package clock

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

	"gitea.stevedudenhoeffer.com/steve/majordomo/llm"
)

func fixed() time.Time {
	return time.Date(2026, 6, 10, 15, 30, 0, 0, time.UTC)
}

func callTool(t *testing.T, name, args string) llm.ToolResult {
	t.Helper()
	sk := New(WithClock(fixed))
	tool, ok := sk.Tools().Get(name)
	if !ok {
		t.Fatalf("tool %q missing", name)
	}
	return llm.ExecuteTool(context.Background(), tool, llm.ToolCall{
		ID: "c1", Name: name, Arguments: json.RawMessage(args),
	})
}

func TestTimeNowUTC(t *testing.T) {
	res := callTool(t, "time_now", `{}`)
	if res.IsError {
		t.Fatalf("result = %+v", res)
	}
	var out map[string]string
	if err := json.Unmarshal([]byte(res.Content), &out); err != nil {
		t.Fatalf("decode: %v", err)
	}
	if out["rfc3339"] != "2026-06-10T15:30:00Z" || out["weekday"] != "Wednesday" {
		t.Errorf("out = %v", out)
	}
}

func TestTimeNowZoned(t *testing.T) {
	res := callTool(t, "time_now", `{"timezone":"America/New_York"}`)
	if res.IsError {
		t.Fatalf("result = %+v", res)
	}
	if !strings.Contains(res.Content, "2026-06-10T11:30:00-04:00") {
		t.Errorf("content = %s", res.Content)
	}
}

func TestTimeNowBadZone(t *testing.T) {
	res := callTool(t, "time_now", `{"timezone":"Mars/Olympus"}`)
	if !res.IsError {
		t.Errorf("result = %+v, want error", res)
	}
}

func TestTimeConvert(t *testing.T) {
	res := callTool(t, "time_convert", `{"time":"2026-06-10T15:30:00Z","timezone":"Europe/Berlin"}`)
	if res.IsError {
		t.Fatalf("result = %+v", res)
	}
	if !strings.Contains(res.Content, "2026-06-10T17:30:00+02:00") {
		t.Errorf("content = %s", res.Content)
	}
}

func TestInstructionsMentionTools(t *testing.T) {
	sk := New()
	if !strings.Contains(sk.Instructions(), "time_now") {
		t.Errorf("instructions = %q", sk.Instructions())
	}
}