package config

import (
	"fmt"
	"io"
	"io/ioutil"
	"os"
	"os/exec"
	"strings"

	"launchpad.net/goyaml"
)

type Config struct {
	SuspendCmd, LockCmd       string
	NoXSuspendCmd, NoXLockCmd string
}

func (c *Config) Suspend() (err error) {
	var args []string
	if len(os.Getenv("DISPLAY")) > 0 {
		args = strings.Split(c.SuspendCmd, " ")
	} else {
		args = strings.Split(c.NoXSuspendCmd, " ")
	}
	cmd := exec.Command(args[0], args[1:]...)
	stdout, err := cmd.StdoutPipe()
	if err != nil {
		fmt.Println(err)
	}
	stderr, err := cmd.StderrPipe()
	if err != nil {
		fmt.Println(err)
	}

	go io.Copy(os.Stdout, stdout)
	go io.Copy(os.Stderr, stderr)

	err = cmd.Run()
	return
}

func (c *Config) Lock() (err error) {
	var args []string
	if len(os.Getenv("DISPLAY")) > 0 {
		args = strings.Split(c.LockCmd, " ")
	} else {
		args = strings.Split(c.NoXLockCmd, " ")
	}
	cmd := exec.Command(args[0], args[1:]...)
	stdout, err := cmd.StdoutPipe()
	if err != nil {
		fmt.Println(err)
	}
	stderr, err := cmd.StderrPipe()
	if err != nil {
		fmt.Println(err)
	}

	go io.Copy(os.Stdout, stdout)
	go io.Copy(os.Stderr, stderr)

	err = cmd.Run()
	return
}

func ReadConfig(filename string) (c *Config, err error) {
	file, err := os.Open(filename)
	if err != nil {
		return nil, err
	}

	b, err := ioutil.ReadAll(file)
	if err != nil {
		return nil, err
	}

	c = &Config{}
	err = goyaml.Unmarshal(b, c)
	if err != nil {
		return nil, err
	}

	return c, nil
}