import os
import time
import asyncio
from typing import Dict, Any
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from selenium.common.exceptions import WebDriverException, TimeoutException

from selenium_DDMA_eligibilityCheckWorker import AutomationDeltaDentalMAEligibilityCheck

# In-memory session store
sessions: Dict[str, Dict[str, Any]] = {}

SESSION_OTP_TIMEOUT = int(os.getenv("SESSION_OTP_TIMEOUT", "120"))  # seconds


def make_session_entry() -> str:
    """Create a new session entry and return its ID."""
    import uuid
    sid = str(uuid.uuid4())
    sessions[sid] = {
        "status": "created",     # created → running → waiting_for_otp → completed / error
        "created_at": time.time(),
        "last_activity": time.time(),
        "bot": None,             # AutomationDeltaDentalMAEligibilityCheck instance
        "driver": None,          # selenium webdriver
        "otp_event": asyncio.Event(),
        "otp_value": None,       # OTP submitted from the app
        "result": None,
        "message": None,
        "type": None,
    }
    return sid


async def cleanup_session(sid: str, message: str | None = None):
    """
    Wake any OTP waiter, set final state, and remove the session entry.
    Safe to call multiple times (idempotent).
    NOTE: Does NOT quit the browser driver — the persistent browser stays alive.
    """
    s = sessions.get(sid)
    if not s:
        return
    try:
        if s.get("status") not in ("completed", "error", "not_found"):
            s["status"] = "error"
        if message:
            s["message"] = message

        ev = s.get("otp_event")
        if ev and not ev.is_set():
            ev.set()
    finally:
        sessions.pop(sid, None)
        print(f"[helpers_ddma] cleaned session {sid}")


async def _remove_session_later(sid: str, delay: int = 20):
    await asyncio.sleep(delay)
    await cleanup_session(sid)


async def start_ddma_run(sid: str, data: dict, url: str):
    """
    Run the full DDMA eligibility workflow for one session.
    Called by agent.py inside a wrapper that manages the semaphore/counters.

    OTP handling uses two complementary strategies:
      1. Accept OTP submitted from the app (via /submit-otp endpoint → otp_value field)
      2. Poll the browser URL/DOM directly to detect when the user enters OTP themselves
    """
    s = sessions.get(sid)
    if not s:
        return {"status": "error", "message": "session not found"}

    s["status"] = "running"
    s["last_activity"] = time.time()

    try:
        bot = AutomationDeltaDentalMAEligibilityCheck({"data": data})
        bot.config_driver()

        s["bot"] = bot
        s["driver"] = bot.driver
        s["last_activity"] = time.time()

        # Navigate to login page
        try:
            if not url:
                raise ValueError("URL not provided for DDMA run")
            bot.driver.maximize_window()
            bot.driver.get(url)
            await asyncio.sleep(1)
        except Exception as e:
            s["status"] = "error"
            s["message"] = f"Navigation failed: {e}"
            await cleanup_session(sid)
            return {"status": "error", "message": s["message"]}

        # Login
        try:
            login_result = bot.login(url)
        except WebDriverException as wde:
            s["status"] = "error"
            s["message"] = f"Selenium driver error during login: {wde}"
            await cleanup_session(sid, s["message"])
            return {"status": "error", "message": s["message"]}
        except Exception as e:
            s["status"] = "error"
            s["message"] = f"Unexpected error during login: {e}"
            await cleanup_session(sid, s["message"])
            return {"status": "error", "message": s["message"]}

        # ── Path: already logged in (persistent session) ──────────────────────
        if isinstance(login_result, str) and login_result == "ALREADY_LOGGED_IN":
            print("[start_ddma_run] Session persisted - skipping OTP")
            s["status"] = "running"
            s["message"] = "Session persisted"

        # ── Path: OTP required ────────────────────────────────────────────────
        elif isinstance(login_result, str) and login_result == "OTP_REQUIRED":
            s["status"] = "waiting_for_otp"
            s["message"] = "OTP required for login - please enter OTP"
            s["last_activity"] = time.time()

            driver = s["driver"]

            # Poll every second for up to SESSION_OTP_TIMEOUT seconds.
            # Accept OTP from two sources:
            #   a) app API (otp_value set by submit_otp())
            #   b) user entering OTP directly in the browser window
            max_polls = SESSION_OTP_TIMEOUT
            login_success = False

            print(f"[OTP] Polling for OTP completion (up to {SESSION_OTP_TIMEOUT}s)...")

            for poll in range(max_polls):
                await asyncio.sleep(1)
                s["last_activity"] = time.time()

                try:
                    # a) App submitted OTP via /submit-otp endpoint
                    otp_value = s.get("otp_value")
                    if otp_value:
                        print(f"[OTP poll {poll+1}] OTP received from app, typing it in...")
                        try:
                            otp_input = driver.find_element(By.XPATH,
                                "//input[contains(@aria-label,'Verification') or contains(@placeholder,'verification') or @type='tel' or contains(@aria-lable,'Verification code') or contains(@placeholder,'Enter your verification code')]"
                            )
                            otp_input.clear()
                            otp_input.send_keys(otp_value)
                            try:
                                verify_btn = driver.find_element(By.XPATH, "//button[@type='button' and @aria-label='Verify']")
                                verify_btn.click()
                            except Exception:
                                otp_input.send_keys("\n")
                            print("[OTP] OTP typed and submitted via app")
                            s["otp_value"] = None  # Clear so we don't re-submit
                            await asyncio.sleep(3)
                        except Exception as type_err:
                            print(f"[OTP] Failed to type OTP from app: {type_err}")

                    # b) Check URL — if we're past OTP page, login succeeded
                    current_url = driver.current_url.lower()
                    print(f"[OTP poll {poll+1}/{max_polls}] URL: {current_url[:70]}...")

                    if "member" in current_url or "dashboard" in current_url or "eligibility" in current_url:
                        try:
                            member_search = WebDriverWait(driver, 5).until(
                                EC.presence_of_element_located((By.XPATH, '//input[@placeholder="Search by member ID"]'))
                            )
                            print("[OTP] Member search found — login successful!")
                            login_success = True
                            break
                        except TimeoutException:
                            print("[OTP] On member page but search input not found, continuing...")

                    # Check if OTP input is still visible (user hasn't finished)
                    try:
                        otp_input_elem = driver.find_element(By.XPATH,
                            "//input[contains(@aria-label,'Verification') or contains(@placeholder,'verification') or @type='tel']"
                        )
                        print(f"[OTP poll {poll+1}] OTP input still visible - waiting...")
                    except Exception:
                        # OTP input gone — may mean login is completing; try members page
                        if "onboarding" in current_url or "start" in current_url:
                            print("[OTP] OTP input gone, trying to navigate to members page...")
                            try:
                                driver.get("https://providers.deltadentalma.com/members")
                                await asyncio.sleep(2)
                            except Exception:
                                pass

                except Exception as poll_err:
                    print(f"[OTP poll {poll+1}] Error: {poll_err}")

            if not login_success:
                # Final check — navigate directly to members page
                try:
                    print("[OTP] Final attempt - navigating to members page...")
                    driver.get("https://providers.deltadentalma.com/members")
                    await asyncio.sleep(3)
                    member_search = WebDriverWait(driver, 10).until(
                        EC.presence_of_element_located((By.XPATH, '//input[@placeholder="Search by member ID"]'))
                    )
                    print("[OTP] Member search found — login successful!")
                    login_success = True
                except TimeoutException:
                    s["status"] = "error"
                    s["message"] = "OTP timeout - login not completed"
                    await cleanup_session(sid)
                    return {"status": "error", "message": "OTP not completed in time"}
                except Exception as final_err:
                    s["status"] = "error"
                    s["message"] = f"OTP verification failed: {final_err}"
                    await cleanup_session(sid)
                    return {"status": "error", "message": s["message"]}

            if login_success:
                s["status"] = "running"
                s["message"] = "Login successful after OTP"
                print("[OTP] Proceeding to step1...")

        # ── Path: login succeeded without OTP ─────────────────────────────────
        elif isinstance(login_result, str) and login_result == "SUCCESS":
            print("[start_ddma_run] Login succeeded without OTP")
            s["status"] = "running"
            s["message"] = "Login succeeded"

        # ── Path: login error ──────────────────────────────────────────────────
        elif isinstance(login_result, str) and login_result.startswith("ERROR"):
            s["status"] = "error"
            s["message"] = login_result
            await cleanup_session(sid)
            return {"status": "error", "message": login_result}

        # ── Step 1: search ────────────────────────────────────────────────────
        step1_result = bot.step1()
        if isinstance(step1_result, str) and step1_result.startswith("ERROR"):
            s["status"] = "error"
            s["message"] = step1_result
            await cleanup_session(sid)
            return {"status": "error", "message": step1_result}

        # ── Step 2: PDF generation ────────────────────────────────────────────
        step2_result = bot.step2()
        if isinstance(step2_result, dict) and step2_result.get("status") == "success":
            s["status"] = "completed"
            s["result"] = step2_result
            s["message"] = "completed"
            asyncio.create_task(_remove_session_later(sid, 30))
            return step2_result
        else:
            s["status"] = "error"
            if isinstance(step2_result, dict):
                s["message"] = step2_result.get("message", "unknown error")
            else:
                s["message"] = str(step2_result)
            await cleanup_session(sid)
            return {"status": "error", "message": s["message"]}

    except Exception as e:
        s["status"] = "error"
        s["message"] = f"worker exception: {e}"
        await cleanup_session(sid)
        return {"status": "error", "message": s["message"]}


def submit_otp(sid: str, otp: str) -> Dict[str, Any]:
    """
    Called when the app sends an OTP via POST /submit-otp.
    Sets otp_value on the session so the polling loop picks it up.
    """
    s = sessions.get(sid)
    if not s:
        return {"status": "error", "message": "session not found"}
    if s.get("status") != "waiting_for_otp":
        return {"status": "error", "message": f"session not waiting for OTP (state={s.get('status')})"}
    s["otp_value"] = otp
    s["last_activity"] = time.time()
    try:
        s["otp_event"].set()
    except Exception:
        pass
    return {"status": "ok", "message": "otp accepted"}


def get_session_status(sid: str) -> Dict[str, Any]:
    s = sessions.get(sid)
    if not s:
        return {"status": "not_found"}
    return {
        "session_id": sid,
        "status": s.get("status"),
        "message": s.get("message"),
        "created_at": s.get("created_at"),
        "last_activity": s.get("last_activity"),
        "result": s.get("result") if s.get("status") == "completed" else None,
    }