import os
import pytest
from config import validate, HEADERS, Config

class TestValidate:
    def test_valid_config(self, env_vars):
        cfg = validate()
        assert isinstance(cfg, Config)
        assert cfg.ics_url == "https://example.com/cal.ics"
        assert cfg.baikal_url == "https://baikal.com/dav.php/calendars/user/cal/"
        assert cfg.baikal_user == "user"
        assert cfg.baikal_pass == "pass"
        assert cfg.sync_frequency == 5

    def test_default_frequency(self, monkeypatch, env_vars):
        monkeypatch.delenv("SYNC_FREQUENCY", raising=False)
        cfg = validate()
        assert cfg.sync_frequency == 5

    def test_missing_ics_url(self, monkeypatch, env_vars):
        monkeypatch.delenv("ICS_URL", raising=False)
        with pytest.raises(ValueError, match="ICS_URL"):
            validate()

    def test_missing_all_required(self, monkeypatch, env_vars):
        for var in ["ICS_URL", "BAIKAL_URL", "BAIKAL_USER", "BAIKAL_PASS"]:
            monkeypatch.delenv(var, raising=False)
        with pytest.raises(ValueError):
            validate()

    def test_invalid_frequency(self, monkeypatch, env_vars):
        monkeypatch.setenv("SYNC_FREQUENCY", "-1")
        with pytest.raises(ValueError, match="SYNC_FREQUENCY"):
            validate()

    def test_frequency_zero(self, monkeypatch, env_vars):
        monkeypatch.setenv("SYNC_FREQUENCY", "0")
        with pytest.raises(ValueError, match="SYNC_FREQUENCY"):
            validate()

    def test_frequency_string(self, monkeypatch, env_vars):
        monkeypatch.setenv("SYNC_FREQUENCY", "abc")
        with pytest.raises(ValueError, match="SYNC_FREQUENCY"):
            validate()

class TestHeaders:
    def test_headers_exist(self):
        assert "User-Agent" in HEADERS
        assert "Unraid-Sync" in HEADERS["User-Agent"]