import uuid
from datetime import datetime
from sqlalchemy import String, DateTime, Boolean, Text, Integer, Float, ForeignKey, Table, Column
from sqlalchemy.orm import Mapped, mapped_column, relationship
from sqlalchemy.dialects.postgresql import UUID, JSONB
from app.database import Base


# M2M: render templates ↔ output types
render_template_output_types = Table(
    "render_template_output_types",
    Base.metadata,
    Column("template_id", UUID(as_uuid=True), ForeignKey("render_templates.id", ondelete="CASCADE"), primary_key=True),
    Column("output_type_id", UUID(as_uuid=True), ForeignKey("output_types.id", ondelete="CASCADE"), primary_key=True),
)

VALID_RENDER_BACKENDS = {"celery"}


class OutputType(Base):
    __tablename__ = "output_types"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    name: Mapped[str] = mapped_column(String(200), unique=True, nullable=False)
    description: Mapped[str | None] = mapped_column(Text, nullable=True)
    renderer: Mapped[str] = mapped_column(String(50), nullable=False, default="threejs")
    render_settings: Mapped[dict] = mapped_column(JSONB, nullable=False, default=dict)
    output_format: Mapped[str] = mapped_column(String(20), nullable=False, default="png")
    sort_order: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    compatible_categories: Mapped[list] = mapped_column(JSONB, default=list, server_default="[]")
    render_backend: Mapped[str] = mapped_column(String(20), nullable=False, default="auto", server_default="auto")
    is_animation: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False, server_default="false")
    transparent_bg: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False, server_default="false")
    cycles_device: Mapped[str | None] = mapped_column(String(10), nullable=True, default=None)
    pricing_tier_id: Mapped[int | None] = mapped_column(
        Integer, ForeignKey("pricing_tiers.id", ondelete="SET NULL"), nullable=True, index=True
    )
    is_active: Mapped[bool] = mapped_column(Boolean, nullable=False, default=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
    )

    material_override: Mapped[str | None] = mapped_column(String(200), nullable=True, default=None)

    workflow_definition_id: Mapped[uuid.UUID | None] = mapped_column(
        UUID(as_uuid=True), ForeignKey("workflow_definitions.id", ondelete="SET NULL"), nullable=True
    )

    order_lines: Mapped[list["OrderLine"]] = relationship("OrderLine", back_populates="output_type")
    pricing_tier: Mapped["PricingTier | None"] = relationship("PricingTier", back_populates="output_types")


class RenderTemplate(Base):
    __tablename__ = "render_templates"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    name: Mapped[str] = mapped_column(String(300), nullable=False)
    category_key: Mapped[str | None] = mapped_column(String(100), nullable=True)
    output_type_id: Mapped[uuid.UUID | None] = mapped_column(
        UUID(as_uuid=True), ForeignKey("output_types.id", ondelete="SET NULL"), nullable=True
    )
    blend_file_path: Mapped[str] = mapped_column(Text, nullable=False)
    original_filename: Mapped[str] = mapped_column(String(500), nullable=False)
    target_collection: Mapped[str] = mapped_column(String(200), nullable=False, default="Product", server_default="Product")
    material_replace_enabled: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False, server_default="false")
    lighting_only: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False, server_default="false")
    shadow_catcher_enabled: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False, server_default="false")
    camera_orbit: Mapped[bool] = mapped_column(Boolean, nullable=False, default=True, server_default="true")
    is_active: Mapped[bool] = mapped_column(Boolean, nullable=False, default=True, server_default="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, nullable=False, server_default="now()")
    updated_at: Mapped[datetime] = mapped_column(DateTime, nullable=False, server_default="now()", onupdate=datetime.utcnow)

    # Legacy single FK (kept for backward compat, prefer output_types M2M)
    output_type = relationship("OutputType", lazy="joined")
    # M2M: multiple output types per template
    output_types = relationship("OutputType", secondary=render_template_output_types, lazy="joined")


class ProductRenderPosition(Base):
    __tablename__ = "product_render_positions"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    product_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True), ForeignKey("products.id", ondelete="CASCADE"), nullable=False, index=True
    )
    name: Mapped[str] = mapped_column(String(200), nullable=False)
    rotation_x: Mapped[float] = mapped_column(Float, nullable=False, default=0.0)
    rotation_y: Mapped[float] = mapped_column(Float, nullable=False, default=0.0)
    rotation_z: Mapped[float] = mapped_column(Float, nullable=False, default=0.0)
    is_default: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
    sort_order: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    focal_length_mm: Mapped[float | None] = mapped_column(Float, nullable=True, default=None)
    sensor_width_mm: Mapped[float | None] = mapped_column(Float, nullable=True, default=None)
    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
    )

    product: Mapped["Product"] = relationship("Product", back_populates="render_positions")
    order_lines: Mapped[list["OrderLine"]] = relationship("OrderLine", back_populates="render_position")


class GlobalRenderPosition(Base):
    __tablename__ = "global_render_positions"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    name: Mapped[str] = mapped_column(String(200), nullable=False)
    rotation_x: Mapped[float] = mapped_column(Float, nullable=False, default=0.0)
    rotation_y: Mapped[float] = mapped_column(Float, nullable=False, default=0.0)
    rotation_z: Mapped[float] = mapped_column(Float, nullable=False, default=0.0)
    is_default: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
    sort_order: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    focal_length_mm: Mapped[float | None] = mapped_column(Float, nullable=True, default=None)
    sensor_width_mm: Mapped[float | None] = mapped_column(Float, nullable=True, default=None)
    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_lines: Mapped[list["OrderLine"]] = relationship("OrderLine", back_populates="global_render_position")


class WorkflowDefinition(Base):
    __tablename__ = "workflow_definitions"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    name: Mapped[str] = mapped_column(String(200), nullable=False)
    output_type_id: Mapped[uuid.UUID | None] = mapped_column(
        UUID(as_uuid=True), ForeignKey("output_types.id", ondelete="SET NULL"), nullable=True
    )
    config: Mapped[dict] = mapped_column(JSONB, nullable=False, default=dict)
    is_active: Mapped[bool] = mapped_column(Boolean, nullable=False, default=True)
    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow, nullable=False)

    runs: Mapped[list["WorkflowRun"]] = relationship(
        "WorkflowRun", back_populates="workflow_def", lazy="noload", cascade="all, delete-orphan"
    )


class WorkflowRun(Base):
    __tablename__ = "workflow_runs"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    workflow_def_id: Mapped[uuid.UUID | None] = mapped_column(
        UUID(as_uuid=True), ForeignKey("workflow_definitions.id", ondelete="SET NULL"), nullable=True
    )
    order_line_id: Mapped[uuid.UUID | None] = mapped_column(
        UUID(as_uuid=True), ForeignKey("order_lines.id", ondelete="CASCADE"), nullable=True, index=True
    )
    celery_task_id: Mapped[str | None] = mapped_column(String(500), nullable=True)
    status: Mapped[str] = mapped_column(String(50), nullable=False, default="pending")
    started_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)
    completed_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)
    error_message: Mapped[str | None] = mapped_column(Text, nullable=True)
    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow, nullable=False)

    workflow_def: Mapped["WorkflowDefinition | None"] = relationship(
        "WorkflowDefinition", back_populates="runs"
    )
    node_results: Mapped[list["WorkflowNodeResult"]] = relationship(
        "WorkflowNodeResult", back_populates="run", cascade="all, delete-orphan"
    )


class WorkflowNodeResult(Base):
    __tablename__ = "workflow_node_results"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    run_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True), ForeignKey("workflow_runs.id", ondelete="CASCADE"), nullable=False, index=True
    )
    node_name: Mapped[str] = mapped_column(String(200), nullable=False)
    status: Mapped[str] = mapped_column(String(50), nullable=False, default="pending")
    output: Mapped[dict | None] = mapped_column(JSONB, nullable=True)
    log: Mapped[str | None] = mapped_column(Text, nullable=True)
    duration_s: Mapped[float | None] = mapped_column(Float, nullable=True)
    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow, nullable=False)

    run: Mapped["WorkflowRun"] = relationship("WorkflowRun", back_populates="node_results")