package engine

import (
	"sync/atomic"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"github.com/thrasher-corp/gocryptotrader/currency"
	exchange "github.com/thrasher-corp/gocryptotrader/exchanges"
	"github.com/thrasher-corp/gocryptotrader/exchanges/asset"
	"github.com/thrasher-corp/gocryptotrader/exchanges/orderbook"
	"github.com/thrasher-corp/gocryptotrader/exchanges/ticker"
)

func TestSetupEventManager(t *testing.T) {
	t.Parallel()
	_, err := setupEventManager(nil, nil, 0, false)
	assert.ErrorIs(t, err, errNilComManager)

	_, err = setupEventManager(&CommunicationManager{}, nil, 0, false)
	assert.ErrorIs(t, err, errNilExchangeManager)

	m, err := setupEventManager(&CommunicationManager{}, &ExchangeManager{}, 0, false)
	require.NoError(t, err)

	if m == nil { //nolint:staticcheck,nolintlint // SA5011 Ignore the nil warnings
		t.Fatal("expected manager")
	}
	if m.sleepDelay == 0 { //nolint:staticcheck,nolintlint // SA5011 Ignore the nil warnings
		t.Error("expected default set")
	}
}

func TestEventManagerStart(t *testing.T) {
	m, err := setupEventManager(&CommunicationManager{}, &ExchangeManager{}, 0, false)
	assert.NoError(t, err)

	err = m.Start()
	assert.NoError(t, err)

	err = m.Start()
	assert.ErrorIs(t, err, ErrSubSystemAlreadyStarted)

	m = nil
	err = m.Start()
	assert.ErrorIs(t, err, ErrNilSubsystem)
}

func TestEventManagerIsRunning(t *testing.T) {
	t.Parallel()
	m, err := setupEventManager(&CommunicationManager{}, &ExchangeManager{}, 0, false)
	assert.NoError(t, err)

	err = m.Start()
	assert.NoError(t, err)

	if !m.IsRunning() {
		t.Error("expected true")
	}
	atomic.StoreInt32(&m.started, 0)
	if m.IsRunning() {
		t.Error("expected false")
	}
	m = nil
	if m.IsRunning() {
		t.Error("expected false")
	}
}

func TestEventManagerStop(t *testing.T) {
	t.Parallel()
	m, err := setupEventManager(&CommunicationManager{}, &ExchangeManager{}, 0, false)
	assert.NoError(t, err)

	err = m.Start()
	assert.NoError(t, err)

	err = m.Stop()
	assert.NoError(t, err)

	err = m.Stop()
	assert.ErrorIs(t, err, ErrSubSystemNotStarted)

	m = nil
	err = m.Stop()
	assert.ErrorIs(t, err, ErrNilSubsystem)
}

func TestEventManagerAdd(t *testing.T) {
	t.Parallel()
	em := NewExchangeManager()
	m, err := setupEventManager(&CommunicationManager{}, em, 0, false)
	assert.NoError(t, err)

	_, err = m.Add("", "", EventConditionParams{}, currency.NewPair(currency.BTC, currency.USDC), asset.Spot, "")
	assert.ErrorIs(t, err, ErrSubSystemNotStarted)

	err = m.Start()
	assert.NoError(t, err)

	_, err = m.Add("", "", EventConditionParams{}, currency.NewPair(currency.BTC, currency.USDC), asset.Spot, "")
	assert.ErrorIs(t, err, errExchangeDisabled)

	exch, err := em.NewExchangeByName(testExchange)
	if err != nil {
		t.Fatal(err)
	}
	exch.SetDefaults()
	err = em.Add(exch)
	require.NoError(t, err)

	_, err = m.Add(testExchange, "", EventConditionParams{}, currency.NewPair(currency.BTC, currency.USDC), asset.Spot, "")
	assert.ErrorIs(t, err, errInvalidItem)

	cond := EventConditionParams{
		Condition:       ConditionGreaterThan,
		Price:           1337,
		OrderbookAmount: 1337,
	}
	_, err = m.Add(testExchange, ItemPrice, cond, currency.NewPair(currency.BTC, currency.USDC), asset.Spot, "")
	assert.ErrorIs(t, err, errInvalidAction)

	_, err = m.Add(testExchange, ItemPrice, cond, currency.NewPair(currency.BTC, currency.USDC), asset.Spot, ActionTest)
	assert.NoError(t, err)

	action := ActionSMSNotify + "," + ActionTest
	_, err = m.Add(testExchange, ItemPrice, cond, currency.NewPair(currency.BTC, currency.USDC), asset.Spot, action)
	assert.NoError(t, err)
}

func TestEventManagerRemove(t *testing.T) {
	t.Parallel()
	em := NewExchangeManager()
	m, err := setupEventManager(&CommunicationManager{}, em, 0, false)
	assert.NoError(t, err)

	if m.Remove(0) {
		t.Error("expected false")
	}
	err = m.Start()
	assert.NoError(t, err)

	if m.Remove(0) {
		t.Error("expected false")
	}
	action := ActionSMSNotify + "," + ActionTest
	cond := EventConditionParams{
		Condition:       ConditionGreaterThan,
		Price:           1337,
		OrderbookAmount: 1337,
	}
	exch, err := em.NewExchangeByName(testExchange)
	if err != nil {
		t.Fatal(err)
	}
	exch.SetDefaults()
	err = em.Add(exch)
	require.NoError(t, err)

	id, err := m.Add(testExchange, ItemPrice, cond, currency.NewPair(currency.BTC, currency.USDC), asset.Spot, action)
	assert.NoError(t, err)

	if !m.Remove(id) {
		t.Error("expected true")
	}
}

func TestGetEventCounter(t *testing.T) {
	t.Parallel()
	em := NewExchangeManager()
	m, err := setupEventManager(&CommunicationManager{}, em, 0, false)
	assert.NoError(t, err)

	total, executed := m.getEventCounter()
	if total != 0 && executed != 0 {
		t.Error("expected 0")
	}
	err = m.Start()
	assert.NoError(t, err)

	total, executed = m.getEventCounter()
	if total != 0 && executed != 0 {
		t.Error("expected 0")
	}
	action := ActionSMSNotify + "," + ActionTest
	cond := EventConditionParams{
		Condition:       ConditionGreaterThan,
		Price:           1337,
		OrderbookAmount: 1337,
	}
	exch, err := em.NewExchangeByName(testExchange)
	if err != nil {
		t.Fatal(err)
	}
	exch.SetDefaults()
	err = em.Add(exch)
	require.NoError(t, err)

	_, err = m.Add(testExchange, ItemPrice, cond, currency.NewPair(currency.BTC, currency.USDC), asset.Spot, action)
	assert.NoError(t, err)

	total, _ = m.getEventCounter()
	if total == 0 {
		t.Error("expected 1")
	}
}

func TestCheckEventCondition(t *testing.T) {
	em := NewExchangeManager()
	m, err := setupEventManager(&CommunicationManager{}, em, 0, false)
	require.NoError(t, err, "setupEventManager must not error")

	m.m.Lock()
	err = m.checkEventCondition(nil)
	assert.ErrorIs(t, err, ErrSubSystemNotStarted)
	m.m.Unlock()

	require.NoError(t, m.Start(), "Start must not error")

	m.m.Lock()
	err = m.checkEventCondition(nil)
	assert.ErrorIs(t, err, errNilEvent)
	m.m.Unlock()

	action := ActionSMSNotify + "," + ActionTest
	cond := EventConditionParams{
		Condition:       ConditionGreaterThan,
		Price:           1337,
		OrderbookAmount: 1337,
	}
	exch, err := em.NewExchangeByName(testExchange)
	require.NoError(t, err, "NewExchangeByName must not error")

	conf, err := exchange.GetDefaultConfig(t.Context(), exch)
	require.NoError(t, err, "GetDefaultConfig must not error")

	require.NoError(t, exch.Setup(conf), "Setup must not error")

	err = em.Add(exch)
	require.NoError(t, err, "ExchangeManager Add must not error")

	_, err = m.Add(testExchange, ItemPrice, cond, currency.NewBTCUSD(), asset.Spot, action)
	require.NoError(t, err, "eventManager Add must not error")

	m.m.Lock()
	err = m.checkEventCondition(&m.events[0])
	assert.ErrorIs(t, err, ticker.ErrTickerNotFound)
	m.m.Unlock()

	_, err = exch.UpdateTicker(t.Context(), currency.NewBTCUSD(), asset.Spot)
	require.NoError(t, err, "UpdateTicker must not error")

	m.m.Lock()
	err = m.checkEventCondition(&m.events[0])
	require.NoError(t, err, "checkEventCondition must not error")
	m.m.Unlock()

	m.events[0].Item = ItemOrderbook
	m.events[0].Executed = false
	m.events[0].Condition.CheckAsks = true
	m.events[0].Condition.CheckBids = true

	m.m.Lock()
	err = m.checkEventCondition(&m.events[0])
	assert.ErrorIs(t, err, orderbook.ErrOrderbookNotFound)
	m.m.Unlock()

	_, err = exch.UpdateOrderbook(t.Context(), currency.NewBTCUSD(), asset.Spot)
	require.NoError(t, err, "UpdateOrderbook must not error")

	m.m.Lock()
	err = m.checkEventCondition(&m.events[0])
	assert.NoError(t, err, "checkEventCondition should not error")
	m.m.Unlock()
}