# ════════════════════════════════════════════════════════════════
# tools/web_search.py
# ════════════════════════════════════════════════════════════════
"""网络搜索工具（从配置读取 max_results / engine / api_key）"""

import time
from tools.base_tool import BaseTool, ToolResult
from config.settings import settings

_MOCK_RESULTS: dict[str, list[dict]] = {
    "天气":  [{"title": "今日天气预报",    "snippet": "晴转多云，气温 15°C ~ 24°C，东南风 3 级"},
              {"title": "未来 7 天天气",   "snippet": "本周整体晴好，周末有小雨"}],
    "python":[{"title": "Python 官方文档", "snippet": "Python 3.12 新特性：改进的错误提示"},
              {"title": "Python 教程",     "snippet": "从零开始学 Python，包含 300+ 实战案例"}],
}
_DEFAULT_RESULTS = [
    {"title": "搜索结果 1", "snippet": "找到相关内容，请查看详情"},
    {"title": "搜索结果 2", "snippet": "更多相关信息可通过链接访问"},
]


class WebSearchTool(BaseTool):
    name        = "web_search"
    description = "在互联网上搜索信息，返回相关网页摘要"
    parameters  = {
        "query":       {"type": "string",  "description": "搜索关键词"},
        "max_results": {"type": "integer", "description": "返回结果数量"},
    }

    def __init__(self):
        super().__init__()
        cfg = settings.tools.web_search
        self._default_max = cfg.max_results
        self._engine      = cfg.engine
        self._api_key     = cfg.api_key
        self._timeout     = cfg.timeout
        self.logger.debug(
            f"⚙️  WebSearch engine={self._engine}, "
            f"max_results={self._default_max}, "
            f"api_key={'***' if self._api_key else '(未设置)'}"
        )

    def execute(self, query: str, max_results: int | None = None, **_) -> ToolResult:
        max_results = max_results or self._default_max
        time.sleep(0.1)

        if self._engine != "mock" and self._api_key:
            # 生产环境：调用真实搜索 API
            # results = self._call_real_api(query, max_results)
            pass

        results = _DEFAULT_RESULTS
        for kw, data in _MOCK_RESULTS.items():
            if kw in query:
                results = data
                break
        results = results[:max_results]
        formatted = "\n".join(
            f"[{i+1}] {r['title']}\n    {r['snippet']}"
            for i, r in enumerate(results)
        )
        return ToolResult(
            success=True,
            output=f"搜索「{query}」({self._engine})，共 {len(results)} 条:\n{formatted}",
            metadata={"query": query, "engine": self._engine, "count": len(results)},
        )