package domain

import (
	"errors"
	"testing"
)

func contextWatch() *RadarWatch {
	return &RadarWatch{ID: "w", OwnerUID: 7, Terms: []string{"找水電"}, Status: WatchActive, UpdatedAt: 10}
}

func TestWatchContextLegacyAndPairInvariant(t *testing.T) {
	w := contextWatch()
	if err := w.Normalize(); err != nil {
		t.Fatal(err)
	}
	if w.ContextMode != WatchContextGeneric {
		t.Fatalf("legacy mode=%q", w.ContextMode)
	}
	w.BrandID = "brand-only"
	if err := w.NormalizeContext(); !errors.Is(err, ErrValidation) {
		t.Fatalf("expected paired ID validation, got %v", err)
	}
}

func TestWatchProductBindingIsOneWay(t *testing.T) {
	w := contextWatch()
	if err := w.Normalize(); err != nil {
		t.Fatal(err)
	}
	if err := w.BindProduct("b1", "p1", "Brand", "Product", 20); err != nil {
		t.Fatal(err)
	}
	if err := w.BindProduct("b2", "p2", "Other", "Other", 30); !errors.Is(err, ErrValidation) {
		t.Fatalf("expected conflict, got %v", err)
	}
	w.Status, w.PauseReason = WatchPaused, PauseReasonProductUnavailable
	if err := w.Transition(WatchActive); !errors.Is(err, ErrValidation) {
		t.Fatalf("expected unavailable resume guard, got %v", err)
	}
}