"""Unit tests for scripts/ci/validate_commit_msg.py."""

import os
import subprocess
import tempfile
from unittest.mock import MagicMock, patch

from click.testing import CliRunner

from devx.ci.validate_commit_msg import first_line, get_branch, get_latest_commit_msg, main
from devx.config import CONVENTIONAL_RE, TASK_ID_RE


class TestHelpers:
    def test_first_line_single(self) -> None:
        assert first_line("feat: add something") == "feat: add something"

    def test_first_line_multiline(self) -> None:
        msg = "feat: add something\n\nBody text here.\nMore body."
        assert first_line(msg) == "feat: add something"

    def test_conventional_re_matches_valid(self) -> None:
        assert CONVENTIONAL_RE.match("feat: add feature")
        assert CONVENTIONAL_RE.match("fix: bug fix")
        assert CONVENTIONAL_RE.match("chore: update deps")
        assert CONVENTIONAL_RE.match("docs: update readme")
        assert CONVENTIONAL_RE.match("style: format code")
        assert CONVENTIONAL_RE.match("refactor: simplify")
        assert CONVENTIONAL_RE.match("perf: speed up")
        assert CONVENTIONAL_RE.match("test: add tests")
        assert CONVENTIONAL_RE.match("ci: update workflow")
        assert CONVENTIONAL_RE.match("build: update deps")
        assert CONVENTIONAL_RE.match("revert: undo change")

    def test_conventional_re_allows_scope(self) -> None:
        assert CONVENTIONAL_RE.match("feat(cli): add --url option")
        assert CONVENTIONAL_RE.match("fix(api): handle timeout")

    def test_conventional_re_rejects_invalid(self) -> None:
        assert not CONVENTIONAL_RE.match("DEVX-19: feat: something")
        assert not CONVENTIONAL_RE.match("random message")
        assert not CONVENTIONAL_RE.match("feat:")
        assert not CONVENTIONAL_RE.match(": description")

    def test_task_id_re_matches(self) -> None:
        assert TASK_ID_RE.match("DEVX-19: feat: something")
        assert TASK_ID_RE.match("DEVX-123: fix: bug")

    def test_task_id_re_rejects(self) -> None:
        assert not TASK_ID_RE.match("feat: something")
        assert not TASK_ID_RE.match("GRM: something")


class TestGetBranch:
    def test_returns_branch_name(self) -> None:
        with patch("subprocess.run") as mock_run:
            mock_run.return_value.stdout = "feature-branch\n"
            mock_run.return_value.returncode = 0
            assert get_branch() == "feature-branch"

    def test_returns_empty_on_error(self) -> None:
        with patch("subprocess.run", side_effect=subprocess.CalledProcessError(1, "git")):
            assert get_branch() == ""


class TestMain:
    def _write_msg(self, content: str) -> str:
        fd, path = tempfile.mkstemp()
        with os.fdopen(fd, "w") as f:
            f.write(content)
        return path

    @patch("devx.ci.validate_commit_msg.get_latest_commit_msg")
    def test_rejects_task_id_on_feature_branch(self, mock_commit: MagicMock) -> None:
        msg_path = self._write_msg("DEVX-19: feat: add feature")
        with patch("devx.ci.validate_commit_msg.get_branch", return_value="DEVX-19"):
            runner = CliRunner()
            result = runner.invoke(main, [msg_path])
            assert result.exit_code == 1
            assert "task ID" in result.output

    @patch("devx.ci.validate_commit_msg.get_latest_commit_msg")
    def test_accepts_conventional_on_feature_branch(self, mock_commit: MagicMock) -> None:
        msg_path = self._write_msg("feat: add feature")
        with patch("devx.ci.validate_commit_msg.get_branch", return_value="DEVX-19"):
            runner = CliRunner()
            result = runner.invoke(main, [msg_path])
            assert result.exit_code == 0

    @patch("devx.ci.validate_commit_msg.get_latest_commit_msg")
    def test_accepts_valid_master_commit(self, mock_commit: MagicMock) -> None:
        msg_path = self._write_msg("DEVX-19: feat: add feature")
        with patch("devx.ci.validate_commit_msg.get_branch", return_value="master"):
            runner = CliRunner()
            result = runner.invoke(main, [msg_path])
            assert result.exit_code == 0

    @patch("devx.ci.validate_commit_msg.get_latest_commit_msg")
    def test_rejects_master_without_task_id(self, mock_commit: MagicMock) -> None:
        msg_path = self._write_msg("feat: add feature")
        with patch("devx.ci.validate_commit_msg.get_branch", return_value="master"):
            runner = CliRunner()
            result = runner.invoke(main, [msg_path])
            assert result.exit_code == 1
            assert "task ID" in result.output

    @patch("devx.ci.validate_commit_msg.get_latest_commit_msg")
    def test_rejects_master_with_non_conventional_after_task_id(self, mock_commit: MagicMock) -> None:
        msg_path = self._write_msg("DEVX-19: random message")
        with patch("devx.ci.validate_commit_msg.get_branch", return_value="master"):
            runner = CliRunner()
            result = runner.invoke(main, [msg_path])
            assert result.exit_code == 1
            assert "conventional" in result.output

    @patch("devx.ci.validate_commit_msg.get_latest_commit_msg")
    def test_rejects_non_conventional_on_feature_branch(self, mock_commit: MagicMock) -> None:
        msg_path = self._write_msg("random message")
        with patch("devx.ci.validate_commit_msg.get_branch", return_value="feature"):
            runner = CliRunner()
            result = runner.invoke(main, [msg_path])
            assert result.exit_code == 1
            assert "conventional" in result.output

    @patch("devx.ci.validate_commit_msg.get_latest_commit_msg")
    def test_accepts_multiline_conventional(self, mock_commit: MagicMock) -> None:
        msg_path = self._write_msg("feat: add feature\n\nBody text.\nMore text.")
        with patch("devx.ci.validate_commit_msg.get_branch", return_value="feature"):
            runner = CliRunner()
            result = runner.invoke(main, [msg_path])
            assert result.exit_code == 0

    @patch("devx.ci.validate_commit_msg.get_branch")
    @patch("devx.ci.validate_commit_msg.get_latest_commit_msg")
    def test_usage_message_without_args(self, mock_commit: MagicMock, mock_branch: MagicMock) -> None:
        runner = CliRunner()
        result = runner.invoke(main, [])
        assert result.exit_code != 0

    @patch("devx.ci.validate_commit_msg.get_branch")
    @patch("devx.ci.validate_commit_msg.get_latest_commit_msg")
    def test_branch_override_accepts_master_commit(self, mock_commit: MagicMock, mock_branch: MagicMock) -> None:
        """--branch master overrides branch detection (for CI use)."""
        msg_path = self._write_msg("DEVX-19: feat: add feature")
        runner = CliRunner()
        result = runner.invoke(main, [msg_path, "--branch", "master"])
        assert result.exit_code == 0

    @patch("devx.ci.validate_commit_msg.get_branch")
    @patch("devx.ci.validate_commit_msg.get_latest_commit_msg")
    def test_branch_override_rejects_missing_task_id(self, mock_commit: MagicMock, mock_branch: MagicMock) -> None:
        """--branch master still enforces DEVX-N: prefix."""
        msg_path = self._write_msg("feat: add feature")
        runner = CliRunner()
        result = runner.invoke(main, [msg_path, "--branch", "master"])
        assert result.exit_code == 1
        assert "task ID" in result.output

    @patch("devx.ci.validate_commit_msg.get_branch")
    @patch("devx.ci.validate_commit_msg.get_latest_commit_msg")
    def test_branch_override_feature_accepts_conventional(self, mock_commit: MagicMock, mock_branch: MagicMock) -> None:
        """--branch feature still rejects DEVX-N prefix."""
        msg_path = self._write_msg("DEVX-19: feat: add feature")
        runner = CliRunner()
        result = runner.invoke(main, [msg_path, "--branch", "feature"])
        assert result.exit_code == 1
        assert "task ID" in result.output


class TestCustomPrefix:
    """Tests for custom task ID prefix (e.g., GRM-N instead of DEVX-N).

    The prefix is configured via the DEVX_TASK_PREFIX environment variable.
    This is critical for consumer projects like GRM that use their own
    Vikunja project with a different identifier prefix.
    """

    def _write_msg(self, content: str) -> str:
        fd, path = tempfile.mkstemp()
        with os.fdopen(fd, "w") as f:
            f.write(content)
        return path

    @patch("devx.ci.validate_commit_msg.get_latest_commit_msg")
    @patch.dict("os.environ", {"DEVX_TASK_PREFIX": "PROJ"})
    def test_master_accepts_proj_prefix(self, mock_commit: MagicMock) -> None:
        """Master branch accepts PROJ-N: prefix when DEVX_TASK_PREFIX=GRM."""
        import importlib

        import devx.ci.validate_commit_msg as vcm
        import devx.config

        importlib.reload(devx.config)
        importlib.reload(vcm)
        try:
            msg_path = self._write_msg("PROJ-66: fix: add scripts/** to infrastructure")
            with patch("devx.ci.validate_commit_msg.get_branch", return_value="master"):
                runner = CliRunner()
                result = runner.invoke(vcm.main, [msg_path])
                assert result.exit_code == 0
            os.unlink(msg_path)
        finally:
            os.environ.pop("DEVX_TASK_PREFIX", None)
            importlib.reload(devx.config)
            importlib.reload(vcm)

    @patch("devx.ci.validate_commit_msg.get_latest_commit_msg")
    @patch.dict("os.environ", {"DEVX_TASK_PREFIX": "PROJ"})
    def test_master_rejects_devx_prefix_when_proj_configured(self, mock_commit: MagicMock) -> None:
        """Master branch rejects DEVX-N: prefix when DEVX_TASK_PREFIX=GRM."""
        import importlib

        import devx.ci.validate_commit_msg as vcm
        import devx.config

        importlib.reload(devx.config)
        importlib.reload(vcm)
        try:
            msg_path = self._write_msg("DEVX-8: fix: wrong prefix")
            with patch("devx.ci.validate_commit_msg.get_branch", return_value="master"):
                runner = CliRunner()
                result = runner.invoke(vcm.main, [msg_path])
                assert result.exit_code == 1
                assert "PROJ-N" in result.output
            os.unlink(msg_path)
        finally:
            os.environ.pop("DEVX_TASK_PREFIX", None)
            importlib.reload(devx.config)
            importlib.reload(vcm)

    @patch("devx.ci.validate_commit_msg.get_latest_commit_msg")
    @patch.dict("os.environ", {"DEVX_TASK_PREFIX": "PROJ"})
    def test_feature_branch_rejects_proj_prefix(self, mock_commit: MagicMock) -> None:
        """Feature branch rejects PROJ-N: prefix when DEVX_TASK_PREFIX=GRM."""
        import importlib

        import devx.ci.validate_commit_msg as vcm
        import devx.config

        importlib.reload(devx.config)
        importlib.reload(vcm)
        try:
            msg_path = self._write_msg("PROJ-66: fix: should not have prefix on branch")
            with patch("devx.ci.validate_commit_msg.get_branch", return_value="PROJ-66-fix"):
                runner = CliRunner()
                result = runner.invoke(vcm.main, [msg_path])
                assert result.exit_code == 1
                assert "task ID" in result.output
            os.unlink(msg_path)
        finally:
            os.environ.pop("DEVX_TASK_PREFIX", None)
            importlib.reload(devx.config)
            importlib.reload(vcm)


def test_main_module_block() -> None:
    import tempfile

    with tempfile.NamedTemporaryFile(mode="w", delete=False) as f:
        f.write("DEVX-1: feat: test")
        msg_path = f.name

    with patch("devx.ci.validate_commit_msg.get_branch", return_value="master"):
        import devx.ci.validate_commit_msg as vcm

        with open(vcm.__file__) as f:
            source = f.read()
        # Remove __main__ block so exec doesn't call main() before we control sys.argv
        source = source.replace('if __name__ == "__main__":\n    main()\n', "")
        namespace = dict(vcm.__dict__)
        exec(compile(source, vcm.__file__, "exec"), namespace)
        # exec() redefines get_branch() from source, overwriting the mock.
        # Restore the patched mock so main() uses it.
        namespace["get_branch"] = vcm.get_branch
        namespace["main"]([msg_path], standalone_mode=False)

    os.unlink(msg_path)


class TestGitMode:
    def test_git_flag_reads_from_git(self, tmp_path) -> None:
        with patch("devx.ci.validate_commit_msg.get_latest_commit_msg", return_value="feat: add feature"):
            with patch("devx.ci.validate_commit_msg.get_branch", return_value="feature-branch"):
                runner = CliRunner()
                result = runner.invoke(main, ["--git"])
        assert result.exit_code == 0

    def test_git_flag_master_valid(self) -> None:
        msg = "DEVX-24: fix: resolve timeout"
        with patch("devx.ci.validate_commit_msg.get_latest_commit_msg", return_value=msg):
            with patch("devx.ci.validate_commit_msg.get_branch", return_value="master"):
                runner = CliRunner()
                result = runner.invoke(main, ["--git", "--branch", "master"])
        assert result.exit_code == 0

    def test_git_flag_master_invalid(self) -> None:
        msg = "fix: resolve timeout"
        with patch("devx.ci.validate_commit_msg.get_latest_commit_msg", return_value=msg):
            with patch("devx.ci.validate_commit_msg.get_branch", return_value="master"):
                runner = CliRunner()
                result = runner.invoke(main, ["--git", "--branch", "master"])
        assert result.exit_code != 0

    @patch("devx.ci.validate_commit_msg.get_branch")
    @patch("devx.ci.validate_commit_msg.get_latest_commit_msg")
    def test_no_file_no_git_raises(self, mock_commit: MagicMock, mock_branch: MagicMock) -> None:
        runner = CliRunner()
        result = runner.invoke(main, ["--branch", "master"])
        assert result.exit_code != 0

    def test_get_latest_commit_msg_success(self) -> None:
        with patch("subprocess.run") as mock_run:
            mock_run.return_value = subprocess.CompletedProcess(args=[], returncode=0, stdout="feat: test\n\nBody")
            result = get_latest_commit_msg()
        assert result == "feat: test\n\nBody"

    @patch("devx.ci.validate_commit_msg.get_latest_commit_msg")
    def test_stdin_input(self, mock_commit: MagicMock) -> None:
        with patch("devx.ci.validate_commit_msg.get_branch", return_value="feature-branch"):
            runner = CliRunner()
            result = runner.invoke(main, input="feat: add feature\n", args=["-", "--branch", "feature-branch"])
        assert result.exit_code == 0