// Copyright 2024 Matthew Rich <matthewrich.conf@gmail.com>. All rights reserved.

package codec

import (
	"io"
	"fmt"
	"errors"
	"encoding/json"
	"gopkg.in/yaml.v3"
)

const (
	FormatYml Format = "yml"
	FormatYaml Format = "yaml"
	FormatJson Format = "json"
	FormatProtoBuf Format = "protobuf"
)

var ErrInvalidFormat error = errors.New("invalid Format value")

type Format string

func (f *Format) Validate() error {
	switch *f {
	case FormatYml, FormatYaml, FormatJson, FormatProtoBuf:
		return nil
	default:
		return fmt.Errorf("%w: %s", ErrInvalidFormat, *f)
	}
}

func (f *Format) Set(value string) (err error) {
	if err = (*Format)(&value).Validate(); err == nil {
		err = f.UnmarshalValue(value)
	}
	return
}

func (f *Format) UnmarshalValue(value string) error {
	switch value {
	case string(FormatYml):
		*f = FormatYaml
	case string(FormatYaml), string(FormatJson), string(FormatProtoBuf):
		*f = Format(value)
	default:
		return ErrInvalidFormat
	}
	return nil
}

func (f *Format) UnmarshalJSON(data []byte) error {
	var s string
	if unmarshalFormatTypeErr := json.Unmarshal(data, &s); unmarshalFormatTypeErr != nil {
		return unmarshalFormatTypeErr
	}
	return f.UnmarshalValue(s)
}

func (f *Format) UnmarshalYAML(value *yaml.Node) error {
	var s string
	if err := value.Decode(&s); err != nil {
		return err
	}
	return f.UnmarshalValue(s)
}

func (f Format) Encoder(w io.Writer) Encoder {
	return NewEncoder(w, f)
}

func (f Format) Decoder(r io.Reader) Decoder {
	return NewDecoder(r, f)
}

func (f Format) StringDecoder(s string) Decoder {
	return NewStringDecoder(s, f)
}

func (f Format) Serialize(object any, w io.Writer) error {
	return f.Encoder(w).Encode(object)
}

func (f Format) Deserialize(r io.Reader, object any) error {
	return f.Decoder(r).Decode(object)
}