package main

import (
	"io"
	"log"
	"os"
	"sync"
	"testing"

	"git.sr.ht/~michalr/go-satel"
	"github.com/stretchr/testify/assert"
)

func TestSatelEventTypeFiltering(t *testing.T) {
	tested := MakeFilterByTypeOrIndex([]SatelChangeType{{satel.ArmedPartition}, {satel.PartitionFireAlarm}},
		[]int{})
	mock := &GenericSyncMockFilter[satel.Event]{}

	tested.Then(mock)

	tested.Call(makeTestSatelEvent(satel.ArmedPartition, 1, true))
	tested.Call(makeTestSatelEvent(satel.DoorOpened, 2, true))
	tested.Call(makeTestSatelEvent(satel.PartitionAlarm, 3, true))
	tested.Call(makeTestSatelEvent(satel.PartitionFireAlarm, 4, true))
	tested.Call(makeTestSatelEvent(satel.TroublePart1, 5, true))
	tested.Call(makeTestSatelEvent(satel.ZoneTamper, 6, true))

	assert.Len(t, mock.collected, 2)
	assert.Contains(t, mock.collected, makeTestSatelEvent(satel.ArmedPartition, 1, true))
	assert.Contains(t, mock.collected, makeTestSatelEvent(satel.PartitionFireAlarm, 4, true))
}

func TestSatelEventTypeFiltering_NoAllowedEventTypesMeansAllAreAllowed(t *testing.T) {
	tested := MakeFilterByTypeOrIndex([]SatelChangeType{},
		[]int{})
	mock := &GenericSyncMockFilter[satel.Event]{}

	tested.Then(mock)

	for index, ct := range SUPPORTED_CHANGE_TYPES {
		tested.Call(makeTestSatelEvent(ct, index, true))
	}

	assert.Len(t, mock.collected, len(SUPPORTED_CHANGE_TYPES))
	for index, ct := range SUPPORTED_CHANGE_TYPES {
		assert.Contains(t, mock.collected, makeTestSatelEvent(ct, index, true))
	}
}

func TestSatelIndexFiltering(t *testing.T) {
	tested := MakeFilterByTypeOrIndex([]SatelChangeType{}, []int{1, 3})
	mock := &GenericSyncMockFilter[satel.Event]{}

	tested.Then(mock)

	tested.Call(makeTestSatelEvent(satel.ArmedPartition, 1, true))
	tested.Call(makeTestSatelEvent(satel.DoorOpened, 2, true))
	tested.Call(makeTestSatelEvent(satel.PartitionAlarm, 3, true))
	tested.Call(makeTestSatelEvent(satel.PartitionFireAlarm, 4, true))
	tested.Call(makeTestSatelEvent(satel.TroublePart1, 5, true))
	tested.Call(makeTestSatelEvent(satel.ZoneTamper, 6, true))

	assert.Len(t, mock.collected, 2)
	assert.Contains(t, mock.collected, makeTestSatelEvent(satel.ArmedPartition, 1, true))
	assert.Contains(t, mock.collected, makeTestSatelEvent(satel.PartitionAlarm, 3, true))
}

func TestSatelIndexFiltering_NoAllowedEventTypesMeansAllAreAllowed(t *testing.T) {
	tested := MakeFilterByTypeOrIndex([]SatelChangeType{{satel.ArmedPartition}, {satel.PartitionFireAlarm}},
		[]int{})
	mock := &GenericSyncMockFilter[satel.Event]{}
	myReasonableMaxIndex := 100 // I wanted to use math.MaxInt at first, but it's kind of a waste of time here

	tested.Then(mock)

	for i := 0; i < myReasonableMaxIndex; i++ {
		tested.Call(makeTestSatelEvent(satel.ArmedPartition, i, true))
	}

	assert.Len(t, mock.collected, myReasonableMaxIndex)
	for i := 0; i < myReasonableMaxIndex; i++ {
		assert.Contains(t, mock.collected, makeTestSatelEvent(satel.ArmedPartition, i, true))
	}
}

func TestSatelLastSeenFiltering(t *testing.T) {
	f, err := os.CreateTemp("", "TestSatelLastSeenFiltering")
	assert.NoError(t, err)
	tempFileName := f.Name()
	assert.NoError(t, f.Close())
	defer os.Remove(f.Name())

	fakeLog := log.New(io.Discard, "", log.Ltime)
	ds := MakeDataStore(fakeLog, tempFileName)

	tested := MakeFilterByLastSeen(&ds)
	mock := &GenericSyncMockFilter[satel.Event]{}

	tested.Then(mock)

	tested.Call(makeTestSatelEvent(satel.ArmedPartition, 1, true))
	tested.Call(makeTestSatelEvent(satel.ArmedPartition, 2, true))
	tested.Call(makeTestSatelEvent(satel.ArmedPartition, 1, true))
	tested.Call(makeTestSatelEvent(satel.ArmedPartition, 1, false))
	tested.Call(makeTestSatelEvent(satel.ArmedPartition, 2, true))
	tested.Call(makeTestSatelEvent(satel.ArmedPartition, 1, false))

	assert.Len(t, mock.collected, 3)
	assert.Contains(t, mock.collected, makeTestSatelEvent(satel.ArmedPartition, 1, true))
	assert.Contains(t, mock.collected, makeTestSatelEvent(satel.ArmedPartition, 2, true))
	assert.Contains(t, mock.collected, makeTestSatelEvent(satel.ArmedPartition, 1, false))
}

func TestSatelLastSeenFilteringWithPersistence(t *testing.T) {
	f, err := os.CreateTemp("", "TestSatelLastSeenFilteringWithPersistence")
	assert.NoError(t, err)
	tempFileName := f.Name()
	assert.NoError(t, f.Close())
	defer os.Remove(f.Name())

	fakeLog := log.New(io.Discard, "", log.Ltime)
	ds := MakeDataStore(fakeLog, tempFileName)

	tested := MakeFilterByLastSeen(&ds)
	mock := &GenericSyncMockFilter[satel.Event]{}

	tested.Then(mock)

	tested.Call(makeTestSatelEvent(satel.ArmedPartition, 1, true))
	tested.Call(makeTestSatelEvent(satel.ArmedPartition, 2, true))
	tested.Call(makeTestSatelEvent(satel.ArmedPartition, 1, true))
	tested.Call(makeTestSatelEvent(satel.ArmedPartition, 1, false))
	tested.Call(makeTestSatelEvent(satel.ArmedPartition, 2, true))
	tested.Call(makeTestSatelEvent(satel.ArmedPartition, 1, false))

	assert.Len(t, mock.collected, 3)
	assert.Contains(t, mock.collected, makeTestSatelEvent(satel.ArmedPartition, 1, true))
	assert.Contains(t, mock.collected, makeTestSatelEvent(satel.ArmedPartition, 2, true))
	assert.Contains(t, mock.collected, makeTestSatelEvent(satel.ArmedPartition, 1, false))

	tested = nil
	mock = nil

	ds2 := MakeDataStore(fakeLog, tempFileName)

	tested2 := MakeFilterByLastSeen(&ds2)
	mock2 := &GenericSyncMockFilter[satel.Event]{}

	tested2.Then(mock2)

	tested2.Call(makeTestSatelEvent(satel.ArmedPartition, 1, false))
	tested2.Call(makeTestSatelEvent(satel.ArmedPartition, 1, false))
	tested2.Call(makeTestSatelEvent(satel.ArmedPartition, 1, true))
	tested2.Call(makeTestSatelEvent(satel.ArmedPartition, 2, true))
	tested2.Call(makeTestSatelEvent(satel.ArmedPartition, 2, true))

	assert.Len(t, mock2.collected, 1)
	assert.Contains(t, mock2.collected, makeTestSatelEvent(satel.ArmedPartition, 1, true))
}

type MockSleeper struct {
	ch        *chan<- interface{}
	callCount int
}

func (self *MockSleeper) Sleep(ch chan<- interface{}) {
	if self.ch == nil {
		self.ch = &ch
	}
	self.callCount += 1
}

type GenericSyncMockFilter[T any] struct {
	SyncFilterImpl[T]
	collected []T
}

func (self *GenericSyncMockFilter[T]) Call(msg T) {
	self.collected = append(self.collected, msg)
	self.CallNext(msg)
}

type SyncMockFilter = GenericSyncMockFilter[GenericMessage]

func TestSyncCollect(t *testing.T) {
	testEvents := make(chan GenericMessage)
	wg := sync.WaitGroup{}

	tested := CollectFromChannel[GenericMessage]{}
	mock := &SyncMockFilter{}
	mock2 := &SyncMockFilter{}

	tested.Then(mock).Then(mock2)

	wg.Add(1)
	tested.Collect(testEvents, &wg, func() { wg.Done() })

	testEvents <- makeGenericMessage(satel.ArmedPartition, 1, true)
	testEvents <- makeGenericMessage(satel.DoorOpened, 2, true)
	testEvents <- makeGenericMessage(satel.PartitionAlarm, 3, true)
	testEvents <- makeGenericMessage(satel.PartitionFireAlarm, 4, true)
	testEvents <- makeGenericMessage(satel.TroublePart1, 5, true)
	testEvents <- makeGenericMessage(satel.ZoneTamper, 6, true)

	close(testEvents)
	wg.Wait()

	assert.Len(t, mock.collected, 6)
	assert.Contains(t, mock.collected, makeGenericMessage(satel.ArmedPartition, 1, true))
	assert.Contains(t, mock.collected, makeGenericMessage(satel.DoorOpened, 2, true))
	assert.Contains(t, mock.collected, makeGenericMessage(satel.PartitionAlarm, 3, true))
	assert.Contains(t, mock.collected, makeGenericMessage(satel.PartitionFireAlarm, 4, true))
	assert.Contains(t, mock.collected, makeGenericMessage(satel.TroublePart1, 5, true))
	assert.Contains(t, mock.collected, makeGenericMessage(satel.ZoneTamper, 6, true))

	assert.Len(t, mock2.collected, 6)
	assert.Contains(t, mock2.collected, makeGenericMessage(satel.ArmedPartition, 1, true))
	assert.Contains(t, mock2.collected, makeGenericMessage(satel.DoorOpened, 2, true))
	assert.Contains(t, mock2.collected, makeGenericMessage(satel.PartitionAlarm, 3, true))
	assert.Contains(t, mock2.collected, makeGenericMessage(satel.PartitionFireAlarm, 4, true))
	assert.Contains(t, mock2.collected, makeGenericMessage(satel.TroublePart1, 5, true))
	assert.Contains(t, mock2.collected, makeGenericMessage(satel.ZoneTamper, 6, true))
}

func TestThrottleSync(t *testing.T) {
	wg := sync.WaitGroup{}
	fakeLog := log.New(io.Discard, "", log.Ltime)
	mockSleeper := MockSleeper{nil, 0}

	var (
		tplMessageTest1 = satel.BasicEventElement{Type: satel.ArmedPartition, Index: 1, Value: true}
		tplMessageTest2 = satel.BasicEventElement{Type: satel.ZoneViolation, Index: 2, Value: true}
		tplMessageTest3 = satel.BasicEventElement{Type: satel.ArmedPartition, Index: 1, Value: false}
		tplMessageTest4 = satel.BasicEventElement{Type: satel.ZoneViolation, Index: 2, Value: false}
	)

	tested := MakeThrottleSync(&mockSleeper, fakeLog, &wg)
	mock := &SyncMockFilter{}

	tested.Then(mock)

	tested.Call(GenericMessage{[]satel.BasicEventElement{tplMessageTest1}})
	tested.Call(GenericMessage{[]satel.BasicEventElement{tplMessageTest2}})
	tested.Call(GenericMessage{[]satel.BasicEventElement{tplMessageTest3}})
	*mockSleeper.ch <- nil

	tested.Call(GenericMessage{[]satel.BasicEventElement{tplMessageTest4}})

	tested.Close()
	wg.Wait()

	assert.Equal(t, 2, mockSleeper.callCount)
	assert.Len(t, mock.collected, 2)
	assert.Contains(t, mock.collected[0].Messages, tplMessageTest2)
	assert.Contains(t, mock.collected[0].Messages, tplMessageTest3)
	assert.Len(t, mock.collected[0].Messages, 2)

	assert.Contains(t, mock.collected[1].Messages, tplMessageTest4)
	assert.Len(t, mock.collected[1].Messages, 1)
}

func TestConvert_failsWhenNotConverting(t *testing.T) {
	a := assert.New(t)
	tested := MakeConvert(func(in int) GenericMessage {
		a.Equal(in, 1)
		return GenericMessage{}
	})
	mock := &GenericSyncMockFilter[int]{}

	a.Panics(func() {
		tested.Then(mock)
		tested.Call(1)
	})
}

func TestConvert(t *testing.T) {
	a := assert.New(t)
	numCalled := 0
	tested := MakeConvert(func(in int) GenericMessage {
		a.Equal(in, 1)
		numCalled += 1
		return GenericMessage{}
	})
	mock := &SyncMockFilter{}

	tested.ConvertTo(mock)
	tested.Call(1)

	a.Equal(numCalled, 1)
}