"""Notifications plugin main class."""

import json
import logging
from pathlib import Path
from typing import List, Dict, Optional, Type

from flask import Flask, Blueprint
import click

from shopdb.plugins.base import BasePlugin, PluginMeta
from shopdb.extensions import db

from .models import Notification, NotificationType
from .api import notifications_bp

logger = logging.getLogger(__name__)


class NotificationsPlugin(BasePlugin):
    """
    Notifications plugin - manages announcements and notifications.

    Provides functionality for:
    - Creating and managing notifications/announcements
    - Displaying banner notifications
    - Calendar view of notifications
    """

    def __init__(self):
        self._manifest = self._load_manifest()

    def _load_manifest(self) -> Dict:
        """Load plugin manifest from JSON file."""
        manifest_path = Path(__file__).parent / 'manifest.json'
        if manifest_path.exists():
            with open(manifest_path, 'r') as f:
                return json.load(f)
        return {}

    @property
    def meta(self) -> PluginMeta:
        """Return plugin metadata."""
        return PluginMeta(
            name=self._manifest.get('name', 'notifications'),
            version=self._manifest.get('version', '1.0.0'),
            description=self._manifest.get(
                'description',
                'Notifications and announcements management'
            ),
            author=self._manifest.get('author', 'ShopDB Team'),
            dependencies=self._manifest.get('dependencies', []),
            core_version=self._manifest.get('core_version', '>=1.0.0'),
            api_prefix=self._manifest.get('api_prefix', '/api/notifications'),
        )

    def get_blueprint(self) -> Optional[Blueprint]:
        """Return Flask Blueprint with API routes."""
        return notifications_bp

    def get_models(self) -> List[Type]:
        """Return list of SQLAlchemy model classes."""
        return [Notification, NotificationType]

    def init_app(self, app: Flask, db_instance) -> None:
        """Initialize plugin with Flask app."""
        logger.info(f"Notifications plugin initialized (v{self.meta.version})")

    def on_install(self, app: Flask) -> None:
        """Called when plugin is installed."""
        with app.app_context():
            self._ensure_notification_types()
            logger.info("Notifications plugin installed")

    def _ensure_notification_types(self) -> None:
        """Ensure default notification types exist."""
        default_types = [
            ('Awareness', 'General awareness notification', '#17a2b8', 'info-circle'),
            ('Change', 'Planned change notification', '#ffc107', 'exchange-alt'),
            ('Incident', 'Incident or outage notification', '#dc3545', 'exclamation-triangle'),
            ('Maintenance', 'Scheduled maintenance notification', '#6c757d', 'wrench'),
            ('General', 'General announcement', '#28a745', 'bullhorn'),
        ]

        for typename, description, color, icon in default_types:
            existing = NotificationType.query.filter_by(typename=typename).first()
            if not existing:
                t = NotificationType(
                    typename=typename,
                    description=description,
                    color=color,
                    icon=icon
                )
                db.session.add(t)
                logger.debug(f"Created notification type: {typename}")

        db.session.commit()

    def on_uninstall(self, app: Flask) -> None:
        """Called when plugin is uninstalled."""
        logger.info("Notifications plugin uninstalled")

    def get_cli_commands(self) -> List:
        """Return CLI commands for this plugin."""

        @click.group('notifications')
        def notifications_cli():
            """Notifications plugin commands."""
            pass

        @notifications_cli.command('list-types')
        def list_types():
            """List all notification types."""
            from flask import current_app

            with current_app.app_context():
                types = NotificationType.query.filter_by(isactive=True).all()
                if not types:
                    click.echo('No notification types found.')
                    return

                click.echo('Notification Types:')
                for t in types:
                    click.echo(f"  [{t.notificationtypeid}] {t.typename} ({t.color})")

        @notifications_cli.command('stats')
        def stats():
            """Show notification statistics."""
            from flask import current_app
            from datetime import datetime

            with current_app.app_context():
                now = datetime.utcnow()

                total = Notification.query.filter(
                    Notification.isactive == True
                ).count()

                active = Notification.query.filter(
                    Notification.isactive == True,
                    Notification.startdate <= now,
                    db.or_(
                        Notification.enddate.is_(None),
                        Notification.enddate >= now
                    )
                ).count()

                click.echo(f"Total notifications: {total}")
                click.echo(f"Currently active: {active}")

        @notifications_cli.command('create')
        @click.option('--title', required=True, help='Notification title')
        @click.option('--message', required=True, help='Notification message')
        @click.option('--type', 'type_name', default='General', help='Notification type')
        def create_notification(title, message, type_name):
            """Create a new notification."""
            from flask import current_app

            with current_app.app_context():
                ntype = NotificationType.query.filter_by(typename=type_name).first()
                if not ntype:
                    click.echo(f"Error: Notification type '{type_name}' not found.")
                    return

                n = Notification(
                    title=title,
                    message=message,
                    notificationtypeid=ntype.notificationtypeid
                )
                db.session.add(n)
                db.session.commit()

                click.echo(f"Created notification #{n.notificationid}: {title}")

        return [notifications_cli]

    def get_dashboard_widgets(self) -> List[Dict]:
        """Return dashboard widget definitions."""
        return [
            {
                'name': 'Active Notifications',
                'component': 'NotificationsWidget',
                'endpoint': '/api/notifications/dashboard/summary',
                'size': 'small',
                'position': 1,
            },
        ]

    def get_navigation_items(self) -> List[Dict]:
        """Return navigation menu items."""
        return [
            {
                'name': 'Notifications',
                'icon': 'bell',
                'route': '/notifications',
                'position': 5,
            },
            {
                'name': 'Calendar',
                'icon': 'calendar',
                'route': '/calendar',
                'position': 6,
            },
        ]