import json
import pytest
from pathlib import Path
from config.config_manager import ConfigManager, DEFAULT_CONFIG


def test_load_defaults_when_no_file(tmp_path):
    cm = ConfigManager(tmp_path / "config.json")
    assert cm.get()["active_profile"] == "pc1_dp"
    assert len(cm.get()["profiles"]) == 2


def test_saves_default_config_on_first_run(tmp_path):
    path = tmp_path / "config.json"
    ConfigManager(path)
    assert path.exists()
    data = json.loads(path.read_text())
    assert data["active_profile"] == "pc1_dp"


def test_load_existing_config(tmp_path):
    path = tmp_path / "config.json"
    custom = {"active_profile": "custom", "profiles": [], "device_triggers": [], "general": {}}
    path.write_text(json.dumps(custom))
    cm = ConfigManager(path)
    assert cm.get()["active_profile"] == "custom"


def test_fallback_on_corrupt_config(tmp_path):
    path = tmp_path / "config.json"
    path.write_text("not json {{{")
    cm = ConfigManager(path)
    assert cm.get()["active_profile"] == "pc1_dp"


def test_get_profile_returns_profile(tmp_path):
    cm = ConfigManager(tmp_path / "config.json")
    p = cm.get_profile("pc1_dp")
    assert p is not None
    assert p["name"] == "PC1 \u2014 DP"


def test_get_profile_returns_none_for_missing(tmp_path):
    cm = ConfigManager(tmp_path / "config.json")
    assert cm.get_profile("nonexistent") is None


def test_set_active_profile_persists(tmp_path):
    path = tmp_path / "config.json"
    cm = ConfigManager(path)
    cm.set_active_profile("pc2_hdmi")
    cm2 = ConfigManager(path)
    assert cm2.get_active_profile_id() == "pc2_hdmi"


def test_on_change_callback_fires(tmp_path):
    cm = ConfigManager(tmp_path / "config.json")
    called_with = []
    cm.on_change(lambda cfg: called_with.append(cfg["active_profile"]))
    cfg = cm.get().copy()
    cfg["active_profile"] = "pc2_hdmi"
    cm.update(cfg)
    assert called_with == ["pc2_hdmi"]