import pytest
from agebd.subs import SubstitutionError, Substitutions, UnknownTokenError
from agebd.utils import get_git_root

from ci.render_subs import main, render

REPO_ROOT = get_git_root(__file__)
CONFIG_DIR = REPO_ROOT / "config"


@pytest.fixture
def service_tree(tmp_path):
    ioc = tmp_path / "ioc"
    ioc.mkdir()
    (ioc / "AGEBD-CPCL-TUNE_main.subs").write_text("{ AGEBD-TUNE@@agebd_env_suffix_upper@@ }\n")
    (ioc / "AGEBD-CPCL-TUNE_parameters.yaml").write_text(
        "ioc_host: sls-vserv-bd-01@@agebd_env_suffix_lower@@\nioc_port: @@ioc_port@@\n"
    )
    systemd = tmp_path / "systemd"
    systemd.mkdir()
    (systemd / "AGEBD-SERVICE-TUNE.service").write_text("Environment=AGEBD_ENV=@@agebd_env@@\n")
    return tmp_path


def test_renders_a_whole_service_for_dev(service_tree):
    subs = Substitutions.for_service("dev", "tune", config_dir=CONFIG_DIR)

    changed = render(subs, [service_tree / "ioc", service_tree / "systemd"])

    assert len(changed) == 3
    assert "AGEBD-TUNE-DEV" in (service_tree / "ioc/AGEBD-CPCL-TUNE_main.subs").read_text()
    assert (service_tree / "ioc/AGEBD-CPCL-TUNE_parameters.yaml").read_text() == (
        "ioc_host: sls-vserv-bd-01-dev\nioc_port: 50007\n"
    )
    assert (service_tree / "systemd/AGEBD-SERVICE-TUNE.service").read_text() == (
        "Environment=AGEBD_ENV=dev\n"
    )


def test_renders_a_whole_service_for_prod(service_tree):
    subs = Substitutions.for_service("prod", "tune", config_dir=CONFIG_DIR)

    render(subs, [service_tree / "ioc", service_tree / "systemd"])

    assert "{ AGEBD-TUNE }" in (service_tree / "ioc/AGEBD-CPCL-TUNE_main.subs").read_text()
    assert "sls-vserv-bd-01\n" in (service_tree / "ioc/AGEBD-CPCL-TUNE_parameters.yaml").read_text()


def test_missing_path_is_skipped_not_fatal(service_tree, capsys):
    subs = Substitutions.for_service("dev", "tune", config_dir=CONFIG_DIR)

    render(subs, [service_tree / "systemd", service_tree / "does-not-exist"])

    assert "skipped (does not exist)" in capsys.readouterr().out


def test_leaves_nothing_unrendered(service_tree):
    subs = Substitutions.for_service("dev", "tune", config_dir=CONFIG_DIR)

    render(subs, [service_tree])

    for path in service_tree.rglob("*"):
        if path.is_file():
            assert "@@" not in path.read_text(), path


def test_rendering_is_idempotent(service_tree):
    subs = Substitutions.for_service("dev", "tune", config_dir=CONFIG_DIR)

    assert len(render(subs, [service_tree])) == 3
    assert render(subs, [service_tree]) == []


def test_per_service_token_without_service_fails_loudly(service_tree):
    """Without --service there is no ioc_port, and that must not pass silently."""
    subs = Substitutions.for_env("dev", config_dir=CONFIG_DIR)

    with pytest.raises(UnknownTokenError, match="ioc_port"):
        render(subs, [service_tree / "ioc"])


def test_main_renders_via_the_command_line(service_tree):
    exit_code = main(["--env", "dev", "--service", "tune", str(service_tree / "systemd")])

    assert exit_code == 0
    assert (service_tree / "systemd/AGEBD-SERVICE-TUNE.service").read_text() == (
        "Environment=AGEBD_ENV=dev\n"
    )


def test_main_rejects_an_undeclared_environment(service_tree):
    with pytest.raises(SubstitutionError, match="staging"):
        main(["--env", "staging", "--service", "tune", str(service_tree / "systemd")])