import pytest

from infrasynth.notifications.channels.base import Attachment, BaseChannel
from infrasynth.notifications.channels.email_sendgrid import SendGridChannel
from infrasynth.notifications.channels.email_smtp import SMTPChannel
from infrasynth.notifications.channels.sms_twilio import TwilioSMSChannel
from infrasynth.notifications.channels.telegram import TelegramChannel


class TestBaseChannel:
    def test_is_abstract(self):
        with pytest.raises(TypeError):
            BaseChannel()

    def test_attachment_fields(self):
        attachment = Attachment("f.txt", b"data", "text/plain")
        assert attachment.filename == "f.txt"
        assert attachment.content == b"data"
        assert attachment.mime_type == "text/plain"
        assert attachment.cid is None
        assert attachment.inline is False


class TestSMTPChannel:
    def test_from_config_lowercases_keys(self):
        channel = SMTPChannel.from_config({"HOST": "smtp.example.com", "PORT": 2525, "USERNAME": "u"})
        assert channel.host == "smtp.example.com"
        assert channel.port == 2525
        assert channel.username == "u"

    def test_send_without_host_returns_err(self):
        channel = SMTPChannel()
        result = channel.send("a@b.com", "s", "b")
        assert result.is_err
        assert "SMTP host" in result.error

    def test_send_success_with_locmem_backend(self, settings):
        settings.EMAIL_BACKEND = "django.core.mail.backends.locmem.EmailBackend"
        channel = SMTPChannel.from_config(
            {"host": "smtp.example.com", "backend": "django.core.mail.backends.locmem.EmailBackend"}
        )
        result = channel.send("a@b.com", "Hello", "<b>Hi</b>", is_html=True)
        assert result.is_ok

    def test_send_success_with_attachment(self, settings):
        settings.EMAIL_BACKEND = "django.core.mail.backends.locmem.EmailBackend"
        channel = SMTPChannel.from_config(
            {"host": "smtp.example.com", "backend": "django.core.mail.backends.locmem.EmailBackend"}
        )
        attachment = Attachment("doc.pdf", b"%PDF", "application/pdf")
        result = channel.send("a@b.com", "Hello", "Hi", attachments=[attachment])
        assert result.is_ok

    def test_health_check(self):
        assert SMTPChannel.from_config({"host": "x"}).health_check() is True
        assert SMTPChannel().health_check() is False


class TestSendGridChannel:
    def test_send_without_key_returns_err(self):
        channel = SendGridChannel()
        result = channel.send("a@b.com", "s", "b")
        assert result.is_err
        assert "API key" in result.error

    def test_send_success(self):
        channel = SendGridChannel(api_key="sg-key")
        with __import__("unittest").mock.patch(
            "infrasynth.notifications.channels.email_sendgrid.requests.post"
        ) as post:
            post.return_value.status_code = 202
            post.return_value.text = "accepted"
            result = channel.send("a@b.com", "Hello", "World")
        assert result.is_ok
        payload = post.call_args.kwargs["json"]
        assert payload["personalizations"][0]["to"][0]["email"] == "a@b.com"
        assert payload["content"][0]["type"] == "text/html"
        assert payload["from"]["email"] == "noreply@example.com"

    def test_send_http_error_returns_err(self):
        channel = SendGridChannel(api_key="sg-key")
        with __import__("unittest").mock.patch(
            "infrasynth.notifications.channels.email_sendgrid.requests.post"
        ) as post:
            post.return_value.status_code = 401
            post.return_value.text = "unauthorized"
            result = channel.send("a@b.com", "Hello", "World")
        assert result.is_err
        assert "401" in result.error

    def test_send_request_exception_returns_err(self):
        import requests

        channel = SendGridChannel(api_key="sg-key")
        with __import__("unittest").mock.patch(
            "infrasynth.notifications.channels.email_sendgrid.requests.post",
            side_effect=requests.RequestException("timeout"),
        ):
            result = channel.send("a@b.com", "Hello", "World")
        assert result.is_err
        assert "timeout" in result.error

    def test_health_check(self):
        assert SendGridChannel(api_key="k").health_check() is True
        assert SendGridChannel().health_check() is False


class TestTwilioSMSChannel:
    def test_send_without_credentials_returns_err(self):
        channel = TwilioSMSChannel()
        result = channel.send("+573001234567", "s", "b")
        assert result.is_err
        assert "credentials" in result.error

    def test_send_success(self):
        channel = TwilioSMSChannel(account_sid="sid", auth_token="token", from_number="+15005550006")
        with __import__("unittest").mock.patch("infrasynth.notifications.channels.sms_twilio.Client") as client_cls:
            client = client_cls.return_value
            result = channel.send("+573001234567", "s", "Hello SMS")
        assert result.is_ok
        client.messages.create.assert_called_once_with(to="+573001234567", from_="+15005550006", body="Hello SMS")

    def test_send_twilio_error_returns_err(self):
        from twilio.base.exceptions import TwilioRestException

        channel = TwilioSMSChannel(account_sid="sid", auth_token="token", from_number="+15005550006")
        with __import__("unittest").mock.patch("infrasynth.notifications.channels.sms_twilio.Client") as client_cls:
            client_cls.return_value.messages.create.side_effect = TwilioRestException(
                400, "http://twilio", msg="Invalid number"
            )
            result = channel.send("+573001234567", "s", "Hello")
        assert result.is_err
        assert "400" in result.error

    def test_health_check(self):
        assert TwilioSMSChannel(account_sid="a", auth_token="b", from_number="c").health_check() is True
        assert TwilioSMSChannel().health_check() is False


class TestTelegramChannel:
    def test_send_without_token_returns_err(self):
        channel = TelegramChannel()
        result = channel.send("12345", "s", "b")
        assert result.is_err
        assert "bot token" in result.error

    def test_send_without_chat_id_returns_err(self):
        channel = TelegramChannel(bot_token="tok")
        result = channel.send("", "s", "b")
        assert result.is_err
        assert "chat_id" in result.error

    def test_send_success(self):
        from unittest import mock

        channel = TelegramChannel(bot_token="tok", chat_id="12345")
        with mock.patch("infrasynth.notifications.channels.telegram.requests.post") as post:
            post.return_value.json.return_value = {"ok": True}
            result = channel.send("", "Subject", "Hello")
        assert result.is_ok
        call_kwargs = post.call_args.kwargs
        assert "bot" not in str(call_kwargs["json"])

    def test_send_api_error_returns_err(self):
        from unittest import mock

        channel = TelegramChannel(bot_token="tok", chat_id="12345")
        with mock.patch("infrasynth.notifications.channels.telegram.requests.post") as post:
            post.return_value.json.return_value = {
                "ok": False,
                "description": "chat not found",
            }
            result = channel.send("", "Subject", "Hello")
        assert result.is_err
        assert "chat not found" in result.error

    def test_send_request_exception_returns_err(self):
        from unittest import mock

        import requests

        channel = TelegramChannel(bot_token="tok", chat_id="12345")
        with mock.patch(
            "infrasynth.notifications.channels.telegram.requests.post",
            side_effect=requests.RequestException("network"),
        ):
            result = channel.send("", "Subject", "Hello")
        assert result.is_err
        assert "network" in result.error

    def test_health_check(self):
        assert TelegramChannel(bot_token="k").health_check() is True
        assert TelegramChannel().health_check() is False