package main

import (
	"errors"
	"io"
	"os/exec"
	"runtime"

	c "git.tuxpa.in/a/gosora/common"
)

/*
   Sending emails in a way you really shouldn't be sending them.
   This method doesn't require a SMTP server, but has higher chances of an email being rejected or being seen as spam. Use at your own risk. Only for Linux as Windows doesn't have Sendmail.
*/
func init() {
    // Don't bother registering this plugin on platforms other than Linux
    if runtime.GOOS != "linux" {
        return
    }
    c.Plugins.Add(&c.Plugin{UName: "sendmail", Name: "Sendmail", Author: "Azareal", URL: "http://github.com/Azareal", Tag: "Linux Only", Init: initSendmail, Activate: activateSendmail, Deactivate: deactivateSendmail})
}

func initSendmail(plugin *c.Plugin) error {
    plugin.AddHook("email_send_intercept", sendSendmail)
    return nil
}

// /usr/sbin/sendmail is only available on Linux
func activateSendmail(plugin *c.Plugin) error {
    if !c.Site.EnableEmails {
        return errors.New("You have emails disabled in your configuration file")
    }
    if runtime.GOOS != "linux" {
        return errors.New("This plugin only supports Linux")
    }
    return nil
}

func deactivateSendmail(plugin *c.Plugin) {
    plugin.RemoveHook("email_send_intercept", sendSendmail)
}

func sendSendmail(data ...interface{}) interface{} {
    to := data[0].(string)
    subject := data[1].(string)
    body := data[2].(string)

    msg := "From: " + c.Site.Email + "\n"
    msg += "To: " + to + "\n"
    msg += "Subject: " + subject + "\n\n"
    msg += body + "\n"

    sendmail := exec.Command("/usr/sbin/sendmail", "-t", "-i")
    stdin, err := sendmail.StdinPipe()
    if err != nil {
        return err // Possibly disable the plugin and show an error to the admin on the dashboard? Plugin log file?
    }

    err = sendmail.Start()
    if err != nil {
        return err
    }
    io.WriteString(stdin, msg)

    err = stdin.Close()
    if err != nil {
        return err
    }
    return sendmail.Wait()
}