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package {{packageName}}

import (
    "bytes"
    "encoding/json"
    "errors"
    "time"
)

var ErrInvalidNullable = errors.New("nullable cannot have non-zero Value and ExplicitNull simultaneously")

// PtrBool is a helper routine that returns a pointer to given integer value.
func PtrBool(v bool) *bool { return &v }

// PtrInt is a helper routine that returns a pointer to given integer value.
func PtrInt(v int) *int { return &v }

// PtrInt32 is a helper routine that returns a pointer to given integer value.
func PtrInt32(v int32) *int32 { return &v }

// PtrInt64 is a helper routine that returns a pointer to given integer value.
func PtrInt64(v int64) *int64 { return &v }

// PtrFloat32 is a helper routine that returns a pointer to given float value.
func PtrFloat32(v float32) *float32 { return &v }

// PtrFloat64 is a helper routine that returns a pointer to given float value.
func PtrFloat64(v float64) *float64 { return &v }

// PtrString is a helper routine that returns a pointer to given string value.
func PtrString(v string) *string { return &v }

// PtrTime is helper routine that returns a pointer to given Time value.
func PtrTime(v time.Time) *time.Time { return &v }

type NullableBool struct {
    Value bool
    ExplicitNull bool
}

func (v NullableBool) MarshalJSON() ([]byte, error) {
    switch {
    case v.ExplicitNull && v.Value:
        return nil, ErrInvalidNullable
    case v.ExplicitNull:
        return []byte("null"), nil
    default:
        return json.Marshal(v.Value)
    }
}

func (v *NullableBool) UnmarshalJSON(src []byte) error {
    if bytes.Equal(src, []byte("null")) {
        v.ExplicitNull = true
        return nil
    }

    return json.Unmarshal(src, &v.Value)
}

type NullableInt struct {
    Value int
    ExplicitNull bool
}

func (v NullableInt) MarshalJSON() ([]byte, error) {
    switch {
    case v.ExplicitNull && v.Value != 0:
        return nil, ErrInvalidNullable
    case v.ExplicitNull:
        return []byte("null"), nil
    default:
        return json.Marshal(v.Value)
    }
}


func (v *NullableInt) UnmarshalJSON(src []byte) error {
    if bytes.Equal(src, []byte("null")) {
        v.ExplicitNull = true
        return nil
    }

    return json.Unmarshal(src, &v.Value)
}

type NullableInt32 struct {
    Value int32
    ExplicitNull bool
}

func (v NullableInt32) MarshalJSON() ([]byte, error) {
    switch {
    case v.ExplicitNull && v.Value != 0:
        return nil, ErrInvalidNullable
    case v.ExplicitNull:
        return []byte("null"), nil
    default:
        return json.Marshal(v.Value)
    }
}

func (v *NullableInt32) UnmarshalJSON(src []byte) error {
    if bytes.Equal(src, []byte("null")) {
        v.ExplicitNull = true
        return nil
    }

    return json.Unmarshal(src, &v.Value)
}

type NullableInt64 struct {
    Value int64
    ExplicitNull bool
}

func (v NullableInt64) MarshalJSON() ([]byte, error) {
    switch {
    case v.ExplicitNull && v.Value != 0:
        return nil, ErrInvalidNullable
    case v.ExplicitNull:
        return []byte("null"), nil
    default:
        return json.Marshal(v.Value)
    }
}

func (v *NullableInt64) UnmarshalJSON(src []byte) error {
    if bytes.Equal(src, []byte("null")) {
        v.ExplicitNull = true
        return nil
    }

    return json.Unmarshal(src, &v.Value)
}

type NullableFloat32 struct {
    Value float32
    ExplicitNull bool
}

func (v NullableFloat32) MarshalJSON() ([]byte, error) {
    switch {
    case v.ExplicitNull && v.Value != 0.0:
        return nil, ErrInvalidNullable
    case v.ExplicitNull:
        return []byte("null"), nil
    default:
        return json.Marshal(v.Value)
    }
}

func (v *NullableFloat32) UnmarshalJSON(src []byte) error {
    if bytes.Equal(src, []byte("null")) {
        v.ExplicitNull = true
        return nil
    }

    return json.Unmarshal(src, &v.Value)
}

type NullableFloat64 struct {
    Value float64
    ExplicitNull bool
}

func (v NullableFloat64) MarshalJSON() ([]byte, error) {
    switch {
    case v.ExplicitNull && v.Value != 0.0:
        return nil, ErrInvalidNullable
    case v.ExplicitNull:
        return []byte("null"), nil
    default:
        return json.Marshal(v.Value)
    }
}

func (v *NullableFloat64) UnmarshalJSON(src []byte) error {
    if bytes.Equal(src, []byte("null")) {
        v.ExplicitNull = true
        return nil
    }

    return json.Unmarshal(src, &v.Value)
}

type NullableString struct {
    Value string
    ExplicitNull bool
}

func (v NullableString) MarshalJSON() ([]byte, error) {
    switch {
    case v.ExplicitNull && v.Value != "":
        return nil, ErrInvalidNullable
    case v.ExplicitNull:
        return []byte("null"), nil
    default:
        return json.Marshal(v.Value)
    }
}

func (v *NullableString) UnmarshalJSON(src []byte) error {
    if bytes.Equal(src, []byte("null")) {
        v.ExplicitNull = true
        return nil
    }

    return json.Unmarshal(src, &v.Value)
}

type NullableTime struct {
    Value time.Time
    ExplicitNull bool
}

func (v NullableTime) MarshalJSON() ([]byte, error) {
    switch {
    case v.ExplicitNull && !v.Value.IsZero():
        return nil, ErrInvalidNullable
    case v.ExplicitNull:
        return []byte("null"), nil
    default:
        return v.Value.MarshalJSON()
    }
}

func (v *NullableTime) UnmarshalJSON(src []byte) error {
    if bytes.Equal(src, []byte("null")) {
        v.ExplicitNull = true
        return nil
    }

    return json.Unmarshal(src, &v.Value)
}