package packages

import (
	"fmt"
	"os"

	settings "github.com/DegustatorPonos/RuinesOfRafdolon/Settings"
)

type PackageDescription struct {
	Name string `json:"name"`
	Version uint64 `json:"version"`
	Type string `json:"type"`
}

type Package struct {
	Description PackageDescription `json:"description"`
}

func ReadPackage(dir os.DirEntry) (*Package, error) {
	var dirPath = ConcantinateFileLocation(settings.Current.PackagesLocation, dir.Name())
	var desc = PackageDescription{}
	if descErr := ReadJSONfromFile(ConcantinateFileLocation(dirPath, "Description.json"), &desc); descErr != nil {
		return nil, descErr
	}
	if descErr := desc.Validate(); descErr != nil {
		return nil, fmt.Errorf("Failed to parse descriptor: %s", descErr.Error())
	}
	return &Package{
		Description: desc,
	}, nil
}

func (base *PackageDescription) Validate() error {
	if base.Name == "" {
		return fmt.Errorf("Invalid package descriptor: the name cannot be empty")
	}
	if base.Version == 0{
		return fmt.Errorf("Invalid package descriptor: the version cannot be 0")
	}
	return nil
}