"""Polymorphic Asset models - core of the new asset architecture."""

from shopdb.extensions import db
from .base import BaseModel, SoftDeleteMixin, AuditMixin


class AssetType(BaseModel):
    """
    Registry of asset categories.

    Each type maps to a plugin-owned extension table.
    Examples: equipment, computer, network_device, printer
    """
    __tablename__ = 'assettypes'

    assettypeid = db.Column(db.Integer, primary_key=True)
    assettype = db.Column(
        db.String(50),
        unique=True,
        nullable=False,
        comment='Category name: equipment, computer, network_device, printer'
    )
    plugin_name = db.Column(
        db.String(100),
        nullable=True,
        comment='Plugin that owns this type'
    )
    table_name = db.Column(
        db.String(100),
        nullable=True,
        comment='Extension table name for this type'
    )
    description = db.Column(db.Text)
    icon = db.Column(db.String(50), comment='Icon name for UI')

    def __repr__(self):
        return f"<AssetType {self.assettype}>"


class AssetStatus(BaseModel):
    """Asset status options."""
    __tablename__ = 'assetstatuses'

    statusid = db.Column(db.Integer, primary_key=True)
    status = db.Column(db.String(50), unique=True, nullable=False)
    description = db.Column(db.Text)
    color = db.Column(db.String(20), comment='CSS color for UI')

    def __repr__(self):
        return f"<AssetStatus {self.status}>"


class Asset(BaseModel, SoftDeleteMixin, AuditMixin):
    """
    Core asset model - minimal shared fields.

    Category-specific data lives in plugin extension tables
    (equipment, computers, network_devices, printers).
    The assetid matches original machineid for migration compatibility.
    """
    __tablename__ = 'assets'

    assetid = db.Column(db.Integer, primary_key=True)

    # Identification
    assetnumber = db.Column(
        db.String(50),
        unique=True,
        nullable=False,
        index=True,
        comment='Business identifier (e.g., CMM01, G5QX1GT3ESF)'
    )
    name = db.Column(
        db.String(100),
        comment='Display name/alias'
    )
    serialnumber = db.Column(
        db.String(100),
        index=True,
        comment='Hardware serial number'
    )

    # Classification
    assettypeid = db.Column(
        db.Integer,
        db.ForeignKey('assettypes.assettypeid'),
        nullable=False
    )
    statusid = db.Column(
        db.Integer,
        db.ForeignKey('assetstatuses.statusid'),
        default=1,
        comment='In Use, Spare, Retired, etc.'
    )

    # Location and organization
    locationid = db.Column(
        db.Integer,
        db.ForeignKey('locations.locationid'),
        nullable=True
    )
    businessunitid = db.Column(
        db.Integer,
        db.ForeignKey('businessunits.businessunitid'),
        nullable=True
    )

    # Floor map position
    mapleft = db.Column(db.Integer, comment='X coordinate on floor map')
    maptop = db.Column(db.Integer, comment='Y coordinate on floor map')

    # Notes
    notes = db.Column(db.Text, nullable=True)

    # Relationships
    assettype = db.relationship('AssetType', backref='assets')
    status = db.relationship('AssetStatus', backref='assets')
    location = db.relationship('Location', backref='assets')
    businessunit = db.relationship('BusinessUnit', backref='assets')

    # Communications (one-to-many) - will be migrated to use assetid
    communications = db.relationship(
        'Communication',
        foreign_keys='Communication.assetid',
        backref='asset',
        cascade='all, delete-orphan',
        lazy='dynamic'
    )

    # Indexes
    __table_args__ = (
        db.Index('idx_asset_type_bu', 'assettypeid', 'businessunitid'),
        db.Index('idx_asset_location', 'locationid'),
        db.Index('idx_asset_active', 'isactive'),
        db.Index('idx_asset_status', 'statusid'),
    )

    def __repr__(self):
        return f"<Asset {self.assetnumber}>"

    @property
    def display_name(self):
        """Get display name (name if set, otherwise assetnumber)."""
        return self.name or self.assetnumber

    @property
    def primary_ip(self):
        """Get primary IP address from communications."""
        comm = self.communications.filter_by(
            isprimary=True,
            comtypeid=1  # IP type
        ).first()
        if comm:
            return comm.ipaddress
        # Fall back to any IP
        comm = self.communications.filter_by(comtypeid=1).first()
        return comm.ipaddress if comm else None

    def get_inherited_location(self):
        """
        Get location data from a related asset if this asset has none.

        Returns dict with locationid, location_name, mapleft, maptop, and
        inherited_from (assetnumber of source asset) if location was inherited.
        Returns None if no location data available.
        """
        # If we have our own location data, don't inherit
        if self.locationid is not None or (self.mapleft is not None and self.maptop is not None):
            return None

        # Check related assets for location data
        # Look in both incoming and outgoing relationships
        related_assets = []

        if hasattr(self, 'incoming_relationships'):
            for rel in self.incoming_relationships:
                if rel.source_asset and rel.isactive:
                    related_assets.append(rel.source_asset)

        if hasattr(self, 'outgoing_relationships'):
            for rel in self.outgoing_relationships:
                if rel.target_asset and rel.isactive:
                    related_assets.append(rel.target_asset)

        # Find first related asset with location data
        for related in related_assets:
            if related.locationid is not None or (related.mapleft is not None and related.maptop is not None):
                return {
                    'locationid': related.locationid,
                    'location_name': related.location.locationname if related.location else None,
                    'mapleft': related.mapleft,
                    'maptop': related.maptop,
                    'inherited_from': related.assetnumber
                }

        return None

    def to_dict(self, include_type_data=False, include_inherited_location=True):
        """
        Convert model to dictionary.

        Args:
            include_type_data: If True, include category-specific data from extension table
            include_inherited_location: If True, include location from related assets when missing
        """
        result = super().to_dict()

        # Add related object names for convenience
        if self.assettype:
            result['assettype_name'] = self.assettype.assettype
        if self.status:
            result['status_name'] = self.status.status
        if self.location:
            result['location_name'] = self.location.locationname
        if self.businessunit:
            result['businessunit_name'] = self.businessunit.businessunit

        # Add plugin-specific ID for navigation purposes
        if hasattr(self, 'equipment') and self.equipment:
            result['plugin_id'] = self.equipment.equipmentid
        elif hasattr(self, 'computer') and self.computer:
            result['plugin_id'] = self.computer.computerid
        elif hasattr(self, 'network_device') and self.network_device:
            result['plugin_id'] = self.network_device.networkdeviceid
        elif hasattr(self, 'printer') and self.printer:
            result['plugin_id'] = self.printer.printerid

        # Include inherited location if this asset has no location data
        if include_inherited_location:
            inherited = self.get_inherited_location()
            if inherited:
                result['inherited_location'] = inherited
                # Also set the location fields if they're missing
                if result.get('locationid') is None:
                    result['locationid'] = inherited['locationid']
                    result['location_name'] = inherited['location_name']
                if result.get('mapleft') is None:
                    result['mapleft'] = inherited['mapleft']
                if result.get('maptop') is None:
                    result['maptop'] = inherited['maptop']

        # Include extension data if requested
        if include_type_data:
            ext_data = self._get_extension_data()
            if ext_data:
                result['type_data'] = ext_data

        return result

    def _get_extension_data(self):
        """Get category-specific data from extension table."""
        # Check for equipment extension
        if hasattr(self, 'equipment') and self.equipment:
            return self.equipment.to_dict()
        # Check for computer extension
        if hasattr(self, 'computer') and self.computer:
            return self.computer.to_dict()
        # Check for network_device extension
        if hasattr(self, 'network_device') and self.network_device:
            return self.network_device.to_dict()
        # Check for printer extension
        if hasattr(self, 'printer') and self.printer:
            return self.printer.to_dict()
        return None