"""Workspace models — UI/navigation context only.

Workspaces control which modules, menu items, calendar views, contact folders,
saved views, and dashboard widgets are visible to a user. They NEVER affect
RBAC, ABAC, entity permissions, owner/sharing rights, tenant memberships,
RLS policies, or actual data access rights.

See: docs/security_kernel.md for the permission intersection rule.
"""

from __future__ import annotations

import uuid
from datetime import datetime

from sqlalchemy import (
    Boolean,
    CheckConstraint,
    DateTime,
    ForeignKey,
    Index,
    Integer,
    String,
    UniqueConstraint,
    func,
    text,
)
from sqlalchemy.dialects.postgresql import JSONB
from sqlalchemy.dialects.postgresql import UUID as PGUUID
from sqlalchemy.orm import Mapped, mapped_column

from app.core.db import Base, TenantMixin
from app.models.owned_mixin import OwnedMixin


class Workspace(Base, TenantMixin, OwnedMixin):
    """A workspace is a UI/navigation context for a user.

    It defines which modules are visible, which dashboard widgets appear,
    and how the sidebar is configured. It does NOT affect data access rights.
    """

    __tablename__ = "workspaces"
    __table_args__ = (
        UniqueConstraint("tenant_id", "name", name="uq_workspaces_tenant_name"),
        # Only one default workspace per tenant
        Index(
            "uq_workspace_default_per_tenant",
            "tenant_id",
            unique=True,
            postgresql_where=text("is_default = true"),
        ),
        Index("ix_workspaces_tenant", "tenant_id"),
    )

    id: Mapped[uuid.UUID] = mapped_column(
        PGUUID(as_uuid=True), primary_key=True, default=uuid.uuid4
    )
    name: Mapped[str] = mapped_column(String(100), nullable=False)
    icon: Mapped[str] = mapped_column(String(50), nullable=False, default="LayoutGrid")
    description: Mapped[str | None] = mapped_column(String(500), nullable=True)
    is_default: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
    is_active: Mapped[bool] = mapped_column(Boolean, nullable=False, default=True)
    created_by: Mapped[uuid.UUID | None] = mapped_column(
        PGUUID(as_uuid=True), ForeignKey("users.id", ondelete="SET NULL"), nullable=True
    )
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now()
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now(),
        onupdate=func.now(),
    )


class WorkspaceModule(Base, TenantMixin):
    """Which modules are visible in a workspace and their configuration."""

    __tablename__ = "workspace_modules"
    __table_args__ = (
        UniqueConstraint(
            "tenant_id", "workspace_id", "module_key", name="uq_wm_tenant_workspace_module"
        ),
        Index("ix_wm_workspace", "tenant_id", "workspace_id", "menu_order"),
    )

    id: Mapped[uuid.UUID] = mapped_column(
        PGUUID(as_uuid=True), primary_key=True, default=uuid.uuid4
    )
    workspace_id: Mapped[uuid.UUID] = mapped_column(
        PGUUID(as_uuid=True),
        ForeignKey("workspaces.id", ondelete="CASCADE"),
        nullable=False,
    )
    module_key: Mapped[str] = mapped_column(String(100), nullable=False)
    is_visible: Mapped[bool] = mapped_column(Boolean, nullable=False, default=True)
    menu_order: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    config: Mapped[dict] = mapped_column(JSONB, nullable=False, default=dict)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now()
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now(),
        onupdate=func.now(),
    )


class WorkspaceUser(Base, TenantMixin):
    """User assignment to a workspace with role (member or manager)."""

    __tablename__ = "workspace_users"
    __table_args__ = (
        UniqueConstraint(
            "tenant_id", "workspace_id", "user_id", name="uq_wu_tenant_workspace_user"
        ),
        CheckConstraint("role IN ('member', 'manager')", name="ck_wu_role"),
        Index("ix_wu_workspace", "tenant_id", "workspace_id"),
        Index("ix_wu_user", "tenant_id", "user_id"),
    )

    id: Mapped[uuid.UUID] = mapped_column(
        PGUUID(as_uuid=True), primary_key=True, default=uuid.uuid4
    )
    workspace_id: Mapped[uuid.UUID] = mapped_column(
        PGUUID(as_uuid=True),
        ForeignKey("workspaces.id", ondelete="CASCADE"),
        nullable=False,
    )
    user_id: Mapped[uuid.UUID] = mapped_column(
        PGUUID(as_uuid=True),
        ForeignKey("users.id", ondelete="CASCADE"),
        nullable=False,
    )
    role: Mapped[str] = mapped_column(String(20), nullable=False, default="member")
    is_default: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
    assigned_by: Mapped[uuid.UUID | None] = mapped_column(
        PGUUID(as_uuid=True), ForeignKey("users.id", ondelete="SET NULL"), nullable=True
    )
    assigned_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now()
    )


class WorkspaceWidget(Base, TenantMixin):
    """Dashboard widget configuration per workspace.

    Multiple instances of the same widget type can exist in the same workspace.
    No UNIQUE constraint on (workspace_id, widget_key) — allows duplicates.
    """

    __tablename__ = "workspace_widgets"
    __table_args__ = (
        Index("ix_ww_workspace", "tenant_id", "workspace_id"),
    )

    id: Mapped[uuid.UUID] = mapped_column(
        PGUUID(as_uuid=True), primary_key=True, default=uuid.uuid4
    )
    workspace_id: Mapped[uuid.UUID] = mapped_column(
        PGUUID(as_uuid=True),
        ForeignKey("workspaces.id", ondelete="CASCADE"),
        nullable=False,
    )
    widget_key: Mapped[str] = mapped_column(String(100), nullable=False)
    position_x: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    position_y: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    width: Mapped[int] = mapped_column(Integer, nullable=False, default=1)
    height: Mapped[int] = mapped_column(Integer, nullable=False, default=1)
    config: Mapped[dict] = mapped_column(JSONB, nullable=False, default=dict)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now()
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now(),
        onupdate=func.now(),
    )