"""Computers 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 shopdb.core.models import AssetType, AssetStatus

from .models import Computer, ComputerType, ComputerInstalledApp
from .api import computers_bp

logger = logging.getLogger(__name__)


class ComputersPlugin(BasePlugin):
    """
    Computers plugin - manages PC, server, and workstation assets.

    Computers include shopfloor PCs, engineer workstations, servers, etc.
    Uses the new Asset architecture with Computer extension table.
    """

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

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

    @property
    def meta(self) -> PluginMeta:
        """Return plugin metadata."""
        return PluginMeta(
            name=self._manifest.get('name', 'computers'),
            version=self._manifest.get('version', '1.0.0'),
            description=self._manifest.get(
                'description',
                'Computer management for PCs, servers, and workstations'
            ),
            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/computers'),
        )

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

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

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

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

    def _ensure_asset_type(self) -> None:
        """Ensure computer asset type exists."""
        existing = AssetType.query.filter_by(assettype='computer').first()
        if not existing:
            at = AssetType(
                assettype='computer',
                pluginname='computers',
                tablename='computers',
                description='PCs, servers, and workstations',
                icon='desktop'
            )
            db.session.add(at)
            logger.debug("Created asset type: computer")
        db.session.commit()

    def _ensure_computer_types(self) -> None:
        """Ensure basic computer types exist."""
        computer_types = [
            ('Shopfloor PC', 'PC located on the shop floor for machine operation', 'desktop'),
            ('Engineer Workstation', 'Engineering workstation for CAD/CAM work', 'laptop'),
            ('CMM PC', 'PC dedicated to CMM operation', 'desktop'),
            ('Server', 'Server system', 'server'),
            ('Kiosk', 'Kiosk or info display PC', 'tv'),
            ('Laptop', 'Laptop computer', 'laptop'),
            ('Virtual Machine', 'Virtual machine', 'cloud'),
            ('Other', 'Other computer type', 'desktop'),
        ]

        for name, description, icon in computer_types:
            existing = ComputerType.query.filter_by(computertype=name).first()
            if not existing:
                ct = ComputerType(
                    computertype=name,
                    description=description,
                    icon=icon
                )
                db.session.add(ct)
                logger.debug(f"Created computer type: {name}")

        db.session.commit()

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

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

        @click.group('computers')
        def computerscli():
            """Computers plugin commands."""
            pass

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

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

                click.echo('Computer Types:')
                for t in types:
                    click.echo(f"  [{t.computertypeid}] {t.computertype}")

        @computerscli.command('stats')
        def stats():
            """Show computer statistics."""
            from flask import current_app
            from shopdb.core.models import Asset

            with current_app.app_context():
                total = db.session.query(Computer).join(Asset).filter(
                    Asset.isactive == True
                ).count()

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

                # Shopfloor count
                shopfloor = db.session.query(Computer).join(Asset).filter(
                    Asset.isactive == True,
                    Computer.isshopfloor == True
                ).count()

                click.echo(f"  Shopfloor PCs: {shopfloor}")
                click.echo(f"  Other: {total - shopfloor}")

        @computerscli.command('find')
        @click.argument('hostname')
        def find_by_hostname(hostname):
            """Find a computer by hostname."""
            from flask import current_app

            with current_app.app_context():
                comp = Computer.query.filter(
                    Computer.hostname.ilike(f'%{hostname}%')
                ).first()

                if not comp:
                    click.echo(f'No computer found matching hostname: {hostname}')
                    return

                click.echo(f'Found: {comp.hostname}')
                click.echo(f'  Asset: {comp.asset.assetnumber}')
                click.echo(f'  Type: {comp.computertype.computertype if comp.computertype else "N/A"}')
                click.echo(f'  OS: {comp.operatingsystem.osname if comp.operatingsystem else "N/A"}')
                click.echo(f'  Logged in: {comp.loggedinuser or "N/A"}')

        return [computerscli]

    def get_dashboard_widgets(self) -> List[Dict]:
        """Return dashboard widget definitions."""
        return [
            {
                'name': 'Computer Status',
                'component': 'ComputerStatusWidget',
                'endpoint': '/api/computers/dashboard/summary',
                'size': 'medium',
                'position': 6,
            },
        ]

    def get_navigation_items(self) -> List[Dict]:
        """Return navigation menu items."""
        return [
            {
                'name': 'PCs',
                'icon': 'desktop',
                'route': '/pcs',
                'position': 15,
            },
        ]