"""Durable product-resource schema: projects, simulations, and reports.

These replace the legacy filesystem-backed ProjectManager / SimulationManager /
ReportManager payloads with tenant- and owner-scoped SQL rows, so product state
survives restarts and multiple workers without cross-tenant leakage.
"""

from __future__ import annotations

from datetime import datetime, timezone
from enum import Enum
from uuid import uuid4

from sqlalchemy import (
    DateTime,
    ForeignKey,
    Index,
    Integer,
    JSON,
    String,
    Text,
    UniqueConstraint,
    func,
    text,
)
from sqlalchemy.orm import Mapped, mapped_column

from ..db import Base


def _id(prefix: str) -> str:
    return f"{prefix}_{uuid4().hex}"


def _utc_now() -> datetime:
    return datetime.now(timezone.utc)


class ProjectStatus(str, Enum):
    CREATED = "created"
    ONTOLOGY_GENERATED = "ontology_generated"
    GRAPH_BUILDING = "graph_building"
    GRAPH_COMPLETED = "graph_completed"
    FAILED = "failed"


class SimulationStatus(str, Enum):
    CREATED = "created"
    PREPARING = "preparing"
    READY = "ready"
    RUNNING = "running"
    COMPLETED = "completed"
    FAILED = "failed"
    CANCELLED = "cancelled"


class ReportStatus(str, Enum):
    DRAFT = "draft"
    PLANNING = "planning"
    GENERATING = "generating"
    COMPLETED = "completed"
    FAILED = "failed"


class ProductProject(Base):
    """Durable, tenant-owned project record (metadata + ontology)."""

    __tablename__ = "projects"
    __table_args__ = (
        Index("ix_projects_org_owner", "organization_id", "owner_user_id"),
        Index("ix_projects_org_created", "organization_id", "created_at"),
    )

    id: Mapped[str] = mapped_column(
        String(128), primary_key=True, default=lambda: _id("project")
    )
    organization_id: Mapped[str] = mapped_column(
        ForeignKey("organizations.id", ondelete="CASCADE"), nullable=False, index=True
    )
    owner_user_id: Mapped[str | None] = mapped_column(
        ForeignKey("users.id", ondelete="SET NULL"), nullable=True, index=True
    )
    name: Mapped[str] = mapped_column(String(255), nullable=False, server_default=text("''"))
    status: Mapped[str] = mapped_column(
        String(32), nullable=False, default=ProjectStatus.CREATED.value, server_default=text("'created'")
    )
    language: Mapped[str] = mapped_column(
        String(16), nullable=False, default="en", server_default=text("'en'")
    )
    total_text_length: Mapped[int] = mapped_column(
        Integer, nullable=False, default=0, server_default=text("0")
    )
    source_metadata: Mapped[dict | list | None] = mapped_column(JSON, nullable=True)
    ontology: Mapped[dict | list | None] = mapped_column(JSON, nullable=True)
    analysis_summary: Mapped[str | None] = mapped_column(Text, nullable=True)
    simulation_requirement: Mapped[str | None] = mapped_column(Text, nullable=True)
    graph_id: Mapped[str | None] = mapped_column(String(128), nullable=True, index=True)
    graph_build_task_id: Mapped[str | None] = mapped_column(String(128), nullable=True)
    error: Mapped[str | None] = mapped_column(Text, nullable=True)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, default=_utc_now, server_default=func.now()
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, default=_utc_now, server_default=func.now(), onupdate=_utc_now
    )


class ProductSimulation(Base):
    """Durable, tenant-scoped simulation with a config snapshot."""

    __tablename__ = "simulations"
    __table_args__ = (
        Index("ix_simulations_org_project", "organization_id", "project_id"),
        Index("ix_simulations_org_created", "organization_id", "created_at"),
    )

    id: Mapped[str] = mapped_column(
        String(128), primary_key=True, default=lambda: _id("sim")
    )
    organization_id: Mapped[str] = mapped_column(
        ForeignKey("organizations.id", ondelete="CASCADE"), nullable=False, index=True
    )
    project_id: Mapped[str] = mapped_column(
        ForeignKey("projects.id", ondelete="CASCADE"), nullable=False, index=True
    )
    created_by_user_id: Mapped[str | None] = mapped_column(
        ForeignKey("users.id", ondelete="SET NULL"), nullable=True
    )
    status: Mapped[str] = mapped_column(
        String(32), nullable=False, default=SimulationStatus.CREATED.value, server_default=text("'created'")
    )
    platform: Mapped[str] = mapped_column(
        String(32), nullable=False, default="parallel", server_default=text("'parallel'")
    )
    config: Mapped[dict | list | None] = mapped_column(JSON, nullable=True)
    current_round: Mapped[int] = mapped_column(Integer, nullable=False, default=0, server_default=text("0"))
    error: Mapped[str | None] = mapped_column(Text, nullable=True)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, default=_utc_now, server_default=func.now()
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, default=_utc_now, server_default=func.now(), onupdate=_utc_now
    )
    finished_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)


class DurableReport(Base):
    """Durable, tenant-scoped report with outline/status/content metadata."""

    __tablename__ = "reports"
    __table_args__ = (
        UniqueConstraint("organization_id", "id", name="uq_reports_org_id"),
        Index("ix_reports_org_project", "organization_id", "project_id"),
        Index("ix_reports_org_simulation", "organization_id", "simulation_id"),
        Index("ix_reports_org_created", "organization_id", "created_at"),
    )

    id: Mapped[str] = mapped_column(
        String(128), primary_key=True, default=lambda: _id("report")
    )
    organization_id: Mapped[str] = mapped_column(
        ForeignKey("organizations.id", ondelete="CASCADE"), nullable=False, index=True
    )
    project_id: Mapped[str] = mapped_column(
        ForeignKey("projects.id", ondelete="CASCADE"), nullable=False, index=True
    )
    simulation_id: Mapped[str | None] = mapped_column(
        ForeignKey("simulations.id", ondelete="SET NULL"), nullable=True, index=True
    )
    created_by_user_id: Mapped[str | None] = mapped_column(
        ForeignKey("users.id", ondelete="SET NULL"), nullable=True
    )
    status: Mapped[str] = mapped_column(
        String(32), nullable=False, default=ReportStatus.DRAFT.value, server_default=text("'draft'")
    )
    title: Mapped[str] = mapped_column(String(255), nullable=False, server_default=text("''"))
    outline: Mapped[dict | list | None] = mapped_column(JSON, nullable=True)
    markdown_content: Mapped[str | None] = mapped_column(Text, nullable=True)
    error: Mapped[str | None] = mapped_column(Text, nullable=True)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, default=_utc_now, server_default=func.now()
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, default=_utc_now, server_default=func.now(), onupdate=_utc_now
    )
    finished_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)