package config

import (
	"fmt"
	"os"
	"path/filepath"
	"regexp"
)

var validUUID = regexp.MustCompile("^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$")

// Read the configuration file
func Read(configFile string) (*FluckyConfig, error) {

	fc := &FluckyConfig{}

	f, err := os.Open(configFile)
	if err != nil {
		return nil, fmt.Errorf("Can not open file %v: %v", configFile, err)
	}
	defer f.Close()

	err = fc.JSONDecoder(f)
	if err != nil {
		return nil, fmt.Errorf("Can not decode json file %v: %v", configFile, err)
	}

	return fc, nil

}

// Write the configuration into a file, specified by the configuration filepath
func Write(cfg *FluckyConfig, configFile string) error {

	if _, err := os.Stat(configFile); os.IsNotExist(err) {
		configDir := filepath.Dir(configFile)
		err := os.MkdirAll(configDir, os.ModeDir)
		if err != nil {
			return fmt.Errorf("Can not create config directory %v: %v", configDir, err)
		}
	}

	f, err := os.Create(configFile)
	if err != nil {
		return fmt.Errorf("Can not write config file: %v", err)
	}
	defer f.Close()

	err = cfg.JSONWriter(f)
	if err != nil {
		return err
	}

	return nil

}