package types

import (

"database/sql/driver"

"encoding/json"

"fmt"

)

// JSONArray defines a slice that is safe for json and db read/write.

type JSONArray[T any] []T

// internal alias to prevent recursion during marshalization.

type jsonArrayAlias[T any] JSONArray[T]

// MarshalJSON implements the [json.Marshaler] interface.

func (m JSONArray[T]) MarshalJSON() ([]byte, error) {

// initialize an empty map to ensure that `[]` is returned as json

if m == nil {

m = JSONArray[T]{}

}

return json.Marshal(jsonArrayAlias[T](m))

}

// String returns the string representation of the current json array.

func (m JSONArray[T]) String() string {

v, _ := m.MarshalJSON()

return string(v)

}

// Value implements the [driver.Valuer] interface.

func (m JSONArray[T]) Value() (driver.Value, error) {

data, err := json.Marshal(m)

return string(data), err

}

// Scan implements [sql.Scanner] interface to scan the provided value

// into the current JSONArray[T] instance.

func (m *JSONArray[T]) Scan(value any) error {

var data []byte

switch v := value.(type) {

case nil:

// no cast needed

case []byte:

data = v

case string:

data = []byte(v)

default:

return fmt.Errorf("failed to unmarshal JSONArray value: %q", value)

}

if len(data) == 0 {

data = []byte("[]")

}

return json.Unmarshal(data, m)

}