package datastore

import (
	"strconv"
	"testing"
	"time"

	"github.com/WatchBeam/clock"
	"github.com/kolide/kolide/server/kolide"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func testCountHostsInTargets(t *testing.T, ds kolide.Datastore) {
	if ds.Name() == "inmem" {
		t.Skip("inmem is being deprecated, test skipped")
	}

	mockClock := clock.NewMockClock()

	hostCount := 0
	initHost := func(seenTime time.Time, distributedInterval uint, configTLSRefresh uint) *kolide.Host {
		hostCount += 1
		h, err := ds.NewHost(&kolide.Host{
			OsqueryHostID:       strconv.Itoa(hostCount),
			DetailUpdateTime:    mockClock.Now(),
			SeenTime:            mockClock.Now(),
			NodeKey:             strconv.Itoa(hostCount),
			DistributedInterval: distributedInterval,
			ConfigTLSRefresh:    configTLSRefresh,
		})
		require.Nil(t, err)
		require.Nil(t, ds.MarkHostSeen(h, seenTime))
		return h
	}

	// Checks in every
	h1 := initHost(mockClock.Now().Add(-1*time.Second), 10, 60)
	h2 := initHost(mockClock.Now().Add(-1*time.Hour), 30, 7200)
	h3 := initHost(mockClock.Now().Add(-5*time.Second), 20, 20)
	h4 := initHost(mockClock.Now().Add(-47*time.Second), 10, 10)
	h5 := initHost(mockClock.Now(), 5, 5)
	const thirtyDaysAndAMinuteAgo = -1 * (30*24*60 + 1)
	h6 := initHost(mockClock.Now().Add(thirtyDaysAndAMinuteAgo*time.Minute), 3600, 3600)

	l1, err := ds.NewLabel(&kolide.Label{
		Name:  "label foo",
		Query: "query foo",
	})
	require.Nil(t, err)
	require.NotZero(t, l1.ID)

	l2, err := ds.NewLabel(&kolide.Label{
		Name:  "label bar",
		Query: "query foo",
	})
	require.Nil(t, err)
	require.NotZero(t, l2.ID)

	for _, h := range []*kolide.Host{h1, h2, h3, h6} {
		err = ds.RecordLabelQueryExecutions(h, map[uint]bool{l1.ID: true}, mockClock.Now())
		assert.Nil(t, err)
	}

	for _, h := range []*kolide.Host{h3, h4, h5} {
		err = ds.RecordLabelQueryExecutions(h, map[uint]bool{l2.ID: true}, mockClock.Now())
		assert.Nil(t, err)
	}

	metrics, err := ds.CountHostsInTargets(nil, []uint{l1.ID, l2.ID}, mockClock.Now())
	require.Nil(t, err)
	assert.Equal(t, uint(6), metrics.TotalHosts)
	assert.Equal(t, uint(2), metrics.OfflineHosts)
	assert.Equal(t, uint(3), metrics.OnlineHosts)
	assert.Equal(t, uint(1), metrics.MissingInActionHosts)

	metrics, err = ds.CountHostsInTargets([]uint{h1.ID, h2.ID}, []uint{l1.ID, l2.ID}, mockClock.Now())
	require.Nil(t, err)
	assert.Equal(t, uint(6), metrics.TotalHosts)
	assert.Equal(t, uint(2), metrics.OfflineHosts)
	assert.Equal(t, uint(3), metrics.OnlineHosts)
	assert.Equal(t, uint(1), metrics.MissingInActionHosts)

	metrics, err = ds.CountHostsInTargets([]uint{h1.ID, h2.ID}, nil, mockClock.Now())
	require.Nil(t, err)
	assert.Equal(t, uint(2), metrics.TotalHosts)
	assert.Equal(t, uint(1), metrics.OnlineHosts)
	assert.Equal(t, uint(1), metrics.OfflineHosts)
	assert.Equal(t, uint(0), metrics.MissingInActionHosts)

	metrics, err = ds.CountHostsInTargets([]uint{h1.ID}, []uint{l2.ID}, mockClock.Now())
	require.Nil(t, err)
	assert.Equal(t, uint(4), metrics.TotalHosts)
	assert.Equal(t, uint(3), metrics.OnlineHosts)
	assert.Equal(t, uint(1), metrics.OfflineHosts)
	assert.Equal(t, uint(0), metrics.MissingInActionHosts)

	metrics, err = ds.CountHostsInTargets(nil, nil, mockClock.Now())
	require.Nil(t, err)
	assert.Equal(t, uint(0), metrics.TotalHosts)
	assert.Equal(t, uint(0), metrics.OnlineHosts)
	assert.Equal(t, uint(0), metrics.OfflineHosts)
	assert.Equal(t, uint(0), metrics.MissingInActionHosts)

	metrics, err = ds.CountHostsInTargets([]uint{}, []uint{}, mockClock.Now())
	require.Nil(t, err)
	assert.Equal(t, uint(0), metrics.TotalHosts)
	assert.Equal(t, uint(0), metrics.OnlineHosts)
	assert.Equal(t, uint(0), metrics.OfflineHosts)
	assert.Equal(t, uint(0), metrics.MissingInActionHosts)

	// Advance clock so all hosts are offline
	mockClock.AddTime(2 * time.Minute)
	metrics, err = ds.CountHostsInTargets(nil, []uint{l1.ID, l2.ID}, mockClock.Now())
	require.Nil(t, err)
	assert.Equal(t, uint(6), metrics.TotalHosts)
	assert.Equal(t, uint(0), metrics.OnlineHosts)
	assert.Equal(t, uint(5), metrics.OfflineHosts)
	assert.Equal(t, uint(1), metrics.MissingInActionHosts)

}

func testHostStatus(t *testing.T, ds kolide.Datastore) {
	if ds.Name() == "inmem" {
		t.Skip("inmem is being deprecated, test skipped")
	}

	mockClock := clock.NewMockClock()

	h, err := ds.EnrollHost("1", 24)
	require.Nil(t, err)

	// Make host no longer appear new
	mockClock.AddTime(36 * time.Hour)

	expectOnline := kolide.TargetMetrics{TotalHosts: 1, OnlineHosts: 1}
	expectOffline := kolide.TargetMetrics{TotalHosts: 1, OfflineHosts: 1}
	expectMIA := kolide.TargetMetrics{TotalHosts: 1, MissingInActionHosts: 1}

	var testCases = []struct {
		seenTime            time.Time
		distributedInterval uint
		configTLSRefresh    uint
		metrics             kolide.TargetMetrics
	}{
		{mockClock.Now().Add(-30 * time.Second), 10, 3600, expectOnline},
		{mockClock.Now().Add(-45 * time.Second), 10, 3600, expectOffline},
		{mockClock.Now().Add(-30 * time.Second), 3600, 10, expectOnline},
		{mockClock.Now().Add(-45 * time.Second), 3600, 10, expectOffline},

		{mockClock.Now().Add(-70 * time.Second), 60, 60, expectOnline},
		{mockClock.Now().Add(-91 * time.Second), 60, 60, expectOffline},

		{mockClock.Now().Add(-1 * time.Second), 10, 10, expectOnline},
		{mockClock.Now().Add(-1 * time.Minute), 10, 10, expectOffline},
		{mockClock.Now().Add(-31 * 24 * time.Hour), 10, 10, expectMIA},

		// Ensure behavior is reasonable if we don't have the values
		{mockClock.Now().Add(-1 * time.Second), 0, 0, expectOnline},
		{mockClock.Now().Add(-1 * time.Minute), 0, 0, expectOffline},
		{mockClock.Now().Add(-31 * 24 * time.Hour), 0, 0, expectMIA},
	}

	for _, tt := range testCases {
		t.Run("", func(t *testing.T) {
			// Save interval values
			h.DistributedInterval = tt.distributedInterval
			h.ConfigTLSRefresh = tt.configTLSRefresh
			require.Nil(t, ds.SaveHost(h))

			// Mark seen
			require.Nil(t, ds.MarkHostSeen(h, tt.seenTime))

			// Verify status
			metrics, err := ds.CountHostsInTargets([]uint{h.ID}, []uint{}, mockClock.Now())
			require.Nil(t, err)
			assert.Equal(t, tt.metrics, metrics)
		})
	}
}