import os
import shutil
from contextlib import contextmanager
from subprocess import PIPE, Popen
from tempfile import mkdtemp
from unittest import TestCase, mock

from .matrix_bridge import check_zulip_message_validity, zulip_to_matrix

script_file = "matrix_bridge.py"
script_dir = os.path.dirname(__file__)
script = os.path.join(script_dir, script_file)

from typing import Iterator, List

sample_config_path = "matrix_test.conf"

sample_config_text = """[matrix]
host = https://matrix.org
username = @username@matrix.org
password = password
room_id = #zulip:matrix.org

[zulip]
email = glitch-bot@chat.zulip.org
api_key = aPiKeY
site = https://chat.zulip.org
stream = test here
topic = matrix

"""


@contextmanager
def new_temp_dir() -> Iterator[str]:
    path = mkdtemp()
    yield path
    shutil.rmtree(path)


class MatrixBridgeScriptTests(TestCase):
    def output_from_script(self, options: List[str]) -> List[str]:
        popen = Popen(
            ["python", script] + options, stdin=PIPE, stdout=PIPE, universal_newlines=True
        )
        return popen.communicate()[0].strip().split("\n")

    def test_no_args(self) -> None:
        output_lines = self.output_from_script([])
        expected_lines = [
            "Options required: -c or --config to run, OR --write-sample-config.",
            f"usage: {script_file} [-h]",
        ]
        for expected, output in zip(expected_lines, output_lines):
            self.assertIn(expected, output)

    def test_help_usage_and_description(self) -> None:
        output_lines = self.output_from_script(["-h"])
        usage = f"usage: {script_file} [-h]"
        description = "Script to bridge"
        self.assertIn(usage, output_lines[0])
        blank_lines = [num for num, line in enumerate(output_lines) if line == ""]
        # There should be blank lines in the output
        self.assertTrue(blank_lines)
        # There should be finite output
        self.assertTrue(len(output_lines) > blank_lines[0])
        # Minimal description should be in the first line of the 2nd "paragraph"
        self.assertIn(description, output_lines[blank_lines[0] + 1])

    def test_write_sample_config(self) -> None:
        with new_temp_dir() as tempdir:
            path = os.path.join(tempdir, sample_config_path)
            output_lines = self.output_from_script(["--write-sample-config", path])
            self.assertEqual(output_lines, [f"Wrote sample configuration to '{path}'"])

            with open(path) as sample_file:
                self.assertEqual(sample_file.read(), sample_config_text)

    def test_write_sample_config_from_zuliprc(self) -> None:
        zuliprc_template = ["[api]", "email={email}", "key={key}", "site={site}"]
        zulip_params = {
            "email": "foo@bar",
            "key": "some_api_key",
            "site": "https://some.chat.serverplace",
        }
        with new_temp_dir() as tempdir:
            path = os.path.join(tempdir, sample_config_path)
            zuliprc_path = os.path.join(tempdir, "zuliprc")
            with open(zuliprc_path, "w") as zuliprc_file:
                zuliprc_file.write("\n".join(zuliprc_template).format(**zulip_params))
            output_lines = self.output_from_script(
                ["--write-sample-config", path, "--from-zuliprc", zuliprc_path]
            )
            self.assertEqual(
                output_lines,
                [
                    "Wrote sample configuration to '{}' using zuliprc file '{}'".format(
                        path, zuliprc_path
                    )
                ],
            )

            with open(path) as sample_file:
                sample_lines = [line.strip() for line in sample_file.readlines()]
                expected_lines = sample_config_text.split("\n")
                expected_lines[7] = "email = {}".format(zulip_params["email"])
                expected_lines[8] = "api_key = {}".format(zulip_params["key"])
                expected_lines[9] = "site = {}".format(zulip_params["site"])
                self.assertEqual(sample_lines, expected_lines[:-1])

    def test_detect_zuliprc_does_not_exist(self) -> None:
        with new_temp_dir() as tempdir:
            path = os.path.join(tempdir, sample_config_path)
            zuliprc_path = os.path.join(tempdir, "zuliprc")
            # No writing of zuliprc file here -> triggers check for zuliprc absence
            output_lines = self.output_from_script(
                ["--write-sample-config", path, "--from-zuliprc", zuliprc_path]
            )
            self.assertEqual(
                output_lines,
                [
                    "Could not write sample config: Zuliprc file '{}' does not exist.".format(
                        zuliprc_path
                    )
                ],
            )


class MatrixBridgeZulipToMatrixTests(TestCase):
    valid_zulip_config = dict(stream="some stream", topic="some topic", email="some@email")
    valid_msg = dict(
        sender_email="John@Smith.smith",  # must not be equal to config:email
        type="stream",  # Can only mirror Zulip streams
        display_recipient=valid_zulip_config["stream"],
        subject=valid_zulip_config["topic"],
    )

    def test_zulip_message_validity_success(self) -> None:
        zulip_config = self.valid_zulip_config
        msg = self.valid_msg
        # Ensure the test inputs are valid for success
        assert msg["sender_email"] != zulip_config["email"]

        self.assertTrue(check_zulip_message_validity(msg, zulip_config))

    def test_zulip_message_validity_failure(self) -> None:
        zulip_config = self.valid_zulip_config

        msg_wrong_stream = dict(self.valid_msg, display_recipient="foo")
        self.assertFalse(check_zulip_message_validity(msg_wrong_stream, zulip_config))

        msg_wrong_topic = dict(self.valid_msg, subject="foo")
        self.assertFalse(check_zulip_message_validity(msg_wrong_topic, zulip_config))

        msg_not_stream = dict(self.valid_msg, type="private")
        self.assertFalse(check_zulip_message_validity(msg_not_stream, zulip_config))

        msg_from_bot = dict(self.valid_msg, sender_email=zulip_config["email"])
        self.assertFalse(check_zulip_message_validity(msg_from_bot, zulip_config))

    def test_zulip_to_matrix(self) -> None:
        room = mock.MagicMock()
        zulip_config = self.valid_zulip_config
        send_msg = zulip_to_matrix(zulip_config, room)

        msg = dict(self.valid_msg, sender_full_name="John Smith")

        expected = {
            "hi": "{} hi",
            "*hi*": "{} *hi*",
            "**hi**": "{} **hi**",
        }

        for content in expected:
            send_msg(dict(msg, content=content))

        for (method, params, _), expect in zip(room.method_calls, expected.values()):
            self.assertEqual(method, "send_text")
            self.assertEqual(params[0], expect.format("<JohnSmith>"))