import random

def get_headers():
    # ОС Chrome/Firefox
    platforms = [
        'Windows NT 10.0; Win64; x64',
        'Windows NT 10.0; WOW64',
        'Macintosh; Intel Mac OS X 10_15_7',
        'X11; Linux x86_64',
    ]

    # Chrome версии
    chrome_major = random.randint(120, 128)
    chrome_build = random.randint(6000, 9999)
    chrome_patch = random.randint(10, 200)

    chrome_ua = (
        f"Mozilla/5.0 ({random.choice(platforms)}) "
        f"AppleWebKit/537.36 (KHTML, like Gecko) "
        f"Chrome/{chrome_major}.0.{chrome_build}.{chrome_patch} Safari/537.36"
    )

    # Firefox версии
    ff_ver = random.randint(110, 125)
    firefox_ua = (
        f"Mozilla/5.0 ({random.choice(platforms)}; rv:{ff_ver}.0) "
        f"Gecko/20100101 Firefox/{ff_ver}.0"
    )

    # Выбираем браузер
    user_agent = random.choice([chrome_ua, firefox_ua])

    # sec-ch-ua зависит только от Chrome
    if "Chrome" in user_agent:
        sec_ch_ua = f'"Not_A Brand";v="8", "Chromium";v="{chrome_major}", "Google Chrome";v="{chrome_major}"'
        sec_ch_mob = "?0"
        sec_platform = '"Windows"' if "Windows" in user_agent else '"macOS"' if "Macintosh" in user_agent else '"Linux"'
    else:
        # Firefox их не отправляет
        sec_ch_ua = None
        sec_ch_mob = None
        sec_platform = None

    # Accept-Language
    accept_lang = random.choice([
        "ru-RU,ru;q=0.9,en-US;q=0.8",
        "ru-RU,ru;q=0.8,en-US;q=0.7",
        "ru-RU;q=0.9,ru;q=0.8,en-US;q=0.7",
        "ru-RU;q=0.8,ru;q=0.7,en-US;q=0.9",
        "ru;q=0.9,en;q=0.8",
        "ru;q=0.8,en;q=0.7",
        "ru;q=0.7,en;q=0.9",
        "en-US,en;q=0.9,ru-RU,ru;q=0.8",
        "en-US,en;q=0.8,ru-RU,ru;q=0.9",
        "en-US;q=0.9,ru-RU,ru;q=0.7",
        "en-US;q=0.8,ru-RU,ru;q=0.9",
        "en-US;q=0.7,ru-RU,ru;q=0.8",
        "en;q=0.9,ru;q=0.8",
        "en;q=0.8,ru;q=0.9",
        "en;q=0.7,ru;q=0.7",
    ])

    # Реалистичные fetch-заголовки Chrome
    sec_fetch_site = random.choice(["none", "same-site", "same-origin", "cross-site"])
    sec_fetch_mode = "navigate"
    sec_fetch_user = "?1"
    sec_fetch_dest = "document"

    # Заголовки в случайном порядке как в браузере
    headers_list = [
        ("User-Agent", user_agent),
        ("Accept", "text/html,application/json,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8"),
        ("Accept-Language", accept_lang),
        ("Accept-Encoding", "gzip, deflate, br, zstd"),
        ("Connection", "keep-alive"),
        ("Upgrade-Insecure-Requests", "1"),
    ]

    if sec_ch_ua:
        headers_list.extend([
            ("sec-ch-ua", sec_ch_ua),
            ("sec-ch-ua-mobile", sec_ch_mob),
            ("sec-ch-ua-platform", sec_platform),
            ("Sec-Fetch-Site", sec_fetch_site),
            ("Sec-Fetch-Mode", sec_fetch_mode),
            ("Sec-Fetch-User", sec_fetch_user),
            ("Sec-Fetch-Dest", sec_fetch_dest),
        ])

    # Перемешиваем порядок (!) — браузеры могут менять порядок
    random.shuffle(headers_list)

    # Превращаем в dict
    headers = {k: v for k, v in headers_list}

    return headers