package tools

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

	"github.com/crypto/openclaw/internal/llm"
)

// TimeNow returns the current time, optionally in an IANA time zone.
type TimeNow struct{ Now func() time.Time }

func (TimeNow) Spec() llm.ToolSpec {
	return llm.ToolSpec{
		Name:        "time_now",
		Description: "Get the current date and time. Optional IANA time zone, e.g. Europe/Berlin.",
		Parameters:  obj(map[string]any{"timezone": map[string]any{"type": "string"}}),
	}
}

func (t TimeNow) Call(_ context.Context, raw json.RawMessage) (string, error) {
	var a struct{ Timezone string `json:"timezone"` }
	if err := json.Unmarshal(raw, &a); err != nil {
		return "", err
	}
	now := time.Now
	if t.Now != nil {
		now = t.Now
	}
	n := now()
	if a.Timezone != "" {
		loc, err := time.LoadLocation(a.Timezone)
		if err != nil {
			return "", fmt.Errorf("unknown timezone %q", a.Timezone)
		}
		n = n.In(loc)
	}
	return n.Format("2006-01-02T15:04:05 MST (Monday)"), nil
}