import uuid
import enum
from datetime import datetime
from sqlalchemy import String, DateTime, Boolean, Text, ForeignKey, BigInteger, Enum as SAEnum, Index
from sqlalchemy.orm import Mapped, mapped_column, relationship
from sqlalchemy.dialects.postgresql import UUID, JSONB
from app.database import Base


class ProcessingStatus(str, enum.Enum):
    pending = "pending"
    processing = "processing"
    completed = "completed"
    failed = "failed"


class CadFile(Base):
    __tablename__ = "cad_files"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    original_name: Mapped[str] = mapped_column(String(500), nullable=False)
    stored_path: Mapped[str] = mapped_column(String(1000), nullable=False)
    file_hash: Mapped[str] = mapped_column(String(64), unique=True, nullable=False, index=True)
    file_size: Mapped[int] = mapped_column(BigInteger, nullable=True)
    parsed_objects: Mapped[dict] = mapped_column(JSONB, nullable=True)
    thumbnail_path: Mapped[str] = mapped_column(String(1000), nullable=True)
    gltf_path: Mapped[str] = mapped_column(String(1000), nullable=True)
    processing_status: Mapped[ProcessingStatus] = mapped_column(
        SAEnum(ProcessingStatus), default=ProcessingStatus.pending, nullable=False
    )
    error_message: Mapped[str] = mapped_column(String(2000), nullable=True)
    render_log: Mapped[dict] = mapped_column(JSONB, nullable=True)
    mesh_attributes: Mapped[dict | None] = mapped_column(JSONB, nullable=True)
    step_file_hash: Mapped[str | None] = mapped_column(String(64), nullable=True, index=True)
    tenant_id: Mapped[uuid.UUID | None] = mapped_column(
        UUID(as_uuid=True), ForeignKey("tenants.id"), nullable=True, index=True
    )
    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow, nullable=False)
    updated_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow, nullable=False)

    order_items: Mapped[list["OrderItem"]] = relationship("OrderItem", back_populates="cad_file")
    products: Mapped[list["Product"]] = relationship("Product", back_populates="cad_file")


class Product(Base):
    __tablename__ = "products"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    pim_id: Mapped[str] = mapped_column(String(500), nullable=False)
    name: Mapped[str | None] = mapped_column(String(500), nullable=True)
    category_key: Mapped[str | None] = mapped_column(String(100), nullable=True, index=True)
    ebene1: Mapped[str | None] = mapped_column(String(500), nullable=True)
    ebene2: Mapped[str | None] = mapped_column(String(500), nullable=True)
    baureihe: Mapped[str | None] = mapped_column(String(500), nullable=True)
    produkt_baureihe: Mapped[str | None] = mapped_column(String(500), nullable=True)
    lagertyp: Mapped[str | None] = mapped_column(String(500), nullable=True)
    name_cad_modell: Mapped[str | None] = mapped_column(String(500), nullable=True, index=True)
    gewuenschte_bildnummer: Mapped[str | None] = mapped_column(String(500), nullable=True)
    medias_rendering: Mapped[bool | None] = mapped_column(Boolean, nullable=True)
    components: Mapped[list] = mapped_column(JSONB, nullable=False, default=list)
    cad_part_materials: Mapped[list] = mapped_column(JSONB, nullable=False, default=list)
    cad_file_id: Mapped[uuid.UUID | None] = mapped_column(
        UUID(as_uuid=True), ForeignKey("cad_files.id", ondelete="SET NULL"), nullable=True
    )
    notes: Mapped[str | None] = mapped_column(Text, nullable=True)
    is_active: Mapped[bool] = mapped_column(Boolean, nullable=False, default=True)
    arbeitspaket: Mapped[str | None] = mapped_column(String(500), nullable=True)
    source_excel: Mapped[str | None] = mapped_column(String(1000), nullable=True)
    tenant_id: Mapped[uuid.UUID | None] = mapped_column(
        UUID(as_uuid=True), ForeignKey("tenants.id"), nullable=True, index=True
    )
    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow, nullable=False)
    updated_at: Mapped[datetime] = mapped_column(
        DateTime, default=datetime.utcnow, onupdate=datetime.utcnow, nullable=False
    )

    cad_file: Mapped["CadFile | None"] = relationship("CadFile", back_populates="products")
    tenant: Mapped["Tenant | None"] = relationship("Tenant", back_populates="products", lazy="noload")
    order_lines: Mapped[list["OrderLine"]] = relationship(
        "OrderLine", back_populates="product", cascade="all, delete-orphan"
    )
    render_positions: Mapped[list["ProductRenderPosition"]] = relationship(
        "ProductRenderPosition", back_populates="product",
        cascade="all, delete-orphan", order_by="ProductRenderPosition.sort_order"
    )

    @property
    def thumbnail_url(self) -> str | None:
        if self.cad_file and self.cad_file.thumbnail_path:
            from pathlib import Path
            return f"/thumbnails/{Path(self.cad_file.thumbnail_path).name}"
        return None

    @property
    def processing_status(self) -> str | None:
        if self.cad_file:
            return self.cad_file.processing_status.value if hasattr(
                self.cad_file.processing_status, 'value'
            ) else str(self.cad_file.processing_status)
        return None

    @property
    def cad_parsed_objects(self) -> list[str] | None:
        if self.cad_file and self.cad_file.parsed_objects:
            return self.cad_file.parsed_objects.get("objects") or []
        return None
