package main

import (
	"encoding/json"
	"errors"
	"os"
)

const configPath = "config.json"

type config struct {
	Port      int    `json:"port"`
	ThemeName string `json:"theme"`
}

// createDefaultConfig checks if a config file is present. If not, it creates the default config file.
// It returns true if a file is created.
func createDefaultConfig() (bool, error) {
	info, err := os.Stat(configPath)
	if err == nil {
		if info.IsDir() {
			return false, errors.New("config.json is a directory")
		}
		return false, nil
	}
	if !os.IsNotExist(err) {
		return false, err
	}

	// Create the file.
	f, err := os.Create(configPath)
	if err != nil {
		return false, err
	}
	encoder := json.NewEncoder(f)
	encoder.SetIndent("", "\t")
	err = encoder.Encode(config{
		Port:      80,
		ThemeName: "default",
	})
	return true, err
}

// parseConfig parses the config file into a struct
func parseConfig() (config, error) {
	// Open the file.
	f, err := os.Open(configPath)
	if err != nil {
		return config{}, err
	}
	defer f.Close()
	// Decode it into the config struct.
	var cfg config
	err = json.NewDecoder(f).Decode(&cfg)
	return cfg, err
}