// Licensed to the LF AI & Data foundation under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package storage

import (
	"io"
	"reflect"
	"testing"

	"github.com/apache/arrow/go/v12/arrow"
	"github.com/apache/arrow/go/v12/arrow/array"
	"github.com/apache/arrow/go/v12/arrow/memory"
	"github.com/stretchr/testify/assert"

	"github.com/milvus-io/milvus-proto/go-api/v2/schemapb"
	"github.com/milvus-io/milvus/pkg/common"
)

func TestSerDe(t *testing.T) {
	type args struct {
		dt schemapb.DataType
		v  any
	}
	tests := []struct {
		name  string
		args  args
		want  interface{}
		want1 bool
	}{
		{"test bool", args{dt: schemapb.DataType_Bool, v: true}, true, true},
		{"test bool null", args{dt: schemapb.DataType_Bool, v: nil}, nil, true},
		{"test bool negative", args{dt: schemapb.DataType_Bool, v: -1}, nil, false},
		{"test int8", args{dt: schemapb.DataType_Int8, v: int8(1)}, int8(1), true},
		{"test int8 null", args{dt: schemapb.DataType_Int8, v: nil}, nil, true},
		{"test int8 negative", args{dt: schemapb.DataType_Int8, v: true}, nil, false},
		{"test int16", args{dt: schemapb.DataType_Int16, v: int16(1)}, int16(1), true},
		{"test int16 null", args{dt: schemapb.DataType_Int16, v: nil}, nil, true},
		{"test int16 negative", args{dt: schemapb.DataType_Int16, v: true}, nil, false},
		{"test int32", args{dt: schemapb.DataType_Int32, v: int32(1)}, int32(1), true},
		{"test int32 null", args{dt: schemapb.DataType_Int32, v: nil}, nil, true},
		{"test int32 negative", args{dt: schemapb.DataType_Int32, v: true}, nil, false},
		{"test int64", args{dt: schemapb.DataType_Int64, v: int64(1)}, int64(1), true},
		{"test int64 null", args{dt: schemapb.DataType_Int64, v: nil}, nil, true},
		{"test int64 negative", args{dt: schemapb.DataType_Int64, v: true}, nil, false},
		{"test float32", args{dt: schemapb.DataType_Float, v: float32(1)}, float32(1), true},
		{"test float32 null", args{dt: schemapb.DataType_Float, v: nil}, nil, true},
		{"test float32 negative", args{dt: schemapb.DataType_Float, v: -1}, nil, false},
		{"test float64", args{dt: schemapb.DataType_Double, v: float64(1)}, float64(1), true},
		{"test float64 null", args{dt: schemapb.DataType_Double, v: nil}, nil, true},
		{"test float64 negative", args{dt: schemapb.DataType_Double, v: -1}, nil, false},
		{"test string", args{dt: schemapb.DataType_String, v: "test"}, "test", true},
		{"test string null", args{dt: schemapb.DataType_String, v: nil}, nil, true},
		{"test string negative", args{dt: schemapb.DataType_String, v: -1}, nil, false},
		{"test varchar", args{dt: schemapb.DataType_VarChar, v: "test"}, "test", true},
		{"test varchar null", args{dt: schemapb.DataType_VarChar, v: nil}, nil, true},
		{"test varchar negative", args{dt: schemapb.DataType_VarChar, v: -1}, nil, false},
		{"test array negative", args{dt: schemapb.DataType_Array, v: "{}"}, nil, false},
		{"test array null", args{dt: schemapb.DataType_Array, v: nil}, nil, true},
		{"test json", args{dt: schemapb.DataType_JSON, v: []byte("{}")}, []byte("{}"), true},
		{"test json null", args{dt: schemapb.DataType_JSON, v: nil}, nil, true},
		{"test json negative", args{dt: schemapb.DataType_JSON, v: -1}, nil, false},
		{"test float vector", args{dt: schemapb.DataType_FloatVector, v: []float32{1.0}}, []float32{1.0}, true},
		{"test float vector null", args{dt: schemapb.DataType_FloatVector, v: nil}, nil, true},
		{"test float vector negative", args{dt: schemapb.DataType_FloatVector, v: []int{1}}, nil, false},
		{"test bool vector", args{dt: schemapb.DataType_BinaryVector, v: []byte{0xff}}, []byte{0xff}, true},
		{"test float16 vector", args{dt: schemapb.DataType_Float16Vector, v: []byte{0xff, 0xff}}, []byte{0xff, 0xff}, true},
		{"test bfloat16 vector", args{dt: schemapb.DataType_BFloat16Vector, v: []byte{0xff, 0xff}}, []byte{0xff, 0xff}, true},
		{"test bfloat16 vector null", args{dt: schemapb.DataType_BFloat16Vector, v: nil}, nil, true},
		{"test bfloat16 vector negative", args{dt: schemapb.DataType_BFloat16Vector, v: -1}, nil, false},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			dt := tt.args.dt
			v := tt.args.v
			builder := array.NewBuilder(memory.DefaultAllocator, serdeMap[dt].arrowType(1))
			serdeMap[dt].serialize(builder, v)
			// assert.True(t, ok)
			a := builder.NewArray()
			got, got1 := serdeMap[dt].deserialize(a, 0)
			if !reflect.DeepEqual(got, tt.want) {
				t.Errorf("deserialize() got = %v, want %v", got, tt.want)
			}
			if got1 != tt.want1 {
				t.Errorf("deserialize() got1 = %v, want %v", got1, tt.want1)
			}
		})
	}
}

func TestArrowSchema(t *testing.T) {
	fields := []arrow.Field{{Name: "1", Type: arrow.BinaryTypes.String, Nullable: true}}
	builder := array.NewBuilder(memory.DefaultAllocator, arrow.BinaryTypes.String)
	builder.AppendValueFromString("1")
	record := array.NewRecord(arrow.NewSchema(fields, nil), []arrow.Array{builder.NewArray()}, 1)
	t.Run("test composite record", func(t *testing.T) {
		cr := &compositeRecord{
			recs:   make(map[FieldID]arrow.Record, 1),
			schema: make(map[FieldID]schemapb.DataType, 1),
		}
		cr.recs[0] = record
		cr.schema[0] = schemapb.DataType_String
		expected := arrow.NewSchema(fields, nil)
		assert.Equal(t, expected, cr.ArrowSchema())
	})

	t.Run("test simple arrow record", func(t *testing.T) {
		cr := &simpleArrowRecord{
			r:         record,
			schema:    make(map[FieldID]schemapb.DataType, 1),
			field2Col: make(map[FieldID]int, 1),
		}
		cr.schema[0] = schemapb.DataType_String
		expected := arrow.NewSchema(fields, nil)
		assert.Equal(t, expected, cr.ArrowSchema())

		sr := newSelectiveRecord(cr, 0)
		assert.Equal(t, expected, sr.ArrowSchema())
	})
}

func BenchmarkDeserializeReader(b *testing.B) {
	len := 1000000
	blobs, err := generateTestData(len)
	assert.NoError(b, err)
	b.ResetTimer()

	for i := 0; i < b.N; i++ {
		reader, err := NewBinlogDeserializeReader(blobs, common.RowIDField)
		assert.NoError(b, err)
		defer reader.Close()
		for i := 0; i < len; i++ {
			err = reader.Next()
			_ = reader.Value()
			assert.NoError(b, err)
		}
		err = reader.Next()
		assert.Equal(b, io.EOF, err)
	}
}

func BenchmarkBinlogIterator(b *testing.B) {
	len := 1000000
	blobs, err := generateTestData(len)
	assert.NoError(b, err)
	b.ResetTimer()

	for i := 0; i < b.N; i++ {
		itr, err := NewInsertBinlogIterator(blobs, common.RowIDField, schemapb.DataType_Int64)
		assert.NoError(b, err)
		defer itr.Dispose()
		for i := 0; i < len; i++ {
			assert.True(b, itr.HasNext())
			_, err = itr.Next()
			assert.NoError(b, err)
		}
		assert.False(b, itr.HasNext())
	}
}