package fav_test

import (
	"context"
	"errors"
	"testing"

	"chat-agent-system/internal/app/fav"
	"chat-agent-system/internal/events"
)

func TestFavSubscriberDefaultsDisabled(t *testing.T) {
	if fav.DefaultEnabled() {
		t.Fatal("fav subscriber DefaultEnabled must be false")
	}
	c := &fav.EventConsumer{}
	if c.Enabled {
		t.Fatal("zero-value EventConsumer.Enabled must be false")
	}
	err := c.HandleLease(context.Background(), events.Lease{}, nil)
	if !errors.Is(err, events.ErrDisabledConsumer) {
		t.Fatalf("disabled HandleLease: %v", err)
	}
}

func TestFavSubscriberStillDisabledWhenFlagOnWithoutRegistryApproval(t *testing.T) {
	c := &fav.EventConsumer{Enabled: true, Env: "dev"}
	err := c.HandleLease(context.Background(), events.Lease{Environment: "dev"}, nil)
	if !errors.Is(err, events.ErrDisabledConsumer) {
		t.Fatalf("enabled stub must still refuse until cutover approved: %v", err)
	}
	if err := events.NewRegistry().Register(events.ConsumerFAV); err == nil {
		t.Fatal("Registry.Register(fav) must remain fail-closed")
	}
}

func TestFavSubscriberShadowComputesIntendedOutcomeWithoutWrites(t *testing.T) {
	t.Setenv("FAV_DEGRADED_READ", "false")
	t.Setenv("FAV_PUBLISHER_ENABLED", "false")
	c := &fav.EventConsumer{Enabled: false, Env: "dev"}
	out, err := c.ObserveShadow(events.Lease{
		EventName: "document.finalized", AggregateType: "document", AggregateID: "doc_1",
	})
	if err != nil {
		t.Fatal(err)
	}
	if out.WouldStage || out.WouldPublish || out.DegradedReadUsed {
		t.Fatalf("shadow must not claim writes: %+v", out)
	}
	if out.LogicalResource != "document:doc_1" {
		t.Fatalf("logical=%s", out.LogicalResource)
	}
	err = c.HandleLease(context.Background(), events.Lease{}, nil)
	if !errors.Is(err, events.ErrDisabledConsumer) {
		t.Fatalf("HandleLease still disabled: %v", err)
	}

	c.AllowDegradedRead = true
	if _, err := c.ObserveShadow(events.Lease{}); err == nil {
		t.Fatal("shadow must refuse degraded read")
	}

	c.AllowDegradedRead = false
	t.Setenv("FAV_DEGRADED_READ", "true")
	if _, err := c.ObserveShadow(events.Lease{AggregateType: "document", AggregateID: "doc_2"}); err == nil {
		t.Fatal("shadow must refuse process env FAV_DEGRADED_READ")
	}
}