"""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.api import db, AssetType

from .models import Computer, ComputerType, ComputerInstalledApp, AccessProtocol, ComputerAccess
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, AccessProtocol, ComputerAccess]

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

    # -- ADR-006 collector contract -----------------------------------------

    def get_collector_schema(self) -> Optional[Dict]:
        """Schema for the PC collector payload (matched by hostname).

        Aligns with the GE-Enforce status shape (transport may change), using
        the project naming convention (lowercase concatenated). The caller maps
        its own field names to these.
        """
        return {
            'identityfield': 'hostname',
            'fields': {
                'hostname': {'type': 'string', 'required': True},
                'machinenumber': {'type': 'string'},
                'pctype': {'type': 'string'},
                'pcsubtype': {'type': 'string'},
                'serialnumber': {'type': 'string'},
                'loggedinuser': {'type': 'string'},
                'lastboottime': {'type': 'string', 'format': 'date-time'},
                'lastcheckin': {'type': 'string', 'format': 'date-time'},
                'ipaddress': {'type': 'string'},
                'vendorname': {'type': 'string'},
                'modelnumber': {'type': 'string'},
                'osname': {'type': 'string'},
                'installedsoftware': {
                    'type': 'array',
                    'items': {'name': 'string', 'version': 'string'},
                },
            },
        }

    def apply_collector_payload(self, payload: Dict) -> Dict:
        """Idempotent upsert of a PC from a collector payload (by hostname)."""
        from datetime import datetime
        from shopdb.api import (
            Asset, Application, Communication, CommunicationType,
            Vendor, Model, OperatingSystem,
        )
        from .pctypemap import pctype_mapping

        warnings = []
        hostname = (payload.get('hostname') or '').strip()
        if not hostname:
            raise ValueError('hostname is required')

        # Machine number is the business identifier (Asset.assetnumber). Skip
        # the imaging-time placeholder '9999' and fall back to hostname.
        machinenumber = (payload.get('machinenumber') or '').strip()
        if machinenumber in ('', '9999'):
            machinenumber = None

        comp = Computer.query.filter(Computer.hostname.ilike(hostname)).first()
        if not comp:
            comp = (Computer.query.join(Asset, Asset.assetid == Computer.assetid)
                    .filter(Asset.assetnumber.ilike(hostname)).first())

        action = 'updated'
        if not comp:
            atype = AssetType.query.filter_by(assettype='computer').first()
            # statusid=1 is the first seeded asset status ("In Use"); a
            # collector-discovered PC is by definition in use.
            asset = Asset(assetnumber=machinenumber or hostname,
                          assettypeid=atype.assettypeid, statusid=1)
            db.session.add(asset)
            db.session.flush()
            comp = Computer(assetid=asset.assetid, hostname=hostname)
            db.session.add(comp)
            db.session.flush()
            action = 'created'
        elif machinenumber and comp.asset:
            comp.asset.assetnumber = machinenumber

        comp.lastreporteddate = datetime.utcnow()
        if payload.get('lastboottime'):
            try:
                comp.lastboottime = datetime.fromisoformat(
                    payload['lastboottime'].replace('Z', '+00:00'))
            except (ValueError, AttributeError):
                warnings.append('lastboottime not parseable')
        loggedinuser = payload.get('loggedinuser') or payload.get('currentuser')
        if loggedinuser:
            comp.loggedinuser = loggedinuser
        if payload.get('serialnumber') and comp.asset:
            comp.asset.serialnumber = payload['serialnumber']

        # pc-type -> ComputerType via the configurable settings mapping.
        pctype = (payload.get('pctype') or '').strip()
        if pctype:
            from .models import ComputerType
            mapped = pctype_mapping().get(pctype)
            if not mapped:
                warnings.append(f'no ComputerType mapping for pctype: {pctype}')
            else:
                ctype = ComputerType.query.filter_by(computertype=mapped).first()
                if ctype:
                    comp.computertypeid = ctype.computertypeid
                else:
                    warnings.append(f'mapped ComputerType not found: {mapped}')

        # Vendor / model are free vocab - create if missing.
        vendorname = (payload.get('vendorname') or '').strip()
        vendor = None
        if vendorname:
            vendor = Vendor.query.filter(Vendor.vendor.ilike(vendorname)).first()
            if not vendor:
                vendor = Vendor(vendor=vendorname)
                db.session.add(vendor)
                db.session.flush()
            comp.vendorid = vendor.vendorid

        modelnumber = (payload.get('modelnumber') or '').strip()
        if modelnumber:
            model_query = Model.query.filter(Model.modelnumber.ilike(modelnumber))
            if vendor:
                model_query = model_query.filter(Model.vendorid == vendor.vendorid)
            model = model_query.first()
            if not model:
                model = Model(modelnumber=modelnumber,
                              vendorid=vendor.vendorid if vendor else None)
                db.session.add(model)
                db.session.flush()
            comp.modelnumberid = model.modelnumberid

        # OS is a controlled vocab - look up only, warn if unknown.
        osname = (payload.get('osname') or '').strip()
        if osname:
            os_row = OperatingSystem.query.filter(
                OperatingSystem.osname.ilike(osname)).first()
            if os_row:
                comp.osid = os_row.osid
            else:
                warnings.append(f'unknown operating system: {osname}')

        if payload.get('pcsubtype'):
            warnings.append('pcsubtype received but not stored (no model field)')

        if payload.get('ipaddress'):
            ip_comtype = CommunicationType.query.filter_by(comtype='IP').first()
            primary = Communication.query.filter_by(
                assetid=comp.assetid, isprimary=True).first()
            if primary:
                primary.ipaddress = payload['ipaddress']
            elif ip_comtype:
                db.session.add(Communication(
                    assetid=comp.assetid, comtypeid=ip_comtype.comtypeid,
                    ipaddress=payload['ipaddress'], isprimary=True))

        for app_data in payload.get('installedsoftware', []) or []:
            name = app_data.get('name')
            if not name:
                continue
            app = Application.query.filter(Application.appname.ilike(name)).first()
            if not app:
                warnings.append(f'unknown application: {name}')
                continue
            installed = ComputerInstalledApp.query.filter_by(
                computerid=comp.computerid, appid=app.appid).first()
            version = app_data.get('version')
            if installed:
                installed.installedversion = version
                installed.isactive = True
            else:
                db.session.add(ComputerInstalledApp(
                    computerid=comp.computerid, appid=app.appid,
                    installedversion=version))

        db.session.commit()
        return {
            'action': action,
            'assetid': comp.assetid,
            'identityvalue': hostname,
            'warnings': warnings,
        }

    def on_install(self, app: Flask) -> None:
        """Called when plugin is installed."""
        with app.app_context():
            self._ensure_asset_type()
            self._ensure_computer_types()
            from .pctypemap import seed_pctype_settings
            seed_pctype_settings()
            db.session.commit()
            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.api 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 (by the Shopfloor computer type)
                sf = ComputerType.query.filter_by(computertype='Shopfloor').first()
                shopfloor = db.session.query(Computer).join(Asset).filter(
                    Asset.isactive == True,
                    Computer.computertypeid == (sf.computertypeid if sf else -1)
                ).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,
            },
        ]
