from django.core.mail import send_mail
from django.urls import reverse
from .models import EmailConfirmation
import uuid
from django.conf import settings
from django.utils.timezone import now
from backend.core.models import Document, Organization
from django.core.mail import EmailMultiAlternatives
from django.utils.html import format_html
from backend.core.utils import generate_first_page_image
from email.mime.image import MIMEImage

site_domain = settings.SITE_DOMAIN

def send_confirmation_email(email):
    confirmation, created = EmailConfirmation.objects.get_or_create(email=email)

    if not created:
        confirmation.uuid = uuid.uuid4()
        confirmation.created_at = now()
        confirmation.save()

    confirmation_link = f"{site_domain}{reverse('confirm_email', args=[confirmation.uuid])}"

    content_html = format_html(
        """
        <p>Dear user,</p>
        <p>To start generating your document, please confirm your email address by clicking the button below:</p>
        <p style="text-align:center;margin:32px 0;">
            <a href="{}" style="background:orange;color:#19161C;padding:12px 32px;
            border-radius:6px;text-decoration:none;font-weight:600;">Confirm Email</a>
        </p>
        <p style="color:#929292;">If you did not request this, you can safely ignore this message.</p>
        <p>Best regards,<br>Risklet Team</p>
        """,
        confirmation_link
    )
    html_message = render_email_template(content_html, title="Confirm Your Email")

    msg = EmailMultiAlternatives(
        subject="Confirm your email to start document generation",
        body=html_message,
        from_email=settings.DEFAULT_FROM_EMAIL,
        to=[email]
    )
    msg.content_subtype = "html"
    msg.send()

def send_payment_email(email):
    payment_link = f"{site_domain}{reverse('core:payment_page')}?email={email}"

    content_html = format_html(
        """
        <p>Dear customer,</p>
        <p>Your document is almost ready. Please complete the payment process to unlock the final version.</p>
        <p style="text-align:center;margin:32px 0;">
            <a href="{}" style="background:#28a745;color:#fff;padding:12px 32px;
            border-radius:6px;text-decoration:none;font-weight:600;display:inline-block;">
                Proceed to Payment
            </a>
        </p>
        <p style="color:#929292;">If you have already completed the payment, you can ignore this message.</p>
        <p>Best regards,<br>Risklet Team</p>
        """,
        payment_link,
    )
    html_message = render_email_template(content_html, title="Complete Your Payment")

    msg = EmailMultiAlternatives(
        subject="Complete your payment to finish document generation",
        body=html_message,
        from_email=settings.DEFAULT_FROM_EMAIL,
        to=[email],
    )
    msg.content_subtype = "html"
    msg.send()

def send_documet_to_expert(email, document):
    document_link = f"{site_domain}{reverse('core:document', args=[document.id])}"
    edit_link = f"{site_domain}{reverse('admin:core_document_change', args=[document.id])}"

    content_html = format_html(
        """
        <p>Hello,</p>
        <p>A new document has been assigned to you for expert analysis. Please review the details below:</p>
        <p style="text-align:center;margin:24px 0;">
            <a href="{}" style="display:inline-block;margin:0 8px;background:#0E3B43;color:#fff;
                padding:12px 28px;border-radius:6px;text-decoration:none;font-weight:600;">
                View Document
            </a>
            <a href="{}" style="display:inline-block;margin:0 8px;background:#28a745;color:#fff;
                padding:12px 28px;border-radius:6px;text-decoration:none;font-weight:600;">
                Edit in Admin
            </a>
        </p>
        <p>Thank you for your contribution.</p>
        <p>Best regards,<br>Risklet Team</p>
        """,
        document_link,
        edit_link,
    )
    html_message = render_email_template(content_html, title="New Expert Assignment")

    msg = EmailMultiAlternatives(
        subject="Document assigned for expert analysis",
        body=html_message,
        from_email=settings.DEFAULT_FROM_EMAIL,
        to=[email],
    )
    msg.content_subtype = "html"
    msg.send()

def send_document_to_reviewer(email, document):
    document_link = f"{site_domain}{reverse('core:document', args=[document.id])}"
    edit_link = f"{site_domain}{reverse('admin:core_document_change', args=[document.id])}"

    content_html = format_html(
        """
        <p>Hello,</p>
        <p>We encountered an issue while generating the document. Please review and complete the document before sending it to the customer.</p>
        <p style="text-align:center;margin:24px 0;">
            <a href="{}" style="display:inline-block;margin:0 8px;background:#0E3B43;color:#fff;
                padding:12px 28px;border-radius:6px;text-decoration:none;font-weight:600;">
                View Document
            </a>
            <a href="{}" style="display:inline-block;margin:0 8px;background:#28a745;color:#fff;
                padding:12px 28px;border-radius:6px;text-decoration:none;font-weight:600;">
                Edit in Admin
            </a>
        </p>
        <p>Once you finish, save the document and share it with the customer.</p>
        <p>Thank you for your help.<br>Risklet Team</p>
        """,
        document_link,
        edit_link,
    )
    html_message = render_email_template(content_html, title="Document Review Required")

    msg = EmailMultiAlternatives(
        subject="Document review required",
        body=html_message,
        from_email=settings.DEFAULT_FROM_EMAIL,
        to=[email],
    )
    msg.content_subtype = "html"
    msg.send()

def send_document_email(email, document_link, document):
    image_io = generate_first_page_image(document)

    content_html = format_html(
        """
        <p>Your document is ready. Click the preview below to open the full PDF:</p>
        <p style="text-align:center;margin:32px 0;">
            <a href="{}" target="_blank" style="display:inline-block;">
                <img src="cid:first_page" style="width:100%;max-width:320px;border:1px solid #0E3B43;
                border-radius:12px;" alt="Document Preview">
            </a>
        </p>
        <p>If you have any questions, feel free to reach out.</p>
        <p>Best regards,<br>Risklet Team</p>
        """,
        document_link,
    )
    html_message = render_email_template(content_html, title="Your Document is Ready")

    msg = EmailMultiAlternatives(
        subject="Your document is ready",
        body=html_message,
        from_email=settings.DEFAULT_FROM_EMAIL,
        to=[email],
    )
    msg.content_subtype = "html"

    image_attachment = MIMEImage(image_io.getvalue(), "image/jpeg")
    image_attachment.add_header("Content-ID", "<first_page>")
    msg.attach(image_attachment)
    msg.send()

def render_email_template(content_html, title = 'Risklet Notifications'):
    logo_url = f"https://risklet.com/static/img/risklet-icon.png"

    return format_html(
        """
        <div style="
            margin:32px auto;
            background:#fff;
            border:1px solid #0E3B43;
            border-radius:16px;
            font-family:'Darker Grotesque',Arial,sans-serif;
            color:#0E3B43;
            box-shadow:0 4px 24px rgba(14,59,67,0.07);
        ">
            <div style="
                background:#0E3B43;
                margin:0;
                padding:24px 0;
                text-align:center;
                border-top-left-radius:16px;
                border-top-right-radius:16px;
            ">
                <img src="{}" alt="Risklet Logo" style="
                    display:block;
                    margin:0 auto 12px auto;
                    height:56px;
                    width:auto;
                    border:none;
                ">
                <h2 style="
                    margin:0;
                    color:#fff;
                    font-weight:800;
                    font-size:24px;
                    letter-spacing:1px;
                ">
                    Risklet
                </h2>
            </div>
            <div style="padding:32px 24px;">
                <h2 style="
                    color:#0E3B43;
                    text-align:center;
                    margin:0 0 24px 0;
                    font-weight:800;
                    letter-spacing:1px;
                ">
                    {}
                </h2>
                <div style="font-size:1.15em;line-height:1.7;">
                    {}
                </div>
                <div style="
                    margin-top:32px;
                    text-align:center;
                    color:#0E3B43;
                    font-size:1em;
                    font-weight:600;
                ">
                    Risklet &mdash; Smart cybersecurity risk assessment
                </div>
            </div>
        </div>
        """,
        logo_url,
        title,
        content_html,
    )