import json
import logging
import os
from os.path import dirname, join
from time import strptime
from uuid import UUID

import httpx
from sqlalchemy import select

from app.core.db import sync_session_maker
from app.models.transaction import Transaction
from app.models.user import User

logger = logging.getLogger(__name__)

OAUTH_DIR = join(dirname(__file__), "..", "oauth")
CERTS = (
    join(OAUTH_DIR, "public_key.pem"),
    join(OAUTH_DIR, "private_key.key"),
)


def load_mock_bank_transactions(user_id: str) -> None:
    try:
        uid = UUID(str(user_id))
    except Exception:
        logger.error("Invalid user_id provided to bank_scraper (sync): %r", user_id)
        return

    _load_mock_bank_transactions(uid)


def load_all_mock_bank_transactions() -> None:
    with sync_session_maker() as session:
        users = session.execute(select(User)).unique().scalars().all()
        logger.info("[BankScraper] Starting Mock Bank scrape for all users | count=%d", len(users))

    processed = 0
    for user in users:
        try:
            _load_mock_bank_transactions(user.id)
            processed += 1
        except Exception:
            logger.exception("[BankScraper] Error scraping for user id=%s email=%s", user.id,
                             getattr(user, 'email', None))
    logger.info("[BankScraper] Finished Mock Bank scrape for all users | processed=%d", processed)


def _load_mock_bank_transactions(user_id: UUID) -> None:
    with sync_session_maker() as session:
        user: User | None = session.execute(select(User).where(User.id == user_id)).unique().scalar_one_or_none()
        if user is None:
            logger.warning("User not found for id=%s", user_id)
            return

        transactions = []
        with httpx.Client() as client:
            response = client.get(f"{os.getenv("APP_POD_URL")}/mock-bank/scrape")
            if response.status_code != httpx.codes.OK:
                return
            for transaction in response.json():
                transactions.append(
                    Transaction(
                        amount=transaction["amount"],
                        description=transaction.get("description"),
                        date=strptime(transaction["date"], "%Y-%m-%d"),
                        user_id=user_id,
                    )
                )

        for transaction in transactions:
            session.add(transaction)
        session.commit()


def load_ceska_sporitelna_transactions(user_id: str) -> None:
    try:
        uid = UUID(str(user_id))
    except Exception:
        logger.error("Invalid user_id provided to bank_scraper (sync): %r", user_id)
        return

    _load_ceska_sporitelna_transactions(uid)


def load_all_ceska_sporitelna_transactions() -> None:
    with sync_session_maker() as session:
        users = session.execute(select(User)).unique().scalars().all()
        logger.info("[BankScraper] Starting CSAS scrape for all users | count=%d", len(users))

    processed = 0
    for user in users:
        try:
            _load_ceska_sporitelna_transactions(user.id)
            processed += 1
        except Exception:
            logger.exception("[BankScraper] Error scraping for user id=%s email=%s", user.id,
                             getattr(user, 'email', None))
    logger.info("[BankScraper] Finished CSAS scrape for all users | processed=%d", processed)


def _load_ceska_sporitelna_transactions(user_id: UUID) -> None:
    with sync_session_maker() as session:
        user: User | None = session.execute(select(User).where(User.id == user_id)).unique().scalar_one_or_none()
        if user is None:
            logger.warning("User not found for id=%s", user_id)
            return

        cfg = user.config or {}
        if "csas" not in cfg:
            return

        cfg = json.loads(cfg["csas"])
        if "access_token" not in cfg:
            return

        accounts = []
        try:
            with httpx.Client(cert=CERTS, timeout=httpx.Timeout(20.0)) as client:
                response = client.get(
                    "https://webapi.developers.erstegroup.com/api/csas/sandbox/v4/account-information/my/accounts?size=10&page=0&sort=iban&order=desc",
                    headers={
                        "Authorization": f"Bearer {cfg['access_token']}",
                        "WEB-API-key": "09fdc637-3c57-4242-95f2-c2205a2438f3",
                        "user-involved": "false",
                    },
                )
                if response.status_code != httpx.codes.OK:
                    return

                for account in response.json().get("accounts", []):
                    accounts.append(account)

        except (httpx.HTTPError,) as e:
            logger.exception("[BankScraper] HTTP error during CSAS request | user_id=%s", user_id)
            return

        for account in accounts:
            acc_id = account.get("id")
            if not acc_id:
                continue

            url = f"https://webapi.developers.erstegroup.com/api/csas/sandbox/v4/account-information/my/accounts/{acc_id}/transactions?size=100&page=0&sort=bookingdate&order=desc"
            with httpx.Client(cert=CERTS) as client:
                response = client.get(
                    url,
                    headers={
                        "Authorization": f"Bearer {cfg['access_token']}",
                        "WEB-API-key": "09fdc637-3c57-4242-95f2-c2205a2438f3",
                        "user-involved": "false",
                    },
                )
                if response.status_code != httpx.codes.OK:
                    continue

                transactions = response.json().get("transactions", [])

            for transaction in transactions:
                description = transaction.get("entryDetails", {}).get("transactionDetails", {}).get(
                    "additionalRemittanceInformation")
                date_str = transaction.get("bookingDate", {}).get("date")
                date = strptime(date_str, "%Y-%m-%d") if date_str else None
                amount = transaction.get("amount", {}).get("value")
                if transaction.get("creditDebitIndicator") == "DBIT" and amount is not None:
                    amount = -abs(amount)

                if amount is None:
                    continue

                obj = Transaction(
                    amount=amount,
                    description=description,
                    date=date,
                    user_id=user_id,
                )
                session.add(obj)
            session.commit()