/* Copyright Martin Dosch
Licensed under the "MIT License" */

package main

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

func openConfig(configFilePtr *string) configuration {
	var (
		configFile string
		configPath string
	)
	if *configFilePtr != "none" {
		configFile = *configFilePtr
	} else {
		// Get systems user config path.
		osConfigDir := os.Getenv("$XDG_CONFIG_HOME")
		if osConfigDir != "" {
			// Create configPath if not yet existing.
			configPath = osConfigDir + "/.config/feed-to-muc/"
			if _, err := os.Stat(configPath); os.IsNotExist(err) {
				err = os.MkdirAll(configPath, 0o700)
				if err != nil {
					log.Fatal("Error: Can't create config path: ", err)
				}
			}

		} else { // Get the current user.
			curUser, err := user.Current()
			if err != nil {
				log.Fatal("Error: Can't get current user: ", err)
			}
			// Get home directory.
			home := curUser.HomeDir

			if home == "" {
				log.Fatal("Error: No home directory available.")
			}

			// Create configPath if not yet existing.
			configPath = home + "/.config/feed-to-muc/"
			if _, err := os.Stat(configPath + "config.json"); os.IsNotExist(err) {
				err = os.MkdirAll(configPath, 0o700)
				if err != nil {
					log.Fatal("Error: Can't create config path: ", err)
				}
			}

		}
		configFile = configPath + "config.json"
	}

	// Check that config file is existing.
	if _, err := os.Stat(configFile); os.IsNotExist(err) {
		log.Fatal("Error: Can't find config file: ", err)
	}

	// Read configuration file into variable config.
	file, _ := os.Open(configFile)
	defer file.Close()
	decoder := json.NewDecoder(file)
	config := configuration{}
	if err := decoder.Decode(&config); err != nil {
		log.Fatal("Error: Can't decode config: ", err)
	}

	if _, err := os.Stat(configFile); os.IsNotExist(err) {
		err = os.MkdirAll(configPath, 0o700)
		if err != nil {
			log.Fatal("Error: Can't create config path: ", err)
		}
	}
	return config
}