from otree.api import *
import os
import smtplib
from email.message import EmailMessage


class C(BaseConstants):
    NAME_IN_URL = 'email_test'
    PLAYERS_PER_GROUP = None
    NUM_ROUNDS = 1


class Subsession(BaseSubsession):
    pass


class Group(BaseGroup):
    pass


class Player(BasePlayer):
    pass


def send_gmail_smtp(subject: str, body: str, to_email: str):
    gmail_user = os.environ.get("GMAIL_USER")
    gmail_app_pw = (os.environ.get("GMAIL_APP_PASSWORD") or "").replace(" ", "")

    if not gmail_user or not gmail_app_pw:
        raise RuntimeError("Missing GMAIL_USER or GMAIL_APP_PASSWORD environment variables.")

    msg = EmailMessage()
    msg["Subject"] = subject
    msg["From"] = gmail_user
    msg["To"] = to_email
    msg.set_content(body)

    with smtplib.SMTP("smtp.gmail.com", 587) as smtp:
        smtp.ehlo()
        smtp.starttls()
        smtp.login(gmail_user, gmail_app_pw)
        smtp.send_message(msg)


class SendEmail(Page):
    @staticmethod
    def before_next_page(player, timeout_happened):
        to_email = os.environ.get("GMAIL_USER")  # send to yourself for test
        send_gmail_smtp(
            subject="oTree Email Test ✅ (SMTP direct)",
            body="If you received this, SMTP works inside oTree too (without Django mail backend).",
            to_email=to_email,
        )


page_sequence = [SendEmail]