import uuid
from collections.abc import AsyncIterator
from datetime import datetime
from typing import Any

from sqlalchemy import (
    JSON,
    BigInteger,
    Boolean,
    CheckConstraint,
    DateTime,
    ForeignKey,
    Index,
    Integer,
    String,
    Text,
    UniqueConstraint,
    func,
)
from sqlalchemy.dialects.postgresql import INET, UUID
from sqlalchemy.ext.asyncio import (
    AsyncEngine,
    AsyncSession,
    async_sessionmaker,
    create_async_engine,
)
from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column

SCHEMA = "han_app"


class Base(DeclarativeBase):
    type_annotation_map = {dict[str, Any]: JSON}


class Common:
    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    record_status: Mapped[str] = mapped_column(String(1), default="A", server_default="A")
    status_changed_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
    status_change_reason: Mapped[str | None] = mapped_column(String(255))
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), onupdate=func.now()
    )
    updater_user_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True))


class UserIdentity(Common, Base):
    __tablename__ = "user_identities"
    __table_args__ = (Index("ix_user_identities_phone", "phone_number"), {"schema": SCHEMA})
    keycloak_sub: Mapped[str] = mapped_column(String(255), unique=True)
    phone_number: Mapped[str] = mapped_column(String(32))
    last_login_at: Mapped[datetime] = mapped_column(DateTime(timezone=True))


class ClientProfile(Common, Base):
    __tablename__ = "client_profiles"
    __table_args__ = ({"schema": SCHEMA},)
    user_id: Mapped[uuid.UUID] = mapped_column(
        ForeignKey(f"{SCHEMA}.user_identities.id", ondelete="RESTRICT"), unique=True
    )
    bitrix_contact_id: Mapped[str | None] = mapped_column(String(64))
    full_name: Mapped[str | None] = mapped_column(String(255))
    citizenship: Mapped[str | None] = mapped_column(String(128))
    russian_phone: Mapped[str | None] = mapped_column(String(32))
    foreign_phone: Mapped[str | None] = mapped_column(String(32))
    email: Mapped[str | None] = mapped_column(String(320))
    source_updated_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))


class UserConsent(Common, Base):
    __tablename__ = "user_consents"
    __table_args__ = (
        UniqueConstraint("user_id", "consent_type", "document_version"),
        CheckConstraint("consent_type IN ('personal_data','user_agreement','marketing')"),
        {"schema": SCHEMA},
    )
    user_id: Mapped[uuid.UUID] = mapped_column(
        ForeignKey(f"{SCHEMA}.user_identities.id", ondelete="RESTRICT")
    )
    ux_session_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True))
    consent_type: Mapped[str] = mapped_column(String(32))
    document_version: Mapped[str] = mapped_column(String(64))
    accepted: Mapped[bool] = mapped_column(Boolean)
    accepted_at: Mapped[datetime] = mapped_column(DateTime(timezone=True))
    client_ip: Mapped[str | None] = mapped_column(INET)
    user_agent_hash: Mapped[str | None] = mapped_column(String(64))


class UxSession(Common, Base):
    __tablename__ = "ux_sessions"
    __table_args__ = (
        CheckConstraint("start_reason IN ('first_launch','cold_start','idle_timeout')"),
        Index("ix_ux_sessions_user_started", "user_id", "started_at"),
        {"schema": SCHEMA},
    )
    user_id: Mapped[uuid.UUID] = mapped_column(
        ForeignKey(f"{SCHEMA}.user_identities.id", ondelete="RESTRICT")
    )
    start_reason: Mapped[str] = mapped_column(String(32))
    platform: Mapped[str] = mapped_column(String(32))
    app_version: Mapped[str] = mapped_column(String(64))
    device_id_hash: Mapped[str | None] = mapped_column(String(64))
    started_at: Mapped[datetime] = mapped_column(DateTime(timezone=True))


class Dialog(Common, Base):
    __tablename__ = "dialogs"
    __table_args__ = (
        CheckConstraint("status IN ('open','waiting_for_company','waiting_for_client','closed')"),
        Index("ix_dialogs_user_updated", "user_id", "updated_at", "id"),
        {"schema": SCHEMA},
    )
    user_id: Mapped[uuid.UUID] = mapped_column(
        ForeignKey(f"{SCHEMA}.user_identities.id", ondelete="RESTRICT")
    )
    status: Mapped[str] = mapped_column(String(32), default="open")
    last_message_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
    closed_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))


class Message(Common, Base):
    __tablename__ = "messages"
    __table_args__ = (
        CheckConstraint("sender_type IN ('client','company')"),
        CheckConstraint("content_kind IN ('text','file')"),
        CheckConstraint("safety_status IN ('pending','allowed','blocked','needs_review')"),
        CheckConstraint(
            "delivery_status IN ('accepted','processing','delivered','rejected','failed')"
        ),
        Index("ix_messages_dialog_created", "dialog_id", "created_at", "id"),
        UniqueConstraint("dialog_id", "client_idempotency_key"),
        {"schema": SCHEMA},
    )
    dialog_id: Mapped[uuid.UUID] = mapped_column(
        ForeignKey(f"{SCHEMA}.dialogs.id", ondelete="RESTRICT")
    )
    sender_type: Mapped[str] = mapped_column(String(16))
    content_kind: Mapped[str] = mapped_column(String(16))
    text: Mapped[str] = mapped_column(Text, default="")
    safety_status: Mapped[str] = mapped_column(String(16))
    delivery_status: Mapped[str] = mapped_column(String(16))
    external_message_id: Mapped[str | None] = mapped_column(String(255))
    client_idempotency_key: Mapped[str | None] = mapped_column(String(128))
    occurred_at: Mapped[datetime] = mapped_column(DateTime(timezone=True))


class MessageAttachment(Common, Base):
    __tablename__ = "message_attachments"
    __table_args__ = (
        CheckConstraint("direction IN ('client_upload','company_inbound')"),
        CheckConstraint("scan_status IN ('pending','clean','infected','failed')"),
        CheckConstraint("size_bytes > 0"),
        {"schema": SCHEMA},
    )
    dialog_id: Mapped[uuid.UUID] = mapped_column(ForeignKey(f"{SCHEMA}.dialogs.id"))
    message_id: Mapped[uuid.UUID | None] = mapped_column(
        ForeignKey(f"{SCHEMA}.messages.id"), unique=True
    )
    owner_user_id: Mapped[uuid.UUID] = mapped_column(ForeignKey(f"{SCHEMA}.user_identities.id"))
    direction: Mapped[str] = mapped_column(String(32))
    original_file_name: Mapped[str] = mapped_column(String(255))
    safe_file_name: Mapped[str] = mapped_column(String(255))
    mime_type: Mapped[str] = mapped_column(String(128))
    size_bytes: Mapped[int] = mapped_column(BigInteger)
    checksum_sha256: Mapped[str | None] = mapped_column(String(64))
    scan_status: Mapped[str] = mapped_column(String(16), default="pending")
    storage_bucket: Mapped[str] = mapped_column(String(255))
    object_key: Mapped[str] = mapped_column(String(1024))
    quarantine_object_key: Mapped[str | None] = mapped_column(String(1024))
    upload_expires_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
    completed_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))


class Document(Common, Base):
    __tablename__ = "documents"
    __table_args__ = (UniqueConstraint("storage_bucket", "object_key"), {"schema": SCHEMA})
    user_id: Mapped[uuid.UUID] = mapped_column(ForeignKey(f"{SCHEMA}.user_identities.id"))
    name: Mapped[str] = mapped_column(String(255))
    mime_type: Mapped[str] = mapped_column(String(128))
    size_bytes: Mapped[int] = mapped_column(BigInteger)
    checksum_sha256: Mapped[str] = mapped_column(String(64))
    storage_bucket: Mapped[str] = mapped_column(String(255))
    object_key: Mapped[str] = mapped_column(String(1024))
    sent_at: Mapped[datetime] = mapped_column(DateTime(timezone=True))


class SafetyTask(Base):
    __tablename__ = "safety_tasks"
    __table_args__ = ({"schema": SCHEMA},)
    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    task_id: Mapped[str] = mapped_column(String(255), unique=True)
    message_id: Mapped[uuid.UUID] = mapped_column(ForeignKey(f"{SCHEMA}.messages.id"), unique=True)
    attachment_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True))
    quarantine_object_key: Mapped[str | None] = mapped_column(String(1024))
    status: Mapped[str] = mapped_column(String(16))
    deadline_at: Mapped[datetime] = mapped_column(DateTime(timezone=True))
    next_poll_at: Mapped[datetime] = mapped_column(DateTime(timezone=True))
    attempt_count: Mapped[int] = mapped_column(Integer, default=0)
    last_error_code: Mapped[str | None] = mapped_column(String(64))
    locked_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
    locked_by: Mapped[str | None] = mapped_column(String(128))
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())


class DeliveryOutbox(Base):
    __tablename__ = "delivery_outbox"
    __table_args__ = ({"schema": SCHEMA},)
    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    message_id: Mapped[uuid.UUID] = mapped_column(ForeignKey(f"{SCHEMA}.messages.id"), unique=True)
    external_chat_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True))
    payload_json: Mapped[dict[str, Any]] = mapped_column(JSON)
    status: Mapped[str] = mapped_column(String(16), default="pending")
    attempt_count: Mapped[int] = mapped_column(Integer, default=0)
    next_attempt_at: Mapped[datetime] = mapped_column(DateTime(timezone=True))
    last_error_code: Mapped[str | None] = mapped_column(String(64))
    locked_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
    locked_by: Mapped[str | None] = mapped_column(String(128))
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())


class IdempotencyRecord(Base):
    __tablename__ = "idempotency_records"
    __table_args__ = (
        UniqueConstraint("scope", "user_id", "idempotency_key"),
        {"schema": SCHEMA},
    )
    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    scope: Mapped[str] = mapped_column(String(128))
    user_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True))
    idempotency_key: Mapped[str] = mapped_column(String(128))
    request_fingerprint: Mapped[str] = mapped_column(String(64))
    status: Mapped[str] = mapped_column(String(16))
    response_status: Mapped[int | None] = mapped_column(Integer)
    response_body_json: Mapped[dict[str, Any] | None] = mapped_column(JSON)
    resource_type: Mapped[str | None] = mapped_column(String(64))
    resource_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True))
    expires_at: Mapped[datetime] = mapped_column(DateTime(timezone=True))
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())


class OpenLinesInboxReceipt(Base):
    __tablename__ = "openlines_inbox_receipts"
    __table_args__ = (
        UniqueConstraint("event_id"),
        UniqueConstraint("external_chat_id", "bitrix_message_id"),
        {"schema": SCHEMA},
    )
    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    event_id: Mapped[str] = mapped_column(String(255))
    external_chat_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True))
    bitrix_message_id: Mapped[str | None] = mapped_column(String(255))
    event_type: Mapped[str] = mapped_column(String(32))
    payload_fingerprint: Mapped[str] = mapped_column(String(64))
    status: Mapped[str] = mapped_column(String(16))
    message_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True))
    last_error_code: Mapped[str | None] = mapped_column(String(64))
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())


class AuditEvent(Base):
    __tablename__ = "audit_events"
    __table_args__ = ({"schema": SCHEMA},)
    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    event_type: Mapped[str] = mapped_column(String(128))
    actor_type: Mapped[str] = mapped_column(String(32))
    user_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True))
    ux_session_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True))
    request_id: Mapped[str] = mapped_column(String(64))
    trace_id: Mapped[str | None] = mapped_column(String(64))
    resource_type: Mapped[str | None] = mapped_column(String(64))
    resource_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True))
    ip: Mapped[str | None] = mapped_column(INET)
    user_agent_hash: Mapped[str | None] = mapped_column(String(64))
    outcome: Mapped[str] = mapped_column(String(32))
    metadata_json: Mapped[dict[str, Any]] = mapped_column(JSON, default=dict)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())


class AppSetting(Base):
    __tablename__ = "app_settings"
    __table_args__ = ({"schema": SCHEMA},)
    setting_key: Mapped[str] = mapped_column(String(255), primary_key=True)
    setting_value: Mapped[str] = mapped_column(Text)
    value_type: Mapped[str] = mapped_column(String(32))
    is_public: Mapped[bool] = mapped_column(Boolean, default=False)
    description: Mapped[str | None] = mapped_column(Text)
    record_status: Mapped[str] = mapped_column(String(1), default="A")
    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())


class TextResource(Common, Base):
    __tablename__ = "text_resources"
    __table_args__ = (
        UniqueConstraint("mnemonic", "locale"),
        {"schema": SCHEMA},
    )
    mnemonic: Mapped[str] = mapped_column(String(255))
    locale: Mapped[str] = mapped_column(String(16), default="ru")
    text_value: Mapped[str] = mapped_column(Text)
    sort_order: Mapped[int] = mapped_column(Integer, default=0)


class PopularQuestion(Common, Base):
    __tablename__ = "popular_questions"
    __table_args__ = (
        UniqueConstraint("mnemonic", "locale"),
        {"schema": SCHEMA},
    )
    mnemonic: Mapped[str] = mapped_column(String(255))
    locale: Mapped[str] = mapped_column(String(16), default="ru")
    question_text: Mapped[str] = mapped_column(Text)
    sort_order: Mapped[int] = mapped_column(Integer, default=0)


class SyncQueue(Base):
    __tablename__ = "sync_queue"
    __table_args__ = ({"schema": SCHEMA},)
    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    task_type: Mapped[str] = mapped_column(String(64))
    entity_type: Mapped[str] = mapped_column(String(64))
    entity_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True))
    dedup_key: Mapped[str] = mapped_column(String(255), unique=True)
    payload_json: Mapped[dict[str, Any]] = mapped_column(JSON)
    status: Mapped[str] = mapped_column(String(16), default="pending")
    attempt_count: Mapped[int] = mapped_column(Integer, default=0)
    next_attempt_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now()
    )
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())


class EntityExternalMapping(Base):
    __tablename__ = "entity_external_mapping"
    __table_args__ = (UniqueConstraint("entity_type", "entity_id"), {"schema": SCHEMA})
    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    entity_type: Mapped[str] = mapped_column(String(64))
    entity_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True))
    external_id: Mapped[str] = mapped_column(String(128))
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())


class Database:
    def __init__(self, url: str) -> None:
        self.engine: AsyncEngine = create_async_engine(url, pool_pre_ping=True)
        self.sessions = async_sessionmaker(self.engine, expire_on_commit=False)

    async def session(self) -> AsyncIterator[AsyncSession]:
        async with self.sessions() as session:
            yield session

    async def close(self) -> None:
        await self.engine.dispose()