package main

import (
	"flag"
	"io"
	"io/ioutil"
	"os"

	"github.com/mauleyzaola/glog"
)

import (
	"fmt"
	"os/exec"
	"strings"
)

func main() {
	flag.Parse()

	if isFromStdIn() {
		data, err := readStdIn(os.Stdin)
		if err != nil {
			glog.Error(err)
			return
		}
		if len(data) == 0 {
			fmt.Println("nothing from stdin")
			return
		}
		lines := parseLines(string(data))
		for _, v := range lines {
			so, ta, err := parseLine(v)
			if so == nil {
				break
			}
			if err != nil {
				glog.Error(err)
				return
			}
			if err = execute(so, ta); err != nil {
				glog.Error(err)
				return
			}
		}
	} else {
		fmt.Println("invalid or empty stdin pipe")
		return
	}

}

func parseLines(data string) []string {
	return strings.Split(data, "\n")
}

func parseLine(line string) (so, ta *mail, err error) {
	values := strings.Split(line, ";")
	if len(values) <= 1 {
		return
	}

	if len(values) != 6 {
		return nil, nil, fmt.Errorf("wrong line:%s", line)
	}
	so = &mail{
		host:     values[0],
		user:     values[1],
		password: values[2],
	}
	ta = &mail{
		host:     values[3],
		user:     values[4],
		password: values[5],
	}
	return
}

type mail struct {
	host, user, password string
}

func execute(s, t *mail) error {
	var args []string
	args = append(args, "--host1")
	args = append(args, s.host)
	args = append(args, "--user1")
	args = append(args, s.user)
	args = append(args, "--password1")
	args = append(args, s.password)
	args = append(args, "--host2")
	args = append(args, t.host)
	args = append(args, "--user2")
	args = append(args, t.user)
	args = append(args, "--password2")
	args = append(args, t.password)

	args = append(args, "--automap")
	args = append(args, "--tls2")
	//	args = append(args, "--exclude \"(?i)spam\"")

	cmd := exec.Command("imapsync", args...)
	data, err := cmd.CombinedOutput()
	if len(data) != 0 {
		fmt.Println(string(data))
	}
	return err
}

func isFromStdIn() bool {
	stat, _ := os.Stdin.Stat()
	return (stat.Mode() & os.ModeCharDevice) == 0
}

func readStdIn(reader io.Reader) ([]byte, error) {
	return ioutil.ReadAll(reader)
}