import os
from flask import current_app
from flask_mail import Mail, Message
import smtplib
from email.mime.text import MIMEText

class EmailSender:
    def __init__(self, app=None):
        self.mail = None
        if app is not None:
            self.init_app(app)

    def init_app(self, app):
        self.mail = Mail(app)

    def send_verification_email(self, to_email, token):
        verify_url = f"{current_app.config['FRONTEND_URL']}/auth/verify?token={token}"
        html_body = f'Click <a href="{verify_url}">here</a> to verify your account.'
        msg = Message(
            subject="Verify your account",
            recipients=[to_email],
            html=html_body,
            sender=current_app.config.get('MAIL_DEFAULT_SENDER', 'no-reply@reward-app.local')
        )
        if self.mail:
            self.mail.send(msg)
        else:
            print(f"[EMAIL to {to_email}] Verification: {verify_url}")

    def send_reset_password_email(self, to_email, token):
        reset_url = f"{current_app.config['FRONTEND_URL']}/auth/reset-password?token={token}"
        html_body = f'Click <a href="{reset_url}">here</a> to reset your password.'
        msg = Message(
            subject="Reset your password",
            recipients=[to_email],
            html=html_body,
            sender=current_app.config.get('MAIL_DEFAULT_SENDER', 'no-reply@reward-app.local')
        )
        if self.mail:
            self.mail.send(msg)
        else:
            print(f"[EMAIL to {to_email}] Reset password: {reset_url}")

    def send_pin_setup_email(self, to_email, code):
        html_body = f"""
        <div style='font-family:sans-serif;'>
          <h2>Set up your Parent PIN</h2>
          <p>To set your Parent PIN, enter the following code in the app:</p>
          <div style='font-size:2rem; font-weight:bold; letter-spacing:0.2em; margin:1.5rem 0;'>{code}</div>
          <p>This code is valid for 10 minutes.</p>
          <p>If you did not request this, you can ignore this email.</p>
          <hr>
          <div style='color:#888;font-size:0.95rem;'>Reward App</div>
        </div>
        """
        msg = Message(
            subject="Set up your Parent PIN",
            recipients=[to_email],
            html=html_body,
            sender=current_app.config.get('MAIL_DEFAULT_SENDER', 'no-reply@reward-app.local')
        )
        if self.mail:
            self.mail.send(msg)
        else:
            print(f"[EMAIL to {to_email}] Parent PIN setup code: {code}")