import os
import sys
import importlib
import xml.etree.ElementTree as ET


PROJECT_ROOT = os.path.abspath(os.path.join(os.path.dirname(__file__), ".."))
if PROJECT_ROOT not in sys.path:
    sys.path.insert(0, PROJECT_ROOT)


def import_hostname():
    module_name = "scripts.hostname"
    if module_name in sys.modules:
        del sys.modules[module_name]
    return importlib.import_module(module_name)


def test_generate_random_string_length_and_charset():
    hostname = import_hostname()
    s = hostname.generate_random_string(10)
    assert len(s) == 10
    assert s.islower()
    assert s.isalpha()


def test_update_config_hostname_updates_xml(tmp_path):
    hostname = import_hostname()

    xml_path = tmp_path / "config.xml"
    xml_path.write_text(
        "<config><hostname>OLD</hostname><other>1</other></config>",
        encoding="utf-8",
    )

    old, changed = hostname.update_config_hostname(str(xml_path), "NEWNAME")
    assert changed is True
    assert old == "OLD"

    # Vérifie que le fichier a été modifié
    tree = ET.parse(str(xml_path))
    root = tree.getroot()
    assert root.find("hostname").text == "NEWNAME"


def test_update_config_hostname_no_hostname_element(tmp_path):
    hostname = import_hostname()

    xml_path = tmp_path / "config.xml"
    xml_path.write_text("<config><other>1</other></config>", encoding="utf-8")

    old, changed = hostname.update_config_hostname(str(xml_path), "NEWNAME")
    assert changed is False
    assert old is None


def test_main_does_nothing_when_hostname_different(monkeypatch):
    hostname = import_hostname()

    # Hostname différent => pas de changement
    monkeypatch.setattr(hostname.socket, "gethostname", lambda: "already-set")

    calls = {"apply": 0, "update": 0}

    def fake_update(path, new):
        calls["update"] += 1
        return ("OLD", True)

    def fake_apply(new):
        calls["apply"] += 1
        return 0

    monkeypatch.setattr(hostname, "update_config_hostname", fake_update)
    monkeypatch.setattr(hostname, "apply_hostname", fake_apply)
    monkeypatch.setattr(hostname, "configure_logging", lambda: None)

    hostname.main(expected_hostname="sd-satxx.dtx.io", config_path="/tmp/config.xml")

    assert calls["update"] == 0
    assert calls["apply"] == 0


def test_main_changes_when_expected_hostname(monkeypatch):
    hostname = import_hostname()

    # Hostname attendu => change
    monkeypatch.setattr(hostname.socket, "gethostname", lambda: "sd-satxx.dtx.io")
    monkeypatch.setattr(hostname, "configure_logging", lambda: None)

    # Fige le random
    monkeypatch.setattr(hostname, "generate_random_string", lambda n: "abcdefghij")

    captured = {"new": None, "config_path": None, "applied": None}

    def fake_update(path, new):
        captured["config_path"] = path
        captured["new"] = new
        return ("OLDHOST", True)

    def fake_apply(new):
        captured["applied"] = new
        return 0

    monkeypatch.setattr(hostname, "update_config_hostname", fake_update)
    monkeypatch.setattr(hostname, "apply_hostname", fake_apply)

    hostname.main(expected_hostname="sd-satxx.dtx.io", config_path="/conf/config.xml")

    assert captured["new"] == "DTX-SDSAT-abcdefghij"
    assert captured["applied"] == "DTX-SDSAT-abcdefghij"
    assert captured["config_path"] == "/conf/config.xml"