package logic

import (
	"testing"

	"img_infinite_canvas/internal/domain/design"
)

func TestLatestLovartThreadIDKeepsCurrentNonEmptyThread(t *testing.T) {
	threads := []design.AgentThreadSummary{
		{AgentThreadID: "thread-current", UpdateTimestamp: 100},
		{AgentThreadID: "thread-latest", UpdateTimestamp: 200},
	}

	if got := latestLovartThreadID("thread-current", threads); got != "thread-current" {
		t.Fatalf("expected current non-empty thread, got %q", got)
	}
}

func TestLatestLovartThreadIDFallsBackToLatestNonEmptyThread(t *testing.T) {
	threads := []design.AgentThreadSummary{
		{AgentThreadID: "thread-older", UpdateTimestamp: 100},
		{AgentThreadID: "thread-latest", UpdateTimestamp: 300},
		{AgentThreadID: "thread-middle", UpdateTimestamp: 200},
	}

	if got := latestLovartThreadID("thread-empty", threads); got != "thread-latest" {
		t.Fatalf("expected latest non-empty thread, got %q", got)
	}
}

func TestLatestLovartThreadIDStaysEmptyWithoutHistory(t *testing.T) {
	if got := latestLovartThreadID("thread-empty", nil); got != "" {
		t.Fatalf("expected empty thread ID, got %q", got)
	}
}