"""Availability repositories — Phase 10.3."""
from __future__ import annotations

from typing import Sequence
from uuid import UUID

from sqlalchemy import func, select

from app.models.availability import (
    DriverAvailability,
    Shift,
    ShiftAssignment,
    WorkingZone,
)
from app.repositories.base import TenantBaseRepository
from app.specifications.availability import ShiftListSpec, WorkingZoneListSpec


class DriverAvailabilityRepository(TenantBaseRepository[DriverAvailability]):
    model = DriverAvailability

    async def get_for_driver(
        self, tenant_id: UUID, driver_id: UUID
    ) -> DriverAvailability | None:
        stmt = (
            select(self.model)
            .where(
                self.model.tenant_id == tenant_id,
                self.model.driver_id == driver_id,
                self.model.is_deleted.is_(False),
            )
            .order_by(self.model.updated_at.desc())
            .limit(1)
        )
        result = await self.session.execute(stmt)
        return result.scalar_one_or_none()


class ShiftRepository(TenantBaseRepository[Shift]):
    model = Shift

    async def get_by_code(self, tenant_id: UUID, code: str) -> Shift | None:
        stmt = select(self.model).where(
            self.model.tenant_id == tenant_id,
            self.model.code == code,
            self.model.is_deleted.is_(False),
        )
        result = await self.session.execute(stmt)
        return result.scalar_one_or_none()

    async def list_filtered(
        self,
        tenant_id: UUID,
        *,
        offset: int = 0,
        limit: int = 20,
        spec: ShiftListSpec | None = None,
    ) -> Sequence[Shift]:
        stmt = select(self.model).where(
            self.model.tenant_id == tenant_id,
            self.model.is_deleted.is_(False),
        )
        if spec is not None:
            stmt = spec.apply(stmt)
        else:
            stmt = stmt.order_by(self.model.starts_at.desc())
        stmt = stmt.offset(offset).limit(limit)
        result = await self.session.execute(stmt)
        return result.scalars().all()

    async def count_filtered(
        self, tenant_id: UUID, *, spec: ShiftListSpec | None = None
    ) -> int:
        stmt = select(func.count()).select_from(self.model).where(
            self.model.tenant_id == tenant_id,
            self.model.is_deleted.is_(False),
        )
        if spec is not None:
            clauses = spec.filter_clauses()
            if clauses:
                stmt = stmt.where(*clauses)
        result = await self.session.execute(stmt)
        return int(result.scalar_one())


class ShiftAssignmentRepository(TenantBaseRepository[ShiftAssignment]):
    model = ShiftAssignment

    async def list_for_shift(
        self, tenant_id: UUID, shift_id: UUID
    ) -> Sequence[ShiftAssignment]:
        stmt = select(self.model).where(
            self.model.tenant_id == tenant_id,
            self.model.shift_id == shift_id,
            self.model.is_deleted.is_(False),
        )
        result = await self.session.execute(stmt)
        return result.scalars().all()


class WorkingZoneRepository(TenantBaseRepository[WorkingZone]):
    model = WorkingZone

    async def get_by_code(self, tenant_id: UUID, code: str) -> WorkingZone | None:
        stmt = select(self.model).where(
            self.model.tenant_id == tenant_id,
            self.model.code == code,
            self.model.is_deleted.is_(False),
        )
        result = await self.session.execute(stmt)
        return result.scalar_one_or_none()

    async def list_filtered(
        self,
        tenant_id: UUID,
        *,
        offset: int = 0,
        limit: int = 20,
        spec: WorkingZoneListSpec | None = None,
    ) -> Sequence[WorkingZone]:
        stmt = select(self.model).where(
            self.model.tenant_id == tenant_id,
            self.model.is_deleted.is_(False),
        )
        if spec is not None:
            stmt = spec.apply(stmt)
        else:
            stmt = stmt.order_by(self.model.created_at.desc())
        stmt = stmt.offset(offset).limit(limit)
        result = await self.session.execute(stmt)
        return result.scalars().all()

    async def count_filtered(
        self, tenant_id: UUID, *, spec: WorkingZoneListSpec | None = None
    ) -> int:
        stmt = select(func.count()).select_from(self.model).where(
            self.model.tenant_id == tenant_id,
            self.model.is_deleted.is_(False),
        )
        if spec is not None:
            clauses = spec.filter_clauses()
            if clauses:
                stmt = stmt.where(*clauses)
        result = await self.session.execute(stmt)
        return int(result.scalar_one())