import os
import tempfile

from alembic import config
from alembic import testing
from alembic import util
from alembic.migration import MigrationContext
from alembic.operations import Operations
from alembic.script import ScriptDirectory
from alembic.testing import assert_raises_message
from alembic.testing import eq_
from alembic.testing import mock
from alembic.testing.assertions import expect_raises_message
from alembic.testing.env import _no_sql_testing_config
from alembic.testing.env import _write_config_file
from alembic.testing.env import clear_staging_env
from alembic.testing.env import staging_env
from alembic.testing.fixtures import capture_db
from alembic.testing.fixtures import TestBase


class FileConfigTest(TestBase):
    def test_config_args(self):
        cfg = _write_config_file(
            """
[alembic]
migrations = %(base_path)s/db/migrations
"""
        )
        test_cfg = config.Config(
            cfg.config_file_name, config_args=dict(base_path="/home/alembic")
        )
        eq_(
            test_cfg.get_section_option("alembic", "migrations"),
            "/home/alembic/db/migrations",
        )

    def tearDown(self):
        clear_staging_env()


class ConfigTest(TestBase):
    def test_config_no_file_main_option(self):
        cfg = config.Config()
        cfg.set_main_option("url", "postgresql://foo/bar")

        eq_(cfg.get_main_option("url"), "postgresql://foo/bar")

    def test_config_no_file_section_option(self):
        cfg = config.Config()
        cfg.set_section_option("foo", "url", "postgresql://foo/bar")

        eq_(cfg.get_section_option("foo", "url"), "postgresql://foo/bar")

        cfg.set_section_option("foo", "echo", "True")
        eq_(cfg.get_section_option("foo", "echo"), "True")

    def test_config_set_main_option_percent(self):
        cfg = config.Config()
        cfg.set_main_option("foob", "a %% percent")

        eq_(cfg.get_main_option("foob"), "a % percent")

    def test_config_set_section_option_percent(self):
        cfg = config.Config()
        cfg.set_section_option("some_section", "foob", "a %% percent")

        eq_(cfg.get_section_option("some_section", "foob"), "a % percent")

    def test_config_set_section_option_interpolation(self):
        cfg = config.Config()
        cfg.set_section_option("some_section", "foob", "foob_value")

        cfg.set_section_option("some_section", "bar", "bar with %(foob)s")

        eq_(
            cfg.get_section_option("some_section", "bar"),
            "bar with foob_value",
        )

    def test_standalone_op(self):
        eng, buf = capture_db()

        env = MigrationContext.configure(eng)
        op = Operations(env)

        op.alter_column("t", "c", nullable=True)
        eq_(buf, ["ALTER TABLE t ALTER COLUMN c DROP NOT NULL"])

    def test_no_script_error(self):
        cfg = config.Config()
        assert_raises_message(
            util.CommandError,
            "No 'script_location' key found in configuration.",
            ScriptDirectory.from_config,
            cfg,
        )

    def test_attributes_attr(self):
        m1 = mock.Mock()
        cfg = config.Config()
        cfg.attributes["connection"] = m1
        eq_(cfg.attributes["connection"], m1)

    def test_attributes_constructor(self):
        m1 = mock.Mock()
        m2 = mock.Mock()
        cfg = config.Config(attributes={"m1": m1})
        cfg.attributes["connection"] = m2
        eq_(cfg.attributes, {"m1": m1, "connection": m2})

    @testing.combinations(
        (
            "legacy raw string 1",
            None,
            "/foo",
            ["/foo"],
        ),
        (
            "legacy raw string 2",
            None,
            "/foo /bar",
            ["/foo", "/bar"],
        ),
        (
            "legacy raw string 3",
            "space",
            "/foo",
            ["/foo"],
        ),
        (
            "legacy raw string 4",
            "space",
            "/foo /bar",
            ["/foo", "/bar"],
        ),
        (
            "multiline string 1",
            "newline",
            " /foo  \n/bar  ",
            ["/foo", "/bar"],
        ),
        (
            "Linux pathsep 1",
            ":",
            "/Project A",
            ["/Project A"],
        ),
        (
            "Linux pathsep 2",
            ":",
            "/Project A:/Project B",
            ["/Project A", "/Project B"],
        ),
        (
            "Windows pathsep 1",
            ";",
            r"C:\Project A",
            [r"C:\Project A"],
        ),
        (
            "Windows pathsep 2",
            ";",
            r"C:\Project A;C:\Project B",
            [r"C:\Project A", r"C:\Project B"],
        ),
        (
            "os pathsep",
            "os",
            r"path_number_one%(sep)spath_number_two%(sep)s"
            % {"sep": os.pathsep},
            [r"path_number_one", r"path_number_two"],
        ),
        (
            "invalid pathsep 2",
            "|",
            "/foo|/bar",
            ValueError(
                "'|' is not a valid value for version_path_separator; "
                "expected 'space', 'newline', 'os', ':', ';'"
            ),
        ),
        id_="iaaa",
        argnames="separator, string_value, expected_result",
    )
    def test_version_locations(self, separator, string_value, expected_result):
        cfg = config.Config()
        if separator is not None:
            cfg.set_main_option(
                "version_path_separator",
                separator,
            )
        cfg.set_main_option("script_location", tempfile.gettempdir())
        cfg.set_main_option("version_locations", string_value)

        if isinstance(expected_result, ValueError):
            message = str(expected_result)
            with expect_raises_message(ValueError, message, text_exact=True):
                ScriptDirectory.from_config(cfg)
        else:
            s = ScriptDirectory.from_config(cfg)
            eq_(s.version_locations, expected_result)


class StdoutOutputEncodingTest(TestBase):
    def test_plain(self):
        stdout = mock.Mock(encoding="latin-1")
        cfg = config.Config(stdout=stdout)
        cfg.print_stdout("test %s %s", "x", "y")
        eq_(
            stdout.mock_calls,
            [mock.call.write("test x y"), mock.call.write("\n")],
        )

    def test_utf8_unicode(self):
        stdout = mock.Mock(encoding="latin-1")
        cfg = config.Config(stdout=stdout)
        cfg.print_stdout("méil %s %s", "x", "y")
        eq_(
            stdout.mock_calls,
            [mock.call.write("méil x y"), mock.call.write("\n")],
        )

    def test_ascii_unicode(self):
        stdout = mock.Mock(encoding=None)
        cfg = config.Config(stdout=stdout)
        cfg.print_stdout("méil %s %s", "x", "y")
        eq_(
            stdout.mock_calls,
            [mock.call.write("m?il x y"), mock.call.write("\n")],
        )

    def test_only_formats_output_with_args(self):
        stdout = mock.Mock(encoding=None)
        cfg = config.Config(stdout=stdout)
        cfg.print_stdout("test 3%")
        eq_(
            stdout.mock_calls,
            [mock.call.write("test 3%"), mock.call.write("\n")],
        )


class TemplateOutputEncodingTest(TestBase):
    def setUp(self):
        staging_env()
        self.cfg = _no_sql_testing_config()

    def tearDown(self):
        clear_staging_env()

    def test_default(self):
        script = ScriptDirectory.from_config(self.cfg)
        eq_(script.output_encoding, "utf-8")

    def test_setting(self):
        self.cfg.set_main_option("output_encoding", "latin-1")
        script = ScriptDirectory.from_config(self.cfg)
        eq_(script.output_encoding, "latin-1")
