package recovery

import (
	"testing"

	"github.com/stretchr/testify/assert"
	"google.golang.org/protobuf/proto"

	"github.com/milvus-io/milvus-proto/go-api/v2/msgpb"
	"github.com/milvus-io/milvus-proto/go-api/v2/schemapb"
	"github.com/milvus-io/milvus/pkg/v2/proto/streamingpb"
	"github.com/milvus-io/milvus/pkg/v2/streaming/util/message"
	"github.com/milvus-io/milvus/pkg/v2/streaming/walimpls/impls/rmq"
)

func TestNewVChannelRecoveryInfoFromVChannelMeta(t *testing.T) {
	meta := []*streamingpb.VChannelMeta{
		{Vchannel: "vchannel-1"},
		{Vchannel: "vchannel-2"},
	}

	info := newVChannelRecoveryInfoFromVChannelMeta(meta)

	assert.Len(t, info, 2)
	assert.NotNil(t, info["vchannel-1"])
	assert.NotNil(t, info["vchannel-2"])
	assert.False(t, info["vchannel-1"].dirty)
	assert.False(t, info["vchannel-2"].dirty)

	snapshot, shouldBeRemoved := info["vchannel-1"].ConsumeDirtyAndGetSnapshot()
	assert.Nil(t, snapshot)
	assert.False(t, shouldBeRemoved)
}

func TestNewVChannelRecoveryInfoFromCreateCollectionMessage(t *testing.T) {
	schema1 := &schemapb.CollectionSchema{
		Name: "test-collection-1",
	}
	schema1Bytes, _ := proto.Marshal(schema1)

	// CreateCollection
	msg := message.NewCreateCollectionMessageBuilderV1().
		WithHeader(&message.CreateCollectionMessageHeader{
			CollectionId: 100,
			PartitionIds: []int64{101, 102},
		}).
		WithBody(&msgpb.CreateCollectionRequest{
			CollectionName: "test-collection",
			CollectionID:   100,
			PartitionIDs:   []int64{101, 102},
			Schema:         schema1Bytes,
		}).
		WithVChannel("vchannel-1").
		MustBuildMutable()
	msgID := rmq.NewRmqID(1)
	ts := uint64(12345)
	immutableMsg := msg.WithTimeTick(ts).WithLastConfirmed(msgID).IntoImmutableMessage(msgID)
	info := newVChannelRecoveryInfoFromCreateCollectionMessage(message.MustAsImmutableCreateCollectionMessageV1(immutableMsg))

	assert.Equal(t, "vchannel-1", info.meta.Vchannel)
	assert.Equal(t, streamingpb.VChannelState_VCHANNEL_STATE_NORMAL, info.meta.State)
	assert.Equal(t, ts, info.meta.CheckpointTimeTick)
	assert.Len(t, info.meta.CollectionInfo.Partitions, 2)
	idx, schema1Saved := info.GetSchema(0)
	assert.Equal(t, 0, idx)
	assert.True(t, proto.Equal(schema1, schema1Saved))
	assert.True(t, info.dirty)

	snapshot, shouldBeRemoved := info.ConsumeDirtyAndGetSnapshot()
	assert.NotNil(t, snapshot)
	assert.False(t, shouldBeRemoved)
	assert.False(t, info.dirty)
	assert.Equal(t, 1, len(info.meta.CollectionInfo.Schemas))

	snapshot, shouldBeRemoved = info.ConsumeDirtyAndGetSnapshot()
	assert.Nil(t, snapshot)
	assert.False(t, shouldBeRemoved)

	// CreatePartition
	msg3 := message.NewCreatePartitionMessageBuilderV1().
		WithHeader(&message.CreatePartitionMessageHeader{
			CollectionId: 100,
			PartitionId:  103,
		}).
		WithBody(&msgpb.CreatePartitionRequest{
			CollectionName: "test-collection",
			CollectionID:   100,
			PartitionID:    103,
		}).
		WithVChannel("vchannel-1").
		MustBuildMutable()
	msgID3 := rmq.NewRmqID(3)
	ts += 1
	immutableMsg3 := msg3.WithTimeTick(ts).WithLastConfirmed(msgID3).IntoImmutableMessage(msgID3)

	info.ObserveCreatePartition(message.MustAsImmutableCreatePartitionMessageV1(immutableMsg3))
	// idempotent
	info.ObserveCreatePartition(message.MustAsImmutableCreatePartitionMessageV1(immutableMsg3))
	assert.Equal(t, "vchannel-1", info.meta.Vchannel)
	assert.Equal(t, streamingpb.VChannelState_VCHANNEL_STATE_NORMAL, info.meta.State)
	assert.Equal(t, ts, info.meta.CheckpointTimeTick)
	assert.Len(t, info.meta.CollectionInfo.Partitions, 3)
	assert.True(t, info.dirty)

	snapshot, shouldBeRemoved = info.ConsumeDirtyAndGetSnapshot()
	assert.NotNil(t, snapshot)
	assert.False(t, shouldBeRemoved)
	assert.False(t, info.dirty)

	snapshot, shouldBeRemoved = info.ConsumeDirtyAndGetSnapshot()
	assert.Nil(t, snapshot)
	assert.False(t, shouldBeRemoved)
	assert.False(t, info.dirty)

	ts += 1
	immutableMsg3 = msg3.WithTimeTick(ts).WithLastConfirmed(msgID3).IntoImmutableMessage(msgID3)
	// idempotent
	info.ObserveCreatePartition(message.MustAsImmutableCreatePartitionMessageV1(immutableMsg3))
	assert.Len(t, info.meta.CollectionInfo.Partitions, 3)
	snapshot, shouldBeRemoved = info.ConsumeDirtyAndGetSnapshot()
	assert.Nil(t, snapshot)
	assert.False(t, shouldBeRemoved)
	assert.False(t, info.dirty)

	snapshot, shouldBeRemoved = info.ConsumeDirtyAndGetSnapshot()
	assert.Nil(t, snapshot)
	assert.False(t, shouldBeRemoved)
	assert.False(t, info.dirty)

	// DropPartition
	msg4 := message.NewDropPartitionMessageBuilderV1().
		WithHeader(&message.DropPartitionMessageHeader{
			CollectionId: 100,
			PartitionId:  101,
		}).
		WithBody(&msgpb.DropPartitionRequest{
			CollectionName: "test-collection",
			CollectionID:   100,
			PartitionID:    101,
		}).
		WithVChannel("vchannel-1").
		MustBuildMutable()
	msgID4 := rmq.NewRmqID(4)
	ts += 1
	immutableMsg4 := msg4.WithTimeTick(ts).WithLastConfirmed(msgID4).IntoImmutableMessage(msgID4)

	info.ObserveDropPartition(message.MustAsImmutableDropPartitionMessageV1(immutableMsg4))
	// idempotent
	info.ObserveDropPartition(message.MustAsImmutableDropPartitionMessageV1(immutableMsg4))
	assert.Equal(t, "vchannel-1", info.meta.Vchannel)
	assert.Equal(t, streamingpb.VChannelState_VCHANNEL_STATE_NORMAL, info.meta.State)
	assert.Equal(t, ts, info.meta.CheckpointTimeTick)
	assert.Len(t, info.meta.CollectionInfo.Partitions, 2)
	assert.NotContains(t, info.meta.CollectionInfo.Partitions, int64(101))
	assert.True(t, info.dirty)

	snapshot, shouldBeRemoved = info.ConsumeDirtyAndGetSnapshot()
	assert.NotNil(t, snapshot)
	assert.False(t, shouldBeRemoved)
	assert.False(t, info.dirty)

	snapshot, shouldBeRemoved = info.ConsumeDirtyAndGetSnapshot()
	assert.Nil(t, snapshot)
	assert.False(t, shouldBeRemoved)
	assert.False(t, info.dirty)

	ts += 1
	immutableMsg4 = msg4.WithTimeTick(ts).WithLastConfirmed(msgID4).IntoImmutableMessage(msgID4)
	// idempotent
	info.ObserveDropPartition(message.MustAsImmutableDropPartitionMessageV1(immutableMsg4))
	assert.Len(t, info.meta.CollectionInfo.Partitions, 2)
	snapshot, shouldBeRemoved = info.ConsumeDirtyAndGetSnapshot()
	assert.Nil(t, snapshot)
	assert.False(t, shouldBeRemoved)
	assert.False(t, info.dirty)

	snapshot, shouldBeRemoved = info.ConsumeDirtyAndGetSnapshot()
	assert.Nil(t, snapshot)
	assert.False(t, shouldBeRemoved)
	assert.False(t, info.dirty)

	// SchemaChange
	schema2 := &schemapb.CollectionSchema{
		Name: "test-collection-2",
	}
	msg5 := message.NewSchemaChangeMessageBuilderV2().
		WithHeader(&message.SchemaChangeMessageHeader{
			CollectionId: 100,
		}).
		WithBody(&message.SchemaChangeMessageBody{
			Schema: schema2,
		}).
		WithVChannel("vchannel-1").
		MustBuildMutable()
	msgID5 := rmq.NewRmqID(5)
	ts += 1
	immutableMsg5 := msg5.WithTimeTick(ts).WithLastConfirmed(msgID5).IntoImmutableMessage(msgID5)
	info.ObserveSchemaChange(message.MustAsImmutableCollectionSchemaChangeV2(immutableMsg5))

	idx, schema2Saved := info.GetSchema(0)
	assert.Equal(t, 1, idx)
	assert.True(t, proto.Equal(schema2, schema2Saved))
	idx, schema2Saved = info.GetSchema(ts)
	assert.Equal(t, 1, idx)
	assert.True(t, proto.Equal(schema2, schema2Saved))
	idx, schema2Saved = info.GetSchema(ts - 1)
	assert.Equal(t, 0, idx)
	assert.True(t, proto.Equal(schema1, schema2Saved))
	assert.True(t, info.dirty)

	snapshot, shouldBeRemoved = info.ConsumeDirtyAndGetSnapshot()
	assert.NotNil(t, snapshot)
	assert.False(t, shouldBeRemoved)
	assert.False(t, info.dirty)
	assert.Len(t, snapshot.CollectionInfo.Schemas, 2)

	// UpdateFlushCheckpoint
	info.UpdateFlushCheckpoint(&WALCheckpoint{
		MessageID: msgID5,
		TimeTick:  ts - 1,
	})
	assert.Equal(t, ts-1, info.flusherCheckpoint.TimeTick)
	assert.False(t, info.dirty)

	// schema change will be dropped by the flusher checkpoint.
	info.UpdateFlushCheckpoint(&WALCheckpoint{
		MessageID: msgID5,
		TimeTick:  ts + 1,
	})
	assert.Equal(t, ts+1, info.flusherCheckpoint.TimeTick)
	assert.True(t, info.dirty)
	idx, schema2Saved = info.GetSchema(ts - 1)
	assert.Equal(t, 0, idx)
	assert.Equal(t, streamingpb.VChannelSchemaState_VCHANNEL_SCHEMA_STATE_DROPPED, info.meta.CollectionInfo.Schemas[idx].State)
	assert.Equal(t, schema1.Name, schema2Saved.Name)
	idx, schema2Saved = info.GetSchema(ts)
	assert.Equal(t, 1, idx)
	assert.Equal(t, streamingpb.VChannelSchemaState_VCHANNEL_SCHEMA_STATE_NORMAL, info.meta.CollectionInfo.Schemas[idx].State)
	assert.Equal(t, schema2.Name, schema2Saved.Name)

	snapshot, shouldBeRemoved = info.ConsumeDirtyAndGetSnapshot()
	assert.NotNil(t, snapshot)
	assert.False(t, shouldBeRemoved)
	assert.False(t, info.dirty)
	assert.Len(t, info.meta.CollectionInfo.Schemas, 1)
	assert.True(t, proto.Equal(schema2, info.meta.CollectionInfo.Schemas[0].Schema))
	assert.Len(t, snapshot.CollectionInfo.Schemas, 2)
	assert.Equal(t, streamingpb.VChannelSchemaState_VCHANNEL_SCHEMA_STATE_DROPPED, snapshot.CollectionInfo.Schemas[0].State)
	assert.Equal(t, streamingpb.VChannelSchemaState_VCHANNEL_SCHEMA_STATE_NORMAL, snapshot.CollectionInfo.Schemas[1].State)

	// DropCollection
	msg2 := message.NewDropCollectionMessageBuilderV1().
		WithHeader(&message.DropCollectionMessageHeader{
			CollectionId: 100,
		}).
		WithBody(&msgpb.DropCollectionRequest{
			CollectionName: "test-collection",
			CollectionID:   100,
		}).
		WithVChannel("vchannel-1").
		MustBuildMutable()
	msgID2 := rmq.NewRmqID(2)
	ts += 1
	immutableMsg2 := msg2.WithTimeTick(ts).WithLastConfirmed(msgID2).IntoImmutableMessage(msgID2)

	info.ObserveDropCollection(message.MustAsImmutableDropCollectionMessageV1(immutableMsg2))
	assert.Equal(t, streamingpb.VChannelState_VCHANNEL_STATE_DROPPED, info.meta.State)
	assert.Equal(t, ts, info.meta.CheckpointTimeTick)
	assert.Len(t, info.meta.CollectionInfo.Partitions, 2)
	assert.True(t, info.dirty)

	snapshot, shouldBeRemoved = info.ConsumeDirtyAndGetSnapshot()
	assert.NotNil(t, snapshot)
	assert.True(t, shouldBeRemoved)
	assert.False(t, info.dirty)

	snapshot, shouldBeRemoved = info.ConsumeDirtyAndGetSnapshot()
	assert.Nil(t, snapshot)
	assert.True(t, shouldBeRemoved)
}