package store

import (
	"context"
	"errors"
	"reflect"
	"testing"
	"time"
)

func TestOutboxSQLPreservesReplayableOrderedReadAndPublishAck(t *testing.T) {
	for query, fragments := range map[string][]string{
		OutboxUnpublishedSelectSQL:         {"published_at IS NULL", "ORDER BY created_at, event_id", "LIMIT $1"},
		OutboxUnpublishedProposalSelectSQL: {"published_at IS NULL", "event_type = 'proposal_changed'", "ORDER BY created_at, event_id", "LIMIT $1"},
		OutboxMarkPublishedSQL:             {"published_at = $2", "event_id = $1", "published_at IS NULL"},
	} {
		for _, fragment := range fragments {
			if !contains(query, fragment) {
				t.Fatalf("query %q missing %q", query, fragment)
			}
		}
	}
}

func TestOutboxDispatcherAcknowledgesOnlyAfterDelivery(t *testing.T) {
	events := []OutboxEvent{{EventID: "event-1"}, {EventID: "event-2"}}
	var delivered, acknowledged []string
	dispatcher := &OutboxDispatcher{
		Read: func(context.Context, int) ([]OutboxEvent, error) { return events, nil },
		Deliver: func(_ context.Context, event OutboxEvent) error {
			delivered = append(delivered, event.EventID)
			if event.EventID == "event-2" {
				return errors.New("transient fan-out failure")
			}
			return nil
		},
		Ack: func(_ context.Context, eventID string, _ time.Time) error {
			acknowledged = append(acknowledged, eventID)
			return nil
		},
	}
	count, err := dispatcher.Dispatch(context.Background(), 10, time.Unix(1000, 0))
	if err == nil || count != 1 {
		t.Fatalf("dispatch = (%d, %v), want one acknowledged event and an error", count, err)
	}
	if !reflect.DeepEqual(delivered, []string{"event-1", "event-2"}) || !reflect.DeepEqual(acknowledged, []string{"event-1"}) {
		t.Fatalf("delivery/ack order = %v/%v", delivered, acknowledged)
	}
}

func TestOutboxDispatcherRejectsInvalidConfiguration(t *testing.T) {
	if count, err := (*OutboxDispatcher)(nil).Dispatch(context.Background(), 1, time.Unix(1000, 0)); err == nil || count != 0 {
		t.Fatal("nil dispatcher accepted")
	}
}

func TestOutboxAdaptersRejectUnsafeArgumentsWithoutDatabase(t *testing.T) {
	if _, err := ReadUnpublishedOutbox(nil, nil, 1); err == nil {
		t.Fatal("nil database accepted")
	}
	if _, err := ReadUnpublishedOutbox(nil, nil, 1001); err == nil {
		t.Fatal("unbounded outbox batch accepted")
	}
	if err := MarkOutboxPublished(nil, nil, "event-1", time.Unix(1000, 0)); err == nil {
		t.Fatal("nil database acknowledgement accepted")
	}
	if err := MarkOutboxPublished(nil, nil, "", time.Unix(1000, 0)); err == nil {
		t.Fatal("empty event acknowledgement accepted")
	}
}