from __future__ import annotations

import uuid
from datetime import datetime
from typing import Any

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

from govoplan_core.db.base import Base, TimestampMixin


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


class SchedulingRequest(Base, TimestampMixin):
    __tablename__ = "scheduling_requests"
    __table_args__ = (
        Index("ix_scheduling_requests_tenant_status", "tenant_id", "status"),
        Index("ix_scheduling_requests_tenant_poll", "tenant_id", "poll_id"),
        Index("ix_scheduling_requests_deadline", "tenant_id", "deadline_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)
    title: Mapped[str] = mapped_column(String(500), nullable=False)
    description: Mapped[str | None] = mapped_column(Text)
    location: Mapped[str | None] = mapped_column(String(500))
    timezone: Mapped[str] = mapped_column(String(100), default="UTC", nullable=False)
    status: Mapped[str] = mapped_column(String(40), default="draft", nullable=False, index=True)
    poll_id: Mapped[str | None] = mapped_column(String(36), nullable=True, index=True)
    selected_slot_id: Mapped[str | None] = mapped_column(String(36), nullable=True, index=True)
    organizer_user_id: Mapped[str | None] = mapped_column(String(36), nullable=True, index=True)
    deadline_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True, index=True)
    allow_external_participants: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
    allow_participant_updates: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
    result_visibility: Mapped[str] = mapped_column(String(30), default="after_close", nullable=False)
    participant_visibility: Mapped[str] = mapped_column(String(32), default="aggregates_only", nullable=False)
    notify_on_answers: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
    single_choice: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
    max_participants_per_option: Mapped[int | None] = mapped_column(Integer, nullable=True)
    allow_maybe: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
    allow_comments: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
    participant_email_required: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
    anonymous_password_protection_enabled: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
    anonymous_password_hash: Mapped[str | None] = mapped_column(String(500), nullable=True)
    calendar_integration_enabled: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
    calendar_id: Mapped[str | None] = mapped_column(String(36), nullable=True, index=True)
    calendar_freebusy_enabled: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
    calendar_hold_enabled: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
    create_calendar_event_on_decision: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
    calendar_event_id: Mapped[str | None] = mapped_column(String(36), nullable=True, index=True)
    handed_off_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    cancelled_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    cancellation_notice_until: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    deleted_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True, index=True)
    metadata_: Mapped[dict[str, Any] | None] = mapped_column("metadata", JSON, nullable=True)

    slots: Mapped[list["SchedulingCandidateSlot"]] = relationship(
        back_populates="request",
        cascade="all, delete-orphan",
        order_by="SchedulingCandidateSlot.position",
    )
    participants: Mapped[list["SchedulingParticipant"]] = relationship(
        back_populates="request",
        cascade="all, delete-orphan",
        order_by="SchedulingParticipant.created_at",
    )


class SchedulingCandidateSlot(Base, TimestampMixin):
    __tablename__ = "scheduling_candidate_slots"
    __table_args__ = (
        Index("ix_scheduling_candidate_slots_request_position", "request_id", "position"),
        Index("ix_scheduling_candidate_slots_range", "tenant_id", "start_at", "end_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)
    request_id: Mapped[str] = mapped_column(ForeignKey("scheduling_requests.id", ondelete="CASCADE"), nullable=False, index=True)
    poll_option_id: Mapped[str | None] = mapped_column(String(36), nullable=True, index=True)
    label: Mapped[str] = mapped_column(String(500), nullable=False)
    description: Mapped[str | None] = mapped_column(Text)
    start_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False, index=True)
    end_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False, index=True)
    timezone: Mapped[str] = mapped_column(String(100), default="UTC", nullable=False)
    location: Mapped[str | None] = mapped_column(String(500))
    position: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
    freebusy_checked_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    freebusy_status: Mapped[str | None] = mapped_column(String(40), nullable=True, index=True)
    freebusy_conflicts: Mapped[list[dict[str, Any]]] = mapped_column(JSON, default=list, nullable=False)
    tentative_hold_event_id: Mapped[str | None] = mapped_column(String(36), nullable=True, index=True)
    deleted_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True, index=True)
    metadata_: Mapped[dict[str, Any] | None] = mapped_column("metadata", JSON, nullable=True)

    request: Mapped[SchedulingRequest] = relationship(back_populates="slots")


class SchedulingParticipant(Base, TimestampMixin):
    __tablename__ = "scheduling_participants"
    __table_args__ = (
        Index("ix_scheduling_participants_request", "tenant_id", "request_id"),
        Index("ix_scheduling_participants_request_email", "request_id", "email"),
        Index("ix_scheduling_participants_request_respondent", "request_id", "respondent_id"),
    )

    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)
    request_id: Mapped[str] = mapped_column(ForeignKey("scheduling_requests.id", ondelete="CASCADE"), nullable=False, index=True)
    respondent_id: Mapped[str | None] = mapped_column(String(255), nullable=True, index=True)
    display_name: Mapped[str | None] = mapped_column(String(500), nullable=True)
    email: Mapped[str | None] = mapped_column(String(320), nullable=True, index=True)
    participant_type: Mapped[str] = mapped_column(String(30), default="external", nullable=False, index=True)
    required: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
    status: Mapped[str] = mapped_column(String(40), default="invited", nullable=False, index=True)
    poll_invitation_id: Mapped[str | None] = mapped_column(String(36), nullable=True, index=True)
    participation_gateway: Mapped[str | None] = mapped_column(String(40), nullable=True)
    last_invited_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    responded_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    response_comment: Mapped[str | None] = mapped_column(Text, nullable=True)
    deleted_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True, index=True)
    metadata_: Mapped[dict[str, Any] | None] = mapped_column("metadata", JSON, nullable=True)

    request: Mapped[SchedulingRequest] = relationship(back_populates="participants")


class SchedulingNotification(Base, TimestampMixin):
    __tablename__ = "scheduling_notifications"
    __table_args__ = (
        Index("ix_scheduling_notifications_request_status", "request_id", "status"),
        Index("ix_scheduling_notifications_tenant_status", "tenant_id", "status"),
    )

    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)
    request_id: Mapped[str] = mapped_column(ForeignKey("scheduling_requests.id", ondelete="CASCADE"), nullable=False, index=True)
    participant_id: Mapped[str | None] = mapped_column(String(36), nullable=True, index=True)
    event_kind: Mapped[str] = mapped_column(String(40), nullable=False, index=True)
    channel: Mapped[str] = mapped_column(String(40), default="mail", nullable=False, index=True)
    recipient: Mapped[str | None] = mapped_column(String(500), nullable=True, index=True)
    status: Mapped[str] = mapped_column(String(40), default="pending", nullable=False, index=True)
    payload: Mapped[dict[str, Any]] = mapped_column(JSON, default=dict, nullable=False)
    error: Mapped[str | None] = mapped_column(Text)
    sent_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    metadata_: Mapped[dict[str, Any] | None] = mapped_column("metadata", JSON, nullable=True)


__all__ = [
    "SchedulingCandidateSlot",
    "SchedulingNotification",
    "SchedulingParticipant",
    "SchedulingRequest",
    "new_uuid",
]