"""
Tests for the settings hierarchy in app.get_settings().

Hierarchy under test: env-var defaults are returned when settings.json is
missing or malformed; the file wins when it exists and parses cleanly.
"""

import json
import os
import sys
import tempfile

import pytest

# Make the app module importable without installing it.
sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

import app as app_module  # noqa: E402


@pytest.fixture
def tmp_settings_path(monkeypatch, tmp_path):
    """Point app.SETTINGS_FILE at a temp path for the duration of the test."""
    path = tmp_path / "settings.json"
    monkeypatch.setattr(app_module, "SETTINGS_FILE", str(path))
    return path


def test_get_settings_returns_defaults_when_file_missing(tmp_settings_path, monkeypatch):
    monkeypatch.setenv("SYNC_SCHEDULE", "5 5 * * *")
    monkeypatch.setenv("MAX_QUALITY", "720")
    monkeypatch.setenv("SLEEP_INTERVAL", "7")
    monkeypatch.setenv("TZ", "UTC")
    assert not tmp_settings_path.exists()

    result = app_module.get_settings()

    assert result == {
        "sync_schedule": "5 5 * * *",
        "max_quality": "720",
        "sleep_interval": "7",
        "timezone": "UTC",
    }


def test_get_settings_returns_file_contents_when_present(tmp_settings_path):
    payload = {
        "sync_schedule": "0 4 * * *",
        "max_quality": "1440",
        "sleep_interval": "3",
        "timezone": "America/Phoenix",
    }
    tmp_settings_path.write_text(json.dumps(payload))

    assert app_module.get_settings() == payload


def test_get_settings_falls_back_on_malformed_json(tmp_settings_path, monkeypatch):
    monkeypatch.setenv("SYNC_SCHEDULE", "0 2 * * *")
    monkeypatch.setenv("MAX_QUALITY", "1080")
    monkeypatch.setenv("SLEEP_INTERVAL", "2")
    monkeypatch.setenv("TZ", "America/Phoenix")
    tmp_settings_path.write_text("{ this is not valid json ")

    result = app_module.get_settings()

    assert result["sync_schedule"] == "0 2 * * *"
    assert result["max_quality"] == "1080"
    assert result["sleep_interval"] == "2"
    assert result["timezone"] == "America/Phoenix"