"""
Notifier - Email and Webhook Notifications
Handles SMTP emails (Mailgun) and outgoing webhooks
Compatible with Python 3.6+
"""

import requests
import logging
import smtplib
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart
from jinja2 import Template

logger = logging.getLogger('Notifier')

class Notifier:
    def __init__(self, config):
        self.config = config
        self.enabled = config['notifications']['enabled']

        # SMTP configuration (preferred method)
        smtp_config = config['notifications'].get('smtp', {})
        self.smtp_server = smtp_config.get('server')
        self.smtp_port = smtp_config.get('port', 587)
        self.smtp_user = smtp_config.get('user')
        self.smtp_password = smtp_config.get('password')
        self.sender_email = smtp_config.get('sender_email')

        self.recipients = config['notifications']['recipients']
        self.webhook_config = config.get('webhooks', {})

    def send_email(self, template_name, recipients, data):
        """
        Send email via SMTP (Mailgun)

        Args:
            template_name: Name of email template
            recipients: List of email addresses or single email
            data: Template data dict
        """
        if not self.enabled:
            logger.info("Notifications disabled, skipping email")
            return

        if not self.smtp_server or not self.smtp_user:
            logger.warning("SMTP not configured, skipping email")
            return

        try:
            # Simple templates (full template system would load from YAML)
            templates = {
                'a1_to_a2_complete': {
                    'subject': "✅ Master Assets Downloaded - Campaign {campaign_name}",
                    'html': """
                        <h2>Master Assets Downloaded Successfully</h2>
                        <p><strong>Campaign:</strong> {{ campaign_name }} ({{ campaign_id }})</p>
                        <p><strong>Campaign Number:</strong> {{ campaign_number }}</p>
                        <p><strong>Assets Downloaded:</strong> {{ asset_count }}</p>
                        <p><strong>Status Updated:</strong> A1 → A2</p>
                        <hr>

                        <h3>Processed Assets:</h3>
                        <ul>
                        {% for asset in processed_assets %}
                            <li><strong>{{ asset.asset_name }}</strong>
                                <br>Tracking ID: <code>{{ asset.tracking_id }}</code>
                                <br>Box File ID: {{ asset.box_file_id }}
                                <br>Box URL: <a href="{{ asset.box_url }}">{{ asset.box_url }}</a>
                            </li>
                        {% endfor %}
                        </ul>

                        <hr>
                        <p>All assets have been downloaded from DAM and uploaded to Box with tracking IDs.</p>
                        <p>Campaign status has been updated from A1 to A2.</p>
                    """
                },
                'a2_to_a3_complete': {
                    'subject': "✅ Localized Assets Uploaded - Campaign {campaign_name}",
                    'html': """
                        <h2>Localized Assets Uploaded Successfully</h2>
                        <p><strong>Campaign:</strong> {{ campaign_name }}</p>
                        <p><strong>Campaign ID:</strong> {{ campaign_id }}</p>
                        <p><strong>Assets Uploaded:</strong> {{ asset_count }}</p>
                        <p><strong>Status Updated:</strong> A2 → A3</p>
                        <hr>
                        <p>All localized assets have been uploaded to DAM.</p>
                    """
                },
                'upload_failed': {
                    'subject': "❌ Upload Failed - {filename}",
                    'html': """
                        <h2 style="color: red;">Upload Failed</h2>
                        <p><strong>Filename:</strong> {{ filename }}</p>
                        <p><strong>Tracking ID:</strong> {{ tracking_id }}</p>
                        <p><strong>Error:</strong> {{ error }}</p>
                        <hr>
                        <p>Please investigate the error.</p>
                    """
                },
                'a1_to_a2_partial': {
                    'subject': "⚠️ Partial Download - Campaign {campaign_name}",
                    'html': """
                        <h2 style="color: orange;">Campaign Partially Processed</h2>
                        <p><strong>Campaign:</strong> {{ campaign_name }} ({{ campaign_id }})</p>
                        <p><strong>Campaign Number:</strong> {{ campaign_number }}</p>
                        <p><strong>Total Assets:</strong> {{ total_assets }}</p>
                        <p><strong>Successful:</strong> {{ successful }}</p>
                        <p><strong>Failed:</strong> {{ failed }}</p>
                        <hr>

                        {% if successful > 0 %}
                        <h3 style="color: green;">✅ Successfully Processed ({{ successful }}):</h3>
                        <ul>
                        {% for asset in processed_assets %}
                            <li><strong>{{ asset.asset_name }}</strong>
                                <br>Tracking ID: <code>{{ asset.tracking_id }}</code>
                                <br>Box File ID: {{ asset.box_file_id }}
                                <br>Box URL: <a href="{{ asset.box_url }}">{{ asset.box_url }}</a>
                            </li>
                        {% endfor %}
                        </ul>
                        {% endif %}

                        {% if failed > 0 %}
                        <h3 style="color: red;">❌ Failed Assets ({{ failed }}):</h3>
                        <ul>
                        {% for asset in failed_assets %}
                            <li><strong>{{ asset.asset_name }}</strong>
                                <br><span style="color: red;">Error: {{ asset.error }}</span>
                            </li>
                        {% endfor %}
                        </ul>
                        {% endif %}

                        <hr>
                        <p style="color: red;"><strong>Status NOT updated.</strong> Campaign remains at A1.</p>
                        <p>The script will retry failed assets on the next run (every 5 minutes).</p>
                    """
                },
                'a2_to_a3_file_uploaded': {
                    'subject': "✅ Asset Uploaded to DAM - {clean_filename}",
                    'html': """
                        <h2>Asset Uploaded Successfully (A2→A3)</h2>

                        <h3>File Details:</h3>
                        <p><strong>Original Filename (from Box):</strong><br>
                           <code>{{ filename }}</code></p>
                        <p><strong>Clean Filename (in DAM):</strong><br>
                           <code>{{ clean_filename }}</code></p>
                        <p><strong>DAM Asset ID:</strong> <code>{{ asset_id }}</code></p>
                        <p><strong>Tracking ID:</strong> <code>{{ tracking_id }}</code></p>

                        <hr>

                        <h3>Processing Details:</h3>
                        <p><strong>Master Asset ID:</strong> {{ master_asset_name }}</p>
                        <p><strong>Uploaded to DAM Folder:</strong> {{ upload_folder }}</p>
                        <p><strong>Downloaded from Box Folder:</strong> {{ box_folder }}</p>

                        <hr>

                        <h3>What Was Done:</h3>
                        <ul>
                            <li>✅ Downloaded from Box processing folder (348526703108)</li>
                            <li>✅ Loaded master metadata from database ({{ tracking_id }})</li>
                            <li>✅ Built asset representation with 27 MVP fields</li>
                            <li>✅ Updated Description from filename</li>
                            <li>✅ Updated Language from filename</li>
                            <li>✅ Set State to "Local"</li>
                            <li>✅ Stripped OMG Job Number and Tracking ID from filename</li>
                            <li>✅ Uploaded to DAM Final Assets folder</li>
                            <li>✅ <strong>Deleted file from Box</strong></li>
                        </ul>

                        <hr>
                        <p><strong>Status:</strong> Asset processing complete.</p>
                        <p><em>Note: Campaign status will be updated to A3 once all assets are uploaded.</em></p>
                    """
                }
            }

            template_config = templates.get(template_name, {
                'subject': 'Ferrero Automation Notification',
                'html': '<p>{}</p>'.format(data)
            })

            # Render subject and body
            subject = template_config['subject'].format(**data)
            html_template = Template(template_config['html'])
            html_body = html_template.render(**data)

            # Prepare email
            msg = MIMEMultipart('alternative')
            msg['Subject'] = subject
            msg['From'] = self.sender_email
            msg['To'] = ', '.join(recipients) if isinstance(recipients, list) else recipients

            # Attach HTML body
            html_part = MIMEText(html_body, 'html')
            msg.attach(html_part)

            # Send via SMTP
            with smtplib.SMTP(self.smtp_server, self.smtp_port) as server:
                server.starttls()
                server.login(self.smtp_user, self.smtp_password)
                server.send_message(msg)

            logger.info("Email sent via SMTP: {} to {}".format(template_name, recipients))

        except Exception as e:
            logger.error("Email error: {}".format(str(e)))

    def send_webhook(self, url, payload):
        """
        Send outgoing webhook notification

        Args:
            url: Webhook URL
            payload: dict to send as JSON

        Returns:
            bool: Success status
        """
        try:
            # Get webhook config if exists
            webhook_config = None
            for name, config in self.webhook_config.items():
                if config.get('url') == url:
                    webhook_config = config
                    break

            if not webhook_config:
                webhook_config = {'timeout_seconds': 10, 'auth': {}}

            # Prepare headers
            headers = {'Content-Type': 'application/json'}

            # Add auth if configured
            auth_config = webhook_config.get('auth', {})
            if auth_config.get('type') == 'bearer' and auth_config.get('token'):
                headers['Authorization'] = 'Bearer {}'.format(auth_config['token'])
            elif auth_config.get('type') == 'basic':
                # Could add basic auth here if needed
                pass

            # Send webhook
            response = requests.post(
                url,
                json=payload,
                headers=headers,
                timeout=webhook_config.get('timeout_seconds', 10)
            )

            if response.status_code in [200, 201, 202]:
                logger.info("Webhook sent successfully: {}".format(url))
                return True
            else:
                logger.warning("Webhook failed: HTTP {} - {}".format(
                    response.status_code, response.text[:200]
                ))
                return False

        except Exception as e:
            logger.error("Webhook error: {}".format(str(e)))
            return False