"""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: machine, 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: machine, computer, network_device, printer'
    )
    pluginname = db.Column(
        db.String(100),
        nullable=True,
        comment='Plugin that owns this type'
    )
    tablename = 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')
    color = db.Column(db.String(20), comment='CSS color for UI/map markers')

    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
    (machines, 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'
    )
    gaugelabreference = db.Column(
        db.String(50),
        index=True,
        comment='Gauge lab asset reference (authoritative tag the gauge lab '
                'assigns to machines); distinct from assetnumber'
    )
    maintenancereference = db.Column(
        db.String(50),
        index=True,
        comment='Maintenance system asset reference; distinct from assetnumber'
    )
    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 (ADR-001: asset-specific override; nullable).
    #
    # Absolute pixels in the NATIVE COORDINATE SPACE OF ITS LEVEL, not of the
    # site (ADR-017). levelid says which drawing they are pixels of, and without
    # it a position cannot be rendered - a marker drawn on the wrong level's
    # blueprint looks perfectly correct and points at the wrong place, so the UI
    # shows "level unknown" rather than assuming the default.
    mapx = db.Column(db.Integer, comment='X coordinate on this level (ADR-017)')
    mapy = db.Column(db.Integer, comment='Y coordinate on this level (ADR-017)')
    levelid = db.Column(
        db.Integer, db.ForeignKey('maplevels.levelid'), nullable=True,
        index=True,
        comment='Which drawing mapx/mapy are pixels of (ADR-017)')
    # When the position was last CONFIRMED against the current drawing. A bulk
    # transform clears it, because a transform is a starting guess: the levels
    # were redrawn and machines moved, and nothing in the coordinates says which
    # markers are now stale. Null means "not yet reviewed on this drawing".
    mapverifiedat = db.Column(db.DateTime, nullable=True)

    # 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, mapx, mapy, and
        inherited_from (assetnumber of source asset) if location was inherited.
        Returns None if no location data available.
        """
        if self.locationid is not None or (self.mapx is not None and self.mapy is not None):
            return None

        related_assets = []

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

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

        for related in related_assets:
            if related.locationid is not None or (related.mapx is not None and related.mapy is not None):
                return {
                    'locationid': related.locationid,
                    'locationname': related.location.locationname if related.location else None,
                    'mapx': related.mapx,
                    'mapy': related.mapy,
                    # The level belongs to whichever asset supplied the
                    # coordinates (ADR-017). Inheriting a position without its
                    # level draws it on the borrower's drawing instead.
                    'levelid': related.levelid,
                    'inheritedfrom': 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['assettypename'] = self.assettype.assettype
            result['assettypecolor'] = getattr(self.assettype, 'color', None)
        if self.status:
            result['statusname'] = self.status.status
            result['statuscolor'] = self.status.color
        if self.location:
            result['locationname'] = self.location.locationname
        if self.businessunit:
            result['businessunitname'] = self.businessunit.businessunit

        # Add plugin-specific ID for navigation purposes
        if hasattr(self, 'machine') and self.machine:
            result['pluginid'] = self.machine.machineid
        elif hasattr(self, 'computer') and self.computer:
            result['pluginid'] = self.computer.computerid
        elif hasattr(self, 'network_device') and self.network_device:
            result['pluginid'] = self.network_device.networkdeviceid
        elif hasattr(self, 'printer') and self.printer:
            result['pluginid'] = self.printer.printerid
        elif hasattr(self, 'measuringtool') and self.measuringtool:
            result['pluginid'] = self.measuringtool.measuringtoolid

        # Include inherited location if this asset has no location data
        if include_inherited_location:
            inherited = self.get_inherited_location()
            if inherited:
                result['inheritedlocation'] = inherited
                # Also set the location fields if they're missing
                if result.get('locationid') is None:
                    result['locationid'] = inherited['locationid']
                    result['locationname'] = inherited['locationname']
                if result.get('mapx') is None:
                    result['mapx'] = inherited['mapx']
                if result.get('mapy') is None:
                    result['mapy'] = inherited['mapy']
                # Coordinates and their level move together, always. Copying the
                # position while leaving levelid as this asset's own is how an
                # inherited marker lands on the wrong drawing.
                if result.get('levelid') is None:
                    result['levelid'] = inherited.get('levelid')

        # Operation/short code of the resolved location (own or inherited).
        # Derived from the location name's leading token; labels can encode a
        # tool's inspection operation instead of the tool. None when unplaced.
        from .location import derive_locationcode
        result['locationcode'] = derive_locationcode(result.get('locationname'))

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

        return result

    def _get_extension_data(self):
        """Get category-specific data from extension table."""
        # Check for machine extension
        if hasattr(self, 'machine') and self.machine:
            return self.machine.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()
        # Check for measuring-tool extension
        if hasattr(self, 'measuringtool') and self.measuringtool:
            return self.measuringtool.to_dict()
        return None
