package state

import (
	"fmt"
	"testing"
	"time"

	"gitlab.com/whom/bingobot/internal/logging"
)

/* WARNING:
 * Cannot run these tests in parallel!
 * limitation of SetupTest and CleanupTest
 */

const TestTok = "TEST_NAME"
var loggingInitialized = false

func SetupTest(t *testing.T) {
	// have to set up logger
	if !loggingInitialized {
		logging.Init()
		loggingInitialized = true
	}

	old, _ := time.Parse(
		time.RFC3339,
		VeryOldVote,
	)

	for i := range 270 {
		if err := PublishEvent(UserActiveEvent{UserEvent{
			uid:     fmt.Sprintf("%d", i),
			created: old,
		}}); err != nil {
			t.Errorf("Failed to add event: %e", err)
		}
	}

	PublishEvent(UserActiveEvent{UserEvent{
		uid:     fmt.Sprintf(TestTok),
		created: time.Now(),
	}})

	PublishEvent(ChallengeEvent{UserEvent{
		uid:     fmt.Sprintf(TestTok),
		created: time.Now(),
	}})

	if len(eventCache) != 272 {
		t.Errorf("Unexpected number of events in cache: %d",
			len(eventCache))
	}
}

func CleanupTest() {
	eventSubscriptionCache = [NumEventTypes][]chan Event{}
	eventCache = []Event{}
}

func TestPubSub(t *testing.T) {
	SetupTest(t)

	c, e := UserActive.SubscribeWithHistory()
	if e != nil {
		t.Errorf("Error subscribing to UserActive events: %e", e)
	}

Loop:
	for i := 0; true; i++ {
		select {
		case e, ok := <-c:
			if !ok {
				t.Errorf("Subscription Channel Closed")
			}
			if e.Type() != UserActive {
				t.Errorf("Non UserActive Event in UserActive subscription: %v", e.Type())
			}
		default:
			if i == eventChannelBufferSize {
				break Loop
			} else {
				t.Errorf("Unexpected number of events in channel: %d", i)
			}
		}
	}

	PublishEvent(UserActiveEvent{UserEvent{
		uid:     "uniqueToken",
		created: time.Now(),
	}})

	select {
	case e, ok := <-c:
		if !ok || e.Data()[UserEventUserKey] != "uniqueToken" {
			t.Errorf("didnt read correct event from channel: %v", e)
		}
	default:
		t.Errorf("New event not published to subscription!")
	}

	CleanupTest()
}

func TestFilterCache(t *testing.T) {
	SetupTest(t)

	events, err := GetMatchingEvents(
		UserActive,
		map[string]string{
			UserEventUserKey: TestTok,
		},
	)

	if err != nil {
		t.Errorf("Error filtering events: %e", err)
	}

	if len(events) != 1 {
		t.Errorf("Got too many events from filter: %d", len(events))
	}

	if events[0].Type() != UserActive {
		t.Errorf("Got wrong event!: %+v", events[0])
	}

	CleanupTest()
}

func TestPruneCache(t *testing.T) {
	SetupTest(t)
	pruneEventCache()

	if len(eventCache) != 2 {
		t.Errorf("Incorrect number of remaining events: %d", len(eventCache))
	}

	CleanupTest()
}

func TestVoteEventValidations(t *testing.T) {
	var err error

	if err = VoteEvent(
		map[string]string{
			VoteRequesterKey: "r",
			VoteCreatedKey:   "c",
			VoteStatusKey:    VoteStatusInProgress,
		},
	).Validate(); err.Error() != VoteMissingKeyError+VoteActionKey {
		t.Errorf("Unexpected error from validation: %e", err)
	}

	if err = VoteEvent(
		map[string]string{
			VoteActionKey:    "a",
			VoteRequesterKey: "r",
			VoteCreatedKey:   "c",
			VoteStatusKey:    VoteStatusInProgress,
		},
	).Validate(); err != nil {
		t.Errorf("Unexpected error: %e", err)
	}

	if err = VoteEvent(
		map[string]string{
			VoteActionKey:    "a",
			VoteRequesterKey: "r",
			VoteCreatedKey:   "c",
			VoteStatusKey:    "s",
		},
	).Validate(); err.Error() != VoteBadStatusError+"s" {
		t.Errorf("Unexpected or no error: %e", err)
	}

	if err = VoteEvent(
		map[string]string{
			VoteActionKey:    "a",
			VoteRequesterKey: "r",
			VoteCreatedKey:   "c",
			VoteStatusKey:    VoteStatusInProgress,
			VoteResultKey:    VoteResultFail,
		},
	).Validate(); err.Error() != VoteNotFinishedError {
		t.Errorf("Unexpected or no error: %e", err)
	}

	if err = VoteEvent(
		map[string]string{
			VoteActionKey:    "a",
			VoteRequesterKey: "r",
			VoteCreatedKey:   "c",
			VoteStatusKey:    VoteStatusFinalized,
		},
	).Validate(); err.Error() != VoteMissingResultError {
		t.Errorf("Unexpected or no error: %e", err)
	}

	if err = VoteEvent(
		map[string]string{
			VoteActionKey:    "a",
			VoteRequesterKey: "r",
			VoteCreatedKey:   "c",
			VoteStatusKey:    VoteStatusFinalized,
			VoteResultKey:    "r",
		},
	).Validate(); err.Error() != VoteBadResultError+"r" {
		t.Errorf("Unexpected or no error: %e", err)
	}

	if err = VoteEvent(
		map[string]string{
			VoteActionKey:    "a",
			VoteRequesterKey: "r",
			VoteCreatedKey:   "c",
			VoteStatusKey:    VoteStatusFinalized,
			VoteResultKey:    VoteResultFail,
		},
	).Validate(); err != nil {
		t.Errorf("Unexpected or no error: %e", err)
	}
}