// Package tools —— 网络搜索工具：桥接 Agent-Native 的 TavilyProvider
// （密钥池轮换由其实现）到统一注册表。配置了 tools.tavily.apiKeys 才注册
// （对齐 agent-native 语义：未配置不静默降级为空结果）。
package tools

import (
	"context"
	"encoding/json"
	"fmt"
	"strings"

	agenttools "git-ssh.u1680832.nyat.app/weichen/Agent-Native.git/runtime/tools"
	core "git-ssh.u1680832.nyat.app/weichen/Agent-System-Core.git"
)

// TavilySettings 装配期读取的搜索配置。
type TavilySettings struct {
	Endpoint string
	APIKeys  []string
}

// RegisterSearchTools 注册 tavily_search（完整参数面）与 web_search（别名）。
// 工具面与 agent-native runtime/tools/search.go 逐字段对齐（名称/参数/输出/失败降级文案）。
func RegisterSearchTools(r *Registry, provider agenttools.SearchProvider) error {
	return registerSearch(r, func(ToolExecCtx) agenttools.SearchProvider { return provider })
}

// RegisterLazySearchTools 注册按调用时取密钥的搜索工具：provider 在每次调用时
// 重建（设置页/svc 播种改了 tavily 密钥即刻生效，不再需要重启进程——
// 实测播种后 tavily 工具要重启才注册）。configure 返回 nil 时不静默降级，
// 返回明确的未配置提示。
func RegisterLazySearchTools(r *Registry, configure func() agenttools.SearchProvider) error {
	return registerSearch(r, func(ToolExecCtx) agenttools.SearchProvider { return configure() })
}

func registerSearch(r *Registry, providerFor func(ToolExecCtx) agenttools.SearchProvider) error {
	tavily := func(rc ToolExecCtx, args json.RawMessage) (string, error) {
		provider := providerFor(rc)
		if provider == nil {
			return "", fmt.Errorf("搜索未配置：settings.tools.tavily.apiKeys（或对应 secret）为空；配置后立即生效，无需重启")
		}
		return execSearch(provider, args)
	}
	if err := r.Register(core.ToolDesc{
		Name:        "tavily_search",
		Description: "Search the live internet for real-time information, competitor intelligence, regulatory news, product specs, or market data via Tavily (with automatic API key pool rotation).",
		Source:      core.SourceBuiltin,
		Parameters: json.RawMessage(`{
  "type": "object",
  "properties": {
    "query": {"type": "string", "description": "The search query keywords in Chinese or English"},
    "search_depth": {"type": "string", "enum": ["basic", "advanced"], "description": "Search depth: 'basic' (fast summary) or 'advanced' (deep analysis, default 'basic')"},
    "max_results": {"type": "number", "description": "Maximum number of search results to retrieve (1 to 10, default 5)"}
  },
  "required": ["query"]
}`),
	}, tavily); err != nil {
		return err
	}
	return r.Register(core.ToolDesc{
		Name:        "web_search",
		Description: "Alias for tavily_search. Searches the live internet for information.",
		Source:      core.SourceBuiltin,
		Parameters: json.RawMessage(`{
  "type": "object",
  "properties": {"query": {"type": "string", "description": "The search query keywords"}},
  "required": ["query"]
}`),
	}, tavily)
}

func execSearch(provider agenttools.SearchProvider, args json.RawMessage) (string, error) {
	var params struct {
		Query       string  `json:"query"`
		SearchDepth string  `json:"search_depth"`
		MaxResults  float64 `json:"max_results"`
	}
	if err := json.Unmarshal(args, &params); err != nil {
		return "", err
	}
	query := strings.TrimSpace(params.Query)
	if query == "" {
		return "", fmt.Errorf("Error: query cannot be empty.")
	}
	resp, err := provider.Search(context.Background(), agenttools.SearchRequest{
		Query:      query,
		Depth:      params.SearchDepth,
		MaxResults: int(params.MaxResults),
	})
	if err != nil {
		// 失败对模型可见并指引回退（与 agent-native 扩展降级文案一致）；
		// 注册表把 err.Error() 作为输出回灌，故降级文案承载在 error 内。
		return "", fmt.Errorf("[Tavily Search Failed]: %v\n(Agent should rely on workspace materials or local knowledge base as fallback.)", err)
	}
	return formatSearchResults(resp, query), nil
}

// formatSearchResults 输出 Markdown（对齐 agent-native 的呈现形态：答案 + 编号结果）。
func formatSearchResults(resp agenttools.SearchResponse, query string) string {
	var sb strings.Builder
	fmt.Fprintf(&sb, "## 🌐 Tavily 实时网络搜索结果: %q\n\n", query)
	if strings.TrimSpace(resp.Answer) != "" {
		fmt.Fprintf(&sb, "**概要**：%s\n\n", resp.Answer)
	}
	if len(resp.Results) == 0 {
		sb.WriteString("（无命中结果）\n")
		return sb.String()
	}
	for i, r := range resp.Results {
		fmt.Fprintf(&sb, "%d. %s\n   %s\n\n", i+1, r.Title, strings.TrimSpace(r.Content))
	}
	return sb.String()
}