// File Definition fetcher
//
// Handles extracting service definitions from local files.

package service_definition

import (
	"fmt"
	"github.com/goccy/go-yaml"
	"os"
)

type FileDefinitionFetcher struct{}

func NewFileDefinitionFetcher() *FileDefinitionFetcher {
	return &FileDefinitionFetcher{}
}

// Retrieves a service definition from the given filepath.
func (f FileDefinitionFetcher) GetDefinition(path string) (ServiceDefinition, error) {
	var definition ServiceDefinition

	defData, err := os.ReadFile(path)

	if err != nil {
		return ServiceDefinition{}, fmt.Errorf("Could not find service configuration file: %s", path)
	}

	if err = yaml.Unmarshal(defData, &definition); err != nil {
		return ServiceDefinition{}, fmt.Errorf("Service definition does not satisfy expected schema: %s", path)
	}

	return definition, nil
}