// Licensed to the Apache Software Foundation (ASF) 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 array

import (
	"github.com/apache/arrow-go/v18/arrow"
	"github.com/apache/arrow-go/v18/arrow/bitutil"
	"github.com/apache/arrow-go/v18/arrow/internal/debug"
	"github.com/apache/arrow-go/v18/arrow/memory"
	"github.com/apache/arrow-go/v18/internal/json"
)

{{range .In}}

type {{.Name}}Builder struct {
	builder

{{if .Opt.Parametric -}}
	dtype    *arrow.{{.Name}}Type
{{end -}}
	data    *memory.Buffer
	rawData []{{or .QualifiedType .Type}}
}

{{if .Opt.Parametric}}
func New{{.Name}}Builder(mem memory.Allocator, dtype *arrow.{{.Name}}Type) *{{.Name}}Builder {
	return &{{.Name}}Builder{builder: builder{refCount:1, mem: mem}, dtype: dtype}
}

func (b *{{.Name}}Builder) Type() arrow.DataType { return b.dtype }

{{else}}
func New{{.Name}}Builder(mem memory.Allocator) *{{.Name}}Builder {
	return &{{.Name}}Builder{builder: builder{refCount:1, mem: mem}}
}

func (b *{{.Name}}Builder) Type() arrow.DataType { return arrow.PrimitiveTypes.{{.Name}} }
{{end}}

// Release decreases the reference count by 1.
// When the reference count goes to zero, the memory is freed.
func (b *{{.Name}}Builder) Release() {
	debug.Assert(atomic.LoadInt64(&b.refCount) > 0, "too many releases")

	if atomic.AddInt64(&b.refCount, -1) == 0 {
		if b.nullBitmap != nil {
			b.nullBitmap.Release()
			b.nullBitmap = nil
		}
		if b.data != nil {
			b.data.Release()
			b.data = nil
			b.rawData = nil
		}
	}
}

func (b *{{.Name}}Builder) Append(v {{or .QualifiedType .Type}}) {
	b.Reserve(1)
	b.UnsafeAppend(v)
}

func (b *{{.Name}}Builder) AppendNull() {
	b.Reserve(1)
	b.UnsafeAppendBoolToBitmap(false)
}

func (b *{{.Name}}Builder) AppendNulls(n int) {
	for i := 0; i < n; i++ {
		b.AppendNull()
	}
}

func (b *{{.Name}}Builder) AppendEmptyValue() {
	b.Append(0)
}

func (b *{{.Name}}Builder) AppendEmptyValues(n int) {
	for i := 0; i < n; i ++ {
		b.AppendEmptyValue()
	}
}

func (b *{{.Name}}Builder) UnsafeAppend(v {{or .QualifiedType .Type}}) {
	bitutil.SetBit(b.nullBitmap.Bytes(), b.length)
	b.rawData[b.length] = v
	b.length++
}

func (b *{{.Name}}Builder) UnsafeAppendBoolToBitmap(isValid bool) {
	if isValid {
		bitutil.SetBit(b.nullBitmap.Bytes(), b.length)
	} else {
		b.nulls++
	}
	b.length++
}

// AppendValues will append the values in the v slice. The valid slice determines which values
// in v are valid (not null). The valid slice must either be empty or be equal in length to v. If empty,
// all values in v are appended and considered valid.
func (b *{{.Name}}Builder) AppendValues(v []{{or .QualifiedType .Type}}, valid []bool) {
	if len(v) != len(valid) && len(valid) != 0 {
		panic("len(v) != len(valid) && len(valid) != 0")
	}

	if len(v) == 0 {
		return
	}

	b.Reserve(len(v))
	arrow.{{.Name}}Traits.Copy(b.rawData[b.length:], v)
	b.builder.unsafeAppendBoolsToBitmap(valid, len(v))
}

func (b *{{.Name}}Builder) init(capacity int) {
	b.builder.init(capacity)

	b.data = memory.NewResizableBuffer(b.mem)
	bytesN := arrow.{{.Name}}Traits.BytesRequired(capacity)
	b.data.Resize(bytesN)
	b.rawData = arrow.{{.Name}}Traits.CastFromBytes(b.data.Bytes())
}

// Reserve ensures there is enough space for appending n elements
// by checking the capacity and calling Resize if necessary.
func (b *{{.Name}}Builder) Reserve(n int) {
	b.builder.reserve(n, b.Resize)
}

// Resize adjusts the space allocated by b to n elements. If n is greater than b.Cap(),
// additional memory will be allocated. If n is smaller, the allocated memory may reduced.
func (b *{{.Name}}Builder) Resize(n int) {
	nBuilder := n
	if n < minBuilderCapacity {
		n = minBuilderCapacity
	}

	if b.capacity == 0 {
		b.init(n)
	} else {
		b.builder.resize(nBuilder, b.init)
		b.data.Resize(arrow.{{.Name}}Traits.BytesRequired(n))
		b.rawData = arrow.{{.Name}}Traits.CastFromBytes(b.data.Bytes())
	}
}

func (b *{{.Name}}Builder) Value(i int) {{or .QualifiedType .Type}} {
	return b.rawData[i]
}

// NewArray creates a {{.Name}} array from the memory buffers used by the builder and resets the {{.Name}}Builder
// so it can be used to build a new array.
func (b *{{.Name}}Builder) NewArray() arrow.Array {
	return b.New{{.Name}}Array()
}

// New{{.Name}}Array creates a {{.Name}} array from the memory buffers used by the builder and resets the {{.Name}}Builder
// so it can be used to build a new array.
func (b *{{.Name}}Builder) New{{.Name}}Array() (a *{{.Name}}) {
	data := b.newData()
	a = New{{.Name}}Data(data)
	data.Release()
	return
}

func (b *{{.Name}}Builder) newData() (data *Data) {
	bytesRequired := arrow.{{.Name}}Traits.BytesRequired(b.length)
	if bytesRequired > 0 && bytesRequired < b.data.Len() {
		// trim buffers
		b.data.Resize(bytesRequired)
	}
{{if .Opt.Parametric -}}
	data = NewData(b.dtype, b.length, []*memory.Buffer{b.nullBitmap, b.data}, nil, b.nulls, 0)
{{else -}}
	data = NewData(arrow.PrimitiveTypes.{{.Name}}, b.length, []*memory.Buffer{b.nullBitmap, b.data}, nil, b.nulls, 0)
{{end -}}
	b.reset()

	if b.data != nil {
		b.data.Release()
		b.data = nil
		b.rawData = nil
	}

	return
}

func (b *{{.Name}}Builder) AppendValueFromString(s string) error {
	if s == NullValueStr {
		b.AppendNull()
		return nil
	}
  {{if or (eq .Name "Date32") -}}
  	tm, err := time.Parse("2006-01-02", s)
    if err != nil {
      b.AppendNull()
      return err
    }
    b.Append(arrow.Date32FromTime(tm))
  {{else if or (eq .Name "Date64") -}}
  	tm, err := time.Parse("2006-01-02", s)
    if err != nil {
      b.AppendNull()
      return err
    }
    b.Append(arrow.Date64FromTime(tm))
  {{else if or (eq .Name "Time32") -}}
  	val, err := arrow.Time32FromString(s, b.dtype.Unit)
    if err != nil {
      b.AppendNull()
      return err
    }
    b.Append(val)
  {{else if or (eq .Name "Time64") -}}
    val, err := arrow.Time64FromString(s, b.dtype.Unit)
    if err != nil {
      b.AppendNull()
      return err
    }
    b.Append(val)
  {{else if (eq .Name "Duration") -}}
	dur, err := time.ParseDuration(s)
	if err != nil {
		return err
	}

	b.Append(arrow.Duration(dur / b.dtype.Unit.Multiplier()))
  {{else if or (eq .Name "Int8") (eq .Name "Int16") (eq .Name "Int32") (eq .Name "Int64") -}}
    v, err := strconv.ParseInt(s, 10, {{.Size}} * 8)
    if err != nil {
        b.AppendNull()
        return err
    }
    b.Append({{.name}}(v))
  {{else if or (eq .Name "Uint8") (eq .Name "Uint16") (eq .Name "Uint32") (eq .Name "Uint64") -}}
    v, err := strconv.ParseUint(s, 10, {{.Size}} * 8)
    if err != nil {
        b.AppendNull()
        return err
    }
    b.Append({{.name}}(v))
  {{else if or (eq .Name "Float32") (eq .Name "Float64") -}}
    v, err := strconv.ParseFloat(s, {{.Size}} * 8)
    if err != nil {
      b.AppendNull()
      return err
    }
    b.Append({{.name}}(v))
  {{end -}}
	return nil
}

func (b *{{.Name}}Builder) UnmarshalOne(dec *json.Decoder) error {
	t, err := dec.Token()
	if err != nil {
		return err
	}

	switch v := t.(type) {
	case nil:
		b.AppendNull()
{{if or (eq .Name "Date32") (eq .Name "Date64") -}}
	case string:
		tm, err := time.Parse("2006-01-02", v)
		if err != nil {
			return &json.UnmarshalTypeError{
				Value: v,
				Type: reflect.TypeOf({{.QualifiedType}}(0)),
				Offset: dec.InputOffset(),
			}
		}

		b.Append({{.QualifiedType}}FromTime(tm))
	case json.Number:
		n, err := v.Int64()
		if err != nil {
			return &json.UnmarshalTypeError{
				Value: v.String(),
				Type: reflect.TypeOf({{.QualifiedType}}(0)),
				Offset: dec.InputOffset(),
			}
		}
		b.Append({{.QualifiedType}}(n))
	case float64:
		b.Append({{.QualifiedType}}(v))
{{else if or (eq .Name "Time32") (eq .Name "Time64") -}}
	case string:
		tm, err := {{.QualifiedType}}FromString(v, b.dtype.Unit)
		if err != nil {
			return &json.UnmarshalTypeError{
				Value: v,
				Type: reflect.TypeOf({{.QualifiedType}}(0)),
				Offset: dec.InputOffset(),
			}
		}

		b.Append(tm)
	case json.Number:
		n, err := v.Int64()
		if err != nil {
			return &json.UnmarshalTypeError{
				Value: v.String(),
				Type: reflect.TypeOf({{.QualifiedType}}(0)),
				Offset: dec.InputOffset(),
			}
		}
		b.Append({{.QualifiedType}}(n))
	case float64:
		b.Append({{.QualifiedType}}(v))
{{else if eq .Name "Duration" -}}
	case json.Number:
		n, err := v.Int64()
		if err != nil {
			return &json.UnmarshalTypeError{
				Value: v.String(),
				Type: reflect.TypeOf({{.QualifiedType}}(0)),
				Offset: dec.InputOffset(),
			}
		}
		b.Append({{.QualifiedType}}(n))
	case float64:
		b.Append({{.QualifiedType}}(v))
	case string:
		// be flexible for specifying durations by accepting forms like
		// 3h2m0.5s regardless of the unit and converting it to the proper
		// precision.
		val, err := time.ParseDuration(v)
		if err != nil {
			// if we got an error, maybe it was because the attempt to create
			// a time.Duration (int64) in nanoseconds would overflow. check if
			// the string is just a large number followed by the unit suffix
			if strings.HasSuffix(v, b.dtype.Unit.String()) {
				value, err := strconv.ParseInt(v[:len(v)-len(b.dtype.Unit.String())], 10, 64)
				if err == nil {
					b.Append(arrow.Duration(value))
					break
				}
			}

			return &json.UnmarshalTypeError{
				Value: v,
				Type: reflect.TypeOf({{.QualifiedType}}(0)),
				Offset: dec.InputOffset(),
			}
		}

		switch b.dtype.Unit {
		case arrow.Nanosecond:
			b.Append({{.QualifiedType}}(val.Nanoseconds()))
		case arrow.Microsecond:
			b.Append({{.QualifiedType}}(val.Microseconds()))
		case arrow.Millisecond:
			b.Append({{.QualifiedType}}(val.Milliseconds()))
		case arrow.Second:
			b.Append({{.QualifiedType}}(val.Seconds()))
		}
{{else}}
	case string:
{{if or (eq .Name "Float32") (eq .Name "Float64") -}}
		f, err := strconv.ParseFloat(v, {{.Size}}*8)
{{else if eq (printf "%.1s" .Name) "U" -}}
		f, err := strconv.ParseUint(v, 10, {{.Size}}*8)
{{else -}}
		f, err := strconv.ParseInt(v, 10, {{.Size}}*8)
{{end -}}
		if err != nil {
			return &json.UnmarshalTypeError{
				Value: v,
				Type: reflect.TypeOf({{.name}}(0)),
				Offset: dec.InputOffset(),
			}
		}
		b.Append({{.name}}(f))
	case float64:
		b.Append({{.name}}(v))
	case json.Number:
{{if or (eq .Name "Float32") (eq .Name "Float64") -}}
		f, err := strconv.ParseFloat(v.String(), {{.Size}}*8)
{{else if eq (printf "%.1s" .Name) "U" -}}
		f, err := strconv.ParseUint(v.String(), 10, {{.Size}}*8)
{{else -}}
		f, err := strconv.ParseInt(v.String(), 10, {{.Size}}*8)
{{end -}}
		if err != nil {
			return &json.UnmarshalTypeError{
				Value: v.String(),
				Type: reflect.TypeOf({{.name}}(0)),
				Offset: dec.InputOffset(),
			}
		}
		b.Append({{.name}}(f))
{{end}}
	default:
		return &json.UnmarshalTypeError{
			Value: fmt.Sprint(t),
			Type: reflect.TypeOf({{or .QualifiedType .Type}}(0)),
			Offset: dec.InputOffset(),
		}
	}

	return nil
}

func (b *{{.Name}}Builder) Unmarshal(dec *json.Decoder) error {
	for dec.More() {
		if err := b.UnmarshalOne(dec); err != nil {
			return err
		}
	}
	return nil
}

func (b *{{.Name}}Builder) UnmarshalJSON(data []byte) error {
	dec := json.NewDecoder(bytes.NewReader(data))
	t, err := dec.Token()
	if err != nil {
		return err
	}

	if delim, ok := t.(json.Delim); !ok || delim != '[' {
		return fmt.Errorf("binary builder must unpack from json array, found %s", delim)
	}

	return b.Unmarshal(dec)
}
{{end}}

var (
{{- range .In}}
	_ Builder = (*{{.Name}}Builder)(nil)
{{- end}}
)
