from __future__ import annotations
from datetime import datetime, timezone
from sqlalchemy import Boolean, DateTime, ForeignKey, Integer, String, Text
from sqlalchemy.orm import Mapped, mapped_column
from .base import Base


class Dashboard(Base):
    __tablename__ = "dashboards"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    name: Mapped[str] = mapped_column(String(128), nullable=False, default="Default")
    # NULL owner_id = system dashboard (visible to all, editable by admins)
    owner_id: Mapped[str | None] = mapped_column(
        String(36), ForeignKey("users.id", ondelete="SET NULL"), nullable=True, default=None,
    )
    is_default: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
    # is_shared = True → visible to all logged-in users (read-only to non-owners)
    is_shared: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False,
        default=lambda: datetime.now(timezone.utc),
    )


class DashboardShareToken(Base):
    __tablename__ = "dashboard_share_tokens"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    dashboard_id: Mapped[int] = mapped_column(
        Integer, ForeignKey("dashboards.id", ondelete="CASCADE"), nullable=False,
    )
    token_hash: Mapped[str] = mapped_column(String(64), nullable=False, unique=True)
    label: Mapped[str] = mapped_column(String(128), nullable=False, default="")
    expires_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    created_by: Mapped[str | None] = mapped_column(
        String(36), ForeignKey("users.id", ondelete="SET NULL"), nullable=True,
    )
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False,
        default=lambda: datetime.now(timezone.utc),
    )


class DashboardWidget(Base):
    __tablename__ = "dashboard_widgets"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    dashboard_id: Mapped[int] = mapped_column(
        Integer, ForeignKey("dashboards.id", ondelete="CASCADE"), nullable=False,
    )
    widget_key: Mapped[str] = mapped_column(String(64), nullable=False)
    position: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    title: Mapped[str | None] = mapped_column(String(128), nullable=True)
    config_json: Mapped[str | None] = mapped_column(Text, nullable=True)