import pytest

from briefcase.exceptions import BriefcaseCommandError


def test_single_source(base_command, my_app):
    """If an app provides a single source location and it matches, it is selected as the
    dist-info location."""
    my_app.sources = ["src/my_app"]

    assert base_command.app_module_path(my_app) == base_command.base_path / "src/my_app"


def test_no_prefix(base_command, my_app):
    """If an app provides a source location without a prefix and it matches, it is
    selected as the dist-info location."""
    my_app.sources = ["my_app"]

    assert base_command.app_module_path(my_app) == base_command.base_path / "my_app"


def test_long_prefix(base_command, my_app):
    """If an app provides a source location with a long prefix and it matches, it is
    selected as the dist-info location."""
    my_app.sources = ["path/to/src/my_app"]

    assert (
        base_command.app_module_path(my_app)
        == base_command.base_path / "path/to/src/my_app"
    )


def test_matching_source(base_command, my_app):
    """If an app provides a single matching source location, it is selected as the dist-
    info location."""
    my_app.sources = ["src/other", "src/my_app", "src/extra"]

    assert base_command.app_module_path(my_app) == base_command.base_path / "src/my_app"


def test_multiple_match(base_command, my_app):
    """If an app provides multiple matching source location, an error is raised."""
    my_app.sources = ["src/my_app", "extra/my_app"]

    with pytest.raises(
        BriefcaseCommandError,
        match=r"Multiple paths in sources found for application 'my-app'",
    ):
        base_command.app_module_path(my_app)


def test_hyphen_source(base_command, my_app):
    """If an app provides a single source location with a hyphen, an error is raised."""
    # The source directory must be a valid module, so hyphens aren't legal.
    my_app.sources = ["src/my-app"]

    with pytest.raises(
        BriefcaseCommandError,
        match=r"Unable to find code for application 'my-app'",
    ):
        base_command.app_module_path(my_app)


def test_no_match(base_command, my_app):
    """If an app provides a multiple locations, none of which match, an error is
    raised."""
    my_app.sources = ["src/pork", "src/spam"]

    with pytest.raises(
        BriefcaseCommandError,
        match=r"Unable to find code for application 'my-app'",
    ):
        base_command.app_module_path(my_app)


def test_no_source(base_command, my_app):
    """If an app provides no source locations, an error is raised."""
    my_app.sources = []

    with pytest.raises(
        BriefcaseCommandError,
        match=r"Unable to find code for application 'my-app'",
    ):
        base_command.app_module_path(my_app)