"""Unit tests for Chromium-only browser resolution."""
from __future__ import annotations

from pathlib import Path
from unittest.mock import MagicMock, patch

from chrome import (
    PROJECT_ROOT,
    _allow_google_chrome_fallback,
    _browser_runs_in_background,
    _bundled_chromedriver_for,
    _google_chrome_fallback_paths,
    _installed_chromium_paths,
    _portable_chromium_executable,
    _prefer_installed_chromium,
    capture_fullscreen_screenshot,
    find_chromium_executable,
)


def test_installed_paths_exclude_google():
    installed = _installed_chromium_paths()
    chrome_fb = _google_chrome_fallback_paths()
    assert not any("Google" in p for p in installed)
    assert any("Google" in p for p in chrome_fb)


def test_portable_chrome_win_preferred_over_installed():
    portable = str(PROJECT_ROOT / "chrome-win" / "chrome-win" / "chrome.exe")
    installed = r"C:\Program Files\Chromium\Application\chrome.exe"

    def fake_isfile(path: str) -> bool:
        return path in {portable, installed}

    env = {"USERPROFILE": r"C:\Users\test", "LOCALAPPDATA": r"C:\Users\test\AppData\Local"}
    with patch("chrome._portable_chromium_executable", return_value=portable):
        with patch("chrome.os.path.isfile", side_effect=fake_isfile):
            with patch.dict("os.environ", env, clear=True):
                assert find_chromium_executable() == portable


def test_installed_used_when_portable_missing():
    installed = r"C:\Program Files\Chromium\Application\chrome.exe"

    def fake_isfile(path: str) -> bool:
        return path == installed

    env = {"USERPROFILE": r"C:\Users\test", "LOCALAPPDATA": r"C:\Users\test\AppData\Local"}
    with patch("chrome._portable_chromium_executable", return_value=None):
        with patch("chrome.os.path.isfile", side_effect=fake_isfile):
            with patch.dict("os.environ", env, clear=True):
                assert find_chromium_executable() == installed


def test_misf_use_installed_chrome_skips_portable():
    portable = str(PROJECT_ROOT / "chrome-win" / "chrome-win" / "chrome.exe")
    installed = r"C:\Program Files\Chromium\Application\chrome.exe"

    def fake_isfile(path: str) -> bool:
        return path in {portable, installed}

    env = {
        "MISF_USE_INSTALLED_CHROME": "1",
        "USERPROFILE": r"C:\Users\test",
        "LOCALAPPDATA": r"C:\Users\test\AppData\Local",
    }
    with patch("chrome._portable_chromium_executable", return_value=portable):
        with patch("chrome.os.path.isfile", side_effect=fake_isfile):
            with patch.dict("os.environ", env, clear=True):
                assert find_chromium_executable() == installed


def test_find_chromium_can_use_google_with_allow_flag():
    google_path = r"C:\Program Files\Google\Chrome\Application\chrome.exe"

    env = {
        "MISF_ALLOW_CHROME": "1",
        "USERPROFILE": r"C:\Users\test",
        "LOCALAPPDATA": r"C:\Users\test\AppData\Local",
    }
    with patch("chrome._portable_chromium_executable", return_value=None):
        with patch("chrome.os.path.isfile", side_effect=lambda p: p == google_path):
            with patch.dict("os.environ", env, clear=True):
                assert find_chromium_executable() == google_path


def test_bundled_chromedriver_next_to_portable_chrome():
    browser = PROJECT_ROOT / "chrome-win" / "chrome-win" / "chrome.exe"
    if not browser.is_file():
        return
    driver = _bundled_chromedriver_for(str(browser))
    assert driver is not None
    assert driver.endswith("chromedriver.exe")


def test_portable_chromium_executable_on_disk():
    exe = _portable_chromium_executable()
    expected = PROJECT_ROOT / "chrome-win" / "chrome-win" / "chrome.exe"
    if expected.is_file():
        assert exe == str(expected)


def test_foreground_default_background_opt_in():
    with patch.dict("os.environ", {}, clear=True):
        assert _browser_runs_in_background() is False
    with patch.dict("os.environ", {"MISF_BROWSER_BACKGROUND": "1"}, clear=True):
        assert _browser_runs_in_background() is True


def test_allow_chrome_flag():
    with patch.dict("os.environ", {}, clear=True):
        assert _allow_google_chrome_fallback() is False
    with patch.dict("os.environ", {"MISF_ALLOW_CHROME": "yes"}, clear=True):
        assert _allow_google_chrome_fallback() is True


def test_prefer_installed_flag():
    with patch.dict("os.environ", {}, clear=True):
        assert _prefer_installed_chromium() is False
    with patch.dict("os.environ", {"MISF_USE_INSTALLED_CHROME": "1"}, clear=True):
        assert _prefer_installed_chromium() is True


def test_fullscreen_screenshot_maximizes_and_uses_desktop_when_not_black(tmp_path):
    driver = MagicMock()
    shot = tmp_path / "shot.png"
    shot.write_bytes(b"\xff" * 100)

    with patch.dict("os.environ", {}, clear=True):
        with patch("chrome.capture_desktop_screenshot", return_value=True) as cap:
            with patch("chrome._is_image_mostly_black", return_value=False):
                assert capture_fullscreen_screenshot(driver, shot) is True
                cap.assert_called_once_with(shot)
                driver.maximize_window.assert_called()


def test_fullscreen_screenshot_falls_back_when_desktop_is_black(tmp_path):
    driver = MagicMock()
    shot = tmp_path / "shot.png"
    shot.write_bytes(b"\x00" * 100)

    with patch.dict("os.environ", {}, clear=True):
        with patch("chrome.capture_desktop_screenshot", return_value=True):
            with patch("chrome._is_image_mostly_black", return_value=True):
                with patch("chrome._capture_browser_with_timestamp_bar", return_value=True) as fb:
                    assert capture_fullscreen_screenshot(driver, shot) is True
                    fb.assert_called_once()