// Package config provides an interface to load and store config files
// using the XDG standard ($HOME/.config/FRMS) as the base directory
//
// WARNING: only built for Linux
package config

import (
	"FRMS/internal/pkg/logging"
	"errors"
	"fmt"
	"os"

	"github.com/spf13/viper"
)

// LoadConfig takes a filename as an aruguement and returns a *viper.Viper object.
// Loads and stores config files into the base directory according to XDG standard ($HOME/.config/FRMS/).
// Will create directory and config if they don't exist.
func LoadConfig(filename string) (*viper.Viper, error) {

	config := viper.New()

	// default config dir
	path := fmt.Sprintf("%s/.config/FRMS", os.Getenv("HOME"))
	filetype := "yaml"

	// checking for existence
	if _, err := os.Stat(path); errors.Is(err, os.ErrNotExist) {
		if err := os.Mkdir(path, os.ModePerm); err != nil {
			return config, err
		}
	}

	logging.Debug(logging.DStart, "Loading config (%s)", filename)

	// setting config file info
	config.SetConfigName(filename)
	config.SetConfigType(filetype)
	config.AddConfigPath(path)

	config.AutomaticEnv()

	// reading in config
	if err := config.ReadInConfig(); err != nil {

		if _, ok := err.(viper.ConfigFileNotFoundError); ok {

			fullpath := fmt.Sprintf("%s/%s.%s", path, filename, filetype)
			logging.Debug(logging.DStart, "CON config does not exist!")
			if err = config.WriteConfigAs(fullpath); err != nil {
				return config, err
			}
			logging.Debug(logging.DStart, "CON created at %s", fullpath)
		} else {
			return config, err
		}
	}

	logging.Debug(logging.DStart, "CON Loaded configs from %v", config.ConfigFileUsed())

	return config, nil
}