package tools

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

	"agent-native/runtime/codeorch"
)

// RegisterCodeTool 注册 run_tool_script。调用方在开关打开时才注册。
func RegisterCodeTool(reg *Registry) {
	if reg == nil {
		return
	}
	reg.Register(&codeScriptTool{reg: reg})
}

type codeScriptTool struct{ reg *Registry }

func (t *codeScriptTool) Name() string { return "run_tool_script" }
func (t *codeScriptTool) Description() string {
	return "用一段 Python 依次调用已有工具。禁止再调用解释器、本工具、派发和工作流。失败时会列出已经执行的调用"
}
func (t *codeScriptTool) Parameters() json.RawMessage {
	return json.RawMessage(`{"type":"object","properties":{"script":{"type":"string"},"timeout_sec":{"type":"integer"}},"required":["script"]}`)
}
func (t *codeScriptTool) Execute(ctx context.Context, args json.RawMessage) (Result, error) {
	var req struct {
		Script  string `json:"script"`
		Timeout int    `json:"timeout_sec"`
	}
	if err := json.Unmarshal(args, &req); err != nil {
		return Result{Content: err.Error(), IsError: true}, nil
	}
	if strings.TrimSpace(req.Script) == "" {
		return Result{Content: "script 不能为空", IsError: true}, nil
	}
	lim := codeorch.Limits{FullDir: t.reg.Root()}
	if req.Timeout > 0 {
		lim.Timeout = time.Duration(req.Timeout) * time.Second
	}
	out := codeorch.Run(ctx, t.reg.Root(), req.Script, lim, nil, func(ctx context.Context, call codeorch.Call) (string, error) {
		if call.Op != "tool.call" {
			return "", fmt.Errorf("不能调用 %s", call.Op)
		}
		if codeorch.Forbidden(call.Name) {
			return "", fmt.Errorf("不能调用 %s", call.Name)
		}
		res := t.reg.Execute(ctx, call.Name, call.Args)
		if res.IsError {
			return "", fmt.Errorf("%s", res.Content)
		}
		return res.Content, nil
	})
	return Result{Content: out.ModelText(), IsError: out.Err != nil}, nil
}