package tools

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

	"ollie/toolsrv"
)

// ToolList lists all available tools from the global registry.
func ToolList(ctx context.Context, srv *toolsrv.Server, args json.RawMessage) (string, error) {
	reg := srv.ToolRegistry()
	if reg == nil {
		return "", fmt.Errorf("tool_list: no registry available")
	}
	summaries := reg.Summaries()
	if len(summaries) == 0 {
		return "(no tools found)", nil
	}
	var out strings.Builder
	for _, s := range summaries {
		out.WriteString(s.Name)
		if s.Description != "" {
			out.WriteString(" — ")
			out.WriteString(s.Description)
		}
		out.WriteString("\n")
	}
	return strings.TrimRight(out.String(), "\n"), nil
}