"""Tests for create_pr.py.

Every test mocks `get_credentials` and `urllib.request.urlopen` so no real
network calls or keychain access are performed.
"""
import io
import json
import sys
import unittest
from unittest.mock import MagicMock, patch

sys.path.insert(0, str(__import__("pathlib").Path(__file__).resolve().parent.parent))
import create_pr  # noqa: E402


FAKE_CREDS = ("testuser", "testpass")


def _mock_urlopen(body=None):
    if body is None:
        body = {"number": 99, "html_url": "https://gitea.example.com/pulls/99"}
    resp = MagicMock()
    resp.read.return_value = json.dumps(body).encode("utf-8")
    resp.__enter__ = lambda s: s
    resp.__exit__ = MagicMock(return_value=False)
    return resp


# ---------------------------------------------------------------------------
# Argument parsing
# ---------------------------------------------------------------------------
class TestArgParsing(unittest.TestCase):

    @patch("create_pr.urllib.request.urlopen", return_value=_mock_urlopen())
    @patch("create_pr.get_credentials", return_value=FAKE_CREDS)
    def test_minimal_required_args(self, _cred, _url):
        rc = create_pr.main(["--title", "PR Title", "--head", "feat/branch"])
        self.assertEqual(rc, 0)

    def test_missing_title_exits(self):
        with self.assertRaises(SystemExit):
            create_pr.main(["--head", "feat/branch"])

    def test_missing_head_exits(self):
        with self.assertRaises(SystemExit):
            create_pr.main(["--title", "PR Title"])

    def test_invalid_remote_exits(self):
        with self.assertRaises(SystemExit):
            create_pr.main(["--remote", "nope", "--title", "T", "--head", "h"])


# ---------------------------------------------------------------------------
# Remote resolution
# ---------------------------------------------------------------------------
class TestRemoteResolution(unittest.TestCase):

    @patch("create_pr.urllib.request.urlopen", return_value=_mock_urlopen())
    @patch("create_pr.get_credentials", return_value=FAKE_CREDS)
    def test_default_dadeschools(self, mock_cred, _url):
        create_pr.main(["--title", "T", "--head", "h"])
        mock_cred.assert_called_with("gitea.dadeschools.net")

    @patch("create_pr.urllib.request.urlopen", return_value=_mock_urlopen())
    @patch("create_pr.get_credentials", return_value=FAKE_CREDS)
    def test_prgs_remote(self, mock_cred, _url):
        create_pr.main(["--remote", "prgs", "--title", "T", "--head", "h"])
        mock_cred.assert_called_with("gitea.prgs.cc")


# ---------------------------------------------------------------------------
# API payload
# ---------------------------------------------------------------------------
class TestAPIPayload(unittest.TestCase):

    @patch("create_pr.get_credentials", return_value=FAKE_CREDS)
    def test_payload_fields(self, _cred):
        with patch("create_pr.urllib.request.Request") as MockReq:
            MockReq.return_value = MagicMock()
            with patch("create_pr.urllib.request.urlopen",
                       return_value=_mock_urlopen()):
                create_pr.main([
                    "--title", "My PR",
                    "--head", "feat/x",
                    "--base", "develop",
                    "--body", "Closes #1",
                ])
            data = json.loads(MockReq.call_args[1]["data"].decode("utf-8"))
            self.assertEqual(data["title"], "My PR")
            self.assertEqual(data["head"], "feat/x")
            self.assertEqual(data["base"], "develop")
            self.assertEqual(data["body"], "Closes #1")

    @patch("create_pr.get_credentials", return_value=FAKE_CREDS)
    def test_default_base_is_main(self, _cred):
        with patch("create_pr.urllib.request.Request") as MockReq:
            MockReq.return_value = MagicMock()
            with patch("create_pr.urllib.request.urlopen",
                       return_value=_mock_urlopen()):
                create_pr.main(["--title", "T", "--head", "h"])
            data = json.loads(MockReq.call_args[1]["data"].decode("utf-8"))
            self.assertEqual(data["base"], "main")

    @patch("create_pr.get_credentials", return_value=FAKE_CREDS)
    def test_url_prgs(self, _cred):
        with patch("create_pr.urllib.request.Request") as MockReq:
            MockReq.return_value = MagicMock()
            with patch("create_pr.urllib.request.urlopen",
                       return_value=_mock_urlopen()):
                create_pr.main(["--remote", "prgs", "--title", "T", "--head", "h"])
            url = MockReq.call_args[0][0]
            self.assertEqual(
                url,
                "https://gitea.prgs.cc/api/v1/repos/Scaled-Tech-Consulting/Timesheet/pulls",
            )


# ---------------------------------------------------------------------------
# Auth failure
# ---------------------------------------------------------------------------
class TestAuthFailure(unittest.TestCase):

    @patch("create_pr.get_credentials", return_value=("", ""))
    def test_no_credentials_returns_1(self, _cred):
        rc = create_pr.main(["--title", "T", "--head", "h"])
        self.assertEqual(rc, 1)


# ---------------------------------------------------------------------------
# HTTP error
# ---------------------------------------------------------------------------
class TestHTTPError(unittest.TestCase):

    @patch("create_pr.get_credentials", return_value=FAKE_CREDS)
    def test_422_returns_1(self, _cred):
        import urllib.error
        err = urllib.error.HTTPError(
            url="https://example.com", code=422, msg="Unprocessable",
            hdrs=None, fp=io.BytesIO(b'{"message":"branch not found"}'),
        )
        with patch("create_pr.urllib.request.urlopen", side_effect=err):
            rc = create_pr.main(["--title", "T", "--head", "h"])
            self.assertEqual(rc, 1)


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