package osbuild

import (

	"encoding/json"

	"errors"

)

// A Sources map contains all the sources made available to an osbuild run

type Sources map[string]Source

// Source specifies the operations of a given source-type.

type Source interface {

	isSource()

}

type rawSources map[string]json.RawMessage

// UnmarshalJSON unmarshals JSON into a Source object. Each type of source has

// a custom unmarshaller for its options, selected based on the source name.

func (sources *Sources) UnmarshalJSON(data []byte) error {

	var rawSources rawSources

	err := json.Unmarshal(data, &rawSources)

	if err != nil {

		return err

	}

	*sources = make(map[string]Source)

	for name, rawSource := range rawSources {

		var source Source

		switch name {

		case "org.osbuild.files":

			source = new(FilesSource)

		default:

			return errors.New("unexpected suorce name" + name)

		}

		err = json.Unmarshal(rawSource, source)

		if err != nil {

			return err

		}

		(*sources)[name] = source

	}

	return nil

}