import os
from datetime import datetime, timedelta, timezone

import pytest


class DummyConfigManager:
    def __init__(self, values):
        self._values = values

    def get_config_value(self, section, key, fallback=None):
        return self._values.get((section, key), fallback)


def test_check_validity_accepts_candidate_machine_id(monkeypatch):
    from devices.utils.license_manager import LicenseManager

    lm = LicenseManager(config_manager=DummyConfigManager({}))
    monkeypatch.setattr(lm, "get_machine_id_candidates", lambda: ["MID-PRIMARY", "MID-ALT"])

    license_data = {
        "product": "BodyBalanceEvaluation",
        "license_id": "L1",
        "license_type": "full",
        "machine_id": "MID-ALT",
        "issued_at": datetime.now(timezone.utc).isoformat(),
        "expires_at": (datetime.now(timezone.utc) + timedelta(days=1)).isoformat().replace("+00:00", "Z"),
        "signature": "x",
        "features": {"export": True},
    }

    ok, msg = lm.check_validity(license_data, machine_id="MID-PRIMARY", grace_days=0)
    assert ok is True, msg


def test_resolve_license_paths_falls_back_to_persistent(monkeypatch, tmp_path):
    from devices.utils.license_manager import LicenseManager

    programdata = tmp_path / "programdata"
    persistent_dir = programdata / "BodyCheck" / "license"
    persistent_dir.mkdir(parents=True)
    (persistent_dir / "license.json").write_text('{"a":1}', encoding="utf-8")
    (persistent_dir / "license_public_key.pem").write_text("PUB", encoding="utf-8")

    cfg_dir = tmp_path / "cfg"
    cfg_license_path = str(cfg_dir / "license.json")
    cfg_pub_path = str(cfg_dir / "license_public_key.pem")

    cfg = DummyConfigManager(
        {
            ("LICENSE", "path"): cfg_license_path,
            ("LICENSE", "public_key"): cfg_pub_path,
            ("LICENSE", "grace_days"): "3",
        }
    )
    lm = LicenseManager(config_manager=cfg)

    monkeypatch.setenv("PROGRAMDATA", str(programdata))
    monkeypatch.setattr("platform.system", lambda: "Windows")

    license_path, pub_path, grace_days = lm._resolve_license_paths()
    assert license_path == str(persistent_dir / "license.json")
    assert pub_path == str(persistent_dir / "license_public_key.pem")
    assert grace_days == 3