"""Machines 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, AssetStatus

from .models import Machine, MachineType
from .api import machines_bp

logger = logging.getLogger(__name__)


class MachinesPlugin(BasePlugin):
    """
    Machines plugin - manages manufacturing machine assets.

    Machines include CNCs, CMMs, lathes, grinders, EDMs, part markers, etc.
    Uses the new Asset architecture with Machine 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', 'machines'),
            version=self._manifest.get('version', '1.0.0'),
            description=self._manifest.get(
                'description',
                'Machine management for manufacturing assets'
            ),
            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/machines'),
        )

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

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

    def init_app(self, app: Flask, db_instance) -> None:
        """Initialize plugin with Flask app."""
        logger.info(f"Machines 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_asset_statuses()
            self._ensure_machine_types()
            logger.info("Machines plugin installed")

    def _ensure_asset_type(self) -> None:
        """Ensure machine asset type exists."""
        existing = AssetType.query.filter_by(assettype='machine').first()
        if not existing:
            at = AssetType(
                assettype='machine',
                pluginname='machines',
                tablename='machines',
                description='Manufacturing machines (CNCs, CMMs, lathes, etc.)',
                icon='cog'
            )
            db.session.add(at)
            logger.debug("Created asset type: machine")
        db.session.commit()

    def _ensure_asset_statuses(self) -> None:
        """Ensure standard asset statuses exist."""
        statuses = [
            ('In Use', 'Asset is currently in use', '#28a745'),
            ('Spare', 'Spare/backup asset', '#17a2b8'),
            ('Retired', 'Asset has been retired', '#6c757d'),
            ('Maintenance', 'Asset is under maintenance', '#ffc107'),
            ('Decommissioned', 'Asset has been decommissioned', '#dc3545'),
        ]

        for name, description, color in statuses:
            existing = AssetStatus.query.filter_by(status=name).first()
            if not existing:
                s = AssetStatus(
                    status=name,
                    description=description,
                    color=color
                )
                db.session.add(s)
                logger.debug(f"Created asset status: {name}")

        db.session.commit()

    def _ensure_machine_types(self) -> None:
        """Ensure basic machine types exist."""
        machine_types = [
            ('CNC', 'Computer Numerical Control machine', 'cnc'),
            ('CMM', 'Coordinate Measuring Machine', 'cmm'),
            ('Lathe', 'Lathe machine', 'lathe'),
            ('Grinder', 'Grinding machine', 'grinder'),
            ('EDM', 'Electrical Discharge Machine', 'edm'),
            ('Part Marker', 'Part marking/engraving machine', 'marker'),
            ('Mill', 'Milling machine', 'mill'),
            ('Press', 'Press machine', 'press'),
            ('Robot', 'Industrial robot', 'robot'),
            ('Other', 'Other machine type', 'cog'),
        ]

        for name, description, icon in machine_types:
            existing = MachineType.query.filter_by(machinetype=name).first()
            if not existing:
                mt = MachineType(
                    machinetype=name,
                    description=description,
                    icon=icon
                )
                db.session.add(mt)
                logger.debug(f"Created machine type: {name}")

        db.session.commit()

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

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

        @click.group('machines')
        def machinescli():
            """Machines plugin commands."""
            pass

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

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

                click.echo('Machine Types:')
                for t in types:
                    click.echo(f"  [{t.machinetypeid}] {t.machinetype}")

        @machinescli.command('stats')
        def stats():
            """Show machine statistics."""
            from flask import current_app
            from shopdb.api import Asset

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

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

                # By type
                by_type = db.session.query(
                    MachineType.machinetype,
                    db.func.count(Machine.machineid)
                ).join(Machine, Machine.machinetypeid == MachineType.machinetypeid
                ).join(Asset, Asset.assetid == Machine.assetid
                ).filter(Asset.isactive == True
                ).group_by(MachineType.machinetype
                ).all()

                if by_type:
                    click.echo("\nBy Type:")
                    for t, c in by_type:
                        click.echo(f"  {t}: {c}")

        return [machinescli]

    def get_dashboard_widgets(self) -> List[Dict]:
        """Dashboard card: machines not in service.

        A machine sitting in Repair or marked Lost is a thing someone is
        supposed to be chasing, and nothing surfaces it today - it is visible
        only to whoever thinks to filter the machines list by status.

        Replaces a declaration naming a component nobody wrote.
        """
        return [
            {
                'id': 'machines-outofservice',
                'viewall': '/machines',
                'title': 'Machines out of service',
                'endpoint': '/api/machines/dashboard/outofservice',
                'render': 'exceptions',
                'severity': 'warning',
                'permission': 'machines.view',
                'empty': 'hide',
                'position': 45,
                'map': {
                    'title': 'assetnumber',
                    'detail': 'status',
                    'meta': [{'key': 'name'}],
                    'link': '/machines/{assetid}',
                },
            },
        ]

    def get_navigation_items(self) -> List[Dict]:
        """Return navigation menu items."""
        return [
            {
                'name': 'Machines',
                'icon': 'cog',
                'route': '/machines',
                'position': 10,
            },
        ]

    def get_permissions(self) -> List:
        """Return the RBAC permissions this plugin owns."""
        return [
            ('machines.view', 'View machines', 'machines'),
            ('machines.create', 'Create machines', 'machines'),
            ('machines.edit', 'Edit machines', 'machines'),
            ('machines.delete', 'Delete machines', 'machines'),
        ]
