HR-ATS-Portal/backend/inbox/models.py

import uuid
from datetime import datetime
from typing import Any, Optional

from sqlalchemy import Column, func, or_
from sqlalchemy.dialects.postgresql import JSONB
from sqlalchemy.ext.asyncio import AsyncSession
from sqlmodel import Field, Relationship, SQLModel, select

from users.models import Users


class Inbox(SQLModel, table=True):
    __tablename__ = "inbox"

    id: int | None = Field(default=None, primary_key=True)
    user_id: uuid.UUID | None = Field(default=None, foreign_key="users.id")

    alert_id: uuid.UUID | None = Field(default=None, foreign_key="inbox_alerts.id")
    alerts: Optional["Inbox_Alerts"] = Relationship(back_populates="inbox")

    message_id: uuid.UUID | None = Field(default=None, foreign_key="inbox_messages.id")
    messages: Optional["Inbox_Messages"] = Relationship(back_populates="inbox")

    created_at: datetime = Field(default_factory=datetime.now)
    updated_at: datetime = Field(default_factory=datetime.now)
    # is_active: bool = Field(default=True)
    # is_deleted: bool = Field(default=False)
    # user: Users | None = Relationship(back_populates="inbox")


class Inbox_Alerts(SQLModel, table=True):
    __tablename__ = "inbox_alerts"

    id: uuid.UUID = Field(default_factory=uuid.uuid4, primary_key=True)
    alert_sender_name: str
    alert_sender_email: str
    is_read: bool = Field(default=False)
    recieve_time: datetime = Field(default_factory=datetime.now)

    inbox: list[Inbox] = Relationship(back_populates="alerts")


class Inbox_Messages(SQLModel, table=True):
    __tablename__ = "inbox_messages"

    id: uuid.UUID = Field(default_factory=uuid.uuid4, primary_key=True)
    message_id: str | None = Field(default=None, index=True, unique=True)
    full_email_response: dict[str, Any] | None = Field(
        default=None, sa_column=Column(JSONB)
    )
    message_subject: str
    message_body: str
    message_sent_time: str
    message_received_time: str
    message_from: str
    message_to: str
    message_cc: str | None = Field(default=None)
    message_bcc: str | None = Field(default=None)
    message_read: bool = Field(default=False)
    attachment: bool = Field(default=False)
    message_reply: str | None = Field(default=None)
    file_path: str | None = Field(default=None)

    inbox: list[Inbox] = Relationship(back_populates="messages")

    @staticmethod
    def _body_text(email_data: dict) -> str:
        body = email_data.get("body")
        if isinstance(body, dict):
            return body.get("content") or ""
        if isinstance(body, str):
            return body
        return email_data.get("bodyPreview") or ""

    @classmethod
    def _fields_from_email(cls, email_data: dict) -> dict:
        return {
            "message_subject": email_data.get("subject") or "",
            "message_body": cls._body_text(email_data),
            "message_sent_time": email_data.get("sentDateTime") or "",
            "message_read": bool(email_data.get("isRead")),
            "message_received_time": email_data.get("receivedDateTime") or "",
            "message_from": email_data.get("from", {})
            .get("emailAddress", {})
            .get("address", ""),
            "message_to": ",".join(
                [r["emailAddress"]["address"] for r in email_data.get("toRecipients", [])]
            ),
            "message_cc": ",".join(
                [r["emailAddress"]["address"] for r in email_data.get("ccRecipients", [])]
            ),
            "message_bcc": ",".join(
                [r["emailAddress"]["address"] for r in email_data.get("bccRecipients", [])]
            ),
            "attachment": bool(email_data.get("hasAttachments")),
            "message_reply": ",".join(
                [r["emailAddress"]["address"] for r in email_data.get("replyTo", [])]
            ),
            "message_id": email_data.get("id"),
            "full_email_response": email_data,
        }

    @classmethod
    async def insert_email(cls, session: AsyncSession, email_data: dict):
        fields = cls._fields_from_email(email_data)
        external_id = fields.get("message_id")

        if external_id:
            existing = (
                await session.execute(
                    select(cls).where(cls.message_id == external_id)
                )
            ).scalars().first()
            if existing:
                for key, value in fields.items():
                    setattr(existing, key, value)
                session.add(existing)
                await session.commit()
                await session.refresh(existing)
                return existing

        email = cls(**fields)
        session.add(email)
        await session.commit()
        return email

    @classmethod
    def _search_filter(cls, search: str):
        pattern = f"%{search}%"
        return or_(
            cls.message_subject.ilike(pattern),
            cls.message_from.ilike(pattern),
            cls.message_body.ilike(pattern),
        )

    @classmethod
    async def get_inbox_messages(
        cls, session: AsyncSession, top: int | None, skip: int, search: str | None
    ):
        statement = select(cls).order_by(cls.message_received_time.desc())
        if search:
            statement = statement.where(cls._search_filter(search))
        if skip:
            statement = statement.offset(skip)
        if top is not None:
            statement = statement.limit(top)
        result = await session.execute(statement)
        return result.scalars().all()

    @classmethod
    async def get_inbox_message_by_id(cls, session: AsyncSession, record_id: str):
        try:
            uid = uuid.UUID(str(record_id))
        except ValueError:
            return None
        result = await session.execute(select(cls).where(cls.id == uid))
        return result.scalars().first()

    @classmethod
    async def count_inbox_messages(cls, session: AsyncSession, search: str | None):
        statement = select(func.count()).select_from(cls)
        if search:
            statement = statement.where(cls._search_filter(search))
        result = await session.execute(statement)
        return result.scalar_one()