// Copyright (C) 2019 Storj Labs, Inc.
// See LICENSE for copying information.

package gracefulexit_test

import (
	"testing"
	"time"

	"github.com/stretchr/testify/require"
	"go.uber.org/zap"
	"go.uber.org/zap/zaptest"

	"storj.io/common/errs2"
	"storj.io/common/memory"
	"storj.io/common/rpc/rpcstatus"
	"storj.io/common/testcontext"
	"storj.io/common/testrand"
	"storj.io/storj/private/testplanet"
	"storj.io/storj/satellite"
	"storj.io/storj/satellite/overlay"
	"storj.io/storj/storagenode"
	"storj.io/storj/storagenode/blobstore/testblobs"
	"storj.io/storj/storagenode/gracefulexit"
)

func TestWorkerSuccess(t *testing.T) {
	const successThreshold = 4
	testplanet.Run(t, testplanet.Config{
		SatelliteCount:   1,
		StorageNodeCount: successThreshold + 1,
		UplinkCount:      1,
		Reconfigure: testplanet.Reconfigure{
			Satellite: testplanet.Combine(
				testplanet.ReconfigureRS(2, 3, successThreshold, successThreshold),
				func(log *zap.Logger, index int, config *satellite.Config) {
					// this test can be removed entirely when we are using time-based GE everywhere.
					config.GracefulExit.TimeBased = false
				},
			),
			StorageNode: func(index int, config *storagenode.Config) {
				config.GracefulExit.NumWorkers = 2
				config.GracefulExit.NumConcurrentTransfers = 2
				config.GracefulExit.MinBytesPerSecond = 128
				config.GracefulExit.MinDownloadTimeout = 2 * time.Minute
			},
		},
	}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
		satellite := planet.Satellites[0]
		ul := planet.Uplinks[0]

		err := ul.Upload(ctx, satellite, "testbucket", "test/path1", testrand.Bytes(5*memory.KiB))
		require.NoError(t, err)

		exitingNode, err := findNodeToExit(ctx, planet)
		require.NoError(t, err)
		exitingNode.GracefulExit.Chore.Loop.Pause()

		exitStatusReq := overlay.ExitStatusRequest{
			NodeID:          exitingNode.ID(),
			ExitInitiatedAt: time.Now(),
		}
		_, err = satellite.Overlay.DB.UpdateExitStatus(ctx, &exitStatusReq)
		require.NoError(t, err)

		// run the satellite ranged loop to build the transfer queue.
		_, err = satellite.RangedLoop.RangedLoop.Service.RunOnce(ctx)
		require.NoError(t, err)

		// check that the satellite knows the storage node is exiting.
		exitingNodes, err := satellite.DB.OverlayCache().GetExitingNodes(ctx)
		require.NoError(t, err)
		require.Len(t, exitingNodes, 1)
		require.Equal(t, exitingNode.ID(), exitingNodes[0].NodeID)

		queueItems, err := satellite.DB.GracefulExit().GetIncomplete(ctx, exitingNode.ID(), 10, 0)
		require.NoError(t, err)
		require.Len(t, queueItems, 1)

		// run the SN chore again to start processing transfers.
		worker := gracefulexit.NewWorker(zaptest.NewLogger(t), exitingNode.GracefulExit.Service, exitingNode.PieceTransfer.Service, exitingNode.Dialer, satellite.NodeURL(), exitingNode.Config.GracefulExit)
		err = worker.Run(ctx)
		require.NoError(t, err)

		progress, err := satellite.DB.GracefulExit().GetProgress(ctx, exitingNode.ID())
		require.NoError(t, err)
		require.EqualValues(t, progress.PiecesFailed, 0)
		require.EqualValues(t, progress.PiecesTransferred, 1)

		exitStatus, err := satellite.DB.OverlayCache().GetExitStatus(ctx, exitingNode.ID())
		require.NoError(t, err)
		require.NotNil(t, exitStatus.ExitFinishedAt)
		require.True(t, exitStatus.ExitSuccess)
	})
}

func TestWorkerTimeout(t *testing.T) {
	const successThreshold = 4
	testplanet.Run(t, testplanet.Config{
		SatelliteCount:   1,
		StorageNodeCount: successThreshold + 1,
		UplinkCount:      1,
		Reconfigure: testplanet.Reconfigure{
			StorageNodeDB: func(index int, db storagenode.DB, log *zap.Logger) (storagenode.DB, error) {
				return testblobs.NewSlowDB(log.Named("slowdb"), db), nil
			},
			Satellite: testplanet.Combine(
				testplanet.ReconfigureRS(2, 3, successThreshold, successThreshold),
				func(log *zap.Logger, index int, config *satellite.Config) {
					// this test can be removed entirely when we are using time-based GE everywhere.
					config.GracefulExit.TimeBased = false
				},
			),
			StorageNode: func(index int, config *storagenode.Config) {
				config.GracefulExit.NumWorkers = 2
				config.GracefulExit.NumConcurrentTransfers = 2
				// This config value will create a very short timeframe allowed for receiving
				// data from storage nodes. This will cause context to cancel with timeout.
				config.GracefulExit.MinBytesPerSecond = 10 * memory.MiB
				config.GracefulExit.MinDownloadTimeout = 2 * time.Millisecond
			},
		},
	}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
		satellite := planet.Satellites[0]
		ul := planet.Uplinks[0]

		err := ul.Upload(ctx, satellite, "testbucket", "test/path1", testrand.Bytes(5*memory.KiB))
		require.NoError(t, err)

		exitingNode, err := findNodeToExit(ctx, planet)
		require.NoError(t, err)
		exitingNode.GracefulExit.Chore.Loop.Pause()

		exitStatusReq := overlay.ExitStatusRequest{
			NodeID:          exitingNode.ID(),
			ExitInitiatedAt: time.Now(),
		}
		_, err = satellite.Overlay.DB.UpdateExitStatus(ctx, &exitStatusReq)
		require.NoError(t, err)

		// run the satellite ranged loop to build the transfer queue.
		_, err = satellite.RangedLoop.RangedLoop.Service.RunOnce(ctx)
		require.NoError(t, err)

		// check that the satellite knows the storage node is exiting.
		exitingNodes, err := satellite.DB.OverlayCache().GetExitingNodes(ctx)
		require.NoError(t, err)
		require.Len(t, exitingNodes, 1)
		require.Equal(t, exitingNode.ID(), exitingNodes[0].NodeID)

		queueItems, err := satellite.DB.GracefulExit().GetIncomplete(ctx, exitingNode.ID(), 10, 0)
		require.NoError(t, err)
		require.Len(t, queueItems, 1)

		storageNodeDB := exitingNode.DB.(*testblobs.SlowDB)
		// make uploads on storage node slower than the timeout for transferring bytes to another node
		delay := 200 * time.Millisecond
		storageNodeDB.SetLatency(delay)

		// run the SN chore again to start processing transfers.
		worker := gracefulexit.NewWorker(zaptest.NewLogger(t), exitingNode.GracefulExit.Service, exitingNode.PieceTransfer.Service, exitingNode.Dialer, satellite.NodeURL(), exitingNode.Config.GracefulExit)
		err = worker.Run(ctx)
		require.NoError(t, err)

		progress, err := satellite.DB.GracefulExit().GetProgress(ctx, exitingNode.ID())
		require.NoError(t, err)
		require.EqualValues(t, progress.PiecesFailed, 1)
		require.EqualValues(t, progress.PiecesTransferred, 0)

		exitStatus, err := satellite.DB.OverlayCache().GetExitStatus(ctx, exitingNode.ID())
		require.NoError(t, err)
		require.NotNil(t, exitStatus.ExitFinishedAt)
		require.False(t, exitStatus.ExitSuccess)
	})
}

func TestWorkerFailure_IneligibleNodeAge(t *testing.T) {
	t.Run("TimeBased=true", func(t *testing.T) { testWorkerFailure_IneligibleNodeAge(t, true) })
	t.Run("TimeBased=false", func(t *testing.T) { testWorkerFailure_IneligibleNodeAge(t, false) })
}

func testWorkerFailure_IneligibleNodeAge(t *testing.T, timeBased bool) {
	const successThreshold = 4
	testplanet.Run(t, testplanet.Config{
		SatelliteCount:   1,
		StorageNodeCount: 5,
		UplinkCount:      1,
		Reconfigure: testplanet.Reconfigure{
			Satellite: testplanet.Combine(
				func(log *zap.Logger, index int, config *satellite.Config) {
					// Set the required node age to 1 month.
					config.GracefulExit.NodeMinAgeInMonths = 1
					config.GracefulExit.TimeBased = timeBased
				},
				testplanet.ReconfigureRS(2, 3, successThreshold, successThreshold),
			),

			StorageNode: func(index int, config *storagenode.Config) {
				config.GracefulExit.NumWorkers = 2
				config.GracefulExit.NumConcurrentTransfers = 2
				config.GracefulExit.MinBytesPerSecond = 128
				config.GracefulExit.MinDownloadTimeout = 2 * time.Minute
			},
		},
	}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
		satellite := planet.Satellites[0]
		ul := planet.Uplinks[0]

		err := ul.Upload(ctx, satellite, "testbucket", "test/path1", testrand.Bytes(5*memory.KiB))
		require.NoError(t, err)

		exitingNode, err := findNodeToExit(ctx, planet)
		require.NoError(t, err)
		exitingNode.GracefulExit.Chore.Loop.Pause()

		_, piecesContentSize, err := exitingNode.Storage2.BlobsCache.SpaceUsedForPieces(ctx)
		require.NoError(t, err)
		err = exitingNode.DB.Satellites().InitiateGracefulExit(ctx, satellite.ID(), time.Now(), piecesContentSize)
		require.NoError(t, err)

		worker := gracefulexit.NewWorker(zaptest.NewLogger(t), exitingNode.GracefulExit.Service, exitingNode.PieceTransfer.Service, exitingNode.Dialer, satellite.NodeURL(), exitingNode.Config.GracefulExit)
		err = worker.Run(ctx)
		require.Error(t, err)
		require.True(t, errs2.IsRPC(err, rpcstatus.FailedPrecondition))

		result, err := exitingNode.DB.Satellites().ListGracefulExits(ctx)
		require.NoError(t, err)
		require.Len(t, result, 0)
	})
}