package layerconfig

import (
	"encoding/json"
	"io/ioutil"
)

type LayerContainer struct {
	Layers []Layer `json:"layers"`
}

type Layer struct {
	Id   int    `json:"id"`
	Name string `json:"name"`
	To   int    `json:"to"`
	From int    `json:"from"`
}

var DefaultLayers []Layer

func init() {
	DefaultLayers = []Layer{
		Layer{
			Id:   0,
			Name: "Base",
			From: -16,
			To:   160,
		},
	}
}

func ParseFile(filename string) ([]Layer, error) {

	data, err := ioutil.ReadFile(filename)
	if err != nil {
		return nil, err
	}

	lc := LayerContainer{}

	err = json.Unmarshal(data, &lc)
	if err != nil {
		return nil, err
	}

	return lc.Layers, nil
}