABLE_LOCAL_WIKI 是否开启 3) WIKI_TOKEN 是否有 write:repository 权限"
            exit 1
          fi

      - name: Copy markdown files
        shell: bash
        run: |
          set -euo pipefail
          [ -d solutions ] || { echo "solutions/ not found"; exit 1; }

          cd solutions
          while IFS= read -r -d '' f; do
            rel="${f#./}"
            base="$(basename "$rel")"

            # 不覆盖 wiki 的保留页面
            case "$base" in
              _Sidebar.md|_Footer.md|_Header.md) continue ;;
            esac

            # wiki 不支持子目录，把 a/b.md 展平为 a-b.md
            target="../wiki/$(printf '%s' "$rel" | sed 's#/#-#g')"
            cp "$f" "$target"
          done < <(find . -type f -name '*.md' -print0)

          cd ..
          echo "---- wiki 目录内容 ----"
          ls -la wiki

      - name: Generate sidebar
        shell: bash
        run: |
          set -euo pipefail
          [ -d solutions ] || { echo "solutions/ not found"; exit 1; }
          [ -d wiki ]      || { echo "wiki/ not found";      exit 1; }

          out=wiki/_Sidebar.md

          # 收集 solutions 下所有 md（相对路径，去掉扩展名），按路径排序
          mapfile -t items < <(
            find solutions -type f -name '*.md' -printf '%P\n' \
              | sed 's/\.md$//' \
              | sort
          )

          {
            echo "## 题解"
            echo ""
            echo "[🏠 返回仓库](${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY})"
            echo ""

            if [ "${#items[@]}" -eq 0 ]; then
              echo "_暂无题解_"
            else
              current="__NONE__"
              for rel in "${items[@]}"; do
                base="$(basename "$rel")"
                # 跳过 wiki 保留页面
                case "$base" in
                  _Sidebar|_Footer|_Header) continue ;;
                esac

                dir="$(dirname "$rel")"
                [[ "$dir" == "." ]] && dir=""

                # 目录切换时输出分组标题
                if [[ "$dir" != "$current" ]]; then
                  echo ""
                  if [[ -n "$dir" ]]; then
                    echo "### ${dir}"
                  else
                    echo "### 根目录"
                  fi
                  echo ""
                  current="$dir"
                fi

                # 与 Copy 步骤一致的展平规则：a/b -> a-b
                flat="$(printf '%s' "$rel" | tr '/' '-')"

                # Gitea wiki 链接语法：[[页面名|显示文本]]
                echo "- [[${flat}|${base}]]"
              done
            fi
          } > "$out"

          echo "---- _Sidebar.md ----"
          cat "$out"

      - name: Commit & push
        shell: bash
        run: |
          cd wiki
          git config user.name  "gitea-actions[bot]"
          git config user.email "gitea-actions[bot]@noreply.${{ github.server_url }}"

          git add -A
          if git diff --cached --quiet; then
            echo "No changes to sync."
            exit 0
          fi

          git commit -m "Sync solutions from ${GITHUB_REPOSITORY}@${GITHUB_SHA:0:7}"
          git push