package config

import (
	"encoding/json"
	"fmt"
	"log"
	"os"
)

// Config contains the basic configuration information.
type Config struct {
	Port     int    `json:"port"`
	LogLevel string `json:"logLevel"`
	Name     string `json:"name"`
	Matrix   struct {
		Homeserver string `json:"homeserver"`
		Port       int    `json:"port"`
	} `json:"matrix"`
}

//GetConfig gets the configuration values for the api using the file in the supplied configPath.
func GetConfig(configPath string) (Config, error) {
	if _, err := os.Stat(configPath); os.IsNotExist(err) {
		return Config{}, fmt.Errorf("could not find the config file at path %s", configPath)
	}
	log.Println("Loading Configuration File: " + configPath)
	return loadConfigFromFile(configPath)
}

//if the config loaded from the file errors, no defaults will be loaded and the app will exit.
func loadConfigFromFile(configPath string) (conf Config, err error) {
	file, err := os.Open(configPath)
	if err != nil {
		log.Printf("Error opening config file: %v", err)
	} else {
		defer file.Close()

		err = json.NewDecoder(file).Decode(&conf)
		if err != nil {
			log.Printf("Error decoding config file: %v", err)
		}
	}

	return conf, err
}