from __future__ import annotations
from datetime import datetime, timezone
from sqlalchemy import DateTime, ForeignKey, Integer, String, Text, UniqueConstraint
from sqlalchemy.orm import Mapped, mapped_column
from app.core.db.common import CommonBase

class ClientPortalIdentity(CommonBase):
    __tablename__ = "client_portal_identities"
    __table_args__ = (
        UniqueConstraint("client_id", name="uq_client_portal_identity_client"),
        UniqueConstraint("tenant_id", "normalized_pan", name="uq_client_portal_identity_tenant_pan"),
    )
    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    tenant_id: Mapped[int] = mapped_column(ForeignKey("tenants.id", ondelete="CASCADE"), nullable=False, index=True)
    branch_id: Mapped[int] = mapped_column(ForeignKey("branches.id", ondelete="CASCADE"), nullable=False, index=True)
    client_id: Mapped[int] = mapped_column(ForeignKey("clients.id", ondelete="CASCADE"), nullable=False, index=True)
    user_id: Mapped[int | None] = mapped_column(ForeignKey("users.id", ondelete="SET NULL"), nullable=True, index=True)
    normalized_pan: Mapped[str] = mapped_column(String(10), nullable=False, index=True)
    login_email: Mapped[str] = mapped_column(String(255), nullable=False, index=True)
    email_is_placeholder: Mapped[bool] = mapped_column(default=False, nullable=False)
    status: Mapped[str] = mapped_column(String(30), nullable=False, default="not_invited", index=True)
    invited_at_utc: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    activated_at_utc: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    last_invited_at_utc: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    created_by_user_id: Mapped[int | None] = mapped_column(ForeignKey("users.id", ondelete="SET NULL"), nullable=True)
    updated_by_user_id: Mapped[int | None] = mapped_column(ForeignKey("users.id", ondelete="SET NULL"), nullable=True)
    created_at_utc: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=lambda: datetime.now(timezone.utc), nullable=False)
    updated_at_utc: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=lambda: datetime.now(timezone.utc), onupdate=lambda: datetime.now(timezone.utc), nullable=False)

class ClientPortalInvitation(CommonBase):
    __tablename__ = "client_portal_invitations"
    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    identity_id: Mapped[int] = mapped_column(ForeignKey("client_portal_identities.id", ondelete="CASCADE"), nullable=False, index=True)
    user_id: Mapped[int] = mapped_column(ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True)
    delivery_mode: Mapped[str] = mapped_column(String(30), nullable=False, default="email")
    recipient_email: Mapped[str | None] = mapped_column(String(255), nullable=True)
    status: Mapped[str] = mapped_column(String(30), nullable=False, default="issued", index=True)
    issued_by_user_id: Mapped[int | None] = mapped_column(ForeignKey("users.id", ondelete="SET NULL"), nullable=True)
    issued_at_utc: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=lambda: datetime.now(timezone.utc), nullable=False)
    expires_at_utc: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    accepted_at_utc: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    note: Mapped[str | None] = mapped_column(Text, nullable=True)

class ClientIdentityAuditLog(CommonBase):
    __tablename__ = "client_identity_audit_logs"
    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    tenant_id: Mapped[int] = mapped_column(ForeignKey("tenants.id", ondelete="CASCADE"), nullable=False, index=True)
    client_id: Mapped[int] = mapped_column(ForeignKey("clients.id", ondelete="CASCADE"), nullable=False, index=True)
    identity_id: Mapped[int | None] = mapped_column(ForeignKey("client_portal_identities.id", ondelete="SET NULL"), nullable=True, index=True)
    actor_user_id: Mapped[int | None] = mapped_column(ForeignKey("users.id", ondelete="SET NULL"), nullable=True)
    action: Mapped[str] = mapped_column(String(50), nullable=False, index=True)
    summary: Mapped[str] = mapped_column(String(255), nullable=False)
    created_at_utc: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=lambda: datetime.now(timezone.utc), nullable=False)