package resource

import (
	"bytes"
	"encoding/json"
	"github.com/bitly/go-simplejson"
	"gopkg.in/yaml.v3"
	"io/ioutil"
	"path/filepath"
)

type format string

const (
	formatOther format = "other"
	formatJson  format = "json"
	formatYaml  format = "yaml"
)

func read2Json(path string) (*simplejson.Json, error) {
	_bytes, e := ioutil.ReadFile(path)
	if e != nil {
		return nil, e
	}

	return simplejson.NewJson(_bytes)
}

func loadLocalFile(path string, target interface{}) error {
	_bytes, e := ioutil.ReadFile(path)
	if e != nil {
		return e
	}
	fm := determineFormat(path)
	if fm == formatJson {
		d := json.NewDecoder(bytes.NewReader(_bytes))
		d.UseNumber()

		return d.Decode(target)
	}
	return unmarshaler(determineFormat(path))(_bytes, target)
}

func determineFormat(path string) format {
	switch filepath.Ext(path) {
	case ".json":
		return formatJson
	case ".yaml", ".yml":
		return formatYaml
	}
	return formatOther
}

func unmarshaler(f format) func([]byte, interface{}) error {
	switch f {
	case formatJson:
		return json.Unmarshal
	case formatYaml:
		return yaml.Unmarshal
	}

	return func(bytes []byte, i interface{}) error {
		return nil
	}
}