#!/usr/bin/env python3
# -*- coding: utf-8 -*-

# Copyright 2020 The ChromiumOS Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Tests for email_sender."""


import contextlib
import io
import json
import unittest
import unittest.mock as mock

import cros_utils.email_sender as email_sender


class Test(unittest.TestCase):
    """Tests for email_sender."""

    @mock.patch("cros_utils.email_sender.AtomicallyWriteFile")
    def test_x20_email_sending_rejects_invalid_inputs(self, write_file):
        test_cases = [
            {
                # no subject
                "subject": "",
                "identifier": "foo",
                "direct_recipients": ["gbiv@google.com"],
                "text_body": "hi",
            },
            {
                "subject": "foo",
                # no identifier
                "identifier": "",
                "direct_recipients": ["gbiv@google.com"],
                "text_body": "hi",
            },
            {
                "subject": "foo",
                "identifier": "foo",
                # no recipients
                "direct_recipients": [],
                "text_body": "hi",
            },
            {
                "subject": "foo",
                "identifier": "foo",
                "direct_recipients": ["gbiv@google.com"],
                # no body
            },
            {
                "subject": "foo",
                "identifier": "foo",
                # direct recipients lack @google.
                "direct_recipients": ["gbiv"],
                "text_body": "hi",
            },
            {
                "subject": "foo",
                "identifier": "foo",
                # non-list recipients
                "direct_recipients": "gbiv@google.com",
                "text_body": "hi",
            },
            {
                "subject": "foo",
                "identifier": "foo",
                # non-list recipients
                "well_known_recipients": "detective",
                "text_body": "hi",
            },
        ]

        sender = email_sender.EmailSender()
        for case in test_cases:
            with self.assertRaises(ValueError):
                sender.SendX20Email(**case)

        write_file.assert_not_called()

    @mock.patch("cros_utils.email_sender.AtomicallyWriteFile")
    def test_x20_email_sending_translates_to_reasonable_json(self, write_file):
        written_obj = None

        @contextlib.contextmanager
        def actual_write_file(file_path):
            nonlocal written_obj

            self.assertTrue(
                file_path.startswith(email_sender.X20_PATH + "/"), file_path
            )
            f = io.StringIO()
            yield f
            written_obj = json.loads(f.getvalue())

        write_file.side_effect = actual_write_file
        email_sender.EmailSender().SendX20Email(
            subject="hello",
            identifier="world",
            well_known_recipients=["detective"],
            direct_recipients=["gbiv@google.com"],
            text_body="text",
            html_body="html",
        )

        self.assertEqual(
            written_obj,
            {
                "subject": "hello",
                "email_identifier": "world",
                "well_known_recipients": ["detective"],
                "direct_recipients": ["gbiv@google.com"],
                "body": "text",
                "html_body": "html",
            },
        )


if __name__ == "__main__":
    unittest.main()