package config

import (
	"errors"
	"gopkg.in/yaml.v3"
	"os"
	"path/filepath"
)

type UniverseConfig struct {
	ServiceInfo *ServiceInfo                      `yaml:"service_info" json:"service_info" bson:"service_info"`
	Modules     map[string]map[string]interface{} `yaml:"modules" json:"modules" bson:"modules"`
}

var (
	wellKnownConfigPlaces []string = []string{
		"config.yaml",
		"config.yml",
	}
)

func LoadConfigFromDirectory[T any](dir string, out *T) error {
	for _, fileName := range wellKnownConfigPlaces {
		path := filepath.Join(dir, fileName)
		if _, err := os.Stat(path); os.IsNotExist(err) {
			continue
		}

		return LoadConfigFromPath(path, out)
	}
	return nil
}

func LoadConfigFromPath[T any](path string, out *T) error {
	ext := filepath.Ext(path)
	switch ext {
	case ".yaml", ".yml":
		// Load YAML config
		if err := LoadYamlConfigFromPath(path, out); err != nil {
			return err
		}
		return nil

	default:
		return errors.New("Universe config file must be .yaml or .yml")
	}
}

func LoadYamlConfigFromPath[T any](path string, out *T) error {
	file, err := os.Open(path)
	if err != nil {
		return err
	}

	defer file.Close()
	decoder := yaml.NewDecoder(file)
	if err := decoder.Decode(out); err != nil {
		return err
	}

	return nil
}