"""UIE-05: E2E tests for language toggle — FR/EN switching and localStorage persistence."""
from __future__ import annotations
import pytest


def test_language_toggle_switches_nav_label(page, live_server: str) -> None:
    """Clicking FR/EN button switches nav label from French to English."""
    page.goto(f"{live_server}/", wait_until="domcontentloaded")

    # Default lang is 'fr' — nav should show French labels
    # Wait for Alpine to hydrate
    page.wait_for_function(
        "document.querySelector('nav a[href=\"/printers\"]').textContent.trim() !== ''",
        timeout=3000,
    )

    # In French, printers nav label = 'Imprimantes'
    printers_label_fr = page.text_content("nav a[href='/printers']").strip()
    assert printers_label_fr == "Imprimantes", f"Expected 'Imprimantes', got '{printers_label_fr}'"

    # Click the language toggle button
    page.click("button[title='Toggle language']")

    # Wait for label to update
    page.wait_for_function(
        "document.querySelector('nav a[href=\"/printers\"]').textContent.trim() === 'Printers'",
        timeout=2000,
    )

    printers_label_en = page.text_content("nav a[href='/printers']").strip()
    assert printers_label_en == "Printers"

    # Cleanup: reset to fr
    page.evaluate("localStorage.setItem('imptune_lang', 'fr')")


def test_language_persists_across_reload(page, live_server: str) -> None:
    """After switching to EN, language is preserved on page reload."""
    page.goto(f"{live_server}/", wait_until="domcontentloaded")

    # Switch to English
    page.click("button[title='Toggle language']")
    page.wait_for_function(
        "document.querySelector('nav a[href=\"/printers\"]').textContent.trim() === 'Printers'",
        timeout=2000,
    )

    # Reload
    page.reload(wait_until="domcontentloaded")
    page.wait_for_function(
        "document.querySelector('nav a[href=\"/printers\"]').textContent.trim() !== ''",
        timeout=3000,
    )

    label_after_reload = page.text_content("nav a[href='/printers']").strip()
    assert label_after_reload == "Printers"

    # Cleanup: reset to fr
    page.evaluate("localStorage.setItem('imptune_lang', 'fr')")