package main

import (
	"flag"
	"fmt"
	"log"
	"os"
	"time"

	"git.0cd.xyz/michael/gomail/mail"
)

func main() {
	cfgFile, mailbox, msgs := ui()
	cfg := NewConfig(*cfgFile)
	chErr, chDone := make(chan error), make(chan bool)
	for _, account := range cfg.Account {
		go func(addr, username, password string, chErr chan<- error, chDone chan<- bool) {
			defer func() {
				chDone <- true
			}()
			conn, err := mail.Login(addr, username, password)
			if err != nil {
				chErr <- err
			}
			defer conn.Client.Logout()
			messages, err := conn.GetMessages(*mailbox, int32(*msgs))
			if err != nil {
				chErr <- err
			}
			path := cfg.Path + username + "/" + time.Now().Format("2006-01-02-15:04:05")
			for _, p := range []string{cfg.Path + username, path} {
				if _, err := os.Stat(p); os.IsNotExist(err) {
					os.Mkdir(p, 0775)
				}
			}
			if err := mail.WriteMessages(path, messages); err != nil {
				chErr <- err
			}
		}(account.Addr, account.Username, account.Password, chErr, chDone)
	}
	for c := 0; c < len(cfg.Account); {
		select {
		case err := <-chErr:
			log.Println(err)
		case <-chDone:
			c++
		}
	}
}

func ui() (cfgFile, mailbox *string, msgs *int) {
	flag.Usage = func() {
		fmt.Printf("Usage of %s:\n", os.Args[0])
		flag.PrintDefaults()
	}
	home, err := os.UserHomeDir()
	if err != nil {
		log.Fatal(err)
	}
	cfgFile = flag.String("cfgFile", home+"/.config/gomail/config.yaml", "path to config file")
	mailbox = flag.String("mailbox", "inbox", "mailbox to scan messages")
	msgs = flag.Int("msgs", 100, "Number of messages to pull")

	flag.Parse()
	return cfgFile, mailbox, msgs
}