// Copyright (C) 2020 Storj Labs, Inc.
// See LICENSE for copying information.

package accounting_test

import (
	"context"
	"strings"
	"testing"
	"time"

	"github.com/stretchr/testify/require"

	"storj.io/common/memory"
	"storj.io/common/testcontext"
	"storj.io/common/testrand"
	"storj.io/common/uuid"
	"storj.io/storj/private/testplanet"
	"storj.io/storj/satellite/accounting"
	"storj.io/storj/satellite/metainfo/metabase"
	"storj.io/storj/storage"
)

func TestBilling_DownloadWithoutExpansionFactor(t *testing.T) {
	t.Skip("disable until the bug SM-102 is fixed")
	testplanet.Run(t, testplanet.Config{
		SatelliteCount: 1, StorageNodeCount: 4, UplinkCount: 1,
		Reconfigure: testplanet.Reconfigure{
			Satellite: testplanet.ReconfigureRS(2, 3, 4, 4),
		},
	}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
		const (
			bucketName = "testbucket"
			filePath   = "test/path"
		)

		var (
			satelliteSys = planet.Satellites[0]
			uplink       = planet.Uplinks[0]
			projectID    = uplink.Projects[0].ID
			since        = time.Now()
		)

		satelliteSys.Accounting.Tally.Loop.Pause()

		data := testrand.Bytes(10 * memory.KiB)
		err := uplink.Upload(ctx, satelliteSys, bucketName, filePath, data)
		require.NoError(t, err)

		_, err = uplink.Download(ctx, satelliteSys, bucketName, filePath)
		require.NoError(t, err)

		// trigger tally so it gets all set up and can return a storage usage
		satelliteSys.Accounting.Tally.Loop.TriggerWait()

		usage := getProjectTotal(ctx, t, planet, 0, projectID, since)

		// TODO: this assertion fails due to the bug SM-102
		require.Equal(t, len(data), int(usage.Egress), "Egress should be equal to the downloaded file size")
	})
}

func TestBilling_InlineFiles(t *testing.T) {
	testplanet.Run(t, testplanet.Config{
		SatelliteCount: 1, StorageNodeCount: 1, UplinkCount: 1,
	}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
		const (
			bucketName = "testbucket"
			firstPath  = "path"
			secondPath = "another_path"
		)

		var (
			satelliteSys = planet.Satellites[0]
			uplink       = planet.Uplinks[0]
			projectID    = uplink.Projects[0].ID
			since        = time.Now()
		)

		satelliteSys.Accounting.Tally.Loop.Pause()

		// Prepare two inline segments for the Uplink to upload
		firstSegment := testrand.Bytes(2 * memory.KiB)
		secondSegment := testrand.Bytes(3 * memory.KiB)

		err := uplink.Upload(ctx, satelliteSys, bucketName, firstPath, firstSegment)
		require.NoError(t, err)
		err = uplink.Upload(ctx, satelliteSys, bucketName, secondPath, secondSegment)
		require.NoError(t, err)

		_, err = uplink.Download(ctx, satelliteSys, bucketName, firstPath)
		require.NoError(t, err)

		// trigger tally so it gets all set up and can return a storage usage
		satelliteSys.Accounting.Tally.Loop.TriggerWait()

		usage := getProjectTotal(ctx, t, planet, 0, projectID, since)

		// Usage should be > 0
		require.NotZero(t, usage.ObjectCount)
		require.NotZero(t, usage.Storage)
		require.NotZero(t, usage.Egress)
	})
}

func TestBilling_FilesAfterDeletion(t *testing.T) {
	testplanet.Run(t, testplanet.Config{
		SatelliteCount: 1, StorageNodeCount: 4, UplinkCount: 1,
	}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
		const (
			bucketName = "testbucket"
			filePath   = "test/path"
		)

		var (
			satelliteSys = planet.Satellites[0]
			uplink       = planet.Uplinks[0]
			projectID    = uplink.Projects[0].ID
			since        = time.Now()
		)

		satelliteSys.Accounting.Tally.Loop.Pause()

		// Prepare some data for the Uplink to upload
		uploadData := testrand.Bytes(5 * memory.KiB)
		err := uplink.Upload(ctx, satelliteSys, bucketName, filePath, uploadData)
		require.NoError(t, err)

		// trigger tally so it gets all set up and can return a storage usage
		satelliteSys.Accounting.Tally.Loop.TriggerWait()

		// Get usage for uploaded file before we delete it
		usageBefore := getProjectTotal(ctx, t, planet, 0, projectID, since)

		// ObjectCount and Storage should be > 0
		require.NotZero(t, usageBefore.ObjectCount)
		require.NotZero(t, usageBefore.Storage)
		require.Zero(t, usageBefore.Egress)

		err = uplink.DeleteObject(ctx, satelliteSys, bucketName, filePath)
		require.NoError(t, err)

		err = uplink.DeleteBucket(ctx, satelliteSys, bucketName)
		require.NoError(t, err)

		// Get usage after file was deleted
		usageAfter := getProjectTotal(ctx, t, planet, 0, projectID, since)

		// Verify data is correct. We don’t bill for the data after deleting objects, usage should be equal
		require.Equal(t, usageBefore.ObjectCount, usageAfter.ObjectCount, "Object count should be equal")
		require.Equal(t, usageBefore.Storage, usageAfter.Storage, "Storage should be equal")
		require.Zero(t, usageAfter.Egress, "Egress should be 0")
	})
}

func TestBilling_TrafficAfterFileDeletion(t *testing.T) {
	testplanet.Run(t, testplanet.Config{
		SatelliteCount: 1, StorageNodeCount: 4, UplinkCount: 1,
		Reconfigure: testplanet.Reconfigure{
			Satellite: testplanet.ReconfigureRS(2, 3, 4, 4),
		},
	}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
		const (
			bucketName = "testbucket"
			filePath   = "test/path"
		)

		var (
			satelliteSys = planet.Satellites[0]
			uplink       = planet.Uplinks[0]
			projectID    = uplink.Projects[0].ID
		)
		err := planet.Uplinks[0].CreateBucket(ctx, planet.Satellites[0], bucketName)
		require.NoError(t, err)

		// stop any async flushes because we want to be sure when some values are
		// written to avoid races
		satelliteSys.Orders.Chore.Loop.Pause()

		data := testrand.Bytes(5 * memory.KiB)
		err = uplink.Upload(ctx, satelliteSys, bucketName, filePath, data)
		require.NoError(t, err)

		_, err = uplink.Download(ctx, satelliteSys, bucketName, filePath)
		require.NoError(t, err)

		err = uplink.DeleteObject(ctx, satelliteSys, bucketName, filePath)
		require.NoError(t, err)

		err = uplink.DeleteBucket(ctx, satelliteSys, bucketName)
		require.NoError(t, err)

		// Check that download traffic gets billed even if the file and bucket was deleted
		usage := getProjectTotal(ctx, t, planet, 0, projectID, time.Now().Add(-30*time.Millisecond))
		require.NotZero(t, usage.Egress, "Egress should not be empty")
	})
}

func TestBilling_AuditRepairTraffic(t *testing.T) {
	testplanet.Run(t, testplanet.Config{
		SatelliteCount: 1, StorageNodeCount: 6, UplinkCount: 1,
		Reconfigure: testplanet.Reconfigure{
			Satellite: testplanet.ReconfigureRS(2, 3, 4, 4),
		},
	}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
		const (
			bucketName = "a-bucket"
			objectKey  = "object-filename"
		)

		satelliteSys := planet.Satellites[0]
		satelliteSys.Audit.Worker.Loop.Pause()
		satelliteSys.Repair.Checker.Loop.Pause()
		satelliteSys.Repair.Repairer.Loop.Pause()
		// stop any async flushes because we want to be sure when some values are
		// written to avoid races
		satelliteSys.Orders.Chore.Loop.Pause()

		for _, sn := range planet.StorageNodes {
			sn.Storage2.Orders.Sender.Pause()
		}

		uplnk := planet.Uplinks[0]
		{
			data := testrand.Bytes(10 * memory.KiB)
			err := uplnk.Upload(ctx, satelliteSys, bucketName, objectKey, data)
			require.NoError(t, err)
		}

		// make sure we have at least one tally in db, so when we call
		// getProjectStorage it returns something
		satelliteSys.Accounting.Tally.Loop.TriggerWait()

		_, err := uplnk.Download(ctx, satelliteSys, bucketName, objectKey)
		require.NoError(t, err)

		var (
			projectID = uplnk.Projects[0].ID
			since     = time.Now()
		)
		projectTotal := getProjectTotal(ctx, t, planet, 0, projectID, since)
		require.NotZero(t, projectTotal.Egress)

		// get the only metainfo record (our upload)
		key, err := planet.Satellites[0].Metainfo.Database.List(ctx, nil, 10)
		require.NoError(t, err)
		require.Len(t, key, 1)
		ptr, err := satelliteSys.Metainfo.Service.Get(ctx, metabase.SegmentKey(key[0]))
		require.NoError(t, err)

		// Cause repair traffic
		stoppedNodeID := ptr.GetRemote().GetRemotePieces()[0].NodeId
		err = planet.StopNodeAndUpdate(ctx, planet.FindNode(stoppedNodeID))
		require.NoError(t, err)

		runningNodes := make([]*testplanet.StorageNode, 0)
		for _, node := range planet.StorageNodes {
			if node.ID() != stoppedNodeID {
				runningNodes = append(runningNodes, node)
			}
		}

		// trigger repair
		_, err = satelliteSys.Repairer.SegmentRepairer.Repair(ctx, key[0].String())
		require.NoError(t, err)

		// get the only metainfo record (our upload)
		key, err = planet.Satellites[0].Metainfo.Database.List(ctx, nil, 1)
		require.NoError(t, err)
		require.Len(t, key, 1)

		ptr2, err := satelliteSys.Metainfo.Service.Get(ctx, metabase.SegmentKey(key[0]))
		require.NoError(t, err)

		remotePieces := ptr2.GetRemote().GetRemotePieces()
		require.NotEqual(t, ptr, ptr2)
		for _, piece := range remotePieces {
			require.NotEqual(t, stoppedNodeID, piece.NodeId, "there shouldn't be pieces in stopped nodes")
		}

		projectTotalAfterRepair := getProjectTotalFromStorageNodes(ctx, t, planet, 0, projectID, since, runningNodes)
		require.Equal(t, projectTotal.Egress, projectTotalAfterRepair.Egress, "bandwidth totals")
	})
}

func TestBilling_UploadNoEgress(t *testing.T) {
	testplanet.Run(t, testplanet.Config{
		SatelliteCount: 1, StorageNodeCount: 4, UplinkCount: 1,
		Reconfigure: testplanet.Reconfigure{
			Satellite: testplanet.ReconfigureRS(2, 3, 4, 4),
		},
	}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
		const (
			bucketName = "a-bucket"
			objectKey  = "object-filename"
		)

		satelliteSys := planet.Satellites[0]
		// Make sure that we don't have interference with billed repair traffic
		// in case of a bug. There is a specific test to verify that the repair
		// traffic isn't billed.
		satelliteSys.Audit.Chore.Loop.Stop()
		satelliteSys.Repair.Repairer.Loop.Stop()
		// stop any async flushes because we want to be sure when some values are
		// written to avoid races
		satelliteSys.Orders.Chore.Loop.Pause()

		var (
			uplnk     = planet.Uplinks[0]
			projectID = uplnk.Projects[0].ID
		)

		since := time.Now().Add(-10 * time.Hour)
		usage := getProjectTotal(ctx, t, planet, 0, projectID, since)
		require.Zero(t, usage.Egress, "billed usage")

		{
			data := testrand.Bytes(10 * memory.KiB)
			err := uplnk.Upload(ctx, satelliteSys, bucketName, objectKey, data)
			require.NoError(t, err)
		}

		usage = getProjectTotal(ctx, t, planet, 0, projectID, since)
		require.Zero(t, usage.Egress, "billed usage")
	})
}

func TestBilling_DownloadTraffic(t *testing.T) {
	testplanet.Run(t, testplanet.Config{
		SatelliteCount: 1, StorageNodeCount: 4, UplinkCount: 1,
		Reconfigure: testplanet.Reconfigure{
			Satellite: testplanet.ReconfigureRS(2, 3, 4, 4),
		},
	}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
		const (
			bucketName = "a-bucket"
			objectKey  = "object-filename"
		)

		satelliteSys := planet.Satellites[0]
		// Make sure that we don't have interference with billed repair traffic
		// in case of a bug. There is a specific test to verify that the repair
		// traffic isn't billed.
		satelliteSys.Audit.Chore.Loop.Stop()
		satelliteSys.Repair.Repairer.Loop.Stop()
		// stop any async flushes because we want to be sure when some values are
		// written to avoid races
		satelliteSys.Orders.Chore.Loop.Pause()

		var (
			uplnk     = planet.Uplinks[0]
			projectID = uplnk.Projects[0].ID
		)

		{
			data := testrand.Bytes(10 * memory.KiB)
			err := uplnk.Upload(ctx, satelliteSys, bucketName, objectKey, data)
			require.NoError(t, err)
		}

		_, err := uplnk.Download(ctx, satelliteSys, bucketName, objectKey)
		require.NoError(t, err)

		since := time.Now().Add(-10 * time.Hour)
		usage := getProjectTotal(ctx, t, planet, 0, projectID, since)
		require.NotZero(t, usage.Egress, "billed usage")
	})
}

func TestBilling_ExpiredFiles(t *testing.T) {
	testplanet.Run(t, testplanet.Config{
		SatelliteCount: 1, StorageNodeCount: 4, UplinkCount: 1,
	}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
		const (
			bucketName = "a-bucket"
			objectKey  = "object-filename"
		)

		satelliteSys := planet.Satellites[0]
		satelliteSys.Audit.Chore.Loop.Stop()
		satelliteSys.Repair.Repairer.Loop.Stop()

		satelliteSys.Accounting.Tally.Loop.Pause()

		tallies := getTallies(ctx, t, planet, 0)
		require.Zero(t, len(tallies), "There should be no tally at this point")

		now := time.Now()
		expirationDate := now.Add(time.Hour)

		{
			uplink := planet.Uplinks[0]
			data := testrand.Bytes(128 * memory.KiB)
			err := uplink.UploadWithExpiration(ctx, satelliteSys, bucketName, objectKey, data, expirationDate)
			require.NoError(t, err)
		}
		require.NoError(t, planet.WaitForStorageNodeEndpoints(ctx))

		tallies = getTallies(ctx, t, planet, 0)
		require.NotZero(t, len(tallies), "There should be at least one tally")

		// set the tally service to be in the future for the next get tallies call. it should
		// not add any tallies.
		planet.Satellites[0].Accounting.Tally.SetNow(func() time.Time {
			return now.Add(2 * time.Hour)
		})
		newTallies := getTallies(ctx, t, planet, 0)
		require.Equal(t, tallies, newTallies)
	})
}

func getTallies(ctx context.Context, t *testing.T, planet *testplanet.Planet, satelliteIdx int) []accounting.BucketTally {
	t.Helper()
	sat := planet.Satellites[satelliteIdx]
	sat.Accounting.Tally.Loop.TriggerWait()
	sat.Accounting.Tally.Loop.Pause()

	tallies, err := sat.DB.ProjectAccounting().GetTallies(ctx)
	require.NoError(t, err)
	return tallies
}

func TestBilling_ZombieSegments(t *testing.T) {
	// failing test - see https://storjlabs.atlassian.net/browse/SM-592
	t.Skip("Zombie segments do get billed. Wait for resolution of SM-592")
	testplanet.Run(t, testplanet.Config{
		SatelliteCount: 1, StorageNodeCount: 4, UplinkCount: 1,
		Reconfigure: testplanet.Reconfigure{
			Satellite: testplanet.MaxSegmentSize(5 * memory.KiB),
		},
	}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
		const (
			bucketName = "a-bucket"
			objectKey  = "object-filename"
		)

		satelliteSys := planet.Satellites[0]
		satelliteSys.Audit.Chore.Loop.Stop()
		satelliteSys.Repair.Repairer.Loop.Stop()
		satelliteSys.Accounting.Tally.Loop.Pause()

		uplnk := planet.Uplinks[0]
		{
			data := testrand.Bytes(10 * memory.KiB)
			err := uplnk.Upload(ctx, satelliteSys, bucketName, objectKey, data)
			require.NoError(t, err)
		}

		// trigger tally so it gets all set up and can return a storage usage
		satelliteSys.Accounting.Tally.Loop.TriggerWait()

		projectID := uplnk.Projects[0].ID

		{ // delete last segment from metainfo to get zombie segments
			keys, err := planet.Satellites[0].Metainfo.Database.List(ctx, nil, 10)
			require.NoError(t, err)

			var lastSegmentKey storage.Key
			for _, key := range keys {
				if strings.Contains(key.String(), "/l/") {
					lastSegmentKey = key
				}
			}
			require.NotNil(t, lastSegmentKey)

			err = satelliteSys.Metainfo.Service.UnsynchronizedDelete(ctx, metabase.SegmentKey(lastSegmentKey))
			require.NoError(t, err)

			err = uplnk.DeleteObject(ctx, satelliteSys, bucketName, objectKey)
			require.Error(t, err)
		}

		from := time.Now()
		storageAfterDelete := getProjectTotal(ctx, t, planet, 0, projectID, from).Storage
		require.Equal(t, 0.0, storageAfterDelete, "zombie segments billed")
	})
}

// getProjectTotal returns the total used egress,  storage, objectCount for the
// projectID in the satellite referenced by satelliteIdx index.
func getProjectTotal(
	ctx context.Context, t *testing.T, planet *testplanet.Planet, satelliteIdx int,
	projectID uuid.UUID, since time.Time,
) *accounting.ProjectUsage {
	t.Helper()

	return getProjectTotalFromStorageNodes(ctx, t, planet, satelliteIdx, projectID, since, planet.StorageNodes)
}

// getProjectTotalFromStorageNodes returns used egress, storage, objectCount for the
// projectID in the satellite referenced by satelliteIdx index, asking orders
// to storageNodes nodes.
func getProjectTotalFromStorageNodes(
	ctx context.Context, t *testing.T, planet *testplanet.Planet, satelliteIdx int,
	projectID uuid.UUID, since time.Time, storageNodes []*testplanet.StorageNode,
) *accounting.ProjectUsage {
	t.Helper()

	// Wait for the SNs endpoints to finish their work
	require.NoError(t, planet.WaitForStorageNodeEndpoints(ctx))

	// Ensure all nodes have sent up any orders for the time period we're calculating
	for _, sn := range storageNodes {
		sn.Storage2.Orders.SendOrders(ctx, since.Add(24*time.Hour))
	}

	sat := planet.Satellites[satelliteIdx]
	sat.Accounting.Tally.Loop.TriggerWait()

	// flush rollups write cache
	sat.Orders.Chore.Loop.TriggerWait()

	usage, err := sat.DB.ProjectAccounting().GetProjectTotal(ctx, projectID, since, time.Now())
	require.NoError(t, err)

	return usage
}