import time

from selenium import webdriver
from selenium.common.exceptions import NoSuchElementException
from selenium.webdriver.chrome.options import Options
from selenium.webdriver.chrome.service import Service
from selenium.webdriver.common.by import By
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.support.ui import WebDriverWait

from .config import (
    CHROME_BINARY,
    CHROMEDRIVER_PATH,
    CLEAN_OLD_SESSIONS_DAYS,
    DIAGNOSTICOS_DIR,
    IDIOMA_INTERFACE,
    MODO_HEADLESS,
    REINTENTO_RELOAD_WAIT,
    REINTENTOS_RECONEXION,
    TIMEOUT_SESION,
)
from .utils import asegurar_directorio, cleanup_old_chrome_data, log_text, save_session_state


def hay_elemento_visible(driver, by, selector):
    try:
        elementos = driver.find_elements(by, selector)
    except Exception:
        return False

    for elemento in elementos:
        try:
            if elemento.is_displayed():
                return True
        except Exception:
            continue
    return False


def iniciar_driver():
    options = Options()
    options.binary_location = CHROME_BINARY

    argumentos = [
        "--user-data-dir=./perfil_whatsapp",
        "--profile-directory=Default",
        "--no-sandbox",
        "--disable-dev-shm-usage",
        "--disable-gpu",
        "--disable-software-rasterizer",
        "--disable-blink-features=AutomationControlled",
        "--disable-extensions",
        "--disable-infobars",
        "--remote-debugging-port=9222",
        "--window-size=1920,1080",
        "--log-level=3",
        "--start-maximized",
        "--disable-features=RendererCodeIntegrity",
        "--disable-web-security",
        "--disable-session-crashed-bubble",
        "--disable-popup-blocking",
        "--disable-notifications",
    ]

    for argumento in argumentos:
        options.add_argument(argumento)

    if MODO_HEADLESS:
        options.add_argument("--headless=new")

    options.add_experimental_option(
        "prefs",
        {
            "credentials_enable_service": False,
            "profile.password_manager_enabled": False,
        },
    )
    options.add_experimental_option("detach", True)
    options.add_experimental_option("excludeSwitches", ["enable-automation"])
    options.add_experimental_option("useAutomationExtension", False)

    cleanup_old_chrome_data(dirpath="./perfil_whatsapp", days=CLEAN_OLD_SESSIONS_DAYS)
    return webdriver.Chrome(service=Service(CHROMEDRIVER_PATH), options=options)


def construir_condiciones_xpath(idioma):
    textos_chat = {
        "es": ["Lista de chats", "Lista de conversaciones", "Chats", "Conversaciones"],
        "en": ["Chat list", "Chats", "Conversation list"],
        "pt": ["Lista de conversas", "Conversas"],
    }
    if idioma == "auto":
        return sum(textos_chat.values(), [])
    return textos_chat.get(idioma, textos_chat["en"])


def detectar_qr(driver):
    qr_selectores = [
        "canvas[aria-label*='Scan']",
        "canvas[aria-label*='escan' i]",
        "canvas[aria-label='Scan me!']",
        "div[data-ref] canvas",
    ]
    for selector in qr_selectores:
        try:
            qr = driver.find_element(By.CSS_SELECTOR, selector)
            if qr.is_displayed():
                return True
        except NoSuchElementException:
            continue
        except Exception:
            continue
    return False


def esperar_sesion_activa(driver, tiempo_maximo=TIMEOUT_SESION, idioma=IDIOMA_INTERFACE):
    print("Verificando sesion activa de WhatsApp Web...")
    inicio = time.time()
    textos = construir_condiciones_xpath(idioma)
    condiciones = " or ".join([f"contains(@aria-label, '{text}')" for text in textos])
    xpath_combinado = f"//div[{condiciones}] | //div[@data-testid='chat-list']"

    selectores_sesion = [
        (By.ID, "pane-side"),
        (By.ID, "side"),
        (By.CSS_SELECTOR, "[data-testid='chat-list']"),
        (By.CSS_SELECTOR, "[data-testid='cell-frame-container']"),
        (By.CSS_SELECTOR, "div[role='grid']"),
        (By.CSS_SELECTOR, "div[aria-label*='chat' i][role='grid']"),
    ]

    while time.time() - inicio < tiempo_maximo:
        try:
            elems = driver.find_elements(By.XPATH, xpath_combinado)
            for elem in elems:
                try:
                    if elem.is_displayed():
                        print("Sesion activa detectada.")
                        save_session_state(True)
                        return True
                except Exception:
                    continue

            for by, selector in selectores_sesion:
                if hay_elemento_visible(driver, by, selector):
                    print("Sesion activa detectada.")
                    save_session_state(True)
                    return True

            if detectar_qr(driver):
                print("QR detectado. Escanea el QR en el navegador...")
                time.sleep(2)
                continue

            try:
                WebDriverWait(driver, 3).until(
                    EC.presence_of_element_located(
                        (
                            By.CSS_SELECTOR,
                            "div[contenteditable='true'][role='textbox'], div[contenteditable='true'][data-tab]",
                        )
                    )
                )
                print("Interfaz detectada.")
                save_session_state(True)
                return True
            except Exception:
                pass
        except Exception as exc:
            print(f"Error verificando sesion: {exc}")

        time.sleep(1)

    print("No se detecto sesion activa.")
    save_session_state(False)

    try:
        asegurar_directorio(DIAGNOSTICOS_DIR)
        nombre = f"{DIAGNOSTICOS_DIR}/sesion_fallida_{int(time.time())}.png"
        driver.save_screenshot(nombre)
        print(f"Captura diagnostica guardada: {nombre}")
        log_text(f"SESION_FALLIDA captura:{nombre}")
    except Exception as exc:
        print(f"No se pudo guardar captura diagnostica: {exc}")

    return False


def ensure_session_active(driver, retries=REINTENTOS_RECONEXION):
    if esperar_sesion_activa(driver):
        return True

    for intento in range(1, retries + 1):
        try:
            print(f"Intento reconexion {intento}/{retries}")
            driver.get("https://web.whatsapp.com")
            time.sleep(REINTENTO_RELOAD_WAIT)

            if esperar_sesion_activa(driver, tiempo_maximo=TIMEOUT_SESION):
                print("Sesion recuperada.")
                return True
        except Exception as exc:
            print(f"Error reconectando: {exc}")

        time.sleep(2)

    print("No se pudo recuperar la sesion.")
    return False