package main

import (
	"bytes"
    "fmt"
	"html/template"
	"io"
	"os"
    "encoding/csv"
    "strconv"

	"gopkg.in/gomail.v2"
)

type Customer struct {
    Name string
    email string
    Anrede string
    gender int
}
type MailList struct {
    customers []Customer
}

var list []Customer
var filename string = "testlist.csv"

func init() {
    //cryptexample()
    fmt.Println("  Starting MassMailer\n ##################################\n")
    initConf()

    file, err := os.Open(config.Massmail.Listfile)
    if err != nil {
        panic(err)
    }else{
        fmt.Println("\n",config.Massmail.Listfile, "opened Successfully!")
    }
    defer file.Close()

    reader := csv.NewReader(file)
    reader.Comma = ';'
    lineCount := 0



    for {
        line , erro := reader.Read()
        if erro == io.EOF {
            break
        }else if erro != nil {
            panic(erro)
        }
        gen, err := strconv.Atoi(line[2])
        if err != nil {
            panic(err)
        }
        anrede := config.Massmail.Anrede[(gen+1)]
        cn := Customer{Name: line[0], email: line[1], Anrede: anrede, gender: gen}
        list = append(list, cn)
        fmt.Println(cn)
        lineCount += 1
    }
    fmt.Println("\n All Customers:",lineCount)
}

func main() {
    if isSure("Send the Mail to all Customers?"){
        for _ , c := range list{
            err := SendMail(c)
            if err==nil{
                fmt.Println("Sending Mail to",c.Anrede,c.Name,"Done Successful")
            }else{
                panic(err)
            }
        }
    }else{
        fmt.Println(" ok... bye then!")
    }
}

func SendMail(cust Customer) error {
    t, err := template.ParseFiles(config.Massmail.Mailfile)
    if err != nil {
        return err
    }
    buf := new(bytes.Buffer)
    err = t.Execute(buf, cust)
    if err != nil {
        return err
    }
    pass := Decrypt(config.Mailacc.Accountpwd)

    m := gomail.NewMessage()
	m.SetHeader("From", m.FormatAddress(config.Mailacc.Address , config.Mailacc.Name))
	m.SetHeader("To", cust.email)
	//m.SetAddressHeader("Cc", "test@mail.com", "Dan")
	m.SetHeader("Subject", config.Massmail.Subject)
	m.SetBody("text/html", buf.String())
	//m.Attach("someimage.jpg", gomail.Rename("logo.jpg"))
	m.Embed(config.Massmail.Bannerfile)

	d := gomail.NewDialer(config.Mailacc.Smtpurl, config.Mailacc.Port, config.Mailacc.Accountname, pass)

	// Send the email to Bob, Cora and Dan.
	if err := d.DialAndSend(m); err != nil {
		fmt.Println("Connecting to Email Server Failed! Check your Accountname and Password\nError:")
        panic(err)
	}
    return nil
}