from typing import Any

import uuid
from datetime import datetime, timezone

from sqlalchemy import DateTime, JSON, func
from sqlalchemy.ext.asyncio import AsyncSession
from sqlmodel import Field, SQLModel, select


def _now() -> datetime:
    return datetime.now(timezone.utc)


class OrgSettings(SQLModel, table=True):
    __tablename__ = "org_settings"

    id: uuid.UUID = Field(default_factory=uuid.uuid4, primary_key=True)
    setting_key: str = Field(unique=True, index=True)
    setting_value: Any = Field(sa_type=JSON)
    category: str
    updated_by: uuid.UUID | None = Field(default=None, foreign_key="users.id")
    created_at: datetime = Field(default_factory=_now, sa_type=DateTime(timezone=True))
    updated_at: datetime = Field(default_factory=_now, sa_type=DateTime(timezone=True))

    @staticmethod
    def _as_uuid(record_id) -> uuid.UUID | None:
        if record_id in (None, ""):
            return None
        try:
            return uuid.UUID(str(record_id))
        except ValueError:
            return None

    @classmethod
    async def fetch_settings(cls, session: AsyncSession, *, category: str | None = None):
        statement = select(cls)
        if category:
            statement = statement.where(cls.category == category)
        statement = statement.order_by(cls.setting_key.asc())
        result = await session.execute(statement)
        rows = list(result.scalars().all())
        return rows, len(rows)

    @classmethod
    async def get_by_key(cls, session: AsyncSession, setting_key: str):
        result = await session.execute(select(cls).where(cls.setting_key == setting_key))
        return result.scalars().first()

    @classmethod
    async def upsert_settings(cls, session: AsyncSession, items: list[dict], updated_by):
        rows = []
        now = _now()
        for item in items:
            key = item["setting_key"]
            row = await cls.get_by_key(session, key)
            if row is None:
                row = cls(
                    setting_key=key,
                    setting_value=item.get("setting_value"),
                    category=item["category"],
                    updated_by=updated_by,
                    created_at=now,
                    updated_at=now,
                )
            else:
                row.setting_value = item.get("setting_value")
                row.category = item["category"]
                row.updated_by = updated_by
                row.updated_at = now
            session.add(row)
            rows.append(row)
        await session.commit()
        for row in rows:
            await session.refresh(row)
        return rows


class ExcludeUniversity(SQLModel, table=True):
    __tablename__ = "exclude_university"

    id: uuid.UUID = Field(default_factory=uuid.uuid4, primary_key=True)
    name: str = Field(index=True)
    created_by: uuid.UUID | None = Field(default=None, foreign_key="users.id")
    created_at: datetime = Field(default_factory=_now, sa_type=DateTime(timezone=True))
    updated_at: datetime = Field(default_factory=_now, sa_type=DateTime(timezone=True))
    is_deleted: bool = Field(default=False)

    @staticmethod
    def _as_uuid(record_id) -> uuid.UUID | None:
        if record_id in (None, ""):
            return None
        try:
            return uuid.UUID(str(record_id))
        except ValueError:
            return None

    @classmethod
    async def get_by_id(cls, session: AsyncSession, record_id):
        uid = cls._as_uuid(record_id)
        if uid is None:
            return None
        result = await session.execute(
            select(cls).where(cls.id == uid, cls.is_deleted == False)  # noqa: E712
        )
        return result.scalars().first()

    @classmethod
    async def get_by_name(cls, session: AsyncSession, name: str, *, exclude_id=None):
        cleaned = (name or "").strip()
        if not cleaned:
            return None
        statement = select(cls).where(
            func.lower(cls.name) == cleaned.lower(),
            cls.is_deleted == False,  # noqa: E712
        )
        if exclude_id is not None:
            uid = cls._as_uuid(exclude_id)
            if uid is not None:
                statement = statement.where(cls.id != uid)
        result = await session.execute(statement)
        return result.scalars().first()

    @classmethod
    async def fetch_rows(cls, session: AsyncSession):
        statement = select(cls).where(cls.is_deleted == False).order_by(cls.name.asc())  # noqa: E712
        result = await session.execute(statement)
        rows = list(result.scalars().all())
        return rows, len(rows)

    @classmethod
    async def fetch_names(cls, session: AsyncSession) -> list[str]:
        rows, _ = await cls.fetch_rows(session)
        return [r.name for r in rows if r.name]

    @classmethod
    async def insert_row(cls, session: AsyncSession, fields: dict):
        row = cls(**fields)
        session.add(row)
        await session.commit()
        return await cls.get_by_id(session, row.id)

    @classmethod
    async def update_row(cls, session: AsyncSession, record_id, fields: dict):
        row = await cls.get_by_id(session, record_id)
        if not row:
            return None
        for key, value in fields.items():
            setattr(row, key, value)
        row.updated_at = _now()
        session.add(row)
        await session.commit()
        await session.refresh(row)
        return row

    @classmethod
    async def soft_delete_row(cls, session: AsyncSession, record_id):
        row = await cls.get_by_id(session, record_id)
        if not row:
            return None
        row.is_deleted = True
        row.updated_at = _now()
        session.add(row)
        await session.commit()
        return row


class ExcludeCompany(SQLModel, table=True):
    __tablename__ = "exclude_company"

    id: uuid.UUID = Field(default_factory=uuid.uuid4, primary_key=True)
    name: str = Field(index=True)
    linkedin_url: str | None = Field(default=None)
    created_by: uuid.UUID | None = Field(default=None, foreign_key="users.id")
    created_at: datetime = Field(default_factory=_now, sa_type=DateTime(timezone=True))
    updated_at: datetime = Field(default_factory=_now, sa_type=DateTime(timezone=True))
    is_deleted: bool = Field(default=False)

    @staticmethod
    def _as_uuid(record_id) -> uuid.UUID | None:
        if record_id in (None, ""):
            return None
        try:
            return uuid.UUID(str(record_id))
        except ValueError:
            return None

    @classmethod
    async def get_by_id(cls, session: AsyncSession, record_id):
        uid = cls._as_uuid(record_id)
        if uid is None:
            return None
        result = await session.execute(
            select(cls).where(cls.id == uid, cls.is_deleted == False)  # noqa: E712
        )
        return result.scalars().first()

    @classmethod
    async def get_by_name(cls, session: AsyncSession, name: str, *, exclude_id=None):
        cleaned = (name or "").strip()
        if not cleaned:
            return None
        statement = select(cls).where(
            func.lower(cls.name) == cleaned.lower(),
            cls.is_deleted == False,  # noqa: E712
        )
        if exclude_id is not None:
            uid = cls._as_uuid(exclude_id)
            if uid is not None:
                statement = statement.where(cls.id != uid)
        result = await session.execute(statement)
        return result.scalars().first()

    @classmethod
    async def fetch_rows(cls, session: AsyncSession):
        statement = select(cls).where(cls.is_deleted == False).order_by(cls.name.asc())  # noqa: E712
        result = await session.execute(statement)
        rows = list(result.scalars().all())
        return rows, len(rows)

    @classmethod
    async def fetch_names(cls, session: AsyncSession) -> list[str]:
        rows, _ = await cls.fetch_rows(session)
        return [r.name for r in rows if r.name]

    @classmethod
    async def fetch_linkedin_urls(cls, session: AsyncSession) -> list[str]:
        rows, _ = await cls.fetch_rows(session)
        return [r.linkedin_url for r in rows if r.linkedin_url]

    @classmethod
    async def insert_row(cls, session: AsyncSession, fields: dict):
        row = cls(**fields)
        session.add(row)
        await session.commit()
        return await cls.get_by_id(session, row.id)

    @classmethod
    async def update_row(cls, session: AsyncSession, record_id, fields: dict):
        row = await cls.get_by_id(session, record_id)
        if not row:
            return None
        for key, value in fields.items():
            setattr(row, key, value)
        row.updated_at = _now()
        session.add(row)
        await session.commit()
        await session.refresh(row)
        return row

    @classmethod
    async def soft_delete_row(cls, session: AsyncSession, record_id):
        row = await cls.get_by_id(session, record_id)
        if not row:
            return None
        row.is_deleted = True
        row.updated_at = _now()
        session.add(row)
        await session.commit()
        return row


import users.models as _users_models  # noqa: E402, F401