"""
Manager Rules Routes
Manager settings, closing days, guarantees, and exclusions

Key concept: Managers own parking spots and set rules for their managed users.
Rules are set at manager level (users have manager_id pointing to their manager).
"""
from datetime import datetime
from fastapi import APIRouter, Depends, HTTPException
from pydantic import BaseModel
from sqlalchemy.orm import Session
import uuid

from database.connection import get_db
from database.models import (
    User,
    ManagerClosingDay, ManagerWeeklyClosingDay,
    ParkingGuarantee, ParkingExclusion
)
from utils.auth_middleware import require_admin, require_manager_or_admin, get_current_user

router = APIRouter(prefix="/api/managers", tags=["managers"])


# Request/Response Models
class ClosingDayCreate(BaseModel):
    date: str  # YYYY-MM-DD
    reason: str | None = None


class WeeklyClosingDayCreate(BaseModel):
    weekday: int  # 0=Sunday, 1=Monday, ..., 6=Saturday


class GuaranteeCreate(BaseModel):
    user_id: str
    start_date: str | None = None
    end_date: str | None = None


class ExclusionCreate(BaseModel):
    user_id: str
    start_date: str | None = None
    end_date: str | None = None


class ManagerSettingsUpdate(BaseModel):
    parking_quota: int | None = None
    spot_prefix: str | None = None


# Manager listing and details
@router.get("")
def list_managers(db: Session = Depends(get_db), user=Depends(require_manager_or_admin)):
    """Get all managers with their managed user count and parking quota"""
    managers = db.query(User).filter(User.role == "manager").all()
    result = []

    for manager in managers:
        managed_user_count = db.query(User).filter(User.manager_id == manager.id).count()

        result.append({
            "id": manager.id,
            "name": manager.name,
            "email": manager.email,
            "parking_quota": manager.manager_parking_quota or 0,
            "spot_prefix": manager.manager_spot_prefix,
            "managed_user_count": managed_user_count
        })

    return result


@router.get("/{manager_id}")
def get_manager_details(manager_id: str, db: Session = Depends(get_db), user=Depends(require_manager_or_admin)):
    """Get manager details including managed users and parking settings"""
    manager = db.query(User).filter(User.id == manager_id, User.role == "manager").first()
    if not manager:
        raise HTTPException(status_code=404, detail="Manager not found")

    managed_user_count = db.query(User).filter(User.manager_id == manager_id).count()

    return {
        "id": manager.id,
        "name": manager.name,
        "email": manager.email,
        "parking_quota": manager.manager_parking_quota or 0,
        "spot_prefix": manager.manager_spot_prefix,
        "managed_user_count": managed_user_count
    }


@router.put("/{manager_id}/settings")
def update_manager_settings(manager_id: str, data: ManagerSettingsUpdate, db: Session = Depends(get_db), user=Depends(require_admin)):
    """Update manager parking settings (admin only)"""
    manager = db.query(User).filter(User.id == manager_id, User.role == "manager").first()
    if not manager:
        raise HTTPException(status_code=404, detail="Manager not found")

    if data.parking_quota is not None:
        if data.parking_quota < 0:
            raise HTTPException(status_code=400, detail="Parking quota must be non-negative")
        manager.manager_parking_quota = data.parking_quota

    if data.spot_prefix is not None:
        if data.spot_prefix and not data.spot_prefix.isalpha():
            raise HTTPException(status_code=400, detail="Spot prefix must be a letter")
        if data.spot_prefix:
            data.spot_prefix = data.spot_prefix.upper()
        existing = db.query(User).filter(
            User.manager_spot_prefix == data.spot_prefix,
            User.id != manager_id
        ).first()
        if existing:
            raise HTTPException(status_code=400, detail=f"Spot prefix '{data.spot_prefix}' is already used")
        manager.manager_spot_prefix = data.spot_prefix

    manager.updated_at = datetime.utcnow().isoformat()
    db.commit()

    return {
        "id": manager.id,
        "parking_quota": manager.manager_parking_quota,
        "spot_prefix": manager.manager_spot_prefix
    }


@router.get("/{manager_id}/users")
def get_manager_users(manager_id: str, db: Session = Depends(get_db), user=Depends(require_manager_or_admin)):
    """Get all users in a manager's team (including the manager themselves)"""
    manager = db.query(User).filter(User.id == manager_id, User.role == "manager").first()
    if not manager:
        raise HTTPException(status_code=404, detail="Manager not found")

    # Include users managed by this manager + the manager themselves
    users = db.query(User).filter(
        (User.manager_id == manager_id) | (User.id == manager_id)
    ).all()
    return [{"id": u.id, "name": u.name, "email": u.email, "role": u.role} for u in users]


# Closing days
@router.get("/{manager_id}/closing-days")
def get_manager_closing_days(manager_id: str, db: Session = Depends(get_db), user=Depends(get_current_user)):
    """Get closing days for a manager"""
    days = db.query(ManagerClosingDay).filter(
        ManagerClosingDay.manager_id == manager_id
    ).order_by(ManagerClosingDay.date).all()
    return [{"id": d.id, "date": d.date, "reason": d.reason} for d in days]


@router.post("/{manager_id}/closing-days")
def add_manager_closing_day(manager_id: str, data: ClosingDayCreate, db: Session = Depends(get_db), user=Depends(require_manager_or_admin)):
    """Add a closing day for a manager"""
    manager = db.query(User).filter(User.id == manager_id, User.role == "manager").first()
    if not manager:
        raise HTTPException(status_code=404, detail="Manager not found")

    existing = db.query(ManagerClosingDay).filter(
        ManagerClosingDay.manager_id == manager_id,
        ManagerClosingDay.date == data.date
    ).first()
    if existing:
        raise HTTPException(status_code=400, detail="Closing day already exists for this date")

    closing_day = ManagerClosingDay(
        id=str(uuid.uuid4()),
        manager_id=manager_id,
        date=data.date,
        reason=data.reason
    )
    db.add(closing_day)
    db.commit()
    return {"id": closing_day.id, "message": "Closing day added"}


@router.delete("/{manager_id}/closing-days/{closing_day_id}")
def remove_manager_closing_day(manager_id: str, closing_day_id: str, db: Session = Depends(get_db), user=Depends(require_manager_or_admin)):
    """Remove a closing day for a manager"""
    closing_day = db.query(ManagerClosingDay).filter(
        ManagerClosingDay.id == closing_day_id,
        ManagerClosingDay.manager_id == manager_id
    ).first()
    if not closing_day:
        raise HTTPException(status_code=404, detail="Closing day not found")

    db.delete(closing_day)
    db.commit()
    return {"message": "Closing day removed"}


# Weekly closing days
@router.get("/{manager_id}/weekly-closing-days")
def get_manager_weekly_closing_days(manager_id: str, db: Session = Depends(get_db), user=Depends(get_current_user)):
    """Get weekly closing days for a manager"""
    days = db.query(ManagerWeeklyClosingDay).filter(
        ManagerWeeklyClosingDay.manager_id == manager_id
    ).all()
    return [{"id": d.id, "weekday": d.weekday} for d in days]


@router.post("/{manager_id}/weekly-closing-days")
def add_manager_weekly_closing_day(manager_id: str, data: WeeklyClosingDayCreate, db: Session = Depends(get_db), user=Depends(require_manager_or_admin)):
    """Add a weekly closing day for a manager"""
    manager = db.query(User).filter(User.id == manager_id, User.role == "manager").first()
    if not manager:
        raise HTTPException(status_code=404, detail="Manager not found")

    if data.weekday < 0 or data.weekday > 6:
        raise HTTPException(status_code=400, detail="Weekday must be 0-6 (0=Sunday, 6=Saturday)")

    existing = db.query(ManagerWeeklyClosingDay).filter(
        ManagerWeeklyClosingDay.manager_id == manager_id,
        ManagerWeeklyClosingDay.weekday == data.weekday
    ).first()
    if existing:
        raise HTTPException(status_code=400, detail="Weekly closing day already exists for this weekday")

    weekly_closing = ManagerWeeklyClosingDay(
        id=str(uuid.uuid4()),
        manager_id=manager_id,
        weekday=data.weekday
    )
    db.add(weekly_closing)
    db.commit()
    return {"id": weekly_closing.id, "message": "Weekly closing day added"}


@router.delete("/{manager_id}/weekly-closing-days/{weekly_id}")
def remove_manager_weekly_closing_day(manager_id: str, weekly_id: str, db: Session = Depends(get_db), user=Depends(require_manager_or_admin)):
    """Remove a weekly closing day for a manager"""
    weekly_closing = db.query(ManagerWeeklyClosingDay).filter(
        ManagerWeeklyClosingDay.id == weekly_id,
        ManagerWeeklyClosingDay.manager_id == manager_id
    ).first()
    if not weekly_closing:
        raise HTTPException(status_code=404, detail="Weekly closing day not found")

    db.delete(weekly_closing)
    db.commit()
    return {"message": "Weekly closing day removed"}


# Guarantees
@router.get("/{manager_id}/guarantees")
def get_manager_guarantees(manager_id: str, db: Session = Depends(get_db), user=Depends(require_manager_or_admin)):
    """Get parking guarantees for a manager"""
    guarantees = db.query(ParkingGuarantee).filter(ParkingGuarantee.manager_id == manager_id).all()
    result = []
    for g in guarantees:
        target_user = db.query(User).filter(User.id == g.user_id).first()
        result.append({
            "id": g.id,
            "user_id": g.user_id,
            "user_name": target_user.name if target_user else None,
            "start_date": g.start_date,
            "end_date": g.end_date
        })
    return result


@router.post("/{manager_id}/guarantees")
def add_manager_guarantee(manager_id: str, data: GuaranteeCreate, db: Session = Depends(get_db), user=Depends(require_manager_or_admin)):
    """Add parking guarantee for a manager"""
    manager = db.query(User).filter(User.id == manager_id, User.role == "manager").first()
    if not manager:
        raise HTTPException(status_code=404, detail="Manager not found")
    if not db.query(User).filter(User.id == data.user_id).first():
        raise HTTPException(status_code=404, detail="User not found")

    existing = db.query(ParkingGuarantee).filter(
        ParkingGuarantee.manager_id == manager_id,
        ParkingGuarantee.user_id == data.user_id
    ).first()
    if existing:
        raise HTTPException(status_code=400, detail="User already has a parking guarantee")

    guarantee = ParkingGuarantee(
        id=str(uuid.uuid4()),
        manager_id=manager_id,
        user_id=data.user_id,
        start_date=data.start_date,
        end_date=data.end_date,
        created_at=datetime.utcnow().isoformat()
    )
    db.add(guarantee)
    db.commit()
    return {"id": guarantee.id, "message": "Guarantee added"}


@router.delete("/{manager_id}/guarantees/{guarantee_id}")
def remove_manager_guarantee(manager_id: str, guarantee_id: str, db: Session = Depends(get_db), user=Depends(require_manager_or_admin)):
    """Remove parking guarantee for a manager"""
    guarantee = db.query(ParkingGuarantee).filter(
        ParkingGuarantee.id == guarantee_id,
        ParkingGuarantee.manager_id == manager_id
    ).first()
    if not guarantee:
        raise HTTPException(status_code=404, detail="Guarantee not found")

    db.delete(guarantee)
    db.commit()
    return {"message": "Guarantee removed"}


# Exclusions
@router.get("/{manager_id}/exclusions")
def get_manager_exclusions(manager_id: str, db: Session = Depends(get_db), user=Depends(require_manager_or_admin)):
    """Get parking exclusions for a manager"""
    exclusions = db.query(ParkingExclusion).filter(ParkingExclusion.manager_id == manager_id).all()
    result = []
    for e in exclusions:
        target_user = db.query(User).filter(User.id == e.user_id).first()
        result.append({
            "id": e.id,
            "user_id": e.user_id,
            "user_name": target_user.name if target_user else None,
            "start_date": e.start_date,
            "end_date": e.end_date
        })
    return result


@router.post("/{manager_id}/exclusions")
def add_manager_exclusion(manager_id: str, data: ExclusionCreate, db: Session = Depends(get_db), user=Depends(require_manager_or_admin)):
    """Add parking exclusion for a manager"""
    manager = db.query(User).filter(User.id == manager_id, User.role == "manager").first()
    if not manager:
        raise HTTPException(status_code=404, detail="Manager not found")
    if not db.query(User).filter(User.id == data.user_id).first():
        raise HTTPException(status_code=404, detail="User not found")

    existing = db.query(ParkingExclusion).filter(
        ParkingExclusion.manager_id == manager_id,
        ParkingExclusion.user_id == data.user_id
    ).first()
    if existing:
        raise HTTPException(status_code=400, detail="User already has a parking exclusion")

    exclusion = ParkingExclusion(
        id=str(uuid.uuid4()),
        manager_id=manager_id,
        user_id=data.user_id,
        start_date=data.start_date,
        end_date=data.end_date,
        created_at=datetime.utcnow().isoformat()
    )
    db.add(exclusion)
    db.commit()
    return {"id": exclusion.id, "message": "Exclusion added"}


@router.delete("/{manager_id}/exclusions/{exclusion_id}")
def remove_manager_exclusion(manager_id: str, exclusion_id: str, db: Session = Depends(get_db), user=Depends(require_manager_or_admin)):
    """Remove parking exclusion for a manager"""
    exclusion = db.query(ParkingExclusion).filter(
        ParkingExclusion.id == exclusion_id,
        ParkingExclusion.manager_id == manager_id
    ).first()
    if not exclusion:
        raise HTTPException(status_code=404, detail="Exclusion not found")

    db.delete(exclusion)
    db.commit()
    return {"message": "Exclusion removed"}