orion/app/modules/messaging/services/email_service.py

# app/modules/messaging/services/email_service.py
"""
Email service with multi-provider support.

Supports:
- SMTP (default)
- SendGrid
- Mailgun
- Amazon SES

Features:
- Multi-language templates from database
- Store template overrides
- Jinja2 template rendering
- Email logging and tracking
- Queue support via background tasks
- Branding based on store tier (whitelabel)

Language Resolution (priority order):
1. Explicit language parameter
2. Customer's preferred language (if customer context)
3. Store's storefront language
4. Platform default (en)

Template Resolution (priority order):
1. Store override (if store_id and template is not platform-only)
2. Platform template
3. English fallback (if requested language not found)
"""

import json
import logging
import smtplib
from abc import ABC, abstractmethod
from dataclasses import dataclass
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from typing import Any

from jinja2 import BaseLoader, Environment
from sqlalchemy.orm import Session

from app.core.config import settings
from app.modules.messaging.models import (
    EmailLog,
    EmailStatus,
    EmailTemplate,
    StoreEmailTemplate,
)

logger = logging.getLogger(__name__)

# Platform branding constants
PLATFORM_NAME = "Wizamart"
PLATFORM_SUPPORT_EMAIL = "support@wizamart.com"
PLATFORM_DEFAULT_LANGUAGE = "en"
SUPPORTED_LANGUAGES = ["en", "fr", "de", "lb"]

# Tiers that get white-label (no "Powered by Wizamart" footer)
WHITELABEL_TIERS = {"business", "enterprise"}

# Powered by Wizamart footer (added for Essential/Professional tiers)
POWERED_BY_FOOTER_HTML = """
<div style="margin-top: 30px; padding-top: 20px; border-top: 1px solid #e5e7eb; text-align: center;">
    <p style="color: #9ca3af; font-size: 12px; margin: 0;">
        Powered by <a href="https://wizamart.com" style="color: #6b46c1; text-decoration: none;">Wizamart</a>
    </p>
</div>
"""

POWERED_BY_FOOTER_TEXT = "\n\n---\nPowered by Wizamart - https://wizamart.com"


@dataclass
class ResolvedTemplate:
    """Resolved template content after checking store overrides."""

    subject: str
    body_html: str
    body_text: str | None
    is_store_override: bool
    template_id: int | None  # Platform template ID (None if store override)
    template_code: str
    language: str


@dataclass
class BrandingContext:
    """Branding variables for email templates."""

    platform_name: str
    platform_logo_url: str | None
    support_email: str
    store_name: str | None
    store_logo_url: str | None
    is_whitelabel: bool


# =============================================================================
# EMAIL PROVIDER ABSTRACTION
# =============================================================================


class EmailProvider(ABC):
    """Abstract base class for email providers."""

    @abstractmethod
    def send(
        self,
        to_email: str,
        to_name: str | None,
        subject: str,
        body_html: str,
        body_text: str | None,
        from_email: str,
        from_name: str | None,
        reply_to: str | None = None,
    ) -> tuple[bool, str | None, str | None]:
        """
        Send an email.

        Returns:
            tuple: (success, provider_message_id, error_message)
        """


class SMTPProvider(EmailProvider):
    """SMTP email provider."""

    def send(
        self,
        to_email: str,
        to_name: str | None,
        subject: str,
        body_html: str,
        body_text: str | None,
        from_email: str,
        from_name: str | None,
        reply_to: str | None = None,
    ) -> tuple[bool, str | None, str | None]:
        try:
            msg = MIMEMultipart("alternative")
            msg["Subject"] = subject
            msg["From"] = f"{from_name} <{from_email}>" if from_name else from_email
            msg["To"] = f"{to_name} <{to_email}>" if to_name else to_email

            if reply_to:
                msg["Reply-To"] = reply_to

            # Attach text and HTML parts
            if body_text:
                msg.attach(MIMEText(body_text, "plain", "utf-8"))
            msg.attach(MIMEText(body_html, "html", "utf-8"))

            # Connect and send (10-second timeout to fail fast)
            timeout = 10
            if settings.smtp_use_ssl:
                server = smtplib.SMTP_SSL(settings.smtp_host, settings.smtp_port, timeout=timeout)
            else:
                server = smtplib.SMTP(settings.smtp_host, settings.smtp_port, timeout=timeout)

            try:
                if settings.smtp_use_tls and not settings.smtp_use_ssl:
                    server.starttls()

                if settings.smtp_user and settings.smtp_password:
                    server.login(settings.smtp_user, settings.smtp_password)

                server.sendmail(from_email, [to_email], msg.as_string())
                return True, None, None

            finally:
                server.quit()

        except Exception as e:
            logger.error(f"SMTP send error: {e}")
            return False, None, str(e)


class SendGridProvider(EmailProvider):
    """SendGrid email provider."""

    def send(
        self,
        to_email: str,
        to_name: str | None,
        subject: str,
        body_html: str,
        body_text: str | None,
        from_email: str,
        from_name: str | None,
        reply_to: str | None = None,
    ) -> tuple[bool, str | None, str | None]:
        try:
            from sendgrid import SendGridAPIClient
            from sendgrid.helpers.mail import Content, Email, Mail, To

            message = Mail(
                from_email=Email(from_email, from_name),
                to_emails=To(to_email, to_name),
                subject=subject,
            )

            message.add_content(Content("text/html", body_html))
            if body_text:
                message.add_content(Content("text/plain", body_text))

            if reply_to:
                message.reply_to = Email(reply_to)

            sg = SendGridAPIClient(settings.sendgrid_api_key)
            response = sg.send(message)

            if response.status_code in (200, 201, 202):
                message_id = response.headers.get("X-Message-Id")
                return True, message_id, None
            return False, None, f"SendGrid error: {response.status_code}"

        except ImportError:
            return False, None, "SendGrid library not installed. Run: pip install sendgrid"
        except Exception as e:
            logger.error(f"SendGrid send error: {e}")
            return False, None, str(e)


class MailgunProvider(EmailProvider):
    """Mailgun email provider."""

    def send(
        self,
        to_email: str,
        to_name: str | None,
        subject: str,
        body_html: str,
        body_text: str | None,
        from_email: str,
        from_name: str | None,
        reply_to: str | None = None,
    ) -> tuple[bool, str | None, str | None]:
        try:
            import requests

            from_str = f"{from_name} <{from_email}>" if from_name else from_email
            to_str = f"{to_name} <{to_email}>" if to_name else to_email

            data = {
                "from": from_str,
                "to": to_str,
                "subject": subject,
                "html": body_html,
            }

            if body_text:
                data["text"] = body_text
            if reply_to:
                data["h:Reply-To"] = reply_to

            response = requests.post(
                f"https://api.mailgun.net/v3/{settings.mailgun_domain}/messages",
                auth=("api", settings.mailgun_api_key),
                data=data,
                timeout=30,
            )

            if response.status_code == 200:
                result = response.json()
                return True, result.get("id"), None
            return False, None, f"Mailgun error: {response.status_code} - {response.text}"

        except Exception as e:
            logger.error(f"Mailgun send error: {e}")
            return False, None, str(e)


class SESProvider(EmailProvider):
    """Amazon SES email provider."""

    def send(
        self,
        to_email: str,
        to_name: str | None,
        subject: str,
        body_html: str,
        body_text: str | None,
        from_email: str,
        from_name: str | None,
        reply_to: str | None = None,
    ) -> tuple[bool, str | None, str | None]:
        try:
            import boto3

            ses = boto3.client(
                "ses",
                region_name=settings.aws_region,
                aws_access_key_id=settings.aws_access_key_id,
                aws_secret_access_key=settings.aws_secret_access_key,
            )

            from_str = f"{from_name} <{from_email}>" if from_name else from_email

            body = {"Html": {"Charset": "UTF-8", "Data": body_html}}
            if body_text:
                body["Text"] = {"Charset": "UTF-8", "Data": body_text}

            kwargs = {
                "Source": from_str,
                "Destination": {"ToAddresses": [to_email]},
                "Message": {
                    "Subject": {"Charset": "UTF-8", "Data": subject},
                    "Body": body,
                },
            }

            if reply_to:
                kwargs["ReplyToAddresses"] = [reply_to]

            response = ses.send_email(**kwargs)
            return True, response.get("MessageId"), None

        except ImportError:
            return False, None, "boto3 library not installed. Run: pip install boto3"
        except Exception as e:
            logger.error(f"SES send error: {e}")
            return False, None, str(e)


class DebugProvider(EmailProvider):
    """Debug provider - logs emails instead of sending."""

    def send(
        self,
        to_email: str,
        to_name: str | None,
        subject: str,
        body_html: str,
        body_text: str | None,
        from_email: str,
        from_name: str | None,
        reply_to: str | None = None,
    ) -> tuple[bool, str | None, str | None]:
        logger.info(
            f"\n{'='*60}\n"
            f"DEBUG EMAIL\n"
            f"{'='*60}\n"
            f"To: {to_name} <{to_email}>\n"
            f"From: {from_name} <{from_email}>\n"
            f"Reply-To: {reply_to}\n"
            f"Subject: {subject}\n"
            f"{'='*60}\n"
            f"Body (text):\n{body_text or '(none)'}\n"
            f"{'='*60}\n"
            f"Body (html):\n{body_html[:500]}...\n"
            f"{'='*60}\n"
        )
        return True, f"debug-{to_email}", None


# =============================================================================
# PLATFORM CONFIG HELPERS (DB overrides .env)
# =============================================================================


def get_platform_email_config(db: Session) -> dict:
    """
    Get effective platform email configuration.

    Priority: Database settings > Environment variables (.env)

    Returns:
        Dictionary with all email configuration values
    """
    from app.modules.tenancy.models import AdminSetting

    def get_db_setting(key: str) -> str | None:
        setting = db.query(AdminSetting).filter(AdminSetting.key == key).first()
        return setting.value if setting else None

    config = {}

    # Provider
    db_provider = get_db_setting("email_provider")
    config["provider"] = db_provider if db_provider else settings.email_provider

    # From settings
    db_from_email = get_db_setting("email_from_address")
    config["from_email"] = db_from_email if db_from_email else settings.email_from_address

    db_from_name = get_db_setting("email_from_name")
    config["from_name"] = db_from_name if db_from_name else settings.email_from_name

    db_reply_to = get_db_setting("email_reply_to")
    config["reply_to"] = db_reply_to if db_reply_to else settings.email_reply_to

    # SMTP settings
    db_smtp_host = get_db_setting("smtp_host")
    config["smtp_host"] = db_smtp_host if db_smtp_host else settings.smtp_host

    db_smtp_port = get_db_setting("smtp_port")
    config["smtp_port"] = int(db_smtp_port) if db_smtp_port else settings.smtp_port

    db_smtp_user = get_db_setting("smtp_user")
    config["smtp_user"] = db_smtp_user if db_smtp_user else settings.smtp_user

    db_smtp_password = get_db_setting("smtp_password")
    config["smtp_password"] = db_smtp_password if db_smtp_password else settings.smtp_password

    db_smtp_use_tls = get_db_setting("smtp_use_tls")
    config["smtp_use_tls"] = db_smtp_use_tls.lower() in ("true", "1", "yes") if db_smtp_use_tls else settings.smtp_use_tls

    db_smtp_use_ssl = get_db_setting("smtp_use_ssl")
    config["smtp_use_ssl"] = db_smtp_use_ssl.lower() in ("true", "1", "yes") if db_smtp_use_ssl else settings.smtp_use_ssl

    # SendGrid
    db_sendgrid_key = get_db_setting("sendgrid_api_key")
    config["sendgrid_api_key"] = db_sendgrid_key if db_sendgrid_key else settings.sendgrid_api_key

    # Mailgun
    db_mailgun_key = get_db_setting("mailgun_api_key")
    config["mailgun_api_key"] = db_mailgun_key if db_mailgun_key else settings.mailgun_api_key

    db_mailgun_domain = get_db_setting("mailgun_domain")
    config["mailgun_domain"] = db_mailgun_domain if db_mailgun_domain else settings.mailgun_domain

    # AWS SES
    db_aws_key = get_db_setting("aws_access_key_id")
    config["aws_access_key_id"] = db_aws_key if db_aws_key else settings.aws_access_key_id

    db_aws_secret = get_db_setting("aws_secret_access_key")
    config["aws_secret_access_key"] = db_aws_secret if db_aws_secret else settings.aws_secret_access_key

    db_aws_region = get_db_setting("aws_region")
    config["aws_region"] = db_aws_region if db_aws_region else settings.aws_region

    # Behavior
    db_enabled = get_db_setting("email_enabled")
    config["enabled"] = db_enabled.lower() in ("true", "1", "yes") if db_enabled else settings.email_enabled

    db_debug = get_db_setting("email_debug")
    config["debug"] = db_debug.lower() in ("true", "1", "yes") if db_debug else settings.email_debug

    return config


# =============================================================================
# CONFIGURABLE PLATFORM PROVIDERS (use config dict instead of global settings)
# =============================================================================


class ConfigurableSMTPProvider(EmailProvider):
    """SMTP provider using config dictionary."""

    def __init__(self, config: dict):
        self.config = config

    def send(
        self,
        to_email: str,
        to_name: str | None,
        subject: str,
        body_html: str,
        body_text: str | None,
        from_email: str,
        from_name: str | None,
        reply_to: str | None = None,
    ) -> tuple[bool, str | None, str | None]:
        try:
            msg = MIMEMultipart("alternative")
            msg["Subject"] = subject
            msg["From"] = f"{from_name} <{from_email}>" if from_name else from_email
            msg["To"] = f"{to_name} <{to_email}>" if to_name else to_email

            if reply_to:
                msg["Reply-To"] = reply_to

            if body_text:
                msg.attach(MIMEText(body_text, "plain", "utf-8"))
            msg.attach(MIMEText(body_html, "html", "utf-8"))

            # Use 10-second timeout to fail fast on bad SMTP settings
            timeout = 10
            if self.config.get("smtp_use_ssl"):
                server = smtplib.SMTP_SSL(self.config["smtp_host"], self.config["smtp_port"], timeout=timeout)
            else:
                server = smtplib.SMTP(self.config["smtp_host"], self.config["smtp_port"], timeout=timeout)

            try:
                if self.config.get("smtp_use_tls") and not self.config.get("smtp_use_ssl"):
                    server.starttls()

                if self.config.get("smtp_user") and self.config.get("smtp_password"):
                    server.login(self.config["smtp_user"], self.config["smtp_password"])

                server.sendmail(from_email, [to_email], msg.as_string())
                return True, None, None

            finally:
                server.quit()

        except Exception as e:
            logger.error(f"Configurable SMTP send error: {e}")
            return False, None, str(e)


class ConfigurableSendGridProvider(EmailProvider):
    """SendGrid provider using config dictionary."""

    def __init__(self, config: dict):
        self.config = config

    def send(
        self,
        to_email: str,
        to_name: str | None,
        subject: str,
        body_html: str,
        body_text: str | None,
        from_email: str,
        from_name: str | None,
        reply_to: str | None = None,
    ) -> tuple[bool, str | None, str | None]:
        try:
            from sendgrid import SendGridAPIClient
            from sendgrid.helpers.mail import Content, Email, Mail, To

            message = Mail(
                from_email=Email(from_email, from_name),
                to_emails=To(to_email, to_name),
                subject=subject,
            )

            message.add_content(Content("text/html", body_html))
            if body_text:
                message.add_content(Content("text/plain", body_text))

            if reply_to:
                message.reply_to = Email(reply_to)

            sg = SendGridAPIClient(self.config["sendgrid_api_key"])
            response = sg.send(message)

            if response.status_code in (200, 201, 202):
                message_id = response.headers.get("X-Message-Id")
                return True, message_id, None
            return False, None, f"SendGrid error: {response.status_code}"

        except ImportError:
            return False, None, "SendGrid library not installed"
        except Exception as e:
            logger.error(f"Configurable SendGrid send error: {e}")
            return False, None, str(e)


class ConfigurableMailgunProvider(EmailProvider):
    """Mailgun provider using config dictionary."""

    def __init__(self, config: dict):
        self.config = config

    def send(
        self,
        to_email: str,
        to_name: str | None,
        subject: str,
        body_html: str,
        body_text: str | None,
        from_email: str,
        from_name: str | None,
        reply_to: str | None = None,
    ) -> tuple[bool, str | None, str | None]:
        try:
            import requests

            from_str = f"{from_name} <{from_email}>" if from_name else from_email
            to_str = f"{to_name} <{to_email}>" if to_name else to_email

            data = {
                "from": from_str,
                "to": to_str,
                "subject": subject,
                "html": body_html,
            }

            if body_text:
                data["text"] = body_text
            if reply_to:
                data["h:Reply-To"] = reply_to

            response = requests.post(
                f"https://api.mailgun.net/v3/{self.config['mailgun_domain']}/messages",
                auth=("api", self.config["mailgun_api_key"]),
                data=data,
                timeout=30,
            )

            if response.status_code == 200:
                result = response.json()
                return True, result.get("id"), None
            return False, None, f"Mailgun error: {response.status_code} - {response.text}"

        except Exception as e:
            logger.error(f"Configurable Mailgun send error: {e}")
            return False, None, str(e)


class ConfigurableSESProvider(EmailProvider):
    """Amazon SES provider using config dictionary."""

    def __init__(self, config: dict):
        self.config = config

    def send(
        self,
        to_email: str,
        to_name: str | None,
        subject: str,
        body_html: str,
        body_text: str | None,
        from_email: str,
        from_name: str | None,
        reply_to: str | None = None,
    ) -> tuple[bool, str | None, str | None]:
        try:
            import boto3

            ses = boto3.client(
                "ses",
                region_name=self.config["aws_region"],
                aws_access_key_id=self.config["aws_access_key_id"],
                aws_secret_access_key=self.config["aws_secret_access_key"],
            )

            from_str = f"{from_name} <{from_email}>" if from_name else from_email

            body = {"Html": {"Charset": "UTF-8", "Data": body_html}}
            if body_text:
                body["Text"] = {"Charset": "UTF-8", "Data": body_text}

            kwargs = {
                "Source": from_str,
                "Destination": {"ToAddresses": [to_email]},
                "Message": {
                    "Subject": {"Charset": "UTF-8", "Data": subject},
                    "Body": body,
                },
            }

            if reply_to:
                kwargs["ReplyToAddresses"] = [reply_to]

            response = ses.send_email(**kwargs)
            return True, response.get("MessageId"), None

        except ImportError:
            return False, None, "boto3 library not installed"
        except Exception as e:
            logger.error(f"Configurable SES send error: {e}")
            return False, None, str(e)


def get_platform_provider(db: Session) -> EmailProvider:
    """
    Get the configured email provider using effective platform config.

    Uses database settings if available, otherwise falls back to .env.
    """
    config = get_platform_email_config(db)

    if config.get("debug"):
        return DebugProvider()

    provider_map = {
        "smtp": ConfigurableSMTPProvider,
        "sendgrid": ConfigurableSendGridProvider,
        "mailgun": ConfigurableMailgunProvider,
        "ses": ConfigurableSESProvider,
    }

    provider_name = config.get("provider", "smtp").lower()
    provider_class = provider_map.get(provider_name)

    if not provider_class:
        logger.warning(f"Unknown email provider: {provider_name}, using SMTP")
        return ConfigurableSMTPProvider(config)

    return provider_class(config)


# =============================================================================
# STORE EMAIL PROVIDERS
# =============================================================================


class StoreSMTPProvider(EmailProvider):
    """SMTP provider using store-specific settings."""

    def __init__(self, store_settings):
        self.settings = store_settings

    def send(
        self,
        to_email: str,
        to_name: str | None,
        subject: str,
        body_html: str,
        body_text: str | None,
        from_email: str,
        from_name: str | None,
        reply_to: str | None = None,
    ) -> tuple[bool, str | None, str | None]:
        try:
            msg = MIMEMultipart("alternative")
            msg["Subject"] = subject
            msg["From"] = f"{from_name} <{from_email}>" if from_name else from_email
            msg["To"] = f"{to_name} <{to_email}>" if to_name else to_email

            if reply_to:
                msg["Reply-To"] = reply_to

            if body_text:
                msg.attach(MIMEText(body_text, "plain", "utf-8"))
            msg.attach(MIMEText(body_html, "html", "utf-8"))

            # Use store's SMTP settings (10-second timeout to fail fast)
            timeout = 10
            if self.settings.smtp_use_ssl:
                server = smtplib.SMTP_SSL(self.settings.smtp_host, self.settings.smtp_port, timeout=timeout)
            else:
                server = smtplib.SMTP(self.settings.smtp_host, self.settings.smtp_port, timeout=timeout)

            try:
                if self.settings.smtp_use_tls and not self.settings.smtp_use_ssl:
                    server.starttls()

                if self.settings.smtp_username and self.settings.smtp_password:
                    server.login(self.settings.smtp_username, self.settings.smtp_password)

                server.sendmail(from_email, [to_email], msg.as_string())
                return True, None, None

            finally:
                server.quit()

        except Exception as e:
            logger.error(f"Store SMTP send error: {e}")
            return False, None, str(e)


class StoreSendGridProvider(EmailProvider):
    """SendGrid provider using store-specific API key."""

    def __init__(self, store_settings):
        self.settings = store_settings

    def send(
        self,
        to_email: str,
        to_name: str | None,
        subject: str,
        body_html: str,
        body_text: str | None,
        from_email: str,
        from_name: str | None,
        reply_to: str | None = None,
    ) -> tuple[bool, str | None, str | None]:
        try:
            from sendgrid import SendGridAPIClient
            from sendgrid.helpers.mail import Content, Email, Mail, To

            message = Mail(
                from_email=Email(from_email, from_name),
                to_emails=To(to_email, to_name),
                subject=subject,
            )

            message.add_content(Content("text/html", body_html))
            if body_text:
                message.add_content(Content("text/plain", body_text))

            if reply_to:
                message.reply_to = Email(reply_to)

            sg = SendGridAPIClient(self.settings.sendgrid_api_key)
            response = sg.send(message)

            if response.status_code in (200, 201, 202):
                message_id = response.headers.get("X-Message-Id")
                return True, message_id, None
            return False, None, f"SendGrid error: {response.status_code}"

        except ImportError:
            return False, None, "SendGrid library not installed"
        except Exception as e:
            logger.error(f"Store SendGrid send error: {e}")
            return False, None, str(e)


class StoreMailgunProvider(EmailProvider):
    """Mailgun provider using store-specific settings."""

    def __init__(self, store_settings):
        self.settings = store_settings

    def send(
        self,
        to_email: str,
        to_name: str | None,
        subject: str,
        body_html: str,
        body_text: str | None,
        from_email: str,
        from_name: str | None,
        reply_to: str | None = None,
    ) -> tuple[bool, str | None, str | None]:
        try:
            import requests

            from_str = f"{from_name} <{from_email}>" if from_name else from_email
            to_str = f"{to_name} <{to_email}>" if to_name else to_email

            data = {
                "from": from_str,
                "to": to_str,
                "subject": subject,
                "html": body_html,
            }

            if body_text:
                data["text"] = body_text
            if reply_to:
                data["h:Reply-To"] = reply_to

            response = requests.post(
                f"https://api.mailgun.net/v3/{self.settings.mailgun_domain}/messages",
                auth=("api", self.settings.mailgun_api_key),
                data=data,
                timeout=30,
            )

            if response.status_code == 200:
                result = response.json()
                return True, result.get("id"), None
            return False, None, f"Mailgun error: {response.status_code} - {response.text}"

        except Exception as e:
            logger.error(f"Store Mailgun send error: {e}")
            return False, None, str(e)


class StoreSESProvider(EmailProvider):
    """Amazon SES provider using store-specific credentials."""

    def __init__(self, store_settings):
        self.settings = store_settings

    def send(
        self,
        to_email: str,
        to_name: str | None,
        subject: str,
        body_html: str,
        body_text: str | None,
        from_email: str,
        from_name: str | None,
        reply_to: str | None = None,
    ) -> tuple[bool, str | None, str | None]:
        try:
            import boto3

            ses = boto3.client(
                "ses",
                region_name=self.settings.ses_region,
                aws_access_key_id=self.settings.ses_access_key_id,
                aws_secret_access_key=self.settings.ses_secret_access_key,
            )

            from_str = f"{from_name} <{from_email}>" if from_name else from_email

            body = {"Html": {"Charset": "UTF-8", "Data": body_html}}
            if body_text:
                body["Text"] = {"Charset": "UTF-8", "Data": body_text}

            kwargs = {
                "Source": from_str,
                "Destination": {"ToAddresses": [to_email]},
                "Message": {
                    "Subject": {"Charset": "UTF-8", "Data": subject},
                    "Body": body,
                },
            }

            if reply_to:
                kwargs["ReplyToAddresses"] = [reply_to]

            response = ses.send_email(**kwargs)
            return True, response.get("MessageId"), None

        except ImportError:
            return False, None, "boto3 library not installed"
        except Exception as e:
            logger.error(f"Store SES send error: {e}")
            return False, None, str(e)


def get_store_provider(store_settings) -> EmailProvider | None:
    """
    Create an email provider instance using store's settings.

    Args:
        store_settings: StoreEmailSettings model instance

    Returns:
        EmailProvider instance or None if not configured
    """
    if not store_settings or not store_settings.is_configured:
        return None

    provider_map = {
        "smtp": StoreSMTPProvider,
        "sendgrid": StoreSendGridProvider,
        "mailgun": StoreMailgunProvider,
        "ses": StoreSESProvider,
    }

    provider_class = provider_map.get(store_settings.provider)
    if not provider_class:
        logger.warning(f"Unknown store email provider: {store_settings.provider}")
        return None

    return provider_class(store_settings)


# =============================================================================
# PLATFORM EMAIL PROVIDER
# =============================================================================


def get_provider() -> EmailProvider:
    """Get the configured email provider."""
    if settings.email_debug:
        return DebugProvider()

    provider_map = {
        "smtp": SMTPProvider,
        "sendgrid": SendGridProvider,
        "mailgun": MailgunProvider,
        "ses": SESProvider,
    }

    provider_class = provider_map.get(settings.email_provider.lower())
    if not provider_class:
        logger.warning(f"Unknown email provider: {settings.email_provider}, using SMTP")
        return SMTPProvider()

    return provider_class()


class EmailService:
    """
    Email service for sending templated emails.

    Usage:
        email_service = EmailService(db)

        # Send using database template with store override support
        email_service.send_template(
            template_code="signup_welcome",
            to_email="user@example.com",
            to_name="John Doe",
            variables={"first_name": "John", "login_url": "https://..."},
            store_id=1,
            # Language is resolved automatically from store/customer settings
        )

        # Send raw email
        email_service.send_raw(
            to_email="user@example.com",
            subject="Hello",
            body_html="<h1>Hello</h1>",
        )

    Platform email configuration is loaded from:
    1. Database (admin_settings table) - if settings exist
    2. Environment variables (.env) - fallback
    """

    def __init__(self, db: Session):
        self.db = db
        # Use configurable provider that checks DB first, then .env
        self.provider = get_platform_provider(db)
        # Cache the platform config for use in send_raw
        self._platform_config = get_platform_email_config(db)
        self.jinja_env = Environment(loader=BaseLoader())
        # Cache store and feature data to avoid repeated queries
        self._store_cache: dict[int, Any] = {}
        self._feature_cache: dict[int, set[str]] = {}
        self._store_email_settings_cache: dict[int, Any] = {}
        self._store_tier_cache: dict[int, str | None] = {}

    def _get_store(self, store_id: int):
        """Get store with caching."""
        if store_id not in self._store_cache:
            from app.modules.tenancy.models import Store

            self._store_cache[store_id] = (
                self.db.query(Store).filter(Store.id == store_id).first()
            )
        return self._store_cache[store_id]

    def _has_feature(self, store_id: int, feature_code: str) -> bool:
        """Check if store has a specific feature enabled."""
        if store_id not in self._feature_cache:
            from app.modules.billing.services.feature_service import feature_service

            try:
                features = feature_service.get_store_features(self.db, store_id)
                # Convert to set of feature codes
                self._feature_cache[store_id] = {f.code for f in features.features}
            except Exception:
                self._feature_cache[store_id] = set()

        return feature_code in self._feature_cache[store_id]

    def _get_store_email_settings(self, store_id: int):
        """Get store email settings with caching."""
        if store_id not in self._store_email_settings_cache:
            from app.modules.messaging.models import StoreEmailSettings

            self._store_email_settings_cache[store_id] = (
                self.db.query(StoreEmailSettings)
                .filter(StoreEmailSettings.store_id == store_id)
                .first()
            )
        return self._store_email_settings_cache[store_id]

    def _get_store_tier(self, store_id: int) -> str | None:
        """Get store's subscription tier with caching."""
        if store_id not in self._store_tier_cache:
            from app.modules.billing.services.subscription_service import (
                subscription_service,
            )

            tier = subscription_service.get_current_tier(self.db, store_id)
            self._store_tier_cache[store_id] = tier.value if tier else None
        return self._store_tier_cache[store_id]

    def _should_add_powered_by_footer(self, store_id: int | None) -> bool:
        """
        Check if "Powered by Wizamart" footer should be added.

        Footer is added for Essential and Professional tiers.
        Business and Enterprise tiers get white-label (no footer).
        """
        if not store_id:
            return False  # Platform emails don't get the footer

        tier = self._get_store_tier(store_id)
        if not tier:
            return True  # No tier = show footer (shouldn't happen normally)

        return tier.lower() not in WHITELABEL_TIERS

    def _inject_powered_by_footer(
        self,
        body_html: str,
        body_text: str | None,
        store_id: int | None,
    ) -> tuple[str, str | None]:
        """
        Inject "Powered by Wizamart" footer if needed based on tier.

        Returns:
            Tuple of (modified_html, modified_text)
        """
        if not self._should_add_powered_by_footer(store_id):
            return body_html, body_text

        # Inject footer before closing </body> tag if present, otherwise append
        if "</body>" in body_html.lower():
            # Find </body> case-insensitively and inject before it
            import re
            body_html = re.sub(
                r"(</body>)",
                f"{POWERED_BY_FOOTER_HTML}\\1",
                body_html,
                flags=re.IGNORECASE,
            )
        else:
            body_html += POWERED_BY_FOOTER_HTML

        if body_text:
            body_text += POWERED_BY_FOOTER_TEXT

        return body_html, body_text

    def resolve_language(
        self,
        explicit_language: str | None = None,
        store_id: int | None = None,
        customer_id: int | None = None,
    ) -> str:
        """
        Resolve the language for an email.

        Priority order:
        1. Explicit language parameter
        2. Customer's preferred language (if customer_id provided)
        3. Store's storefront language (if store_id provided)
        4. Platform default (en)

        Args:
            explicit_language: Explicitly requested language
            store_id: Store ID for storefront language lookup
            customer_id: Customer ID for preferred language lookup

        Returns:
            Resolved language code (one of: en, fr, de, lb)
        """
        # 1. Explicit language takes priority
        if explicit_language and explicit_language in SUPPORTED_LANGUAGES:
            return explicit_language

        # 2. Customer's preferred language
        if customer_id:
            from app.modules.customers.models.customer import Customer

            customer = (
                self.db.query(Customer).filter(Customer.id == customer_id).first()
            )
            if customer and customer.preferred_language in SUPPORTED_LANGUAGES:
                return customer.preferred_language

        # 3. Store's storefront language
        if store_id:
            store = self._get_store(store_id)
            if store and store.storefront_language in SUPPORTED_LANGUAGES:
                return store.storefront_language

        # 4. Platform default
        return PLATFORM_DEFAULT_LANGUAGE

    def get_branding(self, store_id: int | None = None) -> BrandingContext:
        """
        Get branding context for email templates.

        If store has white_label feature enabled (Enterprise tier),
        platform branding is replaced with store branding.

        Args:
            store_id: Optional store ID

        Returns:
            BrandingContext with appropriate branding variables
        """
        store = None
        is_whitelabel = False

        if store_id:
            store = self._get_store(store_id)
            is_whitelabel = self._has_feature(store_id, "white_label")

        if is_whitelabel and store:
            # Whitelabel: use store branding throughout
            return BrandingContext(
                platform_name=store.name,
                platform_logo_url=store.get_logo_url(),
                support_email=store.support_email or PLATFORM_SUPPORT_EMAIL,
                store_name=store.name,
                store_logo_url=store.get_logo_url(),
                is_whitelabel=True,
            )
        # Standard: Wizamart branding with store details
        return BrandingContext(
            platform_name=PLATFORM_NAME,
            platform_logo_url=None,  # Use default platform logo
            support_email=PLATFORM_SUPPORT_EMAIL,
            store_name=store.name if store else None,
            store_logo_url=store.get_logo_url() if store else None,
            is_whitelabel=False,
        )

    def resolve_template(
        self,
        template_code: str,
        language: str,
        store_id: int | None = None,
    ) -> ResolvedTemplate | None:
        """
        Resolve template content with store override support.

        Resolution order:
        1. Check for store override (if store_id and template is not platform-only)
        2. Fall back to platform template
        3. Fall back to English if language not found

        Args:
            template_code: Template code (e.g., "password_reset")
            language: Language code
            store_id: Optional store ID for override lookup

        Returns:
            ResolvedTemplate with content, or None if not found
        """
        # First, get platform template to check if it's platform-only
        platform_template = self.get_template(template_code, language)

        if not platform_template:
            logger.warning(f"Template not found: {template_code} ({language})")
            return None

        # Check for store override (if not platform-only)
        if store_id and not platform_template.is_platform_only:
            store_override = StoreEmailTemplate.get_override(
                self.db, store_id, template_code, language
            )

            if store_override:
                return ResolvedTemplate(
                    subject=store_override.subject,
                    body_html=store_override.body_html,
                    body_text=store_override.body_text,
                    is_store_override=True,
                    template_id=None,
                    template_code=template_code,
                    language=language,
                )

        # Use platform template
        return ResolvedTemplate(
            subject=platform_template.subject,
            body_html=platform_template.body_html,
            body_text=platform_template.body_text,
            is_store_override=False,
            template_id=platform_template.id,
            template_code=template_code,
            language=language,
        )

    def get_template(
        self, template_code: str, language: str = "en"
    ) -> EmailTemplate | None:
        """Get platform email template from database with fallback to English."""
        template = (
            self.db.query(EmailTemplate)
            .filter(
                EmailTemplate.code == template_code,
                EmailTemplate.language == language,
                EmailTemplate.is_active == True,  # noqa: E712
            )
            .first()
        )

        # Fallback to English if not found
        if not template and language != "en":
            template = (
                self.db.query(EmailTemplate)
                .filter(
                    EmailTemplate.code == template_code,
                    EmailTemplate.language == "en",
                    EmailTemplate.is_active == True,  # noqa: E712
                )
                .first()
            )

        return template

    def render_template(self, template_string: str, variables: dict[str, Any]) -> str:
        """Render a Jinja2 template string with variables."""
        try:
            template = self.jinja_env.from_string(template_string)
            return template.render(**variables)
        except Exception as e:
            logger.error(f"Template rendering error: {e}")
            return template_string

    def send_template(
        self,
        template_code: str,
        to_email: str,
        to_name: str | None = None,
        language: str | None = None,
        variables: dict[str, Any] | None = None,
        store_id: int | None = None,
        customer_id: int | None = None,
        user_id: int | None = None,
        related_type: str | None = None,
        related_id: int | None = None,
        include_branding: bool = True,
    ) -> EmailLog:
        """
        Send an email using a database template with store override support.

        Args:
            template_code: Template code (e.g., "signup_welcome")
            to_email: Recipient email address
            to_name: Recipient name (optional)
            language: Language code (auto-resolved if None)
            variables: Template variables dict
            store_id: Store ID for override lookup and logging
            customer_id: Customer ID for language resolution
            user_id: Related user ID for logging
            related_type: Related entity type (e.g., "order")
            related_id: Related entity ID
            include_branding: Whether to inject branding variables (default: True)

        Returns:
            EmailLog record
        """
        variables = variables or {}

        # Resolve language (uses customer -> store -> platform default order)
        resolved_language = self.resolve_language(
            explicit_language=language,
            store_id=store_id,
            customer_id=customer_id,
        )

        # Resolve template (checks store override, falls back to platform)
        resolved = self.resolve_template(template_code, resolved_language, store_id)

        if not resolved:
            logger.error(f"Email template not found: {template_code} ({resolved_language})")
            # Create failed log entry
            log = EmailLog(
                template_code=template_code,
                recipient_email=to_email,
                recipient_name=to_name,
                subject=f"[Template not found: {template_code}]",
                from_email=settings.email_from_address,
                from_name=settings.email_from_name,
                status=EmailStatus.FAILED.value,
                error_message=f"Template not found: {template_code} ({resolved_language})",
                provider=settings.email_provider,
                store_id=store_id,
                user_id=user_id,
                related_type=related_type,
                related_id=related_id,
            )
            self.db.add(log)
            self.db.commit()  # noqa: SVC-006 - Email logs are side effects, commit immediately
            return log

        # Inject branding variables if requested
        if include_branding:
            branding = self.get_branding(store_id)
            variables = {
                **variables,
                "platform_name": branding.platform_name,
                "platform_logo_url": branding.platform_logo_url,
                "support_email": branding.support_email,
                "store_name": branding.store_name,
                "store_logo_url": branding.store_logo_url,
                "is_whitelabel": branding.is_whitelabel,
            }

        # Render template
        subject = self.render_template(resolved.subject, variables)
        body_html = self.render_template(resolved.body_html, variables)
        body_text = (
            self.render_template(resolved.body_text, variables)
            if resolved.body_text
            else None
        )

        return self.send_raw(
            to_email=to_email,
            to_name=to_name,
            subject=subject,
            body_html=body_html,
            body_text=body_text,
            template_code=template_code,
            template_id=resolved.template_id,
            store_id=store_id,
            user_id=user_id,
            related_type=related_type,
            related_id=related_id,
            extra_data=json.dumps(variables) if variables else None,
        )

    def send_raw(
        self,
        to_email: str,
        subject: str,
        body_html: str,
        to_name: str | None = None,
        body_text: str | None = None,
        from_email: str | None = None,
        from_name: str | None = None,
        reply_to: str | None = None,
        template_code: str | None = None,
        template_id: int | None = None,
        store_id: int | None = None,
        user_id: int | None = None,
        related_type: str | None = None,
        related_id: int | None = None,
        extra_data: str | None = None,
        is_platform_email: bool = False,
    ) -> EmailLog:
        """
        Send a raw email without using a template.

        For store emails (when store_id is provided and is_platform_email=False):
        - Uses store's SMTP/provider settings if configured
        - Uses store's from_email, from_name, reply_to
        - Adds "Powered by Wizamart" footer for Essential/Professional tiers

        For platform emails (is_platform_email=True or no store_id):
        - Uses platform's email settings from config
        - No "Powered by Wizamart" footer

        Args:
            is_platform_email: If True, always use platform settings (for billing, etc.)

        Returns:
            EmailLog record
        """
        # Determine which provider and settings to use
        store_settings = None
        store_provider = None
        provider_name = self._platform_config.get("provider", settings.email_provider)

        if store_id and not is_platform_email:
            store_settings = self._get_store_email_settings(store_id)
            if store_settings and store_settings.is_configured:
                store_provider = get_store_provider(store_settings)
                if store_provider:
                    # Use store's email identity
                    from_email = from_email or store_settings.from_email
                    from_name = from_name or store_settings.from_name
                    reply_to = reply_to or store_settings.reply_to_email
                    provider_name = f"store_{store_settings.provider}"
                    logger.debug(f"Using store email provider: {store_settings.provider}")

        # Fall back to platform settings if no store provider
        # Uses DB config if available, otherwise .env
        if not store_provider:
            from_email = from_email or self._platform_config.get("from_email", settings.email_from_address)
            from_name = from_name or self._platform_config.get("from_name", settings.email_from_name)
            reply_to = reply_to or self._platform_config.get("reply_to") or settings.email_reply_to or None

        # Inject "Powered by Wizamart" footer for non-whitelabel tiers
        if store_id and not is_platform_email:
            body_html, body_text = self._inject_powered_by_footer(
                body_html, body_text, store_id
            )

        # Create log entry
        log = EmailLog(
            template_code=template_code,
            template_id=template_id,
            recipient_email=to_email,
            recipient_name=to_name,
            subject=subject,
            body_html=body_html,
            body_text=body_text,
            from_email=from_email,
            from_name=from_name,
            reply_to=reply_to,
            status=EmailStatus.PENDING.value,
            provider=provider_name,
            store_id=store_id,
            user_id=user_id,
            related_type=related_type,
            related_id=related_id,
            extra_data=extra_data,
        )
        self.db.add(log)
        self.db.flush()

        # Check if emails are disabled (uses DB config if available)
        email_enabled = self._platform_config.get("enabled", settings.email_enabled)
        if not email_enabled:
            log.status = EmailStatus.FAILED.value
            log.error_message = "Email sending is disabled"
            self.db.commit()  # noqa: SVC-006 - Email logs are side effects, commit immediately
            logger.info(f"Email sending disabled, skipping: {to_email}")
            return log

        # Use store provider if available, otherwise platform provider
        provider_to_use = store_provider or self.provider

        # Send email
        success, message_id, error = provider_to_use.send(
            to_email=to_email,
            to_name=to_name,
            subject=subject,
            body_html=body_html,
            body_text=body_text,
            from_email=from_email,
            from_name=from_name,
            reply_to=reply_to,
        )

        if success:
            log.mark_sent(message_id)
            logger.info(f"Email sent to {to_email}: {subject} (via {provider_name})")
        else:
            log.mark_failed(error or "Unknown error")
            logger.error(f"Email failed to {to_email}: {error}")

        self.db.commit()  # noqa: SVC-006 - Email logs are side effects, commit immediately
        return log


# =============================================================================
# CONVENIENCE FUNCTIONS
# =============================================================================


def send_email(
    db: Session,
    template_code: str,
    to_email: str,
    to_name: str | None = None,
    language: str | None = None,
    variables: dict[str, Any] | None = None,
    store_id: int | None = None,
    customer_id: int | None = None,
    **kwargs,
) -> EmailLog:
    """
    Convenience function to send a templated email.

    Args:
        db: Database session
        template_code: Template code (e.g., "password_reset")
        to_email: Recipient email address
        to_name: Recipient name (optional)
        language: Language code (auto-resolved from customer/store if None)
        variables: Template variables dict
        store_id: Store ID for override lookup and branding
        customer_id: Customer ID for language resolution
        **kwargs: Additional arguments passed to send_template

    Returns:
        EmailLog record
    """
    service = EmailService(db)
    return service.send_template(
        template_code=template_code,
        to_email=to_email,
        to_name=to_name,
        language=language,
        variables=variables,
        store_id=store_id,
        customer_id=customer_id,
        **kwargs,
    )