from __future__ import annotations

from datetime import datetime
from typing import Any
import uuid

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

from govoplan_core.db.base import Base, TimestampMixin


def new_uuid() -> str:
    return str(uuid.uuid4())


class CommitteeWorkspaceRevision(Base, TimestampMixin):
    __tablename__ = "committee_workspace_revisions"
    __table_args__ = (
        UniqueConstraint(
            "tenant_id",
            "object_kind",
            "object_id",
            "revision",
            name="uq_committee_workspace_revision",
        ),
        Index(
            "ix_committee_workspace_current",
            "tenant_id",
            "object_kind",
            "object_id",
            "superseded_at",
        ),
        Index(
            "ix_committee_workspace_parent",
            "tenant_id",
            "parent_kind",
            "parent_id",
            "object_kind",
            "state",
        ),
    )

    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=new_uuid)
    tenant_id: Mapped[str] = mapped_column(String(36), nullable=False, index=True)
    object_kind: Mapped[str] = mapped_column(String(30), nullable=False, index=True)
    object_id: Mapped[str] = mapped_column(String(255), nullable=False, index=True)
    revision: Mapped[int] = mapped_column(Integer, nullable=False)
    previous_revision_id: Mapped[str | None] = mapped_column(
        ForeignKey("committee_workspace_revisions.id", ondelete="RESTRICT"),
        nullable=True,
        index=True,
    )
    parent_kind: Mapped[str | None] = mapped_column(String(30), nullable=True, index=True)
    parent_id: Mapped[str | None] = mapped_column(String(255), nullable=True, index=True)
    state: Mapped[str] = mapped_column(String(30), nullable=False, index=True)
    title: Mapped[str] = mapped_column(String(500), nullable=False)
    search_text: Mapped[str] = mapped_column(Text, nullable=False)
    recorded_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False, index=True)
    superseded_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True, index=True)
    payload: Mapped[dict[str, Any]] = mapped_column(JSON, nullable=False)
    changed_by: Mapped[str | None] = mapped_column(String(255), nullable=True, index=True)


class CommitteeWorkspaceEvent(Base, TimestampMixin):
    __tablename__ = "committee_workspace_events"
    __table_args__ = (
        UniqueConstraint("tenant_id", "event_id", name="uq_committee_workspace_event"),
        UniqueConstraint("tenant_id", "idempotency_key", name="uq_committee_workspace_idempotency"),
        Index(
            "ix_committee_workspace_event_object",
            "tenant_id",
            "object_kind",
            "object_id",
            "occurred_at",
        ),
    )

    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=new_uuid)
    tenant_id: Mapped[str] = mapped_column(String(36), nullable=False, index=True)
    object_kind: Mapped[str] = mapped_column(String(30), nullable=False, index=True)
    object_id: Mapped[str] = mapped_column(String(255), nullable=False, index=True)
    object_revision: Mapped[int] = mapped_column(Integer, nullable=False)
    event_id: Mapped[str] = mapped_column(String(36), nullable=False, index=True)
    event_type: Mapped[str] = mapped_column(String(120), nullable=False, index=True)
    occurred_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False, index=True)
    actor_id: Mapped[str | None] = mapped_column(String(255), nullable=True, index=True)
    idempotency_key: Mapped[str] = mapped_column(String(255), nullable=False)
    request_sha256: Mapped[str] = mapped_column(String(64), nullable=False)
    payload: Mapped[dict[str, Any]] = mapped_column(JSON, default=dict, nullable=False)


class CommitteeDecisionProjection(Base, TimestampMixin):
    __tablename__ = "committee_decision_projections"
    __table_args__ = (
        UniqueConstraint(
            "tenant_id",
            "decision_id",
            "revision",
            name="uq_committee_decision_projection_revision",
        ),
        Index(
            "ix_committee_decision_projection_current",
            "tenant_id",
            "decision_id",
            "superseded_at",
        ),
    )

    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=new_uuid)
    tenant_id: Mapped[str] = mapped_column(String(36), nullable=False, index=True)
    decision_id: Mapped[str] = mapped_column(String(255), nullable=False, index=True)
    revision: Mapped[str] = mapped_column(String(120), nullable=False)
    previous_revision_id: Mapped[str | None] = mapped_column(
        ForeignKey("committee_decision_projections.id", ondelete="RESTRICT"),
        nullable=True,
        index=True,
    )
    meeting_id: Mapped[str] = mapped_column(String(255), nullable=False, index=True)
    agenda_item_id: Mapped[str] = mapped_column(String(255), nullable=False, index=True)
    state: Mapped[str] = mapped_column(String(30), nullable=False, index=True)
    recorded_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False, index=True)
    superseded_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True, index=True)
    payload: Mapped[dict[str, Any]] = mapped_column(JSON, nullable=False)
    changed_by: Mapped[str | None] = mapped_column(String(255), nullable=True, index=True)


__all__ = [
    "CommitteeDecisionProjection",
    "CommitteeWorkspaceEvent",
    "CommitteeWorkspaceRevision",
]