package redisstate

import (
	"testing"
	"time"

	"github.com/alicebob/miniredis/v2"
	"github.com/redis/go-redis/v9"
	"github.com/stretchr/testify/require"
)

func TestKeyspaceBuildsStableKeys(t *testing.T) {
	t.Parallel()

	keyspace := Keyspace{}

	require.Equal(t, "mail:delivery_commands", keyspace.DeliveryCommands())
	require.Equal(t, "mail:stream_offsets:bWFpbDpkZWxpdmVyeV9jb21tYW5kcw", keyspace.StreamOffset("mail:delivery_commands"))
}

func TestStreamOffsetStoreRoundTrip(t *testing.T) {
	t.Parallel()

	server := miniredis.RunT(t)
	client := redis.NewClient(&redis.Options{Addr: server.Addr()})
	t.Cleanup(func() { _ = client.Close() })

	store, err := NewStreamOffsetStore(client)
	require.NoError(t, err)

	stream := "mail:delivery_commands"
	require.NoError(t, store.Save(t.Context(), stream, "1234-5"))

	got, ok, err := store.Load(t.Context(), stream)
	require.NoError(t, err)
	require.True(t, ok)
	require.Equal(t, "1234-5", got)
}

func TestUnmarshalStreamOffsetRequiresUpdatedAt(t *testing.T) {
	t.Parallel()

	payload, err := MarshalStreamOffset(StreamOffset{
		Stream:               "mail:delivery_commands",
		LastProcessedEntryID: "1-0",
		UpdatedAt:            time.Now().UTC(),
	})
	require.NoError(t, err)
	got, err := UnmarshalStreamOffset(payload)
	require.NoError(t, err)
	require.Equal(t, "1-0", got.LastProcessedEntryID)

	_, err = UnmarshalStreamOffset([]byte(`{"stream":"x","last_processed_entry_id":"1"}`))
	require.Error(t, err)
}