"""Unit tests for pure helpers in ``launcher.py``.

These cover code paths that are not exercised by the E2E launcher tests
(`test_e2e.py`) because they live in private helpers below the Playwright
boundary. The tests instantiate ``InvisiblePlaywright`` for the methods
that read ``self._profile`` but never enter ``__enter__``, so no Firefox
binary or virtual display is required.
"""
from __future__ import annotations

import pytest

from invisible_playwright import InvisiblePlaywright
from invisible_playwright.launcher import (
    _CHROME_H,
    _CHROME_W,
    _IANA_TO_POSIX_TZ,
    _TASKBAR_H,
    _tz_env,
)


# ── _tz_env (IANA → POSIX) ────────────────────────────────────────────


@pytest.mark.unit
def test_tz_env_eastern_us_maps_to_posix_with_dst():
    """Eastern US zones share the same POSIX form; spot-check a few."""
    assert _tz_env("America/New_York") == "EST5EDT"
    assert _tz_env("America/Detroit") == "EST5EDT"
    assert _tz_env("America/Indiana/Indianapolis") == "EST5EDT"


@pytest.mark.unit
def test_tz_env_central_mountain_pacific_map_to_posix_with_dst():
    assert _tz_env("America/Chicago") == "CST6CDT"
    assert _tz_env("America/Denver") == "MST7MDT"
    assert _tz_env("America/Los_Angeles") == "PST8PDT"


@pytest.mark.unit
def test_tz_env_phoenix_strips_dst():
    """Arizona (outside Navajo Nation) does NOT observe DST. The POSIX
    form must be ``MST7`` (no second segment) — using ``MST7MDT`` caused
    FP Pro to deduce vpn_origin_timezone=America/Denver from a 60-minute
    offset error in summer. Guard against regression of that mapping.
    """
    assert _tz_env("America/Phoenix") == "MST7"


@pytest.mark.unit
def test_tz_env_honolulu_strips_dst():
    """Hawaii does not observe DST. POSIX form ``HST10`` (no DST segment)."""
    assert _tz_env("Pacific/Honolulu") == "HST10"


@pytest.mark.unit
def test_tz_env_passthrough_for_unmapped_zone():
    """Zones outside the lookup table fall through to their IANA name —
    glibc on Linux reads /usr/share/zoneinfo directly. Windows MSVCRT
    won't understand them but that's accepted; the mapping covers the
    common residential-proxy zones."""
    assert _tz_env("Europe/Berlin") == "Europe/Berlin"
    assert _tz_env("Asia/Tokyo") == "Asia/Tokyo"


@pytest.mark.unit
def test_tz_env_empty_string_passes_through():
    """Empty string is never set as ``TZ`` by the caller, but the helper
    is still defensive — return it unchanged rather than raising."""
    assert _tz_env("") == ""


@pytest.mark.unit
def test_iana_to_posix_phoenix_and_honolulu_present():
    """Sanity-check the no-DST entries are still in the mapping; deleting
    them would silently revert the Phoenix DST bug."""
    assert _IANA_TO_POSIX_TZ["America/Phoenix"] == "MST7"
    assert _IANA_TO_POSIX_TZ["Pacific/Honolulu"] == "HST10"


# ── InvisiblePlaywright._humanize_max_seconds ─────────────────────────


@pytest.mark.unit
def test_humanize_true_defaults_to_one_and_a_half_seconds():
    ip = InvisiblePlaywright(seed=42, humanize=True)
    assert ip._humanize_max_seconds() == 1.5


@pytest.mark.unit
def test_humanize_float_passes_through_as_seconds():
    ip = InvisiblePlaywright(seed=42, humanize=2.5)
    assert ip._humanize_max_seconds() == 2.5


@pytest.mark.unit
def test_humanize_int_coerced_to_float():
    """``humanize=3`` is valid (truthy, not ``True``) → float coercion."""
    ip = InvisiblePlaywright(seed=42, humanize=3)
    out = ip._humanize_max_seconds()
    assert out == 3.0
    assert isinstance(out, float)


@pytest.mark.unit
def test_humanize_small_float_passes_through():
    """Below the default cap — the user's value wins."""
    ip = InvisiblePlaywright(seed=42, humanize=0.4)
    assert ip._humanize_max_seconds() == 0.4


# ── InvisiblePlaywright._default_context_kwargs ───────────────────────


@pytest.mark.unit
def test_default_context_viewport_subtracts_window_chrome():
    """Viewport must fit inside the spoofed screen with the headed
    window chrome subtracted. Otherwise Playwright complains about the
    viewport being larger than the screen."""
    ip = InvisiblePlaywright(seed=42)
    kw = ip._default_context_kwargs()
    p = ip._profile
    assert kw["viewport"]["width"] == p.screen.width - _CHROME_W
    assert kw["viewport"]["height"] == p.screen.height - _TASKBAR_H - _CHROME_H


@pytest.mark.unit
def test_default_context_screen_matches_profile():
    ip = InvisiblePlaywright(seed=42)
    kw = ip._default_context_kwargs()
    p = ip._profile
    assert kw["screen"] == {"width": p.screen.width, "height": p.screen.height}
    assert kw["device_scale_factor"] == p.screen.dpr


@pytest.mark.unit
def test_default_context_color_scheme_follows_dark_theme():
    """``color_scheme`` must match ``profile.dark_theme`` so the Playwright
    realm tells matchMedia the same thing the prefs tell the chrome."""
    ip_dark = InvisiblePlaywright(seed=42, pin={"dark_theme": True})
    ip_light = InvisiblePlaywright(seed=42, pin={"dark_theme": False})
    assert ip_dark._default_context_kwargs()["color_scheme"] == "dark"
    assert ip_light._default_context_kwargs()["color_scheme"] == "light"


@pytest.mark.unit
def test_default_context_includes_timezone_when_set():
    ip = InvisiblePlaywright(seed=42, timezone="America/New_York")
    assert ip._default_context_kwargs()["timezone_id"] == "America/New_York"


@pytest.mark.unit
def test_default_context_omits_timezone_when_empty():
    """Default ``timezone=""`` means "let the host TZ leak through" —
    Playwright must not receive ``timezone_id`` at all in that case,
    otherwise it overrides to the literal empty string."""
    ip = InvisiblePlaywright(seed=42)
    assert "timezone_id" not in ip._default_context_kwargs()


@pytest.mark.unit
def test_default_context_includes_locale_when_set():
    ip = InvisiblePlaywright(seed=42, locale="de-DE")
    assert ip._default_context_kwargs()["locale"] == "de-DE"


@pytest.mark.unit
def test_default_context_omits_locale_when_empty():
    ip = InvisiblePlaywright(seed=42, locale="")
    assert "locale" not in ip._default_context_kwargs()


# ── InvisiblePlaywright._build_env — WebRTC egress auto-derive ─────────
# Locks the 2026-06-10 fix: behind a proxy the launcher feeds the discovered
# egress IP to nICEr (srflx override) + drops IPv6. Without it, a proxied
# session's WebRTC silently fell back to leaking/blocking. Runs in tests.yml.


@pytest.mark.unit
def test_build_env_injects_webrtc_egress_when_discovered():
    ip = InvisiblePlaywright(seed=42)
    ip._webrtc_egress_ip = "203.0.113.9"  # what __enter__ resolves behind a proxy
    env = ip._build_env()
    assert env["STEALTHFOX_WEBRTC_PUBLIC_IP"] == "203.0.113.9"
    assert env["STEALTHFOX_WEBRTC_DISABLE_IPV6"] == "1"


@pytest.mark.unit
def test_build_env_no_webrtc_keys_without_proxy(monkeypatch):
    monkeypatch.delenv("STEALTHFOX_WEBRTC_PUBLIC_IP", raising=False)
    ip = InvisiblePlaywright(seed=42)
    ip._webrtc_egress_ip = None  # no proxy → real STUN already truthful
    env = ip._build_env()
    assert "STEALTHFOX_WEBRTC_PUBLIC_IP" not in env
    assert "STEALTHFOX_WEBRTC_DISABLE_IPV6" not in env


@pytest.mark.unit
def test_build_env_caller_env_override_wins(monkeypatch):
    monkeypatch.setenv("STEALTHFOX_WEBRTC_PUBLIC_IP", "198.51.100.5")
    ip = InvisiblePlaywright(seed=42)
    ip._webrtc_egress_ip = "203.0.113.9"  # auto-discovered
    env = ip._build_env()
    assert env["STEALTHFOX_WEBRTC_PUBLIC_IP"] == "198.51.100.5"  # caller wins
    assert env["STEALTHFOX_WEBRTC_DISABLE_IPV6"] == "1"