import unittest
from email.charset import Charset
from io import BytesIO

from twisted.internet import defer
from twisted.internet._sslverify import ClientTLSOptions

from scrapy.mail import MailSender


class MailSenderTest(unittest.TestCase):
    def test_send(self):
        mailsender = MailSender(debug=True)
        mailsender.send(
            to=["test@scrapy.org"],
            subject="subject",
            body="body",
            _callback=self._catch_mail_sent,
        )

        assert self.catched_msg

        self.assertEqual(self.catched_msg["to"], ["test@scrapy.org"])
        self.assertEqual(self.catched_msg["subject"], "subject")
        self.assertEqual(self.catched_msg["body"], "body")

        msg = self.catched_msg["msg"]
        self.assertEqual(msg["to"], "test@scrapy.org")
        self.assertEqual(msg["subject"], "subject")
        self.assertEqual(msg.get_payload(), "body")
        self.assertEqual(msg.get("Content-Type"), "text/plain")

    def test_send_single_values_to_and_cc(self):
        mailsender = MailSender(debug=True)
        mailsender.send(
            to="test@scrapy.org",
            subject="subject",
            body="body",
            cc="test@scrapy.org",
            _callback=self._catch_mail_sent,
        )

    def test_send_html(self):
        mailsender = MailSender(debug=True)
        mailsender.send(
            to=["test@scrapy.org"],
            subject="subject",
            body="<p>body</p>",
            mimetype="text/html",
            _callback=self._catch_mail_sent,
        )

        msg = self.catched_msg["msg"]
        self.assertEqual(msg.get_payload(), "<p>body</p>")
        self.assertEqual(msg.get("Content-Type"), "text/html")

    def test_send_attach(self):
        attach = BytesIO()
        attach.write(b"content")
        attach.seek(0)
        attachs = [("attachment", "text/plain", attach)]

        mailsender = MailSender(debug=True)
        mailsender.send(
            to=["test@scrapy.org"],
            subject="subject",
            body="body",
            attachs=attachs,
            _callback=self._catch_mail_sent,
        )

        assert self.catched_msg
        self.assertEqual(self.catched_msg["to"], ["test@scrapy.org"])
        self.assertEqual(self.catched_msg["subject"], "subject")
        self.assertEqual(self.catched_msg["body"], "body")

        msg = self.catched_msg["msg"]
        self.assertEqual(msg["to"], "test@scrapy.org")
        self.assertEqual(msg["subject"], "subject")

        payload = msg.get_payload()
        assert isinstance(payload, list)
        self.assertEqual(len(payload), 2)

        text, attach = payload
        self.assertEqual(text.get_payload(decode=True), b"body")
        self.assertEqual(text.get_charset(), Charset("us-ascii"))
        self.assertEqual(attach.get_payload(decode=True), b"content")

    def _catch_mail_sent(self, **kwargs):
        self.catched_msg = {**kwargs}

    def test_send_utf8(self):
        subject = "sübjèçt"
        body = "bödÿ-àéïöñß"
        mailsender = MailSender(debug=True)
        mailsender.send(
            to=["test@scrapy.org"],
            subject=subject,
            body=body,
            charset="utf-8",
            _callback=self._catch_mail_sent,
        )

        assert self.catched_msg
        self.assertEqual(self.catched_msg["subject"], subject)
        self.assertEqual(self.catched_msg["body"], body)

        msg = self.catched_msg["msg"]
        self.assertEqual(msg["subject"], subject)
        self.assertEqual(msg.get_payload(decode=True).decode("utf-8"), body)
        self.assertEqual(msg.get_charset(), Charset("utf-8"))
        self.assertEqual(msg.get("Content-Type"), 'text/plain; charset="utf-8"')

    def test_send_attach_utf8(self):
        subject = "sübjèçt"
        body = "bödÿ-àéïöñß"
        attach = BytesIO()
        attach.write(body.encode("utf-8"))
        attach.seek(0)
        attachs = [("attachment", "text/plain", attach)]

        mailsender = MailSender(debug=True)
        mailsender.send(
            to=["test@scrapy.org"],
            subject=subject,
            body=body,
            attachs=attachs,
            charset="utf-8",
            _callback=self._catch_mail_sent,
        )

        assert self.catched_msg
        self.assertEqual(self.catched_msg["subject"], subject)
        self.assertEqual(self.catched_msg["body"], body)

        msg = self.catched_msg["msg"]
        self.assertEqual(msg["subject"], subject)
        self.assertEqual(msg.get_charset(), Charset("utf-8"))
        self.assertEqual(msg.get("Content-Type"), 'multipart/mixed; charset="utf-8"')

        payload = msg.get_payload()
        assert isinstance(payload, list)
        self.assertEqual(len(payload), 2)

        text, attach = payload
        self.assertEqual(text.get_payload(decode=True).decode("utf-8"), body)
        self.assertEqual(text.get_charset(), Charset("utf-8"))
        self.assertEqual(attach.get_payload(decode=True).decode("utf-8"), body)

    def test_create_sender_factory_with_host(self):
        mailsender = MailSender(debug=False, smtphost="smtp.testhost.com")

        factory = mailsender._create_sender_factory(
            to_addrs=["test@scrapy.org"], msg="test", d=defer.Deferred()
        )

        context = factory.buildProtocol("test@scrapy.org").context
        self.assertIsInstance(context, ClientTLSOptions)